tree 292a2a641e2d6d3ec960c72ef28310c60549d987
parent d55d282e6af88120ad90e93a88f70e3116dc0e3d
author Paul Durrant <Paul.Durrant@citrix.com> 1386759435 +0000
committer David S. Miller <davem@davemloft.net> 1386873338 -0500

xen-netback: napi: fix abuse of budget

netback seems to be somewhat confused about the napi budget parameter. The
parameter is supposed to limit the number of skbs processed in each poll,
but netback has this confused with grant operations.

This patch fixes that, properly limiting the work done in each poll. Note
that this limit makes sure we do not process any more data from the shared
ring than we intend to pass back from the poll. This is important to
prevent tx_queue potentially growing without bound.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>