[openib-general] Immediate data question

[Tang, Changqing]

Roland:
	If I only want to send/recv 4 bytes with immediate data:

On sender side:
	opcode = IBV_WR_SEND_WITH_IMM;
	imm_data = my_4_bytes_data;

	Do I still need to specify sg_list and num_sge ?

On receiver side, because the immediate data is inside the completion
structure, do I need to post a receive for above message ?
If I need to post a receive, do I need to specify sg_list and num_sge
for the receive ?

I looked the spec but did not find useful information.

The reason I ask is that at some point, I can not(or hard) to provide
registered memory only for 4 bytes data.

Thank you.

--CQ



> -----Original Message-----
> From: openib-general-bounces at openib.org 
> [mailto:openib-general-bounces at openib.org] On Behalf Of Roland Dreier
> Sent: Monday, February 05, 2007 8:20 AM
> To: Michael S. Tsirkin
> Cc: openib-general at openib.org
> Subject: Re: [openib-general] idea for ofed 1 2 kernel file structure
> 
>  > I looked a current ofed 1.2 kernel tree and there is 1 
> thing I dislike:
>  > It is hard to see changes that are specific to OFED since 
> we have whole  > kernel history mixed in.
> 
> I'm not sure how you have your branches set up, but if you 
> have something like a "linus" branch that tracks the upstream 
> kernel, it's easy to do stuff like "git log linus.." or "git 
> diff linus.. drivers/infiniband"
> and see the differences that way.
> 
> Using git that way (which is what it's designed for, after 
> all) seems better than some scripts to munge together two trees.
> 
>  - R.
> 
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