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@xxxxxxxxx>
> Signed-off-by: Ciara Loftus <ciara.loftus@xxxxxxxxx>
> ---
> 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]));
>
