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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Long Li <longli@microsoft.com>,
        Steve French <smfrench@gmail.com>,
        Ronnie Sahlberg <lsahlber@redhat.com>
Subject: [PATCH 4.16 049/196] cifs: smbd: disconnect transport on RDMA errors
Date:   Sun, 22 Apr 2018 15:51:09 +0200
Message-Id: <20180422135106.622685140@linuxfoundation.org>
In-Reply-To: <20180422135104.278511750@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Long Li <longli@microsoft.com>

commit 21a4e14aaedbc85f203d37e56cb26235b22b43f6 upstream.

On RDMA errors, transport should disconnect the RDMA CM connection. This
will notify the upper layer, and it will attempt transport reconnect.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/smbdirect.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -862,6 +862,8 @@ static int smbd_post_send_negotiate_req(
 	ib_dma_unmap_single(info->id->device, request->sge[0].addr,
 		request->sge[0].length, DMA_TO_DEVICE);
 
+	smbd_disconnect_rdma_connection(info);
+
 dma_mapping_failed:
 	mempool_free(request, info->request_mempool);
 	return rc;
@@ -1061,6 +1063,7 @@ static int smbd_post_send(struct smbd_co
 			if (atomic_dec_and_test(&info->send_pending))
 				wake_up(&info->wait_send_pending);
 		}
+		smbd_disconnect_rdma_connection(info);
 	} else
 		/* Reset timer for idle connection after packet is sent */
 		mod_delayed_work(info->workqueue, &info->idle_timer_work,
@@ -1202,7 +1205,7 @@ static int smbd_post_recv(
 	if (rc) {
 		ib_dma_unmap_single(info->id->device, response->sge.addr,
 				    response->sge.length, DMA_FROM_DEVICE);
-
+		smbd_disconnect_rdma_connection(info);
 		log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc);
 	}
 
@@ -2546,6 +2549,8 @@ dma_map_error:
 	if (atomic_dec_and_test(&info->mr_used_count))
 		wake_up(&info->wait_for_mr_cleanup);
 
+	smbd_disconnect_rdma_connection(info);
+
 	return NULL;
 }