[PATCH net-next 03/10] hv_netvsc: Eliminate the channel field in hv_netvsc_packet structure

["K. Y. Srinivasan" <kys@microsoft.com>]

Eliminate the channel field in hv_netvsc_packet structure.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/net/hyperv/hyperv_net.h   |   22 ++++++++++++++++++----
 drivers/net/hyperv/netvsc.c       |   19 ++++++++-----------
 drivers/net/hyperv/netvsc_drv.c   |    5 +++--
 drivers/net/hyperv/rndis_filter.c |   10 ++++++----
 4 files changed, 35 insertions(+), 21 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 7435673..ac24091 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -144,7 +144,6 @@ struct hv_netvsc_packet {
 	u32 total_data_buflen;
 	u32 pad1;
 
-	struct vmbus_channel *channel;
 
 	u64 send_completion_tid;
 	void *send_completion_ctx;
@@ -199,7 +198,8 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
 void netvsc_xmit_completion(void *context);
 int netvsc_recv_callback(struct hv_device *device_obj,
 			struct hv_netvsc_packet *packet,
-			struct ndis_tcp_ip_checksum_info *csum_info);
+			struct ndis_tcp_ip_checksum_info *csum_info,
+			struct vmbus_channel *channel);
 void netvsc_channel_cb(void *context);
 int rndis_filter_open(struct hv_device *dev);
 int rndis_filter_close(struct hv_device *dev);
@@ -207,12 +207,12 @@ int rndis_filter_device_add(struct hv_device *dev,
 			void *additional_info);
 void rndis_filter_device_remove(struct hv_device *dev);
 int rndis_filter_receive(struct hv_device *dev,
-			struct hv_netvsc_packet *pkt);
+			struct hv_netvsc_packet *pkt,
+			struct vmbus_channel *channel);
 
 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter);
 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac);
 
-
 #define NVSP_INVALID_PROTOCOL_VERSION	((u32)0xFFFFFFFF)
 
 #define NVSP_PROTOCOL_VERSION_1		2
@@ -1262,5 +1262,19 @@ struct rndis_message {
 #define TRANSPORT_INFO_IPV6_TCP ((INFO_IPV6 << 16) | INFO_TCP)
 #define TRANSPORT_INFO_IPV6_UDP ((INFO_IPV6 << 16) | INFO_UDP)
 
+static inline struct vmbus_channel *get_channel(struct hv_netvsc_packet *packet,
+					struct netvsc_device *net_device)
+
+{
+	struct vmbus_channel *out_channel;
+
+	out_channel = net_device->chn_table[packet->q_idx];
+	if (!out_channel) {
+		out_channel = net_device->dev->channel;
+		packet->q_idx = 0;
+	}
+	return out_channel;
+}
+
 
 #endif /* _HYPERV_NET_H */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 51e4c0f..52533ed 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -610,6 +610,7 @@ static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
 }
 
 static void netvsc_send_completion(struct netvsc_device *net_device,
+				   struct vmbus_channel *incoming_channel,
 				   struct hv_device *device,
 				   struct vmpacket_descriptor *packet)
 {
@@ -651,7 +652,7 @@ static void netvsc_send_completion(struct netvsc_device *net_device,
 			if (send_index != NETVSC_INVALID_INDEX)
 				netvsc_free_send_slot(net_device, send_index);
 			q_idx = nvsc_packet->q_idx;
-			channel = nvsc_packet->channel;
+			channel = incoming_channel;
 			nvsc_packet->send_completion(nvsc_packet->
 						     send_completion_ctx);
 		}
@@ -748,7 +749,7 @@ static inline int netvsc_send_pkt(
 	struct netvsc_device *net_device)
 {
 	struct nvsp_message nvmsg;
-	struct vmbus_channel *out_channel = packet->channel;
+	struct vmbus_channel *out_channel = get_channel(packet, net_device);
 	u16 q_idx = packet->q_idx;
 	struct net_device *ndev = net_device->ndev;
 	u64 req_id;
@@ -857,13 +858,9 @@ int netvsc_send(struct hv_device *device,
 	if (!net_device)
 		return -ENODEV;
 
-	out_channel = net_device->chn_table[q_idx];
-	if (!out_channel) {
-		out_channel = device->channel;
-		q_idx = 0;
-		packet->q_idx = 0;
-	}
-	packet->channel = out_channel;
+	out_channel = get_channel(packet, net_device);
+	q_idx = packet->q_idx;
+
 	packet->send_buf_index = NETVSC_INVALID_INDEX;
 	packet->cp_partial = false;
 
@@ -1043,7 +1040,6 @@ static void netvsc_receive(struct netvsc_device *net_device,
 	}
 
 	count = vmxferpage_packet->range_cnt;
-	netvsc_packet->channel = channel;
 
 	/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
 	for (i = 0; i < count; i++) {
@@ -1055,7 +1051,7 @@ static void netvsc_receive(struct netvsc_device *net_device,
 					vmxferpage_packet->ranges[i].byte_count;
 
 		/* Pass it to the upper layer */
-		rndis_filter_receive(device, netvsc_packet);
+		rndis_filter_receive(device, netvsc_packet, channel);
 
 		if (netvsc_packet->status != NVSP_STAT_SUCCESS)
 			status = NVSP_STAT_FAIL;
@@ -1150,6 +1146,7 @@ void netvsc_channel_cb(void *context)
 				switch (desc->type) {
 				case VM_PKT_COMP:
 					netvsc_send_completion(net_device,
+								channel,
 								device, desc);
 					break;
 
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 409b48e..e5f4eec 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -686,7 +686,8 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
  */
 int netvsc_recv_callback(struct hv_device *device_obj,
 				struct hv_netvsc_packet *packet,
-				struct ndis_tcp_ip_checksum_info *csum_info)
+				struct ndis_tcp_ip_checksum_info *csum_info,
+				struct vmbus_channel *channel)
 {
 	struct net_device *net;
 	struct net_device_context *net_device_ctx;
@@ -732,7 +733,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 				       packet->vlan_tci);
 
-	skb_record_rx_queue(skb, packet->channel->
+	skb_record_rx_queue(skb, channel->
 			    offermsg.offer.sub_channel_index);
 
 	u64_stats_update_begin(&rx_stats->syncp);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 5931a79..1b04d78 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -350,7 +350,8 @@ static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 
 static void rndis_filter_receive_data(struct rndis_device *dev,
 				   struct rndis_message *msg,
-				   struct hv_netvsc_packet *pkt)
+				   struct hv_netvsc_packet *pkt,
+				   struct vmbus_channel *channel)
 {
 	struct rndis_packet *rndis_pkt;
 	u32 data_offset;
@@ -393,11 +394,12 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
 	}
 
 	csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
-	netvsc_recv_callback(dev->net_dev->dev, pkt, csum_info);
+	netvsc_recv_callback(dev->net_dev->dev, pkt, csum_info, channel);
 }
 
 int rndis_filter_receive(struct hv_device *dev,
-				struct hv_netvsc_packet	*pkt)
+				struct hv_netvsc_packet	*pkt,
+				struct vmbus_channel *channel)
 {
 	struct netvsc_device *net_dev = hv_get_drvdata(dev);
 	struct rndis_device *rndis_dev;
@@ -436,7 +438,7 @@ int rndis_filter_receive(struct hv_device *dev,
 	switch (rndis_msg->ndis_msg_type) {
 	case RNDIS_MSG_PACKET:
 		/* data msg */
-		rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
+		rndis_filter_receive_data(rndis_dev, rndis_msg, pkt, channel);
 		break;
 
 	case RNDIS_MSG_INIT_C:
-- 
1.7.4.1