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nvmf/tcp: Fix the recv state switch if no shared buffer available

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The purpose of this patch is to fix the issue when there is no
data buffer allocated, the previous method is wrong to set the
recv pdu state.

The reason is that:
1 When there is no data buffer allocated, we still need to handle
the incoming pdu. It means that  we should switch the pdu recv
state immedidately.

2 And when there is a buffer, we resume the req handling with the
allocated buffer, that time we should not switch the pdu receving
state of the tqpair.

Change-Id: I1cc2723acc7b0a17407c3a2e6273313a4e612916
Signed-off-by: Ziye Yang <optimistyzy@gmail.com>
Reviewed-on: https://review.gerrithub.io/436153
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Ziye Yang 2018-12-04 23:00:44 +08:00 committed by Jim Harris
parent 4c627d0af5
commit 408728025e
1 changed files with 40 additions and 23 deletions
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63
lib/nvmf/tcp.c
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@ -201,7 +201,8 @@ struct nvme_tcp_req {
uint32_t c2h_data_offset;
uint32_t c2h_data_pdu_num;
enum spdk_nvmf_tcp_req_state state;
enum spdk_nvmf_tcp_req_state state;
bool has_incapsule_data;
TAILQ_ENTRY(nvme_tcp_req) link;
TAILQ_ENTRY(nvme_tcp_req) state_link;
@ -313,6 +314,8 @@ struct spdk_nvmf_tcp_mgmt_channel {
TAILQ_HEAD(, nvme_tcp_req) pending_data_buf_queue;
};
static void spdk_nvmf_tcp_qpair_process_pending(struct spdk_nvmf_tcp_transport *ttransport,
struct nvme_tcp_qpair *tqpair);
static bool spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
struct nvme_tcp_req *tcp_req);
static void spdk_nvmf_tcp_handle_pending_c2h_data_queue(struct nvme_tcp_qpair *tqpair);
@ -393,6 +396,7 @@ spdk_nvmf_tcp_req_get(struct nvme_tcp_qpair *tqpair)
tcp_req->next_expected_r2t_offset = 0;
tcp_req->r2tl_remain = 0;
tcp_req->c2h_data_offset = 0;
tcp_req->has_incapsule_data = false;
spdk_nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_NEW);
return tcp_req;
@ -814,6 +818,7 @@ spdk_nvmf_tcp_qpair_flush_pdus_internal(struct nvme_tcp_qpair *tqpair)
struct nvme_tcp_pdu *pdu;
int pdu_length;
TAILQ_HEAD(, nvme_tcp_pdu) completed_pdus_list;
struct spdk_nvmf_tcp_transport *ttransport;
pdu = TAILQ_FIRST(&tqpair->send_queue);
@ -898,6 +903,9 @@ spdk_nvmf_tcp_qpair_flush_pdus_internal(struct nvme_tcp_qpair *tqpair)
spdk_nvmf_tcp_pdu_put(pdu);
}
ttransport = SPDK_CONTAINEROF(tqpair->qpair.transport, struct spdk_nvmf_tcp_transport, transport);
spdk_nvmf_tcp_qpair_process_pending(ttransport, tqpair);
return TAILQ_EMPTY(&tqpair->send_queue) ? 0 : 1;
}
@ -2369,32 +2377,18 @@ request_transfer_out(struct spdk_nvmf_request *req)
}
static void
spdk_nvmf_tcp_pdu_set_buf_from_req(struct spdk_nvmf_tcp_transport *ttransport,
struct nvme_tcp_qpair *tqpair,
spdk_nvmf_tcp_pdu_set_buf_from_req(struct nvme_tcp_qpair *tqpair,
struct nvme_tcp_req *tcp_req)
{
struct nvme_tcp_pdu *pdu;
uint32_t plen = 0;
pdu = &tqpair->pdu_in_progress;
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair=%p\n", tqpair);
assert(pdu->hdr.common.pdu_type == SPDK_NVME_TCP_PDU_TYPE_CAPSULE_CMD);
plen = pdu->hdr.common.hlen;
if (tqpair->host_hdgst_enable) {
plen += SPDK_NVME_TCP_DIGEST_LEN;
}
/* need to send r2t for data */
if (pdu->hdr.common.plen == plen) {
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
if (tcp_req->data_from_pool) {
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Will send r2t for tcp_req(%p) on tqpair=%p\n", tcp_req, tqpair);
tcp_req->next_expected_r2t_offset = 0;
spdk_nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_DATA_PENDING_FOR_R2T);
spdk_nvmf_tcp_handle_queued_r2t_req(tqpair);
} else {
pdu = &tqpair->pdu_in_progress;
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Not need to send r2t for tcp_req(%p) on tqpair=%p\n", tcp_req,
tqpair);
/* No need to send r2t, contained in the capsuled data */
@ -2405,6 +2399,25 @@ spdk_nvmf_tcp_pdu_set_buf_from_req(struct spdk_nvmf_tcp_transport *ttransport,
}
}
static void
spdk_nvmf_tcp_set_incapsule_data(struct nvme_tcp_qpair *tqpair,
struct nvme_tcp_req *tcp_req)
{
struct nvme_tcp_pdu *pdu;
uint32_t plen = 0;
pdu = &tqpair->pdu_in_progress;
plen = pdu->hdr.common.hlen;
if (tqpair->host_hdgst_enable) {
plen += SPDK_NVME_TCP_DIGEST_LEN;
}
if (pdu->hdr.common.plen != plen) {
tcp_req->has_incapsule_data = true;
}
}
static bool
spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
struct nvme_tcp_req *tcp_req)
@ -2447,6 +2460,12 @@ spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
break;
}
spdk_nvmf_tcp_set_incapsule_data(tqpair, tcp_req);
if (!tcp_req->has_incapsule_data) {
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
}
spdk_nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_NEED_BUFFER);
TAILQ_INSERT_TAIL(&tqpair->ch->pending_data_buf_queue, tcp_req, link);
break;
@ -2455,7 +2474,7 @@ spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
assert(tcp_req->req.xfer != SPDK_NVME_DATA_NONE);
if (tcp_req != TAILQ_FIRST(&tqpair->ch->pending_data_buf_queue)) {
if (!tcp_req->has_incapsule_data && (tcp_req != TAILQ_FIRST(&tqpair->ch->pending_data_buf_queue))) {
SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP,
"Not the first element to wait for the buf for tcp_req(%p) on tqpair=%p\n",
tcp_req, tqpair);
@ -2469,7 +2488,7 @@ spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
TAILQ_REMOVE(&tqpair->ch->pending_data_buf_queue, tcp_req, link);
rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
/* Reset the tqpair receving pdu state */
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_ERROR);
spdk_nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_COMPLETE);
break;
}
@ -2485,11 +2504,10 @@ spdk_nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
/* If data is transferring from host to controller, we need to do a transfer from the host. */
if (tcp_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
spdk_nvmf_tcp_pdu_set_buf_from_req(ttransport, tqpair, tcp_req);
spdk_nvmf_tcp_pdu_set_buf_from_req(tqpair, tcp_req);
break;
}
spdk_nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
spdk_nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
break;
case TCP_REQUEST_STATE_DATA_PENDING_FOR_R2T:
@ -2591,7 +2609,6 @@ spdk_nvmf_tcp_sock_cb(void *arg, struct spdk_sock_group *group, struct spdk_sock
ttransport = SPDK_CONTAINEROF(tqpair->qpair.transport, struct spdk_nvmf_tcp_transport, transport);
spdk_nvmf_tcp_qpair_process_pending(ttransport, tqpair);
rc = spdk_nvmf_tcp_sock_process(tqpair);
if (rc < 0) {
tqpair->state = NVME_TCP_QPAIR_STATE_EXITING;