ipv4: gso: send_check() & segment() cleanups
inet_gso_segment() and inet_gso_send_check() are called by
skb_mac_gso_segment() under rcu lock, no need to use
rcu_read_lock() / rcu_read_unlock()
Avoid calling ip_hdr() twice per function.
We can use ip_send_check() helper.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 35913fb..4f8cd4f 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1254,20 +1254,19 @@
if (ihl < sizeof(*iph))
goto out;
+ proto = iph->protocol;
+
+ /* Warning: after this point, iph might be no longer valid */
if (unlikely(!pskb_may_pull(skb, ihl)))
goto out;
-
__skb_pull(skb, ihl);
+
skb_reset_transport_header(skb);
- iph = ip_hdr(skb);
- proto = iph->protocol;
err = -EPROTONOSUPPORT;
- rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (likely(ops && ops->callbacks.gso_send_check))
err = ops->callbacks.gso_send_check(skb);
- rcu_read_unlock();
out:
return err;
@@ -1305,23 +1304,23 @@
if (ihl < sizeof(*iph))
goto out;
+ id = ntohs(iph->id);
+ proto = iph->protocol;
+
+ /* Warning: after this point, iph might be no longer valid */
if (unlikely(!pskb_may_pull(skb, ihl)))
goto out;
+ __skb_pull(skb, ihl);
tunnel = !!skb->encapsulation;
- __skb_pull(skb, ihl);
skb_reset_transport_header(skb);
- iph = ip_hdr(skb);
- id = ntohs(iph->id);
- proto = iph->protocol;
+
segs = ERR_PTR(-EPROTONOSUPPORT);
- rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (likely(ops && ops->callbacks.gso_segment))
segs = ops->callbacks.gso_segment(skb, features);
- rcu_read_unlock();
if (IS_ERR_OR_NULL(segs))
goto out;
@@ -1339,8 +1338,7 @@
iph->id = htons(id++);
}
iph->tot_len = htons(skb->len - skb->mac_len);
- iph->check = 0;
- iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
+ ip_send_check(iph);
} while ((skb = skb->next));
out: