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![liuyacan](/assets/img/avatar_default.png)
In the process of checking whether RDMAv2 is available, the current
implementation first sets ini->smcrv2.ib_dev_v2, and then allocates
smc buf desc and register rmb, but the latter may fail. In this case,
the pointer should be reset.
Fixes: e49300a6bf
("net/smc: add listen processing for SMC-Rv2")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220525085408.812273-1-liuyacan@corp.netease.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3469 lines
87 KiB
C
3469 lines
87 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* AF_SMC protocol family socket handler keeping the AF_INET sock address type
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* applies to SOCK_STREAM sockets only
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* offers an alternative communication option for TCP-protocol sockets
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* applicable with RoCE-cards only
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*
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* Initial restrictions:
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* - support for alternate links postponed
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*
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* Copyright IBM Corp. 2016, 2018
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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* based on prototype from Frank Blaschka
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*/
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#define KMSG_COMPONENT "smc"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/socket.h>
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#include <linux/workqueue.h>
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#include <linux/in.h>
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#include <linux/sched/signal.h>
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#include <linux/if_vlan.h>
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#include <linux/rcupdate_wait.h>
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#include <linux/ctype.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <net/smc.h>
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#include <asm/ioctls.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include "smc_netns.h"
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#include "smc.h"
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#include "smc_clc.h"
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#include "smc_llc.h"
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#include "smc_cdc.h"
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#include "smc_core.h"
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#include "smc_ib.h"
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#include "smc_ism.h"
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#include "smc_pnet.h"
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#include "smc_netlink.h"
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#include "smc_tx.h"
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#include "smc_rx.h"
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#include "smc_close.h"
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#include "smc_stats.h"
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#include "smc_tracepoint.h"
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#include "smc_sysctl.h"
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static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
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* creation on server
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*/
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static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
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* creation on client
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*/
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static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */
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struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
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struct workqueue_struct *smc_close_wq; /* wq for close work */
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static void smc_tcp_listen_work(struct work_struct *);
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static void smc_connect_work(struct work_struct *);
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int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
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void *hdr;
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if (cb_ctx->pos[0])
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goto out;
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hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
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&smc_gen_nl_family, NLM_F_MULTI,
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SMC_NETLINK_DUMP_HS_LIMITATION);
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if (!hdr)
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return -ENOMEM;
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if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
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sock_net(skb->sk)->smc.limit_smc_hs))
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goto err;
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genlmsg_end(skb, hdr);
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cb_ctx->pos[0] = 1;
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out:
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return skb->len;
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err:
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genlmsg_cancel(skb, hdr);
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return -EMSGSIZE;
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}
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int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
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{
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sock_net(skb->sk)->smc.limit_smc_hs = true;
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return 0;
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}
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int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
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{
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sock_net(skb->sk)->smc.limit_smc_hs = false;
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return 0;
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}
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static void smc_set_keepalive(struct sock *sk, int val)
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{
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struct smc_sock *smc = smc_sk(sk);
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smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
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}
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static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
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struct sk_buff *skb,
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struct request_sock *req,
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struct dst_entry *dst,
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struct request_sock *req_unhash,
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bool *own_req)
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{
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struct smc_sock *smc;
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struct sock *child;
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smc = smc_clcsock_user_data(sk);
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if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
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sk->sk_max_ack_backlog)
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goto drop;
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if (sk_acceptq_is_full(&smc->sk)) {
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NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
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goto drop;
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}
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/* passthrough to original syn recv sock fct */
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child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
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own_req);
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/* child must not inherit smc or its ops */
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if (child) {
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rcu_assign_sk_user_data(child, NULL);
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/* v4-mapped sockets don't inherit parent ops. Don't restore. */
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if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
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inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
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}
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return child;
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drop:
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dst_release(dst);
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tcp_listendrop(sk);
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return NULL;
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}
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static bool smc_hs_congested(const struct sock *sk)
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{
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const struct smc_sock *smc;
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smc = smc_clcsock_user_data(sk);
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if (!smc)
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return true;
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if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
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return true;
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return false;
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}
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static struct smc_hashinfo smc_v4_hashinfo = {
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.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
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};
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static struct smc_hashinfo smc_v6_hashinfo = {
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.lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
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};
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int smc_hash_sk(struct sock *sk)
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{
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struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
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struct hlist_head *head;
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head = &h->ht;
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write_lock_bh(&h->lock);
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sk_add_node(sk, head);
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write_unlock_bh(&h->lock);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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return 0;
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}
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EXPORT_SYMBOL_GPL(smc_hash_sk);
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void smc_unhash_sk(struct sock *sk)
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{
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struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
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write_lock_bh(&h->lock);
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if (sk_del_node_init(sk))
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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write_unlock_bh(&h->lock);
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}
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EXPORT_SYMBOL_GPL(smc_unhash_sk);
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/* This will be called before user really release sock_lock. So do the
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* work which we didn't do because of user hold the sock_lock in the
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* BH context
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*/
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static void smc_release_cb(struct sock *sk)
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{
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struct smc_sock *smc = smc_sk(sk);
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if (smc->conn.tx_in_release_sock) {
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smc_tx_pending(&smc->conn);
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smc->conn.tx_in_release_sock = false;
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}
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}
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struct proto smc_proto = {
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.name = "SMC",
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.owner = THIS_MODULE,
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.keepalive = smc_set_keepalive,
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.hash = smc_hash_sk,
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.unhash = smc_unhash_sk,
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.release_cb = smc_release_cb,
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.obj_size = sizeof(struct smc_sock),
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.h.smc_hash = &smc_v4_hashinfo,
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.slab_flags = SLAB_TYPESAFE_BY_RCU,
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};
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EXPORT_SYMBOL_GPL(smc_proto);
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struct proto smc_proto6 = {
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.name = "SMC6",
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.owner = THIS_MODULE,
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.keepalive = smc_set_keepalive,
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.hash = smc_hash_sk,
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.unhash = smc_unhash_sk,
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.release_cb = smc_release_cb,
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.obj_size = sizeof(struct smc_sock),
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.h.smc_hash = &smc_v6_hashinfo,
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.slab_flags = SLAB_TYPESAFE_BY_RCU,
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};
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EXPORT_SYMBOL_GPL(smc_proto6);
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static void smc_fback_restore_callbacks(struct smc_sock *smc)
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{
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struct sock *clcsk = smc->clcsock->sk;
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write_lock_bh(&clcsk->sk_callback_lock);
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clcsk->sk_user_data = NULL;
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smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
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smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
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smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
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smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
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write_unlock_bh(&clcsk->sk_callback_lock);
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}
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static void smc_restore_fallback_changes(struct smc_sock *smc)
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{
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if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
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smc->clcsock->file->private_data = smc->sk.sk_socket;
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smc->clcsock->file = NULL;
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smc_fback_restore_callbacks(smc);
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}
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}
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static int __smc_release(struct smc_sock *smc)
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{
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struct sock *sk = &smc->sk;
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int rc = 0;
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if (!smc->use_fallback) {
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rc = smc_close_active(smc);
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sock_set_flag(sk, SOCK_DEAD);
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sk->sk_shutdown |= SHUTDOWN_MASK;
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} else {
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if (sk->sk_state != SMC_CLOSED) {
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if (sk->sk_state != SMC_LISTEN &&
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sk->sk_state != SMC_INIT)
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sock_put(sk); /* passive closing */
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if (sk->sk_state == SMC_LISTEN) {
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/* wake up clcsock accept */
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rc = kernel_sock_shutdown(smc->clcsock,
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SHUT_RDWR);
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}
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sk->sk_state = SMC_CLOSED;
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sk->sk_state_change(sk);
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}
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smc_restore_fallback_changes(smc);
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}
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sk->sk_prot->unhash(sk);
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if (sk->sk_state == SMC_CLOSED) {
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if (smc->clcsock) {
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release_sock(sk);
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smc_clcsock_release(smc);
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lock_sock(sk);
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}
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if (!smc->use_fallback)
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smc_conn_free(&smc->conn);
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}
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return rc;
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}
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static int smc_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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int old_state, rc = 0;
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if (!sk)
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goto out;
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sock_hold(sk); /* sock_put below */
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smc = smc_sk(sk);
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old_state = sk->sk_state;
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/* cleanup for a dangling non-blocking connect */
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if (smc->connect_nonblock && old_state == SMC_INIT)
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tcp_abort(smc->clcsock->sk, ECONNABORTED);
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if (cancel_work_sync(&smc->connect_work))
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sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
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if (sk->sk_state == SMC_LISTEN)
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/* smc_close_non_accepted() is called and acquires
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* sock lock for child sockets again
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*/
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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else
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lock_sock(sk);
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if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
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!smc->use_fallback)
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smc_close_active_abort(smc);
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rc = __smc_release(smc);
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/* detach socket */
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sock_orphan(sk);
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sock->sk = NULL;
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release_sock(sk);
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sock_put(sk); /* sock_hold above */
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sock_put(sk); /* final sock_put */
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out:
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return rc;
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}
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static void smc_destruct(struct sock *sk)
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{
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if (sk->sk_state != SMC_CLOSED)
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return;
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if (!sock_flag(sk, SOCK_DEAD))
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return;
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sk_refcnt_debug_dec(sk);
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}
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|
|
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static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
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int protocol)
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{
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struct smc_sock *smc;
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struct proto *prot;
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struct sock *sk;
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prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
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sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
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if (!sk)
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return NULL;
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sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
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sk->sk_state = SMC_INIT;
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sk->sk_destruct = smc_destruct;
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sk->sk_protocol = protocol;
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smc = smc_sk(sk);
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INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
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INIT_WORK(&smc->connect_work, smc_connect_work);
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INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
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INIT_LIST_HEAD(&smc->accept_q);
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spin_lock_init(&smc->accept_q_lock);
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spin_lock_init(&smc->conn.send_lock);
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sk->sk_prot->hash(sk);
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sk_refcnt_debug_inc(sk);
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mutex_init(&smc->clcsock_release_lock);
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smc_init_saved_callbacks(smc);
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|
|
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return sk;
|
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}
|
|
|
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static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
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int addr_len)
|
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{
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struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
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struct sock *sk = sock->sk;
|
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struct smc_sock *smc;
|
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int rc;
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|
|
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smc = smc_sk(sk);
|
|
|
|
/* replicate tests from inet_bind(), to be safe wrt. future changes */
|
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rc = -EINVAL;
|
|
if (addr_len < sizeof(struct sockaddr_in))
|
|
goto out;
|
|
|
|
rc = -EAFNOSUPPORT;
|
|
if (addr->sin_family != AF_INET &&
|
|
addr->sin_family != AF_INET6 &&
|
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addr->sin_family != AF_UNSPEC)
|
|
goto out;
|
|
/* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
|
|
if (addr->sin_family == AF_UNSPEC &&
|
|
addr->sin_addr.s_addr != htonl(INADDR_ANY))
|
|
goto out;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Check if socket is already active */
|
|
rc = -EINVAL;
|
|
if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
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|
goto out_rel;
|
|
|
|
smc->clcsock->sk->sk_reuse = sk->sk_reuse;
|
|
rc = kernel_bind(smc->clcsock, uaddr, addr_len);
|
|
|
|
out_rel:
|
|
release_sock(sk);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
|
|
unsigned long mask)
|
|
{
|
|
/* options we don't get control via setsockopt for */
|
|
nsk->sk_type = osk->sk_type;
|
|
nsk->sk_sndbuf = osk->sk_sndbuf;
|
|
nsk->sk_rcvbuf = osk->sk_rcvbuf;
|
|
nsk->sk_sndtimeo = osk->sk_sndtimeo;
|
|
nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
|
|
nsk->sk_mark = osk->sk_mark;
|
|
nsk->sk_priority = osk->sk_priority;
|
|
nsk->sk_rcvlowat = osk->sk_rcvlowat;
|
|
nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
|
|
nsk->sk_err = osk->sk_err;
|
|
|
|
nsk->sk_flags &= ~mask;
|
|
nsk->sk_flags |= osk->sk_flags & mask;
|
|
}
|
|
|
|
#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
|
|
(1UL << SOCK_KEEPOPEN) | \
|
|
(1UL << SOCK_LINGER) | \
|
|
(1UL << SOCK_BROADCAST) | \
|
|
(1UL << SOCK_TIMESTAMP) | \
|
|
(1UL << SOCK_DBG) | \
|
|
(1UL << SOCK_RCVTSTAMP) | \
|
|
(1UL << SOCK_RCVTSTAMPNS) | \
|
|
(1UL << SOCK_LOCALROUTE) | \
|
|
(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
|
|
(1UL << SOCK_RXQ_OVFL) | \
|
|
(1UL << SOCK_WIFI_STATUS) | \
|
|
(1UL << SOCK_NOFCS) | \
|
|
(1UL << SOCK_FILTER_LOCKED) | \
|
|
(1UL << SOCK_TSTAMP_NEW))
|
|
/* copy only relevant settings and flags of SOL_SOCKET level from smc to
|
|
* clc socket (since smc is not called for these options from net/core)
|
|
*/
|
|
static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
|
|
{
|
|
smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
|
|
}
|
|
|
|
#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
|
|
(1UL << SOCK_KEEPOPEN) | \
|
|
(1UL << SOCK_LINGER) | \
|
|
(1UL << SOCK_DBG))
|
|
/* copy only settings and flags relevant for smc from clc to smc socket */
|
|
static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
|
|
{
|
|
smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
|
|
}
|
|
|
|
/* register the new rmb on all links */
|
|
static int smcr_lgr_reg_rmbs(struct smc_link *link,
|
|
struct smc_buf_desc *rmb_desc)
|
|
{
|
|
struct smc_link_group *lgr = link->lgr;
|
|
int i, rc = 0;
|
|
|
|
rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
|
|
if (rc)
|
|
return rc;
|
|
/* protect against parallel smc_llc_cli_rkey_exchange() and
|
|
* parallel smcr_link_reg_rmb()
|
|
*/
|
|
mutex_lock(&lgr->llc_conf_mutex);
|
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
|
|
if (!smc_link_active(&lgr->lnk[i]))
|
|
continue;
|
|
rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
/* exchange confirm_rkey msg with peer */
|
|
rc = smc_llc_do_confirm_rkey(link, rmb_desc);
|
|
if (rc) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
rmb_desc->is_conf_rkey = true;
|
|
out:
|
|
mutex_unlock(&lgr->llc_conf_mutex);
|
|
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
|
|
return rc;
|
|
}
|
|
|
|
static int smcr_clnt_conf_first_link(struct smc_sock *smc)
|
|
{
|
|
struct smc_link *link = smc->conn.lnk;
|
|
struct smc_llc_qentry *qentry;
|
|
int rc;
|
|
|
|
/* receive CONFIRM LINK request from server over RoCE fabric */
|
|
qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
|
|
SMC_LLC_CONFIRM_LINK);
|
|
if (!qentry) {
|
|
struct smc_clc_msg_decline dclc;
|
|
|
|
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
|
|
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
|
|
return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
|
|
}
|
|
smc_llc_save_peer_uid(qentry);
|
|
rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
|
|
smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
|
|
if (rc)
|
|
return SMC_CLC_DECL_RMBE_EC;
|
|
|
|
rc = smc_ib_modify_qp_rts(link);
|
|
if (rc)
|
|
return SMC_CLC_DECL_ERR_RDYLNK;
|
|
|
|
smc_wr_remember_qp_attr(link);
|
|
|
|
if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
|
|
return SMC_CLC_DECL_ERR_REGRMB;
|
|
|
|
/* confirm_rkey is implicit on 1st contact */
|
|
smc->conn.rmb_desc->is_conf_rkey = true;
|
|
|
|
/* send CONFIRM LINK response over RoCE fabric */
|
|
rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
|
|
if (rc < 0)
|
|
return SMC_CLC_DECL_TIMEOUT_CL;
|
|
|
|
smc_llc_link_active(link);
|
|
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
|
|
|
|
/* optional 2nd link, receive ADD LINK request from server */
|
|
qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
|
|
SMC_LLC_ADD_LINK);
|
|
if (!qentry) {
|
|
struct smc_clc_msg_decline dclc;
|
|
|
|
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
|
|
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
|
|
if (rc == -EAGAIN)
|
|
rc = 0; /* no DECLINE received, go with one link */
|
|
return rc;
|
|
}
|
|
smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
|
|
smc_llc_cli_add_link(link, qentry);
|
|
return 0;
|
|
}
|
|
|
|
static bool smc_isascii(char *hostname)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
|
|
if (!isascii(hostname[i]))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *clc)
|
|
{
|
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
|
|
(struct smc_clc_msg_accept_confirm_v2 *)clc;
|
|
struct smc_clc_first_contact_ext *fce;
|
|
int clc_v2_len;
|
|
|
|
if (clc->hdr.version == SMC_V1 ||
|
|
!(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
|
|
return;
|
|
|
|
if (smc->conn.lgr->is_smcd) {
|
|
memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
|
|
SMC_MAX_EID_LEN);
|
|
clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
|
|
d1);
|
|
} else {
|
|
memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
|
|
SMC_MAX_EID_LEN);
|
|
clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
|
|
r1);
|
|
}
|
|
fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
|
|
smc->conn.lgr->peer_os = fce->os_type;
|
|
smc->conn.lgr->peer_smc_release = fce->release;
|
|
if (smc_isascii(fce->hostname))
|
|
memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
|
|
SMC_MAX_HOSTNAME_LEN);
|
|
}
|
|
|
|
static void smcr_conn_save_peer_info(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *clc)
|
|
{
|
|
int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
|
|
|
|
smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
|
|
smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
|
|
smc->conn.peer_rmbe_size = bufsize;
|
|
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
|
|
smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
|
|
}
|
|
|
|
static void smcd_conn_save_peer_info(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *clc)
|
|
{
|
|
int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
|
|
|
|
smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
|
|
smc->conn.peer_token = clc->d0.token;
|
|
/* msg header takes up space in the buffer */
|
|
smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
|
|
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
|
|
smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
|
|
}
|
|
|
|
static void smc_conn_save_peer_info(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *clc)
|
|
{
|
|
if (smc->conn.lgr->is_smcd)
|
|
smcd_conn_save_peer_info(smc, clc);
|
|
else
|
|
smcr_conn_save_peer_info(smc, clc);
|
|
smc_conn_save_peer_info_fce(smc, clc);
|
|
}
|
|
|
|
static void smc_link_save_peer_info(struct smc_link *link,
|
|
struct smc_clc_msg_accept_confirm *clc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
link->peer_qpn = ntoh24(clc->r0.qpn);
|
|
memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
|
|
memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
|
|
link->peer_psn = ntoh24(clc->r0.psn);
|
|
link->peer_mtu = clc->r0.qp_mtu;
|
|
}
|
|
|
|
static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
|
|
struct smc_stats_fback *fback_arr)
|
|
{
|
|
int cnt;
|
|
|
|
for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
|
|
if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
|
|
fback_arr[cnt].count++;
|
|
break;
|
|
}
|
|
if (!fback_arr[cnt].fback_code) {
|
|
fback_arr[cnt].fback_code = smc->fallback_rsn;
|
|
fback_arr[cnt].count++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void smc_stat_fallback(struct smc_sock *smc)
|
|
{
|
|
struct net *net = sock_net(&smc->sk);
|
|
|
|
mutex_lock(&net->smc.mutex_fback_rsn);
|
|
if (smc->listen_smc) {
|
|
smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
|
|
net->smc.fback_rsn->srv_fback_cnt++;
|
|
} else {
|
|
smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
|
|
net->smc.fback_rsn->clnt_fback_cnt++;
|
|
}
|
|
mutex_unlock(&net->smc.mutex_fback_rsn);
|
|
}
|
|
|
|
/* must be called under rcu read lock */
|
|
static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
|
|
{
|
|
struct socket_wq *wq;
|
|
__poll_t flags;
|
|
|
|
wq = rcu_dereference(smc->sk.sk_wq);
|
|
if (!skwq_has_sleeper(wq))
|
|
return;
|
|
|
|
/* wake up smc sk->sk_wq */
|
|
if (!key) {
|
|
/* sk_state_change */
|
|
wake_up_interruptible_all(&wq->wait);
|
|
} else {
|
|
flags = key_to_poll(key);
|
|
if (flags & (EPOLLIN | EPOLLOUT))
|
|
/* sk_data_ready or sk_write_space */
|
|
wake_up_interruptible_sync_poll(&wq->wait, flags);
|
|
else if (flags & EPOLLERR)
|
|
/* sk_error_report */
|
|
wake_up_interruptible_poll(&wq->wait, flags);
|
|
}
|
|
}
|
|
|
|
static int smc_fback_mark_woken(wait_queue_entry_t *wait,
|
|
unsigned int mode, int sync, void *key)
|
|
{
|
|
struct smc_mark_woken *mark =
|
|
container_of(wait, struct smc_mark_woken, wait_entry);
|
|
|
|
mark->woken = true;
|
|
mark->key = key;
|
|
return 0;
|
|
}
|
|
|
|
static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
|
|
void (*clcsock_callback)(struct sock *sk))
|
|
{
|
|
struct smc_mark_woken mark = { .woken = false };
|
|
struct socket_wq *wq;
|
|
|
|
init_waitqueue_func_entry(&mark.wait_entry,
|
|
smc_fback_mark_woken);
|
|
rcu_read_lock();
|
|
wq = rcu_dereference(clcsk->sk_wq);
|
|
if (!wq)
|
|
goto out;
|
|
add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
|
|
clcsock_callback(clcsk);
|
|
remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
|
|
|
|
if (mark.woken)
|
|
smc_fback_wakeup_waitqueue(smc, mark.key);
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void smc_fback_state_change(struct sock *clcsk)
|
|
{
|
|
struct smc_sock *smc;
|
|
|
|
read_lock_bh(&clcsk->sk_callback_lock);
|
|
smc = smc_clcsock_user_data(clcsk);
|
|
if (smc)
|
|
smc_fback_forward_wakeup(smc, clcsk,
|
|
smc->clcsk_state_change);
|
|
read_unlock_bh(&clcsk->sk_callback_lock);
|
|
}
|
|
|
|
static void smc_fback_data_ready(struct sock *clcsk)
|
|
{
|
|
struct smc_sock *smc;
|
|
|
|
read_lock_bh(&clcsk->sk_callback_lock);
|
|
smc = smc_clcsock_user_data(clcsk);
|
|
if (smc)
|
|
smc_fback_forward_wakeup(smc, clcsk,
|
|
smc->clcsk_data_ready);
|
|
read_unlock_bh(&clcsk->sk_callback_lock);
|
|
}
|
|
|
|
static void smc_fback_write_space(struct sock *clcsk)
|
|
{
|
|
struct smc_sock *smc;
|
|
|
|
read_lock_bh(&clcsk->sk_callback_lock);
|
|
smc = smc_clcsock_user_data(clcsk);
|
|
if (smc)
|
|
smc_fback_forward_wakeup(smc, clcsk,
|
|
smc->clcsk_write_space);
|
|
read_unlock_bh(&clcsk->sk_callback_lock);
|
|
}
|
|
|
|
static void smc_fback_error_report(struct sock *clcsk)
|
|
{
|
|
struct smc_sock *smc;
|
|
|
|
read_lock_bh(&clcsk->sk_callback_lock);
|
|
smc = smc_clcsock_user_data(clcsk);
|
|
if (smc)
|
|
smc_fback_forward_wakeup(smc, clcsk,
|
|
smc->clcsk_error_report);
|
|
read_unlock_bh(&clcsk->sk_callback_lock);
|
|
}
|
|
|
|
static void smc_fback_replace_callbacks(struct smc_sock *smc)
|
|
{
|
|
struct sock *clcsk = smc->clcsock->sk;
|
|
|
|
write_lock_bh(&clcsk->sk_callback_lock);
|
|
clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
|
|
|
|
smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
|
|
&smc->clcsk_state_change);
|
|
smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
|
|
&smc->clcsk_data_ready);
|
|
smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
|
|
&smc->clcsk_write_space);
|
|
smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
|
|
&smc->clcsk_error_report);
|
|
|
|
write_unlock_bh(&clcsk->sk_callback_lock);
|
|
}
|
|
|
|
static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
|
|
{
|
|
int rc = 0;
|
|
|
|
mutex_lock(&smc->clcsock_release_lock);
|
|
if (!smc->clcsock) {
|
|
rc = -EBADF;
|
|
goto out;
|
|
}
|
|
|
|
smc->use_fallback = true;
|
|
smc->fallback_rsn = reason_code;
|
|
smc_stat_fallback(smc);
|
|
trace_smc_switch_to_fallback(smc, reason_code);
|
|
if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
|
|
smc->clcsock->file = smc->sk.sk_socket->file;
|
|
smc->clcsock->file->private_data = smc->clcsock;
|
|
smc->clcsock->wq.fasync_list =
|
|
smc->sk.sk_socket->wq.fasync_list;
|
|
|
|
/* There might be some wait entries remaining
|
|
* in smc sk->sk_wq and they should be woken up
|
|
* as clcsock's wait queue is woken up.
|
|
*/
|
|
smc_fback_replace_callbacks(smc);
|
|
}
|
|
out:
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
return rc;
|
|
}
|
|
|
|
/* fall back during connect */
|
|
static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
|
|
{
|
|
struct net *net = sock_net(&smc->sk);
|
|
int rc = 0;
|
|
|
|
rc = smc_switch_to_fallback(smc, reason_code);
|
|
if (rc) { /* fallback fails */
|
|
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
sock_put(&smc->sk); /* passive closing */
|
|
return rc;
|
|
}
|
|
smc_copy_sock_settings_to_clc(smc);
|
|
smc->connect_nonblock = 0;
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
smc->sk.sk_state = SMC_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
/* decline and fall back during connect */
|
|
static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
|
|
u8 version)
|
|
{
|
|
struct net *net = sock_net(&smc->sk);
|
|
int rc;
|
|
|
|
if (reason_code < 0) { /* error, fallback is not possible */
|
|
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
sock_put(&smc->sk); /* passive closing */
|
|
return reason_code;
|
|
}
|
|
if (reason_code != SMC_CLC_DECL_PEERDECL) {
|
|
rc = smc_clc_send_decline(smc, reason_code, version);
|
|
if (rc < 0) {
|
|
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
sock_put(&smc->sk); /* passive closing */
|
|
return rc;
|
|
}
|
|
}
|
|
return smc_connect_fallback(smc, reason_code);
|
|
}
|
|
|
|
static void smc_conn_abort(struct smc_sock *smc, int local_first)
|
|
{
|
|
struct smc_connection *conn = &smc->conn;
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
bool lgr_valid = false;
|
|
|
|
if (smc_conn_lgr_valid(conn))
|
|
lgr_valid = true;
|
|
|
|
smc_conn_free(conn);
|
|
if (local_first && lgr_valid)
|
|
smc_lgr_cleanup_early(lgr);
|
|
}
|
|
|
|
/* check if there is a rdma device available for this connection. */
|
|
/* called for connect and listen */
|
|
static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
|
|
{
|
|
/* PNET table look up: search active ib_device and port
|
|
* within same PNETID that also contains the ethernet device
|
|
* used for the internal TCP socket
|
|
*/
|
|
smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
|
|
if (!ini->check_smcrv2 && !ini->ib_dev)
|
|
return SMC_CLC_DECL_NOSMCRDEV;
|
|
if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
|
|
return SMC_CLC_DECL_NOSMCRDEV;
|
|
return 0;
|
|
}
|
|
|
|
/* check if there is an ISM device available for this connection. */
|
|
/* called for connect and listen */
|
|
static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
|
|
{
|
|
/* Find ISM device with same PNETID as connecting interface */
|
|
smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
|
|
if (!ini->ism_dev[0])
|
|
return SMC_CLC_DECL_NOSMCDDEV;
|
|
else
|
|
ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
|
|
return 0;
|
|
}
|
|
|
|
/* is chid unique for the ism devices that are already determined? */
|
|
static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
|
|
int cnt)
|
|
{
|
|
int i = (!ini->ism_dev[0]) ? 1 : 0;
|
|
|
|
for (; i < cnt; i++)
|
|
if (ini->ism_chid[i] == chid)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
|
|
* PNETID matching net_device)
|
|
*/
|
|
static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc = SMC_CLC_DECL_NOSMCDDEV;
|
|
struct smcd_dev *smcd;
|
|
int i = 1;
|
|
u16 chid;
|
|
|
|
if (smcd_indicated(ini->smc_type_v1))
|
|
rc = 0; /* already initialized for V1 */
|
|
mutex_lock(&smcd_dev_list.mutex);
|
|
list_for_each_entry(smcd, &smcd_dev_list.list, list) {
|
|
if (smcd->going_away || smcd == ini->ism_dev[0])
|
|
continue;
|
|
chid = smc_ism_get_chid(smcd);
|
|
if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
|
|
continue;
|
|
if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
|
|
smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
|
|
ini->ism_dev[i] = smcd;
|
|
ini->ism_chid[i] = chid;
|
|
ini->is_smcd = true;
|
|
rc = 0;
|
|
i++;
|
|
if (i > SMC_MAX_ISM_DEVS)
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&smcd_dev_list.mutex);
|
|
ini->ism_offered_cnt = i - 1;
|
|
if (!ini->ism_dev[0] && !ini->ism_dev[1])
|
|
ini->smcd_version = 0;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Check for VLAN ID and register it on ISM device just for CLC handshake */
|
|
static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
|
|
return SMC_CLC_DECL_ISMVLANERR;
|
|
return 0;
|
|
}
|
|
|
|
static int smc_find_proposal_devices(struct smc_sock *smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc = 0;
|
|
|
|
/* check if there is an ism device available */
|
|
if (!(ini->smcd_version & SMC_V1) ||
|
|
smc_find_ism_device(smc, ini) ||
|
|
smc_connect_ism_vlan_setup(smc, ini))
|
|
ini->smcd_version &= ~SMC_V1;
|
|
/* else ISM V1 is supported for this connection */
|
|
|
|
/* check if there is an rdma device available */
|
|
if (!(ini->smcr_version & SMC_V1) ||
|
|
smc_find_rdma_device(smc, ini))
|
|
ini->smcr_version &= ~SMC_V1;
|
|
/* else RDMA is supported for this connection */
|
|
|
|
ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
|
|
ini->smcr_version & SMC_V1);
|
|
|
|
/* check if there is an ism v2 device available */
|
|
if (!(ini->smcd_version & SMC_V2) ||
|
|
!smc_ism_is_v2_capable() ||
|
|
smc_find_ism_v2_device_clnt(smc, ini))
|
|
ini->smcd_version &= ~SMC_V2;
|
|
|
|
/* check if there is an rdma v2 device available */
|
|
ini->check_smcrv2 = true;
|
|
ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
|
|
if (!(ini->smcr_version & SMC_V2) ||
|
|
smc->clcsock->sk->sk_family != AF_INET ||
|
|
!smc_clc_ueid_count() ||
|
|
smc_find_rdma_device(smc, ini))
|
|
ini->smcr_version &= ~SMC_V2;
|
|
ini->check_smcrv2 = false;
|
|
|
|
ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
|
|
ini->smcr_version & SMC_V2);
|
|
|
|
/* if neither ISM nor RDMA are supported, fallback */
|
|
if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
|
|
rc = SMC_CLC_DECL_NOSMCDEV;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
|
|
* used, the VLAN ID will be registered again during the connection setup.
|
|
*/
|
|
static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
if (!smcd_indicated(ini->smc_type_v1))
|
|
return 0;
|
|
if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
|
|
return SMC_CLC_DECL_CNFERR;
|
|
return 0;
|
|
}
|
|
|
|
#define SMC_CLC_MAX_ACCEPT_LEN \
|
|
(sizeof(struct smc_clc_msg_accept_confirm_v2) + \
|
|
sizeof(struct smc_clc_first_contact_ext) + \
|
|
sizeof(struct smc_clc_msg_trail))
|
|
|
|
/* CLC handshake during connect */
|
|
static int smc_connect_clc(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm_v2 *aclc2,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc = 0;
|
|
|
|
/* do inband token exchange */
|
|
rc = smc_clc_send_proposal(smc, ini);
|
|
if (rc)
|
|
return rc;
|
|
/* receive SMC Accept CLC message */
|
|
return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
|
|
SMC_CLC_ACCEPT, CLC_WAIT_TIME);
|
|
}
|
|
|
|
void smc_fill_gid_list(struct smc_link_group *lgr,
|
|
struct smc_gidlist *gidlist,
|
|
struct smc_ib_device *known_dev, u8 *known_gid)
|
|
{
|
|
struct smc_init_info *alt_ini = NULL;
|
|
|
|
memset(gidlist, 0, sizeof(*gidlist));
|
|
memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
|
|
|
|
alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
|
|
if (!alt_ini)
|
|
goto out;
|
|
|
|
alt_ini->vlan_id = lgr->vlan_id;
|
|
alt_ini->check_smcrv2 = true;
|
|
alt_ini->smcrv2.saddr = lgr->saddr;
|
|
smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
|
|
|
|
if (!alt_ini->smcrv2.ib_dev_v2)
|
|
goto out;
|
|
|
|
memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
|
|
SMC_GID_SIZE);
|
|
|
|
out:
|
|
kfree(alt_ini);
|
|
}
|
|
|
|
static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *aclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
|
|
(struct smc_clc_msg_accept_confirm_v2 *)aclc;
|
|
struct smc_clc_first_contact_ext *fce =
|
|
(struct smc_clc_first_contact_ext *)
|
|
(((u8 *)clc_v2) + sizeof(*clc_v2));
|
|
|
|
if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
|
|
return 0;
|
|
|
|
if (fce->v2_direct) {
|
|
memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
|
|
ini->smcrv2.uses_gateway = false;
|
|
} else {
|
|
if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr,
|
|
smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
|
|
ini->smcrv2.nexthop_mac,
|
|
&ini->smcrv2.uses_gateway))
|
|
return SMC_CLC_DECL_NOROUTE;
|
|
if (!ini->smcrv2.uses_gateway) {
|
|
/* mismatch: peer claims indirect, but its direct */
|
|
return SMC_CLC_DECL_NOINDIRECT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* setup for RDMA connection of client */
|
|
static int smc_connect_rdma(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *aclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int i, reason_code = 0;
|
|
struct smc_link *link;
|
|
u8 *eid = NULL;
|
|
|
|
ini->is_smcd = false;
|
|
ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
|
|
ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
|
|
memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
|
|
memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
|
|
memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
|
|
|
|
reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
|
|
if (reason_code)
|
|
return reason_code;
|
|
|
|
mutex_lock(&smc_client_lgr_pending);
|
|
reason_code = smc_conn_create(smc, ini);
|
|
if (reason_code) {
|
|
mutex_unlock(&smc_client_lgr_pending);
|
|
return reason_code;
|
|
}
|
|
|
|
smc_conn_save_peer_info(smc, aclc);
|
|
|
|
if (ini->first_contact_local) {
|
|
link = smc->conn.lnk;
|
|
} else {
|
|
/* set link that was assigned by server */
|
|
link = NULL;
|
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
|
|
struct smc_link *l = &smc->conn.lgr->lnk[i];
|
|
|
|
if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
|
|
!memcmp(l->peer_gid, &aclc->r0.lcl.gid,
|
|
SMC_GID_SIZE) &&
|
|
(aclc->hdr.version > SMC_V1 ||
|
|
!memcmp(l->peer_mac, &aclc->r0.lcl.mac,
|
|
sizeof(l->peer_mac)))) {
|
|
link = l;
|
|
break;
|
|
}
|
|
}
|
|
if (!link) {
|
|
reason_code = SMC_CLC_DECL_NOSRVLINK;
|
|
goto connect_abort;
|
|
}
|
|
smc_switch_link_and_count(&smc->conn, link);
|
|
}
|
|
|
|
/* create send buffer and rmb */
|
|
if (smc_buf_create(smc, false)) {
|
|
reason_code = SMC_CLC_DECL_MEM;
|
|
goto connect_abort;
|
|
}
|
|
|
|
if (ini->first_contact_local)
|
|
smc_link_save_peer_info(link, aclc, ini);
|
|
|
|
if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
|
|
reason_code = SMC_CLC_DECL_ERR_RTOK;
|
|
goto connect_abort;
|
|
}
|
|
|
|
smc_close_init(smc);
|
|
smc_rx_init(smc);
|
|
|
|
if (ini->first_contact_local) {
|
|
if (smc_ib_ready_link(link)) {
|
|
reason_code = SMC_CLC_DECL_ERR_RDYLNK;
|
|
goto connect_abort;
|
|
}
|
|
} else {
|
|
if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
|
|
reason_code = SMC_CLC_DECL_ERR_REGRMB;
|
|
goto connect_abort;
|
|
}
|
|
}
|
|
smc_rmb_sync_sg_for_device(&smc->conn);
|
|
|
|
if (aclc->hdr.version > SMC_V1) {
|
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
|
|
(struct smc_clc_msg_accept_confirm_v2 *)aclc;
|
|
|
|
eid = clc_v2->r1.eid;
|
|
if (ini->first_contact_local)
|
|
smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
|
|
link->smcibdev, link->gid);
|
|
}
|
|
|
|
reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
|
|
aclc->hdr.version, eid, ini);
|
|
if (reason_code)
|
|
goto connect_abort;
|
|
|
|
smc_tx_init(smc);
|
|
|
|
if (ini->first_contact_local) {
|
|
/* QP confirmation over RoCE fabric */
|
|
smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
|
|
reason_code = smcr_clnt_conf_first_link(smc);
|
|
smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
|
|
if (reason_code)
|
|
goto connect_abort;
|
|
}
|
|
mutex_unlock(&smc_client_lgr_pending);
|
|
|
|
smc_copy_sock_settings_to_clc(smc);
|
|
smc->connect_nonblock = 0;
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
smc->sk.sk_state = SMC_ACTIVE;
|
|
|
|
return 0;
|
|
connect_abort:
|
|
smc_conn_abort(smc, ini->first_contact_local);
|
|
mutex_unlock(&smc_client_lgr_pending);
|
|
smc->connect_nonblock = 0;
|
|
|
|
return reason_code;
|
|
}
|
|
|
|
/* The server has chosen one of the proposed ISM devices for the communication.
|
|
* Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
|
|
*/
|
|
static int
|
|
smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
|
|
if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
|
|
ini->ism_selected = i;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EPROTO;
|
|
}
|
|
|
|
/* setup for ISM connection of client */
|
|
static int smc_connect_ism(struct smc_sock *smc,
|
|
struct smc_clc_msg_accept_confirm *aclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
u8 *eid = NULL;
|
|
int rc = 0;
|
|
|
|
ini->is_smcd = true;
|
|
ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
|
|
|
|
if (aclc->hdr.version == SMC_V2) {
|
|
struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
|
|
(struct smc_clc_msg_accept_confirm_v2 *)aclc;
|
|
|
|
rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
|
|
|
|
/* there is only one lgr role for SMC-D; use server lock */
|
|
mutex_lock(&smc_server_lgr_pending);
|
|
rc = smc_conn_create(smc, ini);
|
|
if (rc) {
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
return rc;
|
|
}
|
|
|
|
/* Create send and receive buffers */
|
|
rc = smc_buf_create(smc, true);
|
|
if (rc) {
|
|
rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
|
|
goto connect_abort;
|
|
}
|
|
|
|
smc_conn_save_peer_info(smc, aclc);
|
|
smc_close_init(smc);
|
|
smc_rx_init(smc);
|
|
smc_tx_init(smc);
|
|
|
|
if (aclc->hdr.version > SMC_V1) {
|
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
|
|
(struct smc_clc_msg_accept_confirm_v2 *)aclc;
|
|
|
|
eid = clc_v2->d1.eid;
|
|
}
|
|
|
|
rc = smc_clc_send_confirm(smc, ini->first_contact_local,
|
|
aclc->hdr.version, eid, NULL);
|
|
if (rc)
|
|
goto connect_abort;
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
|
|
smc_copy_sock_settings_to_clc(smc);
|
|
smc->connect_nonblock = 0;
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
smc->sk.sk_state = SMC_ACTIVE;
|
|
|
|
return 0;
|
|
connect_abort:
|
|
smc_conn_abort(smc, ini->first_contact_local);
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
smc->connect_nonblock = 0;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* check if received accept type and version matches a proposed one */
|
|
static int smc_connect_check_aclc(struct smc_init_info *ini,
|
|
struct smc_clc_msg_accept_confirm *aclc)
|
|
{
|
|
if (aclc->hdr.typev1 != SMC_TYPE_R &&
|
|
aclc->hdr.typev1 != SMC_TYPE_D)
|
|
return SMC_CLC_DECL_MODEUNSUPP;
|
|
|
|
if (aclc->hdr.version >= SMC_V2) {
|
|
if ((aclc->hdr.typev1 == SMC_TYPE_R &&
|
|
!smcr_indicated(ini->smc_type_v2)) ||
|
|
(aclc->hdr.typev1 == SMC_TYPE_D &&
|
|
!smcd_indicated(ini->smc_type_v2)))
|
|
return SMC_CLC_DECL_MODEUNSUPP;
|
|
} else {
|
|
if ((aclc->hdr.typev1 == SMC_TYPE_R &&
|
|
!smcr_indicated(ini->smc_type_v1)) ||
|
|
(aclc->hdr.typev1 == SMC_TYPE_D &&
|
|
!smcd_indicated(ini->smc_type_v1)))
|
|
return SMC_CLC_DECL_MODEUNSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* perform steps before actually connecting */
|
|
static int __smc_connect(struct smc_sock *smc)
|
|
{
|
|
u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
|
|
struct smc_clc_msg_accept_confirm_v2 *aclc2;
|
|
struct smc_clc_msg_accept_confirm *aclc;
|
|
struct smc_init_info *ini = NULL;
|
|
u8 *buf = NULL;
|
|
int rc = 0;
|
|
|
|
if (smc->use_fallback)
|
|
return smc_connect_fallback(smc, smc->fallback_rsn);
|
|
|
|
/* if peer has not signalled SMC-capability, fall back */
|
|
if (!tcp_sk(smc->clcsock->sk)->syn_smc)
|
|
return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
|
|
|
|
/* IPSec connections opt out of SMC optimizations */
|
|
if (using_ipsec(smc))
|
|
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
|
|
version);
|
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL);
|
|
if (!ini)
|
|
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
|
|
version);
|
|
|
|
ini->smcd_version = SMC_V1 | SMC_V2;
|
|
ini->smcr_version = SMC_V1 | SMC_V2;
|
|
ini->smc_type_v1 = SMC_TYPE_B;
|
|
ini->smc_type_v2 = SMC_TYPE_B;
|
|
|
|
/* get vlan id from IP device */
|
|
if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
|
|
ini->smcd_version &= ~SMC_V1;
|
|
ini->smcr_version = 0;
|
|
ini->smc_type_v1 = SMC_TYPE_N;
|
|
if (!ini->smcd_version) {
|
|
rc = SMC_CLC_DECL_GETVLANERR;
|
|
goto fallback;
|
|
}
|
|
}
|
|
|
|
rc = smc_find_proposal_devices(smc, ini);
|
|
if (rc)
|
|
goto fallback;
|
|
|
|
buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = SMC_CLC_DECL_MEM;
|
|
goto fallback;
|
|
}
|
|
aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
|
|
aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
|
|
|
|
/* perform CLC handshake */
|
|
rc = smc_connect_clc(smc, aclc2, ini);
|
|
if (rc) {
|
|
/* -EAGAIN on timeout, see tcp_recvmsg() */
|
|
if (rc == -EAGAIN) {
|
|
rc = -ETIMEDOUT;
|
|
smc->sk.sk_err = ETIMEDOUT;
|
|
}
|
|
goto vlan_cleanup;
|
|
}
|
|
|
|
/* check if smc modes and versions of CLC proposal and accept match */
|
|
rc = smc_connect_check_aclc(ini, aclc);
|
|
version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
|
|
if (rc)
|
|
goto vlan_cleanup;
|
|
|
|
/* depending on previous steps, connect using rdma or ism */
|
|
if (aclc->hdr.typev1 == SMC_TYPE_R) {
|
|
ini->smcr_version = version;
|
|
rc = smc_connect_rdma(smc, aclc, ini);
|
|
} else if (aclc->hdr.typev1 == SMC_TYPE_D) {
|
|
ini->smcd_version = version;
|
|
rc = smc_connect_ism(smc, aclc, ini);
|
|
}
|
|
if (rc)
|
|
goto vlan_cleanup;
|
|
|
|
SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
|
|
smc_connect_ism_vlan_cleanup(smc, ini);
|
|
kfree(buf);
|
|
kfree(ini);
|
|
return 0;
|
|
|
|
vlan_cleanup:
|
|
smc_connect_ism_vlan_cleanup(smc, ini);
|
|
kfree(buf);
|
|
fallback:
|
|
kfree(ini);
|
|
return smc_connect_decline_fallback(smc, rc, version);
|
|
}
|
|
|
|
static void smc_connect_work(struct work_struct *work)
|
|
{
|
|
struct smc_sock *smc = container_of(work, struct smc_sock,
|
|
connect_work);
|
|
long timeo = smc->sk.sk_sndtimeo;
|
|
int rc = 0;
|
|
|
|
if (!timeo)
|
|
timeo = MAX_SCHEDULE_TIMEOUT;
|
|
lock_sock(smc->clcsock->sk);
|
|
if (smc->clcsock->sk->sk_err) {
|
|
smc->sk.sk_err = smc->clcsock->sk->sk_err;
|
|
} else if ((1 << smc->clcsock->sk->sk_state) &
|
|
(TCPF_SYN_SENT | TCPF_SYN_RECV)) {
|
|
rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
|
|
if ((rc == -EPIPE) &&
|
|
((1 << smc->clcsock->sk->sk_state) &
|
|
(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
|
|
rc = 0;
|
|
}
|
|
release_sock(smc->clcsock->sk);
|
|
lock_sock(&smc->sk);
|
|
if (rc != 0 || smc->sk.sk_err) {
|
|
smc->sk.sk_state = SMC_CLOSED;
|
|
if (rc == -EPIPE || rc == -EAGAIN)
|
|
smc->sk.sk_err = EPIPE;
|
|
else if (rc == -ECONNREFUSED)
|
|
smc->sk.sk_err = ECONNREFUSED;
|
|
else if (signal_pending(current))
|
|
smc->sk.sk_err = -sock_intr_errno(timeo);
|
|
sock_put(&smc->sk); /* passive closing */
|
|
goto out;
|
|
}
|
|
|
|
rc = __smc_connect(smc);
|
|
if (rc < 0)
|
|
smc->sk.sk_err = -rc;
|
|
|
|
out:
|
|
if (!sock_flag(&smc->sk, SOCK_DEAD)) {
|
|
if (smc->sk.sk_err) {
|
|
smc->sk.sk_state_change(&smc->sk);
|
|
} else { /* allow polling before and after fallback decision */
|
|
smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
|
|
smc->sk.sk_write_space(&smc->sk);
|
|
}
|
|
}
|
|
release_sock(&smc->sk);
|
|
}
|
|
|
|
static int smc_connect(struct socket *sock, struct sockaddr *addr,
|
|
int alen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc = -EINVAL;
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
/* separate smc parameter checking to be safe */
|
|
if (alen < sizeof(addr->sa_family))
|
|
goto out_err;
|
|
if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
|
|
goto out_err;
|
|
|
|
lock_sock(sk);
|
|
switch (sock->state) {
|
|
default:
|
|
rc = -EINVAL;
|
|
goto out;
|
|
case SS_CONNECTED:
|
|
rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
|
|
goto out;
|
|
case SS_CONNECTING:
|
|
if (sk->sk_state == SMC_ACTIVE)
|
|
goto connected;
|
|
break;
|
|
case SS_UNCONNECTED:
|
|
sock->state = SS_CONNECTING;
|
|
break;
|
|
}
|
|
|
|
switch (sk->sk_state) {
|
|
default:
|
|
goto out;
|
|
case SMC_CLOSED:
|
|
rc = sock_error(sk) ? : -ECONNABORTED;
|
|
sock->state = SS_UNCONNECTED;
|
|
goto out;
|
|
case SMC_ACTIVE:
|
|
rc = -EISCONN;
|
|
goto out;
|
|
case SMC_INIT:
|
|
break;
|
|
}
|
|
|
|
smc_copy_sock_settings_to_clc(smc);
|
|
tcp_sk(smc->clcsock->sk)->syn_smc = 1;
|
|
if (smc->connect_nonblock) {
|
|
rc = -EALREADY;
|
|
goto out;
|
|
}
|
|
rc = kernel_connect(smc->clcsock, addr, alen, flags);
|
|
if (rc && rc != -EINPROGRESS)
|
|
goto out;
|
|
|
|
if (smc->use_fallback) {
|
|
sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
|
|
goto out;
|
|
}
|
|
sock_hold(&smc->sk); /* sock put in passive closing */
|
|
if (flags & O_NONBLOCK) {
|
|
if (queue_work(smc_hs_wq, &smc->connect_work))
|
|
smc->connect_nonblock = 1;
|
|
rc = -EINPROGRESS;
|
|
goto out;
|
|
} else {
|
|
rc = __smc_connect(smc);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
|
|
connected:
|
|
rc = 0;
|
|
sock->state = SS_CONNECTED;
|
|
out:
|
|
release_sock(sk);
|
|
out_err:
|
|
return rc;
|
|
}
|
|
|
|
static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
|
|
{
|
|
struct socket *new_clcsock = NULL;
|
|
struct sock *lsk = &lsmc->sk;
|
|
struct sock *new_sk;
|
|
int rc = -EINVAL;
|
|
|
|
release_sock(lsk);
|
|
new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
|
|
if (!new_sk) {
|
|
rc = -ENOMEM;
|
|
lsk->sk_err = ENOMEM;
|
|
*new_smc = NULL;
|
|
lock_sock(lsk);
|
|
goto out;
|
|
}
|
|
*new_smc = smc_sk(new_sk);
|
|
|
|
mutex_lock(&lsmc->clcsock_release_lock);
|
|
if (lsmc->clcsock)
|
|
rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
|
|
mutex_unlock(&lsmc->clcsock_release_lock);
|
|
lock_sock(lsk);
|
|
if (rc < 0 && rc != -EAGAIN)
|
|
lsk->sk_err = -rc;
|
|
if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
|
|
new_sk->sk_prot->unhash(new_sk);
|
|
if (new_clcsock)
|
|
sock_release(new_clcsock);
|
|
new_sk->sk_state = SMC_CLOSED;
|
|
sock_set_flag(new_sk, SOCK_DEAD);
|
|
sock_put(new_sk); /* final */
|
|
*new_smc = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* new clcsock has inherited the smc listen-specific sk_data_ready
|
|
* function; switch it back to the original sk_data_ready function
|
|
*/
|
|
new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
|
|
|
|
/* if new clcsock has also inherited the fallback-specific callback
|
|
* functions, switch them back to the original ones.
|
|
*/
|
|
if (lsmc->use_fallback) {
|
|
if (lsmc->clcsk_state_change)
|
|
new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
|
|
if (lsmc->clcsk_write_space)
|
|
new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
|
|
if (lsmc->clcsk_error_report)
|
|
new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
|
|
}
|
|
|
|
(*new_smc)->clcsock = new_clcsock;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* add a just created sock to the accept queue of the listen sock as
|
|
* candidate for a following socket accept call from user space
|
|
*/
|
|
static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
|
|
{
|
|
struct smc_sock *par = smc_sk(parent);
|
|
|
|
sock_hold(sk); /* sock_put in smc_accept_unlink () */
|
|
spin_lock(&par->accept_q_lock);
|
|
list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
|
|
spin_unlock(&par->accept_q_lock);
|
|
sk_acceptq_added(parent);
|
|
}
|
|
|
|
/* remove a socket from the accept queue of its parental listening socket */
|
|
static void smc_accept_unlink(struct sock *sk)
|
|
{
|
|
struct smc_sock *par = smc_sk(sk)->listen_smc;
|
|
|
|
spin_lock(&par->accept_q_lock);
|
|
list_del_init(&smc_sk(sk)->accept_q);
|
|
spin_unlock(&par->accept_q_lock);
|
|
sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
|
|
sock_put(sk); /* sock_hold in smc_accept_enqueue */
|
|
}
|
|
|
|
/* remove a sock from the accept queue to bind it to a new socket created
|
|
* for a socket accept call from user space
|
|
*/
|
|
struct sock *smc_accept_dequeue(struct sock *parent,
|
|
struct socket *new_sock)
|
|
{
|
|
struct smc_sock *isk, *n;
|
|
struct sock *new_sk;
|
|
|
|
list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
|
|
new_sk = (struct sock *)isk;
|
|
|
|
smc_accept_unlink(new_sk);
|
|
if (new_sk->sk_state == SMC_CLOSED) {
|
|
new_sk->sk_prot->unhash(new_sk);
|
|
if (isk->clcsock) {
|
|
sock_release(isk->clcsock);
|
|
isk->clcsock = NULL;
|
|
}
|
|
sock_put(new_sk); /* final */
|
|
continue;
|
|
}
|
|
if (new_sock) {
|
|
sock_graft(new_sk, new_sock);
|
|
new_sock->state = SS_CONNECTED;
|
|
if (isk->use_fallback) {
|
|
smc_sk(new_sk)->clcsock->file = new_sock->file;
|
|
isk->clcsock->file->private_data = isk->clcsock;
|
|
}
|
|
}
|
|
return new_sk;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* clean up for a created but never accepted sock */
|
|
void smc_close_non_accepted(struct sock *sk)
|
|
{
|
|
struct smc_sock *smc = smc_sk(sk);
|
|
|
|
sock_hold(sk); /* sock_put below */
|
|
lock_sock(sk);
|
|
if (!sk->sk_lingertime)
|
|
/* wait for peer closing */
|
|
sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
|
|
__smc_release(smc);
|
|
release_sock(sk);
|
|
sock_put(sk); /* sock_hold above */
|
|
sock_put(sk); /* final sock_put */
|
|
}
|
|
|
|
static int smcr_serv_conf_first_link(struct smc_sock *smc)
|
|
{
|
|
struct smc_link *link = smc->conn.lnk;
|
|
struct smc_llc_qentry *qentry;
|
|
int rc;
|
|
|
|
if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
|
|
return SMC_CLC_DECL_ERR_REGRMB;
|
|
|
|
/* send CONFIRM LINK request to client over the RoCE fabric */
|
|
rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
|
|
if (rc < 0)
|
|
return SMC_CLC_DECL_TIMEOUT_CL;
|
|
|
|
/* receive CONFIRM LINK response from client over the RoCE fabric */
|
|
qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
|
|
SMC_LLC_CONFIRM_LINK);
|
|
if (!qentry) {
|
|
struct smc_clc_msg_decline dclc;
|
|
|
|
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
|
|
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
|
|
return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
|
|
}
|
|
smc_llc_save_peer_uid(qentry);
|
|
rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
|
|
smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
|
|
if (rc)
|
|
return SMC_CLC_DECL_RMBE_EC;
|
|
|
|
/* confirm_rkey is implicit on 1st contact */
|
|
smc->conn.rmb_desc->is_conf_rkey = true;
|
|
|
|
smc_llc_link_active(link);
|
|
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
|
|
|
|
/* initial contact - try to establish second link */
|
|
smc_llc_srv_add_link(link, NULL);
|
|
return 0;
|
|
}
|
|
|
|
/* listen worker: finish */
|
|
static void smc_listen_out(struct smc_sock *new_smc)
|
|
{
|
|
struct smc_sock *lsmc = new_smc->listen_smc;
|
|
struct sock *newsmcsk = &new_smc->sk;
|
|
|
|
if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
|
|
atomic_dec(&lsmc->queued_smc_hs);
|
|
|
|
if (lsmc->sk.sk_state == SMC_LISTEN) {
|
|
lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
|
|
smc_accept_enqueue(&lsmc->sk, newsmcsk);
|
|
release_sock(&lsmc->sk);
|
|
} else { /* no longer listening */
|
|
smc_close_non_accepted(newsmcsk);
|
|
}
|
|
|
|
/* Wake up accept */
|
|
lsmc->sk.sk_data_ready(&lsmc->sk);
|
|
sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
|
|
}
|
|
|
|
/* listen worker: finish in state connected */
|
|
static void smc_listen_out_connected(struct smc_sock *new_smc)
|
|
{
|
|
struct sock *newsmcsk = &new_smc->sk;
|
|
|
|
sk_refcnt_debug_inc(newsmcsk);
|
|
if (newsmcsk->sk_state == SMC_INIT)
|
|
newsmcsk->sk_state = SMC_ACTIVE;
|
|
|
|
smc_listen_out(new_smc);
|
|
}
|
|
|
|
/* listen worker: finish in error state */
|
|
static void smc_listen_out_err(struct smc_sock *new_smc)
|
|
{
|
|
struct sock *newsmcsk = &new_smc->sk;
|
|
struct net *net = sock_net(newsmcsk);
|
|
|
|
this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
|
|
if (newsmcsk->sk_state == SMC_INIT)
|
|
sock_put(&new_smc->sk); /* passive closing */
|
|
newsmcsk->sk_state = SMC_CLOSED;
|
|
|
|
smc_listen_out(new_smc);
|
|
}
|
|
|
|
/* listen worker: decline and fall back if possible */
|
|
static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
|
|
int local_first, u8 version)
|
|
{
|
|
/* RDMA setup failed, switch back to TCP */
|
|
smc_conn_abort(new_smc, local_first);
|
|
if (reason_code < 0 ||
|
|
smc_switch_to_fallback(new_smc, reason_code)) {
|
|
/* error, no fallback possible */
|
|
smc_listen_out_err(new_smc);
|
|
return;
|
|
}
|
|
if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
|
|
if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
|
|
smc_listen_out_err(new_smc);
|
|
return;
|
|
}
|
|
}
|
|
smc_listen_out_connected(new_smc);
|
|
}
|
|
|
|
/* listen worker: version checking */
|
|
static int smc_listen_v2_check(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
|
|
struct smc_clc_v2_extension *pclc_v2_ext;
|
|
int rc = SMC_CLC_DECL_PEERNOSMC;
|
|
|
|
ini->smc_type_v1 = pclc->hdr.typev1;
|
|
ini->smc_type_v2 = pclc->hdr.typev2;
|
|
ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
|
|
ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
|
|
if (pclc->hdr.version > SMC_V1) {
|
|
if (smcd_indicated(ini->smc_type_v2))
|
|
ini->smcd_version |= SMC_V2;
|
|
if (smcr_indicated(ini->smc_type_v2))
|
|
ini->smcr_version |= SMC_V2;
|
|
}
|
|
if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
|
|
rc = SMC_CLC_DECL_PEERNOSMC;
|
|
goto out;
|
|
}
|
|
pclc_v2_ext = smc_get_clc_v2_ext(pclc);
|
|
if (!pclc_v2_ext) {
|
|
ini->smcd_version &= ~SMC_V2;
|
|
ini->smcr_version &= ~SMC_V2;
|
|
rc = SMC_CLC_DECL_NOV2EXT;
|
|
goto out;
|
|
}
|
|
pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
|
|
if (ini->smcd_version & SMC_V2) {
|
|
if (!smc_ism_is_v2_capable()) {
|
|
ini->smcd_version &= ~SMC_V2;
|
|
rc = SMC_CLC_DECL_NOISM2SUPP;
|
|
} else if (!pclc_smcd_v2_ext) {
|
|
ini->smcd_version &= ~SMC_V2;
|
|
rc = SMC_CLC_DECL_NOV2DEXT;
|
|
} else if (!pclc_v2_ext->hdr.eid_cnt &&
|
|
!pclc_v2_ext->hdr.flag.seid) {
|
|
ini->smcd_version &= ~SMC_V2;
|
|
rc = SMC_CLC_DECL_NOUEID;
|
|
}
|
|
}
|
|
if (ini->smcr_version & SMC_V2) {
|
|
if (!pclc_v2_ext->hdr.eid_cnt) {
|
|
ini->smcr_version &= ~SMC_V2;
|
|
rc = SMC_CLC_DECL_NOUEID;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (!ini->smcd_version && !ini->smcr_version)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* listen worker: check prefixes */
|
|
static int smc_listen_prfx_check(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc)
|
|
{
|
|
struct smc_clc_msg_proposal_prefix *pclc_prfx;
|
|
struct socket *newclcsock = new_smc->clcsock;
|
|
|
|
if (pclc->hdr.typev1 == SMC_TYPE_N)
|
|
return 0;
|
|
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
|
|
if (smc_clc_prfx_match(newclcsock, pclc_prfx))
|
|
return SMC_CLC_DECL_DIFFPREFIX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* listen worker: initialize connection and buffers */
|
|
static int smc_listen_rdma_init(struct smc_sock *new_smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc;
|
|
|
|
/* allocate connection / link group */
|
|
rc = smc_conn_create(new_smc, ini);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* create send buffer and rmb */
|
|
if (smc_buf_create(new_smc, false))
|
|
return SMC_CLC_DECL_MEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* listen worker: initialize connection and buffers for SMC-D */
|
|
static int smc_listen_ism_init(struct smc_sock *new_smc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc;
|
|
|
|
rc = smc_conn_create(new_smc, ini);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Create send and receive buffers */
|
|
rc = smc_buf_create(new_smc, true);
|
|
if (rc) {
|
|
smc_conn_abort(new_smc, ini->first_contact_local);
|
|
return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
|
|
SMC_CLC_DECL_MEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool smc_is_already_selected(struct smcd_dev *smcd,
|
|
struct smc_init_info *ini,
|
|
int matches)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < matches; i++)
|
|
if (smcd == ini->ism_dev[i])
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* check for ISM devices matching proposed ISM devices */
|
|
static void smc_check_ism_v2_match(struct smc_init_info *ini,
|
|
u16 proposed_chid, u64 proposed_gid,
|
|
unsigned int *matches)
|
|
{
|
|
struct smcd_dev *smcd;
|
|
|
|
list_for_each_entry(smcd, &smcd_dev_list.list, list) {
|
|
if (smcd->going_away)
|
|
continue;
|
|
if (smc_is_already_selected(smcd, ini, *matches))
|
|
continue;
|
|
if (smc_ism_get_chid(smcd) == proposed_chid &&
|
|
!smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
|
|
ini->ism_peer_gid[*matches] = proposed_gid;
|
|
ini->ism_dev[*matches] = smcd;
|
|
(*matches)++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
|
|
{
|
|
if (!ini->rc)
|
|
ini->rc = rc;
|
|
}
|
|
|
|
static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_clc_smcd_v2_extension *smcd_v2_ext;
|
|
struct smc_clc_v2_extension *smc_v2_ext;
|
|
struct smc_clc_msg_smcd *pclc_smcd;
|
|
unsigned int matches = 0;
|
|
u8 smcd_version;
|
|
u8 *eid = NULL;
|
|
int i, rc;
|
|
|
|
if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
|
|
goto not_found;
|
|
|
|
pclc_smcd = smc_get_clc_msg_smcd(pclc);
|
|
smc_v2_ext = smc_get_clc_v2_ext(pclc);
|
|
smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
|
|
|
|
mutex_lock(&smcd_dev_list.mutex);
|
|
if (pclc_smcd->ism.chid)
|
|
/* check for ISM device matching proposed native ISM device */
|
|
smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
|
|
ntohll(pclc_smcd->ism.gid), &matches);
|
|
for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
|
|
/* check for ISM devices matching proposed non-native ISM
|
|
* devices
|
|
*/
|
|
smc_check_ism_v2_match(ini,
|
|
ntohs(smcd_v2_ext->gidchid[i - 1].chid),
|
|
ntohll(smcd_v2_ext->gidchid[i - 1].gid),
|
|
&matches);
|
|
}
|
|
mutex_unlock(&smcd_dev_list.mutex);
|
|
|
|
if (!ini->ism_dev[0]) {
|
|
smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
|
|
goto not_found;
|
|
}
|
|
|
|
smc_ism_get_system_eid(&eid);
|
|
if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
|
|
smcd_v2_ext->system_eid, eid))
|
|
goto not_found;
|
|
|
|
/* separate - outside the smcd_dev_list.lock */
|
|
smcd_version = ini->smcd_version;
|
|
for (i = 0; i < matches; i++) {
|
|
ini->smcd_version = SMC_V2;
|
|
ini->is_smcd = true;
|
|
ini->ism_selected = i;
|
|
rc = smc_listen_ism_init(new_smc, ini);
|
|
if (rc) {
|
|
smc_find_ism_store_rc(rc, ini);
|
|
/* try next active ISM device */
|
|
continue;
|
|
}
|
|
return; /* matching and usable V2 ISM device found */
|
|
}
|
|
/* no V2 ISM device could be initialized */
|
|
ini->smcd_version = smcd_version; /* restore original value */
|
|
ini->negotiated_eid[0] = 0;
|
|
|
|
not_found:
|
|
ini->smcd_version &= ~SMC_V2;
|
|
ini->ism_dev[0] = NULL;
|
|
ini->is_smcd = false;
|
|
}
|
|
|
|
static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
|
|
int rc = 0;
|
|
|
|
/* check if ISM V1 is available */
|
|
if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
|
|
goto not_found;
|
|
ini->is_smcd = true; /* prepare ISM check */
|
|
ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
|
|
rc = smc_find_ism_device(new_smc, ini);
|
|
if (rc)
|
|
goto not_found;
|
|
ini->ism_selected = 0;
|
|
rc = smc_listen_ism_init(new_smc, ini);
|
|
if (!rc)
|
|
return; /* V1 ISM device found */
|
|
|
|
not_found:
|
|
smc_find_ism_store_rc(rc, ini);
|
|
ini->smcd_version &= ~SMC_V1;
|
|
ini->ism_dev[0] = NULL;
|
|
ini->is_smcd = false;
|
|
}
|
|
|
|
/* listen worker: register buffers */
|
|
static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
|
|
{
|
|
struct smc_connection *conn = &new_smc->conn;
|
|
|
|
if (!local_first) {
|
|
if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
|
|
return SMC_CLC_DECL_ERR_REGRMB;
|
|
}
|
|
smc_rmb_sync_sg_for_device(&new_smc->conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_clc_v2_extension *smc_v2_ext;
|
|
u8 smcr_version;
|
|
int rc;
|
|
|
|
if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
|
|
goto not_found;
|
|
|
|
smc_v2_ext = smc_get_clc_v2_ext(pclc);
|
|
if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
|
|
goto not_found;
|
|
|
|
/* prepare RDMA check */
|
|
memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
|
|
memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
|
|
memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
|
|
ini->check_smcrv2 = true;
|
|
ini->smcrv2.clc_sk = new_smc->clcsock->sk;
|
|
ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
|
|
ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
|
|
rc = smc_find_rdma_device(new_smc, ini);
|
|
if (rc) {
|
|
smc_find_ism_store_rc(rc, ini);
|
|
goto not_found;
|
|
}
|
|
if (!ini->smcrv2.uses_gateway)
|
|
memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
|
|
|
|
smcr_version = ini->smcr_version;
|
|
ini->smcr_version = SMC_V2;
|
|
rc = smc_listen_rdma_init(new_smc, ini);
|
|
if (!rc)
|
|
rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
|
|
if (!rc)
|
|
return;
|
|
ini->smcr_version = smcr_version;
|
|
smc_find_ism_store_rc(rc, ini);
|
|
|
|
not_found:
|
|
ini->smcr_version &= ~SMC_V2;
|
|
ini->smcrv2.ib_dev_v2 = NULL;
|
|
ini->check_smcrv2 = false;
|
|
}
|
|
|
|
static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int rc;
|
|
|
|
if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
|
|
return SMC_CLC_DECL_NOSMCDEV;
|
|
|
|
/* prepare RDMA check */
|
|
memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
|
|
memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
|
|
memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
|
|
rc = smc_find_rdma_device(new_smc, ini);
|
|
if (rc) {
|
|
/* no RDMA device found */
|
|
return SMC_CLC_DECL_NOSMCDEV;
|
|
}
|
|
rc = smc_listen_rdma_init(new_smc, ini);
|
|
if (rc)
|
|
return rc;
|
|
return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
|
|
}
|
|
|
|
/* determine the local device matching to proposal */
|
|
static int smc_listen_find_device(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_proposal *pclc,
|
|
struct smc_init_info *ini)
|
|
{
|
|
int prfx_rc;
|
|
|
|
/* check for ISM device matching V2 proposed device */
|
|
smc_find_ism_v2_device_serv(new_smc, pclc, ini);
|
|
if (ini->ism_dev[0])
|
|
return 0;
|
|
|
|
/* check for matching IP prefix and subnet length (V1) */
|
|
prfx_rc = smc_listen_prfx_check(new_smc, pclc);
|
|
if (prfx_rc)
|
|
smc_find_ism_store_rc(prfx_rc, ini);
|
|
|
|
/* get vlan id from IP device */
|
|
if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
|
|
return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
|
|
|
|
/* check for ISM device matching V1 proposed device */
|
|
if (!prfx_rc)
|
|
smc_find_ism_v1_device_serv(new_smc, pclc, ini);
|
|
if (ini->ism_dev[0])
|
|
return 0;
|
|
|
|
if (!smcr_indicated(pclc->hdr.typev1) &&
|
|
!smcr_indicated(pclc->hdr.typev2))
|
|
/* skip RDMA and decline */
|
|
return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
|
|
|
|
/* check if RDMA V2 is available */
|
|
smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
|
|
if (ini->smcrv2.ib_dev_v2)
|
|
return 0;
|
|
|
|
/* check if RDMA V1 is available */
|
|
if (!prfx_rc) {
|
|
int rc;
|
|
|
|
rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
|
|
smc_find_ism_store_rc(rc, ini);
|
|
return (!rc) ? 0 : ini->rc;
|
|
}
|
|
return SMC_CLC_DECL_NOSMCDEV;
|
|
}
|
|
|
|
/* listen worker: finish RDMA setup */
|
|
static int smc_listen_rdma_finish(struct smc_sock *new_smc,
|
|
struct smc_clc_msg_accept_confirm *cclc,
|
|
bool local_first,
|
|
struct smc_init_info *ini)
|
|
{
|
|
struct smc_link *link = new_smc->conn.lnk;
|
|
int reason_code = 0;
|
|
|
|
if (local_first)
|
|
smc_link_save_peer_info(link, cclc, ini);
|
|
|
|
if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
|
|
return SMC_CLC_DECL_ERR_RTOK;
|
|
|
|
if (local_first) {
|
|
if (smc_ib_ready_link(link))
|
|
return SMC_CLC_DECL_ERR_RDYLNK;
|
|
/* QP confirmation over RoCE fabric */
|
|
smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
|
|
reason_code = smcr_serv_conf_first_link(new_smc);
|
|
smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
|
|
}
|
|
return reason_code;
|
|
}
|
|
|
|
/* setup for connection of server */
|
|
static void smc_listen_work(struct work_struct *work)
|
|
{
|
|
struct smc_sock *new_smc = container_of(work, struct smc_sock,
|
|
smc_listen_work);
|
|
struct socket *newclcsock = new_smc->clcsock;
|
|
struct smc_clc_msg_accept_confirm *cclc;
|
|
struct smc_clc_msg_proposal_area *buf;
|
|
struct smc_clc_msg_proposal *pclc;
|
|
struct smc_init_info *ini = NULL;
|
|
u8 proposal_version = SMC_V1;
|
|
u8 accept_version;
|
|
int rc = 0;
|
|
|
|
if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
|
|
return smc_listen_out_err(new_smc);
|
|
|
|
if (new_smc->use_fallback) {
|
|
smc_listen_out_connected(new_smc);
|
|
return;
|
|
}
|
|
|
|
/* check if peer is smc capable */
|
|
if (!tcp_sk(newclcsock->sk)->syn_smc) {
|
|
rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
|
|
if (rc)
|
|
smc_listen_out_err(new_smc);
|
|
else
|
|
smc_listen_out_connected(new_smc);
|
|
return;
|
|
}
|
|
|
|
/* do inband token exchange -
|
|
* wait for and receive SMC Proposal CLC message
|
|
*/
|
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = SMC_CLC_DECL_MEM;
|
|
goto out_decl;
|
|
}
|
|
pclc = (struct smc_clc_msg_proposal *)buf;
|
|
rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
|
|
SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
|
|
if (rc)
|
|
goto out_decl;
|
|
|
|
if (pclc->hdr.version > SMC_V1)
|
|
proposal_version = SMC_V2;
|
|
|
|
/* IPSec connections opt out of SMC optimizations */
|
|
if (using_ipsec(new_smc)) {
|
|
rc = SMC_CLC_DECL_IPSEC;
|
|
goto out_decl;
|
|
}
|
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL);
|
|
if (!ini) {
|
|
rc = SMC_CLC_DECL_MEM;
|
|
goto out_decl;
|
|
}
|
|
|
|
/* initial version checking */
|
|
rc = smc_listen_v2_check(new_smc, pclc, ini);
|
|
if (rc)
|
|
goto out_decl;
|
|
|
|
mutex_lock(&smc_server_lgr_pending);
|
|
smc_close_init(new_smc);
|
|
smc_rx_init(new_smc);
|
|
smc_tx_init(new_smc);
|
|
|
|
/* determine ISM or RoCE device used for connection */
|
|
rc = smc_listen_find_device(new_smc, pclc, ini);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
/* send SMC Accept CLC message */
|
|
accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
|
|
rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
|
|
accept_version, ini->negotiated_eid);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
/* SMC-D does not need this lock any more */
|
|
if (ini->is_smcd)
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
|
|
/* receive SMC Confirm CLC message */
|
|
memset(buf, 0, sizeof(*buf));
|
|
cclc = (struct smc_clc_msg_accept_confirm *)buf;
|
|
rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
|
|
SMC_CLC_CONFIRM, CLC_WAIT_TIME);
|
|
if (rc) {
|
|
if (!ini->is_smcd)
|
|
goto out_unlock;
|
|
goto out_decl;
|
|
}
|
|
|
|
/* finish worker */
|
|
if (!ini->is_smcd) {
|
|
rc = smc_listen_rdma_finish(new_smc, cclc,
|
|
ini->first_contact_local, ini);
|
|
if (rc)
|
|
goto out_unlock;
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
}
|
|
smc_conn_save_peer_info(new_smc, cclc);
|
|
smc_listen_out_connected(new_smc);
|
|
SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
|
|
goto out_free;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&smc_server_lgr_pending);
|
|
out_decl:
|
|
smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
|
|
proposal_version);
|
|
out_free:
|
|
kfree(ini);
|
|
kfree(buf);
|
|
}
|
|
|
|
static void smc_tcp_listen_work(struct work_struct *work)
|
|
{
|
|
struct smc_sock *lsmc = container_of(work, struct smc_sock,
|
|
tcp_listen_work);
|
|
struct sock *lsk = &lsmc->sk;
|
|
struct smc_sock *new_smc;
|
|
int rc = 0;
|
|
|
|
lock_sock(lsk);
|
|
while (lsk->sk_state == SMC_LISTEN) {
|
|
rc = smc_clcsock_accept(lsmc, &new_smc);
|
|
if (rc) /* clcsock accept queue empty or error */
|
|
goto out;
|
|
if (!new_smc)
|
|
continue;
|
|
|
|
if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
|
|
atomic_inc(&lsmc->queued_smc_hs);
|
|
|
|
new_smc->listen_smc = lsmc;
|
|
new_smc->use_fallback = lsmc->use_fallback;
|
|
new_smc->fallback_rsn = lsmc->fallback_rsn;
|
|
sock_hold(lsk); /* sock_put in smc_listen_work */
|
|
INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
|
|
smc_copy_sock_settings_to_smc(new_smc);
|
|
new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
|
|
new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
|
|
sock_hold(&new_smc->sk); /* sock_put in passive closing */
|
|
if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
|
|
sock_put(&new_smc->sk);
|
|
}
|
|
|
|
out:
|
|
release_sock(lsk);
|
|
sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
|
|
}
|
|
|
|
static void smc_clcsock_data_ready(struct sock *listen_clcsock)
|
|
{
|
|
struct smc_sock *lsmc;
|
|
|
|
read_lock_bh(&listen_clcsock->sk_callback_lock);
|
|
lsmc = smc_clcsock_user_data(listen_clcsock);
|
|
if (!lsmc)
|
|
goto out;
|
|
lsmc->clcsk_data_ready(listen_clcsock);
|
|
if (lsmc->sk.sk_state == SMC_LISTEN) {
|
|
sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
|
|
if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
|
|
sock_put(&lsmc->sk);
|
|
}
|
|
out:
|
|
read_unlock_bh(&listen_clcsock->sk_callback_lock);
|
|
}
|
|
|
|
static int smc_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc;
|
|
|
|
smc = smc_sk(sk);
|
|
lock_sock(sk);
|
|
|
|
rc = -EINVAL;
|
|
if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
|
|
smc->connect_nonblock || sock->state != SS_UNCONNECTED)
|
|
goto out;
|
|
|
|
rc = 0;
|
|
if (sk->sk_state == SMC_LISTEN) {
|
|
sk->sk_max_ack_backlog = backlog;
|
|
goto out;
|
|
}
|
|
/* some socket options are handled in core, so we could not apply
|
|
* them to the clc socket -- copy smc socket options to clc socket
|
|
*/
|
|
smc_copy_sock_settings_to_clc(smc);
|
|
if (!smc->use_fallback)
|
|
tcp_sk(smc->clcsock->sk)->syn_smc = 1;
|
|
|
|
/* save original sk_data_ready function and establish
|
|
* smc-specific sk_data_ready function
|
|
*/
|
|
write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
|
|
smc->clcsock->sk->sk_user_data =
|
|
(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
|
|
smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
|
|
smc_clcsock_data_ready, &smc->clcsk_data_ready);
|
|
write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
|
|
|
|
/* save original ops */
|
|
smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
|
|
|
|
smc->af_ops = *smc->ori_af_ops;
|
|
smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
|
|
|
|
inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
|
|
|
|
if (smc->limit_smc_hs)
|
|
tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
|
|
|
|
rc = kernel_listen(smc->clcsock, backlog);
|
|
if (rc) {
|
|
write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
|
|
smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
|
|
&smc->clcsk_data_ready);
|
|
smc->clcsock->sk->sk_user_data = NULL;
|
|
write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
|
|
goto out;
|
|
}
|
|
sk->sk_max_ack_backlog = backlog;
|
|
sk->sk_ack_backlog = 0;
|
|
sk->sk_state = SMC_LISTEN;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
static int smc_accept(struct socket *sock, struct socket *new_sock,
|
|
int flags, bool kern)
|
|
{
|
|
struct sock *sk = sock->sk, *nsk;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct smc_sock *lsmc;
|
|
long timeo;
|
|
int rc = 0;
|
|
|
|
lsmc = smc_sk(sk);
|
|
sock_hold(sk); /* sock_put below */
|
|
lock_sock(sk);
|
|
|
|
if (lsmc->sk.sk_state != SMC_LISTEN) {
|
|
rc = -EINVAL;
|
|
release_sock(sk);
|
|
goto out;
|
|
}
|
|
|
|
/* Wait for an incoming connection */
|
|
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
|
|
add_wait_queue_exclusive(sk_sleep(sk), &wait);
|
|
while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!timeo) {
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
/* wakeup by sk_data_ready in smc_listen_work() */
|
|
sched_annotate_sleep();
|
|
lock_sock(sk);
|
|
if (signal_pending(current)) {
|
|
rc = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
|
|
if (!rc)
|
|
rc = sock_error(nsk);
|
|
release_sock(sk);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
|
|
/* wait till data arrives on the socket */
|
|
timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
|
|
MSEC_PER_SEC);
|
|
if (smc_sk(nsk)->use_fallback) {
|
|
struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
|
|
|
|
lock_sock(clcsk);
|
|
if (skb_queue_empty(&clcsk->sk_receive_queue))
|
|
sk_wait_data(clcsk, &timeo, NULL);
|
|
release_sock(clcsk);
|
|
} else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
|
|
lock_sock(nsk);
|
|
smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
|
|
release_sock(nsk);
|
|
}
|
|
}
|
|
|
|
out:
|
|
sock_put(sk); /* sock_hold above */
|
|
return rc;
|
|
}
|
|
|
|
static int smc_getname(struct socket *sock, struct sockaddr *addr,
|
|
int peer)
|
|
{
|
|
struct smc_sock *smc;
|
|
|
|
if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
|
|
(sock->sk->sk_state != SMC_APPCLOSEWAIT1))
|
|
return -ENOTCONN;
|
|
|
|
smc = smc_sk(sock->sk);
|
|
|
|
return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
|
|
}
|
|
|
|
static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc = -EPIPE;
|
|
|
|
smc = smc_sk(sk);
|
|
lock_sock(sk);
|
|
if ((sk->sk_state != SMC_ACTIVE) &&
|
|
(sk->sk_state != SMC_APPCLOSEWAIT1) &&
|
|
(sk->sk_state != SMC_INIT))
|
|
goto out;
|
|
|
|
if (msg->msg_flags & MSG_FASTOPEN) {
|
|
if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
|
|
rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
|
|
if (rc)
|
|
goto out;
|
|
} else {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (smc->use_fallback) {
|
|
rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
|
|
} else {
|
|
rc = smc_tx_sendmsg(smc, msg, len);
|
|
SMC_STAT_TX_PAYLOAD(smc, len, rc);
|
|
}
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc = -ENOTCONN;
|
|
|
|
smc = smc_sk(sk);
|
|
lock_sock(sk);
|
|
if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
|
|
/* socket was connected before, no more data to read */
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
if ((sk->sk_state == SMC_INIT) ||
|
|
(sk->sk_state == SMC_LISTEN) ||
|
|
(sk->sk_state == SMC_CLOSED))
|
|
goto out;
|
|
|
|
if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (smc->use_fallback) {
|
|
rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
|
|
} else {
|
|
msg->msg_namelen = 0;
|
|
rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
|
|
SMC_STAT_RX_PAYLOAD(smc, rc, rc);
|
|
}
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
static __poll_t smc_accept_poll(struct sock *parent)
|
|
{
|
|
struct smc_sock *isk = smc_sk(parent);
|
|
__poll_t mask = 0;
|
|
|
|
spin_lock(&isk->accept_q_lock);
|
|
if (!list_empty(&isk->accept_q))
|
|
mask = EPOLLIN | EPOLLRDNORM;
|
|
spin_unlock(&isk->accept_q_lock);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static __poll_t smc_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
__poll_t mask = 0;
|
|
|
|
if (!sk)
|
|
return EPOLLNVAL;
|
|
|
|
smc = smc_sk(sock->sk);
|
|
if (smc->use_fallback) {
|
|
/* delegate to CLC child sock */
|
|
mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
|
|
sk->sk_err = smc->clcsock->sk->sk_err;
|
|
} else {
|
|
if (sk->sk_state != SMC_CLOSED)
|
|
sock_poll_wait(file, sock, wait);
|
|
if (sk->sk_err)
|
|
mask |= EPOLLERR;
|
|
if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
|
|
(sk->sk_state == SMC_CLOSED))
|
|
mask |= EPOLLHUP;
|
|
if (sk->sk_state == SMC_LISTEN) {
|
|
/* woken up by sk_data_ready in smc_listen_work() */
|
|
mask |= smc_accept_poll(sk);
|
|
} else if (smc->use_fallback) { /* as result of connect_work()*/
|
|
mask |= smc->clcsock->ops->poll(file, smc->clcsock,
|
|
wait);
|
|
sk->sk_err = smc->clcsock->sk->sk_err;
|
|
} else {
|
|
if ((sk->sk_state != SMC_INIT &&
|
|
atomic_read(&smc->conn.sndbuf_space)) ||
|
|
sk->sk_shutdown & SEND_SHUTDOWN) {
|
|
mask |= EPOLLOUT | EPOLLWRNORM;
|
|
} else {
|
|
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
}
|
|
if (atomic_read(&smc->conn.bytes_to_rcv))
|
|
mask |= EPOLLIN | EPOLLRDNORM;
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
|
|
if (sk->sk_state == SMC_APPCLOSEWAIT1)
|
|
mask |= EPOLLIN;
|
|
if (smc->conn.urg_state == SMC_URG_VALID)
|
|
mask |= EPOLLPRI;
|
|
}
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int smc_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
bool do_shutdown = true;
|
|
struct smc_sock *smc;
|
|
int rc = -EINVAL;
|
|
int old_state;
|
|
int rc1 = 0;
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
if ((how < SHUT_RD) || (how > SHUT_RDWR))
|
|
return rc;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock->state == SS_CONNECTING) {
|
|
if (sk->sk_state == SMC_ACTIVE)
|
|
sock->state = SS_CONNECTED;
|
|
else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
|
|
sk->sk_state == SMC_PEERCLOSEWAIT2 ||
|
|
sk->sk_state == SMC_APPCLOSEWAIT1 ||
|
|
sk->sk_state == SMC_APPCLOSEWAIT2 ||
|
|
sk->sk_state == SMC_APPFINCLOSEWAIT)
|
|
sock->state = SS_DISCONNECTING;
|
|
}
|
|
|
|
rc = -ENOTCONN;
|
|
if ((sk->sk_state != SMC_ACTIVE) &&
|
|
(sk->sk_state != SMC_PEERCLOSEWAIT1) &&
|
|
(sk->sk_state != SMC_PEERCLOSEWAIT2) &&
|
|
(sk->sk_state != SMC_APPCLOSEWAIT1) &&
|
|
(sk->sk_state != SMC_APPCLOSEWAIT2) &&
|
|
(sk->sk_state != SMC_APPFINCLOSEWAIT))
|
|
goto out;
|
|
if (smc->use_fallback) {
|
|
rc = kernel_sock_shutdown(smc->clcsock, how);
|
|
sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
|
|
if (sk->sk_shutdown == SHUTDOWN_MASK) {
|
|
sk->sk_state = SMC_CLOSED;
|
|
sk->sk_socket->state = SS_UNCONNECTED;
|
|
sock_put(sk);
|
|
}
|
|
goto out;
|
|
}
|
|
switch (how) {
|
|
case SHUT_RDWR: /* shutdown in both directions */
|
|
old_state = sk->sk_state;
|
|
rc = smc_close_active(smc);
|
|
if (old_state == SMC_ACTIVE &&
|
|
sk->sk_state == SMC_PEERCLOSEWAIT1)
|
|
do_shutdown = false;
|
|
break;
|
|
case SHUT_WR:
|
|
rc = smc_close_shutdown_write(smc);
|
|
break;
|
|
case SHUT_RD:
|
|
rc = 0;
|
|
/* nothing more to do because peer is not involved */
|
|
break;
|
|
}
|
|
if (do_shutdown && smc->clcsock)
|
|
rc1 = kernel_sock_shutdown(smc->clcsock, how);
|
|
/* map sock_shutdown_cmd constants to sk_shutdown value range */
|
|
sk->sk_shutdown |= how + 1;
|
|
|
|
if (sk->sk_state == SMC_CLOSED)
|
|
sock->state = SS_UNCONNECTED;
|
|
else
|
|
sock->state = SS_DISCONNECTING;
|
|
out:
|
|
release_sock(sk);
|
|
return rc ? rc : rc1;
|
|
}
|
|
|
|
static int __smc_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct smc_sock *smc;
|
|
int val, len;
|
|
|
|
smc = smc_sk(sock->sk);
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
len = min_t(int, len, sizeof(int));
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case SMC_LIMIT_HS:
|
|
val = smc->limit_smc_hs;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __smc_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int val, rc;
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
lock_sock(sk);
|
|
switch (optname) {
|
|
case SMC_LIMIT_HS:
|
|
if (optlen < sizeof(int)) {
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&val, optval, sizeof(int))) {
|
|
rc = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
smc->limit_smc_hs = !!val;
|
|
rc = 0;
|
|
break;
|
|
default:
|
|
rc = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int smc_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int val, rc;
|
|
|
|
if (level == SOL_TCP && optname == TCP_ULP)
|
|
return -EOPNOTSUPP;
|
|
else if (level == SOL_SMC)
|
|
return __smc_setsockopt(sock, level, optname, optval, optlen);
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
/* generic setsockopts reaching us here always apply to the
|
|
* CLC socket
|
|
*/
|
|
mutex_lock(&smc->clcsock_release_lock);
|
|
if (!smc->clcsock) {
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
return -EBADF;
|
|
}
|
|
if (unlikely(!smc->clcsock->ops->setsockopt))
|
|
rc = -EOPNOTSUPP;
|
|
else
|
|
rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
|
|
optval, optlen);
|
|
if (smc->clcsock->sk->sk_err) {
|
|
sk->sk_err = smc->clcsock->sk->sk_err;
|
|
sk_error_report(sk);
|
|
}
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
if (copy_from_sockptr(&val, optval, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
if (rc || smc->use_fallback)
|
|
goto out;
|
|
switch (optname) {
|
|
case TCP_FASTOPEN:
|
|
case TCP_FASTOPEN_CONNECT:
|
|
case TCP_FASTOPEN_KEY:
|
|
case TCP_FASTOPEN_NO_COOKIE:
|
|
/* option not supported by SMC */
|
|
if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
|
|
rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
|
|
} else {
|
|
rc = -EINVAL;
|
|
}
|
|
break;
|
|
case TCP_NODELAY:
|
|
if (sk->sk_state != SMC_INIT &&
|
|
sk->sk_state != SMC_LISTEN &&
|
|
sk->sk_state != SMC_CLOSED) {
|
|
if (val) {
|
|
SMC_STAT_INC(smc, ndly_cnt);
|
|
smc_tx_pending(&smc->conn);
|
|
cancel_delayed_work(&smc->conn.tx_work);
|
|
}
|
|
}
|
|
break;
|
|
case TCP_CORK:
|
|
if (sk->sk_state != SMC_INIT &&
|
|
sk->sk_state != SMC_LISTEN &&
|
|
sk->sk_state != SMC_CLOSED) {
|
|
if (!val) {
|
|
SMC_STAT_INC(smc, cork_cnt);
|
|
smc_tx_pending(&smc->conn);
|
|
cancel_delayed_work(&smc->conn.tx_work);
|
|
}
|
|
}
|
|
break;
|
|
case TCP_DEFER_ACCEPT:
|
|
smc->sockopt_defer_accept = val;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
out:
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int smc_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct smc_sock *smc;
|
|
int rc;
|
|
|
|
if (level == SOL_SMC)
|
|
return __smc_getsockopt(sock, level, optname, optval, optlen);
|
|
|
|
smc = smc_sk(sock->sk);
|
|
mutex_lock(&smc->clcsock_release_lock);
|
|
if (!smc->clcsock) {
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
return -EBADF;
|
|
}
|
|
/* socket options apply to the CLC socket */
|
|
if (unlikely(!smc->clcsock->ops->getsockopt)) {
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
|
|
optval, optlen);
|
|
mutex_unlock(&smc->clcsock_release_lock);
|
|
return rc;
|
|
}
|
|
|
|
static int smc_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
union smc_host_cursor cons, urg;
|
|
struct smc_connection *conn;
|
|
struct smc_sock *smc;
|
|
int answ;
|
|
|
|
smc = smc_sk(sock->sk);
|
|
conn = &smc->conn;
|
|
lock_sock(&smc->sk);
|
|
if (smc->use_fallback) {
|
|
if (!smc->clcsock) {
|
|
release_sock(&smc->sk);
|
|
return -EBADF;
|
|
}
|
|
answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
|
|
release_sock(&smc->sk);
|
|
return answ;
|
|
}
|
|
switch (cmd) {
|
|
case SIOCINQ: /* same as FIONREAD */
|
|
if (smc->sk.sk_state == SMC_LISTEN) {
|
|
release_sock(&smc->sk);
|
|
return -EINVAL;
|
|
}
|
|
if (smc->sk.sk_state == SMC_INIT ||
|
|
smc->sk.sk_state == SMC_CLOSED)
|
|
answ = 0;
|
|
else
|
|
answ = atomic_read(&smc->conn.bytes_to_rcv);
|
|
break;
|
|
case SIOCOUTQ:
|
|
/* output queue size (not send + not acked) */
|
|
if (smc->sk.sk_state == SMC_LISTEN) {
|
|
release_sock(&smc->sk);
|
|
return -EINVAL;
|
|
}
|
|
if (smc->sk.sk_state == SMC_INIT ||
|
|
smc->sk.sk_state == SMC_CLOSED)
|
|
answ = 0;
|
|
else
|
|
answ = smc->conn.sndbuf_desc->len -
|
|
atomic_read(&smc->conn.sndbuf_space);
|
|
break;
|
|
case SIOCOUTQNSD:
|
|
/* output queue size (not send only) */
|
|
if (smc->sk.sk_state == SMC_LISTEN) {
|
|
release_sock(&smc->sk);
|
|
return -EINVAL;
|
|
}
|
|
if (smc->sk.sk_state == SMC_INIT ||
|
|
smc->sk.sk_state == SMC_CLOSED)
|
|
answ = 0;
|
|
else
|
|
answ = smc_tx_prepared_sends(&smc->conn);
|
|
break;
|
|
case SIOCATMARK:
|
|
if (smc->sk.sk_state == SMC_LISTEN) {
|
|
release_sock(&smc->sk);
|
|
return -EINVAL;
|
|
}
|
|
if (smc->sk.sk_state == SMC_INIT ||
|
|
smc->sk.sk_state == SMC_CLOSED) {
|
|
answ = 0;
|
|
} else {
|
|
smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
|
|
smc_curs_copy(&urg, &conn->urg_curs, conn);
|
|
answ = smc_curs_diff(conn->rmb_desc->len,
|
|
&cons, &urg) == 1;
|
|
}
|
|
break;
|
|
default:
|
|
release_sock(&smc->sk);
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
release_sock(&smc->sk);
|
|
|
|
return put_user(answ, (int __user *)arg);
|
|
}
|
|
|
|
static ssize_t smc_sendpage(struct socket *sock, struct page *page,
|
|
int offset, size_t size, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc = -EPIPE;
|
|
|
|
smc = smc_sk(sk);
|
|
lock_sock(sk);
|
|
if (sk->sk_state != SMC_ACTIVE) {
|
|
release_sock(sk);
|
|
goto out;
|
|
}
|
|
release_sock(sk);
|
|
if (smc->use_fallback) {
|
|
rc = kernel_sendpage(smc->clcsock, page, offset,
|
|
size, flags);
|
|
} else {
|
|
lock_sock(sk);
|
|
rc = smc_tx_sendpage(smc, page, offset, size, flags);
|
|
release_sock(sk);
|
|
SMC_STAT_INC(smc, sendpage_cnt);
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* Map the affected portions of the rmbe into an spd, note the number of bytes
|
|
* to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
|
|
* updates till whenever a respective page has been fully processed.
|
|
* Note that subsequent recv() calls have to wait till all splice() processing
|
|
* completed.
|
|
*/
|
|
static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
|
|
struct pipe_inode_info *pipe, size_t len,
|
|
unsigned int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct smc_sock *smc;
|
|
int rc = -ENOTCONN;
|
|
|
|
smc = smc_sk(sk);
|
|
lock_sock(sk);
|
|
if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
|
|
/* socket was connected before, no more data to read */
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
if (sk->sk_state == SMC_INIT ||
|
|
sk->sk_state == SMC_LISTEN ||
|
|
sk->sk_state == SMC_CLOSED)
|
|
goto out;
|
|
|
|
if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (smc->use_fallback) {
|
|
rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
|
|
pipe, len, flags);
|
|
} else {
|
|
if (*ppos) {
|
|
rc = -ESPIPE;
|
|
goto out;
|
|
}
|
|
if (flags & SPLICE_F_NONBLOCK)
|
|
flags = MSG_DONTWAIT;
|
|
else
|
|
flags = 0;
|
|
SMC_STAT_INC(smc, splice_cnt);
|
|
rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
|
|
}
|
|
out:
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* must look like tcp */
|
|
static const struct proto_ops smc_sock_ops = {
|
|
.family = PF_SMC,
|
|
.owner = THIS_MODULE,
|
|
.release = smc_release,
|
|
.bind = smc_bind,
|
|
.connect = smc_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = smc_accept,
|
|
.getname = smc_getname,
|
|
.poll = smc_poll,
|
|
.ioctl = smc_ioctl,
|
|
.listen = smc_listen,
|
|
.shutdown = smc_shutdown,
|
|
.setsockopt = smc_setsockopt,
|
|
.getsockopt = smc_getsockopt,
|
|
.sendmsg = smc_sendmsg,
|
|
.recvmsg = smc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = smc_sendpage,
|
|
.splice_read = smc_splice_read,
|
|
};
|
|
|
|
static int __smc_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern, struct socket *clcsock)
|
|
{
|
|
int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
|
|
struct smc_sock *smc;
|
|
struct sock *sk;
|
|
int rc;
|
|
|
|
rc = -ESOCKTNOSUPPORT;
|
|
if (sock->type != SOCK_STREAM)
|
|
goto out;
|
|
|
|
rc = -EPROTONOSUPPORT;
|
|
if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
|
|
goto out;
|
|
|
|
rc = -ENOBUFS;
|
|
sock->ops = &smc_sock_ops;
|
|
sock->state = SS_UNCONNECTED;
|
|
sk = smc_sock_alloc(net, sock, protocol);
|
|
if (!sk)
|
|
goto out;
|
|
|
|
/* create internal TCP socket for CLC handshake and fallback */
|
|
smc = smc_sk(sk);
|
|
smc->use_fallback = false; /* assume rdma capability first */
|
|
smc->fallback_rsn = 0;
|
|
|
|
/* default behavior from limit_smc_hs in every net namespace */
|
|
smc->limit_smc_hs = net->smc.limit_smc_hs;
|
|
|
|
rc = 0;
|
|
if (!clcsock) {
|
|
rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
|
|
&smc->clcsock);
|
|
if (rc) {
|
|
sk_common_release(sk);
|
|
goto out;
|
|
}
|
|
} else {
|
|
smc->clcsock = clcsock;
|
|
}
|
|
|
|
smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
|
|
smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int smc_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
return __smc_create(net, sock, protocol, kern, NULL);
|
|
}
|
|
|
|
static const struct net_proto_family smc_sock_family_ops = {
|
|
.family = PF_SMC,
|
|
.owner = THIS_MODULE,
|
|
.create = smc_create,
|
|
};
|
|
|
|
static int smc_ulp_init(struct sock *sk)
|
|
{
|
|
struct socket *tcp = sk->sk_socket;
|
|
struct net *net = sock_net(sk);
|
|
struct socket *smcsock;
|
|
int protocol, ret;
|
|
|
|
/* only TCP can be replaced */
|
|
if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
|
|
(sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
|
|
return -ESOCKTNOSUPPORT;
|
|
/* don't handle wq now */
|
|
if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
|
|
return -ENOTCONN;
|
|
|
|
if (sk->sk_family == AF_INET)
|
|
protocol = SMCPROTO_SMC;
|
|
else
|
|
protocol = SMCPROTO_SMC6;
|
|
|
|
smcsock = sock_alloc();
|
|
if (!smcsock)
|
|
return -ENFILE;
|
|
|
|
smcsock->type = SOCK_STREAM;
|
|
__module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
|
|
ret = __smc_create(net, smcsock, protocol, 1, tcp);
|
|
if (ret) {
|
|
sock_release(smcsock); /* module_put() which ops won't be NULL */
|
|
return ret;
|
|
}
|
|
|
|
/* replace tcp socket to smc */
|
|
smcsock->file = tcp->file;
|
|
smcsock->file->private_data = smcsock;
|
|
smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
|
|
smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
|
|
tcp->file = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
|
|
const gfp_t priority)
|
|
{
|
|
struct inet_connection_sock *icsk = inet_csk(newsk);
|
|
|
|
/* don't inherit ulp ops to child when listen */
|
|
icsk->icsk_ulp_ops = NULL;
|
|
}
|
|
|
|
static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
|
|
.name = "smc",
|
|
.owner = THIS_MODULE,
|
|
.init = smc_ulp_init,
|
|
.clone = smc_ulp_clone,
|
|
};
|
|
|
|
unsigned int smc_net_id;
|
|
|
|
static __net_init int smc_net_init(struct net *net)
|
|
{
|
|
int rc;
|
|
|
|
rc = smc_sysctl_net_init(net);
|
|
if (rc)
|
|
return rc;
|
|
return smc_pnet_net_init(net);
|
|
}
|
|
|
|
static void __net_exit smc_net_exit(struct net *net)
|
|
{
|
|
smc_sysctl_net_exit(net);
|
|
smc_pnet_net_exit(net);
|
|
}
|
|
|
|
static __net_init int smc_net_stat_init(struct net *net)
|
|
{
|
|
return smc_stats_init(net);
|
|
}
|
|
|
|
static void __net_exit smc_net_stat_exit(struct net *net)
|
|
{
|
|
smc_stats_exit(net);
|
|
}
|
|
|
|
static struct pernet_operations smc_net_ops = {
|
|
.init = smc_net_init,
|
|
.exit = smc_net_exit,
|
|
.id = &smc_net_id,
|
|
.size = sizeof(struct smc_net),
|
|
};
|
|
|
|
static struct pernet_operations smc_net_stat_ops = {
|
|
.init = smc_net_stat_init,
|
|
.exit = smc_net_stat_exit,
|
|
};
|
|
|
|
static int __init smc_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = register_pernet_subsys(&smc_net_ops);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = register_pernet_subsys(&smc_net_stat_ops);
|
|
if (rc)
|
|
return rc;
|
|
|
|
smc_ism_init();
|
|
smc_clc_init();
|
|
|
|
rc = smc_nl_init();
|
|
if (rc)
|
|
goto out_pernet_subsys;
|
|
|
|
rc = smc_pnet_init();
|
|
if (rc)
|
|
goto out_nl;
|
|
|
|
rc = -ENOMEM;
|
|
|
|
smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
|
|
if (!smc_tcp_ls_wq)
|
|
goto out_pnet;
|
|
|
|
smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
|
|
if (!smc_hs_wq)
|
|
goto out_alloc_tcp_ls_wq;
|
|
|
|
smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
|
|
if (!smc_close_wq)
|
|
goto out_alloc_hs_wq;
|
|
|
|
rc = smc_core_init();
|
|
if (rc) {
|
|
pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
|
|
goto out_alloc_wqs;
|
|
}
|
|
|
|
rc = smc_llc_init();
|
|
if (rc) {
|
|
pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
|
|
goto out_core;
|
|
}
|
|
|
|
rc = smc_cdc_init();
|
|
if (rc) {
|
|
pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
|
|
goto out_core;
|
|
}
|
|
|
|
rc = proto_register(&smc_proto, 1);
|
|
if (rc) {
|
|
pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
|
|
goto out_core;
|
|
}
|
|
|
|
rc = proto_register(&smc_proto6, 1);
|
|
if (rc) {
|
|
pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
|
|
goto out_proto;
|
|
}
|
|
|
|
rc = sock_register(&smc_sock_family_ops);
|
|
if (rc) {
|
|
pr_err("%s: sock_register fails with %d\n", __func__, rc);
|
|
goto out_proto6;
|
|
}
|
|
INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
|
|
INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
|
|
|
|
rc = smc_ib_register_client();
|
|
if (rc) {
|
|
pr_err("%s: ib_register fails with %d\n", __func__, rc);
|
|
goto out_sock;
|
|
}
|
|
|
|
rc = tcp_register_ulp(&smc_ulp_ops);
|
|
if (rc) {
|
|
pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
|
|
goto out_ib;
|
|
}
|
|
|
|
static_branch_enable(&tcp_have_smc);
|
|
return 0;
|
|
|
|
out_ib:
|
|
smc_ib_unregister_client();
|
|
out_sock:
|
|
sock_unregister(PF_SMC);
|
|
out_proto6:
|
|
proto_unregister(&smc_proto6);
|
|
out_proto:
|
|
proto_unregister(&smc_proto);
|
|
out_core:
|
|
smc_core_exit();
|
|
out_alloc_wqs:
|
|
destroy_workqueue(smc_close_wq);
|
|
out_alloc_hs_wq:
|
|
destroy_workqueue(smc_hs_wq);
|
|
out_alloc_tcp_ls_wq:
|
|
destroy_workqueue(smc_tcp_ls_wq);
|
|
out_pnet:
|
|
smc_pnet_exit();
|
|
out_nl:
|
|
smc_nl_exit();
|
|
out_pernet_subsys:
|
|
unregister_pernet_subsys(&smc_net_ops);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit smc_exit(void)
|
|
{
|
|
static_branch_disable(&tcp_have_smc);
|
|
tcp_unregister_ulp(&smc_ulp_ops);
|
|
sock_unregister(PF_SMC);
|
|
smc_core_exit();
|
|
smc_ib_unregister_client();
|
|
destroy_workqueue(smc_close_wq);
|
|
destroy_workqueue(smc_tcp_ls_wq);
|
|
destroy_workqueue(smc_hs_wq);
|
|
proto_unregister(&smc_proto6);
|
|
proto_unregister(&smc_proto);
|
|
smc_pnet_exit();
|
|
smc_nl_exit();
|
|
smc_clc_exit();
|
|
unregister_pernet_subsys(&smc_net_stat_ops);
|
|
unregister_pernet_subsys(&smc_net_ops);
|
|
rcu_barrier();
|
|
}
|
|
|
|
module_init(smc_init);
|
|
module_exit(smc_exit);
|
|
|
|
MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
|
|
MODULE_DESCRIPTION("smc socket address family");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_SMC);
|
|
MODULE_ALIAS_TCP_ULP("smc");
|