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- // SPDX-License-Identifier: GPL-2.0
- /*
- * NVMe over Fabrics TCP target.
- * Copyright (c) 2018 Lightbits Labs. All rights reserved.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/err.h>
- #include <linux/nvme-tcp.h>
- #include <net/sock.h>
- #include <net/tcp.h>
- #include <linux/inet.h>
- #include <linux/llist.h>
- #include <crypto/hash.h>
- #include "nvmet.h"
- #define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
- /* Define the socket priority to use for connections were it is desirable
- * that the NIC consider performing optimized packet processing or filtering.
- * A non-zero value being sufficient to indicate general consideration of any
- * possible optimization. Making it a module param allows for alternative
- * values that may be unique for some NIC implementations.
- */
- static int so_priority;
- module_param(so_priority, int, 0644);
- MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
- #define NVMET_TCP_RECV_BUDGET 8
- #define NVMET_TCP_SEND_BUDGET 8
- #define NVMET_TCP_IO_WORK_BUDGET 64
- enum nvmet_tcp_send_state {
- NVMET_TCP_SEND_DATA_PDU,
- NVMET_TCP_SEND_DATA,
- NVMET_TCP_SEND_R2T,
- NVMET_TCP_SEND_DDGST,
- NVMET_TCP_SEND_RESPONSE
- };
- enum nvmet_tcp_recv_state {
- NVMET_TCP_RECV_PDU,
- NVMET_TCP_RECV_DATA,
- NVMET_TCP_RECV_DDGST,
- NVMET_TCP_RECV_ERR,
- };
- enum {
- NVMET_TCP_F_INIT_FAILED = (1 << 0),
- };
- struct nvmet_tcp_cmd {
- struct nvmet_tcp_queue *queue;
- struct nvmet_req req;
- struct nvme_tcp_cmd_pdu *cmd_pdu;
- struct nvme_tcp_rsp_pdu *rsp_pdu;
- struct nvme_tcp_data_pdu *data_pdu;
- struct nvme_tcp_r2t_pdu *r2t_pdu;
- u32 rbytes_done;
- u32 wbytes_done;
- u32 pdu_len;
- u32 pdu_recv;
- int sg_idx;
- int nr_mapped;
- struct msghdr recv_msg;
- struct kvec *iov;
- u32 flags;
- struct list_head entry;
- struct llist_node lentry;
- /* send state */
- u32 offset;
- struct scatterlist *cur_sg;
- enum nvmet_tcp_send_state state;
- __le32 exp_ddgst;
- __le32 recv_ddgst;
- };
- enum nvmet_tcp_queue_state {
- NVMET_TCP_Q_CONNECTING,
- NVMET_TCP_Q_LIVE,
- NVMET_TCP_Q_DISCONNECTING,
- };
- struct nvmet_tcp_queue {
- struct socket *sock;
- struct nvmet_tcp_port *port;
- struct work_struct io_work;
- struct nvmet_cq nvme_cq;
- struct nvmet_sq nvme_sq;
- /* send state */
- struct nvmet_tcp_cmd *cmds;
- unsigned int nr_cmds;
- struct list_head free_list;
- struct llist_head resp_list;
- struct list_head resp_send_list;
- int send_list_len;
- struct nvmet_tcp_cmd *snd_cmd;
- /* recv state */
- int offset;
- int left;
- enum nvmet_tcp_recv_state rcv_state;
- struct nvmet_tcp_cmd *cmd;
- union nvme_tcp_pdu pdu;
- /* digest state */
- bool hdr_digest;
- bool data_digest;
- struct ahash_request *snd_hash;
- struct ahash_request *rcv_hash;
- spinlock_t state_lock;
- enum nvmet_tcp_queue_state state;
- struct sockaddr_storage sockaddr;
- struct sockaddr_storage sockaddr_peer;
- struct work_struct release_work;
- int idx;
- struct list_head queue_list;
- struct nvmet_tcp_cmd connect;
- struct page_frag_cache pf_cache;
- void (*data_ready)(struct sock *);
- void (*state_change)(struct sock *);
- void (*write_space)(struct sock *);
- };
- struct nvmet_tcp_port {
- struct socket *sock;
- struct work_struct accept_work;
- struct nvmet_port *nport;
- struct sockaddr_storage addr;
- void (*data_ready)(struct sock *);
- };
- static DEFINE_IDA(nvmet_tcp_queue_ida);
- static LIST_HEAD(nvmet_tcp_queue_list);
- static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
- static struct workqueue_struct *nvmet_tcp_wq;
- static const struct nvmet_fabrics_ops nvmet_tcp_ops;
- static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
- static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
- static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
- struct nvmet_tcp_cmd *cmd)
- {
- if (unlikely(!queue->nr_cmds)) {
- /* We didn't allocate cmds yet, send 0xffff */
- return USHRT_MAX;
- }
- return cmd - queue->cmds;
- }
- static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
- {
- return nvme_is_write(cmd->req.cmd) &&
- cmd->rbytes_done < cmd->req.transfer_len;
- }
- static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
- {
- return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
- }
- static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
- {
- return !nvme_is_write(cmd->req.cmd) &&
- cmd->req.transfer_len > 0 &&
- !cmd->req.cqe->status;
- }
- static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
- {
- return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
- !cmd->rbytes_done;
- }
- static inline struct nvmet_tcp_cmd *
- nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
- {
- struct nvmet_tcp_cmd *cmd;
- cmd = list_first_entry_or_null(&queue->free_list,
- struct nvmet_tcp_cmd, entry);
- if (!cmd)
- return NULL;
- list_del_init(&cmd->entry);
- cmd->rbytes_done = cmd->wbytes_done = 0;
- cmd->pdu_len = 0;
- cmd->pdu_recv = 0;
- cmd->iov = NULL;
- cmd->flags = 0;
- return cmd;
- }
- static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
- {
- if (unlikely(cmd == &cmd->queue->connect))
- return;
- list_add_tail(&cmd->entry, &cmd->queue->free_list);
- }
- static inline int queue_cpu(struct nvmet_tcp_queue *queue)
- {
- return queue->sock->sk->sk_incoming_cpu;
- }
- static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
- {
- return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
- }
- static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
- {
- return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
- }
- static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
- void *pdu, size_t len)
- {
- struct scatterlist sg;
- sg_init_one(&sg, pdu, len);
- ahash_request_set_crypt(hash, &sg, pdu + len, len);
- crypto_ahash_digest(hash);
- }
- static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
- void *pdu, size_t len)
- {
- struct nvme_tcp_hdr *hdr = pdu;
- __le32 recv_digest;
- __le32 exp_digest;
- if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
- pr_err("queue %d: header digest enabled but no header digest\n",
- queue->idx);
- return -EPROTO;
- }
- recv_digest = *(__le32 *)(pdu + hdr->hlen);
- nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
- exp_digest = *(__le32 *)(pdu + hdr->hlen);
- if (recv_digest != exp_digest) {
- pr_err("queue %d: header digest error: recv %#x expected %#x\n",
- queue->idx, le32_to_cpu(recv_digest),
- le32_to_cpu(exp_digest));
- return -EPROTO;
- }
- return 0;
- }
- static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
- {
- struct nvme_tcp_hdr *hdr = pdu;
- u8 digest_len = nvmet_tcp_hdgst_len(queue);
- u32 len;
- len = le32_to_cpu(hdr->plen) - hdr->hlen -
- (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
- if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
- pr_err("queue %d: data digest flag is cleared\n", queue->idx);
- return -EPROTO;
- }
- return 0;
- }
- static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
- {
- struct scatterlist *sg;
- int i;
- sg = &cmd->req.sg[cmd->sg_idx];
- for (i = 0; i < cmd->nr_mapped; i++)
- kunmap(sg_page(&sg[i]));
- }
- static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
- {
- struct kvec *iov = cmd->iov;
- struct scatterlist *sg;
- u32 length, offset, sg_offset;
- length = cmd->pdu_len;
- cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
- offset = cmd->rbytes_done;
- cmd->sg_idx = offset / PAGE_SIZE;
- sg_offset = offset % PAGE_SIZE;
- sg = &cmd->req.sg[cmd->sg_idx];
- while (length) {
- u32 iov_len = min_t(u32, length, sg->length - sg_offset);
- iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
- iov->iov_len = iov_len;
- length -= iov_len;
- sg = sg_next(sg);
- iov++;
- sg_offset = 0;
- }
- iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
- cmd->nr_mapped, cmd->pdu_len);
- }
- static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
- {
- queue->rcv_state = NVMET_TCP_RECV_ERR;
- if (queue->nvme_sq.ctrl)
- nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
- else
- kernel_sock_shutdown(queue->sock, SHUT_RDWR);
- }
- static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
- {
- if (status == -EPIPE || status == -ECONNRESET)
- kernel_sock_shutdown(queue->sock, SHUT_RDWR);
- else
- nvmet_tcp_fatal_error(queue);
- }
- static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
- {
- struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
- u32 len = le32_to_cpu(sgl->length);
- if (!len)
- return 0;
- if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
- NVME_SGL_FMT_OFFSET)) {
- if (!nvme_is_write(cmd->req.cmd))
- return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
- if (len > cmd->req.port->inline_data_size)
- return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
- cmd->pdu_len = len;
- }
- cmd->req.transfer_len += len;
- cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
- if (!cmd->req.sg)
- return NVME_SC_INTERNAL;
- cmd->cur_sg = cmd->req.sg;
- if (nvmet_tcp_has_data_in(cmd)) {
- cmd->iov = kmalloc_array(cmd->req.sg_cnt,
- sizeof(*cmd->iov), GFP_KERNEL);
- if (!cmd->iov)
- goto err;
- }
- return 0;
- err:
- sgl_free(cmd->req.sg);
- return NVME_SC_INTERNAL;
- }
- static void nvmet_tcp_send_ddgst(struct ahash_request *hash,
- struct nvmet_tcp_cmd *cmd)
- {
- ahash_request_set_crypt(hash, cmd->req.sg,
- (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
- crypto_ahash_digest(hash);
- }
- static void nvmet_tcp_recv_ddgst(struct ahash_request *hash,
- struct nvmet_tcp_cmd *cmd)
- {
- struct scatterlist sg;
- struct kvec *iov;
- int i;
- crypto_ahash_init(hash);
- for (i = 0, iov = cmd->iov; i < cmd->nr_mapped; i++, iov++) {
- sg_init_one(&sg, iov->iov_base, iov->iov_len);
- ahash_request_set_crypt(hash, &sg, NULL, iov->iov_len);
- crypto_ahash_update(hash);
- }
- ahash_request_set_crypt(hash, NULL, (void *)&cmd->exp_ddgst, 0);
- crypto_ahash_final(hash);
- }
- static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
- {
- struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
- struct nvmet_tcp_queue *queue = cmd->queue;
- u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
- u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
- cmd->offset = 0;
- cmd->state = NVMET_TCP_SEND_DATA_PDU;
- pdu->hdr.type = nvme_tcp_c2h_data;
- pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
- NVME_TCP_F_DATA_SUCCESS : 0);
- pdu->hdr.hlen = sizeof(*pdu);
- pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
- pdu->hdr.plen =
- cpu_to_le32(pdu->hdr.hlen + hdgst +
- cmd->req.transfer_len + ddgst);
- pdu->command_id = cmd->req.cqe->command_id;
- pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
- pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
- if (queue->data_digest) {
- pdu->hdr.flags |= NVME_TCP_F_DDGST;
- nvmet_tcp_send_ddgst(queue->snd_hash, cmd);
- }
- if (cmd->queue->hdr_digest) {
- pdu->hdr.flags |= NVME_TCP_F_HDGST;
- nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
- }
- }
- static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
- {
- struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
- struct nvmet_tcp_queue *queue = cmd->queue;
- u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
- cmd->offset = 0;
- cmd->state = NVMET_TCP_SEND_R2T;
- pdu->hdr.type = nvme_tcp_r2t;
- pdu->hdr.flags = 0;
- pdu->hdr.hlen = sizeof(*pdu);
- pdu->hdr.pdo = 0;
- pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
- pdu->command_id = cmd->req.cmd->common.command_id;
- pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
- pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
- pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
- if (cmd->queue->hdr_digest) {
- pdu->hdr.flags |= NVME_TCP_F_HDGST;
- nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
- }
- }
- static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
- {
- struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
- struct nvmet_tcp_queue *queue = cmd->queue;
- u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
- cmd->offset = 0;
- cmd->state = NVMET_TCP_SEND_RESPONSE;
- pdu->hdr.type = nvme_tcp_rsp;
- pdu->hdr.flags = 0;
- pdu->hdr.hlen = sizeof(*pdu);
- pdu->hdr.pdo = 0;
- pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
- if (cmd->queue->hdr_digest) {
- pdu->hdr.flags |= NVME_TCP_F_HDGST;
- nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
- }
- }
- static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
- {
- struct llist_node *node;
- struct nvmet_tcp_cmd *cmd;
- for (node = llist_del_all(&queue->resp_list); node; node = node->next) {
- cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry);
- list_add(&cmd->entry, &queue->resp_send_list);
- queue->send_list_len++;
- }
- }
- static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
- {
- queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
- struct nvmet_tcp_cmd, entry);
- if (!queue->snd_cmd) {
- nvmet_tcp_process_resp_list(queue);
- queue->snd_cmd =
- list_first_entry_or_null(&queue->resp_send_list,
- struct nvmet_tcp_cmd, entry);
- if (unlikely(!queue->snd_cmd))
- return NULL;
- }
- list_del_init(&queue->snd_cmd->entry);
- queue->send_list_len--;
- if (nvmet_tcp_need_data_out(queue->snd_cmd))
- nvmet_setup_c2h_data_pdu(queue->snd_cmd);
- else if (nvmet_tcp_need_data_in(queue->snd_cmd))
- nvmet_setup_r2t_pdu(queue->snd_cmd);
- else
- nvmet_setup_response_pdu(queue->snd_cmd);
- 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;
- int left = NVME_TCP_DIGEST_LENGTH - cmd->offset;
- struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
- struct kvec iov = {
- .iov_base = (u8 *)&cmd->exp_ddgst + cmd->offset,
- .iov_len = left
- };
- 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;
- left -= ret;
- if (left)
- return -EAGAIN;
- 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, hdr->hlen)) {
- 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 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);
- /*
- * We exahusted our budget, requeue our selves
- */
- if (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 page *page;
- 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);
- page = virt_to_head_page(queue->pf_cache.va);
- __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
- 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;
- 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_destroy_port_queues(struct nvmet_tcp_port *port)
- {
- struct nvmet_tcp_queue *queue;
- mutex_lock(&nvmet_tcp_queue_mutex);
- list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
- if (queue->port == port)
- kernel_sock_shutdown(queue->sock, SHUT_RDWR);
- mutex_unlock(&nvmet_tcp_queue_mutex);
- }
- 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);
- /*
- * Destroy the remaining queues, which are not belong to any
- * controller yet.
- */
- nvmet_tcp_destroy_port_queues(port);
- 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 */
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