net: do not abort bulk send on BQL status

[ Upstream commit fe60faa5063822f2d555f4f326c7dd72a60929bf ]

Before calling dev_hard_start_xmit(), upper layers tried
to cook optimal skb list based on BQL budget.

Problem is that GSO packets can end up comsuming more than
the BQL budget.

Breaking the loop is not useful, since requeued packets
are ahead of any packets still in the qdisc.

It is also more expensive, since next TX completion will
push these packets later, while skbs are not in cpu caches.

It is also a behavior difference with TSO packets, that can
break the BQL limit by a large amount.

Note that drivers should use __netdev_tx_sent_queue()
in order to have optimal xmit_more support, and avoid
useless atomic operations as shown in the following patch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/core/dev.c b/net/core/dev.c
index 547b4daae5cad968e6c8cb25738da9cd18bc65f0..c6fb7e61cb405ab3fb85f2efc70267ff3a402e5d 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2997,7 +2997,7 @@ struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *de
                }
 
                skb = next;
-               if (netif_xmit_stopped(txq) && skb) {
+               if (netif_tx_queue_stopped(txq) && skb) {
                        rc = NETDEV_TX_BUSY;
                        break;
                }