From 3de88c9113f88c04abda339f1aa629397bf89e02 Mon Sep 17 00:00:00 2001 From: Luigi Rizzo Date: Mon, 18 Nov 2019 16:19:51 -0800 Subject: [PATCH] net-af_xdp: Use correct number of channels from ethtool 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 Signed-off-by: Alexei Starovoitov Reviewed-by: Jakub Kicinski Acked-by: Magnus Karlsson Link: https://lore.kernel.org/bpf/20191119001951.92930-1-lrizzo@google.com --- tools/lib/bpf/xsk.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index 303ed63..8e0ffa8 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -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); -- 2.7.4