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| author | Logan Gunthorpe <logang@deltatee.com> | 2018-10-04 23:27:46 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-10-17 19:18:23 +0200 |
| commit | 5b2322e48c978fd91d50873491b1c3b0a3b0266b (patch) | |
| tree | fcb31f70487da3f25d6584aba8f4b1f3c2b9893a /drivers/nvme/target/nvmet.h | |
| parent | nvme-pci: Add support for P2P memory in requests (diff) | |
| download | linux-5b2322e48c978fd91d50873491b1c3b0a3b0266b.tar.xz linux-5b2322e48c978fd91d50873491b1c3b0a3b0266b.zip | |
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>
Diffstat (limited to 'drivers/nvme/target/nvmet.h')
| -rw-r--r-- | drivers/nvme/target/nvmet.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index ec9af4ee03b6..e7b7406c4e22 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -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); |