From: Luigi Rizzo lrizzo@google.com
[ Upstream commit 3de88c9113f88c04abda339f1aa629397bf89e02 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- 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 a73b79d29333..70f9e10de286 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -344,13 +344,18 @@ 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);