![Dasaratharaman Chandramouli](/assets/img/avatar_default.png)
rdma_ah_attr can now be either ib or roce allowing core components to use one type or the other and also to define attributes unique to a specific type. struct ib_ah is also initialized with the type when its first created. This ensures that calls such as modify_ah dont modify the type of the address handle attribute. Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Don Hiatt <don.hiatt@intel.com> Reviewed-by: Sean Hefty <sean.hefty@intel.com> Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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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 <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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int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
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struct ib_mr **mr)
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{
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int rc;
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if (*mr)
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return 0; /* already done */
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/* obtain unique key -
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* next invocation of get_dma_mr returns a different key!
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*/
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*mr = pd->device->get_dma_mr(pd, access_flags);
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rc = PTR_ERR_OR_ZERO(*mr);
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if (IS_ERR(*mr))
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*mr = NULL;
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return rc;
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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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/* 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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}
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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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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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/* fall through */
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case IB_EVENT_DEVICE_FATAL:
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/* tbd in follow-on patch:
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* abnormal close of corresponding connections
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*/
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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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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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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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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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/* tbd in follow-on patch:
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* abnormal close of corresponding connections
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*/
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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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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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.max_send_wr = SMC_WR_BUF_CNT,
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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_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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/* map a new TX or RX buffer to DMA */
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int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size,
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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 rc = 0;
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if (buf_slot->dma_addr[SMC_SINGLE_LINK])
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return rc; /* already mapped */
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buf_slot->dma_addr[SMC_SINGLE_LINK] =
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ib_dma_map_single(smcibdev->ibdev, buf_slot->cpu_addr,
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buf_size, data_direction);
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if (ib_dma_mapping_error(smcibdev->ibdev,
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buf_slot->dma_addr[SMC_SINGLE_LINK]))
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rc = -EIO;
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return rc;
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}
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void smc_ib_buf_unmap(struct smc_ib_device *smcibdev, int buf_size,
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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->dma_addr[SMC_SINGLE_LINK])
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return; /* already unmapped */
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ib_dma_unmap_single(smcibdev->ibdev, *buf_slot->dma_addr, buf_size,
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data_direction);
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buf_slot->dma_addr[SMC_SINGLE_LINK] = 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 net_device *ndev;
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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], NULL);
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/* the SMC protocol requires specification of the roce MAC address;
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* if net_device cannot be determined, it can be derived from gid 0
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*/
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ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport);
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if (ndev) {
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memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN);
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} else if (!rc) {
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memcpy(&smcibdev->mac[ibport - 1][0],
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&smcibdev->gid[ibport - 1].raw[8], 3);
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memcpy(&smcibdev->mac[ibport - 1][3],
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&smcibdev->gid[ibport - 1].raw[13], 3);
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smcibdev->mac[ibport - 1][0] &= ~0x02;
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}
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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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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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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);
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if (IS_ERR(smcibdev->roce_cq_send)) {
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smcibdev->roce_cq_send = NULL;
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return rc;
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}
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smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
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smc_wr_rx_cq_handler, NULL,
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smcibdev, &cqattr);
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rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
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if (IS_ERR(smcibdev->roce_cq_recv)) {
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smcibdev->roce_cq_recv = NULL;
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goto err;
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}
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INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
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smc_ib_global_event_handler);
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ib_register_event_handler(&smcibdev->event_handler);
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smc_wr_add_dev(smcibdev);
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smcibdev->initialized = 1;
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return rc;
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err:
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ib_destroy_cq(smcibdev->roce_cq_send);
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return rc;
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}
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static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
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{
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if (!smcibdev->initialized)
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return;
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smc_wr_remove_dev(smcibdev);
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ib_unregister_event_handler(&smcibdev->event_handler);
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ib_destroy_cq(smcibdev->roce_cq_recv);
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ib_destroy_cq(smcibdev->roce_cq_send);
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}
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static struct ib_client smc_ib_client;
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/* callback function for ib_register_client() */
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static void smc_ib_add_dev(struct ib_device *ibdev)
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{
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struct smc_ib_device *smcibdev;
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if (ibdev->node_type != RDMA_NODE_IB_CA)
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return;
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smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
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if (!smcibdev)
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return;
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smcibdev->ibdev = ibdev;
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INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
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spin_lock(&smc_ib_devices.lock);
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list_add_tail(&smcibdev->list, &smc_ib_devices.list);
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spin_unlock(&smc_ib_devices.lock);
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ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
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}
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/* callback function for ib_register_client() */
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static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
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{
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struct smc_ib_device *smcibdev;
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smcibdev = ib_get_client_data(ibdev, &smc_ib_client);
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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);
|
|
}
|