/
tcp.c
2473 lines (2074 loc) · 60.8 KB
/
tcp.c
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// SPDX-License-Identifier: GPL-2.0
/*
* NVMe over Fabrics TCP host.
* 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/blk-mq.h>
#include <crypto/hash.h>
#include <net/busy_poll.h>
#include "nvme.h"
#include "fabrics.h"
struct nvme_tcp_queue;
enum nvme_tcp_send_state {
NVME_TCP_SEND_CMD_PDU = 0,
NVME_TCP_SEND_H2C_PDU,
NVME_TCP_SEND_DATA,
NVME_TCP_SEND_DDGST,
};
struct nvme_tcp_request {
struct nvme_request req;
void *pdu;
struct nvme_tcp_queue *queue;
u32 data_len;
u32 pdu_len;
u32 pdu_sent;
u16 ttag;
struct list_head entry;
__le32 ddgst;
struct bio *curr_bio;
struct iov_iter iter;
/* send state */
size_t offset;
size_t data_sent;
enum nvme_tcp_send_state state;
};
enum nvme_tcp_queue_flags {
NVME_TCP_Q_ALLOCATED = 0,
NVME_TCP_Q_LIVE = 1,
};
enum nvme_tcp_recv_state {
NVME_TCP_RECV_PDU = 0,
NVME_TCP_RECV_DATA,
NVME_TCP_RECV_DDGST,
};
struct nvme_tcp_ctrl;
struct nvme_tcp_queue {
struct socket *sock;
struct work_struct io_work;
int io_cpu;
spinlock_t lock;
struct list_head send_list;
/* recv state */
void *pdu;
int pdu_remaining;
int pdu_offset;
size_t data_remaining;
size_t ddgst_remaining;
unsigned int nr_cqe;
/* send state */
struct nvme_tcp_request *request;
int queue_size;
size_t cmnd_capsule_len;
struct nvme_tcp_ctrl *ctrl;
unsigned long flags;
bool rd_enabled;
bool hdr_digest;
bool data_digest;
struct ahash_request *rcv_hash;
struct ahash_request *snd_hash;
__le32 exp_ddgst;
__le32 recv_ddgst;
struct page_frag_cache pf_cache;
void (*state_change)(struct sock *);
void (*data_ready)(struct sock *);
void (*write_space)(struct sock *);
};
struct nvme_tcp_ctrl {
/* read only in the hot path */
struct nvme_tcp_queue *queues;
struct blk_mq_tag_set tag_set;
/* other member variables */
struct list_head list;
struct blk_mq_tag_set admin_tag_set;
struct sockaddr_storage addr;
struct sockaddr_storage src_addr;
struct nvme_ctrl ctrl;
struct work_struct err_work;
struct delayed_work connect_work;
struct nvme_tcp_request async_req;
u32 io_queues[HCTX_MAX_TYPES];
};
static LIST_HEAD(nvme_tcp_ctrl_list);
static DEFINE_MUTEX(nvme_tcp_ctrl_mutex);
static struct workqueue_struct *nvme_tcp_wq;
static struct blk_mq_ops nvme_tcp_mq_ops;
static struct blk_mq_ops nvme_tcp_admin_mq_ops;
static inline struct nvme_tcp_ctrl *to_tcp_ctrl(struct nvme_ctrl *ctrl)
{
return container_of(ctrl, struct nvme_tcp_ctrl, ctrl);
}
static inline int nvme_tcp_queue_id(struct nvme_tcp_queue *queue)
{
return queue - queue->ctrl->queues;
}
static inline struct blk_mq_tags *nvme_tcp_tagset(struct nvme_tcp_queue *queue)
{
u32 queue_idx = nvme_tcp_queue_id(queue);
if (queue_idx == 0)
return queue->ctrl->admin_tag_set.tags[queue_idx];
return queue->ctrl->tag_set.tags[queue_idx - 1];
}
static inline u8 nvme_tcp_hdgst_len(struct nvme_tcp_queue *queue)
{
return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
}
static inline u8 nvme_tcp_ddgst_len(struct nvme_tcp_queue *queue)
{
return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
}
static inline size_t nvme_tcp_inline_data_size(struct nvme_tcp_queue *queue)
{
return queue->cmnd_capsule_len - sizeof(struct nvme_command);
}
static inline bool nvme_tcp_async_req(struct nvme_tcp_request *req)
{
return req == &req->queue->ctrl->async_req;
}
static inline bool nvme_tcp_has_inline_data(struct nvme_tcp_request *req)
{
struct request *rq;
if (unlikely(nvme_tcp_async_req(req)))
return false; /* async events don't have a request */
rq = blk_mq_rq_from_pdu(req);
return rq_data_dir(rq) == WRITE && req->data_len &&
req->data_len <= nvme_tcp_inline_data_size(req->queue);
}
static inline struct page *nvme_tcp_req_cur_page(struct nvme_tcp_request *req)
{
return req->iter.bvec->bv_page;
}
static inline size_t nvme_tcp_req_cur_offset(struct nvme_tcp_request *req)
{
return req->iter.bvec->bv_offset + req->iter.iov_offset;
}
static inline size_t nvme_tcp_req_cur_length(struct nvme_tcp_request *req)
{
return min_t(size_t, iov_iter_single_seg_count(&req->iter),
req->pdu_len - req->pdu_sent);
}
static inline size_t nvme_tcp_req_offset(struct nvme_tcp_request *req)
{
return req->iter.iov_offset;
}
static inline size_t nvme_tcp_pdu_data_left(struct nvme_tcp_request *req)
{
return rq_data_dir(blk_mq_rq_from_pdu(req)) == WRITE ?
req->pdu_len - req->pdu_sent : 0;
}
static inline size_t nvme_tcp_pdu_last_send(struct nvme_tcp_request *req,
int len)
{
return nvme_tcp_pdu_data_left(req) <= len;
}
static void nvme_tcp_init_iter(struct nvme_tcp_request *req,
unsigned int dir)
{
struct request *rq = blk_mq_rq_from_pdu(req);
struct bio_vec *vec;
unsigned int size;
int nsegs;
size_t offset;
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) {
vec = &rq->special_vec;
nsegs = 1;
size = blk_rq_payload_bytes(rq);
offset = 0;
} else {
struct bio *bio = req->curr_bio;
vec = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
nsegs = bio_segments(bio);
size = bio->bi_iter.bi_size;
offset = bio->bi_iter.bi_bvec_done;
}
iov_iter_bvec(&req->iter, dir, vec, nsegs, size);
req->iter.iov_offset = offset;
}
static inline void nvme_tcp_advance_req(struct nvme_tcp_request *req,
int len)
{
req->data_sent += len;
req->pdu_sent += len;
iov_iter_advance(&req->iter, len);
if (!iov_iter_count(&req->iter) &&
req->data_sent < req->data_len) {
req->curr_bio = req->curr_bio->bi_next;
nvme_tcp_init_iter(req, WRITE);
}
}
static inline void nvme_tcp_queue_request(struct nvme_tcp_request *req)
{
struct nvme_tcp_queue *queue = req->queue;
spin_lock(&queue->lock);
list_add_tail(&req->entry, &queue->send_list);
spin_unlock(&queue->lock);
queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
}
static inline struct nvme_tcp_request *
nvme_tcp_fetch_request(struct nvme_tcp_queue *queue)
{
struct nvme_tcp_request *req;
spin_lock(&queue->lock);
req = list_first_entry_or_null(&queue->send_list,
struct nvme_tcp_request, entry);
if (req)
list_del(&req->entry);
spin_unlock(&queue->lock);
return req;
}
static inline void nvme_tcp_ddgst_final(struct ahash_request *hash,
__le32 *dgst)
{
ahash_request_set_crypt(hash, NULL, (u8 *)dgst, 0);
crypto_ahash_final(hash);
}
static inline void nvme_tcp_ddgst_update(struct ahash_request *hash,
struct page *page, off_t off, size_t len)
{
struct scatterlist sg;
sg_init_marker(&sg, 1);
sg_set_page(&sg, page, len, off);
ahash_request_set_crypt(hash, &sg, NULL, len);
crypto_ahash_update(hash);
}
static inline void nvme_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 nvme_tcp_verify_hdgst(struct nvme_tcp_queue *queue,
void *pdu, size_t pdu_len)
{
struct nvme_tcp_hdr *hdr = pdu;
__le32 recv_digest;
__le32 exp_digest;
if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
dev_err(queue->ctrl->ctrl.device,
"queue %d: header digest flag is cleared\n",
nvme_tcp_queue_id(queue));
return -EPROTO;
}
recv_digest = *(__le32 *)(pdu + hdr->hlen);
nvme_tcp_hdgst(queue->rcv_hash, pdu, pdu_len);
exp_digest = *(__le32 *)(pdu + hdr->hlen);
if (recv_digest != exp_digest) {
dev_err(queue->ctrl->ctrl.device,
"header digest error: recv %#x expected %#x\n",
le32_to_cpu(recv_digest), le32_to_cpu(exp_digest));
return -EIO;
}
return 0;
}
static int nvme_tcp_check_ddgst(struct nvme_tcp_queue *queue, void *pdu)
{
struct nvme_tcp_hdr *hdr = pdu;
u8 digest_len = nvme_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))) {
dev_err(queue->ctrl->ctrl.device,
"queue %d: data digest flag is cleared\n",
nvme_tcp_queue_id(queue));
return -EPROTO;
}
crypto_ahash_init(queue->rcv_hash);
return 0;
}
static void nvme_tcp_exit_request(struct blk_mq_tag_set *set,
struct request *rq, unsigned int hctx_idx)
{
struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
page_frag_free(req->pdu);
}
static int nvme_tcp_init_request(struct blk_mq_tag_set *set,
struct request *rq, unsigned int hctx_idx,
unsigned int numa_node)
{
struct nvme_tcp_ctrl *ctrl = set->driver_data;
struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
struct nvme_tcp_queue *queue = &ctrl->queues[queue_idx];
u8 hdgst = nvme_tcp_hdgst_len(queue);
req->pdu = page_frag_alloc(&queue->pf_cache,
sizeof(struct nvme_tcp_cmd_pdu) + hdgst,
GFP_KERNEL | __GFP_ZERO);
if (!req->pdu)
return -ENOMEM;
req->queue = queue;
nvme_req(rq)->ctrl = &ctrl->ctrl;
return 0;
}
static int nvme_tcp_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
unsigned int hctx_idx)
{
struct nvme_tcp_ctrl *ctrl = data;
struct nvme_tcp_queue *queue = &ctrl->queues[hctx_idx + 1];
hctx->driver_data = queue;
return 0;
}
static int nvme_tcp_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
unsigned int hctx_idx)
{
struct nvme_tcp_ctrl *ctrl = data;
struct nvme_tcp_queue *queue = &ctrl->queues[0];
hctx->driver_data = queue;
return 0;
}
static enum nvme_tcp_recv_state
nvme_tcp_recv_state(struct nvme_tcp_queue *queue)
{
return (queue->pdu_remaining) ? NVME_TCP_RECV_PDU :
(queue->ddgst_remaining) ? NVME_TCP_RECV_DDGST :
NVME_TCP_RECV_DATA;
}
static void nvme_tcp_init_recv_ctx(struct nvme_tcp_queue *queue)
{
queue->pdu_remaining = sizeof(struct nvme_tcp_rsp_pdu) +
nvme_tcp_hdgst_len(queue);
queue->pdu_offset = 0;
queue->data_remaining = -1;
queue->ddgst_remaining = 0;
}
static void nvme_tcp_error_recovery(struct nvme_ctrl *ctrl)
{
if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
return;
dev_warn(ctrl->device, "starting error recovery\n");
queue_work(nvme_reset_wq, &to_tcp_ctrl(ctrl)->err_work);
}
static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue,
struct nvme_completion *cqe)
{
struct request *rq;
rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue), cqe->command_id);
if (!rq) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag 0x%x not found\n",
nvme_tcp_queue_id(queue), cqe->command_id);
nvme_tcp_error_recovery(&queue->ctrl->ctrl);
return -EINVAL;
}
nvme_end_request(rq, cqe->status, cqe->result);
queue->nr_cqe++;
return 0;
}
static int nvme_tcp_handle_c2h_data(struct nvme_tcp_queue *queue,
struct nvme_tcp_data_pdu *pdu)
{
struct request *rq;
rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue), pdu->command_id);
if (!rq) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag %#x not found\n",
nvme_tcp_queue_id(queue), pdu->command_id);
return -ENOENT;
}
if (!blk_rq_payload_bytes(rq)) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag %#x unexpected data\n",
nvme_tcp_queue_id(queue), rq->tag);
return -EIO;
}
queue->data_remaining = le32_to_cpu(pdu->data_length);
if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS &&
unlikely(!(pdu->hdr.flags & NVME_TCP_F_DATA_LAST))) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag %#x SUCCESS set but not last PDU\n",
nvme_tcp_queue_id(queue), rq->tag);
nvme_tcp_error_recovery(&queue->ctrl->ctrl);
return -EPROTO;
}
return 0;
}
static int nvme_tcp_handle_comp(struct nvme_tcp_queue *queue,
struct nvme_tcp_rsp_pdu *pdu)
{
struct nvme_completion *cqe = &pdu->cqe;
int ret = 0;
/*
* AEN requests are special as they don't time out and can
* survive any kind of queue freeze and often don't respond to
* aborts. We don't even bother to allocate a struct request
* for them but rather special case them here.
*/
if (unlikely(nvme_tcp_queue_id(queue) == 0 &&
cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH))
nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
&cqe->result);
else
ret = nvme_tcp_process_nvme_cqe(queue, cqe);
return ret;
}
static int nvme_tcp_setup_h2c_data_pdu(struct nvme_tcp_request *req,
struct nvme_tcp_r2t_pdu *pdu)
{
struct nvme_tcp_data_pdu *data = req->pdu;
struct nvme_tcp_queue *queue = req->queue;
struct request *rq = blk_mq_rq_from_pdu(req);
u8 hdgst = nvme_tcp_hdgst_len(queue);
u8 ddgst = nvme_tcp_ddgst_len(queue);
req->pdu_len = le32_to_cpu(pdu->r2t_length);
req->pdu_sent = 0;
if (unlikely(req->data_sent + req->pdu_len > req->data_len)) {
dev_err(queue->ctrl->ctrl.device,
"req %d r2t len %u exceeded data len %u (%zu sent)\n",
rq->tag, req->pdu_len, req->data_len,
req->data_sent);
return -EPROTO;
}
if (unlikely(le32_to_cpu(pdu->r2t_offset) < req->data_sent)) {
dev_err(queue->ctrl->ctrl.device,
"req %d unexpected r2t offset %u (expected %zu)\n",
rq->tag, le32_to_cpu(pdu->r2t_offset),
req->data_sent);
return -EPROTO;
}
memset(data, 0, sizeof(*data));
data->hdr.type = nvme_tcp_h2c_data;
data->hdr.flags = NVME_TCP_F_DATA_LAST;
if (queue->hdr_digest)
data->hdr.flags |= NVME_TCP_F_HDGST;
if (queue->data_digest)
data->hdr.flags |= NVME_TCP_F_DDGST;
data->hdr.hlen = sizeof(*data);
data->hdr.pdo = data->hdr.hlen + hdgst;
data->hdr.plen =
cpu_to_le32(data->hdr.hlen + hdgst + req->pdu_len + ddgst);
data->ttag = pdu->ttag;
data->command_id = rq->tag;
data->data_offset = cpu_to_le32(req->data_sent);
data->data_length = cpu_to_le32(req->pdu_len);
return 0;
}
static int nvme_tcp_handle_r2t(struct nvme_tcp_queue *queue,
struct nvme_tcp_r2t_pdu *pdu)
{
struct nvme_tcp_request *req;
struct request *rq;
int ret;
rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue), pdu->command_id);
if (!rq) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag %#x not found\n",
nvme_tcp_queue_id(queue), pdu->command_id);
return -ENOENT;
}
req = blk_mq_rq_to_pdu(rq);
ret = nvme_tcp_setup_h2c_data_pdu(req, pdu);
if (unlikely(ret))
return ret;
req->state = NVME_TCP_SEND_H2C_PDU;
req->offset = 0;
nvme_tcp_queue_request(req);
return 0;
}
static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
unsigned int *offset, size_t *len)
{
struct nvme_tcp_hdr *hdr;
char *pdu = queue->pdu;
size_t rcv_len = min_t(size_t, *len, queue->pdu_remaining);
int ret;
ret = skb_copy_bits(skb, *offset,
&pdu[queue->pdu_offset], rcv_len);
if (unlikely(ret))
return ret;
queue->pdu_remaining -= rcv_len;
queue->pdu_offset += rcv_len;
*offset += rcv_len;
*len -= rcv_len;
if (queue->pdu_remaining)
return 0;
hdr = queue->pdu;
if (queue->hdr_digest) {
ret = nvme_tcp_verify_hdgst(queue, queue->pdu, hdr->hlen);
if (unlikely(ret))
return ret;
}
if (queue->data_digest) {
ret = nvme_tcp_check_ddgst(queue, queue->pdu);
if (unlikely(ret))
return ret;
}
switch (hdr->type) {
case nvme_tcp_c2h_data:
return nvme_tcp_handle_c2h_data(queue, (void *)queue->pdu);
case nvme_tcp_rsp:
nvme_tcp_init_recv_ctx(queue);
return nvme_tcp_handle_comp(queue, (void *)queue->pdu);
case nvme_tcp_r2t:
nvme_tcp_init_recv_ctx(queue);
return nvme_tcp_handle_r2t(queue, (void *)queue->pdu);
default:
dev_err(queue->ctrl->ctrl.device,
"unsupported pdu type (%d)\n", hdr->type);
return -EINVAL;
}
}
static inline void nvme_tcp_end_request(struct request *rq, u16 status)
{
union nvme_result res = {};
nvme_end_request(rq, cpu_to_le16(status << 1), res);
}
static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
unsigned int *offset, size_t *len)
{
struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu;
struct nvme_tcp_request *req;
struct request *rq;
rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue), pdu->command_id);
if (!rq) {
dev_err(queue->ctrl->ctrl.device,
"queue %d tag %#x not found\n",
nvme_tcp_queue_id(queue), pdu->command_id);
return -ENOENT;
}
req = blk_mq_rq_to_pdu(rq);
while (true) {
int recv_len, ret;
recv_len = min_t(size_t, *len, queue->data_remaining);
if (!recv_len)
break;
if (!iov_iter_count(&req->iter)) {
req->curr_bio = req->curr_bio->bi_next;
/*
* If we don`t have any bios it means that controller
* sent more data than we requested, hence error
*/
if (!req->curr_bio) {
dev_err(queue->ctrl->ctrl.device,
"queue %d no space in request %#x",
nvme_tcp_queue_id(queue), rq->tag);
nvme_tcp_init_recv_ctx(queue);
return -EIO;
}
nvme_tcp_init_iter(req, READ);
}
/* we can read only from what is left in this bio */
recv_len = min_t(size_t, recv_len,
iov_iter_count(&req->iter));
if (queue->data_digest)
ret = skb_copy_and_hash_datagram_iter(skb, *offset,
&req->iter, recv_len, queue->rcv_hash);
else
ret = skb_copy_datagram_iter(skb, *offset,
&req->iter, recv_len);
if (ret) {
dev_err(queue->ctrl->ctrl.device,
"queue %d failed to copy request %#x data",
nvme_tcp_queue_id(queue), rq->tag);
return ret;
}
*len -= recv_len;
*offset += recv_len;
queue->data_remaining -= recv_len;
}
if (!queue->data_remaining) {
if (queue->data_digest) {
nvme_tcp_ddgst_final(queue->rcv_hash, &queue->exp_ddgst);
queue->ddgst_remaining = NVME_TCP_DIGEST_LENGTH;
} else {
if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
queue->nr_cqe++;
}
nvme_tcp_init_recv_ctx(queue);
}
}
return 0;
}
static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
struct sk_buff *skb, unsigned int *offset, size_t *len)
{
struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu;
char *ddgst = (char *)&queue->recv_ddgst;
size_t recv_len = min_t(size_t, *len, queue->ddgst_remaining);
off_t off = NVME_TCP_DIGEST_LENGTH - queue->ddgst_remaining;
int ret;
ret = skb_copy_bits(skb, *offset, &ddgst[off], recv_len);
if (unlikely(ret))
return ret;
queue->ddgst_remaining -= recv_len;
*offset += recv_len;
*len -= recv_len;
if (queue->ddgst_remaining)
return 0;
if (queue->recv_ddgst != queue->exp_ddgst) {
dev_err(queue->ctrl->ctrl.device,
"data digest error: recv %#x expected %#x\n",
le32_to_cpu(queue->recv_ddgst),
le32_to_cpu(queue->exp_ddgst));
return -EIO;
}
if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
struct request *rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue),
pdu->command_id);
nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
queue->nr_cqe++;
}
nvme_tcp_init_recv_ctx(queue);
return 0;
}
static int nvme_tcp_recv_skb(read_descriptor_t *desc, struct sk_buff *skb,
unsigned int offset, size_t len)
{
struct nvme_tcp_queue *queue = desc->arg.data;
size_t consumed = len;
int result;
while (len) {
switch (nvme_tcp_recv_state(queue)) {
case NVME_TCP_RECV_PDU:
result = nvme_tcp_recv_pdu(queue, skb, &offset, &len);
break;
case NVME_TCP_RECV_DATA:
result = nvme_tcp_recv_data(queue, skb, &offset, &len);
break;
case NVME_TCP_RECV_DDGST:
result = nvme_tcp_recv_ddgst(queue, skb, &offset, &len);
break;
default:
result = -EFAULT;
}
if (result) {
dev_err(queue->ctrl->ctrl.device,
"receive failed: %d\n", result);
queue->rd_enabled = false;
nvme_tcp_error_recovery(&queue->ctrl->ctrl);
return result;
}
}
return consumed;
}
static void nvme_tcp_data_ready(struct sock *sk)
{
struct nvme_tcp_queue *queue;
read_lock_bh(&sk->sk_callback_lock);
queue = sk->sk_user_data;
if (likely(queue && queue->rd_enabled))
queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
read_unlock_bh(&sk->sk_callback_lock);
}
static void nvme_tcp_write_space(struct sock *sk)
{
struct nvme_tcp_queue *queue;
read_lock_bh(&sk->sk_callback_lock);
queue = sk->sk_user_data;
if (likely(queue && sk_stream_is_writeable(sk))) {
clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
}
read_unlock_bh(&sk->sk_callback_lock);
}
static void nvme_tcp_state_change(struct sock *sk)
{
struct nvme_tcp_queue *queue;
read_lock(&sk->sk_callback_lock);
queue = sk->sk_user_data;
if (!queue)
goto done;
switch (sk->sk_state) {
case TCP_CLOSE:
case TCP_CLOSE_WAIT:
case TCP_LAST_ACK:
case TCP_FIN_WAIT1:
case TCP_FIN_WAIT2:
/* fallthrough */
nvme_tcp_error_recovery(&queue->ctrl->ctrl);
break;
default:
dev_info(queue->ctrl->ctrl.device,
"queue %d socket state %d\n",
nvme_tcp_queue_id(queue), sk->sk_state);
}
queue->state_change(sk);
done:
read_unlock(&sk->sk_callback_lock);
}
static inline void nvme_tcp_done_send_req(struct nvme_tcp_queue *queue)
{
queue->request = NULL;
}
static void nvme_tcp_fail_request(struct nvme_tcp_request *req)
{
nvme_tcp_end_request(blk_mq_rq_from_pdu(req), NVME_SC_HOST_PATH_ERROR);
}
static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
{
struct nvme_tcp_queue *queue = req->queue;
while (true) {
struct page *page = nvme_tcp_req_cur_page(req);
size_t offset = nvme_tcp_req_cur_offset(req);
size_t len = nvme_tcp_req_cur_length(req);
bool last = nvme_tcp_pdu_last_send(req, len);
int ret, flags = MSG_DONTWAIT;
if (last && !queue->data_digest)
flags |= MSG_EOR;
else
flags |= MSG_MORE;
if (sendpage_ok(page)) {
ret = kernel_sendpage(queue->sock, page, offset, len,
flags);
} else {
ret = sock_no_sendpage(queue->sock, page, offset, len,
flags);
}
if (ret <= 0)
return ret;
nvme_tcp_advance_req(req, ret);
if (queue->data_digest)
nvme_tcp_ddgst_update(queue->snd_hash, page,
offset, ret);
/* fully successful last write*/
if (last && ret == len) {
if (queue->data_digest) {
nvme_tcp_ddgst_final(queue->snd_hash,
&req->ddgst);
req->state = NVME_TCP_SEND_DDGST;
req->offset = 0;
} else {
nvme_tcp_done_send_req(queue);
}
return 1;
}
}
return -EAGAIN;
}
static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req)
{
struct nvme_tcp_queue *queue = req->queue;
struct nvme_tcp_cmd_pdu *pdu = req->pdu;
bool inline_data = nvme_tcp_has_inline_data(req);
int flags = MSG_DONTWAIT | (inline_data ? MSG_MORE : MSG_EOR);
u8 hdgst = nvme_tcp_hdgst_len(queue);
int len = sizeof(*pdu) + hdgst - req->offset;
int ret;
if (queue->hdr_digest && !req->offset)
nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
ret = kernel_sendpage(queue->sock, virt_to_page(pdu),
offset_in_page(pdu) + req->offset, len, flags);
if (unlikely(ret <= 0))
return ret;
len -= ret;
if (!len) {
if (inline_data) {
req->state = NVME_TCP_SEND_DATA;
if (queue->data_digest)
crypto_ahash_init(queue->snd_hash);
nvme_tcp_init_iter(req, WRITE);
} else {
nvme_tcp_done_send_req(queue);
}
return 1;
}
req->offset += ret;
return -EAGAIN;
}
static int nvme_tcp_try_send_data_pdu(struct nvme_tcp_request *req)
{
struct nvme_tcp_queue *queue = req->queue;
struct nvme_tcp_data_pdu *pdu = req->pdu;
u8 hdgst = nvme_tcp_hdgst_len(queue);
int len = sizeof(*pdu) - req->offset + hdgst;
int ret;
if (queue->hdr_digest && !req->offset)
nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
ret = kernel_sendpage(queue->sock, virt_to_page(pdu),
offset_in_page(pdu) + req->offset, len,
MSG_DONTWAIT | MSG_MORE);
if (unlikely(ret <= 0))
return ret;
len -= ret;
if (!len) {
req->state = NVME_TCP_SEND_DATA;
if (queue->data_digest)
crypto_ahash_init(queue->snd_hash);
if (!req->data_sent)
nvme_tcp_init_iter(req, WRITE);
return 1;
}
req->offset += ret;
return -EAGAIN;
}
static int nvme_tcp_try_send_ddgst(struct nvme_tcp_request *req)
{
struct nvme_tcp_queue *queue = req->queue;
int ret;
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR };
struct kvec iov = {
.iov_base = &req->ddgst + req->offset,
.iov_len = NVME_TCP_DIGEST_LENGTH - req->offset
};
ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
if (unlikely(ret <= 0))
return ret;
if (req->offset + ret == NVME_TCP_DIGEST_LENGTH) {
nvme_tcp_done_send_req(queue);
return 1;
}
req->offset += ret;
return -EAGAIN;
}
static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
{
struct nvme_tcp_request *req;
int ret = 1;
if (!queue->request) {
queue->request = nvme_tcp_fetch_request(queue);
if (!queue->request)
return 0;
}
req = queue->request;
if (req->state == NVME_TCP_SEND_CMD_PDU) {
ret = nvme_tcp_try_send_cmd_pdu(req);
if (ret <= 0)
goto done;
if (!nvme_tcp_has_inline_data(req))
return ret;