[Bug 20944] New: mbuf should be aligned to 128 bytes boundry.

[bugzilla-daemon at ecoscentric dot com]

http://bugs.ecos.sourceware.org/show_bug.cgi?id=20944

           Summary: mbuf should be aligned to 128 bytes boundry.
           Product: eCos
           Version: 1.3.1
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: low
         Component: TCPIP
        AssignedTo: gary at mlbassoc dot com
        ReportedBy: anonymous at sourceware dot cygnus dot com


In eCos TCP/IP package v1_0b1: 
mbuf should be aligned to 128 bytes boundry.
but the pointer returned from cyg_net_mbuf_alloc(...) 
may not aligned to 128 bytes boundry.

Fix:
align the base address of mbuf pool to 128 bytes boundry.

static unsigned char net_mbufs_area[NET_MBUFS_SIZE + MSIZE];

cyg_kmem_init()
{
  ...
  unsigned char *p = (net_mbufs_area + MSIZE - 1) & ~(MSIZE - 1);
  ...
  cyg_mempool_fix_create(p, NET_MBUFS_SIZE, MSIZE, ...);
  ...
}


---------------------------------------------------------------------------

Originator:
Yong Wu

Organization:
none

Audit-Trail:
From: Hugo Tyson <hmt at cygnus dot co dot uk>
To: bugs at cygnus dot com
Cc:  Subject: Re: ecos/20944: Bug report form
Date: Mon, 7 Aug 2000 11:58:11 +0100

 I already fixed this - it actually didn't matter except for certain special
 circumstances.  The ChangeLog entry follows:
 
 2000-06-23  Hugo Tyson  <hmt at cygnus dot co dot uk>
 
         * src/ecos/support.c (cyg_net_mbuf_alloc, cyg_kmem_init): Align
         the mbuf pool to MSIZE [128] bytes.  That way dtom() works, nasty
         though it is.  That's needed for ip reassembly in ip_input.c, when
         dealing with large icmp-layer packets eg. ping -s 2000 ...
 
 HTH,
 	- Huge

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