tcp: add gfp parameter to tcp_fragment

tcp_fragment can be called from process context (from tso_fragment).
Add a new gfp parameter to allow it to preserve atomic memory if
possible.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/tcp.h b/include/net/tcp.h
index e80abe4..7286db8 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -535,7 +535,7 @@ void tcp_retransmit_timer(struct sock *sk);
 void tcp_xmit_retransmit_queue(struct sock *);
 void tcp_simple_retransmit(struct sock *);
 int tcp_trim_head(struct sock *, struct sk_buff *, u32);
-int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int);
+int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int, gfp_t);
 
 void tcp_send_probe0(struct sock *);
 void tcp_send_partial(struct sock *);

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 931529d..40661fc 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1167,7 +1167,7 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb,
                        }
                        pkt_len = new_len;
                }
-               err = tcp_fragment(sk, skb, pkt_len, mss);
+               err = tcp_fragment(sk, skb, pkt_len, mss, GFP_ATOMIC);
                if (err < 0)
                        return err;
        }
@@ -2241,7 +2241,8 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head)
                                break;
 
                        mss = skb_shinfo(skb)->gso_size;
-                       err = tcp_fragment(sk, skb, (packets - oldcnt) * mss, mss);
+                       err = tcp_fragment(sk, skb, (packets - oldcnt) * mss,
+                                          mss, GFP_ATOMIC);
                        if (err < 0)
                                break;
                        cnt = packets;

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index d463c35..ad7549f 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1074,7 +1074,7 @@ static void tcp_adjust_pcount(struct sock *sk, const struct sk_buff *skb, int de
  * Remember, these are still headerless SKBs at this point.
  */
 int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
-                unsigned int mss_now)
+                unsigned int mss_now, gfp_t gfp)
 {
        struct tcp_sock *tp = tcp_sk(sk);
        struct sk_buff *buff;
@@ -1089,11 +1089,11 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
        if (nsize < 0)
                nsize = 0;
 
-       if (skb_unclone(skb, GFP_ATOMIC))
+       if (skb_unclone(skb, gfp))
                return -ENOMEM;
 
        /* Get a new skb... force flag on. */
-       buff = sk_stream_alloc_skb(sk, nsize, GFP_ATOMIC);
+       buff = sk_stream_alloc_skb(sk, nsize, gfp);
        if (buff == NULL)
                return -ENOMEM; /* We'll just try again later. */
 
@@ -1625,7 +1625,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
 
        /* All of a TSO frame must be composed of paged data.  */
        if (skb->len != skb->data_len)
-               return tcp_fragment(sk, skb, len, mss_now);
+               return tcp_fragment(sk, skb, len, mss_now, gfp);
 
        buff = sk_stream_alloc_skb(sk, 0, gfp);
        if (unlikely(buff == NULL))
@@ -2122,7 +2122,8 @@ void tcp_send_loss_probe(struct sock *sk)
                goto rearm_timer;
 
        if ((pcount > 1) && (skb->len > (pcount - 1) * mss)) {
-               if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss)))
+               if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss,
+                                         GFP_ATOMIC)))
                        goto rearm_timer;
                skb = tcp_write_queue_tail(sk);
        }
@@ -2463,7 +2464,7 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
                return -EAGAIN;
 
        if (skb->len > cur_mss) {
-               if (tcp_fragment(sk, skb, cur_mss, cur_mss))
+               if (tcp_fragment(sk, skb, cur_mss, cur_mss, GFP_ATOMIC))
                        return -ENOMEM; /* We'll try again later. */
        } else {
                int oldpcount = tcp_skb_pcount(skb);
@@ -3244,7 +3245,7 @@ int tcp_write_wakeup(struct sock *sk)
                    skb->len > mss) {
                        seg_size = min(seg_size, mss);
                        TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
-                       if (tcp_fragment(sk, skb, seg_size, mss))
+                       if (tcp_fragment(sk, skb, seg_size, mss, GFP_ATOMIC))
                                return -1;
                } else if (!tcp_skb_pcount(skb))
                        tcp_set_skb_tso_segs(sk, skb, mss);