netdev - Re: [PATCH net-next v2 08/22] ovpn: implement basic TX path (UDP)

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Message-ID: <4a8aff06-2b9c-497d-a347-4568983926ea@openvpn.net>
Date: Wed, 6 Mar 2024 16:18:58 +0100
From: Antonio Quartulli <antonio@...nvpn.net>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, Sergey Ryazanov <ryazanov.s.a@...il.com>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v2 08/22] ovpn: implement basic TX path (UDP)

On 05/03/2024 20:47, Jakub Kicinski wrote:
> On Mon,  4 Mar 2024 16:08:59 +0100 Antonio Quartulli wrote:
>> +	if (skb_is_gso(skb)) {
>> +		segments = skb_gso_segment(skb, 0);
>> +		if (IS_ERR(segments)) {
>> +			ret = PTR_ERR(segments);
>> +			net_err_ratelimited("%s: cannot segment packet: %d\n", dev->name, ret);
>> +			goto drop;
>> +		}
>> +
>> +		consume_skb(skb);
>> +		skb = segments;
>> +	}
>> +
>> +	/* from this moment on, "skb" might be a list */
>> +
>> +	__skb_queue_head_init(&skb_list);
>> +	skb_list_walk_safe(skb, curr, next) {
>> +		skb_mark_not_on_list(curr);
>> +
>> +		tmp = skb_share_check(curr, GFP_ATOMIC);
> 
> The share check needs to be before the segmentation, I think.

To be honest, I am not 100% sure.

I checked other occurrences of skb_gso_segment() and I don't see 
skb_share_check() being invoked beforehand.

Regards,


-- 
Antonio Quartulli
OpenVPN Inc.