![Ursula Braun](/assets/img/avatar_default.png)
RoCE device changes cause an IB event, processed in the global event handler for the ROCE device. Problems for a certain Queue Pair cause a QP event, processed in the QP event handler for this QP. Among those events are port errors and other fatal device errors. All link groups using such a port or device must be terminated in those cases. Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
536 lines
14 KiB
C
536 lines
14 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 <rdma/ib_verbs.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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#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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.lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock),
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.list = LIST_HEAD_INIT(smc_ib_devices.list),
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};
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#define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%"
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u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system
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* identifier
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*/
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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, 0, 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 =
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container_of(lnk, struct smc_link_group, lnk[0]);
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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 void smc_ib_port_terminate(struct smc_ib_device *smcibdev, u8 ibport)
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{
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struct smc_link_group *lgr, *l;
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list_for_each_entry_safe(lgr, l, &smc_lgr_list.list, list) {
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if (lgr->lnk[SMC_SINGLE_LINK].smcibdev == smcibdev &&
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lgr->lnk[SMC_SINGLE_LINK].ibport == ibport)
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smc_lgr_terminate(lgr);
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}
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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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smc_ib_port_terminate(smcibdev, port_idx + 1);
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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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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_PORT_ERR:
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case IB_EVENT_DEVICE_FATAL:
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case IB_EVENT_PORT_ACTIVE:
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port_idx = ibevent->element.port_num - 1;
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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 void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
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{
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struct smc_ib_device *smcibdev =
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(struct smc_ib_device *)ibevent->device;
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u8 port_idx;
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switch (ibevent->event) {
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case IB_EVENT_DEVICE_FATAL:
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case IB_EVENT_GID_CHANGE:
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case IB_EVENT_PORT_ERR:
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case IB_EVENT_QP_ACCESS_ERR:
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port_idx = ibevent->element.port_num - 1;
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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_destroy_queue_pair(struct smc_link *lnk)
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{
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if (lnk->roce_qp)
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ib_destroy_qp(lnk->roce_qp);
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lnk->roce_qp = NULL;
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}
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/* create a queue pair within the protection domain for a link */
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int smc_ib_create_queue_pair(struct smc_link *lnk)
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{
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struct ib_qp_init_attr qp_attr = {
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.event_handler = smc_ib_qp_event_handler,
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.qp_context = lnk,
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.send_cq = lnk->smcibdev->roce_cq_send,
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.recv_cq = lnk->smcibdev->roce_cq_recv,
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.srq = NULL,
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.cap = {
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/* include unsolicited rdma_writes as well,
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* there are max. 2 RDMA_WRITE per 1 WR_SEND
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*/
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.max_send_wr = SMC_WR_BUF_CNT * 3,
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.max_recv_wr = SMC_WR_BUF_CNT * 3,
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.max_send_sge = SMC_IB_MAX_SEND_SGE,
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.max_recv_sge = 1,
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},
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.sq_sig_type = IB_SIGNAL_REQ_WR,
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.qp_type = IB_QPT_RC,
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};
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int rc;
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lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
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rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
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if (IS_ERR(lnk->roce_qp))
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lnk->roce_qp = NULL;
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else
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smc_wr_remember_qp_attr(lnk);
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return rc;
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}
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void smc_ib_put_memory_region(struct ib_mr *mr)
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{
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ib_dereg_mr(mr);
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}
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static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot)
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{
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unsigned int offset = 0;
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int sg_num;
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/* map the largest prefix of a dma mapped SG list */
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sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK],
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buf_slot->sgt[SMC_SINGLE_LINK].sgl,
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buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
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&offset, PAGE_SIZE);
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return sg_num;
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}
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/* Allocate a memory region and map the dma mapped SG list of buf_slot */
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int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
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struct smc_buf_desc *buf_slot)
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{
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if (buf_slot->mr_rx[SMC_SINGLE_LINK])
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return 0; /* already done */
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buf_slot->mr_rx[SMC_SINGLE_LINK] =
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ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
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if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) {
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int rc;
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rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]);
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buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL;
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return rc;
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}
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if (smc_ib_map_mr_sg(buf_slot) != 1)
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return -EINVAL;
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return 0;
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}
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/* synchronize buffer usage for cpu access */
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void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction)
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{
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struct scatterlist *sg;
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unsigned int i;
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/* for now there is just one DMA address */
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for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg,
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buf_slot->sgt[SMC_SINGLE_LINK].nents, i) {
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if (!sg_dma_len(sg))
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break;
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ib_dma_sync_single_for_cpu(smcibdev->ibdev,
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sg_dma_address(sg),
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sg_dma_len(sg),
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data_direction);
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}
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}
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/* synchronize buffer usage for device access */
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void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction)
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{
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struct scatterlist *sg;
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unsigned int i;
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/* for now there is just one DMA address */
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for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg,
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buf_slot->sgt[SMC_SINGLE_LINK].nents, i) {
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if (!sg_dma_len(sg))
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break;
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ib_dma_sync_single_for_device(smcibdev->ibdev,
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sg_dma_address(sg),
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sg_dma_len(sg),
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data_direction);
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}
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}
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/* Map a new TX or RX buffer SG-table to DMA */
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int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction)
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{
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int mapped_nents;
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mapped_nents = ib_dma_map_sg(smcibdev->ibdev,
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buf_slot->sgt[SMC_SINGLE_LINK].sgl,
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buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
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data_direction);
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if (!mapped_nents)
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return -ENOMEM;
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return mapped_nents;
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}
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void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction)
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{
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if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address)
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return; /* already unmapped */
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ib_dma_unmap_sg(smcibdev->ibdev,
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buf_slot->sgt[SMC_SINGLE_LINK].sgl,
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buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
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data_direction);
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buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0;
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}
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static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport)
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{
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struct ib_gid_attr gattr;
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int rc;
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rc = ib_query_gid(smcibdev->ibdev, ibport, 0,
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&smcibdev->gid[ibport - 1], &gattr);
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if (rc || !gattr.ndev)
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return -ENODEV;
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memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN);
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dev_put(gattr.ndev);
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return 0;
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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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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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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_gid_and_mac(smcibdev, ibport);
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if (rc)
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goto out;
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if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET,
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sizeof(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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long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
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{
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struct ib_cq_init_attr cqattr = {
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.cqe = SMC_WR_MAX_CQE, .comp_vector = 0 };
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long rc;
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smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
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smc_wr_tx_cq_handler, NULL,
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smcibdev, &cqattr);
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rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
|
|
if (IS_ERR(smcibdev->roce_cq_send)) {
|
|
smcibdev->roce_cq_send = NULL;
|
|
return rc;
|
|
}
|
|
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;
|
|
}
|
|
INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
|
|
smc_ib_global_event_handler);
|
|
ib_register_event_handler(&smcibdev->event_handler);
|
|
smc_wr_add_dev(smcibdev);
|
|
smcibdev->initialized = 1;
|
|
return rc;
|
|
|
|
err:
|
|
ib_destroy_cq(smcibdev->roce_cq_send);
|
|
return rc;
|
|
}
|
|
|
|
static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
|
|
{
|
|
if (!smcibdev->initialized)
|
|
return;
|
|
smcibdev->initialized = 0;
|
|
smc_wr_remove_dev(smcibdev);
|
|
ib_unregister_event_handler(&smcibdev->event_handler);
|
|
ib_destroy_cq(smcibdev->roce_cq_recv);
|
|
ib_destroy_cq(smcibdev->roce_cq_send);
|
|
}
|
|
|
|
static struct ib_client smc_ib_client;
|
|
|
|
/* callback function for ib_register_client() */
|
|
static void smc_ib_add_dev(struct ib_device *ibdev)
|
|
{
|
|
struct smc_ib_device *smcibdev;
|
|
|
|
if (ibdev->node_type != RDMA_NODE_IB_CA)
|
|
return;
|
|
|
|
smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
|
|
if (!smcibdev)
|
|
return;
|
|
|
|
smcibdev->ibdev = ibdev;
|
|
INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
|
|
|
|
spin_lock(&smc_ib_devices.lock);
|
|
list_add_tail(&smcibdev->list, &smc_ib_devices.list);
|
|
spin_unlock(&smc_ib_devices.lock);
|
|
ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
|
|
}
|
|
|
|
/* callback function for ib_register_client() */
|
|
static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
|
|
{
|
|
struct smc_ib_device *smcibdev;
|
|
|
|
smcibdev = ib_get_client_data(ibdev, &smc_ib_client);
|
|
ib_set_client_data(ibdev, &smc_ib_client, NULL);
|
|
spin_lock(&smc_ib_devices.lock);
|
|
list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
|
|
spin_unlock(&smc_ib_devices.lock);
|
|
smc_pnet_remove_by_ibdev(smcibdev);
|
|
smc_ib_cleanup_per_ibdev(smcibdev);
|
|
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)
|
|
{
|
|
return ib_register_client(&smc_ib_client);
|
|
}
|
|
|
|
void smc_ib_unregister_client(void)
|
|
{
|
|
ib_unregister_client(&smc_ib_client);
|
|
}
|