Merge branch 'tcp_stream_alloc_skb'

Eric Dumazet says:

====================
tcp: tcp_stream_alloc_skb() changes

sk_stream_alloc_skb() is only used by TCP.

Rename it to tcp_stream_alloc_skb() and apply small
optimizations.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sock.h

@@ -2422,9 +2422,6 @@ static inline void sk_stream_moderate_sndbuf(struct sock *sk)
 	WRITE_ONCE(sk->sk_sndbuf, max_t(u32, val, SOCK_MIN_SNDBUF));
 }
 
-struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
-				    bool force_schedule);
-
 /**
  * sk_page_frag - return an appropriate page_frag
  * @sk: socket

include/net/tcp.h

@@ -337,6 +337,8 @@ void tcp_twsk_destructor(struct sock *sk);
 ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
 			struct pipe_inode_info *pipe, size_t len,
 			unsigned int flags);
+struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
+				     bool force_schedule);
 
 void tcp_enter_quickack_mode(struct sock *sk, unsigned int max_quickacks);
 static inline void tcp_dec_quickack_mode(struct sock *sk,

net/ipv4/tcp.c

@@ -856,18 +856,15 @@ ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos,
 }
 EXPORT_SYMBOL(tcp_splice_read);
 
-struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
+struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
 				     bool force_schedule)
 {
 	struct sk_buff *skb;
 
-	/* The TCP header must be at least 32-bit aligned.  */
-	size = ALIGN(size, 4);
-
 	if (unlikely(tcp_under_memory_pressure(sk)))
 		sk_mem_reclaim_partial(sk);
 
-	skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp);
+	skb = alloc_skb_fclone(size + MAX_TCP_HEADER, gfp);
 	if (likely(skb)) {
 		bool mem_scheduled;
 
@@ -878,7 +875,7 @@ struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
 			mem_scheduled = sk_wmem_schedule(sk, skb->truesize);
 		}
 		if (likely(mem_scheduled)) {
-			skb_reserve(skb, sk->sk_prot->max_header);
+			skb_reserve(skb, MAX_TCP_HEADER);
 			/*
 			 * Make sure that we have exactly size bytes
 			 * available to the caller, no more, no less.
@@ -960,7 +957,7 @@ static struct sk_buff *tcp_build_frag(struct sock *sk, int size_goal, int flags,
 		if (!sk_stream_memory_free(sk))
 			return NULL;
 
-		skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation,
+		skb = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation,
 					   tcp_rtx_and_write_queues_empty(sk));
 		if (!skb)
 			return NULL;
@@ -1289,7 +1286,7 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 					goto restart;
 			}
 			first_skb = tcp_rtx_and_write_queues_empty(sk);
-			skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation,
+			skb = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation,
 						   first_skb);
 			if (!skb)
 				goto wait_for_space;

net/ipv4/tcp_output.c

@@ -1564,7 +1564,7 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
 		return -ENOMEM;
 
 	/* Get a new skb... force flag on. */
-	buff = sk_stream_alloc_skb(sk, nsize, gfp, true);
+	buff = tcp_stream_alloc_skb(sk, nsize, gfp, true);
 	if (!buff)
 		return -ENOMEM; /* We'll just try again later. */
 	skb_copy_decrypted(buff, skb);
@@ -2121,7 +2121,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
 		return tcp_fragment(sk, TCP_FRAG_IN_WRITE_QUEUE,
 				    skb, len, mss_now, gfp);
 
-	buff = sk_stream_alloc_skb(sk, 0, gfp, true);
+	buff = tcp_stream_alloc_skb(sk, 0, gfp, true);
 	if (unlikely(!buff))
 		return -ENOMEM;
 	skb_copy_decrypted(buff, skb);
@@ -2388,7 +2388,7 @@ static int tcp_mtu_probe(struct sock *sk)
 		return -1;
 
 	/* We're allowed to probe.  Build it now. */
-	nskb = sk_stream_alloc_skb(sk, probe_size, GFP_ATOMIC, false);
+	nskb = tcp_stream_alloc_skb(sk, probe_size, GFP_ATOMIC, false);
 	if (!nskb)
 		return -1;
 	sk_wmem_queued_add(sk, nskb->truesize);
@@ -3754,7 +3754,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
 	/* limit to order-0 allocations */
 	space = min_t(size_t, space, SKB_MAX_HEAD(MAX_TCP_HEADER));
 
-	syn_data = sk_stream_alloc_skb(sk, space, sk->sk_allocation, false);
+	syn_data = tcp_stream_alloc_skb(sk, space, sk->sk_allocation, false);
 	if (!syn_data)
 		goto fallback;
 	syn_data->ip_summed = CHECKSUM_PARTIAL;
@@ -3835,7 +3835,7 @@ int tcp_connect(struct sock *sk)
 		return 0;
 	}
 
-	buff = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, true);
+	buff = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation, true);
 	if (unlikely(!buff))
 		return -ENOBUFS;