RE: [PATCH libibverbs 2/3] Add support for TCP segmentation offload (TSO)

From: Or Gerlitz
Sent: Thursday, August 18, 2016 9:06 AM
To: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Bodong Wang
[off-list ref]; Majd Dibbiny [off-list ref]; Tal Alon
[off-list ref]
Subject: Re: [PATCH libibverbs 2/3] Add support for TCP segmentation
offload (TSO)

On 7/28/2016 3:19 PM, Yishai Hadas wrote:

quoted

3) Add IBV_WC_TSO to be used as part of poll_cq to report a TSO

completion.

why is that needed? what's the proposed/possible applicative usage of
that bit?

It's consistent with the kernel API that adds similar bit for LSO.
http://lxr.free-electrons.com/source/include/rdma/ib_verbs.h#L842

Specifically, it can give an application an accurate  knowledge about the completion type
as done for other cases as part of ibv_post_send as of IBV_WC_BIND_MW,
IBV_WC_LOCAL_INV, etc.



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