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nvme: In nvme_tcp_qpair_process_completions, do not call

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nvme_tcp_read_pdu in a loop

nvme_tcp_read_pdu itself has a loop in it that runs until no more data
is available, so the extra loop does nothing.

Change-Id: I1471018e396c43187d1f06bd18ce8a6846a71c94
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15139
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Ben Walker 2022-10-25 11:23:55 -07:00 committed by Jim Harris
parent 8b29c21118
commit 73b02ffdc3
2 changed files with 21 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
lib/nvme/nvme_tcp.c
View File

@ -1600,8 +1600,15 @@ nvme_tcp_read_pdu(struct nvme_tcp_qpair *tqpair, uint32_t *reaped, uint32_t max_
uint32_t data_len;
enum nvme_tcp_pdu_recv_state prev_state;
*reaped = tqpair->async_complete;
tqpair->async_complete = 0;
/* The loop here is to allow for several back-to-back state changes. */
do {
if (*reaped >= max_completions) {
break;
}
prev_state = tqpair->recv_state;
pdu = tqpair->recv_pdu;
switch (tqpair->recv_state) {
@ -1622,8 +1629,7 @@ nvme_tcp_read_pdu(struct nvme_tcp_qpair *tqpair, uint32_t *reaped, uint32_t max_
}
pdu->ch_valid_bytes += rc;
if (pdu->ch_valid_bytes < sizeof(struct spdk_nvme_tcp_common_pdu_hdr)) {
rc = NVME_TCP_PDU_IN_PROGRESS;
goto out;
return NVME_TCP_PDU_IN_PROGRESS;
}
/* The command header of this PDU has now been read from the socket. */
@ -1642,8 +1648,7 @@ nvme_tcp_read_pdu(struct nvme_tcp_qpair *tqpair, uint32_t *reaped, uint32_t max_
pdu->psh_valid_bytes += rc;
if (pdu->psh_valid_bytes < pdu->psh_len) {
rc = NVME_TCP_PDU_IN_PROGRESS;
goto out;
return NVME_TCP_PDU_IN_PROGRESS;
}
/* All header(ch, psh, head digist) of this PDU has now been read from the socket. */
@ -1671,8 +1676,7 @@ nvme_tcp_read_pdu(struct nvme_tcp_qpair *tqpair, uint32_t *reaped, uint32_t max_
pdu->rw_offset += rc;
if (pdu->rw_offset < data_len) {
rc = NVME_TCP_PDU_IN_PROGRESS;
goto out;
return NVME_TCP_PDU_IN_PROGRESS;
}
assert(pdu->rw_offset == data_len);
@ -1681,19 +1685,14 @@ nvme_tcp_read_pdu(struct nvme_tcp_qpair *tqpair, uint32_t *reaped, uint32_t max_
break;
case NVME_TCP_PDU_RECV_STATE_ERROR:
memset(pdu, 0, sizeof(struct nvme_tcp_pdu));
rc = NVME_TCP_PDU_FATAL;
break;
return NVME_TCP_PDU_FATAL;
default:
assert(0);
break;
}
} while (prev_state != tqpair->recv_state && *reaped + tqpair->async_complete < max_completions);
} while (prev_state != tqpair->recv_state);
out:
*reaped += tqpair->async_complete;
tqpair->async_complete = 0;
return rc;
return rc > 0 ? 0 : rc;
}
static void
@ -1758,24 +1757,18 @@ nvme_tcp_qpair_process_completions(struct spdk_nvme_qpair *qpair, uint32_t max_c
}
if (max_completions == 0) {
max_completions = tqpair->num_entries;
max_completions = spdk_max(tqpair->num_entries, 1);
} else {
max_completions = spdk_min(max_completions, tqpair->num_entries);
}
reaped = 0;
do {
rc = nvme_tcp_read_pdu(tqpair, &reaped, max_completions);
if (rc < 0) {
SPDK_DEBUGLOG(nvme, "Error polling CQ! (%d): %s\n",
errno, spdk_strerror(errno));
goto fail;
} else if (rc == 0) {
/* Partial PDU is read */
break;
}
} while (reaped < max_completions);
rc = nvme_tcp_read_pdu(tqpair, &reaped, max_completions);
if (rc < 0) {
SPDK_DEBUGLOG(nvme, "Error polling CQ! (%d): %s\n",
errno, spdk_strerror(errno));
goto fail;
}
if (spdk_unlikely(tqpair->qpair.ctrlr->timeout_enabled)) {
nvme_tcp_qpair_check_timeout(qpair);

1
test/unit/lib/nvme/nvme_tcp.c/nvme_tcp_ut.c
View File

@ -1376,6 +1376,7 @@ test_nvme_tcp_ctrlr_connect_qpair(void)
tqpair->send_pdu = &pdu;
tqpair->qpair.ctrlr = &ctrlr;
tqpair->qpair.state = NVME_QPAIR_CONNECTING;
tqpair->num_entries = 128;
ic_req = &pdu.hdr.ic_req;
tqpair->recv_pdu->hdr.common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_IC_RESP;