[NET]: Add sk_stream_wmem_schedule

This patch introduces sk_stream_wmem_schedule as a short-hand for
the sk_forward_alloc checking on egress.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 6 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 312cb25cbd18..e51e626e9af1 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -709,6 +709,12 @@ static inline int sk_stream_rmem_schedule(struct sock *sk, struct sk_buff *skb)
                 sk_stream_mem_schedule(sk, skb->truesize, 1);
 }
 
+static inline int sk_stream_wmem_schedule(struct sock *sk, int size)
+{
+        return size <= sk->sk_forward_alloc ||
+               sk_stream_mem_schedule(sk, size, 0);
+}
+
 /* Used by processes to "lock" a socket state, so that
  * interrupts and bottom half handlers won't change it
  * from under us. It essentially blocks any incoming
@@ -1203,8 +1209,7 @@ static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
         skb = alloc_skb_fclone(size + hdr_len, gfp);
         if (skb) {
                 skb->truesize += mem;
-                if (sk->sk_forward_alloc >= (int)skb->truesize ||
-                    sk_stream_mem_schedule(sk, skb->truesize, 0)) {
+                if (sk_stream_wmem_schedule(sk, skb->truesize)) {
                         skb_reserve(skb, hdr_len);
                         return skb;
                 }
@@ -1227,8 +1232,7 @@ static inline struct page *sk_stream_alloc_page(struct sock *sk)
 {
         struct page *page = NULL;
 
-        if (sk->sk_forward_alloc >= (int)PAGE_SIZE ||
-            sk_stream_mem_schedule(sk, PAGE_SIZE, 0))
+        if (sk_stream_wmem_schedule(sk, PAGE_SIZE))
                 page = alloc_pages(sk->sk_allocation, 0);
         else {
                 sk->sk_prot->enter_memory_pressure();
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 02fdda68718d..854f6d0c4bb3 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -552,8 +552,7 @@ new_segment:
                         tcp_mark_push(tp, skb);
                         goto new_segment;
                 }
-                if (sk->sk_forward_alloc < copy &&
-                    !sk_stream_mem_schedule(sk, copy, 0))
+                if (!sk_stream_wmem_schedule(sk, copy))
                         goto wait_for_memory;
                 
                 if (can_coalesce) {