netdev - Re: [PATCH net-next] sched: add dualpi2 scheduler module

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Message-ID: <c08b2b3d-5186-e16a-5e13-45c9c3f8e604@gmail.com>
Date:   Mon, 11 Mar 2019 09:12:25 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Olga Albisser <olgabnd@...il.com>, netdev@...r.kernel.org
Cc:     Olga Albisser <olga@...isser.org>,
        Koen De Schepper <koen.de_schepper@...ia-bell-labs.com>,
        Oliver Tilmans <olivier.tilmans@...ia-bell-labs.com>,
        Bob Briscoe <research@...briscoe.net>,
        Henrik Steen <henrist@...rist.net>
Subject: Re: [PATCH net-next] sched: add dualpi2 scheduler module



On 03/11/2019 09:03 AM, Eric Dumazet wrote:
> 
> 
> On 03/11/2019 08:14 AM, Olga Albisser wrote:
> 
>> +
>> +static u32 get_ecn_field(struct sk_buff *skb)
>> +{
>> +	switch (skb->protocol) {
> 
> tc_skb_protocol(skb)
> 
>> +	case cpu_to_be16(ETH_P_IP):
> 
> Theoretically you have to use pskb_may_pull() before assuming network header is in the linear part of skb (skb->head)

You can take a look at dsmark_enqueue() for a starting point.