netdev - Re: [bpf-next PATCH v2 03/18] net: do_tcp_sendpages flag to avoid SKBTX_SHARED

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Message-Id: <20180315.144046.1660172203620629706.davem@davemloft.net>
Date:   Thu, 15 Mar 2018 14:40:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     john.fastabend@...il.com
Cc:     ast@...nel.org, daniel@...earbox.net, davejwatson@...com,
        netdev@...r.kernel.org
Subject: Re: [bpf-next PATCH v2 03/18] net: do_tcp_sendpages flag to avoid
 SKBTX_SHARED_FRAG

From: John Fastabend <john.fastabend@...il.com>
Date: Mon, 12 Mar 2018 12:23:19 -0700

> When calling do_tcp_sendpages() from in kernel and we know the data
> has no references from user side we can omit SKBTX_SHARED_FRAG flag.
> This patch adds an internal flag, NO_SKBTX_SHARED_FRAG that can be used
> to omit setting SKBTX_SHARED_FRAG.
> 
> The flag is not exposed to userspace because the sendpage call from
> the splice logic masks out all bits except MSG_MORE.
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Acked-by: David S. Miller <davem@...emloft.net>