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xemu/hw/rdma/rdma_backend.c
Yuval Shaia ef6d4ccdc9 hw/rdma: Implementation of generic rdma device layers 
This layer is composed of two sub-modules, backend and resource manager.
Backend sub-module is responsible for all the interaction with IB layers
such as ibverbs and umad (external libraries).
Resource manager is a collection of functions and structures to manage
RDMA resources such as QPs, CQs and MRs.

Reviewed-by: Dotan Barak <dotanb@mellanox.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
2018-02-19 13:03:24 +02:00

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/*
* 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);
}
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