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net: ethtool: don't require empty header nests

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Ethtool currently requires a header nest (which is used to carry
the common family options) in all requests including dumps.

  $ cli.py --spec netlink/specs/ethtool.yaml --dump channels-get
  lib.ynl.NlError: Netlink error: Invalid argument
  nl_len = 64 (48) nl_flags = 0x300 nl_type = 2
	error: -22      extack: {'msg': 'request header missing'}

  $ cli.py --spec netlink/specs/ethtool.yaml --dump channels-get \
           --json '{"header":{}}';  )
  [{'combined-count': 1,
    'combined-max': 1,
    'header': {'dev-index': 2, 'dev-name': 'enp1s0'}}]

Requiring the header nest to always be there may seem nice
from the consistency perspective, but it's not serving any
practical purpose. We shouldn't burden the user like this.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2023-06-09 14:53:31 -07:00 committed by David S. Miller
parent 5ab8c41cef
commit 500e1340d1
1 changed files with 2 additions and 0 deletions
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2
net/ethtool/netlink.c
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@ -96,6 +96,8 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
int ret;
if (!header) {
if (!require_dev)
return 0;
NL_SET_ERR_MSG(extack, "request header missing");
return -EINVAL;
}