net/sched: cbs: fix port_rate miscalculation
The Credit Based Shaper heavily depends on link speed to calculate the scheduling credits, we can't properly calculate the credits if the device has failed to report the link speed. In that case we can't dequeue packets assuming a wrong port rate that will result into an inconsistent credit distribution. This patch makes sure we fail to dequeue case: 1) __ethtool_get_link_ksettings() reports error or 2) the ethernet driver failed to set the ksettings' speed value (setting link speed to SPEED_UNKNOWN). Additionally we properly re calculate the port rate whenever the link speed is changed. Fixes: 3d0bd028 ("net/sched: Add support for HW offloading for CBS") Signed-off-by:Leandro Dorileo <leandro.maciel.dorileo@intel.com> Reviewed-by:
Vedang Patel <vedang.patel@intel.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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