David Vrabel 26c0e10258 xen-netback: support frontends without feature-rx-notify again ... Commit bc96f648df (xen-netback: make feature-rx-notify mandatory) incorrectly assumed that there were no frontends in use that did not support this feature. But the frontend driver in MiniOS does not and since this is used by (qemu) stubdoms, these stopped working. Netback sort of works as-is in this mode except: - If there are no Rx requests and the internal Rx queue fills, only the drain timeout will wake the thread. The default drain timeout of 10 s would give unacceptable pauses. - If an Rx stall was detected and the internal Rx queue is drained, then the Rx thread would never wake. Handle these two cases (when feature-rx-notify is disabled) by: - Reducing the drain timeout to 30 ms. - Disabling Rx stall detection. Reported-by: John <jw@nuclearfallout.net> Tested-by: John <jw@nuclearfallout.net> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-12-18 12:49:49 -05:00
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Makefile	…
common.h	xen-netback: support frontends without feature-rx-notify again	2014-12-18 12:49:49 -05:00
interface.c	xen-netback: support frontends without feature-rx-notify again	2014-12-18 12:49:49 -05:00
netback.c	xen-netback: support frontends without feature-rx-notify again	2014-12-18 12:49:49 -05:00
xenbus.c	xen-netback: support frontends without feature-rx-notify again	2014-12-18 12:49:49 -05:00