hyperv: Report actual status in receive completion packet

The existing code always reports NVSP_STAT_SUCCESS. This patch adds the
mechanism to report failure when it happens.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hyperv/hyperv_net.h

@@ -35,6 +35,7 @@ struct hv_netvsc_packet;
 /* Represent the xfer page packet which contains 1 or more netvsc packet */
 struct xferpage_packet {
 	struct list_head list_ent;
+	u32 status;
 
 	/* # of netvsc packets this xfer packet contains */
 	u32 count;
@@ -47,6 +48,7 @@ struct xferpage_packet {
 struct hv_netvsc_packet {
 	/* Bookkeeping stuff */
 	struct list_head list_ent;
+	u32 status;
 
 	struct hv_device *device;
 	bool is_data_pkt;

drivers/net/hyperv/netvsc.c

@@ -558,7 +558,7 @@ int netvsc_send(struct hv_device *device,
 }
 
 static void netvsc_send_recv_completion(struct hv_device *device,
-					u64 transaction_id)
+					u64 transaction_id, u32 status)
 {
 	struct nvsp_message recvcompMessage;
 	int retries = 0;
@@ -571,9 +571,7 @@ static void netvsc_send_recv_completion(struct hv_device *device,
 	recvcompMessage.hdr.msg_type =
 				NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
 
-	/* FIXME: Pass in the status */
-	recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
-		NVSP_STAT_SUCCESS;
+	recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
 
 retry_send_cmplt:
 	/* Send the completion */
@@ -613,6 +611,7 @@ static void netvsc_receive_completion(void *context)
 	bool fsend_receive_comp = false;
 	unsigned long flags;
 	struct net_device *ndev;
+	u32 status = NVSP_STAT_NONE;
 
 	/*
 	 * Even though it seems logical to do a GetOutboundNetDevice() here to
@@ -627,6 +626,9 @@ static void netvsc_receive_completion(void *context)
 	/* Overloading use of the lock. */
 	spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
 
+	if (packet->status != NVSP_STAT_SUCCESS)
+		packet->xfer_page_pkt->status = NVSP_STAT_FAIL;
+
 	packet->xfer_page_pkt->count--;
 
 	/*
@@ -636,6 +638,7 @@ static void netvsc_receive_completion(void *context)
 	if (packet->xfer_page_pkt->count == 0) {
 		fsend_receive_comp = true;
 		transaction_id = packet->completion.recv.recv_completion_tid;
+		status = packet->xfer_page_pkt->status;
 		list_add_tail(&packet->xfer_page_pkt->list_ent,
 			      &net_device->recv_pkt_list);
 
@@ -647,7 +650,7 @@ static void netvsc_receive_completion(void *context)
 
 	/* Send a receive completion for the xfer page packet */
 	if (fsend_receive_comp)
-		netvsc_send_recv_completion(device, transaction_id);
+		netvsc_send_recv_completion(device, transaction_id, status);
 
 }
 
@@ -736,14 +739,16 @@ static void netvsc_receive(struct hv_device *device,
 				       flags);
 
 		netvsc_send_recv_completion(device,
-					    vmxferpage_packet->d.trans_id);
+					    vmxferpage_packet->d.trans_id,
+					    NVSP_STAT_FAIL);
 
 		return;
 	}
 
 	/* Remove the 1st packet to represent the xfer page packet itself */
 	xferpage_packet = (struct xferpage_packet *)listHead.next;
 	list_del(&xferpage_packet->list_ent);
+	xferpage_packet->status = NVSP_STAT_SUCCESS;
 
 	/* This is how much we can satisfy */
 	xferpage_packet->count = count - 1;
@@ -760,6 +765,7 @@ static void netvsc_receive(struct hv_device *device,
 		list_del(&netvsc_packet->list_ent);
 
 		/* Initialize the netvsc packet */
+		netvsc_packet->status = NVSP_STAT_SUCCESS;
 		netvsc_packet->xfer_page_pkt = xferpage_packet;
 		netvsc_packet->completion.recv.recv_completion =
 					netvsc_receive_completion;

drivers/net/hyperv/netvsc_drv.c

@@ -265,13 +265,15 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 	if (!net) {
 		netdev_err(net, "got receive callback but net device"
 			" not initialized yet\n");
+		packet->status = NVSP_STAT_FAIL;
 		return 0;
 	}
 
 	/* Allocate a skb - TODO direct I/O to pages? */
 	skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 	if (unlikely(!skb)) {
 		++net->stats.rx_dropped;
+		packet->status = NVSP_STAT_FAIL;
 		return 0;
 	}
 

drivers/net/hyperv/rndis_filter.c

@@ -411,24 +411,29 @@ int rndis_filter_receive(struct hv_device *dev,
 	struct rndis_device *rndis_dev;
 	struct rndis_message *rndis_msg;
 	struct net_device *ndev;
+	int ret = 0;
 
-	if (!net_dev)
-		return -EINVAL;
+	if (!net_dev) {
+		ret = -EINVAL;
+		goto exit;
+	}
 
 	ndev = net_dev->ndev;
 
 	/* Make sure the rndis device state is initialized */
 	if (!net_dev->extension) {
 		netdev_err(ndev, "got rndis message but no rndis device - "
 			  "dropping this message!\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto exit;
 	}
 
 	rndis_dev = (struct rndis_device *)net_dev->extension;
 	if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 		netdev_err(ndev, "got rndis message but rndis device "
 			   "uninitialized...dropping this message!\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto exit;
 	}
 
 	rndis_msg = pkt->data;
@@ -460,7 +465,11 @@ int rndis_filter_receive(struct hv_device *dev,
 		break;
 	}
 
-	return 0;
+exit:
+	if (ret != 0)
+		pkt->status = NVSP_STAT_FAIL;
+
+	return ret;
 }
 
 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,