diff options
Diffstat (limited to 'hw/rdma/rdma_backend.c')
| -rw-r--r-- | hw/rdma/rdma_backend.c | 818 |
1 files changed, 818 insertions, 0 deletions
diff --git a/hw/rdma/rdma_backend.c b/hw/rdma/rdma_backend.c new file mode 100644 index 0000000000..e306fba534 --- /dev/null +++ b/hw/rdma/rdma_backend.c @@ -0,0 +1,818 @@ +/* + * QEMU paravirtual RDMA - Generic RDMA backend + * + * Copyright (C) 2018 Oracle + * Copyright (C) 2018 Red Hat Inc + * + * Authors: + * Yuval Shaia <yuval.shaia@oracle.com> + * Marcel Apfelbaum <marcel@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include <qemu/osdep.h> +#include <qemu/error-report.h> +#include <qapi/error.h> + +#include <infiniband/verbs.h> + +#include "trace.h" +#include "rdma_utils.h" +#include "rdma_rm.h" +#include "rdma_backend.h" + +/* Vendor Errors */ +#define VENDOR_ERR_FAIL_BACKEND 0x201 +#define VENDOR_ERR_TOO_MANY_SGES 0x202 +#define VENDOR_ERR_NOMEM 0x203 +#define VENDOR_ERR_QP0 0x204 +#define VENDOR_ERR_NO_SGE 0x205 +#define VENDOR_ERR_MAD_SEND 0x206 +#define VENDOR_ERR_INVLKEY 0x207 +#define VENDOR_ERR_MR_SMALL 0x208 + +#define THR_NAME_LEN 16 + +typedef struct BackendCtx { + uint64_t req_id; + void *up_ctx; + bool is_tx_req; +} BackendCtx; + +static void (*comp_handler)(int status, unsigned int vendor_err, void *ctx); + +static void dummy_comp_handler(int status, unsigned int vendor_err, void *ctx) +{ + pr_err("No completion handler is registered\n"); +} + +static void poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq) +{ + int i, ne; + BackendCtx *bctx; + struct ibv_wc wc[2]; + + pr_dbg("Entering poll_cq loop on cq %p\n", ibcq); + do { + ne = ibv_poll_cq(ibcq, ARRAY_SIZE(wc), wc); + + pr_dbg("Got %d completion(s) from cq %p\n", ne, ibcq); + + for (i = 0; i < ne; i++) { + pr_dbg("wr_id=0x%lx\n", wc[i].wr_id); + pr_dbg("status=%d\n", wc[i].status); + + bctx = rdma_rm_get_cqe_ctx(rdma_dev_res, wc[i].wr_id); + if (unlikely(!bctx)) { + pr_dbg("Error: Failed to find ctx for req %ld\n", wc[i].wr_id); + continue; + } + pr_dbg("Processing %s CQE\n", bctx->is_tx_req ? "send" : "recv"); + + comp_handler(wc[i].status, wc[i].vendor_err, bctx->up_ctx); + + rdma_rm_dealloc_cqe_ctx(rdma_dev_res, wc[i].wr_id); + g_free(bctx); + } + } while (ne > 0); + + if (ne < 0) { + pr_dbg("Got error %d from ibv_poll_cq\n", ne); + } +} + +static void *comp_handler_thread(void *arg) +{ + RdmaBackendDev *backend_dev = (RdmaBackendDev *)arg; + int rc; + struct ibv_cq *ev_cq; + void *ev_ctx; + + pr_dbg("Starting\n"); + + while (backend_dev->comp_thread.run) { + pr_dbg("Waiting for completion on channel %p\n", backend_dev->channel); + rc = ibv_get_cq_event(backend_dev->channel, &ev_cq, &ev_ctx); + pr_dbg("ibv_get_cq_event=%d\n", rc); + if (unlikely(rc)) { + pr_dbg("---> ibv_get_cq_event (%d)\n", rc); + continue; + } + + rc = ibv_req_notify_cq(ev_cq, 0); + if (unlikely(rc)) { + pr_dbg("Error %d from ibv_req_notify_cq\n", rc); + } + + poll_cq(backend_dev->rdma_dev_res, ev_cq); + + ibv_ack_cq_events(ev_cq, 1); + } + + pr_dbg("Going down\n"); + + /* TODO: Post cqe for all remaining buffs that were posted */ + + return NULL; +} + +void rdma_backend_register_comp_handler(void (*handler)(int status, + unsigned int vendor_err, void *ctx)) +{ + comp_handler = handler; +} + +void rdma_backend_unregister_comp_handler(void) +{ + rdma_backend_register_comp_handler(dummy_comp_handler); +} + +int rdma_backend_query_port(RdmaBackendDev *backend_dev, + struct ibv_port_attr *port_attr) +{ + int rc; + + rc = ibv_query_port(backend_dev->context, backend_dev->port_num, port_attr); + if (rc) { + pr_dbg("Error %d from ibv_query_port\n", rc); + return -EIO; + } + + return 0; +} + +void rdma_backend_poll_cq(RdmaDeviceResources *rdma_dev_res, RdmaBackendCQ *cq) +{ + poll_cq(rdma_dev_res, cq->ibcq); +} + +static GHashTable *ah_hash; + +static struct ibv_ah *create_ah(RdmaBackendDev *backend_dev, struct ibv_pd *pd, + uint8_t sgid_idx, union ibv_gid *dgid) +{ + GBytes *ah_key = g_bytes_new(dgid, sizeof(*dgid)); + struct ibv_ah *ah = g_hash_table_lookup(ah_hash, ah_key); + + if (ah) { + trace_create_ah_cache_hit(be64_to_cpu(dgid->global.subnet_prefix), + be64_to_cpu(dgid->global.interface_id)); + g_bytes_unref(ah_key); + } else { + struct ibv_ah_attr ah_attr = { + .is_global = 1, + .port_num = backend_dev->port_num, + .grh.hop_limit = 1, + }; + + ah_attr.grh.dgid = *dgid; + ah_attr.grh.sgid_index = sgid_idx; + + ah = ibv_create_ah(pd, &ah_attr); + if (ah) { + g_hash_table_insert(ah_hash, ah_key, ah); + } else { + g_bytes_unref(ah_key); + pr_dbg("ibv_create_ah failed for gid <%lx %lx>\n", + be64_to_cpu(dgid->global.subnet_prefix), + be64_to_cpu(dgid->global.interface_id)); + } + + trace_create_ah_cache_miss(be64_to_cpu(dgid->global.subnet_prefix), + be64_to_cpu(dgid->global.interface_id)); + } + + return ah; +} + +static void destroy_ah_hash_key(gpointer data) +{ + g_bytes_unref(data); +} + +static void destroy_ah_hast_data(gpointer data) +{ + struct ibv_ah *ah = data; + + ibv_destroy_ah(ah); +} + +static void ah_cache_init(void) +{ + ah_hash = g_hash_table_new_full(g_bytes_hash, g_bytes_equal, + destroy_ah_hash_key, destroy_ah_hast_data); +} + +static int build_host_sge_array(RdmaDeviceResources *rdma_dev_res, + struct ibv_sge *dsge, struct ibv_sge *ssge, + uint8_t num_sge) +{ + RdmaRmMR *mr; + int ssge_idx; + + pr_dbg("num_sge=%d\n", num_sge); + + for (ssge_idx = 0; ssge_idx < num_sge; ssge_idx++) { + mr = rdma_rm_get_mr(rdma_dev_res, ssge[ssge_idx].lkey); + if (unlikely(!mr)) { + pr_dbg("Invalid lkey 0x%x\n", ssge[ssge_idx].lkey); + return VENDOR_ERR_INVLKEY | ssge[ssge_idx].lkey; + } + + dsge->addr = mr->user_mr.host_virt + ssge[ssge_idx].addr - + mr->user_mr.guest_start; + dsge->length = ssge[ssge_idx].length; + dsge->lkey = rdma_backend_mr_lkey(&mr->backend_mr); + + pr_dbg("ssge->addr=0x%lx\n", (uint64_t)ssge[ssge_idx].addr); + pr_dbg("dsge->addr=0x%lx\n", dsge->addr); + pr_dbg("dsge->length=%d\n", dsge->length); + pr_dbg("dsge->lkey=0x%x\n", dsge->lkey); + + dsge++; + } + + return 0; +} + +void rdma_backend_post_send(RdmaBackendDev *backend_dev, + RdmaBackendQP *qp, uint8_t qp_type, + struct ibv_sge *sge, uint32_t num_sge, + union ibv_gid *dgid, uint32_t dqpn, + uint32_t dqkey, void *ctx) +{ + BackendCtx *bctx; + struct ibv_sge new_sge[MAX_SGE]; + uint32_t bctx_id; + int rc; + struct ibv_send_wr wr = {0}, *bad_wr; + + if (!qp->ibqp) { /* This field does not get initialized for QP0 and QP1 */ + if (qp_type == IBV_QPT_SMI) { + pr_dbg("QP0 unsupported\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_QP0, ctx); + } else if (qp_type == IBV_QPT_GSI) { + pr_dbg("QP1\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_MAD_SEND, ctx); + } + pr_dbg("qp->ibqp is NULL for qp_type %d!!!\n", qp_type); + return; + } + + pr_dbg("num_sge=%d\n", num_sge); + if (!num_sge) { + pr_dbg("num_sge=0\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx); + return; + } + + bctx = g_malloc0(sizeof(*bctx)); + bctx->up_ctx = ctx; + bctx->is_tx_req = 1; + + rc = rdma_rm_alloc_cqe_ctx(backend_dev->rdma_dev_res, &bctx_id, bctx); + if (unlikely(rc)) { + pr_dbg("Failed to allocate cqe_ctx\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_NOMEM, ctx); + goto out_free_bctx; + } + + rc = build_host_sge_array(backend_dev->rdma_dev_res, new_sge, sge, num_sge); + if (rc) { + pr_dbg("Error: Failed to build host SGE array\n"); + comp_handler(IBV_WC_GENERAL_ERR, rc, ctx); + goto out_dealloc_cqe_ctx; + } + + if (qp_type == IBV_QPT_UD) { + wr.wr.ud.ah = create_ah(backend_dev, qp->ibpd, + backend_dev->backend_gid_idx, dgid); + wr.wr.ud.remote_qpn = dqpn; + wr.wr.ud.remote_qkey = dqkey; + } + + wr.num_sge = num_sge; + wr.opcode = IBV_WR_SEND; + wr.send_flags = IBV_SEND_SIGNALED; + wr.sg_list = new_sge; + wr.wr_id = bctx_id; + + rc = ibv_post_send(qp->ibqp, &wr, &bad_wr); + pr_dbg("ibv_post_send=%d\n", rc); + if (rc) { + pr_dbg("Fail (%d, %d) to post send WQE to qpn %d\n", rc, errno, + qp->ibqp->qp_num); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_FAIL_BACKEND, ctx); + goto out_dealloc_cqe_ctx; + } + + return; + +out_dealloc_cqe_ctx: + rdma_rm_dealloc_cqe_ctx(backend_dev->rdma_dev_res, bctx_id); + +out_free_bctx: + g_free(bctx); +} + +void rdma_backend_post_recv(RdmaBackendDev *backend_dev, + RdmaDeviceResources *rdma_dev_res, + RdmaBackendQP *qp, uint8_t qp_type, + struct ibv_sge *sge, uint32_t num_sge, void *ctx) +{ + BackendCtx *bctx; + struct ibv_sge new_sge[MAX_SGE]; + uint32_t bctx_id; + int rc; + struct ibv_recv_wr wr = {0}, *bad_wr; + + if (!qp->ibqp) { /* This field does not get initialized for QP0 and QP1 */ + if (qp_type == IBV_QPT_SMI) { + pr_dbg("QP0 unsupported\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_QP0, ctx); + } + if (qp_type == IBV_QPT_GSI) { + pr_dbg("QP1\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_MAD_SEND, ctx); + } + return; + } + + pr_dbg("num_sge=%d\n", num_sge); + if (!num_sge) { + pr_dbg("num_sge=0\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx); + return; + } + + bctx = g_malloc0(sizeof(*bctx)); + bctx->up_ctx = ctx; + bctx->is_tx_req = 0; + + rc = rdma_rm_alloc_cqe_ctx(rdma_dev_res, &bctx_id, bctx); + if (unlikely(rc)) { + pr_dbg("Failed to allocate cqe_ctx\n"); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_NOMEM, ctx); + goto out_free_bctx; + } + + rc = build_host_sge_array(rdma_dev_res, new_sge, sge, num_sge); + if (rc) { + pr_dbg("Error: Failed to build host SGE array\n"); + comp_handler(IBV_WC_GENERAL_ERR, rc, ctx); + goto out_dealloc_cqe_ctx; + } + + wr.num_sge = num_sge; + wr.sg_list = new_sge; + wr.wr_id = bctx_id; + rc = ibv_post_recv(qp->ibqp, &wr, &bad_wr); + pr_dbg("ibv_post_recv=%d\n", rc); + if (rc) { + pr_dbg("Fail (%d, %d) to post recv WQE to qpn %d\n", rc, errno, + qp->ibqp->qp_num); + comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_FAIL_BACKEND, ctx); + goto out_dealloc_cqe_ctx; + } + + return; + +out_dealloc_cqe_ctx: + rdma_rm_dealloc_cqe_ctx(rdma_dev_res, bctx_id); + +out_free_bctx: + g_free(bctx); +} + +int rdma_backend_create_pd(RdmaBackendDev *backend_dev, RdmaBackendPD *pd) +{ + pd->ibpd = ibv_alloc_pd(backend_dev->context); + + return pd->ibpd ? 0 : -EIO; +} + +void rdma_backend_destroy_pd(RdmaBackendPD *pd) +{ + if (pd->ibpd) { + ibv_dealloc_pd(pd->ibpd); + } +} + +int rdma_backend_create_mr(RdmaBackendMR *mr, RdmaBackendPD *pd, uint64_t addr, + size_t length, int access) +{ + pr_dbg("addr=0x%lx\n", addr); + pr_dbg("len=%ld\n", length); + mr->ibmr = ibv_reg_mr(pd->ibpd, (void *)addr, length, access); + if (mr->ibmr) { + pr_dbg("lkey=0x%x\n", mr->ibmr->lkey); + pr_dbg("rkey=0x%x\n", mr->ibmr->rkey); + mr->ibpd = pd->ibpd; + } + + return mr->ibmr ? 0 : -EIO; +} + +void rdma_backend_destroy_mr(RdmaBackendMR *mr) +{ + if (mr->ibmr) { + ibv_dereg_mr(mr->ibmr); + } +} + +int rdma_backend_create_cq(RdmaBackendDev *backend_dev, RdmaBackendCQ *cq, + int cqe) +{ + int rc; + + pr_dbg("cqe=%d\n", cqe); + + pr_dbg("dev->channel=%p\n", backend_dev->channel); + cq->ibcq = ibv_create_cq(backend_dev->context, cqe + 1, NULL, + backend_dev->channel, 0); + + if (cq->ibcq) { + rc = ibv_req_notify_cq(cq->ibcq, 0); + if (rc) { + pr_dbg("Error %d from ibv_req_notify_cq\n", rc); + } + cq->backend_dev = backend_dev; + } + + return cq->ibcq ? 0 : -EIO; +} + +void rdma_backend_destroy_cq(RdmaBackendCQ *cq) +{ + if (cq->ibcq) { + ibv_destroy_cq(cq->ibcq); + } +} + +int rdma_backend_create_qp(RdmaBackendQP *qp, uint8_t qp_type, + RdmaBackendPD *pd, RdmaBackendCQ *scq, + RdmaBackendCQ *rcq, uint32_t max_send_wr, + uint32_t max_recv_wr, uint32_t max_send_sge, + uint32_t max_recv_sge) +{ + struct ibv_qp_init_attr attr = {0}; + + qp->ibqp = 0; + pr_dbg("qp_type=%d\n", qp_type); + + switch (qp_type) { + case IBV_QPT_GSI: + pr_dbg("QP1 unsupported\n"); + return 0; + + case IBV_QPT_RC: + /* fall through */ + case IBV_QPT_UD: + /* do nothing */ + break; + + default: + pr_dbg("Unsupported QP type %d\n", qp_type); + return -EIO; + } + + attr.qp_type = qp_type; + attr.send_cq = scq->ibcq; + attr.recv_cq = rcq->ibcq; + attr.cap.max_send_wr = max_send_wr; + attr.cap.max_recv_wr = max_recv_wr; + attr.cap.max_send_sge = max_send_sge; + attr.cap.max_recv_sge = max_recv_sge; + + pr_dbg("max_send_wr=%d\n", max_send_wr); + pr_dbg("max_recv_wr=%d\n", max_recv_wr); + pr_dbg("max_send_sge=%d\n", max_send_sge); + pr_dbg("max_recv_sge=%d\n", max_recv_sge); + + qp->ibqp = ibv_create_qp(pd->ibpd, &attr); + if (likely(!qp->ibqp)) { + pr_dbg("Error from ibv_create_qp\n"); + return -EIO; + } + + qp->ibpd = pd->ibpd; + + /* TODO: Query QP to get max_inline_data and save it to be used in send */ + + pr_dbg("qpn=0x%x\n", qp->ibqp->qp_num); + + return 0; +} + +int rdma_backend_qp_state_init(RdmaBackendDev *backend_dev, RdmaBackendQP *qp, + uint8_t qp_type, uint32_t qkey) +{ + struct ibv_qp_attr attr = {0}; + int rc, attr_mask; + + pr_dbg("qpn=0x%x\n", qp->ibqp->qp_num); + pr_dbg("sport_num=%d\n", backend_dev->port_num); + + attr_mask = IBV_QP_STATE | IBV_QP_PKEY_INDEX | IBV_QP_PORT; + attr.qp_state = IBV_QPS_INIT; + attr.pkey_index = 0; + attr.port_num = backend_dev->port_num; + + switch (qp_type) { + case IBV_QPT_RC: + attr_mask |= IBV_QP_ACCESS_FLAGS; + break; + + case IBV_QPT_UD: + attr.qkey = qkey; + attr_mask |= IBV_QP_QKEY; + break; + + default: + pr_dbg("Unsupported QP type %d\n", qp_type); + return -EIO; + } + + rc = ibv_modify_qp(qp->ibqp, &attr, attr_mask); + if (rc) { + pr_dbg("Error %d from ibv_modify_qp\n", rc); + return -EIO; + } + + return 0; +} + +int rdma_backend_qp_state_rtr(RdmaBackendDev *backend_dev, RdmaBackendQP *qp, + uint8_t qp_type, union ibv_gid *dgid, + uint32_t dqpn, uint32_t rq_psn, uint32_t qkey, + bool use_qkey) +{ + struct ibv_qp_attr attr = {0}; + union ibv_gid ibv_gid = { + .global.interface_id = dgid->global.interface_id, + .global.subnet_prefix = dgid->global.subnet_prefix + }; + int rc, attr_mask; + + attr.qp_state = IBV_QPS_RTR; + attr_mask = IBV_QP_STATE; + + switch (qp_type) { + case IBV_QPT_RC: + pr_dbg("dgid=0x%lx,%lx\n", + be64_to_cpu(ibv_gid.global.subnet_prefix), + be64_to_cpu(ibv_gid.global.interface_id)); + pr_dbg("dqpn=0x%x\n", dqpn); + pr_dbg("sgid_idx=%d\n", backend_dev->backend_gid_idx); + pr_dbg("sport_num=%d\n", backend_dev->port_num); + pr_dbg("rq_psn=0x%x\n", rq_psn); + + attr.path_mtu = IBV_MTU_1024; + attr.dest_qp_num = dqpn; + attr.max_dest_rd_atomic = 1; + attr.min_rnr_timer = 12; + attr.ah_attr.port_num = backend_dev->port_num; + attr.ah_attr.is_global = 1; + attr.ah_attr.grh.hop_limit = 1; + attr.ah_attr.grh.dgid = ibv_gid; + attr.ah_attr.grh.sgid_index = backend_dev->backend_gid_idx; + attr.rq_psn = rq_psn; + + attr_mask |= IBV_QP_AV | IBV_QP_PATH_MTU | IBV_QP_DEST_QPN | + IBV_QP_RQ_PSN | IBV_QP_MAX_DEST_RD_ATOMIC | + IBV_QP_MIN_RNR_TIMER; + break; + + case IBV_QPT_UD: + if (use_qkey) { + pr_dbg("qkey=0x%x\n", qkey); + attr.qkey = qkey; + attr_mask |= IBV_QP_QKEY; + } + break; + } + + rc = ibv_modify_qp(qp->ibqp, &attr, attr_mask); + if (rc) { + pr_dbg("Error %d from ibv_modify_qp\n", rc); + return -EIO; + } + + return 0; +} + +int rdma_backend_qp_state_rts(RdmaBackendQP *qp, uint8_t qp_type, + uint32_t sq_psn, uint32_t qkey, bool use_qkey) +{ + struct ibv_qp_attr attr = {0}; + int rc, attr_mask; + + pr_dbg("qpn=0x%x\n", qp->ibqp->qp_num); + pr_dbg("sq_psn=0x%x\n", sq_psn); + + attr.qp_state = IBV_QPS_RTS; + attr.sq_psn = sq_psn; + attr_mask = IBV_QP_STATE | IBV_QP_SQ_PSN; + + switch (qp_type) { + case IBV_QPT_RC: + attr.timeout = 14; + attr.retry_cnt = 7; + attr.rnr_retry = 7; + attr.max_rd_atomic = 1; + + attr_mask |= IBV_QP_TIMEOUT | IBV_QP_RETRY_CNT | IBV_QP_RNR_RETRY | + IBV_QP_MAX_QP_RD_ATOMIC; + break; + + case IBV_QPT_UD: + if (use_qkey) { + pr_dbg("qkey=0x%x\n", qkey); + attr.qkey = qkey; + attr_mask |= IBV_QP_QKEY; + } + break; + } + + rc = ibv_modify_qp(qp->ibqp, &attr, attr_mask); + if (rc) { + pr_dbg("Error %d from ibv_modify_qp\n", rc); + return -EIO; + } + + return 0; +} + +void rdma_backend_destroy_qp(RdmaBackendQP *qp) +{ + if (qp->ibqp) { + ibv_destroy_qp(qp->ibqp); + } +} + +#define CHK_ATTR(req, dev, member, fmt) ({ \ + pr_dbg("%s="fmt","fmt"\n", #member, dev.member, req->member); \ + if (req->member > dev.member) { \ + warn_report("%s = 0x%lx is higher than host device capability 0x%lx", \ + #member, (uint64_t)req->member, (uint64_t)dev.member); \ + req->member = dev.member; \ + } \ + pr_dbg("%s="fmt"\n", #member, req->member); }) + +static int init_device_caps(RdmaBackendDev *backend_dev, + struct ibv_device_attr *dev_attr) +{ + if (ibv_query_device(backend_dev->context, &backend_dev->dev_attr)) { + return -EIO; + } + + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_mr_size, "%ld"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_qp, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_sge, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_qp_wr, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_cq, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_cqe, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_mr, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_pd, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_qp_rd_atom, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_qp_init_rd_atom, "%d"); + CHK_ATTR(dev_attr, backend_dev->dev_attr, max_ah, "%d"); + + return 0; +} + +int rdma_backend_init(RdmaBackendDev *backend_dev, + RdmaDeviceResources *rdma_dev_res, + const char *backend_device_name, uint8_t port_num, + uint8_t backend_gid_idx, struct ibv_device_attr *dev_attr, + Error **errp) +{ + int i; + int ret = 0; + int num_ibv_devices; + char thread_name[THR_NAME_LEN] = {0}; + struct ibv_device **dev_list; + struct ibv_port_attr port_attr; + + backend_dev->backend_gid_idx = backend_gid_idx; + backend_dev->port_num = port_num; + backend_dev->rdma_dev_res = rdma_dev_res; + + rdma_backend_register_comp_handler(dummy_comp_handler); + + dev_list = ibv_get_device_list(&num_ibv_devices); + if (!dev_list) { + error_setg(errp, "Failed to get IB devices list"); + return -EIO; + } + + if (num_ibv_devices == 0) { + error_setg(errp, "No IB devices were found"); + ret = -ENXIO; + goto out_free_dev_list; + } + + if (backend_device_name) { + for (i = 0; dev_list[i]; ++i) { + if (!strcmp(ibv_get_device_name(dev_list[i]), + backend_device_name)) { + break; + } + } + + backend_dev->ib_dev = dev_list[i]; + if (!backend_dev->ib_dev) { + error_setg(errp, "Failed to find IB device %s", + backend_device_name); + ret = -EIO; + goto out_free_dev_list; + } + } else { + backend_dev->ib_dev = *dev_list; + } + + pr_dbg("Using backend device %s, port %d, gid_idx %d\n", + ibv_get_device_name(backend_dev->ib_dev), + backend_dev->port_num, backend_dev->backend_gid_idx); + + backend_dev->context = ibv_open_device(backend_dev->ib_dev); + if (!backend_dev->context) { + error_setg(errp, "Failed to open IB device"); + ret = -EIO; + goto out; + } + + backend_dev->channel = ibv_create_comp_channel(backend_dev->context); + if (!backend_dev->channel) { + error_setg(errp, "Failed to create IB communication channel"); + ret = -EIO; + goto out_close_device; + } + pr_dbg("dev->backend_dev.channel=%p\n", backend_dev->channel); + + ret = ibv_query_port(backend_dev->context, backend_dev->port_num, + &port_attr); + if (ret) { + error_setg(errp, "Error %d from ibv_query_port", ret); + ret = -EIO; + goto out_destroy_comm_channel; + } + + if (backend_dev->backend_gid_idx > port_attr.gid_tbl_len) { + error_setg(errp, "Invalid backend_gid_idx, should be less than %d", + port_attr.gid_tbl_len); + goto out_destroy_comm_channel; + } + + ret = init_device_caps(backend_dev, dev_attr); + if (ret) { + error_setg(errp, "Failed to initialize device capabilities"); + ret = -EIO; + goto out_destroy_comm_channel; + } + + ret = ibv_query_gid(backend_dev->context, backend_dev->port_num, + backend_dev->backend_gid_idx, &backend_dev->gid); + if (ret) { + error_setg(errp, "Failed to query gid %d", + backend_dev->backend_gid_idx); + ret = -EIO; + goto out_destroy_comm_channel; + } + pr_dbg("subnet_prefix=0x%lx\n", + be64_to_cpu(backend_dev->gid.global.subnet_prefix)); + pr_dbg("interface_id=0x%lx\n", + be64_to_cpu(backend_dev->gid.global.interface_id)); + + snprintf(thread_name, sizeof(thread_name), "rdma_comp_%s", + ibv_get_device_name(backend_dev->ib_dev)); + backend_dev->comp_thread.run = true; + qemu_thread_create(&backend_dev->comp_thread.thread, thread_name, + comp_handler_thread, backend_dev, QEMU_THREAD_DETACHED); + + ah_cache_init(); + + goto out_free_dev_list; + +out_destroy_comm_channel: + ibv_destroy_comp_channel(backend_dev->channel); + +out_close_device: + ibv_close_device(backend_dev->context); + +out_free_dev_list: + ibv_free_device_list(dev_list); + +out: + return ret; +} + +void rdma_backend_fini(RdmaBackendDev *backend_dev) +{ + g_hash_table_destroy(ah_hash); + ibv_destroy_comp_channel(backend_dev->channel); + ibv_close_device(backend_dev->context); +} |