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tcp.c
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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 a time period (in usecs) that io_work() shall sample an activated
* queue before determining it to be idle. This optional module behavior
* can enable NIC solutions that support socket optimized packet processing
* using advanced interrupt moderation techniques.
*/
static int idle_poll_period_usecs;
module_param(idle_poll_period_usecs, int, 0644);
MODULE_PARM_DESC(idle_poll_period_usecs,
"nvmet tcp io_work poll till idle time period in usecs");
#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;
struct msghdr recv_msg;
struct bio_vec *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;
unsigned long poll_end;
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_free_cmd_buffers(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_free_cmd_buffers(struct nvmet_tcp_cmd *cmd)
{
kfree(cmd->iov);
sgl_free(cmd->req.sg);
cmd->iov = NULL;
cmd->req.sg = NULL;
}
static void nvmet_tcp_build_pdu_iovec(struct nvmet_tcp_cmd *cmd)
{
struct bio_vec *iov = cmd->iov;
struct scatterlist *sg;
u32 length, offset, sg_offset;
int nr_pages;
length = cmd->pdu_len;
nr_pages = 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->bv_page = sg_page(sg);
iov->bv_len = sg->length;
iov->bv_offset = sg->offset + sg_offset;
length -= iov_len;
sg = sg_next(sg);
iov++;
sg_offset = 0;
}
iov_iter_bvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
nr_pages, 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)
{
queue->rcv_state = NVMET_TCP_RECV_ERR;
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:
nvmet_tcp_free_cmd_buffers(cmd);
return NVME_SC_INTERNAL;
}
static void nvmet_tcp_calc_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_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_calc_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)
nvmet_tcp_free_cmd_buffers(cmd);
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;
nvmet_tcp_free_cmd_buffers(cmd);
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)
return ret; /* queue removal will cleanup */
queue->state = NVMET_TCP_Q_LIVE;
nvmet_prepare_receive_pdu(queue);
return 0;
}
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;
/*
* This command has not been processed yet, hence we are trying to
* figure out if there is still pending data left to receive. If
* we don't, we can simply prepare for the next pdu and bail out,
* otherwise we will need to prepare a buffer and receive the
* stale data before continuing forward.
*/
if (!nvme_is_write(cmd->req.cmd) || !data_len ||
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_build_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)) {
if (unlikely(data->ttag >= queue->nr_cmds)) {
pr_err("queue %d: received out of bound ttag %u, nr_cmds %u\n",
queue->idx, data->ttag, queue->nr_cmds);
nvmet_tcp_fatal_error(queue);
return -EPROTO;
}
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_build_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);