ppp: Don't stop and restart queue on every TX packet

[ This combines upstream commit
  e675f0cc9a872fd152edc0c77acfed19bf28b81e and follow-on bug fix
  commit 9a5d2bd99e0dfe9a31b3c160073ac445ba3d773f ]

For every transmitted packet, ppp_start_xmit() will stop the netdev
queue and then, if appropriate, restart it. This causes the TX softirq
to run, entirely gratuitously.

This is "only" a waste of CPU time in the normal case, but it's actively
harmful when the PPP device is a TEQL slave — the wakeup will cause the
offending device to receive the next TX packet from the TEQL queue, when
it *should* have gone to the next slave in the list. We end up seeing
large bursts of packets on just *one* slave device, rather than using
the full available bandwidth over all slaves.

This patch fixes the problem by *not* unconditionally stopping the queue
in ppp_start_xmit(). It adds a return value from ppp_xmit_process()
which indicates whether the queue should be stopped or not.

It *doesn't* remove the call to netif_wake_queue() from
ppp_xmit_process(), because other code paths (especially from
ppp_output_wakeup()) need it there and it's messy to push it out to the
other callers to do it based on the return value. So we leave it in
place — it's a no-op in the case where the queue wasn't stopped, so it's
harmless in the TX path.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 486b4048850df8afca33d4183b436965b6a23137..3ed983ce71af850860a291e98681745ade1bdfac 100644 (file)
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -968,7 +968,6 @@ ppp_start_xmit(struct sk_buff *skb, struct net_device *dev)
        proto = npindex_to_proto[npi];
        put_unaligned_be16(proto, pp);
 
-       netif_stop_queue(dev);
        skb_queue_tail(&ppp->file.xq, skb);
        ppp_xmit_process(ppp);
        return NETDEV_TX_OK;
@@ -1063,6 +1062,8 @@ ppp_xmit_process(struct ppp *ppp)
                   code that we can accept some more. */
                if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq))
                        netif_wake_queue(ppp->dev);
+               else
+                       netif_stop_queue(ppp->dev);
        }
        ppp_xmit_unlock(ppp);
 }