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

On Thu, Aug 18, 2016 at 10:55 AM, Yishai Hadas [off-list ref] wrote:

quoted

From: Or Gerlitz

quoted

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

C&P is not something you want to use as argument, specifically if no
one uses this 10y old define nowadays (and maybe never)

net.git]# git grep IB_WC_LSO drivers/infiniband/ include/rdma/
drivers/infiniband/hw/mlx4/cq.c: wc->opcode    = IB_WC_LSO;
include/rdma/ib_verbs.h:        IB_WC_LSO,

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.

IPoIB uses LSO for 10y and doesn't need that, I don't see why
user-space IPoIBs would need that
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