From: Haiyang Zhang <haiyangz@microsoft.com>
Date: Thu, 22 Mar 2018 12:01:13 -0700
Patch-mainline: v4.17-rc1
Subject: hv_netvsc: Fix the return status in RX path
Git-commit: 5c71dadbb45970a8f0544a27ae8f1cbd9750e516
References: bsc#1107207

As defined in hyperv_net.h, the NVSP_STAT_SUCCESS is one not zero.
Some functions returns 0 when it actually means NVSP_STAT_SUCCESS.
This patch fixes them.

In netvsc_receive(), it puts the last RNDIS packet's receive status
for all packets in a vmxferpage which may contain multiple RNDIS
packets.
This patch puts NVSP_STAT_FAIL in the receive completion if one of
the packets in a vmxferpage fails.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Olaf Hering <ohering@suse.de>
---
 drivers/net/hyperv/netvsc.c       | 8 ++++++--
 drivers/net/hyperv/netvsc_drv.c   | 2 +-
 drivers/net/hyperv/rndis_filter.c | 4 ++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1098,12 +1098,16 @@ static int netvsc_receive(struct net_device *ndev,
 		void *data = recv_buf
 			+ vmxferpage_packet->ranges[i].byte_offset;
 		u32 buflen = vmxferpage_packet->ranges[i].byte_count;
+		int ret;
 
 		trace_rndis_recv(ndev, q_idx, data);
 
 		/* Pass it to the upper layer */
-		status = rndis_filter_receive(ndev, net_device,
-					      channel, data, buflen);
+		ret = rndis_filter_receive(ndev, net_device,
+					   channel, data, buflen);
+
+		if (unlikely(ret != NVSP_STAT_SUCCESS))
+			status = NVSP_STAT_FAIL;
 	}
 
 	enq_receive_complete(ndev, net_device, q_idx,
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -831,7 +831,7 @@ int netvsc_recv_callback(struct net_device *net,
 	u64_stats_update_end(&rx_stats->syncp);
 
 	napi_gro_receive(&nvchan->napi, skb);
-	return 0;
+	return NVSP_STAT_SUCCESS;
 }
 
 static void netvsc_get_drvinfo(struct net_device *net,
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -437,10 +437,10 @@ int rndis_filter_receive(struct net_device *ndev,
 			"unhandled rndis message (type %u len %u)\n",
 			   rndis_msg->ndis_msg_type,
 			   rndis_msg->msg_len);
-		break;
+		return NVSP_STAT_FAIL;
 	}
 
-	return 0;
+	return NVSP_STAT_SUCCESS;
 }
 
 static int rndis_filter_query_device(struct rndis_device *dev,