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ethtool: fix ethtool msg len calculation for pause stats

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ETHTOOL_A_PAUSE_STAT_MAX is the MAX attribute id,
so we need to subtract non-stats and add one to
get a count (IOW -2+1 == -1).

Otherwise we'll see:

  ethnl cmd 21: calculated reply length 40, but consumed 52

Fixes: 9a27a33027 ("ethtool: add standard pause stats")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-11-02 15:02:36 -07:00 • committed by David S. Miller
parent 9b65b17db7
commit 1aabe578dd
3 changed files with 7 additions and 3 deletions
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3
include/linux/ethtool_netlink.h
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@ -10,6 +10,9 @@
#define __ETHTOOL_LINK_MODE_MASK_NWORDS \
DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
#define ETHTOOL_PAUSE_STAT_CNT (__ETHTOOL_A_PAUSE_STAT_CNT - \
ETHTOOL_A_PAUSE_STAT_TX_FRAMES)
enum ethtool_multicast_groups {
ETHNL_MCGRP_MONITOR,
};