We currently don't have such an option. >From my observation on my machines it seems that eth buffers always seem to start with xxxxA for example: eth.pkt starts at 0xFFFFFA800DD5F38A eth.pkt starts at 0xFFFFFA800DD6042A eth.pkt starts at 0xFFFFFA800DD614CA eth.pkt starts at 0xFFFFFA800DD6256A eth.pkt starts at 0xFFFFFA800DD6360A eth.pkt starts at 0xFFFFFA800DD646AA eth.pkt starts at 0xFFFFFA800DD6574A eth.pkt starts at 0xFFFFFA800DD667EA
(this was printed with the line " cl_dbg_out("eth.pkt starts at
0x%p\n", &p_desc->buf.eth.pkt);")
Since the eth header starts 14 bytes later it will always start on
0xa+0xE = 0x18.
In other words the addresses on "my machine" are always aligned to a 64
bits boundary (that is take the 8 from the 0x18 and multiply it with 8)
which is probably right.
Still, if you want to be sure that buffers are always aligned well, you
probably need to allocate bigger buffers and use whatever part from
them.
Here is some more technical data:
allocation is being done at the function __buf_mgr_init()
on the line " 0, 0, sizeof(ipoib_recv_desc_t), __recv_ctor, NULL,
p_port );"
you can increase the size that is allocated there, and on the function
__recv_ctor you can change the line
p_desc = (ipoib_recv_desc_t*)p_object;
to align to where ever you want.
Thanks
Tzachi
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of John Russo
Sent: Monday, January 18, 2010 8:40 PM
To: [email protected]
Subject: [ofw] Buffer alignment in IPoIB
We have found that in IPoIB, packets that were handed over from
IPoIB had their buffer addresses misaligned.
In OFED there is an option to align buffers. Do we have that
same option in the WinOF version?.
John F. Russo
Engineering Manager
QLogic Corporation
780 Fifth Avenue
Suite 140
King of Prussia, PA 19406
Direct: 610-233-4866
Fax: 610-233-4777
Cell: 610-246-9903
www.qlogic.com <http://www.qlogic.com>
<<image001.jpg>>
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