netdev - Re: FW: [PATCH] af_packet: flush complete kernel cache in packet

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Date:	Fri, 2 Sep 2011 10:00:16 -0400
From:	chetan loke <loke.chetan@...il.com>
To:	phil.sutter@...rinet.com, linux-arm-kernel@...ts.infradead.org
Cc:	netdev@...r.kernel.org, linux@....linux.org.uk, davem@...emloft.net
Subject: Re: FW: [PATCH] af_packet: flush complete kernel cache in packet_sendmsg

>
> This flushes the cache before and after accessing the mmapped packet
> buffer. It seems like the call to flush_dcache_page from inside
> __packet_get_status is not enough on Kirkwood (or ARM in general).



> +       kw_extra_cache_flush();
> +       rc = po->tx_ring.pg_vec ? tpacket_snd(po, msg) :
> +                       packet_snd(sock, msg, len);
> +       kw_extra_cache_flush();
> +       return rc;
>  }

If a workaround is needed for mmap, then why not change tpacket_snd?

Also, is this workaround actually working for all the cases? Because
packet_get_status is not being touched in your patch.

Also, I don't see any changes for the Rx-path. Is that working ok?


Chetan Loke
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