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>

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 208ee51..e7e0888 100644 (file)
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -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)