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1847 lines
44 KiB
1847 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* NVMe over Fabrics TCP target. |
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* Copyright (c) 2018 Lightbits Labs. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/nvme-tcp.h> |
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#include <net/sock.h> |
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#include <net/tcp.h> |
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#include <linux/inet.h> |
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#include <linux/llist.h> |
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#include <crypto/hash.h> |
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|
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#include "nvmet.h" |
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|
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#define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE) |
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|
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/* Define the socket priority to use for connections were it is desirable |
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* that the NIC consider performing optimized packet processing or filtering. |
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* A non-zero value being sufficient to indicate general consideration of any |
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* possible optimization. Making it a module param allows for alternative |
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* values that may be unique for some NIC implementations. |
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*/ |
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static int so_priority; |
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module_param(so_priority, int, 0644); |
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MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority"); |
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|
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/* Define a time period (in usecs) that io_work() shall sample an activated |
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* queue before determining it to be idle. This optional module behavior |
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* can enable NIC solutions that support socket optimized packet processing |
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* using advanced interrupt moderation techniques. |
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*/ |
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static int idle_poll_period_usecs; |
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module_param(idle_poll_period_usecs, int, 0644); |
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MODULE_PARM_DESC(idle_poll_period_usecs, |
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"nvmet tcp io_work poll till idle time period in usecs"); |
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|
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#define NVMET_TCP_RECV_BUDGET 8 |
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#define NVMET_TCP_SEND_BUDGET 8 |
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#define NVMET_TCP_IO_WORK_BUDGET 64 |
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|
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enum nvmet_tcp_send_state { |
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NVMET_TCP_SEND_DATA_PDU, |
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NVMET_TCP_SEND_DATA, |
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NVMET_TCP_SEND_R2T, |
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NVMET_TCP_SEND_DDGST, |
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NVMET_TCP_SEND_RESPONSE |
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}; |
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|
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enum nvmet_tcp_recv_state { |
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NVMET_TCP_RECV_PDU, |
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NVMET_TCP_RECV_DATA, |
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NVMET_TCP_RECV_DDGST, |
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NVMET_TCP_RECV_ERR, |
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}; |
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enum { |
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NVMET_TCP_F_INIT_FAILED = (1 << 0), |
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}; |
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|
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struct nvmet_tcp_cmd { |
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struct nvmet_tcp_queue *queue; |
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struct nvmet_req req; |
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|
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struct nvme_tcp_cmd_pdu *cmd_pdu; |
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struct nvme_tcp_rsp_pdu *rsp_pdu; |
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struct nvme_tcp_data_pdu *data_pdu; |
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struct nvme_tcp_r2t_pdu *r2t_pdu; |
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|
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u32 rbytes_done; |
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u32 wbytes_done; |
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|
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u32 pdu_len; |
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u32 pdu_recv; |
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int sg_idx; |
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int nr_mapped; |
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struct msghdr recv_msg; |
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struct kvec *iov; |
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u32 flags; |
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|
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struct list_head entry; |
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struct llist_node lentry; |
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|
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/* send state */ |
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u32 offset; |
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struct scatterlist *cur_sg; |
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enum nvmet_tcp_send_state state; |
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|
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__le32 exp_ddgst; |
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__le32 recv_ddgst; |
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}; |
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|
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enum nvmet_tcp_queue_state { |
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NVMET_TCP_Q_CONNECTING, |
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NVMET_TCP_Q_LIVE, |
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NVMET_TCP_Q_DISCONNECTING, |
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}; |
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struct nvmet_tcp_queue { |
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struct socket *sock; |
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struct nvmet_tcp_port *port; |
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struct work_struct io_work; |
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struct nvmet_cq nvme_cq; |
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struct nvmet_sq nvme_sq; |
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|
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/* send state */ |
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struct nvmet_tcp_cmd *cmds; |
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unsigned int nr_cmds; |
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struct list_head free_list; |
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struct llist_head resp_list; |
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struct list_head resp_send_list; |
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int send_list_len; |
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struct nvmet_tcp_cmd *snd_cmd; |
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|
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/* recv state */ |
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int offset; |
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int left; |
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enum nvmet_tcp_recv_state rcv_state; |
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struct nvmet_tcp_cmd *cmd; |
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union nvme_tcp_pdu pdu; |
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|
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/* digest state */ |
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bool hdr_digest; |
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bool data_digest; |
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struct ahash_request *snd_hash; |
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struct ahash_request *rcv_hash; |
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|
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unsigned long poll_end; |
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|
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spinlock_t state_lock; |
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enum nvmet_tcp_queue_state state; |
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|
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struct sockaddr_storage sockaddr; |
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struct sockaddr_storage sockaddr_peer; |
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struct work_struct release_work; |
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int idx; |
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struct list_head queue_list; |
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struct nvmet_tcp_cmd connect; |
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|
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struct page_frag_cache pf_cache; |
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|
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void (*data_ready)(struct sock *); |
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void (*state_change)(struct sock *); |
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void (*write_space)(struct sock *); |
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}; |
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struct nvmet_tcp_port { |
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struct socket *sock; |
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struct work_struct accept_work; |
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struct nvmet_port *nport; |
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struct sockaddr_storage addr; |
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void (*data_ready)(struct sock *); |
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}; |
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static DEFINE_IDA(nvmet_tcp_queue_ida); |
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static LIST_HEAD(nvmet_tcp_queue_list); |
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static DEFINE_MUTEX(nvmet_tcp_queue_mutex); |
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|
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static struct workqueue_struct *nvmet_tcp_wq; |
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static const struct nvmet_fabrics_ops nvmet_tcp_ops; |
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static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c); |
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static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd); |
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|
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static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue, |
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struct nvmet_tcp_cmd *cmd) |
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{ |
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if (unlikely(!queue->nr_cmds)) { |
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/* We didn't allocate cmds yet, send 0xffff */ |
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return USHRT_MAX; |
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} |
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|
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return cmd - queue->cmds; |
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} |
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|
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static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd) |
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{ |
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return nvme_is_write(cmd->req.cmd) && |
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cmd->rbytes_done < cmd->req.transfer_len; |
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} |
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|
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static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd) |
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{ |
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return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status; |
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} |
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static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd) |
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{ |
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return !nvme_is_write(cmd->req.cmd) && |
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cmd->req.transfer_len > 0 && |
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!cmd->req.cqe->status; |
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} |
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static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd) |
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{ |
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return nvme_is_write(cmd->req.cmd) && cmd->pdu_len && |
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!cmd->rbytes_done; |
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} |
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|
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static inline struct nvmet_tcp_cmd * |
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nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue) |
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{ |
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struct nvmet_tcp_cmd *cmd; |
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|
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cmd = list_first_entry_or_null(&queue->free_list, |
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struct nvmet_tcp_cmd, entry); |
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if (!cmd) |
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return NULL; |
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list_del_init(&cmd->entry); |
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|
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cmd->rbytes_done = cmd->wbytes_done = 0; |
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cmd->pdu_len = 0; |
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cmd->pdu_recv = 0; |
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cmd->iov = NULL; |
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cmd->flags = 0; |
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return cmd; |
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} |
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|
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static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd) |
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{ |
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if (unlikely(cmd == &cmd->queue->connect)) |
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return; |
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list_add_tail(&cmd->entry, &cmd->queue->free_list); |
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} |
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static inline int queue_cpu(struct nvmet_tcp_queue *queue) |
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{ |
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return queue->sock->sk->sk_incoming_cpu; |
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} |
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static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue) |
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{ |
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return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0; |
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} |
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|
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static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue) |
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{ |
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return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0; |
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} |
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static inline void nvmet_tcp_hdgst(struct ahash_request *hash, |
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void *pdu, size_t len) |
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{ |
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struct scatterlist sg; |
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sg_init_one(&sg, pdu, len); |
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ahash_request_set_crypt(hash, &sg, pdu + len, len); |
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crypto_ahash_digest(hash); |
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} |
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|
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static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue, |
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void *pdu, size_t len) |
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{ |
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struct nvme_tcp_hdr *hdr = pdu; |
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__le32 recv_digest; |
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__le32 exp_digest; |
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|
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if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) { |
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pr_err("queue %d: header digest enabled but no header digest\n", |
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queue->idx); |
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return -EPROTO; |
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} |
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recv_digest = *(__le32 *)(pdu + hdr->hlen); |
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nvmet_tcp_hdgst(queue->rcv_hash, pdu, len); |
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exp_digest = *(__le32 *)(pdu + hdr->hlen); |
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if (recv_digest != exp_digest) { |
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pr_err("queue %d: header digest error: recv %#x expected %#x\n", |
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queue->idx, le32_to_cpu(recv_digest), |
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le32_to_cpu(exp_digest)); |
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return -EPROTO; |
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} |
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return 0; |
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} |
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static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu) |
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{ |
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struct nvme_tcp_hdr *hdr = pdu; |
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u8 digest_len = nvmet_tcp_hdgst_len(queue); |
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u32 len; |
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len = le32_to_cpu(hdr->plen) - hdr->hlen - |
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(hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0); |
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if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) { |
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pr_err("queue %d: data digest flag is cleared\n", queue->idx); |
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return -EPROTO; |
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} |
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return 0; |
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} |
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static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct scatterlist *sg; |
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int i; |
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sg = &cmd->req.sg[cmd->sg_idx]; |
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for (i = 0; i < cmd->nr_mapped; i++) |
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kunmap(sg_page(&sg[i])); |
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} |
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static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct kvec *iov = cmd->iov; |
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struct scatterlist *sg; |
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u32 length, offset, sg_offset; |
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length = cmd->pdu_len; |
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cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE); |
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offset = cmd->rbytes_done; |
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cmd->sg_idx = offset / PAGE_SIZE; |
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sg_offset = offset % PAGE_SIZE; |
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sg = &cmd->req.sg[cmd->sg_idx]; |
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while (length) { |
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u32 iov_len = min_t(u32, length, sg->length - sg_offset); |
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iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset; |
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iov->iov_len = iov_len; |
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length -= iov_len; |
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sg = sg_next(sg); |
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iov++; |
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sg_offset = 0; |
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} |
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iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov, |
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cmd->nr_mapped, cmd->pdu_len); |
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} |
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static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue) |
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{ |
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queue->rcv_state = NVMET_TCP_RECV_ERR; |
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if (queue->nvme_sq.ctrl) |
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nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl); |
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else |
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kernel_sock_shutdown(queue->sock, SHUT_RDWR); |
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} |
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static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status) |
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{ |
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if (status == -EPIPE || status == -ECONNRESET) |
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kernel_sock_shutdown(queue->sock, SHUT_RDWR); |
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else |
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nvmet_tcp_fatal_error(queue); |
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} |
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|
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static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl; |
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u32 len = le32_to_cpu(sgl->length); |
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|
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if (!len) |
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return 0; |
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|
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if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) | |
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NVME_SGL_FMT_OFFSET)) { |
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if (!nvme_is_write(cmd->req.cmd)) |
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return NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
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|
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if (len > cmd->req.port->inline_data_size) |
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return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR; |
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cmd->pdu_len = len; |
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} |
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cmd->req.transfer_len += len; |
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|
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cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt); |
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if (!cmd->req.sg) |
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return NVME_SC_INTERNAL; |
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cmd->cur_sg = cmd->req.sg; |
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|
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if (nvmet_tcp_has_data_in(cmd)) { |
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cmd->iov = kmalloc_array(cmd->req.sg_cnt, |
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sizeof(*cmd->iov), GFP_KERNEL); |
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if (!cmd->iov) |
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goto err; |
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} |
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return 0; |
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err: |
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sgl_free(cmd->req.sg); |
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return NVME_SC_INTERNAL; |
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} |
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static void nvmet_tcp_send_ddgst(struct ahash_request *hash, |
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struct nvmet_tcp_cmd *cmd) |
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{ |
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ahash_request_set_crypt(hash, cmd->req.sg, |
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(void *)&cmd->exp_ddgst, cmd->req.transfer_len); |
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crypto_ahash_digest(hash); |
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} |
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static void nvmet_tcp_recv_ddgst(struct ahash_request *hash, |
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struct nvmet_tcp_cmd *cmd) |
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{ |
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struct scatterlist sg; |
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struct kvec *iov; |
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int i; |
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|
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crypto_ahash_init(hash); |
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for (i = 0, iov = cmd->iov; i < cmd->nr_mapped; i++, iov++) { |
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sg_init_one(&sg, iov->iov_base, iov->iov_len); |
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ahash_request_set_crypt(hash, &sg, NULL, iov->iov_len); |
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crypto_ahash_update(hash); |
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} |
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ahash_request_set_crypt(hash, NULL, (void *)&cmd->exp_ddgst, 0); |
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crypto_ahash_final(hash); |
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} |
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static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct nvme_tcp_data_pdu *pdu = cmd->data_pdu; |
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struct nvmet_tcp_queue *queue = cmd->queue; |
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u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
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u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue); |
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|
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cmd->offset = 0; |
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cmd->state = NVMET_TCP_SEND_DATA_PDU; |
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pdu->hdr.type = nvme_tcp_c2h_data; |
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pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ? |
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NVME_TCP_F_DATA_SUCCESS : 0); |
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pdu->hdr.hlen = sizeof(*pdu); |
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pdu->hdr.pdo = pdu->hdr.hlen + hdgst; |
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pdu->hdr.plen = |
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cpu_to_le32(pdu->hdr.hlen + hdgst + |
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cmd->req.transfer_len + ddgst); |
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pdu->command_id = cmd->req.cqe->command_id; |
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pdu->data_length = cpu_to_le32(cmd->req.transfer_len); |
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pdu->data_offset = cpu_to_le32(cmd->wbytes_done); |
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|
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if (queue->data_digest) { |
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pdu->hdr.flags |= NVME_TCP_F_DDGST; |
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nvmet_tcp_send_ddgst(queue->snd_hash, cmd); |
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} |
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|
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if (cmd->queue->hdr_digest) { |
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pdu->hdr.flags |= NVME_TCP_F_HDGST; |
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nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); |
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} |
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} |
|
|
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static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu; |
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struct nvmet_tcp_queue *queue = cmd->queue; |
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u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
|
|
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cmd->offset = 0; |
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cmd->state = NVMET_TCP_SEND_R2T; |
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|
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pdu->hdr.type = nvme_tcp_r2t; |
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pdu->hdr.flags = 0; |
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pdu->hdr.hlen = sizeof(*pdu); |
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pdu->hdr.pdo = 0; |
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pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst); |
|
|
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pdu->command_id = cmd->req.cmd->common.command_id; |
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pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd); |
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pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done); |
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pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done); |
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if (cmd->queue->hdr_digest) { |
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pdu->hdr.flags |= NVME_TCP_F_HDGST; |
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nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); |
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} |
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} |
|
|
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static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd) |
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{ |
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struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu; |
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struct nvmet_tcp_queue *queue = cmd->queue; |
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u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
|
|
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cmd->offset = 0; |
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cmd->state = NVMET_TCP_SEND_RESPONSE; |
|
|
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pdu->hdr.type = nvme_tcp_rsp; |
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pdu->hdr.flags = 0; |
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pdu->hdr.hlen = sizeof(*pdu); |
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pdu->hdr.pdo = 0; |
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pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst); |
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if (cmd->queue->hdr_digest) { |
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pdu->hdr.flags |= NVME_TCP_F_HDGST; |
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nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu)); |
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} |
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} |
|
|
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static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue) |
|
{ |
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struct llist_node *node; |
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struct nvmet_tcp_cmd *cmd; |
|
|
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for (node = llist_del_all(&queue->resp_list); node; node = node->next) { |
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cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry); |
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list_add(&cmd->entry, &queue->resp_send_list); |
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queue->send_list_len++; |
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} |
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} |
|
|
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static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue) |
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{ |
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queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list, |
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struct nvmet_tcp_cmd, entry); |
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if (!queue->snd_cmd) { |
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nvmet_tcp_process_resp_list(queue); |
|
queue->snd_cmd = |
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list_first_entry_or_null(&queue->resp_send_list, |
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struct nvmet_tcp_cmd, entry); |
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if (unlikely(!queue->snd_cmd)) |
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return NULL; |
|
} |
|
|
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list_del_init(&queue->snd_cmd->entry); |
|
queue->send_list_len--; |
|
|
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if (nvmet_tcp_need_data_out(queue->snd_cmd)) |
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nvmet_setup_c2h_data_pdu(queue->snd_cmd); |
|
else if (nvmet_tcp_need_data_in(queue->snd_cmd)) |
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nvmet_setup_r2t_pdu(queue->snd_cmd); |
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else |
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nvmet_setup_response_pdu(queue->snd_cmd); |
|
|
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return queue->snd_cmd; |
|
} |
|
|
|
static void nvmet_tcp_queue_response(struct nvmet_req *req) |
|
{ |
|
struct nvmet_tcp_cmd *cmd = |
|
container_of(req, struct nvmet_tcp_cmd, req); |
|
struct nvmet_tcp_queue *queue = cmd->queue; |
|
struct nvme_sgl_desc *sgl; |
|
u32 len; |
|
|
|
if (unlikely(cmd == queue->cmd)) { |
|
sgl = &cmd->req.cmd->common.dptr.sgl; |
|
len = le32_to_cpu(sgl->length); |
|
|
|
/* |
|
* Wait for inline data before processing the response. |
|
* Avoid using helpers, this might happen before |
|
* nvmet_req_init is completed. |
|
*/ |
|
if (queue->rcv_state == NVMET_TCP_RECV_PDU && |
|
len && len <= cmd->req.port->inline_data_size && |
|
nvme_is_write(cmd->req.cmd)) |
|
return; |
|
} |
|
|
|
llist_add(&cmd->lentry, &queue->resp_list); |
|
queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &cmd->queue->io_work); |
|
} |
|
|
|
static void nvmet_tcp_execute_request(struct nvmet_tcp_cmd *cmd) |
|
{ |
|
if (unlikely(cmd->flags & NVMET_TCP_F_INIT_FAILED)) |
|
nvmet_tcp_queue_response(&cmd->req); |
|
else |
|
cmd->req.execute(&cmd->req); |
|
} |
|
|
|
static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd) |
|
{ |
|
u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
|
int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst; |
|
int ret; |
|
|
|
ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu), |
|
offset_in_page(cmd->data_pdu) + cmd->offset, |
|
left, MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST); |
|
if (ret <= 0) |
|
return ret; |
|
|
|
cmd->offset += ret; |
|
left -= ret; |
|
|
|
if (left) |
|
return -EAGAIN; |
|
|
|
cmd->state = NVMET_TCP_SEND_DATA; |
|
cmd->offset = 0; |
|
return 1; |
|
} |
|
|
|
static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
|
{ |
|
struct nvmet_tcp_queue *queue = cmd->queue; |
|
int ret; |
|
|
|
while (cmd->cur_sg) { |
|
struct page *page = sg_page(cmd->cur_sg); |
|
u32 left = cmd->cur_sg->length - cmd->offset; |
|
int flags = MSG_DONTWAIT; |
|
|
|
if ((!last_in_batch && cmd->queue->send_list_len) || |
|
cmd->wbytes_done + left < cmd->req.transfer_len || |
|
queue->data_digest || !queue->nvme_sq.sqhd_disabled) |
|
flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST; |
|
|
|
ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset, |
|
left, flags); |
|
if (ret <= 0) |
|
return ret; |
|
|
|
cmd->offset += ret; |
|
cmd->wbytes_done += ret; |
|
|
|
/* Done with sg?*/ |
|
if (cmd->offset == cmd->cur_sg->length) { |
|
cmd->cur_sg = sg_next(cmd->cur_sg); |
|
cmd->offset = 0; |
|
} |
|
} |
|
|
|
if (queue->data_digest) { |
|
cmd->state = NVMET_TCP_SEND_DDGST; |
|
cmd->offset = 0; |
|
} else { |
|
if (queue->nvme_sq.sqhd_disabled) { |
|
cmd->queue->snd_cmd = NULL; |
|
nvmet_tcp_put_cmd(cmd); |
|
} else { |
|
nvmet_setup_response_pdu(cmd); |
|
} |
|
} |
|
|
|
if (queue->nvme_sq.sqhd_disabled) { |
|
kfree(cmd->iov); |
|
sgl_free(cmd->req.sg); |
|
} |
|
|
|
return 1; |
|
|
|
} |
|
|
|
static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd, |
|
bool last_in_batch) |
|
{ |
|
u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
|
int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst; |
|
int flags = MSG_DONTWAIT; |
|
int ret; |
|
|
|
if (!last_in_batch && cmd->queue->send_list_len) |
|
flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST; |
|
else |
|
flags |= MSG_EOR; |
|
|
|
ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu), |
|
offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags); |
|
if (ret <= 0) |
|
return ret; |
|
cmd->offset += ret; |
|
left -= ret; |
|
|
|
if (left) |
|
return -EAGAIN; |
|
|
|
kfree(cmd->iov); |
|
sgl_free(cmd->req.sg); |
|
cmd->queue->snd_cmd = NULL; |
|
nvmet_tcp_put_cmd(cmd); |
|
return 1; |
|
} |
|
|
|
static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
|
{ |
|
u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue); |
|
int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst; |
|
int flags = MSG_DONTWAIT; |
|
int ret; |
|
|
|
if (!last_in_batch && cmd->queue->send_list_len) |
|
flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST; |
|
else |
|
flags |= MSG_EOR; |
|
|
|
ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu), |
|
offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags); |
|
if (ret <= 0) |
|
return ret; |
|
cmd->offset += ret; |
|
left -= ret; |
|
|
|
if (left) |
|
return -EAGAIN; |
|
|
|
cmd->queue->snd_cmd = NULL; |
|
return 1; |
|
} |
|
|
|
static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
|
{ |
|
struct nvmet_tcp_queue *queue = cmd->queue; |
|
struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
|
struct kvec iov = { |
|
.iov_base = &cmd->exp_ddgst + cmd->offset, |
|
.iov_len = NVME_TCP_DIGEST_LENGTH - cmd->offset |
|
}; |
|
int ret; |
|
|
|
if (!last_in_batch && cmd->queue->send_list_len) |
|
msg.msg_flags |= MSG_MORE; |
|
else |
|
msg.msg_flags |= MSG_EOR; |
|
|
|
ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len); |
|
if (unlikely(ret <= 0)) |
|
return ret; |
|
|
|
cmd->offset += ret; |
|
|
|
if (queue->nvme_sq.sqhd_disabled) { |
|
cmd->queue->snd_cmd = NULL; |
|
nvmet_tcp_put_cmd(cmd); |
|
} else { |
|
nvmet_setup_response_pdu(cmd); |
|
} |
|
return 1; |
|
} |
|
|
|
static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue, |
|
bool last_in_batch) |
|
{ |
|
struct nvmet_tcp_cmd *cmd = queue->snd_cmd; |
|
int ret = 0; |
|
|
|
if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) { |
|
cmd = nvmet_tcp_fetch_cmd(queue); |
|
if (unlikely(!cmd)) |
|
return 0; |
|
} |
|
|
|
if (cmd->state == NVMET_TCP_SEND_DATA_PDU) { |
|
ret = nvmet_try_send_data_pdu(cmd); |
|
if (ret <= 0) |
|
goto done_send; |
|
} |
|
|
|
if (cmd->state == NVMET_TCP_SEND_DATA) { |
|
ret = nvmet_try_send_data(cmd, last_in_batch); |
|
if (ret <= 0) |
|
goto done_send; |
|
} |
|
|
|
if (cmd->state == NVMET_TCP_SEND_DDGST) { |
|
ret = nvmet_try_send_ddgst(cmd, last_in_batch); |
|
if (ret <= 0) |
|
goto done_send; |
|
} |
|
|
|
if (cmd->state == NVMET_TCP_SEND_R2T) { |
|
ret = nvmet_try_send_r2t(cmd, last_in_batch); |
|
if (ret <= 0) |
|
goto done_send; |
|
} |
|
|
|
if (cmd->state == NVMET_TCP_SEND_RESPONSE) |
|
ret = nvmet_try_send_response(cmd, last_in_batch); |
|
|
|
done_send: |
|
if (ret < 0) { |
|
if (ret == -EAGAIN) |
|
return 0; |
|
return ret; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue, |
|
int budget, int *sends) |
|
{ |
|
int i, ret = 0; |
|
|
|
for (i = 0; i < budget; i++) { |
|
ret = nvmet_tcp_try_send_one(queue, i == budget - 1); |
|
if (unlikely(ret < 0)) { |
|
nvmet_tcp_socket_error(queue, ret); |
|
goto done; |
|
} else if (ret == 0) { |
|
break; |
|
} |
|
(*sends)++; |
|
} |
|
done: |
|
return ret; |
|
} |
|
|
|
static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue) |
|
{ |
|
queue->offset = 0; |
|
queue->left = sizeof(struct nvme_tcp_hdr); |
|
queue->cmd = NULL; |
|
queue->rcv_state = NVMET_TCP_RECV_PDU; |
|
} |
|
|
|
static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash); |
|
|
|
ahash_request_free(queue->rcv_hash); |
|
ahash_request_free(queue->snd_hash); |
|
crypto_free_ahash(tfm); |
|
} |
|
|
|
static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct crypto_ahash *tfm; |
|
|
|
tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
|
if (IS_ERR(tfm)) |
|
return PTR_ERR(tfm); |
|
|
|
queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
|
if (!queue->snd_hash) |
|
goto free_tfm; |
|
ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL); |
|
|
|
queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
|
if (!queue->rcv_hash) |
|
goto free_snd_hash; |
|
ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL); |
|
|
|
return 0; |
|
free_snd_hash: |
|
ahash_request_free(queue->snd_hash); |
|
free_tfm: |
|
crypto_free_ahash(tfm); |
|
return -ENOMEM; |
|
} |
|
|
|
|
|
static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq; |
|
struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp; |
|
struct msghdr msg = {}; |
|
struct kvec iov; |
|
int ret; |
|
|
|
if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) { |
|
pr_err("bad nvme-tcp pdu length (%d)\n", |
|
le32_to_cpu(icreq->hdr.plen)); |
|
nvmet_tcp_fatal_error(queue); |
|
} |
|
|
|
if (icreq->pfv != NVME_TCP_PFV_1_0) { |
|
pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv); |
|
return -EPROTO; |
|
} |
|
|
|
if (icreq->hpda != 0) { |
|
pr_err("queue %d: unsupported hpda %d\n", queue->idx, |
|
icreq->hpda); |
|
return -EPROTO; |
|
} |
|
|
|
queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE); |
|
queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE); |
|
if (queue->hdr_digest || queue->data_digest) { |
|
ret = nvmet_tcp_alloc_crypto(queue); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
memset(icresp, 0, sizeof(*icresp)); |
|
icresp->hdr.type = nvme_tcp_icresp; |
|
icresp->hdr.hlen = sizeof(*icresp); |
|
icresp->hdr.pdo = 0; |
|
icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen); |
|
icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0); |
|
icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */ |
|
icresp->cpda = 0; |
|
if (queue->hdr_digest) |
|
icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE; |
|
if (queue->data_digest) |
|
icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE; |
|
|
|
iov.iov_base = icresp; |
|
iov.iov_len = sizeof(*icresp); |
|
ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len); |
|
if (ret < 0) |
|
goto free_crypto; |
|
|
|
queue->state = NVMET_TCP_Q_LIVE; |
|
nvmet_prepare_receive_pdu(queue); |
|
return 0; |
|
free_crypto: |
|
if (queue->hdr_digest || queue->data_digest) |
|
nvmet_tcp_free_crypto(queue); |
|
return ret; |
|
} |
|
|
|
static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue, |
|
struct nvmet_tcp_cmd *cmd, struct nvmet_req *req) |
|
{ |
|
size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length); |
|
int ret; |
|
|
|
if (!nvme_is_write(cmd->req.cmd) || |
|
data_len > cmd->req.port->inline_data_size) { |
|
nvmet_prepare_receive_pdu(queue); |
|
return; |
|
} |
|
|
|
ret = nvmet_tcp_map_data(cmd); |
|
if (unlikely(ret)) { |
|
pr_err("queue %d: failed to map data\n", queue->idx); |
|
nvmet_tcp_fatal_error(queue); |
|
return; |
|
} |
|
|
|
queue->rcv_state = NVMET_TCP_RECV_DATA; |
|
nvmet_tcp_map_pdu_iovec(cmd); |
|
cmd->flags |= NVMET_TCP_F_INIT_FAILED; |
|
} |
|
|
|
static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvme_tcp_data_pdu *data = &queue->pdu.data; |
|
struct nvmet_tcp_cmd *cmd; |
|
|
|
if (likely(queue->nr_cmds)) |
|
cmd = &queue->cmds[data->ttag]; |
|
else |
|
cmd = &queue->connect; |
|
|
|
if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) { |
|
pr_err("ttag %u unexpected data offset %u (expected %u)\n", |
|
data->ttag, le32_to_cpu(data->data_offset), |
|
cmd->rbytes_done); |
|
/* FIXME: use path and transport errors */ |
|
nvmet_req_complete(&cmd->req, |
|
NVME_SC_INVALID_FIELD | NVME_SC_DNR); |
|
return -EPROTO; |
|
} |
|
|
|
cmd->pdu_len = le32_to_cpu(data->data_length); |
|
cmd->pdu_recv = 0; |
|
nvmet_tcp_map_pdu_iovec(cmd); |
|
queue->cmd = cmd; |
|
queue->rcv_state = NVMET_TCP_RECV_DATA; |
|
|
|
return 0; |
|
} |
|
|
|
static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr; |
|
struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd; |
|
struct nvmet_req *req; |
|
int ret; |
|
|
|
if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) { |
|
if (hdr->type != nvme_tcp_icreq) { |
|
pr_err("unexpected pdu type (%d) before icreq\n", |
|
hdr->type); |
|
nvmet_tcp_fatal_error(queue); |
|
return -EPROTO; |
|
} |
|
return nvmet_tcp_handle_icreq(queue); |
|
} |
|
|
|
if (hdr->type == nvme_tcp_h2c_data) { |
|
ret = nvmet_tcp_handle_h2c_data_pdu(queue); |
|
if (unlikely(ret)) |
|
return ret; |
|
return 0; |
|
} |
|
|
|
queue->cmd = nvmet_tcp_get_cmd(queue); |
|
if (unlikely(!queue->cmd)) { |
|
/* This should never happen */ |
|
pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d", |
|
queue->idx, queue->nr_cmds, queue->send_list_len, |
|
nvme_cmd->common.opcode); |
|
nvmet_tcp_fatal_error(queue); |
|
return -ENOMEM; |
|
} |
|
|
|
req = &queue->cmd->req; |
|
memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd)); |
|
|
|
if (unlikely(!nvmet_req_init(req, &queue->nvme_cq, |
|
&queue->nvme_sq, &nvmet_tcp_ops))) { |
|
pr_err("failed cmd %p id %d opcode %d, data_len: %d\n", |
|
req->cmd, req->cmd->common.command_id, |
|
req->cmd->common.opcode, |
|
le32_to_cpu(req->cmd->common.dptr.sgl.length)); |
|
|
|
nvmet_tcp_handle_req_failure(queue, queue->cmd, req); |
|
return 0; |
|
} |
|
|
|
ret = nvmet_tcp_map_data(queue->cmd); |
|
if (unlikely(ret)) { |
|
pr_err("queue %d: failed to map data\n", queue->idx); |
|
if (nvmet_tcp_has_inline_data(queue->cmd)) |
|
nvmet_tcp_fatal_error(queue); |
|
else |
|
nvmet_req_complete(req, ret); |
|
ret = -EAGAIN; |
|
goto out; |
|
} |
|
|
|
if (nvmet_tcp_need_data_in(queue->cmd)) { |
|
if (nvmet_tcp_has_inline_data(queue->cmd)) { |
|
queue->rcv_state = NVMET_TCP_RECV_DATA; |
|
nvmet_tcp_map_pdu_iovec(queue->cmd); |
|
return 0; |
|
} |
|
/* send back R2T */ |
|
nvmet_tcp_queue_response(&queue->cmd->req); |
|
goto out; |
|
} |
|
|
|
queue->cmd->req.execute(&queue->cmd->req); |
|
out: |
|
nvmet_prepare_receive_pdu(queue); |
|
return ret; |
|
} |
|
|
|
static const u8 nvme_tcp_pdu_sizes[] = { |
|
[nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu), |
|
[nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu), |
|
[nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu), |
|
}; |
|
|
|
static inline u8 nvmet_tcp_pdu_size(u8 type) |
|
{ |
|
size_t idx = type; |
|
|
|
return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) && |
|
nvme_tcp_pdu_sizes[idx]) ? |
|
nvme_tcp_pdu_sizes[idx] : 0; |
|
} |
|
|
|
static inline bool nvmet_tcp_pdu_valid(u8 type) |
|
{ |
|
switch (type) { |
|
case nvme_tcp_icreq: |
|
case nvme_tcp_cmd: |
|
case nvme_tcp_h2c_data: |
|
/* fallthru */ |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr; |
|
int len; |
|
struct kvec iov; |
|
struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
|
|
|
recv: |
|
iov.iov_base = (void *)&queue->pdu + queue->offset; |
|
iov.iov_len = queue->left; |
|
len = kernel_recvmsg(queue->sock, &msg, &iov, 1, |
|
iov.iov_len, msg.msg_flags); |
|
if (unlikely(len < 0)) |
|
return len; |
|
|
|
queue->offset += len; |
|
queue->left -= len; |
|
if (queue->left) |
|
return -EAGAIN; |
|
|
|
if (queue->offset == sizeof(struct nvme_tcp_hdr)) { |
|
u8 hdgst = nvmet_tcp_hdgst_len(queue); |
|
|
|
if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) { |
|
pr_err("unexpected pdu type %d\n", hdr->type); |
|
nvmet_tcp_fatal_error(queue); |
|
return -EIO; |
|
} |
|
|
|
if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) { |
|
pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen); |
|
return -EIO; |
|
} |
|
|
|
queue->left = hdr->hlen - queue->offset + hdgst; |
|
goto recv; |
|
} |
|
|
|
if (queue->hdr_digest && |
|
nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) { |
|
nvmet_tcp_fatal_error(queue); /* fatal */ |
|
return -EPROTO; |
|
} |
|
|
|
if (queue->data_digest && |
|
nvmet_tcp_check_ddgst(queue, &queue->pdu)) { |
|
nvmet_tcp_fatal_error(queue); /* fatal */ |
|
return -EPROTO; |
|
} |
|
|
|
return nvmet_tcp_done_recv_pdu(queue); |
|
} |
|
|
|
static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd) |
|
{ |
|
struct nvmet_tcp_queue *queue = cmd->queue; |
|
|
|
nvmet_tcp_recv_ddgst(queue->rcv_hash, cmd); |
|
queue->offset = 0; |
|
queue->left = NVME_TCP_DIGEST_LENGTH; |
|
queue->rcv_state = NVMET_TCP_RECV_DDGST; |
|
} |
|
|
|
static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvmet_tcp_cmd *cmd = queue->cmd; |
|
int ret; |
|
|
|
while (msg_data_left(&cmd->recv_msg)) { |
|
ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg, |
|
cmd->recv_msg.msg_flags); |
|
if (ret <= 0) |
|
return ret; |
|
|
|
cmd->pdu_recv += ret; |
|
cmd->rbytes_done += ret; |
|
} |
|
|
|
nvmet_tcp_unmap_pdu_iovec(cmd); |
|
if (queue->data_digest) { |
|
nvmet_tcp_prep_recv_ddgst(cmd); |
|
return 0; |
|
} |
|
|
|
if (cmd->rbytes_done == cmd->req.transfer_len) |
|
nvmet_tcp_execute_request(cmd); |
|
|
|
nvmet_prepare_receive_pdu(queue); |
|
return 0; |
|
} |
|
|
|
static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvmet_tcp_cmd *cmd = queue->cmd; |
|
int ret; |
|
struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
|
struct kvec iov = { |
|
.iov_base = (void *)&cmd->recv_ddgst + queue->offset, |
|
.iov_len = queue->left |
|
}; |
|
|
|
ret = kernel_recvmsg(queue->sock, &msg, &iov, 1, |
|
iov.iov_len, msg.msg_flags); |
|
if (unlikely(ret < 0)) |
|
return ret; |
|
|
|
queue->offset += ret; |
|
queue->left -= ret; |
|
if (queue->left) |
|
return -EAGAIN; |
|
|
|
if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) { |
|
pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n", |
|
queue->idx, cmd->req.cmd->common.command_id, |
|
queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst), |
|
le32_to_cpu(cmd->exp_ddgst)); |
|
nvmet_tcp_finish_cmd(cmd); |
|
nvmet_tcp_fatal_error(queue); |
|
ret = -EPROTO; |
|
goto out; |
|
} |
|
|
|
if (cmd->rbytes_done == cmd->req.transfer_len) |
|
nvmet_tcp_execute_request(cmd); |
|
|
|
ret = 0; |
|
out: |
|
nvmet_prepare_receive_pdu(queue); |
|
return ret; |
|
} |
|
|
|
static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue) |
|
{ |
|
int result = 0; |
|
|
|
if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR)) |
|
return 0; |
|
|
|
if (queue->rcv_state == NVMET_TCP_RECV_PDU) { |
|
result = nvmet_tcp_try_recv_pdu(queue); |
|
if (result != 0) |
|
goto done_recv; |
|
} |
|
|
|
if (queue->rcv_state == NVMET_TCP_RECV_DATA) { |
|
result = nvmet_tcp_try_recv_data(queue); |
|
if (result != 0) |
|
goto done_recv; |
|
} |
|
|
|
if (queue->rcv_state == NVMET_TCP_RECV_DDGST) { |
|
result = nvmet_tcp_try_recv_ddgst(queue); |
|
if (result != 0) |
|
goto done_recv; |
|
} |
|
|
|
done_recv: |
|
if (result < 0) { |
|
if (result == -EAGAIN) |
|
return 0; |
|
return result; |
|
} |
|
return 1; |
|
} |
|
|
|
static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue, |
|
int budget, int *recvs) |
|
{ |
|
int i, ret = 0; |
|
|
|
for (i = 0; i < budget; i++) { |
|
ret = nvmet_tcp_try_recv_one(queue); |
|
if (unlikely(ret < 0)) { |
|
nvmet_tcp_socket_error(queue, ret); |
|
goto done; |
|
} else if (ret == 0) { |
|
break; |
|
} |
|
(*recvs)++; |
|
} |
|
done: |
|
return ret; |
|
} |
|
|
|
static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue) |
|
{ |
|
spin_lock(&queue->state_lock); |
|
if (queue->state != NVMET_TCP_Q_DISCONNECTING) { |
|
queue->state = NVMET_TCP_Q_DISCONNECTING; |
|
schedule_work(&queue->release_work); |
|
} |
|
spin_unlock(&queue->state_lock); |
|
} |
|
|
|
static inline void nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue *queue) |
|
{ |
|
queue->poll_end = jiffies + usecs_to_jiffies(idle_poll_period_usecs); |
|
} |
|
|
|
static bool nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue *queue, |
|
int ops) |
|
{ |
|
if (!idle_poll_period_usecs) |
|
return false; |
|
|
|
if (ops) |
|
nvmet_tcp_arm_queue_deadline(queue); |
|
|
|
return !time_after(jiffies, queue->poll_end); |
|
} |
|
|
|
static void nvmet_tcp_io_work(struct work_struct *w) |
|
{ |
|
struct nvmet_tcp_queue *queue = |
|
container_of(w, struct nvmet_tcp_queue, io_work); |
|
bool pending; |
|
int ret, ops = 0; |
|
|
|
do { |
|
pending = false; |
|
|
|
ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops); |
|
if (ret > 0) |
|
pending = true; |
|
else if (ret < 0) |
|
return; |
|
|
|
ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops); |
|
if (ret > 0) |
|
pending = true; |
|
else if (ret < 0) |
|
return; |
|
|
|
} while (pending && ops < NVMET_TCP_IO_WORK_BUDGET); |
|
|
|
/* |
|
* Requeue the worker if idle deadline period is in progress or any |
|
* ops activity was recorded during the do-while loop above. |
|
*/ |
|
if (nvmet_tcp_check_queue_deadline(queue, ops) || pending) |
|
queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work); |
|
} |
|
|
|
static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue, |
|
struct nvmet_tcp_cmd *c) |
|
{ |
|
u8 hdgst = nvmet_tcp_hdgst_len(queue); |
|
|
|
c->queue = queue; |
|
c->req.port = queue->port->nport; |
|
|
|
c->cmd_pdu = page_frag_alloc(&queue->pf_cache, |
|
sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
|
if (!c->cmd_pdu) |
|
return -ENOMEM; |
|
c->req.cmd = &c->cmd_pdu->cmd; |
|
|
|
c->rsp_pdu = page_frag_alloc(&queue->pf_cache, |
|
sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
|
if (!c->rsp_pdu) |
|
goto out_free_cmd; |
|
c->req.cqe = &c->rsp_pdu->cqe; |
|
|
|
c->data_pdu = page_frag_alloc(&queue->pf_cache, |
|
sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
|
if (!c->data_pdu) |
|
goto out_free_rsp; |
|
|
|
c->r2t_pdu = page_frag_alloc(&queue->pf_cache, |
|
sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
|
if (!c->r2t_pdu) |
|
goto out_free_data; |
|
|
|
c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
|
|
|
list_add_tail(&c->entry, &queue->free_list); |
|
|
|
return 0; |
|
out_free_data: |
|
page_frag_free(c->data_pdu); |
|
out_free_rsp: |
|
page_frag_free(c->rsp_pdu); |
|
out_free_cmd: |
|
page_frag_free(c->cmd_pdu); |
|
return -ENOMEM; |
|
} |
|
|
|
static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c) |
|
{ |
|
page_frag_free(c->r2t_pdu); |
|
page_frag_free(c->data_pdu); |
|
page_frag_free(c->rsp_pdu); |
|
page_frag_free(c->cmd_pdu); |
|
} |
|
|
|
static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvmet_tcp_cmd *cmds; |
|
int i, ret = -EINVAL, nr_cmds = queue->nr_cmds; |
|
|
|
cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL); |
|
if (!cmds) |
|
goto out; |
|
|
|
for (i = 0; i < nr_cmds; i++) { |
|
ret = nvmet_tcp_alloc_cmd(queue, cmds + i); |
|
if (ret) |
|
goto out_free; |
|
} |
|
|
|
queue->cmds = cmds; |
|
|
|
return 0; |
|
out_free: |
|
while (--i >= 0) |
|
nvmet_tcp_free_cmd(cmds + i); |
|
kfree(cmds); |
|
out: |
|
return ret; |
|
} |
|
|
|
static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvmet_tcp_cmd *cmds = queue->cmds; |
|
int i; |
|
|
|
for (i = 0; i < queue->nr_cmds; i++) |
|
nvmet_tcp_free_cmd(cmds + i); |
|
|
|
nvmet_tcp_free_cmd(&queue->connect); |
|
kfree(cmds); |
|
} |
|
|
|
static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct socket *sock = queue->sock; |
|
|
|
write_lock_bh(&sock->sk->sk_callback_lock); |
|
sock->sk->sk_data_ready = queue->data_ready; |
|
sock->sk->sk_state_change = queue->state_change; |
|
sock->sk->sk_write_space = queue->write_space; |
|
sock->sk->sk_user_data = NULL; |
|
write_unlock_bh(&sock->sk->sk_callback_lock); |
|
} |
|
|
|
static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd) |
|
{ |
|
nvmet_req_uninit(&cmd->req); |
|
nvmet_tcp_unmap_pdu_iovec(cmd); |
|
kfree(cmd->iov); |
|
sgl_free(cmd->req.sg); |
|
} |
|
|
|
static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct nvmet_tcp_cmd *cmd = queue->cmds; |
|
int i; |
|
|
|
for (i = 0; i < queue->nr_cmds; i++, cmd++) { |
|
if (nvmet_tcp_need_data_in(cmd)) |
|
nvmet_tcp_finish_cmd(cmd); |
|
} |
|
|
|
if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) { |
|
/* failed in connect */ |
|
nvmet_tcp_finish_cmd(&queue->connect); |
|
} |
|
} |
|
|
|
static void nvmet_tcp_release_queue_work(struct work_struct *w) |
|
{ |
|
struct nvmet_tcp_queue *queue = |
|
container_of(w, struct nvmet_tcp_queue, release_work); |
|
|
|
mutex_lock(&nvmet_tcp_queue_mutex); |
|
list_del_init(&queue->queue_list); |
|
mutex_unlock(&nvmet_tcp_queue_mutex); |
|
|
|
nvmet_tcp_restore_socket_callbacks(queue); |
|
flush_work(&queue->io_work); |
|
|
|
nvmet_tcp_uninit_data_in_cmds(queue); |
|
nvmet_sq_destroy(&queue->nvme_sq); |
|
cancel_work_sync(&queue->io_work); |
|
sock_release(queue->sock); |
|
nvmet_tcp_free_cmds(queue); |
|
if (queue->hdr_digest || queue->data_digest) |
|
nvmet_tcp_free_crypto(queue); |
|
ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx); |
|
|
|
kfree(queue); |
|
} |
|
|
|
static void nvmet_tcp_data_ready(struct sock *sk) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
|
|
read_lock_bh(&sk->sk_callback_lock); |
|
queue = sk->sk_user_data; |
|
if (likely(queue)) |
|
queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work); |
|
read_unlock_bh(&sk->sk_callback_lock); |
|
} |
|
|
|
static void nvmet_tcp_write_space(struct sock *sk) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
|
|
read_lock_bh(&sk->sk_callback_lock); |
|
queue = sk->sk_user_data; |
|
if (unlikely(!queue)) |
|
goto out; |
|
|
|
if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) { |
|
queue->write_space(sk); |
|
goto out; |
|
} |
|
|
|
if (sk_stream_is_writeable(sk)) { |
|
clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
|
queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work); |
|
} |
|
out: |
|
read_unlock_bh(&sk->sk_callback_lock); |
|
} |
|
|
|
static void nvmet_tcp_state_change(struct sock *sk) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
|
|
read_lock_bh(&sk->sk_callback_lock); |
|
queue = sk->sk_user_data; |
|
if (!queue) |
|
goto done; |
|
|
|
switch (sk->sk_state) { |
|
case TCP_FIN_WAIT1: |
|
case TCP_CLOSE_WAIT: |
|
case TCP_CLOSE: |
|
/* FALLTHRU */ |
|
nvmet_tcp_schedule_release_queue(queue); |
|
break; |
|
default: |
|
pr_warn("queue %d unhandled state %d\n", |
|
queue->idx, sk->sk_state); |
|
} |
|
done: |
|
read_unlock_bh(&sk->sk_callback_lock); |
|
} |
|
|
|
static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue) |
|
{ |
|
struct socket *sock = queue->sock; |
|
struct inet_sock *inet = inet_sk(sock->sk); |
|
int ret; |
|
|
|
ret = kernel_getsockname(sock, |
|
(struct sockaddr *)&queue->sockaddr); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = kernel_getpeername(sock, |
|
(struct sockaddr *)&queue->sockaddr_peer); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* |
|
* Cleanup whatever is sitting in the TCP transmit queue on socket |
|
* close. This is done to prevent stale data from being sent should |
|
* the network connection be restored before TCP times out. |
|
*/ |
|
sock_no_linger(sock->sk); |
|
|
|
if (so_priority > 0) |
|
sock_set_priority(sock->sk, so_priority); |
|
|
|
/* Set socket type of service */ |
|
if (inet->rcv_tos > 0) |
|
ip_sock_set_tos(sock->sk, inet->rcv_tos); |
|
|
|
ret = 0; |
|
write_lock_bh(&sock->sk->sk_callback_lock); |
|
if (sock->sk->sk_state != TCP_ESTABLISHED) { |
|
/* |
|
* If the socket is already closing, don't even start |
|
* consuming it |
|
*/ |
|
ret = -ENOTCONN; |
|
} else { |
|
sock->sk->sk_user_data = queue; |
|
queue->data_ready = sock->sk->sk_data_ready; |
|
sock->sk->sk_data_ready = nvmet_tcp_data_ready; |
|
queue->state_change = sock->sk->sk_state_change; |
|
sock->sk->sk_state_change = nvmet_tcp_state_change; |
|
queue->write_space = sock->sk->sk_write_space; |
|
sock->sk->sk_write_space = nvmet_tcp_write_space; |
|
if (idle_poll_period_usecs) |
|
nvmet_tcp_arm_queue_deadline(queue); |
|
queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work); |
|
} |
|
write_unlock_bh(&sock->sk->sk_callback_lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port, |
|
struct socket *newsock) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
int ret; |
|
|
|
queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
|
if (!queue) |
|
return -ENOMEM; |
|
|
|
INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work); |
|
INIT_WORK(&queue->io_work, nvmet_tcp_io_work); |
|
queue->sock = newsock; |
|
queue->port = port; |
|
queue->nr_cmds = 0; |
|
spin_lock_init(&queue->state_lock); |
|
queue->state = NVMET_TCP_Q_CONNECTING; |
|
INIT_LIST_HEAD(&queue->free_list); |
|
init_llist_head(&queue->resp_list); |
|
INIT_LIST_HEAD(&queue->resp_send_list); |
|
|
|
queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL); |
|
if (queue->idx < 0) { |
|
ret = queue->idx; |
|
goto out_free_queue; |
|
} |
|
|
|
ret = nvmet_tcp_alloc_cmd(queue, &queue->connect); |
|
if (ret) |
|
goto out_ida_remove; |
|
|
|
ret = nvmet_sq_init(&queue->nvme_sq); |
|
if (ret) |
|
goto out_free_connect; |
|
|
|
nvmet_prepare_receive_pdu(queue); |
|
|
|
mutex_lock(&nvmet_tcp_queue_mutex); |
|
list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list); |
|
mutex_unlock(&nvmet_tcp_queue_mutex); |
|
|
|
ret = nvmet_tcp_set_queue_sock(queue); |
|
if (ret) |
|
goto out_destroy_sq; |
|
|
|
return 0; |
|
out_destroy_sq: |
|
mutex_lock(&nvmet_tcp_queue_mutex); |
|
list_del_init(&queue->queue_list); |
|
mutex_unlock(&nvmet_tcp_queue_mutex); |
|
nvmet_sq_destroy(&queue->nvme_sq); |
|
out_free_connect: |
|
nvmet_tcp_free_cmd(&queue->connect); |
|
out_ida_remove: |
|
ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx); |
|
out_free_queue: |
|
kfree(queue); |
|
return ret; |
|
} |
|
|
|
static void nvmet_tcp_accept_work(struct work_struct *w) |
|
{ |
|
struct nvmet_tcp_port *port = |
|
container_of(w, struct nvmet_tcp_port, accept_work); |
|
struct socket *newsock; |
|
int ret; |
|
|
|
while (true) { |
|
ret = kernel_accept(port->sock, &newsock, O_NONBLOCK); |
|
if (ret < 0) { |
|
if (ret != -EAGAIN) |
|
pr_warn("failed to accept err=%d\n", ret); |
|
return; |
|
} |
|
ret = nvmet_tcp_alloc_queue(port, newsock); |
|
if (ret) { |
|
pr_err("failed to allocate queue\n"); |
|
sock_release(newsock); |
|
} |
|
} |
|
} |
|
|
|
static void nvmet_tcp_listen_data_ready(struct sock *sk) |
|
{ |
|
struct nvmet_tcp_port *port; |
|
|
|
read_lock_bh(&sk->sk_callback_lock); |
|
port = sk->sk_user_data; |
|
if (!port) |
|
goto out; |
|
|
|
if (sk->sk_state == TCP_LISTEN) |
|
schedule_work(&port->accept_work); |
|
out: |
|
read_unlock_bh(&sk->sk_callback_lock); |
|
} |
|
|
|
static int nvmet_tcp_add_port(struct nvmet_port *nport) |
|
{ |
|
struct nvmet_tcp_port *port; |
|
__kernel_sa_family_t af; |
|
int ret; |
|
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL); |
|
if (!port) |
|
return -ENOMEM; |
|
|
|
switch (nport->disc_addr.adrfam) { |
|
case NVMF_ADDR_FAMILY_IP4: |
|
af = AF_INET; |
|
break; |
|
case NVMF_ADDR_FAMILY_IP6: |
|
af = AF_INET6; |
|
break; |
|
default: |
|
pr_err("address family %d not supported\n", |
|
nport->disc_addr.adrfam); |
|
ret = -EINVAL; |
|
goto err_port; |
|
} |
|
|
|
ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr, |
|
nport->disc_addr.trsvcid, &port->addr); |
|
if (ret) { |
|
pr_err("malformed ip/port passed: %s:%s\n", |
|
nport->disc_addr.traddr, nport->disc_addr.trsvcid); |
|
goto err_port; |
|
} |
|
|
|
port->nport = nport; |
|
INIT_WORK(&port->accept_work, nvmet_tcp_accept_work); |
|
if (port->nport->inline_data_size < 0) |
|
port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE; |
|
|
|
ret = sock_create(port->addr.ss_family, SOCK_STREAM, |
|
IPPROTO_TCP, &port->sock); |
|
if (ret) { |
|
pr_err("failed to create a socket\n"); |
|
goto err_port; |
|
} |
|
|
|
port->sock->sk->sk_user_data = port; |
|
port->data_ready = port->sock->sk->sk_data_ready; |
|
port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready; |
|
sock_set_reuseaddr(port->sock->sk); |
|
tcp_sock_set_nodelay(port->sock->sk); |
|
if (so_priority > 0) |
|
sock_set_priority(port->sock->sk, so_priority); |
|
|
|
ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr, |
|
sizeof(port->addr)); |
|
if (ret) { |
|
pr_err("failed to bind port socket %d\n", ret); |
|
goto err_sock; |
|
} |
|
|
|
ret = kernel_listen(port->sock, 128); |
|
if (ret) { |
|
pr_err("failed to listen %d on port sock\n", ret); |
|
goto err_sock; |
|
} |
|
|
|
nport->priv = port; |
|
pr_info("enabling port %d (%pISpc)\n", |
|
le16_to_cpu(nport->disc_addr.portid), &port->addr); |
|
|
|
return 0; |
|
|
|
err_sock: |
|
sock_release(port->sock); |
|
err_port: |
|
kfree(port); |
|
return ret; |
|
} |
|
|
|
static void nvmet_tcp_remove_port(struct nvmet_port *nport) |
|
{ |
|
struct nvmet_tcp_port *port = nport->priv; |
|
|
|
write_lock_bh(&port->sock->sk->sk_callback_lock); |
|
port->sock->sk->sk_data_ready = port->data_ready; |
|
port->sock->sk->sk_user_data = NULL; |
|
write_unlock_bh(&port->sock->sk->sk_callback_lock); |
|
cancel_work_sync(&port->accept_work); |
|
|
|
sock_release(port->sock); |
|
kfree(port); |
|
} |
|
|
|
static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
|
|
mutex_lock(&nvmet_tcp_queue_mutex); |
|
list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list) |
|
if (queue->nvme_sq.ctrl == ctrl) |
|
kernel_sock_shutdown(queue->sock, SHUT_RDWR); |
|
mutex_unlock(&nvmet_tcp_queue_mutex); |
|
} |
|
|
|
static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq) |
|
{ |
|
struct nvmet_tcp_queue *queue = |
|
container_of(sq, struct nvmet_tcp_queue, nvme_sq); |
|
|
|
if (sq->qid == 0) { |
|
/* Let inflight controller teardown complete */ |
|
flush_scheduled_work(); |
|
} |
|
|
|
queue->nr_cmds = sq->size * 2; |
|
if (nvmet_tcp_alloc_cmds(queue)) |
|
return NVME_SC_INTERNAL; |
|
return 0; |
|
} |
|
|
|
static void nvmet_tcp_disc_port_addr(struct nvmet_req *req, |
|
struct nvmet_port *nport, char *traddr) |
|
{ |
|
struct nvmet_tcp_port *port = nport->priv; |
|
|
|
if (inet_addr_is_any((struct sockaddr *)&port->addr)) { |
|
struct nvmet_tcp_cmd *cmd = |
|
container_of(req, struct nvmet_tcp_cmd, req); |
|
struct nvmet_tcp_queue *queue = cmd->queue; |
|
|
|
sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr); |
|
} else { |
|
memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE); |
|
} |
|
} |
|
|
|
static const struct nvmet_fabrics_ops nvmet_tcp_ops = { |
|
.owner = THIS_MODULE, |
|
.type = NVMF_TRTYPE_TCP, |
|
.msdbd = 1, |
|
.add_port = nvmet_tcp_add_port, |
|
.remove_port = nvmet_tcp_remove_port, |
|
.queue_response = nvmet_tcp_queue_response, |
|
.delete_ctrl = nvmet_tcp_delete_ctrl, |
|
.install_queue = nvmet_tcp_install_queue, |
|
.disc_traddr = nvmet_tcp_disc_port_addr, |
|
}; |
|
|
|
static int __init nvmet_tcp_init(void) |
|
{ |
|
int ret; |
|
|
|
nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0); |
|
if (!nvmet_tcp_wq) |
|
return -ENOMEM; |
|
|
|
ret = nvmet_register_transport(&nvmet_tcp_ops); |
|
if (ret) |
|
goto err; |
|
|
|
return 0; |
|
err: |
|
destroy_workqueue(nvmet_tcp_wq); |
|
return ret; |
|
} |
|
|
|
static void __exit nvmet_tcp_exit(void) |
|
{ |
|
struct nvmet_tcp_queue *queue; |
|
|
|
nvmet_unregister_transport(&nvmet_tcp_ops); |
|
|
|
flush_scheduled_work(); |
|
mutex_lock(&nvmet_tcp_queue_mutex); |
|
list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list) |
|
kernel_sock_shutdown(queue->sock, SHUT_RDWR); |
|
mutex_unlock(&nvmet_tcp_queue_mutex); |
|
flush_scheduled_work(); |
|
|
|
destroy_workqueue(nvmet_tcp_wq); |
|
} |
|
|
|
module_init(nvmet_tcp_init); |
|
module_exit(nvmet_tcp_exit); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
|
|
|