netdev - Re: [bpf PATCH 7/9] bpf: sockmap/tls, skmsg can have wrapped skmsg that needs extra chaining

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Date:   Thu, 09 Jan 2020 15:13:16 -0800
From:   "Jonathan Lemon" <jlemon@...gsvamp.com>
To:     "John Fastabend" <john.fastabend@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net
Subject: Re: [bpf PATCH 7/9] bpf: sockmap/tls, skmsg can have wrapped skmsg
 that needs extra chaining



On 8 Jan 2020, at 13:15, John Fastabend wrote:

> Its possible through a set of push, pop, apply helper calls to construct
> a skmsg, which is just a ring of scatterlist elements, with the start
> value larger than the end value. For example,
>
>       end       start
>   |_0_|_1_| ... |_n_|_n+1_|
>
> Where end points at 1 and start points and n so that valid elements is
> the set {n, n+1, 0, 1}.
>
> Currently, because we don't build the correct chain only {n, n+1} will
> be sent. This adds a check and sg_chain call to correctly submit the
> above to the crypto and tls send path.
>
> Fixes: d3b18ad31f93d ("tls: add bpf support to sk_msg handling")
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>