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nvmf/rdma: Add utility for detecting transfer direction

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This can probably be moved to the generic nvmf code
in the future, since nothing about it is RDMA specific.

Change-Id: I99103e174d99a619d36e519820a8a8a9b56473ac
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/374538
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Ben Walker 2017-08-16 13:22:39 -07:00
parent ea957ff3a6
commit 730750facf
1 changed files with 57 additions and 29 deletions
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86
lib/nvmf/rdma.c
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@ -751,6 +751,62 @@ spdk_nvmf_rdma_mem_notify(void *cb_ctx, struct spdk_mem_map *map,
return 0;
}
typedef enum spdk_nvme_data_transfer spdk_nvme_data_transfer_t;
static spdk_nvme_data_transfer_t
spdk_nvmf_rdma_request_get_xfer(struct spdk_nvmf_rdma_request *rdma_req)
{
enum spdk_nvme_data_transfer xfer;
struct spdk_nvme_cmd *cmd = &rdma_req->req.cmd->nvme_cmd;
struct spdk_nvme_sgl_descriptor *sgl = &cmd->dptr.sgl1;
/* Figure out data transfer direction */
if (cmd->opc == SPDK_NVME_OPC_FABRIC) {
xfer = spdk_nvme_opc_get_data_transfer(rdma_req->req.cmd->nvmf_cmd.fctype);
} else {
xfer = spdk_nvme_opc_get_data_transfer(cmd->opc);
/* Some admin commands are special cases */
if ((rdma_req->req.qpair->qid == 0) &&
((cmd->opc == SPDK_NVME_OPC_GET_FEATURES) ||
(cmd->opc == SPDK_NVME_OPC_SET_FEATURES))) {
switch (cmd->cdw10 & 0xff) {
case SPDK_NVME_FEAT_LBA_RANGE_TYPE:
case SPDK_NVME_FEAT_AUTONOMOUS_POWER_STATE_TRANSITION:
case SPDK_NVME_FEAT_HOST_IDENTIFIER:
break;
default:
xfer = SPDK_NVME_DATA_NONE;
}
}
}
if (xfer == SPDK_NVME_DATA_NONE) {
return xfer;
}
/* Even for commands that may transfer data, they could have specified 0 length.
* We want those to show up with xfer SPDK_NVME_DATA_NONE.
*/
switch (sgl->generic.type) {
case SPDK_NVME_SGL_TYPE_DATA_BLOCK:
case SPDK_NVME_SGL_TYPE_BIT_BUCKET:
case SPDK_NVME_SGL_TYPE_SEGMENT:
case SPDK_NVME_SGL_TYPE_LAST_SEGMENT:
if (sgl->unkeyed.length == 0) {
xfer = SPDK_NVME_DATA_NONE;
}
break;
case SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK:
if (sgl->keyed.length == 0) {
xfer = SPDK_NVME_DATA_NONE;
}
break;
}
return xfer;
}
static spdk_nvmf_request_prep_type
spdk_nvmf_request_prep_data(struct spdk_nvmf_request *req)
{
@ -768,25 +824,7 @@ spdk_nvmf_request_prep_data(struct spdk_nvmf_request *req)
req->length = 0;
req->data = NULL;
if (cmd->opc == SPDK_NVME_OPC_FABRIC) {
req->xfer = spdk_nvme_opc_get_data_transfer(req->cmd->nvmf_cmd.fctype);
} else {
req->xfer = spdk_nvme_opc_get_data_transfer(cmd->opc);
if ((req->qpair->type == QPAIR_TYPE_AQ) &&
((cmd->opc == SPDK_NVME_OPC_GET_FEATURES) ||
(cmd->opc == SPDK_NVME_OPC_SET_FEATURES))) {
switch (cmd->cdw10 & 0xff) {
case SPDK_NVME_FEAT_LBA_RANGE_TYPE:
case SPDK_NVME_FEAT_AUTONOMOUS_POWER_STATE_TRANSITION:
case SPDK_NVME_FEAT_HOST_IDENTIFIER:
break;
default:
req->xfer = SPDK_NVME_DATA_NONE;
break;
}
}
}
req->xfer = spdk_nvmf_rdma_request_get_xfer(rdma_req);
if (req->xfer == SPDK_NVME_DATA_NONE) {
return SPDK_NVMF_REQUEST_PREP_READY;
}
@ -805,11 +843,6 @@ spdk_nvmf_request_prep_data(struct spdk_nvmf_request *req)
return SPDK_NVMF_REQUEST_PREP_ERROR;
}
if (sgl->keyed.length == 0) {
req->xfer = SPDK_NVME_DATA_NONE;
return SPDK_NVMF_REQUEST_PREP_READY;
}
req->length = sgl->keyed.length;
req->data = spdk_mempool_get(rtransport->data_buf_pool);
if (!req->data) {
@ -856,11 +889,6 @@ spdk_nvmf_request_prep_data(struct spdk_nvmf_request *req)
return SPDK_NVMF_REQUEST_PREP_ERROR;
}
if (sgl->unkeyed.length == 0) {
req->xfer = SPDK_NVME_DATA_NONE;
return SPDK_NVMF_REQUEST_PREP_READY;
}
req->data = rdma_req->recv->buf + offset;
rdma_req->data_from_pool = false;
req->length = sgl->unkeyed.length;