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nvme/pcie: Refactor nvme_pcie_qpair_submit_request

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Use a lookup table with function pointers to build
the request depending on the payload type and SGL support.
This change helps to remove several if/else branches

Change-Id: I506e4290efc218be68fc8cfda4835b242a99aa77
Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/478191
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Alexey Marchuk 2019-12-11 14:29:37 +03:00 committed by Tomasz Zawadzki
parent 71159819b0
commit d23f3a85f7
1 changed files with 33 additions and 17 deletions
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50
lib/nvme/nvme_pcie.c
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@ -1787,6 +1787,15 @@ nvme_pcie_prp_list_append(struct nvme_tracker *tr, uint32_t *prp_index, void *vi
return 0;
}
static int
nvme_pcie_qpair_build_request_invalid(struct spdk_nvme_qpair *qpair,
struct nvme_request *req, struct nvme_tracker *tr)
{
assert(0);
nvme_pcie_fail_request_bad_vtophys(qpair, tr);
return -EINVAL;
}
/**
* Build PRP list describing physically contiguous payload buffer.
*/
@ -2023,6 +2032,23 @@ nvme_pcie_qpair_build_prps_sgl_request(struct spdk_nvme_qpair *qpair, struct nvm
return 0;
}
typedef int(*build_req_fn)(struct spdk_nvme_qpair *, struct nvme_request *, struct nvme_tracker *);
static build_req_fn const g_nvme_pcie_build_req_table[][2] = {
[NVME_PAYLOAD_TYPE_INVALID] = {
nvme_pcie_qpair_build_request_invalid, /* PRP */
nvme_pcie_qpair_build_request_invalid /* SGL */
},
[NVME_PAYLOAD_TYPE_CONTIG] = {
nvme_pcie_qpair_build_contig_request, /* PRP */
nvme_pcie_qpair_build_contig_hw_sgl_request /* SGL */
},
[NVME_PAYLOAD_TYPE_SGL] = {
nvme_pcie_qpair_build_prps_sgl_request, /* PRP */
nvme_pcie_qpair_build_hw_sgl_request /* SGL */
}
};
int
nvme_pcie_qpair_submit_request(struct spdk_nvme_qpair *qpair, struct nvme_request *req)
{
@ -2031,6 +2057,8 @@ nvme_pcie_qpair_submit_request(struct spdk_nvme_qpair *qpair, struct nvme_reques
void *md_payload;
struct spdk_nvme_ctrlr *ctrlr = qpair->ctrlr;
struct nvme_pcie_qpair *pqpair = nvme_pcie_qpair(qpair);
enum nvme_payload_type payload_type;
bool sgl_supported;
if (spdk_unlikely(nvme_qpair_is_admin_queue(qpair))) {
nvme_robust_mutex_lock(&ctrlr->ctrlr_lock);
@ -2064,25 +2092,13 @@ nvme_pcie_qpair_submit_request(struct spdk_nvme_qpair *qpair, struct nvme_reques
if (req->payload_size == 0) {
/* Null payload - leave PRP fields untouched */
rc = 0;
} else if (nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_CONTIG) {
} else {
payload_type = nvme_payload_type(&req->payload);
/* Some NVME drives can't handle SGL request submitted to the admin qpair
* even if they report SGL support */
if ((ctrlr->flags & SPDK_NVME_CTRLR_SGL_SUPPORTED) != 0 &&
!nvme_qpair_is_admin_queue(qpair)) {
rc = nvme_pcie_qpair_build_contig_hw_sgl_request(qpair, req, tr);
} else {
rc = nvme_pcie_qpair_build_contig_request(qpair, req, tr);
}
} else if (nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_SGL) {
if (ctrlr->flags & SPDK_NVME_CTRLR_SGL_SUPPORTED) {
rc = nvme_pcie_qpair_build_hw_sgl_request(qpair, req, tr);
} else {
rc = nvme_pcie_qpair_build_prps_sgl_request(qpair, req, tr);
}
} else {
assert(0);
nvme_pcie_fail_request_bad_vtophys(qpair, tr);
rc = -EINVAL;
sgl_supported = (ctrlr->flags & SPDK_NVME_CTRLR_SGL_SUPPORTED) != 0 &&
!nvme_qpair_is_admin_queue(qpair);
rc = g_nvme_pcie_build_req_table[payload_type][sgl_supported](qpair, req, tr);
}
if (rc < 0) {