tcp: avoid order-1 allocations on wifi and tx path

[pandora-kernel.git] / net / ipv4 / tcp.c

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 22ef5f9..a5daa21 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -245,6 +245,8 @@
  *     TCP_CLOSE               socket is finished
  */
 
+#define pr_fmt(fmt) "TCP: " fmt
+
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/types.h>
@@ -699,11 +701,12 @@ struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp)
        skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp);
        if (skb) {
                if (sk_wmem_schedule(sk, skb->truesize)) {
+                       skb_reserve(skb, sk->sk_prot->max_header);
                        /*
                         * Make sure that we have exactly size bytes
                         * available to the caller, no more, no less.
                         */
-                       skb_reserve(skb, skb_tailroom(skb) - size);
+                       skb->avail_size = size;
                        return skb;
                }
                __kfree_skb(skb);
@@ -858,7 +861,7 @@ wait_for_memory:
        }
 
 out:
-       if (copied)
+       if (copied && !(flags & MSG_SENDPAGE_NOTLAST))
                tcp_push(sk, flags, mss_now, tp->nonagle);
        return copied;
 
@@ -993,10 +996,9 @@ new_segment:
                                copy = seglen;
 
                        /* Where to copy to? */
-                       if (skb_tailroom(skb) > 0) {
+                       if (skb_availroom(skb) > 0) {
                                /* We have some space in skb head. Superb! */
-                               if (copy > skb_tailroom(skb))
-                                       copy = skb_tailroom(skb);
+                               copy = min_t(int, copy, skb_availroom(skb));
                                err = skb_add_data_nocache(sk, skb, from, copy);
                                if (err)
                                        goto do_fault;
@@ -1675,7 +1677,8 @@ do_prequeue:
 
                                if (tp->ucopy.dma_cookie < 0) {
 
-                                       printk(KERN_ALERT "dma_cookie < 0\n");
+                                       pr_alert("%s: dma_cookie < 0\n",
+                                                __func__);
 
                                        /* Exception. Bailout! */
                                        if (!copied)
@@ -1884,9 +1887,9 @@ bool tcp_check_oom(struct sock *sk, int shift)
        out_of_socket_memory = tcp_out_of_memory(sk);
 
        if (too_many_orphans && net_ratelimit())
-               pr_info("TCP: too many orphaned sockets\n");
+               pr_info("too many orphaned sockets\n");
        if (out_of_socket_memory && net_ratelimit())
-               pr_info("TCP: out of memory -- consider tuning tcp_mem\n");
+               pr_info("out of memory -- consider tuning tcp_mem\n");
        return too_many_orphans || out_of_socket_memory;
 }
 
@@ -3299,8 +3302,7 @@ void __init tcp_init(void)
 
        tcp_init_mem(&init_net);
        /* Set per-socket limits to no more than 1/128 the pressure threshold */
-       limit = nr_free_buffer_pages() << (PAGE_SHIFT - 10);
-       limit = max(limit, 128UL);
+       limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7);
        max_share = min(4UL*1024*1024, limit);
 
        sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
@@ -3311,9 +3313,8 @@ void __init tcp_init(void)
        sysctl_tcp_rmem[1] = 87380;
        sysctl_tcp_rmem[2] = max(87380, max_share);
 
-       printk(KERN_INFO "TCP: Hash tables configured "
-              "(established %u bind %u)\n",
-              tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size);
+       pr_info("Hash tables configured (established %u bind %u)\n",
+               tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size);
 
        tcp_register_congestion_control(&tcp_reno);