netdev - Re: [PATCH net-next 08/10] tls: rx: use async as an in-out argument

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Date:   Tue, 26 Apr 2022 09:08:35 +0300
From:   Gal Pressman <gal@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, pabeni@...hat.com, netdev@...r.kernel.org,
        borisp@...dia.com, john.fastabend@...il.com, daniel@...earbox.net,
        vfedorenko@...ek.ru
Subject: Re: [PATCH net-next 08/10] tls: rx: use async as an in-out argument

On 25/04/2022 17:54, Jakub Kicinski wrote:
> On Mon, 25 Apr 2022 10:19:45 +0300 Gal Pressman wrote:
>> On 11/04/2022 22:19, Jakub Kicinski wrote:
>>> Propagating EINPROGRESS thru multiple layers of functions is
>>> error prone. Use darg->async as an in/out argument, like we
>>> use darg->zc today. On input it tells the code if async is
>>> allowed, on output if it took place.
>>>
>>> Signed-off-by: Jakub Kicinski <kuba@...nel.org>  
>> I know this is not much to go on, but this patch broke our tls workflows
>> when device offload is enabled.
>> I'm still looking into it, but maybe you have an idea what might have
>> went wrong?
> Oof right, sorry. When packet is already decrypted by HW we'll skip 
> the decrypt completely and leave async to whatever it was at input.
>
> Something like this?
>
> --->8---------
>
> diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
> index ddbe05ec5489..80094528eadb 100644
> --- a/net/tls/tls_sw.c
> +++ b/net/tls/tls_sw.c
> @@ -1562,6 +1562,7 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
>  
>  	if (tlm->decrypted) {
>  		darg->zc = false;
> +		darg->async = false;
>  		return 0;
>  	}
>  
> @@ -1572,6 +1573,7 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
>  		if (err > 0) {
>  			tlm->decrypted = 1;
>  			darg->zc = false;
> +			darg->async = false;
>  			goto decrypt_done;
>  		}
>  	}

Thank you Jakub!
I will run the patch you sent through our testing.