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| author | Maxim Mikityanskiy <maximmi@mellanox.com> | 2020-08-17 16:34:05 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-08-18 16:00:24 -0700 |
| commit | 840110a4eae190dcbb9907d68216d5d1d9f25839 (patch) | |
| tree | bc982c301db02b4a1d8c53c0013d73a4218ec4e1 /net/dccp/feat.h | |
| parent | 4ef1a7cb08e94da1f2f2a34ee6cefe7ae142dc98 (diff) | |
| download | linux-840110a4eae190dcbb9907d68216d5d1d9f25839.tar.gz | |
ethtool: Fix preserving of wanted feature bits in netlink interface
Currently, ethtool-netlink calculates new wanted bits as:
(req_wanted & req_mask) | (old_active & ~req_mask)
It completely discards the old wanted bits, so they are forgotten with
the next ethtool command. Sample steps to reproduce:
1. ethtool -k eth0
tx-tcp-segmentation: on # TSO is on from the beginning
2. ethtool -K eth0 tx off
tx-tcp-segmentation: off [not requested]
3. ethtool -k eth0
tx-tcp-segmentation: off [requested on]
4. ethtool -K eth0 rx off # Some change unrelated to TSO
5. ethtool -k eth0
tx-tcp-segmentation: off # "Wanted on" is forgotten
This commit fixes it by changing the formula to:
(req_wanted & req_mask) | (old_wanted & ~req_mask),
where old_active was replaced by old_wanted to account for the wanted
bits.
The shortcut condition for the case where nothing was changed now
compares wanted bitmasks, instead of wanted to active.
Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/feat.h')
0 files changed, 0 insertions, 0 deletions