diff options
| author |   Wei Liu <wei.liu2@citrix.com> | 2017-06-21 10:21:22 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-06-22 11:15:42 -0400 |
| commit | dfa523ae9f2542bee4cddaea37b3be3e157f6e6b (patch) | |
| tree | 3c31b603c04bad0bb51c19305488cc12140ff7cb /drivers/net/xen-netback/netback.c | |
| parent | veth: Be more robust on network device creation when no attributes (diff) | |
| download | linux-dev-dfa523ae9f2542bee4cddaea37b3be3e157f6e6b.tar.xz linux-dev-dfa523ae9f2542bee4cddaea37b3be3e157f6e6b.zip | |
xen-netback: correctly schedule rate-limited queues
Add a flag to indicate if a queue is rate-limited. Test the flag in
NAPI poll handler and avoid rescheduling the queue if true, otherwise
we risk locking up the host. The rescheduling will be done in the
timer callback function.
Reported-by: Jean-Louis Dupond <jean-louis@dupond.be>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Tested-by: Jean-Louis Dupond <jean-louis@dupond.be>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/xen-netback/netback.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 602d408fa25e..5042ff8d449a 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -180,6 +180,7 @@ static void tx_add_credit(struct xenvif_queue *queue) max_credit = ULONG_MAX; /* wrapped: clamp to ULONG_MAX */ queue->remaining_credit = min(max_credit, max_burst); + queue->rate_limited = false; } void xenvif_tx_credit_callback(unsigned long data) @@ -686,8 +687,10 @@ static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) msecs_to_jiffies(queue->credit_usec / 1000); /* Timer could already be pending in rare cases. */ - if (timer_pending(&queue->credit_timeout)) + if (timer_pending(&queue->credit_timeout)) { + queue->rate_limited = true; return true; + } /* Passed the point where we can replenish credit? */ if (time_after_eq64(now, next_credit)) { @@ -702,6 +705,7 @@ static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) mod_timer(&queue->credit_timeout, next_credit); queue->credit_window_start = next_credit; + queue->rate_limited = true; return true; } |