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![Hangyu Hua](/assets/img/avatar_default.png)
__rds_conn_create() did not release conn->c_path when loop_trans != 0 and
trans->t_prefer_loopback != 0 and is_outgoing == 0.
Fixes: aced3ce57c
("RDS tcp loopback connection can hang")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Sharath Srinivasan <sharath.srinivasan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
948 lines
26 KiB
C
948 lines
26 KiB
C
/*
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* Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/ipv6.h>
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#include <net/inet6_hashtables.h>
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#include <net/addrconf.h>
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#include "rds.h"
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#include "loop.h"
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#define RDS_CONNECTION_HASH_BITS 12
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#define RDS_CONNECTION_HASH_ENTRIES (1 << RDS_CONNECTION_HASH_BITS)
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#define RDS_CONNECTION_HASH_MASK (RDS_CONNECTION_HASH_ENTRIES - 1)
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/* converting this to RCU is a chore for another day.. */
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static DEFINE_SPINLOCK(rds_conn_lock);
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static unsigned long rds_conn_count;
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static struct hlist_head rds_conn_hash[RDS_CONNECTION_HASH_ENTRIES];
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static struct kmem_cache *rds_conn_slab;
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static struct hlist_head *rds_conn_bucket(const struct in6_addr *laddr,
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const struct in6_addr *faddr)
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{
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static u32 rds6_hash_secret __read_mostly;
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static u32 rds_hash_secret __read_mostly;
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u32 lhash, fhash, hash;
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net_get_random_once(&rds_hash_secret, sizeof(rds_hash_secret));
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net_get_random_once(&rds6_hash_secret, sizeof(rds6_hash_secret));
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lhash = (__force u32)laddr->s6_addr32[3];
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#if IS_ENABLED(CONFIG_IPV6)
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fhash = __ipv6_addr_jhash(faddr, rds6_hash_secret);
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#else
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fhash = (__force u32)faddr->s6_addr32[3];
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#endif
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hash = __inet_ehashfn(lhash, 0, fhash, 0, rds_hash_secret);
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return &rds_conn_hash[hash & RDS_CONNECTION_HASH_MASK];
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}
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#define rds_conn_info_set(var, test, suffix) do { \
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if (test) \
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var |= RDS_INFO_CONNECTION_FLAG_##suffix; \
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} while (0)
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/* rcu read lock must be held or the connection spinlock */
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static struct rds_connection *rds_conn_lookup(struct net *net,
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struct hlist_head *head,
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const struct in6_addr *laddr,
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const struct in6_addr *faddr,
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struct rds_transport *trans,
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u8 tos, int dev_if)
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{
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struct rds_connection *conn, *ret = NULL;
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hlist_for_each_entry_rcu(conn, head, c_hash_node) {
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if (ipv6_addr_equal(&conn->c_faddr, faddr) &&
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ipv6_addr_equal(&conn->c_laddr, laddr) &&
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conn->c_trans == trans &&
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conn->c_tos == tos &&
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net == rds_conn_net(conn) &&
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conn->c_dev_if == dev_if) {
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ret = conn;
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break;
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}
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}
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rdsdebug("returning conn %p for %pI6c -> %pI6c\n", ret,
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laddr, faddr);
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return ret;
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}
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/*
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* This is called by transports as they're bringing down a connection.
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* It clears partial message state so that the transport can start sending
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* and receiving over this connection again in the future. It is up to
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* the transport to have serialized this call with its send and recv.
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*/
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static void rds_conn_path_reset(struct rds_conn_path *cp)
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{
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struct rds_connection *conn = cp->cp_conn;
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rdsdebug("connection %pI6c to %pI6c reset\n",
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&conn->c_laddr, &conn->c_faddr);
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rds_stats_inc(s_conn_reset);
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rds_send_path_reset(cp);
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cp->cp_flags = 0;
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/* Do not clear next_rx_seq here, else we cannot distinguish
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* retransmitted packets from new packets, and will hand all
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* of them to the application. That is not consistent with the
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* reliability guarantees of RDS. */
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}
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static void __rds_conn_path_init(struct rds_connection *conn,
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struct rds_conn_path *cp, bool is_outgoing)
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{
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spin_lock_init(&cp->cp_lock);
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cp->cp_next_tx_seq = 1;
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init_waitqueue_head(&cp->cp_waitq);
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INIT_LIST_HEAD(&cp->cp_send_queue);
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INIT_LIST_HEAD(&cp->cp_retrans);
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cp->cp_conn = conn;
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atomic_set(&cp->cp_state, RDS_CONN_DOWN);
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cp->cp_send_gen = 0;
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cp->cp_reconnect_jiffies = 0;
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cp->cp_conn->c_proposed_version = RDS_PROTOCOL_VERSION;
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INIT_DELAYED_WORK(&cp->cp_send_w, rds_send_worker);
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INIT_DELAYED_WORK(&cp->cp_recv_w, rds_recv_worker);
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INIT_DELAYED_WORK(&cp->cp_conn_w, rds_connect_worker);
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INIT_WORK(&cp->cp_down_w, rds_shutdown_worker);
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mutex_init(&cp->cp_cm_lock);
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cp->cp_flags = 0;
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}
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/*
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* There is only every one 'conn' for a given pair of addresses in the
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* system at a time. They contain messages to be retransmitted and so
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* span the lifetime of the actual underlying transport connections.
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*
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* For now they are not garbage collected once they're created. They
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* are torn down as the module is removed, if ever.
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*/
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static struct rds_connection *__rds_conn_create(struct net *net,
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const struct in6_addr *laddr,
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const struct in6_addr *faddr,
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struct rds_transport *trans,
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gfp_t gfp, u8 tos,
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int is_outgoing,
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int dev_if)
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{
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struct rds_connection *conn, *parent = NULL;
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struct hlist_head *head = rds_conn_bucket(laddr, faddr);
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struct rds_transport *loop_trans;
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unsigned long flags;
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int ret, i;
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int npaths = (trans->t_mp_capable ? RDS_MPATH_WORKERS : 1);
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rcu_read_lock();
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conn = rds_conn_lookup(net, head, laddr, faddr, trans, tos, dev_if);
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if (conn &&
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conn->c_loopback &&
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conn->c_trans != &rds_loop_transport &&
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ipv6_addr_equal(laddr, faddr) &&
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!is_outgoing) {
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/* This is a looped back IB connection, and we're
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* called by the code handling the incoming connect.
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* We need a second connection object into which we
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* can stick the other QP. */
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parent = conn;
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conn = parent->c_passive;
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}
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rcu_read_unlock();
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if (conn)
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goto out;
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conn = kmem_cache_zalloc(rds_conn_slab, gfp);
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if (!conn) {
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conn = ERR_PTR(-ENOMEM);
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goto out;
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}
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conn->c_path = kcalloc(npaths, sizeof(struct rds_conn_path), gfp);
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if (!conn->c_path) {
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kmem_cache_free(rds_conn_slab, conn);
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conn = ERR_PTR(-ENOMEM);
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goto out;
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}
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INIT_HLIST_NODE(&conn->c_hash_node);
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conn->c_laddr = *laddr;
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conn->c_isv6 = !ipv6_addr_v4mapped(laddr);
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conn->c_faddr = *faddr;
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conn->c_dev_if = dev_if;
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conn->c_tos = tos;
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#if IS_ENABLED(CONFIG_IPV6)
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/* If the local address is link local, set c_bound_if to be the
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* index used for this connection. Otherwise, set it to 0 as
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* the socket is not bound to an interface. c_bound_if is used
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* to look up a socket when a packet is received
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*/
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if (ipv6_addr_type(laddr) & IPV6_ADDR_LINKLOCAL)
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conn->c_bound_if = dev_if;
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else
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#endif
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conn->c_bound_if = 0;
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rds_conn_net_set(conn, net);
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ret = rds_cong_get_maps(conn);
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if (ret) {
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kfree(conn->c_path);
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kmem_cache_free(rds_conn_slab, conn);
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conn = ERR_PTR(ret);
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goto out;
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}
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/*
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* This is where a connection becomes loopback. If *any* RDS sockets
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* can bind to the destination address then we'd rather the messages
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* flow through loopback rather than either transport.
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*/
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loop_trans = rds_trans_get_preferred(net, faddr, conn->c_dev_if);
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if (loop_trans) {
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rds_trans_put(loop_trans);
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conn->c_loopback = 1;
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if (trans->t_prefer_loopback) {
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if (likely(is_outgoing)) {
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/* "outgoing" connection to local address.
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* Protocol says it wants the connection
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* handled by the loopback transport.
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* This is what TCP does.
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*/
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trans = &rds_loop_transport;
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} else {
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/* No transport currently in use
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* should end up here, but if it
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* does, reset/destroy the connection.
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*/
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kfree(conn->c_path);
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kmem_cache_free(rds_conn_slab, conn);
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conn = ERR_PTR(-EOPNOTSUPP);
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goto out;
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}
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}
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}
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conn->c_trans = trans;
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init_waitqueue_head(&conn->c_hs_waitq);
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for (i = 0; i < npaths; i++) {
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__rds_conn_path_init(conn, &conn->c_path[i],
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is_outgoing);
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conn->c_path[i].cp_index = i;
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}
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rcu_read_lock();
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if (rds_destroy_pending(conn))
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ret = -ENETDOWN;
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else
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ret = trans->conn_alloc(conn, GFP_ATOMIC);
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if (ret) {
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rcu_read_unlock();
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kfree(conn->c_path);
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kmem_cache_free(rds_conn_slab, conn);
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conn = ERR_PTR(ret);
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goto out;
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}
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rdsdebug("allocated conn %p for %pI6c -> %pI6c over %s %s\n",
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conn, laddr, faddr,
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strnlen(trans->t_name, sizeof(trans->t_name)) ?
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trans->t_name : "[unknown]", is_outgoing ? "(outgoing)" : "");
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/*
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* Since we ran without holding the conn lock, someone could
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* have created the same conn (either normal or passive) in the
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* interim. We check while holding the lock. If we won, we complete
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* init and return our conn. If we lost, we rollback and return the
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* other one.
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*/
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spin_lock_irqsave(&rds_conn_lock, flags);
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if (parent) {
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/* Creating passive conn */
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if (parent->c_passive) {
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trans->conn_free(conn->c_path[0].cp_transport_data);
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kfree(conn->c_path);
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kmem_cache_free(rds_conn_slab, conn);
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conn = parent->c_passive;
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} else {
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parent->c_passive = conn;
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rds_cong_add_conn(conn);
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rds_conn_count++;
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}
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} else {
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/* Creating normal conn */
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struct rds_connection *found;
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found = rds_conn_lookup(net, head, laddr, faddr, trans,
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tos, dev_if);
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if (found) {
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struct rds_conn_path *cp;
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int i;
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for (i = 0; i < npaths; i++) {
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cp = &conn->c_path[i];
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/* The ->conn_alloc invocation may have
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* allocated resource for all paths, so all
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* of them may have to be freed here.
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*/
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if (cp->cp_transport_data)
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trans->conn_free(cp->cp_transport_data);
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}
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kfree(conn->c_path);
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kmem_cache_free(rds_conn_slab, conn);
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conn = found;
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} else {
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conn->c_my_gen_num = rds_gen_num;
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conn->c_peer_gen_num = 0;
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hlist_add_head_rcu(&conn->c_hash_node, head);
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rds_cong_add_conn(conn);
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rds_conn_count++;
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}
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}
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spin_unlock_irqrestore(&rds_conn_lock, flags);
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rcu_read_unlock();
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out:
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return conn;
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}
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struct rds_connection *rds_conn_create(struct net *net,
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const struct in6_addr *laddr,
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const struct in6_addr *faddr,
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struct rds_transport *trans, u8 tos,
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gfp_t gfp, int dev_if)
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{
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return __rds_conn_create(net, laddr, faddr, trans, gfp, tos, 0, dev_if);
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}
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EXPORT_SYMBOL_GPL(rds_conn_create);
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struct rds_connection *rds_conn_create_outgoing(struct net *net,
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const struct in6_addr *laddr,
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const struct in6_addr *faddr,
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struct rds_transport *trans,
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u8 tos, gfp_t gfp, int dev_if)
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{
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return __rds_conn_create(net, laddr, faddr, trans, gfp, tos, 1, dev_if);
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}
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EXPORT_SYMBOL_GPL(rds_conn_create_outgoing);
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void rds_conn_shutdown(struct rds_conn_path *cp)
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{
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struct rds_connection *conn = cp->cp_conn;
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/* shut it down unless it's down already */
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if (!rds_conn_path_transition(cp, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
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/*
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* Quiesce the connection mgmt handlers before we start tearing
|
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* things down. We don't hold the mutex for the entire
|
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* duration of the shutdown operation, else we may be
|
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* deadlocking with the CM handler. Instead, the CM event
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* handler is supposed to check for state DISCONNECTING
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*/
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mutex_lock(&cp->cp_cm_lock);
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if (!rds_conn_path_transition(cp, RDS_CONN_UP,
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RDS_CONN_DISCONNECTING) &&
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!rds_conn_path_transition(cp, RDS_CONN_ERROR,
|
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RDS_CONN_DISCONNECTING)) {
|
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rds_conn_path_error(cp,
|
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"shutdown called in state %d\n",
|
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atomic_read(&cp->cp_state));
|
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mutex_unlock(&cp->cp_cm_lock);
|
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return;
|
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}
|
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mutex_unlock(&cp->cp_cm_lock);
|
|
|
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wait_event(cp->cp_waitq,
|
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!test_bit(RDS_IN_XMIT, &cp->cp_flags));
|
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wait_event(cp->cp_waitq,
|
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!test_bit(RDS_RECV_REFILL, &cp->cp_flags));
|
|
|
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conn->c_trans->conn_path_shutdown(cp);
|
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rds_conn_path_reset(cp);
|
|
|
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if (!rds_conn_path_transition(cp, RDS_CONN_DISCONNECTING,
|
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RDS_CONN_DOWN) &&
|
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!rds_conn_path_transition(cp, RDS_CONN_ERROR,
|
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RDS_CONN_DOWN)) {
|
|
/* This can happen - eg when we're in the middle of tearing
|
|
* down the connection, and someone unloads the rds module.
|
|
* Quite reproducible with loopback connections.
|
|
* Mostly harmless.
|
|
*
|
|
* Note that this also happens with rds-tcp because
|
|
* we could have triggered rds_conn_path_drop in irq
|
|
* mode from rds_tcp_state change on the receipt of
|
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* a FIN, thus we need to recheck for RDS_CONN_ERROR
|
|
* here.
|
|
*/
|
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rds_conn_path_error(cp, "%s: failed to transition "
|
|
"to state DOWN, current state "
|
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"is %d\n", __func__,
|
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atomic_read(&cp->cp_state));
|
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return;
|
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}
|
|
}
|
|
|
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/* Then reconnect if it's still live.
|
|
* The passive side of an IB loopback connection is never added
|
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* to the conn hash, so we never trigger a reconnect on this
|
|
* conn - the reconnect is always triggered by the active peer. */
|
|
cancel_delayed_work_sync(&cp->cp_conn_w);
|
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rcu_read_lock();
|
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if (!hlist_unhashed(&conn->c_hash_node)) {
|
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rcu_read_unlock();
|
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rds_queue_reconnect(cp);
|
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} else {
|
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rcu_read_unlock();
|
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}
|
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}
|
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|
|
/* destroy a single rds_conn_path. rds_conn_destroy() iterates over
|
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* all paths using rds_conn_path_destroy()
|
|
*/
|
|
static void rds_conn_path_destroy(struct rds_conn_path *cp)
|
|
{
|
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struct rds_message *rm, *rtmp;
|
|
|
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if (!cp->cp_transport_data)
|
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return;
|
|
|
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/* make sure lingering queued work won't try to ref the conn */
|
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cancel_delayed_work_sync(&cp->cp_send_w);
|
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cancel_delayed_work_sync(&cp->cp_recv_w);
|
|
|
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rds_conn_path_drop(cp, true);
|
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flush_work(&cp->cp_down_w);
|
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|
|
/* tear down queued messages */
|
|
list_for_each_entry_safe(rm, rtmp,
|
|
&cp->cp_send_queue,
|
|
m_conn_item) {
|
|
list_del_init(&rm->m_conn_item);
|
|
BUG_ON(!list_empty(&rm->m_sock_item));
|
|
rds_message_put(rm);
|
|
}
|
|
if (cp->cp_xmit_rm)
|
|
rds_message_put(cp->cp_xmit_rm);
|
|
|
|
WARN_ON(delayed_work_pending(&cp->cp_send_w));
|
|
WARN_ON(delayed_work_pending(&cp->cp_recv_w));
|
|
WARN_ON(delayed_work_pending(&cp->cp_conn_w));
|
|
WARN_ON(work_pending(&cp->cp_down_w));
|
|
|
|
cp->cp_conn->c_trans->conn_free(cp->cp_transport_data);
|
|
}
|
|
|
|
/*
|
|
* Stop and free a connection.
|
|
*
|
|
* This can only be used in very limited circumstances. It assumes that once
|
|
* the conn has been shutdown that no one else is referencing the connection.
|
|
* We can only ensure this in the rmmod path in the current code.
|
|
*/
|
|
void rds_conn_destroy(struct rds_connection *conn)
|
|
{
|
|
unsigned long flags;
|
|
int i;
|
|
struct rds_conn_path *cp;
|
|
int npaths = (conn->c_trans->t_mp_capable ? RDS_MPATH_WORKERS : 1);
|
|
|
|
rdsdebug("freeing conn %p for %pI4 -> "
|
|
"%pI4\n", conn, &conn->c_laddr,
|
|
&conn->c_faddr);
|
|
|
|
/* Ensure conn will not be scheduled for reconnect */
|
|
spin_lock_irq(&rds_conn_lock);
|
|
hlist_del_init_rcu(&conn->c_hash_node);
|
|
spin_unlock_irq(&rds_conn_lock);
|
|
synchronize_rcu();
|
|
|
|
/* shut the connection down */
|
|
for (i = 0; i < npaths; i++) {
|
|
cp = &conn->c_path[i];
|
|
rds_conn_path_destroy(cp);
|
|
BUG_ON(!list_empty(&cp->cp_retrans));
|
|
}
|
|
|
|
/*
|
|
* The congestion maps aren't freed up here. They're
|
|
* freed by rds_cong_exit() after all the connections
|
|
* have been freed.
|
|
*/
|
|
rds_cong_remove_conn(conn);
|
|
|
|
kfree(conn->c_path);
|
|
kmem_cache_free(rds_conn_slab, conn);
|
|
|
|
spin_lock_irqsave(&rds_conn_lock, flags);
|
|
rds_conn_count--;
|
|
spin_unlock_irqrestore(&rds_conn_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_conn_destroy);
|
|
|
|
static void __rds_inc_msg_cp(struct rds_incoming *inc,
|
|
struct rds_info_iterator *iter,
|
|
void *saddr, void *daddr, int flip, bool isv6)
|
|
{
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (isv6)
|
|
rds6_inc_info_copy(inc, iter, saddr, daddr, flip);
|
|
else
|
|
#endif
|
|
rds_inc_info_copy(inc, iter, *(__be32 *)saddr,
|
|
*(__be32 *)daddr, flip);
|
|
}
|
|
|
|
static void rds_conn_message_info_cmn(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens,
|
|
int want_send, bool isv6)
|
|
{
|
|
struct hlist_head *head;
|
|
struct list_head *list;
|
|
struct rds_connection *conn;
|
|
struct rds_message *rm;
|
|
unsigned int total = 0;
|
|
unsigned long flags;
|
|
size_t i;
|
|
int j;
|
|
|
|
if (isv6)
|
|
len /= sizeof(struct rds6_info_message);
|
|
else
|
|
len /= sizeof(struct rds_info_message);
|
|
|
|
rcu_read_lock();
|
|
|
|
for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
|
|
i++, head++) {
|
|
hlist_for_each_entry_rcu(conn, head, c_hash_node) {
|
|
struct rds_conn_path *cp;
|
|
int npaths;
|
|
|
|
if (!isv6 && conn->c_isv6)
|
|
continue;
|
|
|
|
npaths = (conn->c_trans->t_mp_capable ?
|
|
RDS_MPATH_WORKERS : 1);
|
|
|
|
for (j = 0; j < npaths; j++) {
|
|
cp = &conn->c_path[j];
|
|
if (want_send)
|
|
list = &cp->cp_send_queue;
|
|
else
|
|
list = &cp->cp_retrans;
|
|
|
|
spin_lock_irqsave(&cp->cp_lock, flags);
|
|
|
|
/* XXX too lazy to maintain counts.. */
|
|
list_for_each_entry(rm, list, m_conn_item) {
|
|
total++;
|
|
if (total <= len)
|
|
__rds_inc_msg_cp(&rm->m_inc,
|
|
iter,
|
|
&conn->c_laddr,
|
|
&conn->c_faddr,
|
|
0, isv6);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&cp->cp_lock, flags);
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
lens->nr = total;
|
|
if (isv6)
|
|
lens->each = sizeof(struct rds6_info_message);
|
|
else
|
|
lens->each = sizeof(struct rds_info_message);
|
|
}
|
|
|
|
static void rds_conn_message_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens,
|
|
int want_send)
|
|
{
|
|
rds_conn_message_info_cmn(sock, len, iter, lens, want_send, false);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void rds6_conn_message_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens,
|
|
int want_send)
|
|
{
|
|
rds_conn_message_info_cmn(sock, len, iter, lens, want_send, true);
|
|
}
|
|
#endif
|
|
|
|
static void rds_conn_message_info_send(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
rds_conn_message_info(sock, len, iter, lens, 1);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void rds6_conn_message_info_send(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
rds6_conn_message_info(sock, len, iter, lens, 1);
|
|
}
|
|
#endif
|
|
|
|
static void rds_conn_message_info_retrans(struct socket *sock,
|
|
unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
rds_conn_message_info(sock, len, iter, lens, 0);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void rds6_conn_message_info_retrans(struct socket *sock,
|
|
unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
rds6_conn_message_info(sock, len, iter, lens, 0);
|
|
}
|
|
#endif
|
|
|
|
void rds_for_each_conn_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens,
|
|
int (*visitor)(struct rds_connection *, void *),
|
|
u64 *buffer,
|
|
size_t item_len)
|
|
{
|
|
struct hlist_head *head;
|
|
struct rds_connection *conn;
|
|
size_t i;
|
|
|
|
rcu_read_lock();
|
|
|
|
lens->nr = 0;
|
|
lens->each = item_len;
|
|
|
|
for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
|
|
i++, head++) {
|
|
hlist_for_each_entry_rcu(conn, head, c_hash_node) {
|
|
|
|
/* XXX no c_lock usage.. */
|
|
if (!visitor(conn, buffer))
|
|
continue;
|
|
|
|
/* We copy as much as we can fit in the buffer,
|
|
* but we count all items so that the caller
|
|
* can resize the buffer. */
|
|
if (len >= item_len) {
|
|
rds_info_copy(iter, buffer, item_len);
|
|
len -= item_len;
|
|
}
|
|
lens->nr++;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_for_each_conn_info);
|
|
|
|
static void rds_walk_conn_path_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens,
|
|
int (*visitor)(struct rds_conn_path *, void *),
|
|
u64 *buffer,
|
|
size_t item_len)
|
|
{
|
|
struct hlist_head *head;
|
|
struct rds_connection *conn;
|
|
size_t i;
|
|
|
|
rcu_read_lock();
|
|
|
|
lens->nr = 0;
|
|
lens->each = item_len;
|
|
|
|
for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
|
|
i++, head++) {
|
|
hlist_for_each_entry_rcu(conn, head, c_hash_node) {
|
|
struct rds_conn_path *cp;
|
|
|
|
/* XXX We only copy the information from the first
|
|
* path for now. The problem is that if there are
|
|
* more than one underlying paths, we cannot report
|
|
* information of all of them using the existing
|
|
* API. For example, there is only one next_tx_seq,
|
|
* which path's next_tx_seq should we report? It is
|
|
* a bug in the design of MPRDS.
|
|
*/
|
|
cp = conn->c_path;
|
|
|
|
/* XXX no cp_lock usage.. */
|
|
if (!visitor(cp, buffer))
|
|
continue;
|
|
|
|
/* We copy as much as we can fit in the buffer,
|
|
* but we count all items so that the caller
|
|
* can resize the buffer.
|
|
*/
|
|
if (len >= item_len) {
|
|
rds_info_copy(iter, buffer, item_len);
|
|
len -= item_len;
|
|
}
|
|
lens->nr++;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int rds_conn_info_visitor(struct rds_conn_path *cp, void *buffer)
|
|
{
|
|
struct rds_info_connection *cinfo = buffer;
|
|
struct rds_connection *conn = cp->cp_conn;
|
|
|
|
if (conn->c_isv6)
|
|
return 0;
|
|
|
|
cinfo->next_tx_seq = cp->cp_next_tx_seq;
|
|
cinfo->next_rx_seq = cp->cp_next_rx_seq;
|
|
cinfo->laddr = conn->c_laddr.s6_addr32[3];
|
|
cinfo->faddr = conn->c_faddr.s6_addr32[3];
|
|
cinfo->tos = conn->c_tos;
|
|
strncpy(cinfo->transport, conn->c_trans->t_name,
|
|
sizeof(cinfo->transport));
|
|
cinfo->flags = 0;
|
|
|
|
rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &cp->cp_flags),
|
|
SENDING);
|
|
/* XXX Future: return the state rather than these funky bits */
|
|
rds_conn_info_set(cinfo->flags,
|
|
atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING,
|
|
CONNECTING);
|
|
rds_conn_info_set(cinfo->flags,
|
|
atomic_read(&cp->cp_state) == RDS_CONN_UP,
|
|
CONNECTED);
|
|
return 1;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int rds6_conn_info_visitor(struct rds_conn_path *cp, void *buffer)
|
|
{
|
|
struct rds6_info_connection *cinfo6 = buffer;
|
|
struct rds_connection *conn = cp->cp_conn;
|
|
|
|
cinfo6->next_tx_seq = cp->cp_next_tx_seq;
|
|
cinfo6->next_rx_seq = cp->cp_next_rx_seq;
|
|
cinfo6->laddr = conn->c_laddr;
|
|
cinfo6->faddr = conn->c_faddr;
|
|
strncpy(cinfo6->transport, conn->c_trans->t_name,
|
|
sizeof(cinfo6->transport));
|
|
cinfo6->flags = 0;
|
|
|
|
rds_conn_info_set(cinfo6->flags, test_bit(RDS_IN_XMIT, &cp->cp_flags),
|
|
SENDING);
|
|
/* XXX Future: return the state rather than these funky bits */
|
|
rds_conn_info_set(cinfo6->flags,
|
|
atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING,
|
|
CONNECTING);
|
|
rds_conn_info_set(cinfo6->flags,
|
|
atomic_read(&cp->cp_state) == RDS_CONN_UP,
|
|
CONNECTED);
|
|
/* Just return 1 as there is no error case. This is a helper function
|
|
* for rds_walk_conn_path_info() and it wants a return value.
|
|
*/
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static void rds_conn_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
u64 buffer[(sizeof(struct rds_info_connection) + 7) / 8];
|
|
|
|
rds_walk_conn_path_info(sock, len, iter, lens,
|
|
rds_conn_info_visitor,
|
|
buffer,
|
|
sizeof(struct rds_info_connection));
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void rds6_conn_info(struct socket *sock, unsigned int len,
|
|
struct rds_info_iterator *iter,
|
|
struct rds_info_lengths *lens)
|
|
{
|
|
u64 buffer[(sizeof(struct rds6_info_connection) + 7) / 8];
|
|
|
|
rds_walk_conn_path_info(sock, len, iter, lens,
|
|
rds6_conn_info_visitor,
|
|
buffer,
|
|
sizeof(struct rds6_info_connection));
|
|
}
|
|
#endif
|
|
|
|
int rds_conn_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = rds_loop_net_init(); /* register pernet callback */
|
|
if (ret)
|
|
return ret;
|
|
|
|
rds_conn_slab = kmem_cache_create("rds_connection",
|
|
sizeof(struct rds_connection),
|
|
0, 0, NULL);
|
|
if (!rds_conn_slab) {
|
|
rds_loop_net_exit();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rds_info_register_func(RDS_INFO_CONNECTIONS, rds_conn_info);
|
|
rds_info_register_func(RDS_INFO_SEND_MESSAGES,
|
|
rds_conn_message_info_send);
|
|
rds_info_register_func(RDS_INFO_RETRANS_MESSAGES,
|
|
rds_conn_message_info_retrans);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
rds_info_register_func(RDS6_INFO_CONNECTIONS, rds6_conn_info);
|
|
rds_info_register_func(RDS6_INFO_SEND_MESSAGES,
|
|
rds6_conn_message_info_send);
|
|
rds_info_register_func(RDS6_INFO_RETRANS_MESSAGES,
|
|
rds6_conn_message_info_retrans);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
void rds_conn_exit(void)
|
|
{
|
|
rds_loop_net_exit(); /* unregister pernet callback */
|
|
rds_loop_exit();
|
|
|
|
WARN_ON(!hlist_empty(rds_conn_hash));
|
|
|
|
kmem_cache_destroy(rds_conn_slab);
|
|
|
|
rds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info);
|
|
rds_info_deregister_func(RDS_INFO_SEND_MESSAGES,
|
|
rds_conn_message_info_send);
|
|
rds_info_deregister_func(RDS_INFO_RETRANS_MESSAGES,
|
|
rds_conn_message_info_retrans);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
rds_info_deregister_func(RDS6_INFO_CONNECTIONS, rds6_conn_info);
|
|
rds_info_deregister_func(RDS6_INFO_SEND_MESSAGES,
|
|
rds6_conn_message_info_send);
|
|
rds_info_deregister_func(RDS6_INFO_RETRANS_MESSAGES,
|
|
rds6_conn_message_info_retrans);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Force a disconnect
|
|
*/
|
|
void rds_conn_path_drop(struct rds_conn_path *cp, bool destroy)
|
|
{
|
|
atomic_set(&cp->cp_state, RDS_CONN_ERROR);
|
|
|
|
rcu_read_lock();
|
|
if (!destroy && rds_destroy_pending(cp->cp_conn)) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
queue_work(rds_wq, &cp->cp_down_w);
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_conn_path_drop);
|
|
|
|
void rds_conn_drop(struct rds_connection *conn)
|
|
{
|
|
WARN_ON(conn->c_trans->t_mp_capable);
|
|
rds_conn_path_drop(&conn->c_path[0], false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_conn_drop);
|
|
|
|
/*
|
|
* If the connection is down, trigger a connect. We may have scheduled a
|
|
* delayed reconnect however - in this case we should not interfere.
|
|
*/
|
|
void rds_conn_path_connect_if_down(struct rds_conn_path *cp)
|
|
{
|
|
rcu_read_lock();
|
|
if (rds_destroy_pending(cp->cp_conn)) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
if (rds_conn_path_state(cp) == RDS_CONN_DOWN &&
|
|
!test_and_set_bit(RDS_RECONNECT_PENDING, &cp->cp_flags))
|
|
queue_delayed_work(rds_wq, &cp->cp_conn_w, 0);
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_conn_path_connect_if_down);
|
|
|
|
/* Check connectivity of all paths
|
|
*/
|
|
void rds_check_all_paths(struct rds_connection *conn)
|
|
{
|
|
int i = 0;
|
|
|
|
do {
|
|
rds_conn_path_connect_if_down(&conn->c_path[i]);
|
|
} while (++i < conn->c_npaths);
|
|
}
|
|
|
|
void rds_conn_connect_if_down(struct rds_connection *conn)
|
|
{
|
|
WARN_ON(conn->c_trans->t_mp_capable);
|
|
rds_conn_path_connect_if_down(&conn->c_path[0]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_conn_connect_if_down);
|
|
|
|
void
|
|
__rds_conn_path_error(struct rds_conn_path *cp, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
vprintk(fmt, ap);
|
|
va_end(ap);
|
|
|
|
rds_conn_path_drop(cp, false);
|
|
}
|