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nvme/tcp host: Support the multiple SGL in host side.

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Current the idea is:

Convert the multiple SGL into the single SGL and send it
out.

Change-Id: I8e571704e9d7c7b583f889837eead7cac1982fcd
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448262
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Ziye Yang 2019-03-18 18:07:04 +08:00 committed by Jim Harris
parent 55f5b205c5
commit 18b3e74186
1 changed files with 53 additions and 12 deletions
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59
lib/nvme/nvme_tcp.c
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@ -110,7 +110,8 @@ struct nvme_tcp_req {
uint32_t r2tl_remain;
bool in_capsule_data;
struct nvme_tcp_pdu send_pdu;
void *buf;
struct iovec iov[NVME_TCP_MAX_SGL_DESCRIPTORS];
uint32_t iovcnt;
TAILQ_ENTRY(nvme_tcp_req) link;
};
@ -147,7 +148,7 @@ nvme_tcp_req_get(struct nvme_tcp_qpair *tqpair)
tcp_req->req = NULL;
tcp_req->in_capsule_data = false;
tcp_req->r2tl_remain = 0;
tcp_req->buf = NULL;
tcp_req->iovcnt = 0;
memset(&tcp_req->send_pdu, 0, sizeof(tcp_req->send_pdu));
TAILQ_INSERT_TAIL(&tqpair->outstanding_reqs, tcp_req, link);
@ -481,7 +482,10 @@ static int
nvme_tcp_build_contig_request(struct nvme_tcp_qpair *tqpair, struct nvme_tcp_req *tcp_req)
{
struct nvme_request *req = tcp_req->req;
tcp_req->buf = req->payload.contig_or_cb_arg + req->payload_offset;
tcp_req->iov[0].iov_base = req->payload.contig_or_cb_arg + req->payload_offset;
tcp_req->iov[0].iov_len = req->payload_size;
tcp_req->iovcnt = 1;
SPDK_DEBUGLOG(SPDK_LOG_NVME, "enter\n");
@ -496,8 +500,9 @@ nvme_tcp_build_contig_request(struct nvme_tcp_qpair *tqpair, struct nvme_tcp_req
static int
nvme_tcp_build_sgl_request(struct nvme_tcp_qpair *tqpair, struct nvme_tcp_req *tcp_req)
{
int rc;
int rc, iovcnt;
uint32_t length;
uint64_t remaining_size;
struct nvme_request *req = tcp_req->req;
SPDK_DEBUGLOG(SPDK_LOG_NVME, "enter\n");
@ -508,18 +513,29 @@ nvme_tcp_build_sgl_request(struct nvme_tcp_qpair *tqpair, struct nvme_tcp_req *t
assert(req->payload.next_sge_fn != NULL);
req->payload.reset_sgl_fn(req->payload.contig_or_cb_arg, req->payload_offset);
/* TODO: for now, we only support a single SGL entry */
rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &tcp_req->buf, &length);
remaining_size = req->payload_size;
iovcnt = 0;
do {
rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &tcp_req->iov[iovcnt].iov_base,
&length);
if (rc) {
return -1;
}
if (length < req->payload_size) {
SPDK_ERRLOG("multi-element SGL currently not supported for TCP now\n");
tcp_req->iov[iovcnt].iov_len = length;
remaining_size -= length;
iovcnt++;
} while (remaining_size > 0 && iovcnt < NVME_TCP_MAX_SGL_DESCRIPTORS);
/* Should be impossible if we did our sgl checks properly up the stack, but do a sanity check here. */
if (remaining_size > 0) {
return -1;
}
tcp_req->iovcnt = iovcnt;
return 0;
}
@ -591,7 +607,32 @@ nvme_tcp_pdu_set_data_buf(struct nvme_tcp_pdu *pdu,
struct nvme_tcp_req *tcp_req,
uint32_t data_len)
{
nvme_tcp_pdu_set_data(pdu, (void *)((uint64_t)tcp_req->buf + tcp_req->datao), data_len);
uint32_t i, remain_len, len;
struct _iov_ctx *ctx;
if (tcp_req->iovcnt == 1) {
nvme_tcp_pdu_set_data(pdu, (void *)((uint64_t)tcp_req->iov[0].iov_base + tcp_req->datao), data_len);
} else {
i = 0;
ctx = &pdu->iov_ctx;
assert(tcp_req->iovcnt <= NVME_TCP_MAX_SGL_DESCRIPTORS);
_iov_ctx_init(ctx, pdu->data_iov, tcp_req->iovcnt, tcp_req->datao);
remain_len = data_len;
while (remain_len > 0) {
assert(i < NVME_TCP_MAX_SGL_DESCRIPTORS);
len = spdk_min(remain_len, tcp_req->iov[i].iov_len);
remain_len -= len;
if (!_iov_ctx_set_iov(ctx, tcp_req->iov[i].iov_base, len)) {
break;
}
i++;
}
assert(remain_len == 0);
pdu->data_iovcnt = ctx->iovcnt;
pdu->data_len = data_len;
}
}
static int