Hi Andreas,
On Mon, Sep 16, 2019 at 4:25 PM <claudiu.bez...@microchip.com> wrote:
>
>
>
> On 16.09.2019 13:14, Andreas Schwab wrote:
> > External E-Mail
> >
> >
> > On Sep 16 2019, <claudiu.bez...@microchip.com> wrote:
> >
> >> I will have a look on it. It would be good if you could give me some
> >> details about the steps to reproduce it.
> >
> > You need to trigger OOM.
>
> Ok, thank you!
>
> >
> > Andreas.
Can you please try incrementing the rx_prepared_head after skb
allocation as follows?
@@ -920,7 +920,6 @@ static void gem_rx_refill(struct macb_queue *queue)
/* Make hw descriptor updates visible to CPU */
rmb();
- queue->rx_prepared_head++;
desc = macb_rx_desc(queue, entry);
if (!queue->rx_skbuff[entry]) {
@@ -959,6 +958,7 @@ static void gem_rx_refill(struct macb_queue *queue)
dma_wmb();
desc->addr &= ~MACB_BIT(RX_USED);
}
+ queue->rx_prepared_head++;
}
/* Make descriptor updates visible to hardware */
Without this, head will increase even when skb allocation fails. It is a valid
fix anyway and I'll patch it. But I recall a *similar* issue with inconsistent
RX BD chain that was solved by this.
Regards,
Harini
