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ethtool: add ethnl_parse_bitset() helper

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Unlike other SET type commands, modifying netdev features is required to
provide a reply telling userspace what was actually changed, compared to
what was requested. For that purpose, the "modified" flag provided by
ethnl_update_bitset() is not sufficient, we need full information which
bits were requested to change.

Therefore provide ethnl_parse_bitset() returning effective value and mask
bitmaps equivalent to the contents of a bitset nested attribute.

v2: use non-atomic __set_bit() (suggested by David Miller)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek
2020-03-12 21:07:53 +01:00
committed by David S. Miller
parent 0524399d46
commit 88db6d1e4f
2 changed files with 98 additions and 0 deletions
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4
net/ethtool/bitset.h
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@@ -26,5 +26,9 @@ int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
const struct nlattr *attr, ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod);
int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
unsigned int nbits, const struct nlattr *attr,
ethnl_string_array_t names,
struct netlink_ext_ack *extack);
#endif /* _NET_ETHTOOL_BITSET_H */