From mboxrd@z Thu Jan 1 00:00:00 1970 From: Logan Gunthorpe Subject: [PATCH v4 12/14] nvmet: Introduce helper functions to allocate and free request SGLs Date: Mon, 23 Apr 2018 17:30:44 -0600 Message-ID: <20180423233046.21476-13-logang@deltatee.com> References: <20180423233046.21476-1-logang@deltatee.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180423233046.21476-1-logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Jens Axboe , =?UTF-8?q?Christian=20K=C3=B6nig?= , Benjamin Herrenschmidt , Alex Williamson , Keith Busch , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jason Gunthorpe , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig List-Id: linux-rdma@vger.kernel.org Add helpers to allocate and free the SGL in a struct nvmet_req: int nvmet_req_alloc_sgl(struct nvmet_req *req, struct nvmet_sq *sq) 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 presently unused 'sq' argument in the alloc function will be necessary to decide whether to use peer-to-peer memory and obtain the correct provider to allocate the memory. Signed-off-by: Logan Gunthorpe Cc: Christoph Hellwig Cc: Sagi Grimberg --- drivers/nvme/target/core.c | 18 ++++++++++++++++++ drivers/nvme/target/nvmet.h | 2 ++ 2 files changed, 20 insertions(+) diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index e95424f172fd..75d44bc3e8d3 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -575,6 +575,24 @@ void nvmet_req_execute(struct nvmet_req *req) } EXPORT_SYMBOL_GPL(nvmet_req_execute); +int nvmet_req_alloc_sgl(struct nvmet_req *req, struct nvmet_sq *sq) +{ + 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; diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 15fd84ab21f8..10b162615a5e 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -273,6 +273,8 @@ 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, struct nvmet_sq *sq); +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); -- 2.11.0