netdev - Re: [PATCH bpf-next v3 08/11] samples/bpf: add unaligned chunks mode support to xdpsock

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Date:   Thu, 25 Jul 2019 09:43:06 +0000
From:   Maxim Mikityanskiy <maximmi@...lanox.com>
To:     Kevin Laatz <kevin.laatz@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "bjorn.topel@...el.com" <bjorn.topel@...el.com>,
        "magnus.karlsson@...el.com" <magnus.karlsson@...el.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "jonathan.lemon@...il.com" <jonathan.lemon@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "stephen@...workplumber.org" <stephen@...workplumber.org>,
        "bruce.richardson@...el.com" <bruce.richardson@...el.com>,
        "ciara.loftus@...el.com" <ciara.loftus@...el.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH bpf-next v3 08/11] samples/bpf: add unaligned chunks mode
 support to xdpsock

On 2019-07-24 08:10, Kevin Laatz wrote:
> This patch adds support for the unaligned chunks mode. The addition of the
> unaligned chunks option will allow users to run the application with more
> relaxed chunk placement in the XDP umem.
> 
> Unaligned chunks mode can be used with the '-u' or '--unaligned' command
> line options.
> 
> Signed-off-by: Kevin Laatz <kevin.laatz@...el.com>
> Signed-off-by: Ciara Loftus <ciara.loftus@...el.com>
> ---
>   samples/bpf/xdpsock_user.c | 17 +++++++++++++++--
>   1 file changed, 15 insertions(+), 2 deletions(-)

<...>

> @@ -372,6 +378,7 @@ static void usage(const char *prog)
>   		"  -z, --zero-copy      Force zero-copy mode.\n"
>   		"  -c, --copy           Force copy mode.\n"
>   		"  -f, --frame-size=n   Set the frame size (must be a power of two, default is %d).\n"

Help text for -f has to be updated, it doesn't have to be a power of two 
if -u is specified.

> +		"  -u, --unaligned	Enable unaligned chunk placement\n"

<...>

>   
> -	if (opt_xsk_frame_size & (opt_xsk_frame_size - 1)) {
> +	if ((opt_xsk_frame_size & (opt_xsk_frame_size - 1)) &&
> +			!opt_unaligned_chunks) {
>   		fprintf(stderr, "--frame-size=%d is not a power of two\n",
>   			opt_xsk_frame_size);
>   		usage(basename(argv[0]));
>