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nvmf/tcp: Stay in AWAIT_PDU_READY state until atleast 1 byte arrives

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This doesn't fix any bug, but it makes more sense to leave the qpair
in the NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY state until it
receives at least one byte.

Change-Id: Ic5f34a733a80b58f65a1334fae7e07dbded2b3d0
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/441811
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>
This commit is contained in:
Ben Walker 2019-01-23 22:08:35 -07:00 committed by Jim Harris
parent c796c54794
commit 7a4d6af182
1 changed files with 15 additions and 16 deletions
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31
lib/nvmf/tcp.c
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@ -1228,6 +1228,7 @@ spdk_nvmf_tcp_qpair_set_recv_state(struct spdk_nvmf_tcp_qpair *tqpair,
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair(%p) recv state=%d\n", tqpair, state);
tqpair->recv_state = state;
switch (state) {
case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH:
case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PSH:
@ -1879,26 +1880,24 @@ spdk_nvmf_tcp_sock_process(struct spdk_nvmf_tcp_qpair *tqpair)
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair(%p) recv pdu entering state %d\n", tqpair, prev_state);
switch (tqpair->recv_state) {
/* If in a new state */
case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY:
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH);
break;
/* Wait for the common header */
case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY:
case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH:
pdu = &tqpair->pdu_in_progress;
/* common header */
if (pdu->ch_valid_bytes < sizeof(struct spdk_nvme_tcp_common_pdu_hdr)) {
rc = nvme_tcp_read_data(tqpair->sock,
sizeof(struct spdk_nvme_tcp_common_pdu_hdr) - pdu->ch_valid_bytes,
(void *)&pdu->hdr.common + pdu->ch_valid_bytes);
if (rc < 0) {
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "will disconnect tqpair=%p\n", tqpair);
return NVME_TCP_PDU_FATAL;
}
rc = nvme_tcp_read_data(tqpair->sock,
sizeof(struct spdk_nvme_tcp_common_pdu_hdr) - pdu->ch_valid_bytes,
(void *)&pdu->hdr.common + pdu->ch_valid_bytes);
if (rc < 0) {
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "will disconnect tqpair=%p\n", tqpair);
return NVME_TCP_PDU_FATAL;
} else if (rc > 0) {
pdu->ch_valid_bytes += rc;
if (pdu->ch_valid_bytes < sizeof(struct spdk_nvme_tcp_common_pdu_hdr)) {
return NVME_TCP_PDU_IN_PROGRESS;
}
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH);
}
if (pdu->ch_valid_bytes < sizeof(struct spdk_nvme_tcp_common_pdu_hdr)) {
return NVME_TCP_PDU_IN_PROGRESS;
}
/* The command header of this PDU has now been read from the socket. */