![Sagi Grimberg](/assets/img/avatar_default.png)
The host may support it, but nothing prevents us from sending a single r2t at a time like we do anyways. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de>
1750 lines
41 KiB
C
1750 lines
41 KiB
C
// 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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#include "nvmet.h"
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#define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
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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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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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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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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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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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u32 rbytes_done;
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u32 wbytes_done;
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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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struct list_head entry;
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struct llist_node lentry;
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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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__le32 exp_ddgst;
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__le32 recv_ddgst;
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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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int cpu;
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struct nvmet_cq nvme_cq;
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struct nvmet_sq nvme_sq;
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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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/* 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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/* 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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spinlock_t state_lock;
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enum nvmet_tcp_queue_state state;
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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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struct page_frag_cache pf_cache;
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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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int last_cpu;
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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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static struct workqueue_struct *nvmet_tcp_wq;
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static 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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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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return cmd - queue->cmds;
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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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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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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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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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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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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 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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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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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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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 = DIV_ROUND_UP(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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}
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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 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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if (!cmd->req.data_len)
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return 0;
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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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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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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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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_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_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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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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if (queue->data_digest) {
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pdu->hdr.flags |= NVME_TCP_F_DDGST;
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nvmet_tcp_ddgst(queue->snd_hash, cmd);
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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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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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{
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struct llist_node *node;
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node = llist_del_all(&queue->resp_list);
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if (!node)
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return;
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while (node) {
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struct nvmet_tcp_cmd *cmd = llist_entry(node,
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struct nvmet_tcp_cmd, lentry);
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list_add(&cmd->entry, &queue->resp_send_list);
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node = node->next;
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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);
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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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}
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list_del_init(&queue->snd_cmd->entry);
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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);
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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;
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}
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|
|
|
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;
|
|
|
|
llist_add(&cmd->lentry, &queue->resp_list);
|
|
queue_work_on(cmd->queue->cpu, nvmet_tcp_wq, &cmd->queue->io_work);
|
|
}
|
|
|
|
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);
|
|
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)
|
|
{
|
|
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;
|
|
|
|
ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
|
|
left, MSG_DONTWAIT | MSG_MORE);
|
|
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;
|
|
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;
|
|
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)
|
|
{
|
|
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;
|
|
|
|
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);
|
|
if (ret <= 0)
|
|
goto done_send;
|
|
}
|
|
|
|
if (cmd->state == NVMET_TCP_SEND_DDGST) {
|
|
ret = nvmet_try_send_ddgst(cmd);
|
|
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 (ret <= 0)
|
|
break;
|
|
(*sends)++;
|
|
}
|
|
|
|
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(0xffff); /* FIXME: support r2t */
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
/* recover the expected data transfer length */
|
|
req->data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
|
|
|
|
if (!nvme_is_write(cmd->req.cmd) ||
|
|
req->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;
|
|
|
|
cmd = &queue->cmds[data->ttag];
|
|
|
|
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 -EAGAIN;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
nvmet_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_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 (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
|
|
cmd->rbytes_done == cmd->req.transfer_len) {
|
|
if (queue->data_digest) {
|
|
nvmet_tcp_prep_recv_ddgst(cmd);
|
|
return 0;
|
|
}
|
|
nvmet_req_execute(&cmd->req);
|
|
}
|
|
|
|
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->flags & NVMET_TCP_F_INIT_FAILED) &&
|
|
cmd->rbytes_done == cmd->req.transfer_len)
|
|
nvmet_req_execute(&cmd->req);
|
|
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 (ret <= 0)
|
|
break;
|
|
(*recvs)++;
|
|
}
|
|
|
|
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 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) {
|
|
if (ret == -EPIPE || ret == -ECONNRESET)
|
|
kernel_sock_shutdown(queue->sock, SHUT_RDWR);
|
|
else
|
|
nvmet_tcp_fatal_error(queue);
|
|
return;
|
|
}
|
|
|
|
ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
|
|
if (ret > 0) {
|
|
/* transmitted message/data */
|
|
pending = true;
|
|
} else if (ret < 0) {
|
|
if (ret == -EPIPE || ret == -ECONNRESET)
|
|
kernel_sock_shutdown(queue->sock, SHUT_RDWR);
|
|
else
|
|
nvmet_tcp_fatal_error(queue);
|
|
return;
|
|
}
|
|
|
|
} while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
|
|
|
|
/*
|
|
* We exahusted our budget, requeue our selves
|
|
*/
|
|
if (pending)
|
|
queue_work_on(queue->cpu, 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);
|
|
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, 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, 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;
|
|
|
|
write_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 */
|
|
sk->sk_user_data = NULL;
|
|
nvmet_tcp_schedule_release_queue(queue);
|
|
break;
|
|
default:
|
|
pr_warn("queue %d unhandled state %d\n",
|
|
queue->idx, sk->sk_state);
|
|
}
|
|
done:
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
|
|
{
|
|
struct socket *sock = queue->sock;
|
|
struct linger sol = { .l_onoff = 1, .l_linger = 0 };
|
|
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.
|
|
*/
|
|
ret = kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
|
|
(char *)&sol, sizeof(sol));
|
|
if (ret)
|
|
return ret;
|
|
|
|
write_lock_bh(&sock->sk->sk_callback_lock);
|
|
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;
|
|
write_unlock_bh(&sock->sk->sk_callback_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
port->last_cpu = cpumask_next_wrap(port->last_cpu,
|
|
cpu_online_mask, -1, false);
|
|
queue->cpu = port->last_cpu;
|
|
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;
|
|
|
|
queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
|
|
|
|
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 opt, 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;
|
|
port->last_cpu = -1;
|
|
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;
|
|
|
|
opt = 1;
|
|
ret = kernel_setsockopt(port->sock, IPPROTO_TCP,
|
|
TCP_NODELAY, (char *)&opt, sizeof(opt));
|
|
if (ret) {
|
|
pr_err("failed to set TCP_NODELAY sock opt %d\n", ret);
|
|
goto err_sock;
|
|
}
|
|
|
|
ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_REUSEADDR,
|
|
(char *)&opt, sizeof(opt));
|
|
if (ret) {
|
|
pr_err("failed to set SO_REUSEADDR sock opt %d\n", ret);
|
|
goto err_sock;
|
|
}
|
|
|
|
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 struct nvmet_fabrics_ops nvmet_tcp_ops = {
|
|
.owner = THIS_MODULE,
|
|
.type = NVMF_TRTYPE_TCP,
|
|
.msdbd = 1,
|
|
.has_keyed_sgls = 0,
|
|
.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 */
|