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nvmet: Introduce helper functions to allocate and free request SGLs 

Add helpers to allocate and free the SGL in a struct nvmet_req:

  int nvmet_req_alloc_sgl(struct nvmet_req *req)
  void nvmet_req_free_sgl(struct nvmet_req *req)

This will be expanded in a future patch to implement peer-to-peer memory
DMAs and should be common with all target drivers.

The new helpers are used in nvmet-rdma.  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 per request.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Logan Gunthorpe 2018-10-04 15:27:46 -06:00 committed by Bjorn Helgaas
parent e0596ab290
commit 5b2322e48c
3 changed files with 32 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/nvme/target/core.c
View File

@ -725,6 +725,24 @@ void nvmet_req_execute(struct nvmet_req *req)
}
EXPORT_SYMBOL_GPL(nvmet_req_execute);
int nvmet_req_alloc_sgl(struct nvmet_req *req)
{
req->sg = sgl_alloc(req->transfer_len, GFP_KERNEL, &req->sg_cnt);
if (!req->sg)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL_GPL(nvmet_req_alloc_sgl);
void nvmet_req_free_sgl(struct nvmet_req *req)
{
sgl_free(req->sg);
req->sg = NULL;
req->sg_cnt = 0;
}
EXPORT_SYMBOL_GPL(nvmet_req_free_sgl);
static inline bool nvmet_cc_en(u32 cc)
{
return (cc >> NVME_CC_EN_SHIFT) & 0x1;

2
drivers/nvme/target/nvmet.h
View File

@ -336,6 +336,8 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
void nvmet_req_uninit(struct nvmet_req *req);
void nvmet_req_execute(struct nvmet_req *req);
void nvmet_req_complete(struct nvmet_req *req, u16 status);
int nvmet_req_alloc_sgl(struct nvmet_req *req);
void nvmet_req_free_sgl(struct nvmet_req *req);
void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
u16 size);

20
drivers/nvme/target/rdma.c
View File

@ -503,7 +503,7 @@ 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);
@ -652,24 +652,24 @@ 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);
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) {
@ -678,6 +678,10 @@ 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)