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nvme/rdma: re-use memory registrations if possible

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We don't need to re-register memory with the same ibv protection domain
more than once; maintain a global list of already-registered PDs and
reuse the existing registration for other queues.

Change-Id: I7ec9c35ed93083faa00cca4cb5c61104200a4c66
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/405702
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Daniel Verkamp 2018-03-28 14:12:38 -07:00 committed by Jim Harris
parent 898bbb660b
commit cdaf4fd922
1 changed files with 61 additions and 8 deletions
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69
lib/nvme/nvme_rdma.c
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@ -62,6 +62,14 @@ NVME RDMA qpair Resouce Defaults
#define NVME_RDMA_DEFAULT_TX_SGE 2
#define NVME_RDMA_DEFAULT_RX_SGE 1
/* Mapping from virtual address to ibv_mr pointer for a protection domain */
struct spdk_nvme_rdma_mr_map {
struct ibv_pd *pd;
struct spdk_mem_map *map;
uint64_t ref;
LIST_ENTRY(spdk_nvme_rdma_mr_map) link;
};
/* NVMe RDMA transport extensions for spdk_nvme_ctrlr */
struct nvme_rdma_ctrlr {
struct spdk_nvme_ctrlr ctrlr;
@ -101,8 +109,7 @@ struct nvme_rdma_qpair {
/* Memory region describing all cmds for this qpair */
struct ibv_mr *cmd_mr;
/* Mapping from virtual address to ibv_mr pointer */
struct spdk_mem_map *mr_map;
struct spdk_nvme_rdma_mr_map *mr_map;
STAILQ_HEAD(, spdk_nvme_rdma_req) free_reqs;
};
@ -138,6 +145,9 @@ static const char *rdma_cm_event_str[] = {
"RDMA_CM_EVENT_TIMEWAIT_EXIT"
};
static LIST_HEAD(, spdk_nvme_rdma_mr_map) g_rdma_mr_maps = LIST_HEAD_INITIALIZER(&g_rdma_mr_maps);
static pthread_mutex_t g_rdma_mr_maps_mutex = PTHREAD_MUTEX_INITIALIZER;
static int nvme_rdma_qpair_destroy(struct spdk_nvme_qpair *qpair);
static inline struct nvme_rdma_qpair *
@ -700,17 +710,41 @@ static int
nvme_rdma_register_mem(struct nvme_rdma_qpair *rqpair)
{
struct ibv_pd *pd = rqpair->cm_id->qp->pd;
struct spdk_mem_map *mr_map;
struct spdk_nvme_rdma_mr_map *mr_map;
// TODO: look up existing mem map registration for this pd
pthread_mutex_lock(&g_rdma_mr_maps_mutex);
mr_map = spdk_mem_map_alloc((uint64_t)NULL, nvme_rdma_mr_map_notify, pd);
/* Look up existing mem map registration for this pd */
LIST_FOREACH(mr_map, &g_rdma_mr_maps, link) {
if (mr_map->pd == pd) {
mr_map->ref++;
rqpair->mr_map = mr_map;
pthread_mutex_unlock(&g_rdma_mr_maps_mutex);
return 0;
}
}
mr_map = calloc(1, sizeof(*mr_map));
if (mr_map == NULL) {
SPDK_ERRLOG("calloc() failed\n");
pthread_mutex_unlock(&g_rdma_mr_maps_mutex);
return -1;
}
mr_map->ref = 1;
mr_map->pd = pd;
mr_map->map = spdk_mem_map_alloc((uint64_t)NULL, nvme_rdma_mr_map_notify, pd);
if (mr_map == NULL) {
SPDK_ERRLOG("spdk_mem_map_alloc() failed\n");
free(mr_map);
pthread_mutex_unlock(&g_rdma_mr_maps_mutex);
return -1;
}
rqpair->mr_map = mr_map;
LIST_INSERT_HEAD(&g_rdma_mr_maps, mr_map, link);
pthread_mutex_unlock(&g_rdma_mr_maps_mutex);
return 0;
}
@ -718,7 +752,26 @@ nvme_rdma_register_mem(struct nvme_rdma_qpair *rqpair)
static void
nvme_rdma_unregister_mem(struct nvme_rdma_qpair *rqpair)
{
spdk_mem_map_free(&rqpair->mr_map);
struct spdk_nvme_rdma_mr_map *mr_map;
mr_map = rqpair->mr_map;
rqpair->mr_map = NULL;
if (mr_map == NULL) {
return;
}
pthread_mutex_lock(&g_rdma_mr_maps_mutex);
assert(mr_map->ref > 0);
mr_map->ref--;
if (mr_map->ref == 0) {
LIST_REMOVE(mr_map, link);
spdk_mem_map_free(&mr_map->map);
free(mr_map);
}
pthread_mutex_unlock(&g_rdma_mr_maps_mutex);
}
static int
@ -863,7 +916,7 @@ nvme_rdma_build_contig_request(struct nvme_rdma_qpair *rqpair, struct nvme_reque
assert(req->payload_size != 0);
assert(req->payload.type == NVME_PAYLOAD_TYPE_CONTIG);
mr = (struct ibv_mr *)spdk_mem_map_translate(rqpair->mr_map, (uint64_t)payload);
mr = (struct ibv_mr *)spdk_mem_map_translate(rqpair->mr_map->map, (uint64_t)payload);
if (mr == NULL) {
return -1;
}
@ -906,7 +959,7 @@ nvme_rdma_build_sgl_request(struct nvme_rdma_qpair *rqpair, struct nvme_request
return -1;
}
mr = (struct ibv_mr *)spdk_mem_map_translate(rqpair->mr_map, (uint64_t)virt_addr);
mr = (struct ibv_mr *)spdk_mem_map_translate(rqpair->mr_map->map, (uint64_t)virt_addr);
if (mr == NULL) {
return -1;
}