netdev - Re: Handling receive packets with limited buffer space

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Message-ID: <8739zvca0b.fsf@basil.nowhere.org>
Date:	Sat, 20 Mar 2010 16:01:40 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Amit Uttamchandani <amit.uttam@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Handling receive packets with limited buffer space

Amit Uttamchandani <amit.uttam@...il.com> writes:

> In my modified ethoc.c driver, I am using only one receive buffer
> descriptor due to limited space. This works fairly well for small
> packets (arp, pings, etc.).
>
> However, doing a 'wget' and downloading a file causes lots of drops and
> thus results in a terminated connection.
>
> How do I go about dealing with this? I tried stopping the queue
> (netif_stop_queue) while I'm processing the rx skb and then resuming it
> once I'm done, but this did not seem to help.
>
> Any ideas on this?

You'll need to allocate a new skb and copy into it before
passing the data up the stack.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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