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ethtool: provide channel counts with CHANNELS_GET request

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Implement CHANNELS_GET request to get channel counts of a network device.
These are traditionally available via ETHTOOL_GCHANNELS ioctl request.

Omit attributes for channel types which are not supported by driver or
device (zero reported for maximum).

v2: (all suggested by Jakub Kicinski)
  - minor cleanup in channels_prepare_data()
  - more descriptive channels_reply_size()
  - omit attributes with zero max count

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 21:08:38 +01:00 • committed by David S. Miller
parent bc9d1c995e
commit 0c84979c95
6 changed files with 169 additions and 2 deletions
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1
net/ethtool/netlink.h
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@ -340,6 +340,7 @@ extern const struct ethnl_request_ops ethnl_wol_request_ops;
extern const struct ethnl_request_ops ethnl_features_request_ops;
extern const struct ethnl_request_ops ethnl_privflags_request_ops;
extern const struct ethnl_request_ops ethnl_rings_request_ops;
extern const struct ethnl_request_ops ethnl_channels_request_ops;
int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);