Re: [RFC PATCH bpf-next v5 2/2] net: Add additional bit to support clockid_t timestamp type

["Abhishek Chauhan (ABC)" <quic_abchauha@quicinc.com>]

On 4/26/2024 4:55 PM, Martin KaFai Lau wrote:
> On 4/24/24 3:20 PM, Abhishek Chauhan wrote:
>> diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
>> index a9e819115622..63e4cc30d18d 100644
>> --- a/net/ipv6/ip6_output.c
>> +++ b/net/ipv6/ip6_output.c
>> @@ -955,7 +955,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
>>               if (iter.frag)
>>                   ip6_fraglist_prepare(skb, &iter);
>>   -            skb_set_delivery_time(skb, tstamp, tstamp_type);
>> +            skb_set_tstamp_type_frm_clkid(skb, tstamp, tstamp_type);
>>               err = output(net, sk, skb);
>>               if (!err)
>>                   IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
>> @@ -1016,7 +1016,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
>>           /*
>>            *    Put this fragment into the sending queue.
>>            */
>> -        skb_set_delivery_time(frag, tstamp, tstamp_type);
>> +        skb_set_tstamp_type_frm_clkid(frag, tstamp, tstamp_type);
>>           err = output(net, sk, frag);
>>           if (err)
>>               goto fail;
> 
> When replying another thread and looking closer at the ip6 changes, these two line changes should not be needed.

Similar code exists in ip_output.c for ipv4 packets  =>  ip_do_fragment => I was thinking do we need 
require that code or not. 

Since in both functionality are the same, only difference is protocol. 

From what i see is the for Frag cases in both ipv4 and ipv6, previously skb->tstamp_type was being 
set for each fragments. 

If we are planning to not do it for ip6 the same should follow for ip4 too.