netdev - Re: [PATCH net-next v4] net: Re-use and set mono_delivery

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Message-ID: <5b1d5758-3510-47c5-97e9-2edc5112d046@linux.dev>
Date: Tue, 19 Mar 2024 12:46:26 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>, kernel@...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>,
 Martin KaFai Lau <martin.lau@...nel.org>, bpf <bpf@...r.kernel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Alexei Starovoitov <ast@...nel.org>,
 Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH net-next v4] net: Re-use and set mono_delivery_time bit
 for userspace tstamp packets

On 3/18/24 12:02 PM, Abhishek Chauhan (ABC) wrote:
>>>>>> I think the "struct inet_frag_queue" also needs a new "user_delivery_time"
>>>>>> field. "mono_delivery_time" is already in there.
>>> [ ... ]
>>>
> Martin, Do we really need to add user_delivery_time as part of inet_frag_queue struct? I was wondering why is this required since we are using tstamp_type:2 to
> distinguish between timestamp anyway .

The context for this was before combining mono_delivery_time:1 and 
user_delivery_time:1 into tstamp_type:2. No need to add user_delivery_time to 
inet_frag_queue because it is combined into tstamp_type:2. If 
mono_delivery_time:1 is replaced with tstamp_type:2 in sk_buff, the same should 
be done in inet_frag_queue.