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Re: [lwip-users] lwip on freertos

From: openocd
Subject: Re: [lwip-users] lwip on freertos
Date: Tue, 9 Jun 2009 20:57:03 +0200 (CEST)
User-agent: SquirrelMail/1.4.16

> On Tue, 2009-06-09 at 17:12 +0200, Jesper Vestergaard wrote:
>> I have found the problem. ip_output_if generates a header for the packet
>> but there's not enough room for it and  pbuf_header(p, IP_HLEN)) fails.
>> To be more precise it is the if ((u8_t *)p->payload < (u8_t *)p +
>> SIZEOF_STRUCT_PBUF) check in pbuf_header which fails.
>> What can i do to fix this problem?
> That is a very strange problem, the pbuf should have been allocated with
> enough space to contain the IP header.
> Unfortunately, this code has changed a lot recently (since 1.3.0) so
> it's hard to diagnose using the current CVS head, or even establish if
> the problem still exists.
> To investigate, look for where the pbuf is allocated (should be in
> tcp_enqueue() I think), and see what value is given for the first
> argument "pbuf_layer layer".  It is this that should control the
> additional space allocated for lower layer headers.
> Kieran
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> lwip-users mailing list
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I will look into the allocation in tcp_enqueue() and also get the CVS
version for comparison.

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