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> 19a4cf0443SUrsula Braun 206812baabSThomas Richter #include "smc_pnet.h" 21a4cf0443SUrsula Braun #include "smc_ib.h" 22cd6851f3SUrsula Braun #include "smc_core.h" 23f38ba179SUrsula Braun #include "smc_wr.h" 24a4cf0443SUrsula Braun #include "smc.h" 25a4cf0443SUrsula Braun 26c9f4c6cfSUrsula Braun #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 27c9f4c6cfSUrsula Braun 28bd4ad577SUrsula Braun #define SMC_QP_MIN_RNR_TIMER 5 29bd4ad577SUrsula Braun #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 30bd4ad577SUrsula Braun #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 31bd4ad577SUrsula Braun #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 32bd4ad577SUrsula Braun 33a4cf0443SUrsula Braun struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 34a4cf0443SUrsula Braun .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 35a4cf0443SUrsula Braun .list = LIST_HEAD_INIT(smc_ib_devices.list), 36a4cf0443SUrsula Braun }; 37a4cf0443SUrsula Braun 38a4cf0443SUrsula Braun #define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" 39a4cf0443SUrsula Braun 40a4cf0443SUrsula Braun u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system 41a4cf0443SUrsula Braun * identifier 42a4cf0443SUrsula Braun */ 43a4cf0443SUrsula Braun 44bd4ad577SUrsula Braun static int smc_ib_modify_qp_init(struct smc_link *lnk) 45bd4ad577SUrsula Braun { 46bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 47bd4ad577SUrsula Braun 48bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 49bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_INIT; 50bd4ad577SUrsula Braun qp_attr.pkey_index = 0; 51bd4ad577SUrsula Braun qp_attr.port_num = lnk->ibport; 52bd4ad577SUrsula Braun qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 53bd4ad577SUrsula Braun | IB_ACCESS_REMOTE_WRITE; 54bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 55bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_PKEY_INDEX | 56bd4ad577SUrsula Braun IB_QP_ACCESS_FLAGS | IB_QP_PORT); 57bd4ad577SUrsula Braun } 58bd4ad577SUrsula Braun 59bd4ad577SUrsula Braun static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 60bd4ad577SUrsula Braun { 61bd4ad577SUrsula Braun enum ib_qp_attr_mask qp_attr_mask = 62bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 63bd4ad577SUrsula Braun IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 64bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 65bd4ad577SUrsula Braun 66bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 67bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTR; 68bd4ad577SUrsula Braun qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 6944c58487SDasaratharaman Chandramouli qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 70d8966fcdSDasaratharaman Chandramouli rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 71d8966fcdSDasaratharaman Chandramouli rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, 0, 1, 0); 72d8966fcdSDasaratharaman Chandramouli rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 7344c58487SDasaratharaman Chandramouli memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 74bd4ad577SUrsula Braun sizeof(lnk->peer_mac)); 75bd4ad577SUrsula Braun qp_attr.dest_qp_num = lnk->peer_qpn; 76bd4ad577SUrsula Braun qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 77bd4ad577SUrsula Braun qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 78bd4ad577SUrsula Braun * requests 79bd4ad577SUrsula Braun */ 80bd4ad577SUrsula Braun qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 81bd4ad577SUrsula Braun 82bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 83bd4ad577SUrsula Braun } 84bd4ad577SUrsula Braun 85bd4ad577SUrsula Braun int smc_ib_modify_qp_rts(struct smc_link *lnk) 86bd4ad577SUrsula Braun { 87bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 88bd4ad577SUrsula Braun 89bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 90bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RTS; 91bd4ad577SUrsula Braun qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 92bd4ad577SUrsula Braun qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 93bd4ad577SUrsula Braun qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 94bd4ad577SUrsula Braun qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 95bd4ad577SUrsula Braun qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 96bd4ad577SUrsula Braun * atomic ops allowed 97bd4ad577SUrsula Braun */ 98bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, 99bd4ad577SUrsula Braun IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 100bd4ad577SUrsula Braun IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 101bd4ad577SUrsula Braun IB_QP_MAX_QP_RD_ATOMIC); 102bd4ad577SUrsula Braun } 103bd4ad577SUrsula Braun 104bd4ad577SUrsula Braun int smc_ib_modify_qp_reset(struct smc_link *lnk) 105bd4ad577SUrsula Braun { 106bd4ad577SUrsula Braun struct ib_qp_attr qp_attr; 107bd4ad577SUrsula Braun 108bd4ad577SUrsula Braun memset(&qp_attr, 0, sizeof(qp_attr)); 109bd4ad577SUrsula Braun qp_attr.qp_state = IB_QPS_RESET; 110bd4ad577SUrsula Braun return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 111bd4ad577SUrsula Braun } 112bd4ad577SUrsula Braun 113bd4ad577SUrsula Braun int smc_ib_ready_link(struct smc_link *lnk) 114bd4ad577SUrsula Braun { 115bd4ad577SUrsula Braun struct smc_link_group *lgr = 116bd4ad577SUrsula Braun container_of(lnk, struct smc_link_group, lnk[0]); 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 146be6a3f38SUrsula Braun static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) 147be6a3f38SUrsula Braun { 148be6a3f38SUrsula Braun struct ib_gid_attr gattr; 149be6a3f38SUrsula Braun int rc; 150be6a3f38SUrsula Braun 151be6a3f38SUrsula Braun rc = ib_query_gid(smcibdev->ibdev, ibport, 0, 152be6a3f38SUrsula Braun &smcibdev->gid[ibport - 1], &gattr); 153be6a3f38SUrsula Braun if (rc || !gattr.ndev) 154be6a3f38SUrsula Braun return -ENODEV; 155be6a3f38SUrsula Braun 156be6a3f38SUrsula Braun memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN); 157be6a3f38SUrsula Braun dev_put(gattr.ndev); 158be6a3f38SUrsula Braun return 0; 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 179be6a3f38SUrsula Braun static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 180be6a3f38SUrsula Braun { 181be6a3f38SUrsula Braun int rc; 182be6a3f38SUrsula Braun 183be6a3f38SUrsula Braun memset(&smcibdev->pattr[ibport - 1], 0, 184be6a3f38SUrsula Braun sizeof(smcibdev->pattr[ibport - 1])); 185be6a3f38SUrsula Braun rc = ib_query_port(smcibdev->ibdev, ibport, 186be6a3f38SUrsula Braun &smcibdev->pattr[ibport - 1]); 187be6a3f38SUrsula Braun if (rc) 188be6a3f38SUrsula Braun goto out; 189be6a3f38SUrsula Braun /* the SMC protocol requires specification of the RoCE MAC address */ 190be6a3f38SUrsula Braun rc = smc_ib_fill_gid_and_mac(smcibdev, ibport); 191be6a3f38SUrsula Braun if (rc) 192be6a3f38SUrsula Braun goto out; 193be6a3f38SUrsula Braun if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, 194be6a3f38SUrsula Braun sizeof(local_systemid)) && 195be6a3f38SUrsula Braun smc_ib_port_active(smcibdev, ibport)) 196be6a3f38SUrsula Braun /* create unique system identifier */ 197be6a3f38SUrsula Braun smc_ib_define_local_systemid(smcibdev, ibport); 198be6a3f38SUrsula Braun out: 199be6a3f38SUrsula Braun return rc; 200be6a3f38SUrsula Braun } 201be6a3f38SUrsula Braun 202bd4ad577SUrsula Braun /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 203bd4ad577SUrsula Braun static void smc_ib_port_event_work(struct work_struct *work) 204bd4ad577SUrsula Braun { 205bd4ad577SUrsula Braun struct smc_ib_device *smcibdev = container_of( 206bd4ad577SUrsula Braun work, struct smc_ib_device, port_event_work); 207bd4ad577SUrsula Braun u8 port_idx; 208bd4ad577SUrsula Braun 209bd4ad577SUrsula Braun for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 210bd4ad577SUrsula Braun smc_ib_remember_port_attr(smcibdev, port_idx + 1); 211bd4ad577SUrsula Braun clear_bit(port_idx, &smcibdev->port_event_mask); 212da05bf29SUrsula Braun if (!smc_ib_port_active(smcibdev, port_idx + 1)) 2139fda3510SHans Wippel smc_port_terminate(smcibdev, port_idx + 1); 214bd4ad577SUrsula Braun } 215bd4ad577SUrsula Braun } 216bd4ad577SUrsula Braun 217bd4ad577SUrsula Braun /* can be called in IRQ context */ 218bd4ad577SUrsula Braun static void smc_ib_global_event_handler(struct ib_event_handler *handler, 219bd4ad577SUrsula Braun struct ib_event *ibevent) 220bd4ad577SUrsula Braun { 221bd4ad577SUrsula Braun struct smc_ib_device *smcibdev; 222bd4ad577SUrsula Braun u8 port_idx; 223bd4ad577SUrsula Braun 224bd4ad577SUrsula Braun smcibdev = container_of(handler, struct smc_ib_device, event_handler); 225bd4ad577SUrsula Braun 226bd4ad577SUrsula Braun switch (ibevent->event) { 227bd4ad577SUrsula Braun case IB_EVENT_PORT_ERR: 228bd4ad577SUrsula Braun case IB_EVENT_DEVICE_FATAL: 229bd4ad577SUrsula Braun case IB_EVENT_PORT_ACTIVE: 230bd4ad577SUrsula Braun port_idx = ibevent->element.port_num - 1; 231bd4ad577SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 232bd4ad577SUrsula Braun schedule_work(&smcibdev->port_event_work); 233bd4ad577SUrsula Braun break; 234bd4ad577SUrsula Braun default: 235bd4ad577SUrsula Braun break; 236bd4ad577SUrsula Braun } 237bd4ad577SUrsula Braun } 238bd4ad577SUrsula Braun 239f38ba179SUrsula Braun void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 240f38ba179SUrsula Braun { 241da05bf29SUrsula Braun if (lnk->roce_pd) 242f38ba179SUrsula Braun ib_dealloc_pd(lnk->roce_pd); 243f38ba179SUrsula Braun lnk->roce_pd = NULL; 244f38ba179SUrsula Braun } 245f38ba179SUrsula Braun 246f38ba179SUrsula Braun int smc_ib_create_protection_domain(struct smc_link *lnk) 247f38ba179SUrsula Braun { 248f38ba179SUrsula Braun int rc; 249f38ba179SUrsula Braun 250897e1c24SUrsula Braun lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 251f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 252f38ba179SUrsula Braun if (IS_ERR(lnk->roce_pd)) 253f38ba179SUrsula Braun lnk->roce_pd = NULL; 254f38ba179SUrsula Braun return rc; 255f38ba179SUrsula Braun } 256f38ba179SUrsula Braun 257f38ba179SUrsula Braun static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 258f38ba179SUrsula Braun { 259da05bf29SUrsula Braun struct smc_ib_device *smcibdev = 260da05bf29SUrsula Braun (struct smc_ib_device *)ibevent->device; 261da05bf29SUrsula Braun u8 port_idx; 262da05bf29SUrsula Braun 263f38ba179SUrsula Braun switch (ibevent->event) { 264f38ba179SUrsula Braun case IB_EVENT_DEVICE_FATAL: 265f38ba179SUrsula Braun case IB_EVENT_GID_CHANGE: 266f38ba179SUrsula Braun case IB_EVENT_PORT_ERR: 267f38ba179SUrsula Braun case IB_EVENT_QP_ACCESS_ERR: 268da05bf29SUrsula Braun port_idx = ibevent->element.port_num - 1; 269da05bf29SUrsula Braun set_bit(port_idx, &smcibdev->port_event_mask); 270da05bf29SUrsula Braun schedule_work(&smcibdev->port_event_work); 271f38ba179SUrsula Braun break; 272f38ba179SUrsula Braun default: 273f38ba179SUrsula Braun break; 274f38ba179SUrsula Braun } 275f38ba179SUrsula Braun } 276f38ba179SUrsula Braun 277f38ba179SUrsula Braun void smc_ib_destroy_queue_pair(struct smc_link *lnk) 278f38ba179SUrsula Braun { 279da05bf29SUrsula Braun if (lnk->roce_qp) 280f38ba179SUrsula Braun ib_destroy_qp(lnk->roce_qp); 281f38ba179SUrsula Braun lnk->roce_qp = NULL; 282f38ba179SUrsula Braun } 283f38ba179SUrsula Braun 284f38ba179SUrsula Braun /* create a queue pair within the protection domain for a link */ 285f38ba179SUrsula Braun int smc_ib_create_queue_pair(struct smc_link *lnk) 286f38ba179SUrsula Braun { 287f38ba179SUrsula Braun struct ib_qp_init_attr qp_attr = { 288f38ba179SUrsula Braun .event_handler = smc_ib_qp_event_handler, 289f38ba179SUrsula Braun .qp_context = lnk, 290f38ba179SUrsula Braun .send_cq = lnk->smcibdev->roce_cq_send, 291f38ba179SUrsula Braun .recv_cq = lnk->smcibdev->roce_cq_recv, 292f38ba179SUrsula Braun .srq = NULL, 293f38ba179SUrsula Braun .cap = { 294f38ba179SUrsula Braun /* include unsolicited rdma_writes as well, 295f38ba179SUrsula Braun * there are max. 2 RDMA_WRITE per 1 WR_SEND 296f38ba179SUrsula Braun */ 297652a1e41SUrsula Braun .max_send_wr = SMC_WR_BUF_CNT * 3, 298f38ba179SUrsula Braun .max_recv_wr = SMC_WR_BUF_CNT * 3, 299f38ba179SUrsula Braun .max_send_sge = SMC_IB_MAX_SEND_SGE, 300f38ba179SUrsula Braun .max_recv_sge = 1, 301f38ba179SUrsula Braun }, 302f38ba179SUrsula Braun .sq_sig_type = IB_SIGNAL_REQ_WR, 303f38ba179SUrsula Braun .qp_type = IB_QPT_RC, 304f38ba179SUrsula Braun }; 305f38ba179SUrsula Braun int rc; 306f38ba179SUrsula Braun 307f38ba179SUrsula Braun lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 308f38ba179SUrsula Braun rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 309f38ba179SUrsula Braun if (IS_ERR(lnk->roce_qp)) 310f38ba179SUrsula Braun lnk->roce_qp = NULL; 311f38ba179SUrsula Braun else 312f38ba179SUrsula Braun smc_wr_remember_qp_attr(lnk); 313f38ba179SUrsula Braun return rc; 314f38ba179SUrsula Braun } 315f38ba179SUrsula Braun 316897e1c24SUrsula Braun void smc_ib_put_memory_region(struct ib_mr *mr) 317897e1c24SUrsula Braun { 318897e1c24SUrsula Braun ib_dereg_mr(mr); 319897e1c24SUrsula Braun } 320897e1c24SUrsula Braun 321897e1c24SUrsula Braun static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 322897e1c24SUrsula Braun { 323897e1c24SUrsula Braun unsigned int offset = 0; 324897e1c24SUrsula Braun int sg_num; 325897e1c24SUrsula Braun 326897e1c24SUrsula Braun /* map the largest prefix of a dma mapped SG list */ 327897e1c24SUrsula Braun sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 328897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 329897e1c24SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 330897e1c24SUrsula Braun &offset, PAGE_SIZE); 331897e1c24SUrsula Braun 332897e1c24SUrsula Braun return sg_num; 333897e1c24SUrsula Braun } 334897e1c24SUrsula Braun 335897e1c24SUrsula Braun /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 336897e1c24SUrsula Braun int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 337897e1c24SUrsula Braun struct smc_buf_desc *buf_slot) 338897e1c24SUrsula Braun { 339897e1c24SUrsula Braun if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 340897e1c24SUrsula Braun return 0; /* already done */ 341897e1c24SUrsula Braun 342897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = 343897e1c24SUrsula Braun ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 344897e1c24SUrsula Braun if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 345897e1c24SUrsula Braun int rc; 346897e1c24SUrsula Braun 347897e1c24SUrsula Braun rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 348897e1c24SUrsula Braun buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 349897e1c24SUrsula Braun return rc; 350897e1c24SUrsula Braun } 351897e1c24SUrsula Braun 352897e1c24SUrsula Braun if (smc_ib_map_mr_sg(buf_slot) != 1) 353897e1c24SUrsula Braun return -EINVAL; 354897e1c24SUrsula Braun 355897e1c24SUrsula Braun return 0; 356897e1c24SUrsula Braun } 357897e1c24SUrsula Braun 35810428dd8SUrsula Braun /* synchronize buffer usage for cpu access */ 35910428dd8SUrsula Braun void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, 36010428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 36110428dd8SUrsula Braun enum dma_data_direction data_direction) 36210428dd8SUrsula Braun { 36310428dd8SUrsula Braun struct scatterlist *sg; 36410428dd8SUrsula Braun unsigned int i; 36510428dd8SUrsula Braun 36610428dd8SUrsula Braun /* for now there is just one DMA address */ 36710428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 36810428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 36910428dd8SUrsula Braun if (!sg_dma_len(sg)) 37010428dd8SUrsula Braun break; 37110428dd8SUrsula Braun ib_dma_sync_single_for_cpu(smcibdev->ibdev, 37210428dd8SUrsula Braun sg_dma_address(sg), 37310428dd8SUrsula Braun sg_dma_len(sg), 37410428dd8SUrsula Braun data_direction); 37510428dd8SUrsula Braun } 37610428dd8SUrsula Braun } 37710428dd8SUrsula Braun 37810428dd8SUrsula Braun /* synchronize buffer usage for device access */ 37910428dd8SUrsula Braun void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, 38010428dd8SUrsula Braun struct smc_buf_desc *buf_slot, 38110428dd8SUrsula Braun enum dma_data_direction data_direction) 38210428dd8SUrsula Braun { 38310428dd8SUrsula Braun struct scatterlist *sg; 38410428dd8SUrsula Braun unsigned int i; 38510428dd8SUrsula Braun 38610428dd8SUrsula Braun /* for now there is just one DMA address */ 38710428dd8SUrsula Braun for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 38810428dd8SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 38910428dd8SUrsula Braun if (!sg_dma_len(sg)) 39010428dd8SUrsula Braun break; 39110428dd8SUrsula Braun ib_dma_sync_single_for_device(smcibdev->ibdev, 39210428dd8SUrsula Braun sg_dma_address(sg), 39310428dd8SUrsula Braun sg_dma_len(sg), 39410428dd8SUrsula Braun data_direction); 39510428dd8SUrsula Braun } 39610428dd8SUrsula Braun } 39710428dd8SUrsula Braun 398a3fe3d01SUrsula Braun /* Map a new TX or RX buffer SG-table to DMA */ 399a3fe3d01SUrsula Braun int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 400a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 401a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 402a3fe3d01SUrsula Braun { 403a3fe3d01SUrsula Braun int mapped_nents; 404a3fe3d01SUrsula Braun 405a3fe3d01SUrsula Braun mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 406a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 407a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 408a3fe3d01SUrsula Braun data_direction); 409a3fe3d01SUrsula Braun if (!mapped_nents) 410a3fe3d01SUrsula Braun return -ENOMEM; 411a3fe3d01SUrsula Braun 412a3fe3d01SUrsula Braun return mapped_nents; 413a3fe3d01SUrsula Braun } 414a3fe3d01SUrsula Braun 415a3fe3d01SUrsula Braun void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 416a3fe3d01SUrsula Braun struct smc_buf_desc *buf_slot, 417a3fe3d01SUrsula Braun enum dma_data_direction data_direction) 418a3fe3d01SUrsula Braun { 419a3fe3d01SUrsula Braun if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 420a3fe3d01SUrsula Braun return; /* already unmapped */ 421a3fe3d01SUrsula Braun 422a3fe3d01SUrsula Braun ib_dma_unmap_sg(smcibdev->ibdev, 423a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl, 424a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 425a3fe3d01SUrsula Braun data_direction); 426a3fe3d01SUrsula Braun buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 427a3fe3d01SUrsula Braun } 428a3fe3d01SUrsula Braun 429bd4ad577SUrsula Braun long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 430bd4ad577SUrsula Braun { 431bd4ad577SUrsula Braun struct ib_cq_init_attr cqattr = { 432c9f4c6cfSUrsula Braun .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 433c9f4c6cfSUrsula Braun int cqe_size_order, smc_order; 434bd4ad577SUrsula Braun long rc; 435bd4ad577SUrsula Braun 436c9f4c6cfSUrsula Braun /* the calculated number of cq entries fits to mlx5 cq allocation */ 437c9f4c6cfSUrsula Braun cqe_size_order = cache_line_size() == 128 ? 7 : 6; 438c9f4c6cfSUrsula Braun smc_order = MAX_ORDER - cqe_size_order - 1; 439c9f4c6cfSUrsula Braun if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 440c9f4c6cfSUrsula Braun cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 441bd4ad577SUrsula Braun smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 442bd4ad577SUrsula Braun smc_wr_tx_cq_handler, NULL, 443bd4ad577SUrsula Braun smcibdev, &cqattr); 444bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 445bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_send)) { 446bd4ad577SUrsula Braun smcibdev->roce_cq_send = NULL; 447bd4ad577SUrsula Braun return rc; 448bd4ad577SUrsula Braun } 449bd4ad577SUrsula Braun smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 450bd4ad577SUrsula Braun smc_wr_rx_cq_handler, NULL, 451bd4ad577SUrsula Braun smcibdev, &cqattr); 452bd4ad577SUrsula Braun rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 453bd4ad577SUrsula Braun if (IS_ERR(smcibdev->roce_cq_recv)) { 454bd4ad577SUrsula Braun smcibdev->roce_cq_recv = NULL; 455bd4ad577SUrsula Braun goto err; 456bd4ad577SUrsula Braun } 457bd4ad577SUrsula Braun smc_wr_add_dev(smcibdev); 458bd4ad577SUrsula Braun smcibdev->initialized = 1; 459bd4ad577SUrsula Braun return rc; 460bd4ad577SUrsula Braun 461bd4ad577SUrsula Braun err: 462bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 463bd4ad577SUrsula Braun return rc; 464bd4ad577SUrsula Braun } 465bd4ad577SUrsula Braun 466bd4ad577SUrsula Braun static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 467bd4ad577SUrsula Braun { 468bd4ad577SUrsula Braun if (!smcibdev->initialized) 469bd4ad577SUrsula Braun return; 470da05bf29SUrsula Braun smcibdev->initialized = 0; 471bd4ad577SUrsula Braun smc_wr_remove_dev(smcibdev); 472bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_recv); 473bd4ad577SUrsula Braun ib_destroy_cq(smcibdev->roce_cq_send); 474bd4ad577SUrsula Braun } 475bd4ad577SUrsula Braun 476a4cf0443SUrsula Braun static struct ib_client smc_ib_client; 477a4cf0443SUrsula Braun 478a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 479a4cf0443SUrsula Braun static void smc_ib_add_dev(struct ib_device *ibdev) 480a4cf0443SUrsula Braun { 481a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 482be6a3f38SUrsula Braun u8 port_cnt; 483be6a3f38SUrsula Braun int i; 484a4cf0443SUrsula Braun 485a4cf0443SUrsula Braun if (ibdev->node_type != RDMA_NODE_IB_CA) 486a4cf0443SUrsula Braun return; 487a4cf0443SUrsula Braun 488a4cf0443SUrsula Braun smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 489a4cf0443SUrsula Braun if (!smcibdev) 490a4cf0443SUrsula Braun return; 491a4cf0443SUrsula Braun 492a4cf0443SUrsula Braun smcibdev->ibdev = ibdev; 493bd4ad577SUrsula Braun INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 494a4cf0443SUrsula Braun 495a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 496a4cf0443SUrsula Braun list_add_tail(&smcibdev->list, &smc_ib_devices.list); 497a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 498a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 499be6a3f38SUrsula Braun INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 500be6a3f38SUrsula Braun smc_ib_global_event_handler); 501be6a3f38SUrsula Braun ib_register_event_handler(&smcibdev->event_handler); 502be6a3f38SUrsula Braun 503be6a3f38SUrsula Braun /* trigger reading of the port attributes */ 504be6a3f38SUrsula Braun port_cnt = smcibdev->ibdev->phys_port_cnt; 505be6a3f38SUrsula Braun for (i = 0; 506be6a3f38SUrsula Braun i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 5070afff91cSUrsula Braun i++) { 508be6a3f38SUrsula Braun set_bit(i, &smcibdev->port_event_mask); 5090afff91cSUrsula Braun /* determine pnetids of the port */ 5100afff91cSUrsula Braun smc_pnetid_by_dev_port(ibdev->dev.parent, i, 5110afff91cSUrsula Braun smcibdev->pnetid[i]); 5120afff91cSUrsula Braun } 513be6a3f38SUrsula Braun schedule_work(&smcibdev->port_event_work); 514a4cf0443SUrsula Braun } 515a4cf0443SUrsula Braun 516a4cf0443SUrsula Braun /* callback function for ib_register_client() */ 517a4cf0443SUrsula Braun static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 518a4cf0443SUrsula Braun { 519a4cf0443SUrsula Braun struct smc_ib_device *smcibdev; 520a4cf0443SUrsula Braun 521a4cf0443SUrsula Braun smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 522a4cf0443SUrsula Braun ib_set_client_data(ibdev, &smc_ib_client, NULL); 523a4cf0443SUrsula Braun spin_lock(&smc_ib_devices.lock); 524a4cf0443SUrsula Braun list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 525a4cf0443SUrsula Braun spin_unlock(&smc_ib_devices.lock); 5266812baabSThomas Richter smc_pnet_remove_by_ibdev(smcibdev); 527bd4ad577SUrsula Braun smc_ib_cleanup_per_ibdev(smcibdev); 528be6a3f38SUrsula Braun ib_unregister_event_handler(&smcibdev->event_handler); 529a4cf0443SUrsula Braun kfree(smcibdev); 530a4cf0443SUrsula Braun } 531a4cf0443SUrsula Braun 532a4cf0443SUrsula Braun static struct ib_client smc_ib_client = { 533a4cf0443SUrsula Braun .name = "smc_ib", 534a4cf0443SUrsula Braun .add = smc_ib_add_dev, 535a4cf0443SUrsula Braun .remove = smc_ib_remove_dev, 536a4cf0443SUrsula Braun }; 537a4cf0443SUrsula Braun 538a4cf0443SUrsula Braun int __init smc_ib_register_client(void) 539a4cf0443SUrsula Braun { 540a4cf0443SUrsula Braun return ib_register_client(&smc_ib_client); 541a4cf0443SUrsula Braun } 542a4cf0443SUrsula Braun 543a4cf0443SUrsula Braun void smc_ib_unregister_client(void) 544a4cf0443SUrsula Braun { 545a4cf0443SUrsula Braun ib_unregister_client(&smc_ib_client); 546a4cf0443SUrsula Braun } 547