Searched hist:f81781835f0adfae8d701545386030d223efcd6f (Results 1 – 1 of 1) sorted by relevance
/linux/drivers/net/ethernet/google/gve/ |
H A D | gve_main.c | diff f81781835f0adfae8d701545386030d223efcd6f Mon May 17 23:08:14 CEST 2021 Catherine Sullivan <csully@google.com> gve: Upgrade memory barrier in poll routine
As currently written, if the driver checks for more work (via gve_tx_poll or gve_rx_poll) before the device posts work and the irq doorbell is not unmasked (via iowrite32be(GVE_IRQ_ACK | GVE_IRQ_EVENT, ...)) before the device attempts to raise an interrupt, an interrupt is lost and this could potentially lead to the traffic being completely halted. For example, if a tx queue has already been stopped, the driver won't get the chance to complete work and egress will be halted.
We need a full memory barrier in the poll routine to ensure that the irq doorbell is unmasked before the driver checks for more work.
Fixes: f5cedc84a30d ("gve: Add transmit and receive support") Signed-off-by: Catherine Sullivan <csully@google.com> Signed-off-by: David Awogbemila <awogbemila@google.com> Acked-by: Willem de Brujin <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
|