1a4cf0443SUrsula Braun /* 2a4cf0443SUrsula Braun * Shared Memory Communications over RDMA (SMC-R) and RoCE 3a4cf0443SUrsula Braun * 4a4cf0443SUrsula Braun * IB infrastructure: 5a4cf0443SUrsula Braun * Establish SMC-R as an Infiniband Client to be notified about added and 6a4cf0443SUrsula Braun * removed IB devices of type RDMA. 7a4cf0443SUrsula Braun * Determine device and port characteristics for these IB devices. 8a4cf0443SUrsula Braun * 9a4cf0443SUrsula Braun * Copyright IBM Corp. 2016 10a4cf0443SUrsula Braun * 11a4cf0443SUrsula Braun * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 12a4cf0443SUrsula Braun */ 13a4cf0443SUrsula Braun 14a4cf0443SUrsula Braun #include <linux/random.h> 15bd4ad577SUrsula Braun #include <linux/workqueue.h> 16a4cf0443SUrsula Braun #include <rdma/ib_verbs.h> 17a4cf0443SUrsula Braun 186812baabSThomas Richter #include "smc_pnet.h" 19a4cf0443SUrsula Braun #include "smc_ib.h" 20cd6851f3SUrsula Braun #include "smc_core.h" 21f38ba179SUrsula Braun #include "smc_wr.h" 22a4cf0443SUrsula Braun #include "smc.h" 23a4cf0443SUrsula Braun 24bd4ad577SUrsula Braun #define SMC_QP_MIN_RNR_TIMER 5 25bd4ad577SUrsula Braun #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 26bd4ad577SUrsula Braun #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 27bd4ad577SUrsula Braun #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 28bd4ad577SUrsula Braun 29a4cf0443SUrsula Braun struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 30a4cf0443SUrsula Braun .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 31a4cf0443SUrsula Braun .list = LIST_HEAD_INIT(smc_ib_devices.list), 32a4cf0443SUrsula Braun }; 33a4cf0443SUrsula Braun 34a4cf0443SUrsula Braun #define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" 35a4cf0443SUrsula Braun 36a4cf0443SUrsula Braun u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system 37a4cf0443SUrsula Braun * identifier 38a4cf0443SUrsula Braun */ 39a4cf0443SUrsula Braun 40bd4ad577SUrsula Braun static int smc_ib_modify_qp_init(struct smc_link *lnk) 41bd4ad577SUrsula Braun { 42bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 43bd4ad577SUrsula Braun 44bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 45bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_INIT; 46bd4ad577SUrsula Braun qp_attr.pkey_index = 0; 47bd4ad577SUrsula Braun qp_attr.port_num = lnk->ibport; 48bd4ad577SUrsula Braun qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 49bd4ad577SUrsula Braun | IB_ACCESS_REMOTE_WRITE; 50bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 51bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_PKEY_INDEX | 52bd4ad577SUrsula Braun IB_QP_ACCESS_FLAGS | IB_QP_PORT); 53bd4ad577SUrsula Braun } 54bd4ad577SUrsula Braun 55bd4ad577SUrsula Braun static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 56bd4ad577SUrsula Braun { 57bd4ad577SUrsula Braun enum ib_qp_attr_mask qp_attr_mask = 58bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 59bd4ad577SUrsula Braun IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 60bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 61bd4ad577SUrsula Braun 62bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 63bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTR; 64bd4ad577SUrsula Braun qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 6544c58487SDasaratharaman Chandramouli qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 66d8966fcdSDasaratharaman Chandramouli rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 67d8966fcdSDasaratharaman Chandramouli rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, 0, 1, 0); 68d8966fcdSDasaratharaman Chandramouli rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 6944c58487SDasaratharaman Chandramouli memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 70bd4ad577SUrsula Braun sizeof(lnk->peer_mac)); 71bd4ad577SUrsula Braun qp_attr.dest_qp_num = lnk->peer_qpn; 72bd4ad577SUrsula Braun qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 73bd4ad577SUrsula Braun qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 74bd4ad577SUrsula Braun * requests 75bd4ad577SUrsula Braun */ 76bd4ad577SUrsula Braun qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 77bd4ad577SUrsula Braun 78bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 79bd4ad577SUrsula Braun } 80bd4ad577SUrsula Braun 81bd4ad577SUrsula Braun int smc_ib_modify_qp_rts(struct smc_link *lnk) 82bd4ad577SUrsula Braun { 83bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 84bd4ad577SUrsula Braun 85bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 86bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTS; 87bd4ad577SUrsula Braun qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 88bd4ad577SUrsula Braun qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 89bd4ad577SUrsula Braun qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 90bd4ad577SUrsula Braun qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 91bd4ad577SUrsula Braun qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 92bd4ad577SUrsula Braun * atomic ops allowed 93bd4ad577SUrsula Braun */ 94bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 95bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 96bd4ad577SUrsula Braun IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 97bd4ad577SUrsula Braun IB_QP_MAX_QP_RD_ATOMIC); 98bd4ad577SUrsula Braun } 99bd4ad577SUrsula Braun 100bd4ad577SUrsula Braun int smc_ib_modify_qp_reset(struct smc_link *lnk) 101bd4ad577SUrsula Braun { 102bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 103bd4ad577SUrsula Braun 104bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 105bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RESET; 106bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 107bd4ad577SUrsula Braun } 108bd4ad577SUrsula Braun 109bd4ad577SUrsula Braun int smc_ib_ready_link(struct smc_link *lnk) 110bd4ad577SUrsula Braun { 111bd4ad577SUrsula Braun struct smc_link_group *lgr = 112bd4ad577SUrsula Braun container_of(lnk, struct smc_link_group, lnk[0]); 113bd4ad577SUrsula Braun int rc = 0; 114bd4ad577SUrsula Braun 115bd4ad577SUrsula Braun rc = smc_ib_modify_qp_init(lnk); 116bd4ad577SUrsula Braun if (rc) 117bd4ad577SUrsula Braun goto out; 118bd4ad577SUrsula Braun 119bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rtr(lnk); 120bd4ad577SUrsula Braun if (rc) 121bd4ad577SUrsula Braun goto out; 122bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 123bd4ad577SUrsula Braun rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 124bd4ad577SUrsula Braun IB_CQ_SOLICITED_MASK); 125bd4ad577SUrsula Braun if (rc) 126bd4ad577SUrsula Braun goto out; 127bd4ad577SUrsula Braun rc = smc_wr_rx_post_init(lnk); 128bd4ad577SUrsula Braun if (rc) 129bd4ad577SUrsula Braun goto out; 130bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 131bd4ad577SUrsula Braun 132bd4ad577SUrsula Braun if (lgr->role == SMC_SERV) { 133bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rts(lnk); 134bd4ad577SUrsula Braun if (rc) 135bd4ad577SUrsula Braun goto out; 136bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 137bd4ad577SUrsula Braun } 138bd4ad577SUrsula Braun out: 139bd4ad577SUrsula Braun return rc; 140bd4ad577SUrsula Braun } 141bd4ad577SUrsula Braun 142bd4ad577SUrsula Braun /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 143bd4ad577SUrsula Braun static void smc_ib_port_event_work(struct work_struct *work) 144bd4ad577SUrsula Braun { 145bd4ad577SUrsula Braun struct smc_ib_device *smcibdev = container_of( 146bd4ad577SUrsula Braun work, struct smc_ib_device, port_event_work); 147bd4ad577SUrsula Braun u8 port_idx; 148bd4ad577SUrsula Braun 149bd4ad577SUrsula Braun for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 150bd4ad577SUrsula Braun smc_ib_remember_port_attr(smcibdev, port_idx + 1); 151bd4ad577SUrsula Braun clear_bit(port_idx, &smcibdev->port_event_mask); 152bd4ad577SUrsula Braun } 153bd4ad577SUrsula Braun } 154bd4ad577SUrsula Braun 155bd4ad577SUrsula Braun /* can be called in IRQ context */ 156bd4ad577SUrsula Braun static void smc_ib_global_event_handler(struct ib_event_handler *handler, 157bd4ad577SUrsula Braun struct ib_event *ibevent) 158bd4ad577SUrsula Braun { 159bd4ad577SUrsula Braun struct smc_ib_device *smcibdev; 160bd4ad577SUrsula Braun u8 port_idx; 161bd4ad577SUrsula Braun 162bd4ad577SUrsula Braun smcibdev = container_of(handler, struct smc_ib_device, event_handler); 163bd4ad577SUrsula Braun 164bd4ad577SUrsula Braun switch (ibevent->event) { 165bd4ad577SUrsula Braun case IB_EVENT_PORT_ERR: 166bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 167bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 168bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 169bd4ad577SUrsula Braun /* fall through */ 170bd4ad577SUrsula Braun case IB_EVENT_DEVICE_FATAL: 171bd4ad577SUrsula Braun /* tbd in follow-on patch: 172bd4ad577SUrsula Braun * abnormal close of corresponding connections 173bd4ad577SUrsula Braun */ 174bd4ad577SUrsula Braun break; 175bd4ad577SUrsula Braun case IB_EVENT_PORT_ACTIVE: 176bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 177bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 178bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 179bd4ad577SUrsula Braun break; 180bd4ad577SUrsula Braun default: 181bd4ad577SUrsula Braun break; 182bd4ad577SUrsula Braun } 183bd4ad577SUrsula Braun } 184bd4ad577SUrsula Braun 185f38ba179SUrsula Braun void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 186f38ba179SUrsula Braun { 187f38ba179SUrsula Braun ib_dealloc_pd(lnk->roce_pd); 188f38ba179SUrsula Braun lnk->roce_pd = NULL; 189f38ba179SUrsula Braun } 190f38ba179SUrsula Braun 191f38ba179SUrsula Braun int smc_ib_create_protection_domain(struct smc_link *lnk) 192f38ba179SUrsula Braun { 193f38ba179SUrsula Braun int rc; 194f38ba179SUrsula Braun 195897e1c24SUrsula Braun lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 196f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 197f38ba179SUrsula Braun if (IS_ERR(lnk->roce_pd)) 198f38ba179SUrsula Braun lnk->roce_pd = NULL; 199f38ba179SUrsula Braun return rc; 200f38ba179SUrsula Braun } 201f38ba179SUrsula Braun 202f38ba179SUrsula Braun static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 203f38ba179SUrsula Braun { 204f38ba179SUrsula Braun switch (ibevent->event) { 205f38ba179SUrsula Braun case IB_EVENT_DEVICE_FATAL: 206f38ba179SUrsula Braun case IB_EVENT_GID_CHANGE: 207f38ba179SUrsula Braun case IB_EVENT_PORT_ERR: 208f38ba179SUrsula Braun case IB_EVENT_QP_ACCESS_ERR: 209f38ba179SUrsula Braun /* tbd in follow-on patch: 210f38ba179SUrsula Braun * abnormal close of corresponding connections 211f38ba179SUrsula Braun */ 212f38ba179SUrsula Braun break; 213f38ba179SUrsula Braun default: 214f38ba179SUrsula Braun break; 215f38ba179SUrsula Braun } 216f38ba179SUrsula Braun } 217f38ba179SUrsula Braun 218f38ba179SUrsula Braun void smc_ib_destroy_queue_pair(struct smc_link *lnk) 219f38ba179SUrsula Braun { 220f38ba179SUrsula Braun ib_destroy_qp(lnk->roce_qp); 221f38ba179SUrsula Braun lnk->roce_qp = NULL; 222f38ba179SUrsula Braun } 223f38ba179SUrsula Braun 224f38ba179SUrsula Braun /* create a queue pair within the protection domain for a link */ 225f38ba179SUrsula Braun int smc_ib_create_queue_pair(struct smc_link *lnk) 226f38ba179SUrsula Braun { 227f38ba179SUrsula Braun struct ib_qp_init_attr qp_attr = { 228f38ba179SUrsula Braun .event_handler = smc_ib_qp_event_handler, 229f38ba179SUrsula Braun .qp_context = lnk, 230f38ba179SUrsula Braun .send_cq = lnk->smcibdev->roce_cq_send, 231f38ba179SUrsula Braun .recv_cq = lnk->smcibdev->roce_cq_recv, 232f38ba179SUrsula Braun .srq = NULL, 233f38ba179SUrsula Braun .cap = { 234f38ba179SUrsula Braun .max_send_wr = SMC_WR_BUF_CNT, 235f38ba179SUrsula Braun /* include unsolicited rdma_writes as well, 236f38ba179SUrsula Braun * there are max. 2 RDMA_WRITE per 1 WR_SEND 237f38ba179SUrsula Braun */ 238f38ba179SUrsula Braun .max_recv_wr = SMC_WR_BUF_CNT * 3, 239f38ba179SUrsula Braun .max_send_sge = SMC_IB_MAX_SEND_SGE, 240f38ba179SUrsula Braun .max_recv_sge = 1, 241f38ba179SUrsula Braun }, 242f38ba179SUrsula Braun .sq_sig_type = IB_SIGNAL_REQ_WR, 243f38ba179SUrsula Braun .qp_type = IB_QPT_RC, 244f38ba179SUrsula Braun }; 245f38ba179SUrsula Braun int rc; 246f38ba179SUrsula Braun 247f38ba179SUrsula Braun lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 248f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 249f38ba179SUrsula Braun if (IS_ERR(lnk->roce_qp)) 250f38ba179SUrsula Braun lnk->roce_qp = NULL; 251f38ba179SUrsula Braun else 252f38ba179SUrsula Braun smc_wr_remember_qp_attr(lnk); 253f38ba179SUrsula Braun return rc; 254f38ba179SUrsula Braun } 255f38ba179SUrsula Braun 256897e1c24SUrsula Braun void smc_ib_put_memory_region(struct ib_mr *mr) 257897e1c24SUrsula Braun { 258897e1c24SUrsula Braun ib_dereg_mr(mr); 259897e1c24SUrsula Braun } 260897e1c24SUrsula Braun 261897e1c24SUrsula Braun static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 262897e1c24SUrsula Braun { 263897e1c24SUrsula Braun unsigned int offset = 0; 264897e1c24SUrsula Braun int sg_num; 265897e1c24SUrsula Braun 266897e1c24SUrsula Braun /* map the largest prefix of a dma mapped SG list */ 267897e1c24SUrsula Braun sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 268897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 269897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 270897e1c24SUrsula Braun &offset, PAGE_SIZE); 271897e1c24SUrsula Braun 272897e1c24SUrsula Braun return sg_num; 273897e1c24SUrsula Braun } 274897e1c24SUrsula Braun 275897e1c24SUrsula Braun /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 276897e1c24SUrsula Braun int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 277897e1c24SUrsula Braun struct smc_buf_desc *buf_slot) 278897e1c24SUrsula Braun { 279897e1c24SUrsula Braun if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 280897e1c24SUrsula Braun return 0; /* already done */ 281897e1c24SUrsula Braun 282897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = 283897e1c24SUrsula Braun ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 284897e1c24SUrsula Braun if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 285897e1c24SUrsula Braun int rc; 286897e1c24SUrsula Braun 287897e1c24SUrsula Braun rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 288897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 289897e1c24SUrsula Braun return rc; 290897e1c24SUrsula Braun } 291897e1c24SUrsula Braun 292897e1c24SUrsula Braun if (smc_ib_map_mr_sg(buf_slot) != 1) 293897e1c24SUrsula Braun return -EINVAL; 294897e1c24SUrsula Braun 295897e1c24SUrsula Braun return 0; 296897e1c24SUrsula Braun } 297897e1c24SUrsula Braun 298cd6851f3SUrsula Braun /* map a new TX or RX buffer to DMA */ 299cd6851f3SUrsula Braun int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size, 300cd6851f3SUrsula Braun struct smc_buf_desc *buf_slot, 301cd6851f3SUrsula Braun enum dma_data_direction data_direction) 302cd6851f3SUrsula Braun { 303cd6851f3SUrsula Braun int rc = 0; 304cd6851f3SUrsula Braun 305cd6851f3SUrsula Braun if (buf_slot->dma_addr[SMC_SINGLE_LINK]) 306cd6851f3SUrsula Braun return rc; /* already mapped */ 307cd6851f3SUrsula Braun buf_slot->dma_addr[SMC_SINGLE_LINK] = 308cd6851f3SUrsula Braun ib_dma_map_single(smcibdev->ibdev, buf_slot->cpu_addr, 309cd6851f3SUrsula Braun buf_size, data_direction); 310cd6851f3SUrsula Braun if (ib_dma_mapping_error(smcibdev->ibdev, 311cd6851f3SUrsula Braun buf_slot->dma_addr[SMC_SINGLE_LINK])) 312cd6851f3SUrsula Braun rc = -EIO; 313cd6851f3SUrsula Braun return rc; 314cd6851f3SUrsula Braun } 315cd6851f3SUrsula Braun 316bd4ad577SUrsula Braun void smc_ib_buf_unmap(struct smc_ib_device *smcibdev, int buf_size, 317bd4ad577SUrsula Braun struct smc_buf_desc *buf_slot, 318bd4ad577SUrsula Braun enum dma_data_direction data_direction) 319bd4ad577SUrsula Braun { 320bd4ad577SUrsula Braun if (!buf_slot->dma_addr[SMC_SINGLE_LINK]) 321bd4ad577SUrsula Braun return; /* already unmapped */ 322bd4ad577SUrsula Braun ib_dma_unmap_single(smcibdev->ibdev, *buf_slot->dma_addr, buf_size, 323bd4ad577SUrsula Braun data_direction); 324bd4ad577SUrsula Braun buf_slot->dma_addr[SMC_SINGLE_LINK] = 0; 325bd4ad577SUrsula Braun } 326bd4ad577SUrsula Braun 327a3fe3d01SUrsula Braun /* Map a new TX or RX buffer SG-table to DMA */ 328a3fe3d01SUrsula Braun int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 329a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 330a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 331a3fe3d01SUrsula Braun { 332a3fe3d01SUrsula Braun int mapped_nents; 333a3fe3d01SUrsula Braun 334a3fe3d01SUrsula Braun mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 335a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 336a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 337a3fe3d01SUrsula Braun data_direction); 338a3fe3d01SUrsula Braun if (!mapped_nents) 339a3fe3d01SUrsula Braun return -ENOMEM; 340a3fe3d01SUrsula Braun 341a3fe3d01SUrsula Braun return mapped_nents; 342a3fe3d01SUrsula Braun } 343a3fe3d01SUrsula Braun 344a3fe3d01SUrsula Braun void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 345a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 346a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 347a3fe3d01SUrsula Braun { 348a3fe3d01SUrsula Braun if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 349a3fe3d01SUrsula Braun return; /* already unmapped */ 350a3fe3d01SUrsula Braun 351a3fe3d01SUrsula Braun ib_dma_unmap_sg(smcibdev->ibdev, 352a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 353a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 354a3fe3d01SUrsula Braun data_direction); 355a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 356a3fe3d01SUrsula Braun } 357a3fe3d01SUrsula Braun 358a4cf0443SUrsula Braun static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) 359a4cf0443SUrsula Braun { 360a4cf0443SUrsula Braun struct net_device *ndev; 361a4cf0443SUrsula Braun int rc; 362a4cf0443SUrsula Braun 363a4cf0443SUrsula Braun rc = ib_query_gid(smcibdev->ibdev, ibport, 0, 364a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1], NULL); 365a4cf0443SUrsula Braun /* the SMC protocol requires specification of the roce MAC address; 366a4cf0443SUrsula Braun * if net_device cannot be determined, it can be derived from gid 0 367a4cf0443SUrsula Braun */ 368a4cf0443SUrsula Braun ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport); 369a4cf0443SUrsula Braun if (ndev) { 370a4cf0443SUrsula Braun memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN); 371a4cf0443SUrsula Braun } else if (!rc) { 372a4cf0443SUrsula Braun memcpy(&smcibdev->mac[ibport - 1][0], 373a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1].raw[8], 3); 374a4cf0443SUrsula Braun memcpy(&smcibdev->mac[ibport - 1][3], 375a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1].raw[13], 3); 376a4cf0443SUrsula Braun smcibdev->mac[ibport - 1][0] &= ~0x02; 377a4cf0443SUrsula Braun } 378a4cf0443SUrsula Braun return rc; 379a4cf0443SUrsula Braun } 380a4cf0443SUrsula Braun 381a4cf0443SUrsula Braun /* Create an identifier unique for this instance of SMC-R. 382a4cf0443SUrsula Braun * The MAC-address of the first active registered IB device 383a4cf0443SUrsula Braun * plus a random 2-byte number is used to create this identifier. 384a4cf0443SUrsula Braun * This name is delivered to the peer during connection initialization. 385a4cf0443SUrsula Braun */ 386a4cf0443SUrsula Braun static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 387a4cf0443SUrsula Braun u8 ibport) 388a4cf0443SUrsula Braun { 389a4cf0443SUrsula Braun memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 390a4cf0443SUrsula Braun sizeof(smcibdev->mac[ibport - 1])); 391a4cf0443SUrsula Braun get_random_bytes(&local_systemid[0], 2); 392a4cf0443SUrsula Braun } 393a4cf0443SUrsula Braun 394a4cf0443SUrsula Braun bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 395a4cf0443SUrsula Braun { 396a4cf0443SUrsula Braun return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 397a4cf0443SUrsula Braun } 398a4cf0443SUrsula Braun 399a4cf0443SUrsula Braun int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 400a4cf0443SUrsula Braun { 401a4cf0443SUrsula Braun int rc; 402a4cf0443SUrsula Braun 403a4cf0443SUrsula Braun memset(&smcibdev->pattr[ibport - 1], 0, 404a4cf0443SUrsula Braun sizeof(smcibdev->pattr[ibport - 1])); 405a4cf0443SUrsula Braun rc = ib_query_port(smcibdev->ibdev, ibport, 406a4cf0443SUrsula Braun &smcibdev->pattr[ibport - 1]); 407a4cf0443SUrsula Braun if (rc) 408a4cf0443SUrsula Braun goto out; 409a4cf0443SUrsula Braun rc = smc_ib_fill_gid_and_mac(smcibdev, ibport); 410a4cf0443SUrsula Braun if (rc) 411a4cf0443SUrsula Braun goto out; 412a4cf0443SUrsula Braun if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, 413a4cf0443SUrsula Braun sizeof(local_systemid)) && 414a4cf0443SUrsula Braun smc_ib_port_active(smcibdev, ibport)) 415a4cf0443SUrsula Braun /* create unique system identifier */ 416a4cf0443SUrsula Braun smc_ib_define_local_systemid(smcibdev, ibport); 417a4cf0443SUrsula Braun out: 418a4cf0443SUrsula Braun return rc; 419a4cf0443SUrsula Braun } 420a4cf0443SUrsula Braun 421bd4ad577SUrsula Braun long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 422bd4ad577SUrsula Braun { 423bd4ad577SUrsula Braun struct ib_cq_init_attr cqattr = { 424bd4ad577SUrsula Braun .cqe = SMC_WR_MAX_CQE, .comp_vector = 0 }; 425bd4ad577SUrsula Braun long rc; 426bd4ad577SUrsula Braun 427bd4ad577SUrsula Braun smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 428bd4ad577SUrsula Braun smc_wr_tx_cq_handler, NULL, 429bd4ad577SUrsula Braun smcibdev, &cqattr); 430bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 431bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_send)) { 432bd4ad577SUrsula Braun smcibdev->roce_cq_send = NULL; 433bd4ad577SUrsula Braun return rc; 434bd4ad577SUrsula Braun } 435bd4ad577SUrsula Braun smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 436bd4ad577SUrsula Braun smc_wr_rx_cq_handler, NULL, 437bd4ad577SUrsula Braun smcibdev, &cqattr); 438bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 439bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_recv)) { 440bd4ad577SUrsula Braun smcibdev->roce_cq_recv = NULL; 441bd4ad577SUrsula Braun goto err; 442bd4ad577SUrsula Braun } 443bd4ad577SUrsula Braun INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 444bd4ad577SUrsula Braun smc_ib_global_event_handler); 445bd4ad577SUrsula Braun ib_register_event_handler(&smcibdev->event_handler); 446bd4ad577SUrsula Braun smc_wr_add_dev(smcibdev); 447bd4ad577SUrsula Braun smcibdev->initialized = 1; 448bd4ad577SUrsula Braun return rc; 449bd4ad577SUrsula Braun 450bd4ad577SUrsula Braun err: 451bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 452bd4ad577SUrsula Braun return rc; 453bd4ad577SUrsula Braun } 454bd4ad577SUrsula Braun 455bd4ad577SUrsula Braun static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 456bd4ad577SUrsula Braun { 457bd4ad577SUrsula Braun if (!smcibdev->initialized) 458bd4ad577SUrsula Braun return; 459bd4ad577SUrsula Braun smc_wr_remove_dev(smcibdev); 460bd4ad577SUrsula Braun ib_unregister_event_handler(&smcibdev->event_handler); 461bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_recv); 462bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 463bd4ad577SUrsula Braun } 464bd4ad577SUrsula Braun 465a4cf0443SUrsula Braun static struct ib_client smc_ib_client; 466a4cf0443SUrsula Braun 467a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 468a4cf0443SUrsula Braun static void smc_ib_add_dev(struct ib_device *ibdev) 469a4cf0443SUrsula Braun { 470a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 471a4cf0443SUrsula Braun 472a4cf0443SUrsula Braun if (ibdev->node_type != RDMA_NODE_IB_CA) 473a4cf0443SUrsula Braun return; 474a4cf0443SUrsula Braun 475a4cf0443SUrsula Braun smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 476a4cf0443SUrsula Braun if (!smcibdev) 477a4cf0443SUrsula Braun return; 478a4cf0443SUrsula Braun 479a4cf0443SUrsula Braun smcibdev->ibdev = ibdev; 480bd4ad577SUrsula Braun INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 481a4cf0443SUrsula Braun 482a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 483a4cf0443SUrsula Braun list_add_tail(&smcibdev->list, &smc_ib_devices.list); 484a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 485a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 486a4cf0443SUrsula Braun } 487a4cf0443SUrsula Braun 488a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 489a4cf0443SUrsula Braun static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 490a4cf0443SUrsula Braun { 491a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 492a4cf0443SUrsula Braun 493a4cf0443SUrsula Braun smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 494a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, NULL); 495a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 496a4cf0443SUrsula Braun list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 497a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 4986812baabSThomas Richter smc_pnet_remove_by_ibdev(smcibdev); 499bd4ad577SUrsula Braun smc_ib_cleanup_per_ibdev(smcibdev); 500a4cf0443SUrsula Braun kfree(smcibdev); 501a4cf0443SUrsula Braun } 502a4cf0443SUrsula Braun 503a4cf0443SUrsula Braun static struct ib_client smc_ib_client = { 504a4cf0443SUrsula Braun .name = "smc_ib", 505a4cf0443SUrsula Braun .add = smc_ib_add_dev, 506a4cf0443SUrsula Braun .remove = smc_ib_remove_dev, 507a4cf0443SUrsula Braun }; 508a4cf0443SUrsula Braun 509a4cf0443SUrsula Braun int __init smc_ib_register_client(void) 510a4cf0443SUrsula Braun { 511a4cf0443SUrsula Braun return ib_register_client(&smc_ib_client); 512a4cf0443SUrsula Braun } 513a4cf0443SUrsula Braun 514a4cf0443SUrsula Braun void smc_ib_unregister_client(void) 515a4cf0443SUrsula Braun { 516a4cf0443SUrsula Braun ib_unregister_client(&smc_ib_client); 517a4cf0443SUrsula Braun } 518