buglwIP - A Lightweight TCP/IP stack - Bugs: bug #56355, PBUF_POOL_BUFSIZE avoid using...

 
 

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bug #56355: PBUF_POOL_BUFSIZE avoid using multiple buffers for IPv6

Submitted by:  Tymoteusz Bloch <tbloch>
Submitted on:  Mon 20 May 2019 03:40:45 PM UTC  
 
Category:  pbufs Severity:  3 - Normal
Item Group:  Change Request Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
lwIP version:  2.1.1

Mon 20 May 2019 03:47:16 PM UTC, comment #1: 

Mistake
It should be
IPv6 header needs 20 bytes more required by IPv4 header.

Tymoteusz Bloch <tbloch>
Mon 20 May 2019 03:40:45 PM UTC, original submission:  

There were some problems with Mbed-OS using LWIP code and IPv6.

Root cause was related pbuf's size.

It's desirable to avoid using multiple buffers increase LWIP PBUF_POOL_BUFSIZE.

This involves selecting the default size by IP type.
IPv4 header needs 20 bytes more required by IPv6 header.

Proposed changes in opt.h

Replace:

#if !defined PBUF_POOL_BUFSIZE || defined _DOXYGEN_
#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PB
UF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)
#endif

with:

#if !defined PBUF_POOL_BUFSIZE || defined _DOXYGEN_
#if LWIP_IPV6
#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+20+40+PBUF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)
#elif LWIP_IPV4
#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+20+20+PBUF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)
#endif
#endif

Tymoteusz Bloch <tbloch>

 

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