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![Yajun Deng](/assets/img/avatar_default.png)
The 'if (dev)' statement already move into dev_{put , hold}, so remove redundant if statements. Signed-off-by: Yajun Deng <yajun.deng@linux.dev> Signed-off-by: David S. Miller <davem@davemloft.net>
852 lines
23 KiB
C
852 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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* IB infrastructure:
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* Establish SMC-R as an Infiniband Client to be notified about added and
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* removed IB devices of type RDMA.
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* Determine device and port characteristics for these IB devices.
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/random.h>
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#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_cache.h>
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#include "smc_pnet.h"
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#include "smc_ib.h"
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#include "smc_core.h"
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#include "smc_wr.h"
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#include "smc.h"
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#include "smc_netlink.h"
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#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
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#define SMC_QP_MIN_RNR_TIMER 5
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#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
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#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
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#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
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struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
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.mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex),
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.list = LIST_HEAD_INIT(smc_ib_devices.list),
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};
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u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
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static int smc_ib_modify_qp_init(struct smc_link *lnk)
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{
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struct ib_qp_attr qp_attr;
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memset(&qp_attr, 0, sizeof(qp_attr));
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qp_attr.qp_state = IB_QPS_INIT;
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qp_attr.pkey_index = 0;
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qp_attr.port_num = lnk->ibport;
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qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
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| IB_ACCESS_REMOTE_WRITE;
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return ib_modify_qp(lnk->roce_qp, &qp_attr,
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IB_QP_STATE | IB_QP_PKEY_INDEX |
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IB_QP_ACCESS_FLAGS | IB_QP_PORT);
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}
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static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
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{
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enum ib_qp_attr_mask qp_attr_mask =
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IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
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IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
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struct ib_qp_attr qp_attr;
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memset(&qp_attr, 0, sizeof(qp_attr));
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qp_attr.qp_state = IB_QPS_RTR;
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qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
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qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
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rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
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rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0);
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rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
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memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
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sizeof(lnk->peer_mac));
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qp_attr.dest_qp_num = lnk->peer_qpn;
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qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
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qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
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* requests
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*/
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qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
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return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
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}
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int smc_ib_modify_qp_rts(struct smc_link *lnk)
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{
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struct ib_qp_attr qp_attr;
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memset(&qp_attr, 0, sizeof(qp_attr));
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qp_attr.qp_state = IB_QPS_RTS;
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qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
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qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
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qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
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qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
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qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
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* atomic ops allowed
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*/
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return ib_modify_qp(lnk->roce_qp, &qp_attr,
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IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
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IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
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IB_QP_MAX_QP_RD_ATOMIC);
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}
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int smc_ib_modify_qp_reset(struct smc_link *lnk)
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{
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struct ib_qp_attr qp_attr;
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memset(&qp_attr, 0, sizeof(qp_attr));
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qp_attr.qp_state = IB_QPS_RESET;
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return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
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}
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int smc_ib_ready_link(struct smc_link *lnk)
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{
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struct smc_link_group *lgr = smc_get_lgr(lnk);
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int rc = 0;
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rc = smc_ib_modify_qp_init(lnk);
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if (rc)
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goto out;
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rc = smc_ib_modify_qp_rtr(lnk);
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if (rc)
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goto out;
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smc_wr_remember_qp_attr(lnk);
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rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
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IB_CQ_SOLICITED_MASK);
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if (rc)
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goto out;
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rc = smc_wr_rx_post_init(lnk);
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if (rc)
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goto out;
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smc_wr_remember_qp_attr(lnk);
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if (lgr->role == SMC_SERV) {
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rc = smc_ib_modify_qp_rts(lnk);
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if (rc)
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goto out;
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smc_wr_remember_qp_attr(lnk);
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}
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out:
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return rc;
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}
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static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
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{
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const struct ib_gid_attr *attr;
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int rc;
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attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
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if (IS_ERR(attr))
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return -ENODEV;
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rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
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rdma_put_gid_attr(attr);
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return rc;
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}
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/* Create an identifier unique for this instance of SMC-R.
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* The MAC-address of the first active registered IB device
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* plus a random 2-byte number is used to create this identifier.
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* This name is delivered to the peer during connection initialization.
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*/
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static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
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u8 ibport)
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{
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memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
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sizeof(smcibdev->mac[ibport - 1]));
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}
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bool smc_ib_is_valid_local_systemid(void)
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{
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return !is_zero_ether_addr(&local_systemid[2]);
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}
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static void smc_ib_init_local_systemid(void)
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{
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get_random_bytes(&local_systemid[0], 2);
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}
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bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
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{
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return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
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}
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/* determine the gid for an ib-device port and vlan id */
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int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
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unsigned short vlan_id, u8 gid[], u8 *sgid_index)
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{
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const struct ib_gid_attr *attr;
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const struct net_device *ndev;
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int i;
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for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
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attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
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if (IS_ERR(attr))
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continue;
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rcu_read_lock();
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ndev = rdma_read_gid_attr_ndev_rcu(attr);
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if (!IS_ERR(ndev) &&
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((!vlan_id && !is_vlan_dev(ndev)) ||
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(vlan_id && is_vlan_dev(ndev) &&
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vlan_dev_vlan_id(ndev) == vlan_id)) &&
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attr->gid_type == IB_GID_TYPE_ROCE) {
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rcu_read_unlock();
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if (gid)
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memcpy(gid, &attr->gid, SMC_GID_SIZE);
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if (sgid_index)
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*sgid_index = attr->index;
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rdma_put_gid_attr(attr);
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return 0;
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}
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rcu_read_unlock();
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rdma_put_gid_attr(attr);
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}
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return -ENODEV;
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}
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static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
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{
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int rc;
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memset(&smcibdev->pattr[ibport - 1], 0,
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sizeof(smcibdev->pattr[ibport - 1]));
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rc = ib_query_port(smcibdev->ibdev, ibport,
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&smcibdev->pattr[ibport - 1]);
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if (rc)
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goto out;
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/* the SMC protocol requires specification of the RoCE MAC address */
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rc = smc_ib_fill_mac(smcibdev, ibport);
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if (rc)
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goto out;
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if (!smc_ib_is_valid_local_systemid() &&
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smc_ib_port_active(smcibdev, ibport))
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/* create unique system identifier */
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smc_ib_define_local_systemid(smcibdev, ibport);
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out:
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return rc;
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}
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/* process context wrapper for might_sleep smc_ib_remember_port_attr */
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static void smc_ib_port_event_work(struct work_struct *work)
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{
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struct smc_ib_device *smcibdev = container_of(
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work, struct smc_ib_device, port_event_work);
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u8 port_idx;
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for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
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smc_ib_remember_port_attr(smcibdev, port_idx + 1);
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clear_bit(port_idx, &smcibdev->port_event_mask);
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if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
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set_bit(port_idx, smcibdev->ports_going_away);
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smcr_port_err(smcibdev, port_idx + 1);
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} else {
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clear_bit(port_idx, smcibdev->ports_going_away);
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smcr_port_add(smcibdev, port_idx + 1);
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}
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}
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}
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/* can be called in IRQ context */
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static void smc_ib_global_event_handler(struct ib_event_handler *handler,
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struct ib_event *ibevent)
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{
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struct smc_ib_device *smcibdev;
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bool schedule = false;
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u8 port_idx;
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smcibdev = container_of(handler, struct smc_ib_device, event_handler);
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switch (ibevent->event) {
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case IB_EVENT_DEVICE_FATAL:
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/* terminate all ports on device */
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for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
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set_bit(port_idx, &smcibdev->port_event_mask);
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if (!test_and_set_bit(port_idx,
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smcibdev->ports_going_away))
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schedule = true;
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}
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if (schedule)
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schedule_work(&smcibdev->port_event_work);
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break;
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case IB_EVENT_PORT_ACTIVE:
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port_idx = ibevent->element.port_num - 1;
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if (port_idx >= SMC_MAX_PORTS)
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break;
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set_bit(port_idx, &smcibdev->port_event_mask);
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if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
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schedule_work(&smcibdev->port_event_work);
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break;
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case IB_EVENT_PORT_ERR:
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port_idx = ibevent->element.port_num - 1;
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if (port_idx >= SMC_MAX_PORTS)
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break;
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set_bit(port_idx, &smcibdev->port_event_mask);
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if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
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schedule_work(&smcibdev->port_event_work);
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break;
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case IB_EVENT_GID_CHANGE:
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port_idx = ibevent->element.port_num - 1;
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if (port_idx >= SMC_MAX_PORTS)
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break;
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set_bit(port_idx, &smcibdev->port_event_mask);
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schedule_work(&smcibdev->port_event_work);
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break;
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default:
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break;
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}
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}
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void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
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{
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if (lnk->roce_pd)
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ib_dealloc_pd(lnk->roce_pd);
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lnk->roce_pd = NULL;
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}
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int smc_ib_create_protection_domain(struct smc_link *lnk)
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{
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int rc;
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lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
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rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
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if (IS_ERR(lnk->roce_pd))
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lnk->roce_pd = NULL;
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return rc;
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}
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static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
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struct smc_ib_device *smcibdev)
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{
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struct smc_link_group *lgr;
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bool rc = false;
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int i;
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spin_lock_bh(&smc_lgr->lock);
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list_for_each_entry(lgr, &smc_lgr->list, list) {
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if (lgr->is_smcd)
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continue;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
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if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
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lgr->lnk[i].smcibdev != smcibdev)
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continue;
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if (lgr->type == SMC_LGR_SINGLE ||
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lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
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rc = true;
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goto out;
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}
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}
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}
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out:
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spin_unlock_bh(&smc_lgr->lock);
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return rc;
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}
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static int smc_nl_handle_dev_port(struct sk_buff *skb,
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struct ib_device *ibdev,
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struct smc_ib_device *smcibdev,
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int port)
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{
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char smc_pnet[SMC_MAX_PNETID_LEN + 1];
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struct nlattr *port_attrs;
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unsigned char port_state;
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int lnk_count = 0;
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port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
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if (!port_attrs)
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goto errout;
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if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
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smcibdev->pnetid_by_user[port]))
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goto errattr;
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memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
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smc_pnet[SMC_MAX_PNETID_LEN] = 0;
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if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
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goto errattr;
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if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
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smcibdev->ndev_ifidx[port]))
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
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goto errattr;
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port_state = smc_ib_port_active(smcibdev, port + 1);
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if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
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goto errattr;
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lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
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if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
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goto errattr;
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nla_nest_end(skb, port_attrs);
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return 0;
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errattr:
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nla_nest_cancel(skb, port_attrs);
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errout:
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return -EMSGSIZE;
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}
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static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
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struct sk_buff *skb)
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{
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if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
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return false;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
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return false;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
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return false;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
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return false;
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if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
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return false;
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return true;
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}
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static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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char smc_ibname[IB_DEVICE_NAME_MAX];
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struct smc_pci_dev smc_pci_dev;
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struct pci_dev *pci_dev;
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unsigned char is_crit;
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struct nlattr *attrs;
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void *nlh;
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int i;
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nlh = 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_GET_DEV_SMCR);
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if (!nlh)
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goto errmsg;
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attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
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if (!attrs)
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goto errout;
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is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
|
|
if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
|
|
goto errattr;
|
|
if (smcibdev->ibdev->dev.parent) {
|
|
memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
|
|
pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
|
|
smc_set_pci_values(pci_dev, &smc_pci_dev);
|
|
if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
|
|
goto errattr;
|
|
}
|
|
snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
|
|
if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
|
|
goto errattr;
|
|
for (i = 1; i <= SMC_MAX_PORTS; i++) {
|
|
if (!rdma_is_port_valid(smcibdev->ibdev, i))
|
|
continue;
|
|
if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
|
|
smcibdev, i - 1))
|
|
goto errattr;
|
|
}
|
|
|
|
nla_nest_end(skb, attrs);
|
|
genlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
errattr:
|
|
nla_nest_cancel(skb, attrs);
|
|
errout:
|
|
genlmsg_cancel(skb, nlh);
|
|
errmsg:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
|
|
struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
|
|
struct smc_ib_device *smcibdev;
|
|
int snum = cb_ctx->pos[0];
|
|
int num = 0;
|
|
|
|
mutex_lock(&dev_list->mutex);
|
|
list_for_each_entry(smcibdev, &dev_list->list, list) {
|
|
if (num < snum)
|
|
goto next;
|
|
if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
|
|
goto errout;
|
|
next:
|
|
num++;
|
|
}
|
|
errout:
|
|
mutex_unlock(&dev_list->mutex);
|
|
cb_ctx->pos[0] = num;
|
|
}
|
|
|
|
int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
|
|
return skb->len;
|
|
}
|
|
|
|
static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
|
|
{
|
|
struct smc_link *lnk = (struct smc_link *)priv;
|
|
struct smc_ib_device *smcibdev = lnk->smcibdev;
|
|
u8 port_idx;
|
|
|
|
switch (ibevent->event) {
|
|
case IB_EVENT_QP_FATAL:
|
|
case IB_EVENT_QP_ACCESS_ERR:
|
|
port_idx = ibevent->element.qp->port - 1;
|
|
if (port_idx >= SMC_MAX_PORTS)
|
|
break;
|
|
set_bit(port_idx, &smcibdev->port_event_mask);
|
|
if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
|
|
schedule_work(&smcibdev->port_event_work);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void smc_ib_destroy_queue_pair(struct smc_link *lnk)
|
|
{
|
|
if (lnk->roce_qp)
|
|
ib_destroy_qp(lnk->roce_qp);
|
|
lnk->roce_qp = NULL;
|
|
}
|
|
|
|
/* create a queue pair within the protection domain for a link */
|
|
int smc_ib_create_queue_pair(struct smc_link *lnk)
|
|
{
|
|
struct ib_qp_init_attr qp_attr = {
|
|
.event_handler = smc_ib_qp_event_handler,
|
|
.qp_context = lnk,
|
|
.send_cq = lnk->smcibdev->roce_cq_send,
|
|
.recv_cq = lnk->smcibdev->roce_cq_recv,
|
|
.srq = NULL,
|
|
.cap = {
|
|
/* include unsolicited rdma_writes as well,
|
|
* there are max. 2 RDMA_WRITE per 1 WR_SEND
|
|
*/
|
|
.max_send_wr = SMC_WR_BUF_CNT * 3,
|
|
.max_recv_wr = SMC_WR_BUF_CNT * 3,
|
|
.max_send_sge = SMC_IB_MAX_SEND_SGE,
|
|
.max_recv_sge = 1,
|
|
},
|
|
.sq_sig_type = IB_SIGNAL_REQ_WR,
|
|
.qp_type = IB_QPT_RC,
|
|
};
|
|
int rc;
|
|
|
|
lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
|
|
rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
|
|
if (IS_ERR(lnk->roce_qp))
|
|
lnk->roce_qp = NULL;
|
|
else
|
|
smc_wr_remember_qp_attr(lnk);
|
|
return rc;
|
|
}
|
|
|
|
void smc_ib_put_memory_region(struct ib_mr *mr)
|
|
{
|
|
ib_dereg_mr(mr);
|
|
}
|
|
|
|
static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
|
|
{
|
|
unsigned int offset = 0;
|
|
int sg_num;
|
|
|
|
/* map the largest prefix of a dma mapped SG list */
|
|
sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx],
|
|
buf_slot->sgt[link_idx].sgl,
|
|
buf_slot->sgt[link_idx].orig_nents,
|
|
&offset, PAGE_SIZE);
|
|
|
|
return sg_num;
|
|
}
|
|
|
|
/* Allocate a memory region and map the dma mapped SG list of buf_slot */
|
|
int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
|
|
struct smc_buf_desc *buf_slot, u8 link_idx)
|
|
{
|
|
if (buf_slot->mr_rx[link_idx])
|
|
return 0; /* already done */
|
|
|
|
buf_slot->mr_rx[link_idx] =
|
|
ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
|
|
if (IS_ERR(buf_slot->mr_rx[link_idx])) {
|
|
int rc;
|
|
|
|
rc = PTR_ERR(buf_slot->mr_rx[link_idx]);
|
|
buf_slot->mr_rx[link_idx] = NULL;
|
|
return rc;
|
|
}
|
|
|
|
if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* synchronize buffer usage for cpu access */
|
|
void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
|
|
struct smc_buf_desc *buf_slot,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct scatterlist *sg;
|
|
unsigned int i;
|
|
|
|
/* for now there is just one DMA address */
|
|
for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
|
|
buf_slot->sgt[lnk->link_idx].nents, i) {
|
|
if (!sg_dma_len(sg))
|
|
break;
|
|
ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
|
|
sg_dma_address(sg),
|
|
sg_dma_len(sg),
|
|
data_direction);
|
|
}
|
|
}
|
|
|
|
/* synchronize buffer usage for device access */
|
|
void smc_ib_sync_sg_for_device(struct smc_link *lnk,
|
|
struct smc_buf_desc *buf_slot,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct scatterlist *sg;
|
|
unsigned int i;
|
|
|
|
/* for now there is just one DMA address */
|
|
for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
|
|
buf_slot->sgt[lnk->link_idx].nents, i) {
|
|
if (!sg_dma_len(sg))
|
|
break;
|
|
ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
|
|
sg_dma_address(sg),
|
|
sg_dma_len(sg),
|
|
data_direction);
|
|
}
|
|
}
|
|
|
|
/* Map a new TX or RX buffer SG-table to DMA */
|
|
int smc_ib_buf_map_sg(struct smc_link *lnk,
|
|
struct smc_buf_desc *buf_slot,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
int mapped_nents;
|
|
|
|
mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
|
|
buf_slot->sgt[lnk->link_idx].sgl,
|
|
buf_slot->sgt[lnk->link_idx].orig_nents,
|
|
data_direction);
|
|
if (!mapped_nents)
|
|
return -ENOMEM;
|
|
|
|
return mapped_nents;
|
|
}
|
|
|
|
void smc_ib_buf_unmap_sg(struct smc_link *lnk,
|
|
struct smc_buf_desc *buf_slot,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
|
|
return; /* already unmapped */
|
|
|
|
ib_dma_unmap_sg(lnk->smcibdev->ibdev,
|
|
buf_slot->sgt[lnk->link_idx].sgl,
|
|
buf_slot->sgt[lnk->link_idx].orig_nents,
|
|
data_direction);
|
|
buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
|
|
}
|
|
|
|
long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
|
|
{
|
|
struct ib_cq_init_attr cqattr = {
|
|
.cqe = SMC_MAX_CQE, .comp_vector = 0 };
|
|
int cqe_size_order, smc_order;
|
|
long rc;
|
|
|
|
mutex_lock(&smcibdev->mutex);
|
|
rc = 0;
|
|
if (smcibdev->initialized)
|
|
goto out;
|
|
/* the calculated number of cq entries fits to mlx5 cq allocation */
|
|
cqe_size_order = cache_line_size() == 128 ? 7 : 6;
|
|
smc_order = MAX_ORDER - cqe_size_order - 1;
|
|
if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
|
|
cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
|
|
smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
|
|
smc_wr_tx_cq_handler, NULL,
|
|
smcibdev, &cqattr);
|
|
rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
|
|
if (IS_ERR(smcibdev->roce_cq_send)) {
|
|
smcibdev->roce_cq_send = NULL;
|
|
goto out;
|
|
}
|
|
smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
|
|
smc_wr_rx_cq_handler, NULL,
|
|
smcibdev, &cqattr);
|
|
rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
|
|
if (IS_ERR(smcibdev->roce_cq_recv)) {
|
|
smcibdev->roce_cq_recv = NULL;
|
|
goto err;
|
|
}
|
|
smc_wr_add_dev(smcibdev);
|
|
smcibdev->initialized = 1;
|
|
goto out;
|
|
|
|
err:
|
|
ib_destroy_cq(smcibdev->roce_cq_send);
|
|
out:
|
|
mutex_unlock(&smcibdev->mutex);
|
|
return rc;
|
|
}
|
|
|
|
static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
|
|
{
|
|
mutex_lock(&smcibdev->mutex);
|
|
if (!smcibdev->initialized)
|
|
goto out;
|
|
smcibdev->initialized = 0;
|
|
ib_destroy_cq(smcibdev->roce_cq_recv);
|
|
ib_destroy_cq(smcibdev->roce_cq_send);
|
|
smc_wr_remove_dev(smcibdev);
|
|
out:
|
|
mutex_unlock(&smcibdev->mutex);
|
|
}
|
|
|
|
static struct ib_client smc_ib_client;
|
|
|
|
static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
|
|
{
|
|
struct ib_device *ibdev = smcibdev->ibdev;
|
|
struct net_device *ndev;
|
|
|
|
if (!ibdev->ops.get_netdev)
|
|
return;
|
|
ndev = ibdev->ops.get_netdev(ibdev, port + 1);
|
|
if (ndev) {
|
|
smcibdev->ndev_ifidx[port] = ndev->ifindex;
|
|
dev_put(ndev);
|
|
}
|
|
}
|
|
|
|
void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
|
|
{
|
|
struct smc_ib_device *smcibdev;
|
|
struct ib_device *libdev;
|
|
struct net_device *lndev;
|
|
u8 port_cnt;
|
|
int i;
|
|
|
|
mutex_lock(&smc_ib_devices.mutex);
|
|
list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
|
|
port_cnt = smcibdev->ibdev->phys_port_cnt;
|
|
for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
|
|
libdev = smcibdev->ibdev;
|
|
if (!libdev->ops.get_netdev)
|
|
continue;
|
|
lndev = libdev->ops.get_netdev(libdev, i + 1);
|
|
dev_put(lndev);
|
|
if (lndev != ndev)
|
|
continue;
|
|
if (event == NETDEV_REGISTER)
|
|
smcibdev->ndev_ifidx[i] = ndev->ifindex;
|
|
if (event == NETDEV_UNREGISTER)
|
|
smcibdev->ndev_ifidx[i] = 0;
|
|
}
|
|
}
|
|
mutex_unlock(&smc_ib_devices.mutex);
|
|
}
|
|
|
|
/* callback function for ib_register_client() */
|
|
static int smc_ib_add_dev(struct ib_device *ibdev)
|
|
{
|
|
struct smc_ib_device *smcibdev;
|
|
u8 port_cnt;
|
|
int i;
|
|
|
|
if (ibdev->node_type != RDMA_NODE_IB_CA)
|
|
return -EOPNOTSUPP;
|
|
|
|
smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
|
|
if (!smcibdev)
|
|
return -ENOMEM;
|
|
|
|
smcibdev->ibdev = ibdev;
|
|
INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
|
|
atomic_set(&smcibdev->lnk_cnt, 0);
|
|
init_waitqueue_head(&smcibdev->lnks_deleted);
|
|
mutex_init(&smcibdev->mutex);
|
|
mutex_lock(&smc_ib_devices.mutex);
|
|
list_add_tail(&smcibdev->list, &smc_ib_devices.list);
|
|
mutex_unlock(&smc_ib_devices.mutex);
|
|
ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
|
|
INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
|
|
smc_ib_global_event_handler);
|
|
ib_register_event_handler(&smcibdev->event_handler);
|
|
|
|
/* trigger reading of the port attributes */
|
|
port_cnt = smcibdev->ibdev->phys_port_cnt;
|
|
pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
|
|
smcibdev->ibdev->name, port_cnt);
|
|
for (i = 0;
|
|
i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
|
|
i++) {
|
|
set_bit(i, &smcibdev->port_event_mask);
|
|
/* determine pnetids of the port */
|
|
if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
|
|
smcibdev->pnetid[i]))
|
|
smc_pnetid_by_table_ib(smcibdev, i + 1);
|
|
smc_copy_netdev_ifindex(smcibdev, i);
|
|
pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
|
|
"%.16s%s\n",
|
|
smcibdev->ibdev->name, i + 1,
|
|
smcibdev->pnetid[i],
|
|
smcibdev->pnetid_by_user[i] ?
|
|
" (user defined)" :
|
|
"");
|
|
}
|
|
schedule_work(&smcibdev->port_event_work);
|
|
return 0;
|
|
}
|
|
|
|
/* callback function for ib_unregister_client() */
|
|
static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
|
|
{
|
|
struct smc_ib_device *smcibdev = client_data;
|
|
|
|
mutex_lock(&smc_ib_devices.mutex);
|
|
list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
|
|
mutex_unlock(&smc_ib_devices.mutex);
|
|
pr_warn_ratelimited("smc: removing ib device %s\n",
|
|
smcibdev->ibdev->name);
|
|
smc_smcr_terminate_all(smcibdev);
|
|
smc_ib_cleanup_per_ibdev(smcibdev);
|
|
ib_unregister_event_handler(&smcibdev->event_handler);
|
|
cancel_work_sync(&smcibdev->port_event_work);
|
|
kfree(smcibdev);
|
|
}
|
|
|
|
static struct ib_client smc_ib_client = {
|
|
.name = "smc_ib",
|
|
.add = smc_ib_add_dev,
|
|
.remove = smc_ib_remove_dev,
|
|
};
|
|
|
|
int __init smc_ib_register_client(void)
|
|
{
|
|
smc_ib_init_local_systemid();
|
|
return ib_register_client(&smc_ib_client);
|
|
}
|
|
|
|
void smc_ib_unregister_client(void)
|
|
{
|
|
ib_unregister_client(&smc_ib_client);
|
|
}
|