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> 18a4cf0443SUrsula Braun #include <rdma/ib_verbs.h> 19ddb457c6SParav Pandit #include <rdma/ib_cache.h> 20a4cf0443SUrsula Braun 216812baabSThomas Richter #include "smc_pnet.h" 22a4cf0443SUrsula Braun #include "smc_ib.h" 23cd6851f3SUrsula Braun #include "smc_core.h" 24f38ba179SUrsula Braun #include "smc_wr.h" 25a4cf0443SUrsula Braun #include "smc.h" 26a4cf0443SUrsula Braun 27c9f4c6cfSUrsula Braun #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 28c9f4c6cfSUrsula Braun 29bd4ad577SUrsula Braun #define SMC_QP_MIN_RNR_TIMER 5 30bd4ad577SUrsula Braun #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 31bd4ad577SUrsula Braun #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 32bd4ad577SUrsula Braun #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 33bd4ad577SUrsula Braun 34a4cf0443SUrsula Braun struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 35a4cf0443SUrsula Braun .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 36a4cf0443SUrsula Braun .list = LIST_HEAD_INIT(smc_ib_devices.list), 37a4cf0443SUrsula Braun }; 38a4cf0443SUrsula Braun 39a4cf0443SUrsula Braun #define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" 40a4cf0443SUrsula Braun 41a4cf0443SUrsula Braun u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system 42a4cf0443SUrsula Braun * identifier 43a4cf0443SUrsula Braun */ 44a4cf0443SUrsula Braun 45bd4ad577SUrsula Braun static int smc_ib_modify_qp_init(struct smc_link *lnk) 46bd4ad577SUrsula Braun { 47bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 48bd4ad577SUrsula Braun 49bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 50bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_INIT; 51bd4ad577SUrsula Braun qp_attr.pkey_index = 0; 52bd4ad577SUrsula Braun qp_attr.port_num = lnk->ibport; 53bd4ad577SUrsula Braun qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 54bd4ad577SUrsula Braun | IB_ACCESS_REMOTE_WRITE; 55bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 56bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_PKEY_INDEX | 57bd4ad577SUrsula Braun IB_QP_ACCESS_FLAGS | IB_QP_PORT); 58bd4ad577SUrsula Braun } 59bd4ad577SUrsula Braun 60bd4ad577SUrsula Braun static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 61bd4ad577SUrsula Braun { 62bd4ad577SUrsula Braun enum ib_qp_attr_mask qp_attr_mask = 63bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 64bd4ad577SUrsula Braun IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 65bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 66bd4ad577SUrsula Braun 67bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 68bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTR; 69bd4ad577SUrsula Braun qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 7044c58487SDasaratharaman Chandramouli qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 71d8966fcdSDasaratharaman Chandramouli rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 727005ada6SUrsula Braun rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0); 73d8966fcdSDasaratharaman Chandramouli rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 7444c58487SDasaratharaman Chandramouli memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 75bd4ad577SUrsula Braun sizeof(lnk->peer_mac)); 76bd4ad577SUrsula Braun qp_attr.dest_qp_num = lnk->peer_qpn; 77bd4ad577SUrsula Braun qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 78bd4ad577SUrsula Braun qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 79bd4ad577SUrsula Braun * requests 80bd4ad577SUrsula Braun */ 81bd4ad577SUrsula Braun qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 82bd4ad577SUrsula Braun 83bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 84bd4ad577SUrsula Braun } 85bd4ad577SUrsula Braun 86bd4ad577SUrsula Braun int smc_ib_modify_qp_rts(struct smc_link *lnk) 87bd4ad577SUrsula Braun { 88bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 89bd4ad577SUrsula Braun 90bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 91bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTS; 92bd4ad577SUrsula Braun qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 93bd4ad577SUrsula Braun qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 94bd4ad577SUrsula Braun qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 95bd4ad577SUrsula Braun qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 96bd4ad577SUrsula Braun qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 97bd4ad577SUrsula Braun * atomic ops allowed 98bd4ad577SUrsula Braun */ 99bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 100bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 101bd4ad577SUrsula Braun IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 102bd4ad577SUrsula Braun IB_QP_MAX_QP_RD_ATOMIC); 103bd4ad577SUrsula Braun } 104bd4ad577SUrsula Braun 105bd4ad577SUrsula Braun int smc_ib_modify_qp_reset(struct smc_link *lnk) 106bd4ad577SUrsula Braun { 107bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 108bd4ad577SUrsula Braun 109bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 110bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RESET; 111bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 112bd4ad577SUrsula Braun } 113bd4ad577SUrsula Braun 114bd4ad577SUrsula Braun int smc_ib_ready_link(struct smc_link *lnk) 115bd4ad577SUrsula Braun { 11600e5fb26SStefan Raspl struct smc_link_group *lgr = smc_get_lgr(lnk); 117bd4ad577SUrsula Braun int rc = 0; 118bd4ad577SUrsula Braun 119bd4ad577SUrsula Braun rc = smc_ib_modify_qp_init(lnk); 120bd4ad577SUrsula Braun if (rc) 121bd4ad577SUrsula Braun goto out; 122bd4ad577SUrsula Braun 123bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rtr(lnk); 124bd4ad577SUrsula Braun if (rc) 125bd4ad577SUrsula Braun goto out; 126bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 127bd4ad577SUrsula Braun rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 128bd4ad577SUrsula Braun IB_CQ_SOLICITED_MASK); 129bd4ad577SUrsula Braun if (rc) 130bd4ad577SUrsula Braun goto out; 131bd4ad577SUrsula Braun rc = smc_wr_rx_post_init(lnk); 132bd4ad577SUrsula Braun if (rc) 133bd4ad577SUrsula Braun goto out; 134bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 135bd4ad577SUrsula Braun 136bd4ad577SUrsula Braun if (lgr->role == SMC_SERV) { 137bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rts(lnk); 138bd4ad577SUrsula Braun if (rc) 139bd4ad577SUrsula Braun goto out; 140bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 141bd4ad577SUrsula Braun } 142bd4ad577SUrsula Braun out: 143bd4ad577SUrsula Braun return rc; 144bd4ad577SUrsula Braun } 145bd4ad577SUrsula Braun 1467005ada6SUrsula Braun static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) 147be6a3f38SUrsula Braun { 148b4c296f9SJason Gunthorpe const struct ib_gid_attr *attr; 149b4c296f9SJason Gunthorpe int rc = 0; 150be6a3f38SUrsula Braun 151b4c296f9SJason Gunthorpe attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); 152b4c296f9SJason Gunthorpe if (IS_ERR(attr)) 153be6a3f38SUrsula Braun return -ENODEV; 154be6a3f38SUrsula Braun 155b4c296f9SJason Gunthorpe if (attr->ndev) 156b4c296f9SJason Gunthorpe memcpy(smcibdev->mac[ibport - 1], attr->ndev->dev_addr, 157b4c296f9SJason Gunthorpe ETH_ALEN); 158b4c296f9SJason Gunthorpe else 159b4c296f9SJason Gunthorpe rc = -ENODEV; 160b4c296f9SJason Gunthorpe 161b4c296f9SJason Gunthorpe rdma_put_gid_attr(attr); 162b4c296f9SJason Gunthorpe return rc; 163be6a3f38SUrsula Braun } 164be6a3f38SUrsula Braun 165be6a3f38SUrsula Braun /* Create an identifier unique for this instance of SMC-R. 166be6a3f38SUrsula Braun * The MAC-address of the first active registered IB device 167be6a3f38SUrsula Braun * plus a random 2-byte number is used to create this identifier. 168be6a3f38SUrsula Braun * This name is delivered to the peer during connection initialization. 169be6a3f38SUrsula Braun */ 170be6a3f38SUrsula Braun static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 171be6a3f38SUrsula Braun u8 ibport) 172be6a3f38SUrsula Braun { 173be6a3f38SUrsula Braun memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 174be6a3f38SUrsula Braun sizeof(smcibdev->mac[ibport - 1])); 175be6a3f38SUrsula Braun get_random_bytes(&local_systemid[0], 2); 176be6a3f38SUrsula Braun } 177be6a3f38SUrsula Braun 178be6a3f38SUrsula Braun bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 179be6a3f38SUrsula Braun { 180be6a3f38SUrsula Braun return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 181be6a3f38SUrsula Braun } 182be6a3f38SUrsula Braun 1837005ada6SUrsula Braun /* determine the gid for an ib-device port and vlan id */ 1847005ada6SUrsula Braun int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 1857005ada6SUrsula Braun unsigned short vlan_id, u8 gid[], u8 *sgid_index) 1867005ada6SUrsula Braun { 187b4c296f9SJason Gunthorpe const struct ib_gid_attr *attr; 1887005ada6SUrsula Braun int i; 1897005ada6SUrsula Braun 1907005ada6SUrsula Braun for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 191b4c296f9SJason Gunthorpe attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 192b4c296f9SJason Gunthorpe if (IS_ERR(attr)) 1937005ada6SUrsula Braun continue; 194b4c296f9SJason Gunthorpe 195b4c296f9SJason Gunthorpe if (attr->ndev && 196b4c296f9SJason Gunthorpe ((!vlan_id && !is_vlan_dev(attr->ndev)) || 197b4c296f9SJason Gunthorpe (vlan_id && is_vlan_dev(attr->ndev) && 198b4c296f9SJason Gunthorpe vlan_dev_vlan_id(attr->ndev) == vlan_id)) && 199b4c296f9SJason Gunthorpe attr->gid_type == IB_GID_TYPE_ROCE) { 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 } 207b4c296f9SJason Gunthorpe rdma_put_gid_attr(attr); 2087005ada6SUrsula Braun } 2097005ada6SUrsula Braun return -ENODEV; 2107005ada6SUrsula Braun } 2117005ada6SUrsula Braun 212be6a3f38SUrsula Braun static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 213be6a3f38SUrsula Braun { 214be6a3f38SUrsula Braun int rc; 215be6a3f38SUrsula Braun 216be6a3f38SUrsula Braun memset(&smcibdev->pattr[ibport - 1], 0, 217be6a3f38SUrsula Braun sizeof(smcibdev->pattr[ibport - 1])); 218be6a3f38SUrsula Braun rc = ib_query_port(smcibdev->ibdev, ibport, 219be6a3f38SUrsula Braun &smcibdev->pattr[ibport - 1]); 220be6a3f38SUrsula Braun if (rc) 221be6a3f38SUrsula Braun goto out; 222be6a3f38SUrsula Braun /* the SMC protocol requires specification of the RoCE MAC address */ 2237005ada6SUrsula Braun rc = smc_ib_fill_mac(smcibdev, ibport); 224be6a3f38SUrsula Braun if (rc) 225be6a3f38SUrsula Braun goto out; 226be6a3f38SUrsula Braun if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, 227be6a3f38SUrsula Braun sizeof(local_systemid)) && 228be6a3f38SUrsula Braun smc_ib_port_active(smcibdev, ibport)) 229be6a3f38SUrsula Braun /* create unique system identifier */ 230be6a3f38SUrsula Braun smc_ib_define_local_systemid(smcibdev, ibport); 231be6a3f38SUrsula Braun out: 232be6a3f38SUrsula Braun return rc; 233be6a3f38SUrsula Braun } 234be6a3f38SUrsula Braun 235bd4ad577SUrsula Braun /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 236bd4ad577SUrsula Braun static void smc_ib_port_event_work(struct work_struct *work) 237bd4ad577SUrsula Braun { 238bd4ad577SUrsula Braun struct smc_ib_device *smcibdev = container_of( 239bd4ad577SUrsula Braun work, struct smc_ib_device, port_event_work); 240bd4ad577SUrsula Braun u8 port_idx; 241bd4ad577SUrsula Braun 242bd4ad577SUrsula Braun for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 243bd4ad577SUrsula Braun smc_ib_remember_port_attr(smcibdev, port_idx + 1); 244bd4ad577SUrsula Braun clear_bit(port_idx, &smcibdev->port_event_mask); 245da05bf29SUrsula Braun if (!smc_ib_port_active(smcibdev, port_idx + 1)) 2469fda3510SHans Wippel smc_port_terminate(smcibdev, port_idx + 1); 247bd4ad577SUrsula Braun } 248bd4ad577SUrsula Braun } 249bd4ad577SUrsula Braun 250bd4ad577SUrsula Braun /* can be called in IRQ context */ 251bd4ad577SUrsula Braun static void smc_ib_global_event_handler(struct ib_event_handler *handler, 252bd4ad577SUrsula Braun struct ib_event *ibevent) 253bd4ad577SUrsula Braun { 254bd4ad577SUrsula Braun struct smc_ib_device *smcibdev; 255bd4ad577SUrsula Braun u8 port_idx; 256bd4ad577SUrsula Braun 257bd4ad577SUrsula Braun smcibdev = container_of(handler, struct smc_ib_device, event_handler); 258bd4ad577SUrsula Braun 259bd4ad577SUrsula Braun switch (ibevent->event) { 260bd4ad577SUrsula Braun case IB_EVENT_PORT_ERR: 261bd4ad577SUrsula Braun case IB_EVENT_DEVICE_FATAL: 262bd4ad577SUrsula Braun case IB_EVENT_PORT_ACTIVE: 263bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 264bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 265bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 266bd4ad577SUrsula Braun break; 267bd4ad577SUrsula Braun default: 268bd4ad577SUrsula Braun break; 269bd4ad577SUrsula Braun } 270bd4ad577SUrsula Braun } 271bd4ad577SUrsula Braun 272f38ba179SUrsula Braun void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 273f38ba179SUrsula Braun { 274da05bf29SUrsula Braun if (lnk->roce_pd) 275f38ba179SUrsula Braun ib_dealloc_pd(lnk->roce_pd); 276f38ba179SUrsula Braun lnk->roce_pd = NULL; 277f38ba179SUrsula Braun } 278f38ba179SUrsula Braun 279f38ba179SUrsula Braun int smc_ib_create_protection_domain(struct smc_link *lnk) 280f38ba179SUrsula Braun { 281f38ba179SUrsula Braun int rc; 282f38ba179SUrsula Braun 283897e1c24SUrsula Braun lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 284f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 285f38ba179SUrsula Braun if (IS_ERR(lnk->roce_pd)) 286f38ba179SUrsula Braun lnk->roce_pd = NULL; 287f38ba179SUrsula Braun return rc; 288f38ba179SUrsula Braun } 289f38ba179SUrsula Braun 290f38ba179SUrsula Braun static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 291f38ba179SUrsula Braun { 292da05bf29SUrsula Braun struct smc_ib_device *smcibdev = 293da05bf29SUrsula Braun (struct smc_ib_device *)ibevent->device; 294da05bf29SUrsula Braun u8 port_idx; 295da05bf29SUrsula Braun 296f38ba179SUrsula Braun switch (ibevent->event) { 297f38ba179SUrsula Braun case IB_EVENT_DEVICE_FATAL: 298f38ba179SUrsula Braun case IB_EVENT_GID_CHANGE: 299f38ba179SUrsula Braun case IB_EVENT_PORT_ERR: 300f38ba179SUrsula Braun case IB_EVENT_QP_ACCESS_ERR: 301da05bf29SUrsula Braun port_idx = ibevent->element.port_num - 1; 302da05bf29SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 303da05bf29SUrsula Braun schedule_work(&smcibdev->port_event_work); 304f38ba179SUrsula Braun break; 305f38ba179SUrsula Braun default: 306f38ba179SUrsula Braun break; 307f38ba179SUrsula Braun } 308f38ba179SUrsula Braun } 309f38ba179SUrsula Braun 310f38ba179SUrsula Braun void smc_ib_destroy_queue_pair(struct smc_link *lnk) 311f38ba179SUrsula Braun { 312da05bf29SUrsula Braun if (lnk->roce_qp) 313f38ba179SUrsula Braun ib_destroy_qp(lnk->roce_qp); 314f38ba179SUrsula Braun lnk->roce_qp = NULL; 315f38ba179SUrsula Braun } 316f38ba179SUrsula Braun 317f38ba179SUrsula Braun /* create a queue pair within the protection domain for a link */ 318f38ba179SUrsula Braun int smc_ib_create_queue_pair(struct smc_link *lnk) 319f38ba179SUrsula Braun { 320f38ba179SUrsula Braun struct ib_qp_init_attr qp_attr = { 321f38ba179SUrsula Braun .event_handler = smc_ib_qp_event_handler, 322f38ba179SUrsula Braun .qp_context = lnk, 323f38ba179SUrsula Braun .send_cq = lnk->smcibdev->roce_cq_send, 324f38ba179SUrsula Braun .recv_cq = lnk->smcibdev->roce_cq_recv, 325f38ba179SUrsula Braun .srq = NULL, 326f38ba179SUrsula Braun .cap = { 327f38ba179SUrsula Braun /* include unsolicited rdma_writes as well, 328f38ba179SUrsula Braun * there are max. 2 RDMA_WRITE per 1 WR_SEND 329f38ba179SUrsula Braun */ 330652a1e41SUrsula Braun .max_send_wr = SMC_WR_BUF_CNT * 3, 331f38ba179SUrsula Braun .max_recv_wr = SMC_WR_BUF_CNT * 3, 332f38ba179SUrsula Braun .max_send_sge = SMC_IB_MAX_SEND_SGE, 333f38ba179SUrsula Braun .max_recv_sge = 1, 334f38ba179SUrsula Braun }, 335f38ba179SUrsula Braun .sq_sig_type = IB_SIGNAL_REQ_WR, 336f38ba179SUrsula Braun .qp_type = IB_QPT_RC, 337f38ba179SUrsula Braun }; 338f38ba179SUrsula Braun int rc; 339f38ba179SUrsula Braun 340f38ba179SUrsula Braun lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 341f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 342f38ba179SUrsula Braun if (IS_ERR(lnk->roce_qp)) 343f38ba179SUrsula Braun lnk->roce_qp = NULL; 344f38ba179SUrsula Braun else 345f38ba179SUrsula Braun smc_wr_remember_qp_attr(lnk); 346f38ba179SUrsula Braun return rc; 347f38ba179SUrsula Braun } 348f38ba179SUrsula Braun 349897e1c24SUrsula Braun void smc_ib_put_memory_region(struct ib_mr *mr) 350897e1c24SUrsula Braun { 351897e1c24SUrsula Braun ib_dereg_mr(mr); 352897e1c24SUrsula Braun } 353897e1c24SUrsula Braun 354897e1c24SUrsula Braun static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 355897e1c24SUrsula Braun { 356897e1c24SUrsula Braun unsigned int offset = 0; 357897e1c24SUrsula Braun int sg_num; 358897e1c24SUrsula Braun 359897e1c24SUrsula Braun /* map the largest prefix of a dma mapped SG list */ 360897e1c24SUrsula Braun sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 361897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 362897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 363897e1c24SUrsula Braun &offset, PAGE_SIZE); 364897e1c24SUrsula Braun 365897e1c24SUrsula Braun return sg_num; 366897e1c24SUrsula Braun } 367897e1c24SUrsula Braun 368897e1c24SUrsula Braun /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 369897e1c24SUrsula Braun int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 370897e1c24SUrsula Braun struct smc_buf_desc *buf_slot) 371897e1c24SUrsula Braun { 372897e1c24SUrsula Braun if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 373897e1c24SUrsula Braun return 0; /* already done */ 374897e1c24SUrsula Braun 375897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = 376897e1c24SUrsula Braun ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 377897e1c24SUrsula Braun if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 378897e1c24SUrsula Braun int rc; 379897e1c24SUrsula Braun 380897e1c24SUrsula Braun rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 381897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 382897e1c24SUrsula Braun return rc; 383897e1c24SUrsula Braun } 384897e1c24SUrsula Braun 385897e1c24SUrsula Braun if (smc_ib_map_mr_sg(buf_slot) != 1) 386897e1c24SUrsula Braun return -EINVAL; 387897e1c24SUrsula Braun 388897e1c24SUrsula Braun return 0; 389897e1c24SUrsula Braun } 390897e1c24SUrsula Braun 39110428dd8SUrsula Braun /* synchronize buffer usage for cpu access */ 39210428dd8SUrsula Braun void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, 39310428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 39410428dd8SUrsula Braun enum dma_data_direction data_direction) 39510428dd8SUrsula Braun { 39610428dd8SUrsula Braun struct scatterlist *sg; 39710428dd8SUrsula Braun unsigned int i; 39810428dd8SUrsula Braun 39910428dd8SUrsula Braun /* for now there is just one DMA address */ 40010428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 40110428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 40210428dd8SUrsula Braun if (!sg_dma_len(sg)) 40310428dd8SUrsula Braun break; 40410428dd8SUrsula Braun ib_dma_sync_single_for_cpu(smcibdev->ibdev, 40510428dd8SUrsula Braun sg_dma_address(sg), 40610428dd8SUrsula Braun sg_dma_len(sg), 40710428dd8SUrsula Braun data_direction); 40810428dd8SUrsula Braun } 40910428dd8SUrsula Braun } 41010428dd8SUrsula Braun 41110428dd8SUrsula Braun /* synchronize buffer usage for device access */ 41210428dd8SUrsula Braun void smc_ib_sync_sg_for_device(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_device(smcibdev->ibdev, 42510428dd8SUrsula Braun sg_dma_address(sg), 42610428dd8SUrsula Braun sg_dma_len(sg), 42710428dd8SUrsula Braun data_direction); 42810428dd8SUrsula Braun } 42910428dd8SUrsula Braun } 43010428dd8SUrsula Braun 431a3fe3d01SUrsula Braun /* Map a new TX or RX buffer SG-table to DMA */ 432a3fe3d01SUrsula Braun int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 433a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 434a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 435a3fe3d01SUrsula Braun { 436a3fe3d01SUrsula Braun int mapped_nents; 437a3fe3d01SUrsula Braun 438a3fe3d01SUrsula Braun mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 439a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 440a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 441a3fe3d01SUrsula Braun data_direction); 442a3fe3d01SUrsula Braun if (!mapped_nents) 443a3fe3d01SUrsula Braun return -ENOMEM; 444a3fe3d01SUrsula Braun 445a3fe3d01SUrsula Braun return mapped_nents; 446a3fe3d01SUrsula Braun } 447a3fe3d01SUrsula Braun 448a3fe3d01SUrsula Braun void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 449a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 450a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 451a3fe3d01SUrsula Braun { 452a3fe3d01SUrsula Braun if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 453a3fe3d01SUrsula Braun return; /* already unmapped */ 454a3fe3d01SUrsula Braun 455a3fe3d01SUrsula Braun ib_dma_unmap_sg(smcibdev->ibdev, 456a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 457a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 458a3fe3d01SUrsula Braun data_direction); 459a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 460a3fe3d01SUrsula Braun } 461a3fe3d01SUrsula Braun 462bd4ad577SUrsula Braun long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 463bd4ad577SUrsula Braun { 464bd4ad577SUrsula Braun struct ib_cq_init_attr cqattr = { 465c9f4c6cfSUrsula Braun .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 466c9f4c6cfSUrsula Braun int cqe_size_order, smc_order; 467bd4ad577SUrsula Braun long rc; 468bd4ad577SUrsula Braun 469c9f4c6cfSUrsula Braun /* the calculated number of cq entries fits to mlx5 cq allocation */ 470c9f4c6cfSUrsula Braun cqe_size_order = cache_line_size() == 128 ? 7 : 6; 471c9f4c6cfSUrsula Braun smc_order = MAX_ORDER - cqe_size_order - 1; 472c9f4c6cfSUrsula Braun if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 473c9f4c6cfSUrsula Braun cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 474bd4ad577SUrsula Braun smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 475bd4ad577SUrsula Braun smc_wr_tx_cq_handler, NULL, 476bd4ad577SUrsula Braun smcibdev, &cqattr); 477bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 478bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_send)) { 479bd4ad577SUrsula Braun smcibdev->roce_cq_send = NULL; 480bd4ad577SUrsula Braun return rc; 481bd4ad577SUrsula Braun } 482bd4ad577SUrsula Braun smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 483bd4ad577SUrsula Braun smc_wr_rx_cq_handler, NULL, 484bd4ad577SUrsula Braun smcibdev, &cqattr); 485bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 486bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_recv)) { 487bd4ad577SUrsula Braun smcibdev->roce_cq_recv = NULL; 488bd4ad577SUrsula Braun goto err; 489bd4ad577SUrsula Braun } 490bd4ad577SUrsula Braun smc_wr_add_dev(smcibdev); 491bd4ad577SUrsula Braun smcibdev->initialized = 1; 492bd4ad577SUrsula Braun return rc; 493bd4ad577SUrsula Braun 494bd4ad577SUrsula Braun err: 495bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 496bd4ad577SUrsula Braun return rc; 497bd4ad577SUrsula Braun } 498bd4ad577SUrsula Braun 499bd4ad577SUrsula Braun static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 500bd4ad577SUrsula Braun { 501bd4ad577SUrsula Braun if (!smcibdev->initialized) 502bd4ad577SUrsula Braun return; 503da05bf29SUrsula Braun smcibdev->initialized = 0; 504bd4ad577SUrsula Braun smc_wr_remove_dev(smcibdev); 505bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_recv); 506bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 507bd4ad577SUrsula Braun } 508bd4ad577SUrsula Braun 509a4cf0443SUrsula Braun static struct ib_client smc_ib_client; 510a4cf0443SUrsula Braun 511a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 512a4cf0443SUrsula Braun static void smc_ib_add_dev(struct ib_device *ibdev) 513a4cf0443SUrsula Braun { 514a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 515be6a3f38SUrsula Braun u8 port_cnt; 516be6a3f38SUrsula Braun int i; 517a4cf0443SUrsula Braun 518a4cf0443SUrsula Braun if (ibdev->node_type != RDMA_NODE_IB_CA) 519a4cf0443SUrsula Braun return; 520a4cf0443SUrsula Braun 521a4cf0443SUrsula Braun smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 522a4cf0443SUrsula Braun if (!smcibdev) 523a4cf0443SUrsula Braun return; 524a4cf0443SUrsula Braun 525a4cf0443SUrsula Braun smcibdev->ibdev = ibdev; 526bd4ad577SUrsula Braun INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 527a4cf0443SUrsula Braun 528a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 529a4cf0443SUrsula Braun list_add_tail(&smcibdev->list, &smc_ib_devices.list); 530a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 531a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 532be6a3f38SUrsula Braun INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 533be6a3f38SUrsula Braun smc_ib_global_event_handler); 534be6a3f38SUrsula Braun ib_register_event_handler(&smcibdev->event_handler); 535be6a3f38SUrsula Braun 536be6a3f38SUrsula Braun /* trigger reading of the port attributes */ 537be6a3f38SUrsula Braun port_cnt = smcibdev->ibdev->phys_port_cnt; 538be6a3f38SUrsula Braun for (i = 0; 539be6a3f38SUrsula Braun i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 5400afff91cSUrsula Braun i++) { 541be6a3f38SUrsula Braun set_bit(i, &smcibdev->port_event_mask); 5420afff91cSUrsula Braun /* determine pnetids of the port */ 5430afff91cSUrsula Braun smc_pnetid_by_dev_port(ibdev->dev.parent, i, 5440afff91cSUrsula Braun smcibdev->pnetid[i]); 5450afff91cSUrsula Braun } 546be6a3f38SUrsula Braun schedule_work(&smcibdev->port_event_work); 547a4cf0443SUrsula Braun } 548a4cf0443SUrsula Braun 549a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 550a4cf0443SUrsula Braun static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 551a4cf0443SUrsula Braun { 552a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 553a4cf0443SUrsula Braun 554a4cf0443SUrsula Braun smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 555a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, NULL); 556a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 557a4cf0443SUrsula Braun list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 558a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 5596812baabSThomas Richter smc_pnet_remove_by_ibdev(smcibdev); 560bd4ad577SUrsula Braun smc_ib_cleanup_per_ibdev(smcibdev); 561be6a3f38SUrsula Braun ib_unregister_event_handler(&smcibdev->event_handler); 562a4cf0443SUrsula Braun kfree(smcibdev); 563a4cf0443SUrsula Braun } 564a4cf0443SUrsula Braun 565a4cf0443SUrsula Braun static struct ib_client smc_ib_client = { 566a4cf0443SUrsula Braun .name = "smc_ib", 567a4cf0443SUrsula Braun .add = smc_ib_add_dev, 568a4cf0443SUrsula Braun .remove = smc_ib_remove_dev, 569a4cf0443SUrsula Braun }; 570a4cf0443SUrsula Braun 571a4cf0443SUrsula Braun int __init smc_ib_register_client(void) 572a4cf0443SUrsula Braun { 573a4cf0443SUrsula Braun return ib_register_client(&smc_ib_client); 574a4cf0443SUrsula Braun } 575a4cf0443SUrsula Braun 576a4cf0443SUrsula Braun void smc_ib_unregister_client(void) 577a4cf0443SUrsula Braun { 578a4cf0443SUrsula Braun ib_unregister_client(&smc_ib_client); 579a4cf0443SUrsula Braun } 580