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ethtool: set device channel counts with CHANNELS_SET request

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Implement CHANNELS_SET netlink request to set channel counts of a network
device. These are traditionally set with ETHTOOL_SCHANNELS ioctl request.

Like the ioctl implementation, the generic ethtool code checks if supplied
values do not exceed driver defined limits; if they do, first offending
attribute is reported using extack. Checks preventing removing channels
used for RX indirection table or zerocopy AF_XDP socket are also
implemented.

Move ethtool_get_max_rxfh_channel() helper into common.c so that it can be
used by both ioctl and netlink code.

v2:
  - fix netdev reference leak in error path (found by Jakub Kicinsky)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek
2020-03-12 21:08:43 +01:00
committed by David S. Miller
parent 0c84979c95
commit e19c591eaf
8 changed files with 177 additions and 32 deletions
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include/uapi/linux/ethtool_netlink.h
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@@ -31,6 +31,7 @@ enum {
ETHTOOL_MSG_RINGS_GET,
ETHTOOL_MSG_RINGS_SET,
ETHTOOL_MSG_CHANNELS_GET,
ETHTOOL_MSG_CHANNELS_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,