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net-af_xdp: Use correct number of channels from ethtool

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Drivers use different fields to report the number of channels, so take
the maximum of all data channels (rx, tx, combined) when determining the
size of the xsk map. The current code used only 'combined' which was set
to 0 in some drivers e.g. mlx4.

Tested: compiled and run xdpsock -q 3 -r -S on mlx4

Signed-off-by: Luigi Rizzo <lrizzo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20191119001951.92930-1-lrizzo@google.com
This commit is contained in:
Luigi Rizzo 2019-11-18 16:19:51 -08:00 committed by Alexei Starovoitov
parent 0424c5a4dd
commit 3de88c9113
1 changed files with 8 additions and 3 deletions
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11
tools/lib/bpf/xsk.c
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@ -431,13 +431,18 @@ static int xsk_get_max_queues(struct xsk_socket *xsk)
goto out;
}
if (err || channels.max_combined == 0)
if (err) {
/* If the device says it has no channels, then all traffic
* is sent to a single stream, so max queues = 1.
*/
ret = 1;
else
ret = channels.max_combined;
} else {
/* Take the max of rx, tx, combined. Drivers return
* the number of channels in different ways.
*/
ret = max(channels.max_rx, channels.max_tx);
ret = max(ret, (int)channels.max_combined);
}
out:
close(fd);