Re: problems with em(4) since update to driver 7.2.2

Hello,

2011/5/4 Arnaud Lacombe <lacombar_at_gmail.com>:
> Hi,
>
> On Wed, May 4, 2011 at 3:58 AM, Olivier Smedts <olivier_at_gid0.org> wrote:
>> em0: Using an MSI interrupt
>> em0: Ethernet address: d4:85:64:b2:aa:f5
>> em0: Could not setup receive structures
>> em0: Could not setup receive structures
>>
>> What can we do to help you debug this ?
>>
> At some point in time, in late February, I had the same issue on a
> 6-interface machine. I tracked this down to the fact that the main
> loop in em_setup_receive_ring() was not being entered. This resulted
> in junk being returned as `error'  is not explicitly initialized. At
> the time, the following patch worked for me. Without it the driver was
> unable to initialize with RX/TX ring's size of 512. With it, ring's
> size of 1024 initialized fine.
>
> diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c
> index fb6ed67..f02059a 100644
> --- a/sys/dev/e1000/if_em.c
> +++ b/sys/dev/e1000/if_em.c
> _at__at_ -3901,7 +3901,7 _at__at_ em_setup_receive_ring(struct rx_ring *rxr)
>        struct  adapter         *adapter = rxr->adapter;
>        struct em_buffer        *rxbuf;
>        bus_dma_segment_t       seg[1];
> -       int                     i, j, nsegs, error;
> +       int                     i, j, nsegs, error = 0;

This patch made the trick for me. I'll post what Jack asked for in the
following mail.

> I did not dig much more at the time, but I was definitively seeing an
> odd behavior. Anyhow, I am no longer able to reproduce this with
> 7.2.3, so cannot dig in more details.
>
> Btw, I wish you all luck, it took me nearly two full months to
> convince Jack (and other FreeBSD devs) that there was a bug in the
> mbuf refresh code.
>
>  - Arnaud
>



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