netdev - Re: [PATCH v4 5/5] io_uring/netcmd: add tx timestamping cmd support

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Message-ID: <684f8261d288f_1e2690294b1@willemb.c.googlers.com.notmuch>
Date: Sun, 15 Jun 2025 22:33:05 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Pavel Begunkov <asml.silence@...il.com>, 
 io-uring@...r.kernel.org, 
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: asml.silence@...il.com, 
 netdev@...r.kernel.org, 
 Eric Dumazet <edumazet@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...zon.com>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Willem de Bruijn <willemb@...gle.com>, 
 "David S . Miller" <davem@...emloft.net>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Richard Cochran <richardcochran@...il.com>, 
 Stanislav Fomichev <sdf@...ichev.me>, 
 Jason Xing <kerneljasonxing@...il.com>
Subject: Re: [PATCH v4 5/5] io_uring/netcmd: add tx timestamping cmd support

Pavel Begunkov wrote:
> Add a new socket command which returns tx time stamps to the user. It
> provide an alternative to the existing error queue recvmsg interface.
> The command works in a polled multishot mode, which means io_uring will
> poll the socket and keep posting timestamps until the request is
> cancelled or fails in any other way (e.g. with no space in the CQ). It
> reuses the net infra and grabs timestamps from the socket's error queue.
> 
> The command requires IORING_SETUP_CQE32. All non-final CQEs (marked with
> IORING_CQE_F_MORE) have cqe->res set to the tskey, and the upper 16 bits
> of cqe->flags keep tstype (i.e. offset by IORING_CQE_BUFFER_SHIFT). The
> timevalue is store in the upper part of the extended CQE. The final
> completion won't have IORING_CQE_F_MORE and will have cqe->res storing
> 0/error.
> 
> Suggested-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>