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xen-netback: correctly schedule rate-limited queues

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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>
This commit is contained in:
Wei Liu
2017-06-21 10:21:22 +01:00
committed by David S. Miller
parent 191cdb3822
commit dfa523ae9f
3 changed files with 11 additions and 2 deletions
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1
drivers/net/xen-netback/common.h
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@@ -199,6 +199,7 @@ struct xenvif_queue { /* Per-queue data for xenvif */
unsigned long remaining_credit;
struct timer_list credit_timeout;
u64 credit_window_start;
bool rate_limited;
/* Statistics */
struct xenvif_stats stats;