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nvme/tcp: simplify outstanding_reqs handling

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Avoid putting a new req on the outstanding_reqs
TAILQ until we know it can be initialized
successfully.  This avoids adding to the TAILQ
only to remove it just after.

This allow simplifies the outstanding_reqs TAILQ
handling, since reqs are now only inserted and
removed in one place each.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I5ccc41c14abd541ffcf2a602246e0671386840c7
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13991
Community-CI: Mellanox Build Bot
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Jim Harris 2022-08-10 20:56:23 +00:00 committed by Tomasz Zawadzki
parent b0396da090
commit 9396cb9a94
2 changed files with 6 additions and 3 deletions
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3
lib/nvme/nvme_tcp.c
View File

@ -200,7 +200,6 @@ nvme_tcp_req_get(struct nvme_tcp_qpair *tqpair)
tcp_req->ordering.raw = 0;
memset(tcp_req->pdu, 0, sizeof(struct nvme_tcp_pdu));
memset(&tcp_req->rsp, 0, sizeof(struct spdk_nvme_cpl));
TAILQ_INSERT_TAIL(&tqpair->outstanding_reqs, tcp_req, link);
return tcp_req;
}
@ -727,11 +726,11 @@ nvme_tcp_qpair_submit_request(struct spdk_nvme_qpair *qpair,
if (nvme_tcp_req_init(tqpair, req, tcp_req)) {
SPDK_ERRLOG("nvme_tcp_req_init() failed\n");
TAILQ_REMOVE(&tcp_req->tqpair->outstanding_reqs, tcp_req, link);
nvme_tcp_req_put(tqpair, tcp_req);
return -1;
}
TAILQ_INSERT_TAIL(&tqpair->outstanding_reqs, tcp_req, link);
return nvme_tcp_qpair_capsule_cmd_send(tqpair, tcp_req);
}

6
test/unit/lib/nvme/nvme_tcp.c/nvme_tcp_ut.c
View File

@ -581,7 +581,11 @@ test_nvme_tcp_req_get(void)
CU_ASSERT(tcp_req.r2tl_remain == 0);
CU_ASSERT(tcp_req.iovcnt == 0);
CU_ASSERT(tcp_req.ordering.raw == 0);
CU_ASSERT(!TAILQ_EMPTY(&tqpair.outstanding_reqs));
/* outstanding_reqs should still be empty - caller is responsible
* for putting it on the TAILQ after any other initialization is
* completed.
*/
CU_ASSERT(TAILQ_EMPTY(&tqpair.outstanding_reqs));
CU_ASSERT(TAILQ_EMPTY(&tqpair.free_reqs));
/* No tcp request available, expect fail */