| Message ID | 20210211211044.32701-8-borisp@mellanox.com |
|---|---|
| State | New |
| Headers | show |
| Series | nvme-tcp receive offloads | expand |
On 2/11/21 2:10 PM, Boris Pismenny wrote: > > +static int nvme_tcp_teardown_ddp(struct nvme_tcp_queue *queue, > + u16 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)) { > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); again, unnecessary. you only get here because the rquest is marked offloaded and that only happens if the netdev exists and supports DDP. > + 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); > + return ret; > +} > + > +static 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, req->status, req->result)) > + nvme_complete_rq(rq); > +} > + > +static int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, > + u16 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)) { > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); similarly here. you can't get here if netdev is null. > + return -EINVAL; > + } > + > + req->ddp.command_id = command_id; > + ret = nvme_tcp_req_map_sg(req, rq); > + if (ret) > + return -ENOMEM; > + > + 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 net_device *netdev = queue->ctrl->offloading_netdev; > @@ -343,7 +417,7 @@ static void nvme_tcp_resync_response(struct nvme_tcp_queue *queue, > return; > > if (unlikely(!netdev)) { > - pr_info_ratelimited("%s: netdev not found\n", __func__); > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); and per comment on the last patch, this is not needed. > @@ -849,10 +953,39 @@ 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) > { > + 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; > union nvme_result res = {}; > > - if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res)) > - nvme_complete_rq(rq); > + nvme_tcp_complete_request(rq, cpu_to_le16(status << 1), res, pdu->command_id); > +} > + > + > +static int nvme_tcp_consume_skb(struct nvme_tcp_queue *queue, struct sk_buff *skb, > + unsigned int *offset, struct iov_iter *iter, int recv_len) > +{ > + int ret; > + > +#ifdef CONFIG_TCP_DDP > + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags)) { > + if (queue->data_digest) > + ret = skb_ddp_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, > + queue->rcv_hash); > + else > + ret = skb_ddp_copy_datagram_iter(skb, *offset, iter, recv_len); > + } else { > +#endif why not make that a helper defined in the CONFIG_TCP_DDP section with an inline for the unset case. Keeps this code from being polluted with the ifdef checks. > + if (queue->data_digest) > + ret = skb_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, > + queue->rcv_hash); > + else > + ret = skb_copy_datagram_iter(skb, *offset, iter, recv_len); > +#ifdef CONFIG_TCP_DDP > + } > +#endif > + > + return ret; > } > > static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, > @@ -899,12 +1032,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, > recv_len = min_t(size_t, recv_len, > iov_iter_count(&req->iter)); > > - if (queue->data_digest) > - ret = skb_copy_and_hash_datagram_iter(skb, *offset, > - &req->iter, recv_len, queue->rcv_hash); > - else > - ret = skb_copy_datagram_iter(skb, *offset, > - &req->iter, recv_len); > + ret = nvme_tcp_consume_skb(queue, skb, offset, &req->iter, recv_len); > if (ret) { > dev_err(queue->ctrl->ctrl.device, > "queue %d failed to copy request %#x data", > @@ -1128,6 +1256,7 @@ 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; > > @@ -1136,6 +1265,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) > else > flags |= MSG_EOR; > > + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags) && > + blk_rq_nr_phys_segments(rq) && rq_data_dir(rq) == READ) > + nvme_tcp_setup_ddp(queue, pdu->cmd.common.command_id, rq); > + For consistency, shouldn't this be wrapped in the CONFIG_TCP_DDP check too? > if (queue->hdr_digest && !req->offset) > nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); >
On Sun, Feb 14, 2021 at 8:30 PM David Ahern <dsahern@gmail.com> wrote: > > On 2/11/21 2:10 PM, Boris Pismenny wrote: > > > > +static int nvme_tcp_teardown_ddp(struct nvme_tcp_queue *queue, > > + u16 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)) { > > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); > > again, unnecessary. you only get here because the rquest is marked > offloaded and that only happens if the netdev exists and supports DDP. > > > + 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); > > + return ret; > > +} > > + > > +static 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, req->status, req->result)) > > + nvme_complete_rq(rq); > > +} > > + > > +static int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, > > + u16 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)) { > > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); > > similarly here. you can't get here if netdev is null. > > > + return -EINVAL; > > + } > > + > > + req->ddp.command_id = command_id; > > + ret = nvme_tcp_req_map_sg(req, rq); > > + if (ret) > > + return -ENOMEM; > > + > > + 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 net_device *netdev = queue->ctrl->offloading_netdev; > > @@ -343,7 +417,7 @@ static void nvme_tcp_resync_response(struct nvme_tcp_queue *queue, > > return; > > > > if (unlikely(!netdev)) { > > - pr_info_ratelimited("%s: netdev not found\n", __func__); > > + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); > > and per comment on the last patch, this is not needed. > > > @@ -849,10 +953,39 @@ 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) > > { > > + 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; > > union nvme_result res = {}; > > > > - if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res)) > > - nvme_complete_rq(rq); > > + nvme_tcp_complete_request(rq, cpu_to_le16(status << 1), res, pdu->command_id); > > +} > > + > > + > > +static int nvme_tcp_consume_skb(struct nvme_tcp_queue *queue, struct sk_buff *skb, > > + unsigned int *offset, struct iov_iter *iter, int recv_len) > > +{ > > + int ret; > > + > > +#ifdef CONFIG_TCP_DDP > > + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags)) { > > + if (queue->data_digest) > > + ret = skb_ddp_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, > > + queue->rcv_hash); > > + else > > + ret = skb_ddp_copy_datagram_iter(skb, *offset, iter, recv_len); > > + } else { > > +#endif > > why not make that a helper defined in the CONFIG_TCP_DDP section with an > inline for the unset case. Keeps this code from being polluted with the > ifdef checks. will check that > > > + if (queue->data_digest) > > + ret = skb_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, > > + queue->rcv_hash); > > + else > > + ret = skb_copy_datagram_iter(skb, *offset, iter, recv_len); > > +#ifdef CONFIG_TCP_DDP > > + } > > +#endif > > + > > + return ret; > > } > > > > static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, > > @@ -899,12 +1032,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, > > recv_len = min_t(size_t, recv_len, > > iov_iter_count(&req->iter)); > > > > - if (queue->data_digest) > > - ret = skb_copy_and_hash_datagram_iter(skb, *offset, > > - &req->iter, recv_len, queue->rcv_hash); > > - else > > - ret = skb_copy_datagram_iter(skb, *offset, > > - &req->iter, recv_len); > > + ret = nvme_tcp_consume_skb(queue, skb, offset, &req->iter, recv_len); > > if (ret) { > > dev_err(queue->ctrl->ctrl.device, > > "queue %d failed to copy request %#x data", > > @@ -1128,6 +1256,7 @@ 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; > > > > @@ -1136,6 +1265,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) > > else > > flags |= MSG_EOR; > > > > + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags) && > > + blk_rq_nr_phys_segments(rq) && rq_data_dir(rq) == READ) > > + nvme_tcp_setup_ddp(queue, pdu->cmd.common.command_id, rq); > > + > > For consistency, shouldn't this be wrapped in the CONFIG_TCP_DDP check too? We tried to avoid the wrapping in some places where it was possible to do without adding confusion, this one is a good example IMOH. > > if (queue->hdr_digest && !req->offset) > > nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); > >
On 2/17/21 7:01 AM, Or Gerlitz wrote: >>> @@ -1136,6 +1265,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) >>> else >>> flags |= MSG_EOR; >>> >>> + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags) && >>> + blk_rq_nr_phys_segments(rq) && rq_data_dir(rq) == READ) >>> + nvme_tcp_setup_ddp(queue, pdu->cmd.common.command_id, rq); >>> + >> >> For consistency, shouldn't this be wrapped in the CONFIG_TCP_DDP check too? > > We tried to avoid the wrapping in some places where it was > possible to do without adding confusion, this one is a good > example IMOH. > > The above (and other locations like it) can easily be put into a helper that has logic when the CONFIG is enabled and compiles out when not. Consistency makes for simpler, cleaner code for optional features.
On 17/02/2021 19:00, David Ahern wrote: > On 2/17/21 7:01 AM, Or Gerlitz wrote: >>>> @@ -1136,6 +1265,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) >>>> else >>>> flags |= MSG_EOR; >>>> >>>> + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags) && >>>> + blk_rq_nr_phys_segments(rq) && rq_data_dir(rq) == READ) >>>> + nvme_tcp_setup_ddp(queue, pdu->cmd.common.command_id, rq); >>>> + >>> >>> For consistency, shouldn't this be wrapped in the CONFIG_TCP_DDP check too? >> >> We tried to avoid the wrapping in some places where it was >> possible to do without adding confusion, this one is a good >> example IMOH. >> >> > > The above (and other locations like it) can easily be put into a helper > that has logic when the CONFIG is enabled and compiles out when not. > Consistency makes for simpler, cleaner code for optional features. > The above is consistent in the sense that we wrap only places that are absolutely necessary, so as to avoid ifdefs as much as possible. Specifically, here and in ddp_teardown, we will add a wrapper to reduce clutter if offload is not used.
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 36de4391ba76..188e26ab7116 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -57,6 +57,11 @@ 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 { @@ -229,13 +234,82 @@ static inline size_t nvme_tcp_pdu_last_send(struct nvme_tcp_request *req, return nvme_tcp_pdu_data_left(req) <= len; } +static int nvme_tcp_req_map_sg(struct nvme_tcp_request *req, struct request *rq) +{ + int ret; + + 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); + return 0; +} + #ifdef CONFIG_TCP_DDP static bool nvme_tcp_resync_request(struct sock *sk, u32 seq, u32 flags); +static void nvme_tcp_ddp_teardown_done(void *ddp_ctx); static const struct tcp_ddp_ulp_ops nvme_tcp_ddp_ulp_ops = { .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, + u16 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)) { + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); + 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); + return ret; +} + +static 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, req->status, req->result)) + nvme_complete_rq(rq); +} + +static int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, + u16 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)) { + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); + return -EINVAL; + } + + req->ddp.command_id = command_id; + ret = nvme_tcp_req_map_sg(req, rq); + if (ret) + return -ENOMEM; + + 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 net_device *netdev = queue->ctrl->offloading_netdev; @@ -343,7 +417,7 @@ static void nvme_tcp_resync_response(struct nvme_tcp_queue *queue, return; if (unlikely(!netdev)) { - pr_info_ratelimited("%s: netdev not found\n", __func__); + dev_info_ratelimited(queue->ctrl->ctrl.device, "netdev not found\n"); return; } @@ -368,6 +442,20 @@ static bool nvme_tcp_resync_request(struct sock *sk, u32 seq, u32 flags) #else +static int nvme_tcp_setup_ddp(struct nvme_tcp_queue *queue, + u16 command_id, + struct request *rq) +{ + return -EINVAL; +} + +static int nvme_tcp_teardown_ddp(struct nvme_tcp_queue *queue, + u16 command_id, + struct request *rq) +{ + return -EINVAL; +} + static int nvme_tcp_offload_socket(struct nvme_tcp_queue *queue) { return -EINVAL; @@ -643,6 +731,24 @@ static void nvme_tcp_error_recovery(struct nvme_ctrl *ctrl) queue_work(nvme_reset_wq, &to_tcp_ctrl(ctrl)->err_work); } +static void nvme_tcp_complete_request(struct request *rq, + __le16 status, + union nvme_result result, + __u16 command_id) +{ + struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_tcp_queue *queue = req->queue; + + if (req->offloaded) { + req->status = status; + req->result = result; + nvme_tcp_teardown_ddp(queue, command_id, rq); + } else { + if (!nvme_try_complete_req(rq, status, result)) + nvme_complete_rq(rq); + } +} + static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue, struct nvme_completion *cqe) { @@ -657,10 +763,8 @@ 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); + nvme_tcp_complete_request(rq, cqe->status, cqe->result, cqe->command_id); queue->nr_cqe++; - return 0; } @@ -849,10 +953,39 @@ 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) { + 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; union nvme_result res = {}; - if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res)) - nvme_complete_rq(rq); + nvme_tcp_complete_request(rq, cpu_to_le16(status << 1), res, pdu->command_id); +} + + +static int nvme_tcp_consume_skb(struct nvme_tcp_queue *queue, struct sk_buff *skb, + unsigned int *offset, struct iov_iter *iter, int recv_len) +{ + int ret; + +#ifdef CONFIG_TCP_DDP + if (test_bit(NVME_TCP_Q_OFF_DDP, &queue->flags)) { + if (queue->data_digest) + ret = skb_ddp_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, + queue->rcv_hash); + else + ret = skb_ddp_copy_datagram_iter(skb, *offset, iter, recv_len); + } else { +#endif + if (queue->data_digest) + ret = skb_copy_and_hash_datagram_iter(skb, *offset, iter, recv_len, + queue->rcv_hash); + else + ret = skb_copy_datagram_iter(skb, *offset, iter, recv_len); +#ifdef CONFIG_TCP_DDP + } +#endif + + return ret; } static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, @@ -899,12 +1032,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb, recv_len = min_t(size_t, recv_len, iov_iter_count(&req->iter)); - if (queue->data_digest) - ret = skb_copy_and_hash_datagram_iter(skb, *offset, - &req->iter, recv_len, queue->rcv_hash); - else - ret = skb_copy_datagram_iter(skb, *offset, - &req->iter, recv_len); + ret = nvme_tcp_consume_skb(queue, skb, offset, &req->iter, recv_len); if (ret) { dev_err(queue->ctrl->ctrl.device, "queue %d failed to copy request %#x data", @@ -1128,6 +1256,7 @@ 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; @@ -1136,6 +1265,10 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req) else flags |= MSG_EOR; + if (test_bit(NVME_TCP_Q_OFF_DDP, &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)); @@ -2441,6 +2574,7 @@ 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))