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nvme/tcp: Complete request when all acks are received

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A preparation step for enabling zero copy in NVMEoF TCP initiator.
Make sure that we complete a request (call user's callback)
when all acknowledgements are received. For write operation -
when we received send cmd ack, h2c ack and response from target.
For read operation - when we received send cmd ack and c2h
completed

Since we can receive send ack after resp command, store
nvme completion received in resp command in a new field
added to tcp_req structure

Change-Id: Id10d506a346738c7a641a979e1c8f86bc07465a4
Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4204
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Alexey Marchuk 2020-09-01 11:15:09 +03:00 committed by Tomasz Zawadzki
parent 2d4af0c174
commit 7388e54de4
1 changed files with 55 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
lib/nvme/nvme_tcp.c
View File

@ -147,6 +147,7 @@ struct nvme_tcp_req {
uint32_t r2tl_remain_next;
struct nvme_tcp_qpair *tqpair;
TAILQ_ENTRY(nvme_tcp_req) link;
struct spdk_nvme_cpl rsp;
};
static void nvme_tcp_send_h2c_data(struct nvme_tcp_req *tcp_req);
@ -193,6 +194,7 @@ nvme_tcp_req_get(struct nvme_tcp_qpair *tqpair)
tcp_req->iovcnt = 0;
tcp_req->ordering.raw = 0;
memset(tcp_req->send_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;
@ -521,14 +523,38 @@ nvme_tcp_req_init(struct nvme_tcp_qpair *tqpair, struct nvme_request *req,
return 0;
}
static inline void
nvme_tcp_req_put_safe(struct nvme_tcp_req *tcp_req)
static inline bool
nvme_tcp_req_complete_safe(struct nvme_tcp_req *tcp_req)
{
if (tcp_req->ordering.bits.send_ack && tcp_req->ordering.bits.data_recv) {
struct spdk_nvme_cpl cpl;
spdk_nvme_cmd_cb user_cb;
void *user_cb_arg;
struct spdk_nvme_qpair *qpair;
struct nvme_request *req;
if (!(tcp_req->ordering.bits.send_ack && tcp_req->ordering.bits.data_recv)) {
return false;
}
assert(tcp_req->state == NVME_TCP_REQ_ACTIVE);
assert(tcp_req->tqpair != NULL);
assert(tcp_req->req != NULL);
SPDK_DEBUGLOG(SPDK_LOG_NVME, "complete tcp_req(%p) on tqpair=%p\n", tcp_req, tcp_req->tqpair);
/* Cache arguments to be passed to nvme_complete_request since tcp_req can be zeroed when released */
memcpy(&cpl, &tcp_req->rsp, sizeof(cpl));
user_cb = tcp_req->req->cb_fn;
user_cb_arg = tcp_req->req->cb_arg;
qpair = tcp_req->req->qpair;
req = tcp_req->req;
TAILQ_REMOVE(&tcp_req->tqpair->outstanding_reqs, tcp_req, link);
nvme_tcp_req_put(tcp_req->tqpair, tcp_req);
}
nvme_free_request(tcp_req->req);
nvme_complete_request(user_cb, user_cb_arg, qpair, req, &cpl);
return true;
}
static void
@ -536,12 +562,15 @@ nvme_tcp_qpair_cmd_send_complete(void *cb_arg)
{
struct nvme_tcp_req *tcp_req = cb_arg;
SPDK_DEBUGLOG(SPDK_LOG_NVME, "tcp req %p, cid %u, qid %u\n", tcp_req, tcp_req->cid,
tcp_req->tqpair->qpair.id);
tcp_req->ordering.bits.send_ack = 1;
/* Handle the r2t case */
if (spdk_unlikely(tcp_req->ordering.bits.h2c_send_waiting_ack)) {
SPDK_DEBUGLOG(SPDK_LOG_NVME, "tcp req %p, send H2C data\n", tcp_req);
nvme_tcp_send_h2c_data(tcp_req);
} else {
nvme_tcp_req_put_safe(tcp_req);
nvme_tcp_req_complete_safe(tcp_req);
}
}
@ -843,7 +872,6 @@ nvme_tcp_c2h_data_payload_handle(struct nvme_tcp_qpair *tqpair,
{
struct nvme_tcp_req *tcp_req;
struct spdk_nvme_tcp_c2h_data_hdr *c2h_data;
struct spdk_nvme_cpl cpl = {};
uint8_t flags;
tcp_req = pdu->req;
@ -857,20 +885,18 @@ nvme_tcp_c2h_data_payload_handle(struct nvme_tcp_qpair *tqpair,
nvme_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
if (flags & SPDK_NVME_TCP_C2H_DATA_FLAGS_SUCCESS) {
if (tcp_req->datao == tcp_req->req->payload_size) {
cpl.status.p = 0;
tcp_req->rsp.status.p = 0;
} else {
cpl.status.p = 1;
tcp_req->rsp.status.p = 1;
}
cpl.cid = tcp_req->cid;
cpl.sqid = tqpair->qpair.id;
nvme_tcp_req_complete(tcp_req, &cpl);
if (tcp_req->ordering.bits.send_ack) {
tcp_req->rsp.cid = tcp_req->cid;
tcp_req->rsp.sqid = tqpair->qpair.id;
tcp_req->ordering.bits.data_recv = 1;
if (nvme_tcp_req_complete_safe(tcp_req)) {
(*reaped)++;
}
tcp_req->ordering.bits.data_recv = 1;
nvme_tcp_req_put_safe(tcp_req);
}
}
@ -1028,34 +1054,30 @@ nvme_tcp_capsule_resp_hdr_handle(struct nvme_tcp_qpair *tqpair, struct nvme_tcp_
struct spdk_nvme_tcp_rsp *capsule_resp = &pdu->hdr.capsule_resp;
uint32_t cid, error_offset = 0;
enum spdk_nvme_tcp_term_req_fes fes;
struct spdk_nvme_cpl cpl;
SPDK_DEBUGLOG(SPDK_LOG_NVME, "enter\n");
cpl = capsule_resp->rccqe;
cid = cpl.cid;
/* Recv the pdu again */
nvme_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
cid = capsule_resp->rccqe.cid;
tcp_req = get_nvme_active_req_by_cid(tqpair, cid);
if (!tcp_req) {
SPDK_ERRLOG("no tcp_req is found with cid=%u for tqpair=%p\n", cid, tqpair);
fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
error_offset = offsetof(struct spdk_nvme_tcp_rsp, rccqe);
goto end;
}
nvme_tcp_req_complete(tcp_req, &cpl);
if (tcp_req->ordering.bits.send_ack) {
assert(tcp_req->req != NULL);
tcp_req->rsp = capsule_resp->rccqe;
tcp_req->ordering.bits.data_recv = 1;
/* Recv the pdu again */
nvme_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
if (nvme_tcp_req_complete_safe(tcp_req)) {
(*reaped)++;
}
tcp_req->ordering.bits.data_recv = 1;
nvme_tcp_req_put_safe(tcp_req);
SPDK_DEBUGLOG(SPDK_LOG_NVME, "complete tcp_req(%p) on tqpair=%p\n", tcp_req, tqpair);
return;
end:
@ -1174,7 +1196,7 @@ nvme_tcp_qpair_h2c_data_send_complete(void *cb_arg)
}
/* Need also call this function to free the resource */
nvme_tcp_req_put_safe(tcp_req);
nvme_tcp_req_complete_safe(tcp_req);
}
}