netdev - Re: [PATCH net-next v2] Revert "net: Re-use and set mono_delivery

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Date: Thu, 14 Mar 2024 05:54:14 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Abhishek Chauhan <quic_abchauha@...cinc.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Andrew Halaney <ahalaney@...hat.com>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Martin KaFai Lau <martin.lau@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Daniel Borkmann <daniel@...earbox.net>
Cc: kernel@...cinc.com
Subject: Re: [PATCH net-next v2] Revert "net: Re-use and set
 mono_delivery_time bit for userspace tstamp packets"

Abhishek Chauhan wrote:
> This reverts commit 30bb896b98fce7d823a96fc02cd69be30384a5cc.

Upstream SHA1 is 885c36e59f46375c138de18ff1692f18eff67b7f ?

> The patch currently broke the bpf selftest test_tc_dtime because
> uapi field __sk_buff->tstamp_type depends on skb->mono_delivery_time which
> does not necessarily mean mono with the original fix as the bit was re-used
> for userspace timestamp as well to avoid tstamp reset in the forwarding 
> path. To solve this we need to keep mono_delivery_time as ease and 

minor typo: as ease -> as is

> introduce another bit called user_delivery_time and fall back to the 
> initial proposal of setting the user_delivery_time bit based on 
> sk_clockid set from userspace.
> 
> Link: https://lore.kernel.org/netdev/bc037db4-58bb-4861-ac31-a361a93841d3@linux.dev/
> Signed-off-by: Abhishek Chauhan <quic_abchauha@...cinc.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>
once the SHA1 is verified/fixed.