netdev - Re: [net-next v2 2/2] tcp: Add receive timestamp support for receive zerocopy.

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Date:   Fri, 22 Jan 2021 20:07:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arjun Roy <arjunroy.kdev@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, arjunroy@...gle.com,
        edumazet@...gle.com, soheil@...gle.com
Subject: Re: [net-next v2 2/2] tcp: Add receive timestamp support for
 receive zerocopy.

On Wed, 20 Jan 2021 16:41:48 -0800 Arjun Roy wrote:
> diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
> index 768e93bd5b51..b216270105af 100644
> --- a/include/uapi/linux/tcp.h
> +++ b/include/uapi/linux/tcp.h
> @@ -353,5 +353,9 @@ struct tcp_zerocopy_receive {
>  	__u64 copybuf_address;	/* in: copybuf address (small reads) */
>  	__s32 copybuf_len; /* in/out: copybuf bytes avail/used or error */
>  	__u32 flags; /* in: flags */
> +	__u64 msg_control; /* ancillary data */
> +	__u64 msg_controllen;
> +	__u32 msg_flags;
> +	/* __u32 hole;  Next we must add >1 u32 otherwise length checks fail. */

Well, let's hope nobody steps on this landmine.. :)

Applied, thanks!