[lwip-devel] [bug #29148] Incorrect PBUF_POOL_BUFSIZE for ports where ETH_PAD_SIZE > 0

[Petr Cernin]

URL:
  <http://savannah.nongnu.org/bugs/?29148>

                 Summary: Incorrect PBUF_POOL_BUFSIZE for ports where
ETH_PAD_SIZE > 0
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: cerninp
            Submitted on: Tue 09 Mar 2010 06:44:33 PM GMT
                Category: pbufs
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

Hello,

In opt.h the default value of PBUF_POOL_BUFFSIZE is defined as:

LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)

I think there should be

LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN+ETH_PAD_SIZE)

Current default value isn't correct for ports where ETH_PAD_SIZE > 0 (where
unaligned accesses to memory are not allowed).

Am I right ?




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