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nvme-tcp: support C2HData with SUCCESS flag 

A C2HData PDU with the SUCCESS flag set indicates that the I/O was
completed by the controller successfully and means that a subsequent
completion response capsule PDU will be ommitted.

If we see this flag, fisrt we check that LAST_PDU flag is set as well,
and then we complete the request when the data transfer (and data digest
verification if its on) is done.

While we're at it, reuse a bit of code with nvme_fail_request.

Reported-by: Steve Blightman <steve.blightman@oracle.com>
Suggested-by: Oliver Smith-Denny <osmithde@cisco.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Oliver Smith-Denny <osmithde@cisco.com>
Tested-by: Oliver Smith-Denny <osmithde@cisco.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sagi Grimberg 2019-03-13 18:55:10 +01:00 committed by Jens Axboe
parent 005c674f70
commit 602d674ce9
1 changed files with 28 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/nvme/host/tcp.c
View File

@ -463,6 +463,15 @@ static int nvme_tcp_handle_c2h_data(struct nvme_tcp_queue *queue,
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;
}
@ -618,6 +627,14 @@ static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
return ret;
}
static inline void nvme_tcp_end_request(struct request *rq, __le16 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)
{
@ -685,6 +702,8 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
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);
nvme_tcp_init_recv_ctx(queue);
}
}
@ -695,6 +714,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
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;
@ -718,6 +738,13 @@ static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
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);
}
nvme_tcp_init_recv_ctx(queue);
return 0;
}
@ -815,10 +842,7 @@ static inline void nvme_tcp_done_send_req(struct nvme_tcp_queue *queue)
static void nvme_tcp_fail_request(struct nvme_tcp_request *req)
{
union nvme_result res = {};
nvme_end_request(blk_mq_rq_from_pdu(req),
cpu_to_le16(NVME_SC_DATA_XFER_ERROR), res);
nvme_tcp_end_request(blk_mq_rq_from_pdu(req), NVME_SC_DATA_XFER_ERROR);
}
static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)