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(gen-l-vrt-133.mtl.labs.mlnx [10.237.11.160]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 08UGKR2H032498; Wed, 30 Sep 2020 19:20:28 +0300 From: Boris Pismenny To: kuba@kernel.org, davem@davemloft.net, saeedm@nvidia.com, hch@lst.de, sagi@grimberg.me, axboe@fb.com, kbusch@kernel.org, viro@zeniv.linux.org.uk, edumazet@google.com Subject: [PATCH net-next RFC v1 06/10] nvme-tcp: Add DDP data-path Date: Wed, 30 Sep 2020 19:20:06 +0300 Message-Id: <20200930162010.21610-7-borisp@mellanox.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200930162010.21610-1-borisp@mellanox.com> References: <20200930162010.21610-1-borisp@mellanox.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200930_122034_728727_C08E307E X-CRM114-Status: GOOD ( 17.72 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yoray Zack , Ben Ben-Ishay , boris.pismenny@gmail.com, linux-nvme@lists.infradead.org, netdev@vger.kernel.org, Or Gerlitz Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Introduce the NVMe-TCP DDP data-path offload. Using this interface, the NIC hardware will scatter TCP payload directly to the BIO pages according to the command_id in the PDU. To maintain the correctness of the network stack, the driver is expected to construct SKBs that point to the BIO pages. The data-path interface contains two routines: tcp_ddp_setup/teardown. The setup provides the mapping from command_id to the request buffers, while the teardown removes this mapping. For efficiency, we introduce an asynchronous nvme completion, which is split between NVMe-TCP and the NIC driver as follows: NVMe-TCP performs the specific completion, while NIC driver performs the generic mq_blk completion. Signed-off-by: Boris Pismenny Signed-off-by: Ben Ben-Ishay Signed-off-by: Or Gerlitz Signed-off-by: Yoray Zack --- drivers/nvme/host/tcp.c | 121 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 117 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 06711ac095f2..7bd97f856677 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -56,6 +56,11 @@ struct nvme_tcp_request { size_t offset; size_t data_sent; enum nvme_tcp_send_state state; + + bool offloaded; + struct tcp_ddp_io ddp; + __le16 status; + union nvme_result result; }; enum nvme_tcp_queue_flags { @@ -231,10 +236,76 @@ static inline size_t nvme_tcp_pdu_last_send(struct nvme_tcp_request *req, #ifdef CONFIG_TCP_DDP bool nvme_tcp_resync_request(struct sock *sk, u32 seq, u32 flags); +void nvme_tcp_ddp_teardown_done(void *ddp_ctx); const struct tcp_ddp_ulp_ops nvme_tcp_ddp_ulp_ops __read_mostly = { + .resync_request = nvme_tcp_resync_request, + .ddp_teardown_done = nvme_tcp_ddp_teardown_done, }; +static +int nvme_tcp_teardown_ddp(struct nvme_tcp_queue *queue, + uint16_t command_id, + struct request *rq) +{ + struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq); + struct net_device *netdev = queue->ctrl->offloading_netdev; + int ret; + + if (unlikely(!netdev)) { + pr_info_ratelimited("%s: netdev not found\n", __func__); + return -EINVAL; + } + + ret = netdev->tcp_ddp_ops->tcp_ddp_teardown(netdev, queue->sock->sk, + &req->ddp, rq); + sg_free_table_chained(&req->ddp.sg_table, SG_CHUNK_SIZE); + req->offloaded = false; + return ret; +} + +void nvme_tcp_ddp_teardown_done(void *ddp_ctx) +{ + struct request *rq = ddp_ctx; + struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq); + + if (!nvme_try_complete_req(rq, cpu_to_le16(req->status << 1), req->result)) + nvme_complete_rq(rq); +} + +static +int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, + uint16_t command_id, + struct request *rq) +{ + struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq); + struct net_device *netdev = queue->ctrl->offloading_netdev; + int ret; + + req->offloaded = false; + + if (unlikely(!netdev)) { + pr_info_ratelimited("%s: netdev not found\n", __func__); + return -EINVAL; + } + + req->ddp.command_id = command_id; + req->ddp.sg_table.sgl = req->ddp.first_sgl; + ret = sg_alloc_table_chained(&req->ddp.sg_table, + blk_rq_nr_phys_segments(rq), req->ddp.sg_table.sgl, + SG_CHUNK_SIZE); + if (ret) + return -ENOMEM; + req->ddp.nents = blk_rq_map_sg(rq->q, rq, req->ddp.sg_table.sgl); + + ret = netdev->tcp_ddp_ops->tcp_ddp_setup(netdev, + queue->sock->sk, + &req->ddp); + if (!ret) + req->offloaded = true; + return ret; +} + static int nvme_tcp_offload_socket(struct nvme_tcp_queue *queue, struct nvme_tcp_config *config) @@ -351,6 +422,25 @@ bool nvme_tcp_resync_request(struct sock *sk, u32 seq, u32 flags) #else +static +int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, + uint16_t command_id, + struct request *rq) +{ + return -EINVAL; +} + +static +int nvme_tcp_teardown_ddp(struct nvme_tcp_queue *queue, + uint16_t command_id, + struct request *rq) +{ + return -EINVAL; +} + +void nvme_tcp_ddp_teardown_done(void *ddp_ctx) +{} + static int nvme_tcp_offload_socket(struct nvme_tcp_queue *queue, struct nvme_tcp_config *config) @@ -630,6 +720,7 @@ static void nvme_tcp_error_recovery(struct nvme_ctrl *ctrl) static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue, struct nvme_completion *cqe) { + struct nvme_tcp_request *req; struct request *rq; rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue), cqe->command_id); @@ -641,8 +732,15 @@ static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue, return -EINVAL; } - if (!nvme_try_complete_req(rq, cqe->status, cqe->result)) - nvme_complete_rq(rq); + req = blk_mq_rq_to_pdu(rq); + if (req->offloaded) { + req->status = cqe->status; + req->result = cqe->result; + nvme_tcp_teardown_ddp(queue, cqe->command_id, rq); + } else { + if (!nvme_try_complete_req(rq, cqe->status, cqe->result)) + nvme_complete_rq(rq); + } queue->nr_cqe++; return 0; @@ -836,9 +934,18 @@ static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb, static inline void nvme_tcp_end_request(struct request *rq, u16 status) { union nvme_result res = {}; + struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_tcp_queue *queue = req->queue; + struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu; - if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res)) - nvme_complete_rq(rq); + if (req->offloaded) { + req->status = cpu_to_le16(status << 1); + req->result = res; + nvme_tcp_teardown_ddp(queue, pdu->command_id, rq); + } else { + if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res)) + nvme_complete_rq(rq); + } } static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, @@ -1115,6 +1222,7 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) bool inline_data = nvme_tcp_has_inline_data(req); u8 hdgst = nvme_tcp_hdgst_len(queue); int len = sizeof(*pdu) + hdgst - req->offset; + struct request *rq = blk_mq_rq_from_pdu(req); int flags = MSG_DONTWAIT; int ret; @@ -1123,6 +1231,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) else flags |= MSG_EOR; + if (test_bit(NVME_TCP_Q_OFFLOADS, &queue->flags) && + blk_rq_nr_phys_segments(rq) && rq_data_dir(rq) == READ) + nvme_tcp_setup_ddp(queue, pdu->cmd.common.command_id, rq); + if (queue->hdr_digest && !req->offset) nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); @@ -2448,6 +2560,7 @@ static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns, req->data_len = blk_rq_nr_phys_segments(rq) ? blk_rq_payload_bytes(rq) : 0; req->curr_bio = rq->bio; + req->offloaded = false; if (rq_data_dir(rq) == WRITE && req->data_len <= nvme_tcp_inline_data_size(queue)) -- 2.24.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme