[PATCH v4 13/14] nvmet-rdma: Use new SGL alloc/free helper for requests

Logan Gunthorpe
2018-04-23T23:30:45Z

Use the new helpers introduced in the previous patch to allocate
the SGLs for the request.

Seeing we use req.transfer_len as the length of the SGL it is
set earlier and cleared on any error. It also seems to be unnecessary
to accumulate the length as the map_sgl functions should only ever
be called once.

Signed-off-by: Logan Gunthorpe <logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Cc: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
---
drivers/nvme/target/rdma.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 52e0c5d579a7..f7a3459d618f 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -430,7 +430,7 @@ static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
}

if (rsp->req.sg != &rsp->cmd->inline_sg)
- sgl_free(rsp->req.sg);
+ nvmet_req_free_sgl(&rsp->req);

if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
nvmet_rdma_process_wr_wait_list(queue);
@@ -564,24 +564,24 @@ static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
{
struct rdma_cm_id *cm_id = rsp->queue->cm_id;
u64 addr = le64_to_cpu(sgl->addr);
- u32 len = get_unaligned_le24(sgl->length);
u32 key = get_unaligned_le32(sgl->key);
int ret;

+ rsp->req.transfer_len = get_unaligned_le24(sgl->length);
+
/* no data command? */
- if (!len)
+ if (!rsp->req.transfer_len)
return 0;

- rsp->req.sg = sgl_alloc(len, GFP_KERNEL, &rsp->req.sg_cnt);
- if (!rsp->req.sg)
- return NVME_SC_INTERNAL;
+ ret = nvmet_req_alloc_sgl(&rsp->req, &rsp->queue->nvme_sq);
+ if (ret < 0)
+ goto error_out;

ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
nvmet_data_dir(&rsp->req));
if (ret < 0)
- return NVME_SC_INTERNAL;
- rsp->req.transfer_len += len;
+ goto error_out;
rsp->n_rdma += ret;

if (invalidate) {
@@ -590,6 +590,10 @@ static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
}

return 0;
+
+error_out:
+ rsp->req.transfer_len = 0;
+ return NVME_SC_INTERNAL;
}

static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
--
2.11.0