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nvme/rdma: Support sgl for readv/writev functions

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(1) Add nvme_rdma_build_sgl_request function
(2) Merge nvme_rdma_pre/post_copy_mem to nvme_rdma_copy_mem

Change-Id: I86abab821b32b4da0aa9489a6b9f7dc430333159
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
This commit is contained in:
Ziye Yang 2016-12-01 14:14:07 +08:00 committed by Daniel Verkamp
parent 6644241f7e
commit 90f13aa634
1 changed files with 124 additions and 68 deletions
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192
lib/nvme/nvme_rdma.c
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@ -233,52 +233,6 @@ nvme_rdma_qpair_init(struct nvme_rdma_qpair *rqpair)
return 0;
}
static void
nvme_rdma_pre_copy_mem(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
{
struct spdk_nvme_cmd *cmd;
struct spdk_nvme_sgl_descriptor *nvme_sgl;
void *address;
assert(rdma_req->bb_mr != NULL);
assert(rdma_req->bb != NULL);
nvme_sgl = &rdma_req->req->cmd.dptr.sgl1;
address = (void *)nvme_sgl->address;
if (address != NULL) {
if (rdma_req->xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER ||
rdma_req->xfer == SPDK_NVME_DATA_BIDIRECTIONAL) {
memcpy(rdma_req->bb, address, nvme_sgl->keyed.length);
}
cmd = &rqpair->cmds[rdma_req->id];
nvme_sgl = &cmd->dptr.sgl1;
nvme_sgl->address = (uint64_t)rdma_req->bb;
nvme_sgl->keyed.key = rdma_req->bb_rkey;
}
}
static void
nvme_rdma_post_copy_mem(struct spdk_nvme_rdma_req *rdma_req)
{
struct spdk_nvme_sgl_descriptor *nvme_sgl;
void *address;
assert(rdma_req != NULL);
assert(rdma_req->req != NULL);
nvme_sgl = &rdma_req->req->cmd.dptr.sgl1;
address = (void *)nvme_sgl->address;
if ((address != NULL) &&
(rdma_req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST ||
rdma_req->xfer == SPDK_NVME_DATA_BIDIRECTIONAL)) {
memcpy(address, rdma_req->bb, nvme_sgl->keyed.length);
}
}
#define nvme_rdma_trace_ibv_sge(sg_list) \
if (sg_list) { \
SPDK_TRACELOG(SPDK_TRACE_DEBUG, "local addr %p length 0x%x lkey 0x%x\n", \
@ -477,6 +431,72 @@ fail:
return -ENOMEM;
}
static int
nvme_rdma_copy_mem(struct spdk_nvme_rdma_req *rdma_req, bool copy_from_user)
{
int rc;
uint32_t remaining_transfer_len, len, offset = 0;
void *addr, *src, *dst;
struct spdk_nvme_sgl_descriptor *nvme_sgl;
struct nvme_request *req = rdma_req->req;
if (!req->payload_size) {
return 0;
}
nvme_sgl = &req->cmd.dptr.sgl1;
if (req->payload.type == NVME_PAYLOAD_TYPE_CONTIG) {
addr = (void *)((uint64_t)req->payload.u.contig + req->payload_offset);
if (!addr) {
return -1;
}
len = req->payload_size;
if (copy_from_user) {
src = addr;
dst = (void *)nvme_sgl->address;
} else {
src = (void *)nvme_sgl->address;
dst = addr;
}
memcpy(dst, src, len);
} else {
if (!req->payload.u.sgl.reset_sgl_fn ||
!req->payload.u.sgl.next_sge_fn) {
return -1;
}
req->payload.u.sgl.reset_sgl_fn(req->payload.u.sgl.cb_arg, req->payload_offset);
remaining_transfer_len = req->payload_size;
while (remaining_transfer_len > 0) {
rc = req->payload.u.sgl.next_sge_fn(req->payload.u.sgl.cb_arg,
&addr, &len);
if (rc || !addr) {
SPDK_ERRLOG("Invalid address returned from user next_sge_fn callback\n");
return -1;
}
len = nvme_min(remaining_transfer_len, len);
remaining_transfer_len -= len;
if (copy_from_user) {
src = addr;
dst = (void *)nvme_sgl->address + offset;
} else {
src = (void *)nvme_sgl->address + offset;
dst = addr;
}
memcpy(dst, src, len);
offset += len;
}
}
return 0;
}
static int
nvme_rdma_recv(struct nvme_rdma_qpair *rqpair, uint64_t rsp_idx)
{
@ -489,11 +509,18 @@ nvme_rdma_recv(struct nvme_rdma_qpair *rqpair, uint64_t rsp_idx)
rsp = &rqpair->rsps[rsp_idx];
rdma_req = &rqpair->rdma_reqs[rsp->cid];
nvme_rdma_post_copy_mem(rdma_req);
if (rdma_req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
if (nvme_rdma_copy_mem(rdma_req, false) < 0) {
SPDK_ERRLOG("Failed to copy to user memory\n");
goto done;
}
}
req = rdma_req->req;
nvme_rdma_req_complete(req, rsp);
nvme_rdma_req_put(rqpair, rdma_req);
done:
nvme_rdma_req_put(rqpair, rdma_req);
if (nvme_rdma_post_recv(rqpair, rsp_idx)) {
SPDK_ERRLOG("Unable to re-post rx descriptor\n");
return -1;
@ -786,32 +813,51 @@ nvme_rdma_qpair_connect(struct nvme_rdma_qpair *rqpair)
return 0;
}
/**
* Build SGL list describing scattered payload buffer.
*/
static int
nvme_rdma_build_sgl_request(struct spdk_nvme_rdma_req *rdma_req)
{
struct spdk_nvme_sgl_descriptor *nvme_sgl;
struct nvme_request *req = rdma_req->req;
if (req->payload_size > rdma_req->bb_mr->length) {
return -1;
}
if ((req->payload.type != NVME_PAYLOAD_TYPE_CONTIG) &&
(req->payload.type != NVME_PAYLOAD_TYPE_SGL)) {
return -1;
}
/* setup the RDMA SGL details */
nvme_sgl = &req->cmd.dptr.sgl1;
nvme_sgl->keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
nvme_sgl->keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
nvme_sgl->keyed.length = req->payload_size;
nvme_sgl->keyed.key = rdma_req->bb_rkey;
nvme_sgl->address = (uint64_t)rdma_req->bb;
req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_SGL;
if (rdma_req->xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
if (nvme_rdma_copy_mem(rdma_req, true) < 0) {
SPDK_ERRLOG("Failed to copy from user memory\n");
return -1;
}
}
return 0;
}
static int
nvme_rdma_req_init(struct nvme_rdma_qpair *rqpair, struct nvme_request *req,
struct spdk_nvme_rdma_req *rdma_req)
{
struct spdk_nvme_sgl_descriptor *nvme_sgl;
assert(rqpair != NULL);
assert(req != NULL);
rdma_req->req = req;
req->cmd.cid = rdma_req->id;
/* setup the RDMA SGL details */
nvme_sgl = &req->cmd.dptr.sgl1;
if (req->payload.type == NVME_PAYLOAD_TYPE_CONTIG) {
nvme_sgl->address = (uint64_t)req->payload.u.contig + req->payload_offset;
nvme_sgl->keyed.length = req->payload_size;
} else {
/* Need to handle other case later */
return -1;
}
rdma_req->req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_SGL;
nvme_sgl->keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
nvme_sgl->keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
if (req->cmd.opc == SPDK_NVME_OPC_FABRIC) {
struct spdk_nvmf_capsule_cmd *nvmf_cmd = (struct spdk_nvmf_capsule_cmd *)&req->cmd;
rdma_req->xfer = spdk_nvme_opc_get_data_transfer(nvmf_cmd->fctype);
@ -819,6 +865,16 @@ nvme_rdma_req_init(struct nvme_rdma_qpair *rqpair, struct nvme_request *req,
rdma_req->xfer = spdk_nvme_opc_get_data_transfer(req->cmd.opc);
}
/* We do not support bi-directional transfer yet */
if (rdma_req->xfer == SPDK_NVME_DATA_BIDIRECTIONAL) {
SPDK_ERRLOG("Do not support bi-directional data transfer\n");
return -1;
}
if (nvme_rdma_build_sgl_request(rdma_req) < 0) {
return -1;
}
memcpy(&rqpair->cmds[rdma_req->id], &req->cmd, sizeof(req->cmd));
return 0;
}
@ -1227,6 +1283,8 @@ nvme_rdma_qpair_submit_request(struct spdk_nvme_qpair *qpair,
int rc;
rqpair = nvme_rdma_qpair(qpair);
assert(rqpair != NULL);
assert(req != NULL);
rdma_req = nvme_rdma_req_get(rqpair);
if (!rdma_req) {
@ -1243,8 +1301,6 @@ nvme_rdma_qpair_submit_request(struct spdk_nvme_qpair *qpair,
return -1;
}
nvme_rdma_pre_copy_mem(rqpair, rdma_req);
wr = &rdma_req->send_wr;
wr->wr_id = (uint64_t)rdma_req;
wr->next = NULL;