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>
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 9c71083..d6bc43e 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -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;