Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (34 commits)
  b43: Fix warning at drivers/mmc/core/core.c:237 in mmc_wait_for_cmd
  mac80211: fix failure to check kmalloc return value in key_key_read
  libertas: Fix sd8686 firmware reload
  ath9k: Fix incorrect access of rate flags in RC
  netfilter: xt_socket: Make tproto signed in socket_mt6_v1().
  stmmac: enable/disable rx/tx in the core with a single write.
  net: atarilance - flags should be unsigned long
  netxen: fix kdump
  pktgen: Limit how much data we copy onto the stack.
  net: Limit socket I/O iovec total length to INT_MAX.
  USB: gadget: fix ethernet gadget crash in gether_setup
  fib: Fix fib zone and its hash leak on namespace stop
  cxgb3: Fix panic in free_tx_desc()
  cxgb3: fix crash due to manipulating queues before registration
  8390: Don't oops on starting dev queue
  dccp ccid-2: Stop polling
  dccp: Refine the wait-for-ccid mechanism
  dccp: Extend CCID packet dequeueing interface
  dccp: Return-value convention of hc_tx_send_packet()
  igbvf: fix panic on load
  ...

1 files changed, 15 insertions, 8 deletions

diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index d850e291f87..6576eae9e77 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -78,12 +78,9 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hc)
 
 static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
 {
-	struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
-
-	if (hc->tx_pipe < hc->tx_cwnd)
-		return 0;
-
-	return 1; /* XXX CCID should dequeue when ready instead of polling */
+	if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))
+		return CCID_PACKET_WILL_DEQUEUE_LATER;
+	return CCID_PACKET_SEND_AT_ONCE;
 }
 
 static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
@@ -115,6 +112,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
 {
 	struct sock *sk = (struct sock *)data;
 	struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
+	const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
 
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk)) {
@@ -129,8 +127,6 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
 	if (hc->tx_rto > DCCP_RTO_MAX)
 		hc->tx_rto = DCCP_RTO_MAX;
 
-	sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
-
 	/* adjust pipe, cwnd etc */
 	hc->tx_ssthresh = hc->tx_cwnd / 2;
 	if (hc->tx_ssthresh < 2)
@@ -146,6 +142,12 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
 	hc->tx_rpseq    = 0;
 	hc->tx_rpdupack = -1;
 	ccid2_change_l_ack_ratio(sk, 1);
+
+	/* if we were blocked before, we may now send cwnd=1 packet */
+	if (sender_was_blocked)
+		tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
+	/* restart backed-off timer */
+	sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
 out:
 	bh_unlock_sock(sk);
 	sock_put(sk);
@@ -434,6 +436,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
+	const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
 	u64 ackno, seqno;
 	struct ccid2_seq *seqp;
 	unsigned char *vector;
@@ -631,6 +634,10 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		sk_stop_timer(sk, &hc->tx_rtotimer);
 	else
 		sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
+
+	/* check if incoming Acks allow pending packets to be sent */
+	if (sender_was_blocked && !ccid2_cwnd_network_limited(hc))
+		tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
 }
 
 static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)