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> 1610428dd8SUrsula Braun #include <linux/scatterlist.h> 17a4cf0443SUrsula Braun #include <rdma/ib_verbs.h> 18a4cf0443SUrsula Braun 196812baabSThomas Richter #include "smc_pnet.h" 20a4cf0443SUrsula Braun #include "smc_ib.h" 21cd6851f3SUrsula Braun #include "smc_core.h" 22f38ba179SUrsula Braun #include "smc_wr.h" 23a4cf0443SUrsula Braun #include "smc.h" 24a4cf0443SUrsula Braun 25bd4ad577SUrsula Braun #define SMC_QP_MIN_RNR_TIMER 5 26bd4ad577SUrsula Braun #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 27bd4ad577SUrsula Braun #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 28bd4ad577SUrsula Braun #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 29bd4ad577SUrsula Braun 30a4cf0443SUrsula Braun struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 31a4cf0443SUrsula Braun .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 32a4cf0443SUrsula Braun .list = LIST_HEAD_INIT(smc_ib_devices.list), 33a4cf0443SUrsula Braun }; 34a4cf0443SUrsula Braun 35a4cf0443SUrsula Braun #define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" 36a4cf0443SUrsula Braun 37a4cf0443SUrsula Braun u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system 38a4cf0443SUrsula Braun * identifier 39a4cf0443SUrsula Braun */ 40a4cf0443SUrsula Braun 41bd4ad577SUrsula Braun static int smc_ib_modify_qp_init(struct smc_link *lnk) 42bd4ad577SUrsula Braun { 43bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 44bd4ad577SUrsula Braun 45bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 46bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_INIT; 47bd4ad577SUrsula Braun qp_attr.pkey_index = 0; 48bd4ad577SUrsula Braun qp_attr.port_num = lnk->ibport; 49bd4ad577SUrsula Braun qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 50bd4ad577SUrsula Braun | IB_ACCESS_REMOTE_WRITE; 51bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 52bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_PKEY_INDEX | 53bd4ad577SUrsula Braun IB_QP_ACCESS_FLAGS | IB_QP_PORT); 54bd4ad577SUrsula Braun } 55bd4ad577SUrsula Braun 56bd4ad577SUrsula Braun static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 57bd4ad577SUrsula Braun { 58bd4ad577SUrsula Braun enum ib_qp_attr_mask qp_attr_mask = 59bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 60bd4ad577SUrsula Braun IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 61bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 62bd4ad577SUrsula Braun 63bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 64bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTR; 65bd4ad577SUrsula Braun qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 6644c58487SDasaratharaman Chandramouli qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 67d8966fcdSDasaratharaman Chandramouli rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 68d8966fcdSDasaratharaman Chandramouli rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, 0, 1, 0); 69d8966fcdSDasaratharaman Chandramouli rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 7044c58487SDasaratharaman Chandramouli memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 71bd4ad577SUrsula Braun sizeof(lnk->peer_mac)); 72bd4ad577SUrsula Braun qp_attr.dest_qp_num = lnk->peer_qpn; 73bd4ad577SUrsula Braun qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 74bd4ad577SUrsula Braun qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 75bd4ad577SUrsula Braun * requests 76bd4ad577SUrsula Braun */ 77bd4ad577SUrsula Braun qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 78bd4ad577SUrsula Braun 79bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 80bd4ad577SUrsula Braun } 81bd4ad577SUrsula Braun 82bd4ad577SUrsula Braun int smc_ib_modify_qp_rts(struct smc_link *lnk) 83bd4ad577SUrsula Braun { 84bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 85bd4ad577SUrsula Braun 86bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 87bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTS; 88bd4ad577SUrsula Braun qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 89bd4ad577SUrsula Braun qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 90bd4ad577SUrsula Braun qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 91bd4ad577SUrsula Braun qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 92bd4ad577SUrsula Braun qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 93bd4ad577SUrsula Braun * atomic ops allowed 94bd4ad577SUrsula Braun */ 95bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 96bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 97bd4ad577SUrsula Braun IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 98bd4ad577SUrsula Braun IB_QP_MAX_QP_RD_ATOMIC); 99bd4ad577SUrsula Braun } 100bd4ad577SUrsula Braun 101bd4ad577SUrsula Braun int smc_ib_modify_qp_reset(struct smc_link *lnk) 102bd4ad577SUrsula Braun { 103bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 104bd4ad577SUrsula Braun 105bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 106bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RESET; 107bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 108bd4ad577SUrsula Braun } 109bd4ad577SUrsula Braun 110bd4ad577SUrsula Braun int smc_ib_ready_link(struct smc_link *lnk) 111bd4ad577SUrsula Braun { 112bd4ad577SUrsula Braun struct smc_link_group *lgr = 113bd4ad577SUrsula Braun container_of(lnk, struct smc_link_group, lnk[0]); 114bd4ad577SUrsula Braun int rc = 0; 115bd4ad577SUrsula Braun 116bd4ad577SUrsula Braun rc = smc_ib_modify_qp_init(lnk); 117bd4ad577SUrsula Braun if (rc) 118bd4ad577SUrsula Braun goto out; 119bd4ad577SUrsula Braun 120bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rtr(lnk); 121bd4ad577SUrsula Braun if (rc) 122bd4ad577SUrsula Braun goto out; 123bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 124bd4ad577SUrsula Braun rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 125bd4ad577SUrsula Braun IB_CQ_SOLICITED_MASK); 126bd4ad577SUrsula Braun if (rc) 127bd4ad577SUrsula Braun goto out; 128bd4ad577SUrsula Braun rc = smc_wr_rx_post_init(lnk); 129bd4ad577SUrsula Braun if (rc) 130bd4ad577SUrsula Braun goto out; 131bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 132bd4ad577SUrsula Braun 133bd4ad577SUrsula Braun if (lgr->role == SMC_SERV) { 134bd4ad577SUrsula Braun rc = smc_ib_modify_qp_rts(lnk); 135bd4ad577SUrsula Braun if (rc) 136bd4ad577SUrsula Braun goto out; 137bd4ad577SUrsula Braun smc_wr_remember_qp_attr(lnk); 138bd4ad577SUrsula Braun } 139bd4ad577SUrsula Braun out: 140bd4ad577SUrsula Braun return rc; 141bd4ad577SUrsula Braun } 142bd4ad577SUrsula Braun 143bd4ad577SUrsula Braun /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 144bd4ad577SUrsula Braun static void smc_ib_port_event_work(struct work_struct *work) 145bd4ad577SUrsula Braun { 146bd4ad577SUrsula Braun struct smc_ib_device *smcibdev = container_of( 147bd4ad577SUrsula Braun work, struct smc_ib_device, port_event_work); 148bd4ad577SUrsula Braun u8 port_idx; 149bd4ad577SUrsula Braun 150bd4ad577SUrsula Braun for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 151bd4ad577SUrsula Braun smc_ib_remember_port_attr(smcibdev, port_idx + 1); 152bd4ad577SUrsula Braun clear_bit(port_idx, &smcibdev->port_event_mask); 153bd4ad577SUrsula Braun } 154bd4ad577SUrsula Braun } 155bd4ad577SUrsula Braun 156bd4ad577SUrsula Braun /* can be called in IRQ context */ 157bd4ad577SUrsula Braun static void smc_ib_global_event_handler(struct ib_event_handler *handler, 158bd4ad577SUrsula Braun struct ib_event *ibevent) 159bd4ad577SUrsula Braun { 160bd4ad577SUrsula Braun struct smc_ib_device *smcibdev; 161bd4ad577SUrsula Braun u8 port_idx; 162bd4ad577SUrsula Braun 163bd4ad577SUrsula Braun smcibdev = container_of(handler, struct smc_ib_device, event_handler); 164bd4ad577SUrsula Braun 165bd4ad577SUrsula Braun switch (ibevent->event) { 166bd4ad577SUrsula Braun case IB_EVENT_PORT_ERR: 167bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 168bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 169bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 170bd4ad577SUrsula Braun /* fall through */ 171bd4ad577SUrsula Braun case IB_EVENT_DEVICE_FATAL: 172bd4ad577SUrsula Braun /* tbd in follow-on patch: 173bd4ad577SUrsula Braun * abnormal close of corresponding connections 174bd4ad577SUrsula Braun */ 175bd4ad577SUrsula Braun break; 176bd4ad577SUrsula Braun case IB_EVENT_PORT_ACTIVE: 177bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 178bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 179bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 180bd4ad577SUrsula Braun break; 181bd4ad577SUrsula Braun default: 182bd4ad577SUrsula Braun break; 183bd4ad577SUrsula Braun } 184bd4ad577SUrsula Braun } 185bd4ad577SUrsula Braun 186f38ba179SUrsula Braun void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 187f38ba179SUrsula Braun { 188f38ba179SUrsula Braun ib_dealloc_pd(lnk->roce_pd); 189f38ba179SUrsula Braun lnk->roce_pd = NULL; 190f38ba179SUrsula Braun } 191f38ba179SUrsula Braun 192f38ba179SUrsula Braun int smc_ib_create_protection_domain(struct smc_link *lnk) 193f38ba179SUrsula Braun { 194f38ba179SUrsula Braun int rc; 195f38ba179SUrsula Braun 196897e1c24SUrsula Braun lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 197f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 198f38ba179SUrsula Braun if (IS_ERR(lnk->roce_pd)) 199f38ba179SUrsula Braun lnk->roce_pd = NULL; 200f38ba179SUrsula Braun return rc; 201f38ba179SUrsula Braun } 202f38ba179SUrsula Braun 203f38ba179SUrsula Braun static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 204f38ba179SUrsula Braun { 205f38ba179SUrsula Braun switch (ibevent->event) { 206f38ba179SUrsula Braun case IB_EVENT_DEVICE_FATAL: 207f38ba179SUrsula Braun case IB_EVENT_GID_CHANGE: 208f38ba179SUrsula Braun case IB_EVENT_PORT_ERR: 209f38ba179SUrsula Braun case IB_EVENT_QP_ACCESS_ERR: 210f38ba179SUrsula Braun /* tbd in follow-on patch: 211f38ba179SUrsula Braun * abnormal close of corresponding connections 212f38ba179SUrsula Braun */ 213f38ba179SUrsula Braun break; 214f38ba179SUrsula Braun default: 215f38ba179SUrsula Braun break; 216f38ba179SUrsula Braun } 217f38ba179SUrsula Braun } 218f38ba179SUrsula Braun 219f38ba179SUrsula Braun void smc_ib_destroy_queue_pair(struct smc_link *lnk) 220f38ba179SUrsula Braun { 221f38ba179SUrsula Braun ib_destroy_qp(lnk->roce_qp); 222f38ba179SUrsula Braun lnk->roce_qp = NULL; 223f38ba179SUrsula Braun } 224f38ba179SUrsula Braun 225f38ba179SUrsula Braun /* create a queue pair within the protection domain for a link */ 226f38ba179SUrsula Braun int smc_ib_create_queue_pair(struct smc_link *lnk) 227f38ba179SUrsula Braun { 228f38ba179SUrsula Braun struct ib_qp_init_attr qp_attr = { 229f38ba179SUrsula Braun .event_handler = smc_ib_qp_event_handler, 230f38ba179SUrsula Braun .qp_context = lnk, 231f38ba179SUrsula Braun .send_cq = lnk->smcibdev->roce_cq_send, 232f38ba179SUrsula Braun .recv_cq = lnk->smcibdev->roce_cq_recv, 233f38ba179SUrsula Braun .srq = NULL, 234f38ba179SUrsula Braun .cap = { 235f38ba179SUrsula Braun /* include unsolicited rdma_writes as well, 236f38ba179SUrsula Braun * there are max. 2 RDMA_WRITE per 1 WR_SEND 237f38ba179SUrsula Braun */ 238652a1e41SUrsula Braun .max_send_wr = SMC_WR_BUF_CNT * 3, 239f38ba179SUrsula Braun .max_recv_wr = SMC_WR_BUF_CNT * 3, 240f38ba179SUrsula Braun .max_send_sge = SMC_IB_MAX_SEND_SGE, 241f38ba179SUrsula Braun .max_recv_sge = 1, 242f38ba179SUrsula Braun }, 243f38ba179SUrsula Braun .sq_sig_type = IB_SIGNAL_REQ_WR, 244f38ba179SUrsula Braun .qp_type = IB_QPT_RC, 245f38ba179SUrsula Braun }; 246f38ba179SUrsula Braun int rc; 247f38ba179SUrsula Braun 248f38ba179SUrsula Braun lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 249f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 250f38ba179SUrsula Braun if (IS_ERR(lnk->roce_qp)) 251f38ba179SUrsula Braun lnk->roce_qp = NULL; 252f38ba179SUrsula Braun else 253f38ba179SUrsula Braun smc_wr_remember_qp_attr(lnk); 254f38ba179SUrsula Braun return rc; 255f38ba179SUrsula Braun } 256f38ba179SUrsula Braun 257897e1c24SUrsula Braun void smc_ib_put_memory_region(struct ib_mr *mr) 258897e1c24SUrsula Braun { 259897e1c24SUrsula Braun ib_dereg_mr(mr); 260897e1c24SUrsula Braun } 261897e1c24SUrsula Braun 262897e1c24SUrsula Braun static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 263897e1c24SUrsula Braun { 264897e1c24SUrsula Braun unsigned int offset = 0; 265897e1c24SUrsula Braun int sg_num; 266897e1c24SUrsula Braun 267897e1c24SUrsula Braun /* map the largest prefix of a dma mapped SG list */ 268897e1c24SUrsula Braun sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 269897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 270897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 271897e1c24SUrsula Braun &offset, PAGE_SIZE); 272897e1c24SUrsula Braun 273897e1c24SUrsula Braun return sg_num; 274897e1c24SUrsula Braun } 275897e1c24SUrsula Braun 276897e1c24SUrsula Braun /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 277897e1c24SUrsula Braun int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 278897e1c24SUrsula Braun struct smc_buf_desc *buf_slot) 279897e1c24SUrsula Braun { 280897e1c24SUrsula Braun if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 281897e1c24SUrsula Braun return 0; /* already done */ 282897e1c24SUrsula Braun 283897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = 284897e1c24SUrsula Braun ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 285897e1c24SUrsula Braun if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 286897e1c24SUrsula Braun int rc; 287897e1c24SUrsula Braun 288897e1c24SUrsula Braun rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 289897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 290897e1c24SUrsula Braun return rc; 291897e1c24SUrsula Braun } 292897e1c24SUrsula Braun 293897e1c24SUrsula Braun if (smc_ib_map_mr_sg(buf_slot) != 1) 294897e1c24SUrsula Braun return -EINVAL; 295897e1c24SUrsula Braun 296897e1c24SUrsula Braun return 0; 297897e1c24SUrsula Braun } 298897e1c24SUrsula Braun 29910428dd8SUrsula Braun /* synchronize buffer usage for cpu access */ 30010428dd8SUrsula Braun void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, 30110428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 30210428dd8SUrsula Braun enum dma_data_direction data_direction) 30310428dd8SUrsula Braun { 30410428dd8SUrsula Braun struct scatterlist *sg; 30510428dd8SUrsula Braun unsigned int i; 30610428dd8SUrsula Braun 30710428dd8SUrsula Braun /* for now there is just one DMA address */ 30810428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 30910428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 31010428dd8SUrsula Braun if (!sg_dma_len(sg)) 31110428dd8SUrsula Braun break; 31210428dd8SUrsula Braun ib_dma_sync_single_for_cpu(smcibdev->ibdev, 31310428dd8SUrsula Braun sg_dma_address(sg), 31410428dd8SUrsula Braun sg_dma_len(sg), 31510428dd8SUrsula Braun data_direction); 31610428dd8SUrsula Braun } 31710428dd8SUrsula Braun } 31810428dd8SUrsula Braun 31910428dd8SUrsula Braun /* synchronize buffer usage for device access */ 32010428dd8SUrsula Braun void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, 32110428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 32210428dd8SUrsula Braun enum dma_data_direction data_direction) 32310428dd8SUrsula Braun { 32410428dd8SUrsula Braun struct scatterlist *sg; 32510428dd8SUrsula Braun unsigned int i; 32610428dd8SUrsula Braun 32710428dd8SUrsula Braun /* for now there is just one DMA address */ 32810428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 32910428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 33010428dd8SUrsula Braun if (!sg_dma_len(sg)) 33110428dd8SUrsula Braun break; 33210428dd8SUrsula Braun ib_dma_sync_single_for_device(smcibdev->ibdev, 33310428dd8SUrsula Braun sg_dma_address(sg), 33410428dd8SUrsula Braun sg_dma_len(sg), 33510428dd8SUrsula Braun data_direction); 33610428dd8SUrsula Braun } 33710428dd8SUrsula Braun } 33810428dd8SUrsula Braun 339a3fe3d01SUrsula Braun /* Map a new TX or RX buffer SG-table to DMA */ 340a3fe3d01SUrsula Braun int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 341a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 342a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 343a3fe3d01SUrsula Braun { 344a3fe3d01SUrsula Braun int mapped_nents; 345a3fe3d01SUrsula Braun 346a3fe3d01SUrsula Braun mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 347a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 348a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 349a3fe3d01SUrsula Braun data_direction); 350a3fe3d01SUrsula Braun if (!mapped_nents) 351a3fe3d01SUrsula Braun return -ENOMEM; 352a3fe3d01SUrsula Braun 353a3fe3d01SUrsula Braun return mapped_nents; 354a3fe3d01SUrsula Braun } 355a3fe3d01SUrsula Braun 356a3fe3d01SUrsula Braun void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 357a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 358a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 359a3fe3d01SUrsula Braun { 360a3fe3d01SUrsula Braun if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 361a3fe3d01SUrsula Braun return; /* already unmapped */ 362a3fe3d01SUrsula Braun 363a3fe3d01SUrsula Braun ib_dma_unmap_sg(smcibdev->ibdev, 364a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 365a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 366a3fe3d01SUrsula Braun data_direction); 367a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 368a3fe3d01SUrsula Braun } 369a3fe3d01SUrsula Braun 370a4cf0443SUrsula Braun static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) 371a4cf0443SUrsula Braun { 372a4cf0443SUrsula Braun struct net_device *ndev; 373a4cf0443SUrsula Braun int rc; 374a4cf0443SUrsula Braun 375a4cf0443SUrsula Braun rc = ib_query_gid(smcibdev->ibdev, ibport, 0, 376a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1], NULL); 377a4cf0443SUrsula Braun /* the SMC protocol requires specification of the roce MAC address; 378a4cf0443SUrsula Braun * if net_device cannot be determined, it can be derived from gid 0 379a4cf0443SUrsula Braun */ 380a4cf0443SUrsula Braun ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport); 381a4cf0443SUrsula Braun if (ndev) { 382a4cf0443SUrsula Braun memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN); 383a4cf0443SUrsula Braun } else if (!rc) { 384a4cf0443SUrsula Braun memcpy(&smcibdev->mac[ibport - 1][0], 385a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1].raw[8], 3); 386a4cf0443SUrsula Braun memcpy(&smcibdev->mac[ibport - 1][3], 387a4cf0443SUrsula Braun &smcibdev->gid[ibport - 1].raw[13], 3); 388a4cf0443SUrsula Braun smcibdev->mac[ibport - 1][0] &= ~0x02; 389a4cf0443SUrsula Braun } 390a4cf0443SUrsula Braun return rc; 391a4cf0443SUrsula Braun } 392a4cf0443SUrsula Braun 393a4cf0443SUrsula Braun /* Create an identifier unique for this instance of SMC-R. 394a4cf0443SUrsula Braun * The MAC-address of the first active registered IB device 395a4cf0443SUrsula Braun * plus a random 2-byte number is used to create this identifier. 396a4cf0443SUrsula Braun * This name is delivered to the peer during connection initialization. 397a4cf0443SUrsula Braun */ 398a4cf0443SUrsula Braun static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 399a4cf0443SUrsula Braun u8 ibport) 400a4cf0443SUrsula Braun { 401a4cf0443SUrsula Braun memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 402a4cf0443SUrsula Braun sizeof(smcibdev->mac[ibport - 1])); 403a4cf0443SUrsula Braun get_random_bytes(&local_systemid[0], 2); 404a4cf0443SUrsula Braun } 405a4cf0443SUrsula Braun 406a4cf0443SUrsula Braun bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 407a4cf0443SUrsula Braun { 408a4cf0443SUrsula Braun return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 409a4cf0443SUrsula Braun } 410a4cf0443SUrsula Braun 411a4cf0443SUrsula Braun int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 412a4cf0443SUrsula Braun { 413a4cf0443SUrsula Braun int rc; 414a4cf0443SUrsula Braun 415a4cf0443SUrsula Braun memset(&smcibdev->pattr[ibport - 1], 0, 416a4cf0443SUrsula Braun sizeof(smcibdev->pattr[ibport - 1])); 417a4cf0443SUrsula Braun rc = ib_query_port(smcibdev->ibdev, ibport, 418a4cf0443SUrsula Braun &smcibdev->pattr[ibport - 1]); 419a4cf0443SUrsula Braun if (rc) 420a4cf0443SUrsula Braun goto out; 421a4cf0443SUrsula Braun rc = smc_ib_fill_gid_and_mac(smcibdev, ibport); 422a4cf0443SUrsula Braun if (rc) 423a4cf0443SUrsula Braun goto out; 424a4cf0443SUrsula Braun if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, 425a4cf0443SUrsula Braun sizeof(local_systemid)) && 426a4cf0443SUrsula Braun smc_ib_port_active(smcibdev, ibport)) 427a4cf0443SUrsula Braun /* create unique system identifier */ 428a4cf0443SUrsula Braun smc_ib_define_local_systemid(smcibdev, ibport); 429a4cf0443SUrsula Braun out: 430a4cf0443SUrsula Braun return rc; 431a4cf0443SUrsula Braun } 432a4cf0443SUrsula Braun 433bd4ad577SUrsula Braun long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 434bd4ad577SUrsula Braun { 435bd4ad577SUrsula Braun struct ib_cq_init_attr cqattr = { 436bd4ad577SUrsula Braun .cqe = SMC_WR_MAX_CQE, .comp_vector = 0 }; 437bd4ad577SUrsula Braun long rc; 438bd4ad577SUrsula Braun 439bd4ad577SUrsula Braun smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 440bd4ad577SUrsula Braun smc_wr_tx_cq_handler, NULL, 441bd4ad577SUrsula Braun smcibdev, &cqattr); 442bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 443bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_send)) { 444bd4ad577SUrsula Braun smcibdev->roce_cq_send = NULL; 445bd4ad577SUrsula Braun return rc; 446bd4ad577SUrsula Braun } 447bd4ad577SUrsula Braun smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 448bd4ad577SUrsula Braun smc_wr_rx_cq_handler, NULL, 449bd4ad577SUrsula Braun smcibdev, &cqattr); 450bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 451bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_recv)) { 452bd4ad577SUrsula Braun smcibdev->roce_cq_recv = NULL; 453bd4ad577SUrsula Braun goto err; 454bd4ad577SUrsula Braun } 455bd4ad577SUrsula Braun INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 456bd4ad577SUrsula Braun smc_ib_global_event_handler); 457bd4ad577SUrsula Braun ib_register_event_handler(&smcibdev->event_handler); 458bd4ad577SUrsula Braun smc_wr_add_dev(smcibdev); 459bd4ad577SUrsula Braun smcibdev->initialized = 1; 460bd4ad577SUrsula Braun return rc; 461bd4ad577SUrsula Braun 462bd4ad577SUrsula Braun err: 463bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 464bd4ad577SUrsula Braun return rc; 465bd4ad577SUrsula Braun } 466bd4ad577SUrsula Braun 467bd4ad577SUrsula Braun static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 468bd4ad577SUrsula Braun { 469bd4ad577SUrsula Braun if (!smcibdev->initialized) 470bd4ad577SUrsula Braun return; 471bd4ad577SUrsula Braun smc_wr_remove_dev(smcibdev); 472bd4ad577SUrsula Braun ib_unregister_event_handler(&smcibdev->event_handler); 473bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_recv); 474bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 475bd4ad577SUrsula Braun } 476bd4ad577SUrsula Braun 477a4cf0443SUrsula Braun static struct ib_client smc_ib_client; 478a4cf0443SUrsula Braun 479a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 480a4cf0443SUrsula Braun static void smc_ib_add_dev(struct ib_device *ibdev) 481a4cf0443SUrsula Braun { 482a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 483a4cf0443SUrsula Braun 484a4cf0443SUrsula Braun if (ibdev->node_type != RDMA_NODE_IB_CA) 485a4cf0443SUrsula Braun return; 486a4cf0443SUrsula Braun 487a4cf0443SUrsula Braun smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 488a4cf0443SUrsula Braun if (!smcibdev) 489a4cf0443SUrsula Braun return; 490a4cf0443SUrsula Braun 491a4cf0443SUrsula Braun smcibdev->ibdev = ibdev; 492bd4ad577SUrsula Braun INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 493a4cf0443SUrsula Braun 494a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 495a4cf0443SUrsula Braun list_add_tail(&smcibdev->list, &smc_ib_devices.list); 496a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 497a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 498a4cf0443SUrsula Braun } 499a4cf0443SUrsula Braun 500a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 501a4cf0443SUrsula Braun static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 502a4cf0443SUrsula Braun { 503a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 504a4cf0443SUrsula Braun 505a4cf0443SUrsula Braun smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 506a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, NULL); 507a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 508a4cf0443SUrsula Braun list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 509a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 5106812baabSThomas Richter smc_pnet_remove_by_ibdev(smcibdev); 511bd4ad577SUrsula Braun smc_ib_cleanup_per_ibdev(smcibdev); 512a4cf0443SUrsula Braun kfree(smcibdev); 513a4cf0443SUrsula Braun } 514a4cf0443SUrsula Braun 515a4cf0443SUrsula Braun static struct ib_client smc_ib_client = { 516a4cf0443SUrsula Braun .name = "smc_ib", 517a4cf0443SUrsula Braun .add = smc_ib_add_dev, 518a4cf0443SUrsula Braun .remove = smc_ib_remove_dev, 519a4cf0443SUrsula Braun }; 520a4cf0443SUrsula Braun 521a4cf0443SUrsula Braun int __init smc_ib_register_client(void) 522a4cf0443SUrsula Braun { 523a4cf0443SUrsula Braun return ib_register_client(&smc_ib_client); 524a4cf0443SUrsula Braun } 525a4cf0443SUrsula Braun 526a4cf0443SUrsula Braun void smc_ib_unregister_client(void) 527a4cf0443SUrsula Braun { 528a4cf0443SUrsula Braun ib_unregister_client(&smc_ib_client); 529a4cf0443SUrsula Braun } 530