linux-kernel - Re: [RFC PATCH bpf-next v1 1/3] net: Rename mono_delivery_time to tstamp

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Date: Wed, 10 Apr 2024 12:04:06 -0700
From: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.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>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Daniel Borkmann <daniel@...earbox.net>, bpf <bpf@...r.kernel.org>
CC: <kernel@...cinc.com>
Subject: Re: [RFC PATCH bpf-next v1 1/3] net: Rename mono_delivery_time to
 tstamp_type for scalabilty



On 4/10/2024 8:30 AM, Willem de Bruijn wrote:
> Abhishek Chauhan wrote:
>> mono_delivery_time was added to check if skb->tstamp has delivery
>> time in mono clock base (i.e. EDT) otherwise skb->tstamp has
>> timestamp in ingress and delivery_time at egress.
>>
>> Renaming the bitfield from mono_delivery_time to tstamp_type is for
>> extensibilty for other timestamps such as userspace timestamp
>> (i.e. SO_TXTIME) set via sock opts.
>>
>> Bridge driver today has no support to forward the userspace timestamp
>> packets and ends up resetting the timestamp. ETF qdisc checks the
>> packet coming from userspace and encounters to be 0 thereby dropping
>> time sensitive packets. These changes will allow userspace timestamps
>> packets to be forwarded from the bridge to NIC drivers.
>>
>> In future tstamp_type:1 can be extended to support userspace timestamp
>> by increasing the bitfield.
>>
>> Link: https://lore.kernel.org/netdev/bc037db4-58bb-4861-ac31-a361a93841d3@linux.dev/
>> Signed-off-by: Abhishek Chauhan <quic_abchauha@...cinc.com>
>> ---
>>  include/linux/skbuff.h                     | 18 +++++++++---------
>>  include/net/inet_frag.h                    |  4 ++--
>>  net/bridge/netfilter/nf_conntrack_bridge.c |  6 +++---
>>  net/core/dev.c                             |  2 +-
>>  net/core/filter.c                          |  8 ++++----
>>  net/ipv4/inet_fragment.c                   |  2 +-
>>  net/ipv4/ip_fragment.c                     |  2 +-
>>  net/ipv4/ip_output.c                       |  8 ++++----
>>  net/ipv6/ip6_output.c                      |  6 +++---
>>  net/ipv6/netfilter.c                       |  6 +++---
>>  net/ipv6/netfilter/nf_conntrack_reasm.c    |  2 +-
>>  net/ipv6/reassembly.c                      |  2 +-
>>  net/sched/act_bpf.c                        |  4 ++--
>>  net/sched/cls_bpf.c                        |  4 ++--
>>  14 files changed, 37 insertions(+), 37 deletions(-)
> 
> Since the next patch against touches many of the same lines, probably
> can just squash the two.

Sounds good i can do that. 
Make only 2 patches 
1. rename + assign tstamp_type
2. introduce another bit for clock_id base time