kernel/linux.git/net/ethtool/features.c, branch v6.6.132

ethtool: netlink: Add missing ethnl_ops_begin/complete

2024-01-25T23:36:00+00:00

[ Upstream commit f1172f3ee3a98754d95b968968920a7d03fdebcc ] Accessing an ethernet device that is powered off or clock gated might cause the CPU to hang. Add ethnl_ops_begin/complete in ethnl_set_features() to protect against this. Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request") Signed-off-by: Ludvig Pärsson Link: https://lore.kernel.org/r/20240117-etht2-v2-1-1a96b6e8c650@axis.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin

ethtool: netlink: always pass genl_info to .prepare_data

2023-08-15T22:01:03+00:00

We had a number of bugs in the past because developers forgot to fully test dumps, which pass NULL as info to .prepare_data. .prepare_data implementations would try to access info->extack leading to a null-deref. Now that dumps and notifications can access struct genl_info we can pass it in, and remove the info null checks. Reviewed-by: Vladimir Oltean Tested-by: Vladimir Oltean # pause Reviewed-by: Jiri Pirko Link: https://lore.kernel.org/r/20230814214723.2924989-11-kuba@kernel.org Signed-off-by: Jakub Kicinski

ethtool: use ethnl_parse_header_dev_put()

2021-12-15T10:27:47+00:00

It seems I missed that most ethnl_parse_header_dev_get() callers declare an on-stack struct ethnl_req_info, and that they simply call dev_put(req_info.dev) when about to return. Add ethnl_parse_header_dev_put() helper to properly untrack reference taken by ethnl_parse_header_dev_get(). Fixes: e4b8954074f6 ("netlink: add net device refcount tracker to struct ethnl_req_info") Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ethtool: netlink: Slightly simplify 'ethnl_features_to_bitmap()'

2021-11-30T04:16:46+00:00

The 'dest' bitmap is fully initialized by the 'for' loop, so there is no need to explicitly reset it. This also makes this function in line with 'ethnl_features_to_bitmap32()' which does not clear the destination before writing it. Signed-off-by: Christophe JAILLET Link: https://lore.kernel.org/r/17fca158231c6f03689bd891254f0dd1f4e84cb8.1638091829.git.christophe.jaillet@wanadoo.fr Signed-off-by: Jakub Kicinski

ethtool: netlink: add missing netdev_features_change() call

2020-11-10T01:15:34+00:00

After updating userspace Ethtool from 5.7 to 5.9, I noticed that NETDEV_FEAT_CHANGE is no more raised when changing netdev features through Ethtool. That's because the old Ethtool ioctl interface always calls netdev_features_change() at the end of user request processing to inform the kernel that our netdevice has some features changed, but the new Netlink interface does not. Instead, it just notifies itself with ETHTOOL_MSG_FEATURES_NTF. Replace this ethtool_notify() call with netdev_features_change(), so the kernel will be aware of any features changes, just like in case with the ioctl interface. This does not omit Ethtool notifications, as Ethtool itself listens to NETDEV_FEAT_CHANGE and drops ETHTOOL_MSG_FEATURES_NTF on it (net/ethtool/netlink.c:ethnl_netdev_event()). From v1 [1]: - dropped extra new line as advised by Jakub; - no functional changes. [1] https://lore.kernel.org/netdev/AlZXQ2o5uuTVHCfNGOiGgJ8vJ3KgO5YIWAnQjH0cDE@cp3-web-009.plabs.ch Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request") Signed-off-by: Alexander Lobakin Reviewed-by: Michal Kubecek Link: https://lore.kernel.org/r/ahA2YWXYICz5rbUSQqNG4roJ8OlJzzYQX7PTiG80@cp4-web-028.plabs.ch Signed-off-by: Jakub Kicinski

ethtool: link up ethnl_header_policy as a nested policy

2020-10-06T13:25:55+00:00

To get the most out of parsing by the core, and to allow dumping full policies we need to specify which policy applies to nested attrs. For headers it's ethnl_header_policy. $ sed -i 's@$ETHTOOL_A_.*HEADER\].*=$ { .type = NLA_NESTED },@\1\n\t\tNLA_POLICY_NESTED(ethnl_header_policy),@' net/ethtool/* Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

ethtool: trim policy tables

2020-10-06T13:25:55+00:00

Since ethtool uses strict attribute validation there's no need to initialize all attributes in policy tables. 0 is NLA_UNSPEC which is going to be rejected. Remove the NLA_REJECTs. Similarly attributes above maxattrs are rejected, so there's no need to always size the policy tables to ETHTOOL_A_..._MAX. v2: - new patch Suggested-by: Johannes Berg Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

ethtool: wire up set policies to ops

2020-10-06T13:25:55+00:00

Similarly to get commands wire up the policies of set commands to get parsing by the core and policy dumps. Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

ethtool: wire up get policies to ops

2020-10-06T13:25:55+00:00

Wire up policies for get commands in struct nla_policy of the ethtool family. Make use of genetlink code attr validation and parsing, as well as allow dumping policies to user space. For every ETHTOOL_MSG_*_GET: - add 'ethnl_' prefix to policy name - add extern declaration in net/ethtool/netlink.h - wire up the policy & attr in ethtool_genl_ops[]. - remove .request_policy and .max_attr from ethnl_request_ops. Obviously core only records the first "layer" of parsed attrs so we still need to parse the sub-attrs of the nested header attribute. v2: - merge of patches 1 and 2 from v1 - remove stray empty lines in ops - also remove .max_attr Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

ethtool: Don't omit the netlink reply if no features were changed

2020-08-18T23:00:24+00:00

The legacy ethtool userspace tool shows an error when no features could be changed. It's useful to have a netlink reply to be able to show this error when __netdev_update_features wasn't called, for example: 1. ethtool -k eth0 large-receive-offload: off 2. ethtool -K eth0 rx-fcs on 3. ethtool -K eth0 lro on Could not change any device features rx-lro: off [requested on] 4. ethtool -K eth0 lro on # The output should be the same, but without this patch the kernel # doesn't send the reply, and ethtool is unable to detect the error. This commit makes ethtool-netlink always return a reply when requested, and it still avoids unnecessary calls to __netdev_update_features if the wanted features haven't changed. Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request") Signed-off-by: Maxim Mikityanskiy Reviewed-by: Michal Kubecek Signed-off-by: David S. Miller