hv_netvsc: pass netvsc_device to receive callback

The netvsc_receive_callback function was using RCU to find the
appropriate underlying netvsc_device. Since calling function already
had that pointer, this was unnecessary.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 7e34eb5..b090d90 100644 (file)
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -202,6 +202,7 @@ int netvsc_send(struct net_device_context *ndc,
 void netvsc_linkstatus_callback(struct net_device *net,
                                struct rndis_message *resp);
 int netvsc_recv_callback(struct net_device *net,
+                        struct netvsc_device *nvdev,
                         struct vmbus_channel *channel,
                         void  *data, u32 len,
                         const struct ndis_tcp_ip_checksum_info *csum_info,

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 3997c2d..5ab8161 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -739,34 +739,26 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
  * "wire" on the specified device.
  */
 int netvsc_recv_callback(struct net_device *net,
+                        struct netvsc_device *net_device,
                         struct vmbus_channel *channel,
                         void  *data, u32 len,
                         const struct ndis_tcp_ip_checksum_info *csum_info,
                         const struct ndis_pkt_8021q_info *vlan)
 {
        struct net_device_context *net_device_ctx = netdev_priv(net);
-       struct netvsc_device *net_device;
        u16 q_idx = channel->offermsg.offer.sub_channel_index;
-       struct netvsc_channel *nvchan;
+       struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
        struct sk_buff *skb;
        struct netvsc_stats *rx_stats;
 
        if (net->reg_state != NETREG_REGISTERED)
                return NVSP_STAT_FAIL;
 
-       rcu_read_lock();
-       net_device = rcu_dereference(net_device_ctx->nvdev);
-       if (unlikely(!net_device))
-               goto drop;
-
-       nvchan = &net_device->chan_table[q_idx];
-
        /* Allocate a skb - TODO direct I/O to pages? */
        skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
                                    csum_info, vlan, data, len);
        if (unlikely(!skb)) {
                ++net_device_ctx->eth_stats.rx_no_memory;
-drop:
                rcu_read_unlock();
                return NVSP_STAT_FAIL;
        }
@@ -790,8 +782,6 @@ drop:
        u64_stats_update_end(&rx_stats->syncp);
 
        napi_gro_receive(&nvchan->napi, skb);
-       rcu_read_unlock();
-
        return 0;
 }
 

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 901838b..025110a 100644 (file)
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -352,6 +352,7 @@ static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 }
 
 static int rndis_filter_receive_data(struct net_device *ndev,
+                                    struct netvsc_device *nvdev,
                                     struct rndis_device *dev,
                                     struct rndis_message *msg,
                                     struct vmbus_channel *channel,
@@ -388,7 +389,8 @@ static int rndis_filter_receive_data(struct net_device *ndev,
         */
        data = (void *)((unsigned long)data + data_offset);
        csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
-       return netvsc_recv_callback(ndev, channel,
+
+       return netvsc_recv_callback(ndev, nvdev, channel,
                                    data, rndis_pkt->data_len,
                                    csum_info, vlan);
 }
@@ -420,7 +422,8 @@ int rndis_filter_receive(struct net_device *ndev,
 
        switch (rndis_msg->ndis_msg_type) {
        case RNDIS_MSG_PACKET:
-               return rndis_filter_receive_data(ndev, rndis_dev, rndis_msg,
+               return rndis_filter_receive_data(ndev, net_dev,
+                                                rndis_dev, rndis_msg,
                                                 channel, data, buflen);
        case RNDIS_MSG_INIT_C:
        case RNDIS_MSG_QUERY_C: