nvme: use driver pdu command for passthrough

All nvme transport drivers preallocate an nvme command for each request.
Assume to use that command for nvme_setup_cmd() instead of requiring
drivers pass a pointer to it. All nvme drivers must initialize the
generic nvme_request 'cmd' to point to the transport's preallocated
nvme_command.

The generic nvme_request cmd pointer had previously been used only as a
temporary copy for passthrough commands. Since it now points to the
command that gets dispatched, passthrough commands must directly set it
up prior to executing the request.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Keith Busch 2021-03-17 13:37:03 -07:00 committed by Christoph Hellwig
parent af7fae857e
commit f4b9e6c90c
7 changed files with 25 additions and 23 deletions

View file

@ -575,6 +575,9 @@ EXPORT_SYMBOL_NS_GPL(nvme_put_ns, NVME_TARGET_PASSTHRU);
static inline void nvme_clear_nvme_request(struct request *req)
{
struct nvme_command *cmd = nvme_req(req)->cmd;
memset(cmd, 0, sizeof(*cmd));
nvme_req(req)->retries = 0;
nvme_req(req)->flags = 0;
req->rq_flags |= RQF_DONTPREP;
@ -593,9 +596,12 @@ static inline void nvme_init_request(struct request *req,
else /* no queuedata implies admin queue */
req->timeout = NVME_ADMIN_TIMEOUT;
/* passthru commands should let the driver set the SGL flags */
cmd->common.flags &= ~NVME_CMD_SGL_ALL;
req->cmd_flags |= REQ_FAILFAST_DRIVER;
nvme_clear_nvme_request(req);
nvme_req(req)->cmd = cmd;
memcpy(nvme_req(req)->cmd, cmd, sizeof(*cmd));
}
struct request *nvme_alloc_request(struct request_queue *q,
@ -724,14 +730,6 @@ static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
}
static inline void nvme_setup_passthrough(struct request *req,
struct nvme_command *cmd)
{
memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
/* passthru commands should let the driver set the SGL flags */
cmd->common.flags &= ~NVME_CMD_SGL_ALL;
}
static inline void nvme_setup_flush(struct nvme_ns *ns,
struct nvme_command *cmnd)
{
@ -886,19 +884,18 @@ void nvme_cleanup_cmd(struct request *req)
}
EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmd)
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req)
{
struct nvme_command *cmd = nvme_req(req)->cmd;
blk_status_t ret = BLK_STS_OK;
if (!(req->rq_flags & RQF_DONTPREP))
nvme_clear_nvme_request(req);
memset(cmd, 0, sizeof(*cmd));
switch (req_op(req)) {
case REQ_OP_DRV_IN:
case REQ_OP_DRV_OUT:
nvme_setup_passthrough(req, cmd);
/* these are setup prior to execution in nvme_init_request() */
break;
case REQ_OP_FLUSH:
nvme_setup_flush(ns, cmd);

View file

@ -2128,6 +2128,7 @@ nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq,
op->op.fcp_req.first_sgl = op->sgl;
op->op.fcp_req.private = &op->priv[0];
nvme_req(rq)->ctrl = &ctrl->ctrl;
nvme_req(rq)->cmd = &op->op.cmd_iu.sqe;
return res;
}
@ -2759,8 +2760,6 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
struct nvme_fc_ctrl *ctrl = queue->ctrl;
struct request *rq = bd->rq;
struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
struct nvme_command *sqe = &cmdiu->sqe;
enum nvmefc_fcp_datadir io_dir;
bool queue_ready = test_bit(NVME_FC_Q_LIVE, &queue->flags);
u32 data_len;
@ -2770,7 +2769,7 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq);
ret = nvme_setup_cmd(ns, rq, sqe);
ret = nvme_setup_cmd(ns, rq);
if (ret)
return ret;

View file

@ -623,8 +623,7 @@ void nvme_start_freeze(struct nvme_ctrl *ctrl);
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, blk_mq_req_flags_t flags);
void nvme_cleanup_cmd(struct request *req);
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmd);
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req);
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buf, unsigned bufflen);
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,

View file

@ -430,6 +430,7 @@ static int nvme_init_request(struct blk_mq_tag_set *set, struct request *req,
iod->nvmeq = nvmeq;
nvme_req(req)->ctrl = &dev->ctrl;
nvme_req(req)->cmd = &iod->cmd;
return 0;
}
@ -932,7 +933,7 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
if (unlikely(!test_bit(NVMEQ_ENABLED, &nvmeq->flags)))
return BLK_STS_IOERR;
ret = nvme_setup_cmd(ns, req, cmnd);
ret = nvme_setup_cmd(ns, req);
if (ret)
return ret;

View file

@ -314,6 +314,7 @@ static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
NVME_RDMA_DATA_SGL_SIZE;
req->queue = queue;
nvme_req(rq)->cmd = req->sqe.data;
return 0;
}
@ -2038,7 +2039,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
struct request *rq = bd->rq;
struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
struct nvme_rdma_qe *sqe = &req->sqe;
struct nvme_command *c = sqe->data;
struct nvme_command *c = nvme_req(rq)->cmd;
struct ib_device *dev;
bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
blk_status_t ret;
@ -2061,7 +2062,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
ib_dma_sync_single_for_cpu(dev, sqe->dma,
sizeof(struct nvme_command), DMA_TO_DEVICE);
ret = nvme_setup_cmd(ns, rq, c);
ret = nvme_setup_cmd(ns, rq);
if (ret)
goto unmap_qe;

View file

@ -417,6 +417,7 @@ static int nvme_tcp_init_request(struct blk_mq_tag_set *set,
{
struct nvme_tcp_ctrl *ctrl = set->driver_data;
struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
struct nvme_tcp_cmd_pdu *pdu;
int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
struct nvme_tcp_queue *queue = &ctrl->queues[queue_idx];
u8 hdgst = nvme_tcp_hdgst_len(queue);
@ -427,8 +428,10 @@ static int nvme_tcp_init_request(struct blk_mq_tag_set *set,
if (!req->pdu)
return -ENOMEM;
pdu = req->pdu;
req->queue = queue;
nvme_req(rq)->ctrl = &ctrl->ctrl;
nvme_req(rq)->cmd = &pdu->cmd;
return 0;
}
@ -2259,7 +2262,7 @@ static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns,
u8 hdgst = nvme_tcp_hdgst_len(queue), ddgst = 0;
blk_status_t ret;
ret = nvme_setup_cmd(ns, rq, &pdu->cmd);
ret = nvme_setup_cmd(ns, rq);
if (ret)
return ret;

View file

@ -141,7 +141,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready))
return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req);
ret = nvme_setup_cmd(ns, req, &iod->cmd);
ret = nvme_setup_cmd(ns, req);
if (ret)
return ret;
@ -205,8 +205,10 @@ static int nvme_loop_init_request(struct blk_mq_tag_set *set,
unsigned int numa_node)
{
struct nvme_loop_ctrl *ctrl = set->driver_data;
struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
nvme_req(req)->ctrl = &ctrl->ctrl;
nvme_req(req)->cmd = &iod->cmd;
return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
(set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
}