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nvmf/rdma: Simplify nvmf_rdma_fill_wr_sge() by using cached pointers

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Cache pointers to iovec and ibv_sge at the head of the function
and use them throughout.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I493759bf3989ced4390d077280cd44c122847d08
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/469348
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Seth Howell <seth.howell@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Alexey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Shuhei Matsumoto 2019-09-25 07:46:41 +09:00 committed by Jim Harris
parent 89a28bfd1b
commit 5e8858d7a3
1 changed files with 10 additions and 8 deletions
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18
lib/nvmf/rdma.c
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@ -1623,25 +1623,27 @@ nvmf_rdma_fill_wr_sge(struct spdk_nvmf_rdma_device *device,
struct spdk_nvmf_request *req, struct ibv_send_wr *wr)
{
uint64_t translation_len;
struct iovec *iov = &req->iov[req->iovcnt];
struct ibv_sge *sg_ele = &wr->sg_list[wr->num_sge];
translation_len = req->iov[req->iovcnt].iov_len;
translation_len = iov->iov_len;
if (!g_nvmf_hooks.get_rkey) {
wr->sg_list[wr->num_sge].lkey = ((struct ibv_mr *)spdk_mem_map_translate(device->map,
(uint64_t)req->iov[req->iovcnt].iov_base, &translation_len))->lkey;
sg_ele->lkey = ((struct ibv_mr *)spdk_mem_map_translate(device->map,
(uint64_t)iov->iov_base, &translation_len))->lkey;
} else {
wr->sg_list[wr->num_sge].lkey = spdk_mem_map_translate(device->map,
(uint64_t)req->iov[req->iovcnt].iov_base, &translation_len);
sg_ele->lkey = spdk_mem_map_translate(device->map,
(uint64_t)iov->iov_base, &translation_len);
}
if (spdk_unlikely(translation_len < req->iov[req->iovcnt].iov_len)) {
if (spdk_unlikely(translation_len < iov->iov_len)) {
/* This is a very rare case that can occur when using DPDK version < 19.05 */
SPDK_ERRLOG("Data buffer split over multiple RDMA Memory Regions. Removing it from circulation.\n");
return false;
}
wr->sg_list[wr->num_sge].addr = (uintptr_t)(req->iov[req->iovcnt].iov_base);
wr->sg_list[wr->num_sge].length = req->iov[req->iovcnt].iov_len;
sg_ele->addr = (uintptr_t)(iov->iov_base);
sg_ele->length = iov->iov_len;
wr->num_sge++;
return true;