net: netif_rx() must disable preemption

Eric Paris reported netif_rx() is calling smp_processor_id() from
preemptible context, in particular when caller is
ip_dev_loopback_xmit().

RPS commit added this smp_processor_id() call, this patch makes sure
preemption is disabled. rps_get_cpus() wants rcu_read_lock() anyway, we
can dot it a bit earlier.

Reported-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 10 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 876b1112d5ba..e8041eb76ac1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2206,6 +2206,7 @@ DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
 /*
  * get_rps_cpu is called from netif_receive_skb and returns the target
  * CPU from the RPS map of the receiving queue for a given skb.
+ * rcu_read_lock must be held on entry.
  */
 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb)
 {
@@ -2217,8 +2218,6 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb)
         u8 ip_proto;
         u32 addr1, addr2, ports, ihl;
 
-        rcu_read_lock();
-
         if (skb_rx_queue_recorded(skb)) {
                 u16 index = skb_get_rx_queue(skb);
                 if (unlikely(index >= dev->num_rx_queues)) {
@@ -2296,7 +2295,6 @@ got_hash:
         }
 
 done:
-        rcu_read_unlock();
         return cpu;
 }
 
@@ -2392,7 +2390,7 @@ enqueue:
 
 int netif_rx(struct sk_buff *skb)
 {
-        int cpu;
+        int ret;
 
         /* if netpoll wants it, pretend we never saw it */
         if (netpoll_rx(skb))
@@ -2402,14 +2400,21 @@ int netif_rx(struct sk_buff *skb)
                 net_timestamp(skb);
 
 #ifdef CONFIG_RPS
-        cpu = get_rps_cpu(skb->dev, skb);
-        if (cpu < 0)
-                cpu = smp_processor_id();
+        {
+                int cpu;
+
+                rcu_read_lock();
+                cpu = get_rps_cpu(skb->dev, skb);
+                if (cpu < 0)
+                        cpu = smp_processor_id();
+                ret = enqueue_to_backlog(skb, cpu);
+                rcu_read_unlock();
+        }
 #else
-        cpu = smp_processor_id();
+        ret = enqueue_to_backlog(skb, get_cpu());
+        put_cpu();
 #endif
-
-        return enqueue_to_backlog(skb, cpu);
+        return ret;
 }
 EXPORT_SYMBOL(netif_rx);