1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2a4cf0443SUrsula Braun /* 3a4cf0443SUrsula Braun * Shared Memory Communications over RDMA (SMC-R) and RoCE 4a4cf0443SUrsula Braun * 5a4cf0443SUrsula Braun * IB infrastructure: 6a4cf0443SUrsula Braun * Establish SMC-R as an Infiniband Client to be notified about added and 7a4cf0443SUrsula Braun * removed IB devices of type RDMA. 8a4cf0443SUrsula Braun * Determine device and port characteristics for these IB devices. 9a4cf0443SUrsula Braun * 10a4cf0443SUrsula Braun * Copyright IBM Corp. 2016 11a4cf0443SUrsula Braun * 12a4cf0443SUrsula Braun * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 13a4cf0443SUrsula Braun */ 14a4cf0443SUrsula Braun 15a4cf0443SUrsula Braun #include <linux/random.h> 16bd4ad577SUrsula Braun #include <linux/workqueue.h> 1710428dd8SUrsula Braun #include <linux/scatterlist.h> 186dabd405SUrsula Braun #include <linux/wait.h> 19a4cf0443SUrsula Braun #include <rdma/ib_verbs.h> 20ddb457c6SParav Pandit #include <rdma/ib_cache.h> 21a4cf0443SUrsula Braun 226812baabSThomas Richter #include "smc_pnet.h" 23a4cf0443SUrsula Braun #include "smc_ib.h" 24cd6851f3SUrsula Braun #include "smc_core.h" 25f38ba179SUrsula Braun #include "smc_wr.h" 26a4cf0443SUrsula Braun #include "smc.h" 27a4cf0443SUrsula Braun 28c9f4c6cfSUrsula Braun #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 29c9f4c6cfSUrsula Braun 30bd4ad577SUrsula Braun #define SMC_QP_MIN_RNR_TIMER 5 31bd4ad577SUrsula Braun #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 32bd4ad577SUrsula Braun #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 33bd4ad577SUrsula Braun #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 34bd4ad577SUrsula Braun 35a4cf0443SUrsula Braun struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 36a4cf0443SUrsula Braun .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 37a4cf0443SUrsula Braun .list = LIST_HEAD_INIT(smc_ib_devices.list), 38a4cf0443SUrsula Braun }; 39a4cf0443SUrsula Braun 40a4cf0443SUrsula Braun #define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" 41a4cf0443SUrsula Braun 42a4cf0443SUrsula Braun u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system 43a4cf0443SUrsula Braun * identifier 44a4cf0443SUrsula Braun */ 45a4cf0443SUrsula Braun 46bd4ad577SUrsula Braun static int smc_ib_modify_qp_init(struct smc_link *lnk) 47bd4ad577SUrsula Braun { 48bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 49bd4ad577SUrsula Braun 50bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 51bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_INIT; 52bd4ad577SUrsula Braun qp_attr.pkey_index = 0; 53bd4ad577SUrsula Braun qp_attr.port_num = lnk->ibport; 54bd4ad577SUrsula Braun qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 55bd4ad577SUrsula Braun | IB_ACCESS_REMOTE_WRITE; 56bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 57bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_PKEY_INDEX | 58bd4ad577SUrsula Braun IB_QP_ACCESS_FLAGS | IB_QP_PORT); 59bd4ad577SUrsula Braun } 60bd4ad577SUrsula Braun 61bd4ad577SUrsula Braun static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 62bd4ad577SUrsula Braun { 63bd4ad577SUrsula Braun enum ib_qp_attr_mask qp_attr_mask = 64bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 65bd4ad577SUrsula Braun IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 66bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 67bd4ad577SUrsula Braun 68bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 69bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTR; 70bd4ad577SUrsula Braun qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 7144c58487SDasaratharaman Chandramouli qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 72d8966fcdSDasaratharaman Chandramouli rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 737005ada6SUrsula Braun rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0); 74d8966fcdSDasaratharaman Chandramouli rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 7544c58487SDasaratharaman Chandramouli memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 76bd4ad577SUrsula Braun sizeof(lnk->peer_mac)); 77bd4ad577SUrsula Braun qp_attr.dest_qp_num = lnk->peer_qpn; 78bd4ad577SUrsula Braun qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 79bd4ad577SUrsula Braun qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 80bd4ad577SUrsula Braun * requests 81bd4ad577SUrsula Braun */ 82bd4ad577SUrsula Braun qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 83bd4ad577SUrsula Braun 84bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 85bd4ad577SUrsula Braun } 86bd4ad577SUrsula Braun 87bd4ad577SUrsula Braun int smc_ib_modify_qp_rts(struct smc_link *lnk) 88bd4ad577SUrsula Braun { 89bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 90bd4ad577SUrsula Braun 91bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 92bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTS; 93bd4ad577SUrsula Braun qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 94bd4ad577SUrsula Braun qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 95bd4ad577SUrsula Braun qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 96bd4ad577SUrsula Braun qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 97bd4ad577SUrsula Braun qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 98bd4ad577SUrsula Braun * atomic ops allowed 99bd4ad577SUrsula Braun */ 100bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 101bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 102bd4ad577SUrsula Braun IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 103bd4ad577SUrsula Braun IB_QP_MAX_QP_RD_ATOMIC); 104bd4ad577SUrsula Braun } 105bd4ad577SUrsula Braun 106bd4ad577SUrsula Braun int smc_ib_modify_qp_reset(struct smc_link *lnk) 107bd4ad577SUrsula Braun { 108bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 109bd4ad577SUrsula Braun 110bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 111bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RESET; 112bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 113bd4ad577SUrsula Braun } 114bd4ad577SUrsula Braun 115bd4ad577SUrsula Braun int smc_ib_ready_link(struct smc_link *lnk) 116bd4ad577SUrsula Braun { 11700e5fb26SStefan Raspl struct smc_link_group *lgr = smc_get_lgr(lnk); 118bd4ad577SUrsula Braun int rc = 0; 119bd4ad577SUrsula Braun 120bd4ad577SUrsula Braun rc = smc_ib_modify_qp_init(lnk); 121bd4ad577SUrsula Braun if (rc) 122bd4ad577SUrsula Braun goto out; 123bd4ad577SUrsula Braun 124bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rtr(lnk); 125bd4ad577SUrsula Braun if (rc) 126bd4ad577SUrsula Braun goto out; 127bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 128bd4ad577SUrsula Braun rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 129bd4ad577SUrsula Braun IB_CQ_SOLICITED_MASK); 130bd4ad577SUrsula Braun if (rc) 131bd4ad577SUrsula Braun goto out; 132bd4ad577SUrsula Braun rc = smc_wr_rx_post_init(lnk); 133bd4ad577SUrsula Braun if (rc) 134bd4ad577SUrsula Braun goto out; 135bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 136bd4ad577SUrsula Braun 137bd4ad577SUrsula Braun if (lgr->role == SMC_SERV) { 138bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rts(lnk); 139bd4ad577SUrsula Braun if (rc) 140bd4ad577SUrsula Braun goto out; 141bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 142bd4ad577SUrsula Braun } 143bd4ad577SUrsula Braun out: 144bd4ad577SUrsula Braun return rc; 145bd4ad577SUrsula Braun } 146bd4ad577SUrsula Braun 1477005ada6SUrsula Braun static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) 148be6a3f38SUrsula Braun { 149b4c296f9SJason Gunthorpe const struct ib_gid_attr *attr; 1505102eca9SParav Pandit int rc; 151be6a3f38SUrsula Braun 152b4c296f9SJason Gunthorpe attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); 153b4c296f9SJason Gunthorpe if (IS_ERR(attr)) 154be6a3f38SUrsula Braun return -ENODEV; 155be6a3f38SUrsula Braun 1565102eca9SParav Pandit rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]); 157b4c296f9SJason Gunthorpe rdma_put_gid_attr(attr); 158b4c296f9SJason Gunthorpe return rc; 159be6a3f38SUrsula Braun } 160be6a3f38SUrsula Braun 161be6a3f38SUrsula Braun /* Create an identifier unique for this instance of SMC-R. 162be6a3f38SUrsula Braun * The MAC-address of the first active registered IB device 163be6a3f38SUrsula Braun * plus a random 2-byte number is used to create this identifier. 164be6a3f38SUrsula Braun * This name is delivered to the peer during connection initialization. 165be6a3f38SUrsula Braun */ 166be6a3f38SUrsula Braun static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 167be6a3f38SUrsula Braun u8 ibport) 168be6a3f38SUrsula Braun { 169be6a3f38SUrsula Braun memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 170be6a3f38SUrsula Braun sizeof(smcibdev->mac[ibport - 1])); 171be6a3f38SUrsula Braun get_random_bytes(&local_systemid[0], 2); 172be6a3f38SUrsula Braun } 173be6a3f38SUrsula Braun 174be6a3f38SUrsula Braun bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 175be6a3f38SUrsula Braun { 176be6a3f38SUrsula Braun return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 177be6a3f38SUrsula Braun } 178be6a3f38SUrsula Braun 1797005ada6SUrsula Braun /* determine the gid for an ib-device port and vlan id */ 1807005ada6SUrsula Braun int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 1817005ada6SUrsula Braun unsigned short vlan_id, u8 gid[], u8 *sgid_index) 1827005ada6SUrsula Braun { 183b4c296f9SJason Gunthorpe const struct ib_gid_attr *attr; 1845102eca9SParav Pandit const struct net_device *ndev; 1857005ada6SUrsula Braun int i; 1867005ada6SUrsula Braun 1877005ada6SUrsula Braun for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 188b4c296f9SJason Gunthorpe attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 189b4c296f9SJason Gunthorpe if (IS_ERR(attr)) 1907005ada6SUrsula Braun continue; 191b4c296f9SJason Gunthorpe 1925102eca9SParav Pandit rcu_read_lock(); 1935102eca9SParav Pandit ndev = rdma_read_gid_attr_ndev_rcu(attr); 1945102eca9SParav Pandit if (!IS_ERR(ndev) && 195b4c296f9SJason Gunthorpe ((!vlan_id && !is_vlan_dev(attr->ndev)) || 196b4c296f9SJason Gunthorpe (vlan_id && is_vlan_dev(attr->ndev) && 197b4c296f9SJason Gunthorpe vlan_dev_vlan_id(attr->ndev) == vlan_id)) && 198b4c296f9SJason Gunthorpe attr->gid_type == IB_GID_TYPE_ROCE) { 1995102eca9SParav Pandit rcu_read_unlock(); 2007005ada6SUrsula Braun if (gid) 201b4c296f9SJason Gunthorpe memcpy(gid, &attr->gid, SMC_GID_SIZE); 2027005ada6SUrsula Braun if (sgid_index) 203b4c296f9SJason Gunthorpe *sgid_index = attr->index; 204b4c296f9SJason Gunthorpe rdma_put_gid_attr(attr); 2057005ada6SUrsula Braun return 0; 2067005ada6SUrsula Braun } 2075102eca9SParav Pandit rcu_read_unlock(); 208b4c296f9SJason Gunthorpe rdma_put_gid_attr(attr); 2097005ada6SUrsula Braun } 2107005ada6SUrsula Braun return -ENODEV; 2117005ada6SUrsula Braun } 2127005ada6SUrsula Braun 213be6a3f38SUrsula Braun static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 214be6a3f38SUrsula Braun { 215be6a3f38SUrsula Braun int rc; 216be6a3f38SUrsula Braun 217be6a3f38SUrsula Braun memset(&smcibdev->pattr[ibport - 1], 0, 218be6a3f38SUrsula Braun sizeof(smcibdev->pattr[ibport - 1])); 219be6a3f38SUrsula Braun rc = ib_query_port(smcibdev->ibdev, ibport, 220be6a3f38SUrsula Braun &smcibdev->pattr[ibport - 1]); 221be6a3f38SUrsula Braun if (rc) 222be6a3f38SUrsula Braun goto out; 223be6a3f38SUrsula Braun /* the SMC protocol requires specification of the RoCE MAC address */ 2247005ada6SUrsula Braun rc = smc_ib_fill_mac(smcibdev, ibport); 225be6a3f38SUrsula Braun if (rc) 226be6a3f38SUrsula Braun goto out; 227be6a3f38SUrsula Braun if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, 228be6a3f38SUrsula Braun sizeof(local_systemid)) && 229be6a3f38SUrsula Braun smc_ib_port_active(smcibdev, ibport)) 230be6a3f38SUrsula Braun /* create unique system identifier */ 231be6a3f38SUrsula Braun smc_ib_define_local_systemid(smcibdev, ibport); 232be6a3f38SUrsula Braun out: 233be6a3f38SUrsula Braun return rc; 234be6a3f38SUrsula Braun } 235be6a3f38SUrsula Braun 236bd4ad577SUrsula Braun /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 237bd4ad577SUrsula Braun static void smc_ib_port_event_work(struct work_struct *work) 238bd4ad577SUrsula Braun { 239bd4ad577SUrsula Braun struct smc_ib_device *smcibdev = container_of( 240bd4ad577SUrsula Braun work, struct smc_ib_device, port_event_work); 241bd4ad577SUrsula Braun u8 port_idx; 242bd4ad577SUrsula Braun 243bd4ad577SUrsula Braun for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 244bd4ad577SUrsula Braun smc_ib_remember_port_attr(smcibdev, port_idx + 1); 245bd4ad577SUrsula Braun clear_bit(port_idx, &smcibdev->port_event_mask); 246c3d9494eSUrsula Braun if (!smc_ib_port_active(smcibdev, port_idx + 1)) { 247c3d9494eSUrsula Braun set_bit(port_idx, smcibdev->ports_going_away); 2489fda3510SHans Wippel smc_port_terminate(smcibdev, port_idx + 1); 249c3d9494eSUrsula Braun } else { 250c3d9494eSUrsula Braun clear_bit(port_idx, smcibdev->ports_going_away); 251c3d9494eSUrsula Braun } 252bd4ad577SUrsula Braun } 253bd4ad577SUrsula Braun } 254bd4ad577SUrsula Braun 255bd4ad577SUrsula Braun /* can be called in IRQ context */ 256bd4ad577SUrsula Braun static void smc_ib_global_event_handler(struct ib_event_handler *handler, 257bd4ad577SUrsula Braun struct ib_event *ibevent) 258bd4ad577SUrsula Braun { 259bd4ad577SUrsula Braun struct smc_ib_device *smcibdev; 260bd4ad577SUrsula Braun u8 port_idx; 261bd4ad577SUrsula Braun 262bd4ad577SUrsula Braun smcibdev = container_of(handler, struct smc_ib_device, event_handler); 263bd4ad577SUrsula Braun 264bd4ad577SUrsula Braun switch (ibevent->event) { 265bd4ad577SUrsula Braun case IB_EVENT_DEVICE_FATAL: 26681cf6430SKarsten Graul /* terminate all ports on device */ 267c3d9494eSUrsula Braun for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 268bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 269c3d9494eSUrsula Braun set_bit(port_idx, smcibdev->ports_going_away); 270c3d9494eSUrsula Braun } 271bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 272bd4ad577SUrsula Braun break; 27381cf6430SKarsten Graul case IB_EVENT_PORT_ERR: 27481cf6430SKarsten Graul case IB_EVENT_PORT_ACTIVE: 27581cf6430SKarsten Graul case IB_EVENT_GID_CHANGE: 27681cf6430SKarsten Graul port_idx = ibevent->element.port_num - 1; 27781cf6430SKarsten Graul if (port_idx < SMC_MAX_PORTS) { 27881cf6430SKarsten Graul set_bit(port_idx, &smcibdev->port_event_mask); 279c3d9494eSUrsula Braun if (ibevent->event == IB_EVENT_PORT_ERR) 280c3d9494eSUrsula Braun set_bit(port_idx, smcibdev->ports_going_away); 281c3d9494eSUrsula Braun else if (ibevent->event == IB_EVENT_PORT_ACTIVE) 282c3d9494eSUrsula Braun clear_bit(port_idx, smcibdev->ports_going_away); 28381cf6430SKarsten Graul schedule_work(&smcibdev->port_event_work); 28481cf6430SKarsten Graul } 28581cf6430SKarsten Graul break; 286bd4ad577SUrsula Braun default: 287bd4ad577SUrsula Braun break; 288bd4ad577SUrsula Braun } 289bd4ad577SUrsula Braun } 290bd4ad577SUrsula Braun 291f38ba179SUrsula Braun void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 292f38ba179SUrsula Braun { 293da05bf29SUrsula Braun if (lnk->roce_pd) 294f38ba179SUrsula Braun ib_dealloc_pd(lnk->roce_pd); 295f38ba179SUrsula Braun lnk->roce_pd = NULL; 296f38ba179SUrsula Braun } 297f38ba179SUrsula Braun 298f38ba179SUrsula Braun int smc_ib_create_protection_domain(struct smc_link *lnk) 299f38ba179SUrsula Braun { 300f38ba179SUrsula Braun int rc; 301f38ba179SUrsula Braun 302897e1c24SUrsula Braun lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 303f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 304f38ba179SUrsula Braun if (IS_ERR(lnk->roce_pd)) 305f38ba179SUrsula Braun lnk->roce_pd = NULL; 306f38ba179SUrsula Braun return rc; 307f38ba179SUrsula Braun } 308f38ba179SUrsula Braun 309f38ba179SUrsula Braun static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 310f38ba179SUrsula Braun { 311e5f3aa04SKarsten Graul struct smc_link *lnk = (struct smc_link *)priv; 312e5f3aa04SKarsten Graul struct smc_ib_device *smcibdev = lnk->smcibdev; 313da05bf29SUrsula Braun u8 port_idx; 314da05bf29SUrsula Braun 315f38ba179SUrsula Braun switch (ibevent->event) { 31681cf6430SKarsten Graul case IB_EVENT_QP_FATAL: 317f38ba179SUrsula Braun case IB_EVENT_QP_ACCESS_ERR: 318e5f3aa04SKarsten Graul port_idx = ibevent->element.qp->port - 1; 31981cf6430SKarsten Graul if (port_idx < SMC_MAX_PORTS) { 320da05bf29SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 321c3d9494eSUrsula Braun set_bit(port_idx, smcibdev->ports_going_away); 322da05bf29SUrsula Braun schedule_work(&smcibdev->port_event_work); 32381cf6430SKarsten Graul } 324f38ba179SUrsula Braun break; 325f38ba179SUrsula Braun default: 326f38ba179SUrsula Braun break; 327f38ba179SUrsula Braun } 328f38ba179SUrsula Braun } 329f38ba179SUrsula Braun 330f38ba179SUrsula Braun void smc_ib_destroy_queue_pair(struct smc_link *lnk) 331f38ba179SUrsula Braun { 332da05bf29SUrsula Braun if (lnk->roce_qp) 333f38ba179SUrsula Braun ib_destroy_qp(lnk->roce_qp); 334f38ba179SUrsula Braun lnk->roce_qp = NULL; 335f38ba179SUrsula Braun } 336f38ba179SUrsula Braun 337f38ba179SUrsula Braun /* create a queue pair within the protection domain for a link */ 338f38ba179SUrsula Braun int smc_ib_create_queue_pair(struct smc_link *lnk) 339f38ba179SUrsula Braun { 340f38ba179SUrsula Braun struct ib_qp_init_attr qp_attr = { 341f38ba179SUrsula Braun .event_handler = smc_ib_qp_event_handler, 342f38ba179SUrsula Braun .qp_context = lnk, 343f38ba179SUrsula Braun .send_cq = lnk->smcibdev->roce_cq_send, 344f38ba179SUrsula Braun .recv_cq = lnk->smcibdev->roce_cq_recv, 345f38ba179SUrsula Braun .srq = NULL, 346f38ba179SUrsula Braun .cap = { 347f38ba179SUrsula Braun /* include unsolicited rdma_writes as well, 348f38ba179SUrsula Braun * there are max. 2 RDMA_WRITE per 1 WR_SEND 349f38ba179SUrsula Braun */ 350652a1e41SUrsula Braun .max_send_wr = SMC_WR_BUF_CNT * 3, 351f38ba179SUrsula Braun .max_recv_wr = SMC_WR_BUF_CNT * 3, 352f38ba179SUrsula Braun .max_send_sge = SMC_IB_MAX_SEND_SGE, 353f38ba179SUrsula Braun .max_recv_sge = 1, 354f38ba179SUrsula Braun }, 355f38ba179SUrsula Braun .sq_sig_type = IB_SIGNAL_REQ_WR, 356f38ba179SUrsula Braun .qp_type = IB_QPT_RC, 357f38ba179SUrsula Braun }; 358f38ba179SUrsula Braun int rc; 359f38ba179SUrsula Braun 360f38ba179SUrsula Braun lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 361f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 362f38ba179SUrsula Braun if (IS_ERR(lnk->roce_qp)) 363f38ba179SUrsula Braun lnk->roce_qp = NULL; 364f38ba179SUrsula Braun else 365f38ba179SUrsula Braun smc_wr_remember_qp_attr(lnk); 366f38ba179SUrsula Braun return rc; 367f38ba179SUrsula Braun } 368f38ba179SUrsula Braun 369897e1c24SUrsula Braun void smc_ib_put_memory_region(struct ib_mr *mr) 370897e1c24SUrsula Braun { 371897e1c24SUrsula Braun ib_dereg_mr(mr); 372897e1c24SUrsula Braun } 373897e1c24SUrsula Braun 374897e1c24SUrsula Braun static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 375897e1c24SUrsula Braun { 376897e1c24SUrsula Braun unsigned int offset = 0; 377897e1c24SUrsula Braun int sg_num; 378897e1c24SUrsula Braun 379897e1c24SUrsula Braun /* map the largest prefix of a dma mapped SG list */ 380897e1c24SUrsula Braun sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 381897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 382897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 383897e1c24SUrsula Braun &offset, PAGE_SIZE); 384897e1c24SUrsula Braun 385897e1c24SUrsula Braun return sg_num; 386897e1c24SUrsula Braun } 387897e1c24SUrsula Braun 388897e1c24SUrsula Braun /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 389897e1c24SUrsula Braun int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 390897e1c24SUrsula Braun struct smc_buf_desc *buf_slot) 391897e1c24SUrsula Braun { 392897e1c24SUrsula Braun if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 393897e1c24SUrsula Braun return 0; /* already done */ 394897e1c24SUrsula Braun 395897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = 396897e1c24SUrsula Braun ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 397897e1c24SUrsula Braun if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 398897e1c24SUrsula Braun int rc; 399897e1c24SUrsula Braun 400897e1c24SUrsula Braun rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 401897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 402897e1c24SUrsula Braun return rc; 403897e1c24SUrsula Braun } 404897e1c24SUrsula Braun 405897e1c24SUrsula Braun if (smc_ib_map_mr_sg(buf_slot) != 1) 406897e1c24SUrsula Braun return -EINVAL; 407897e1c24SUrsula Braun 408897e1c24SUrsula Braun return 0; 409897e1c24SUrsula Braun } 410897e1c24SUrsula Braun 41110428dd8SUrsula Braun /* synchronize buffer usage for cpu access */ 41210428dd8SUrsula Braun void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, 41310428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 41410428dd8SUrsula Braun enum dma_data_direction data_direction) 41510428dd8SUrsula Braun { 41610428dd8SUrsula Braun struct scatterlist *sg; 41710428dd8SUrsula Braun unsigned int i; 41810428dd8SUrsula Braun 41910428dd8SUrsula Braun /* for now there is just one DMA address */ 42010428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 42110428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 42210428dd8SUrsula Braun if (!sg_dma_len(sg)) 42310428dd8SUrsula Braun break; 42410428dd8SUrsula Braun ib_dma_sync_single_for_cpu(smcibdev->ibdev, 42510428dd8SUrsula Braun sg_dma_address(sg), 42610428dd8SUrsula Braun sg_dma_len(sg), 42710428dd8SUrsula Braun data_direction); 42810428dd8SUrsula Braun } 42910428dd8SUrsula Braun } 43010428dd8SUrsula Braun 43110428dd8SUrsula Braun /* synchronize buffer usage for device access */ 43210428dd8SUrsula Braun void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, 43310428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 43410428dd8SUrsula Braun enum dma_data_direction data_direction) 43510428dd8SUrsula Braun { 43610428dd8SUrsula Braun struct scatterlist *sg; 43710428dd8SUrsula Braun unsigned int i; 43810428dd8SUrsula Braun 43910428dd8SUrsula Braun /* for now there is just one DMA address */ 44010428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 44110428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 44210428dd8SUrsula Braun if (!sg_dma_len(sg)) 44310428dd8SUrsula Braun break; 44410428dd8SUrsula Braun ib_dma_sync_single_for_device(smcibdev->ibdev, 44510428dd8SUrsula Braun sg_dma_address(sg), 44610428dd8SUrsula Braun sg_dma_len(sg), 44710428dd8SUrsula Braun data_direction); 44810428dd8SUrsula Braun } 44910428dd8SUrsula Braun } 45010428dd8SUrsula Braun 451a3fe3d01SUrsula Braun /* Map a new TX or RX buffer SG-table to DMA */ 452a3fe3d01SUrsula Braun int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 453a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 454a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 455a3fe3d01SUrsula Braun { 456a3fe3d01SUrsula Braun int mapped_nents; 457a3fe3d01SUrsula Braun 458a3fe3d01SUrsula Braun mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 459a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 460a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 461a3fe3d01SUrsula Braun data_direction); 462a3fe3d01SUrsula Braun if (!mapped_nents) 463a3fe3d01SUrsula Braun return -ENOMEM; 464a3fe3d01SUrsula Braun 465a3fe3d01SUrsula Braun return mapped_nents; 466a3fe3d01SUrsula Braun } 467a3fe3d01SUrsula Braun 468a3fe3d01SUrsula Braun void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 469a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 470a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 471a3fe3d01SUrsula Braun { 472a3fe3d01SUrsula Braun if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 473a3fe3d01SUrsula Braun return; /* already unmapped */ 474a3fe3d01SUrsula Braun 475a3fe3d01SUrsula Braun ib_dma_unmap_sg(smcibdev->ibdev, 476a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 477a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 478a3fe3d01SUrsula Braun data_direction); 479a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 480a3fe3d01SUrsula Braun } 481a3fe3d01SUrsula Braun 482bd4ad577SUrsula Braun long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 483bd4ad577SUrsula Braun { 484bd4ad577SUrsula Braun struct ib_cq_init_attr cqattr = { 485c9f4c6cfSUrsula Braun .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 486c9f4c6cfSUrsula Braun int cqe_size_order, smc_order; 487bd4ad577SUrsula Braun long rc; 488bd4ad577SUrsula Braun 489c9f4c6cfSUrsula Braun /* the calculated number of cq entries fits to mlx5 cq allocation */ 490c9f4c6cfSUrsula Braun cqe_size_order = cache_line_size() == 128 ? 7 : 6; 491c9f4c6cfSUrsula Braun smc_order = MAX_ORDER - cqe_size_order - 1; 492c9f4c6cfSUrsula Braun if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 493c9f4c6cfSUrsula Braun cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 494bd4ad577SUrsula Braun smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 495bd4ad577SUrsula Braun smc_wr_tx_cq_handler, NULL, 496bd4ad577SUrsula Braun smcibdev, &cqattr); 497bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 498bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_send)) { 499bd4ad577SUrsula Braun smcibdev->roce_cq_send = NULL; 500bd4ad577SUrsula Braun return rc; 501bd4ad577SUrsula Braun } 502bd4ad577SUrsula Braun smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 503bd4ad577SUrsula Braun smc_wr_rx_cq_handler, NULL, 504bd4ad577SUrsula Braun smcibdev, &cqattr); 505bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 506bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_recv)) { 507bd4ad577SUrsula Braun smcibdev->roce_cq_recv = NULL; 508bd4ad577SUrsula Braun goto err; 509bd4ad577SUrsula Braun } 510bd4ad577SUrsula Braun smc_wr_add_dev(smcibdev); 511bd4ad577SUrsula Braun smcibdev->initialized = 1; 512bd4ad577SUrsula Braun return rc; 513bd4ad577SUrsula Braun 514bd4ad577SUrsula Braun err: 515bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 516bd4ad577SUrsula Braun return rc; 517bd4ad577SUrsula Braun } 518bd4ad577SUrsula Braun 519bd4ad577SUrsula Braun static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 520bd4ad577SUrsula Braun { 521bd4ad577SUrsula Braun if (!smcibdev->initialized) 522bd4ad577SUrsula Braun return; 523da05bf29SUrsula Braun smcibdev->initialized = 0; 524bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_recv); 525bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 5266a37ad3dSUrsula Braun smc_wr_remove_dev(smcibdev); 527bd4ad577SUrsula Braun } 528bd4ad577SUrsula Braun 529a4cf0443SUrsula Braun static struct ib_client smc_ib_client; 530a4cf0443SUrsula Braun 531a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 532a4cf0443SUrsula Braun static void smc_ib_add_dev(struct ib_device *ibdev) 533a4cf0443SUrsula Braun { 534a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 535be6a3f38SUrsula Braun u8 port_cnt; 536be6a3f38SUrsula Braun int i; 537a4cf0443SUrsula Braun 538a4cf0443SUrsula Braun if (ibdev->node_type != RDMA_NODE_IB_CA) 539a4cf0443SUrsula Braun return; 540a4cf0443SUrsula Braun 541a4cf0443SUrsula Braun smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 542a4cf0443SUrsula Braun if (!smcibdev) 543a4cf0443SUrsula Braun return; 544a4cf0443SUrsula Braun 545a4cf0443SUrsula Braun smcibdev->ibdev = ibdev; 546bd4ad577SUrsula Braun INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 5476dabd405SUrsula Braun atomic_set(&smcibdev->lnk_cnt, 0); 5486dabd405SUrsula Braun init_waitqueue_head(&smcibdev->lnks_deleted); 549a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 550a4cf0443SUrsula Braun list_add_tail(&smcibdev->list, &smc_ib_devices.list); 551a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 552a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 553be6a3f38SUrsula Braun INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 554be6a3f38SUrsula Braun smc_ib_global_event_handler); 555be6a3f38SUrsula Braun ib_register_event_handler(&smcibdev->event_handler); 556be6a3f38SUrsula Braun 557be6a3f38SUrsula Braun /* trigger reading of the port attributes */ 558be6a3f38SUrsula Braun port_cnt = smcibdev->ibdev->phys_port_cnt; 559be6a3f38SUrsula Braun for (i = 0; 560be6a3f38SUrsula Braun i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 5610afff91cSUrsula Braun i++) { 562be6a3f38SUrsula Braun set_bit(i, &smcibdev->port_event_mask); 5630afff91cSUrsula Braun /* determine pnetids of the port */ 5640afff91cSUrsula Braun smc_pnetid_by_dev_port(ibdev->dev.parent, i, 5650afff91cSUrsula Braun smcibdev->pnetid[i]); 5660afff91cSUrsula Braun } 567be6a3f38SUrsula Braun schedule_work(&smcibdev->port_event_work); 568a4cf0443SUrsula Braun } 569a4cf0443SUrsula Braun 5700b29ec64SUrsula Braun /* callback function for ib_unregister_client() */ 571a4cf0443SUrsula Braun static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 572a4cf0443SUrsula Braun { 573a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 574a4cf0443SUrsula Braun 575a4cf0443SUrsula Braun smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 576a2f2ef4aSKarsten Graul if (!smcibdev || smcibdev->ibdev != ibdev) 577a2f2ef4aSKarsten Graul return; 578a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, NULL); 579a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 580a4cf0443SUrsula Braun list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 581a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 5820b29ec64SUrsula Braun smc_smcr_terminate_all(smcibdev); 583bd4ad577SUrsula Braun smc_ib_cleanup_per_ibdev(smcibdev); 584be6a3f38SUrsula Braun ib_unregister_event_handler(&smcibdev->event_handler); 585ece0d7bdSKarsten Graul cancel_work_sync(&smcibdev->port_event_work); 586a4cf0443SUrsula Braun kfree(smcibdev); 587a4cf0443SUrsula Braun } 588a4cf0443SUrsula Braun 589a4cf0443SUrsula Braun static struct ib_client smc_ib_client = { 590a4cf0443SUrsula Braun .name = "smc_ib", 591a4cf0443SUrsula Braun .add = smc_ib_add_dev, 592a4cf0443SUrsula Braun .remove = smc_ib_remove_dev, 593a4cf0443SUrsula Braun }; 594a4cf0443SUrsula Braun 595a4cf0443SUrsula Braun int __init smc_ib_register_client(void) 596a4cf0443SUrsula Braun { 597a4cf0443SUrsula Braun return ib_register_client(&smc_ib_client); 598a4cf0443SUrsula Braun } 599a4cf0443SUrsula Braun 600a4cf0443SUrsula Braun void smc_ib_unregister_client(void) 601a4cf0443SUrsula Braun { 602a4cf0443SUrsula Braun ib_unregister_client(&smc_ib_client); 603a4cf0443SUrsula Braun } 604