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Message-ID: <ZtYJX2HTeiglkxUU@LQ3V64L9R2.station>
Date: Mon, 2 Sep 2024 20:52:15 +0200
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: mkarsten@...terloo.ca, Amritha Nambiar <amritha.nambiar@...el.com>,
stable@...nel.org, Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
Sridhar Samudrala <sridhar.samudrala@...el.com>,
Stanislav Fomichev <sdf@...ichev.me>,
Daniel Jurgens <danielj@...dia.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] netdev-genl: Set extack and fix error on napi-get
On Sat, Aug 31, 2024 at 12:17:04PM +0000, Joe Damato wrote:
> In commit 27f91aaf49b3 ("netdev-genl: Add netlink framework functions
> for napi"), when an invalid NAPI ID is specified the return value
> -EINVAL is used and no extack is set.
>
> Change the return value to -ENOENT and set the extack.
>
> Before this commit:
>
> $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
> --do napi-get --json='{"id": 451}'
> Netlink error: Invalid argument
> nl_len = 36 (20) nl_flags = 0x100 nl_type = 2
> error: -22
>
> After this commit:
>
> $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
> --do napi-get --json='{"id": 451}'
> Netlink error: No such file or directory
> nl_len = 44 (28) nl_flags = 0x300 nl_type = 2
> error: -2
> extack: {'bad-attr': '.id'}
>
> Cc: Amritha Nambiar <amritha.nambiar@...el.com>
> Cc: stable@...nel.org
> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi")
> Signed-off-by: Joe Damato <jdamato@...tly.com>
> ---
> net/core/netdev-genl.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
> index 05f9515d2c05..a17d7eaeb001 100644
> --- a/net/core/netdev-genl.c
> +++ b/net/core/netdev-genl.c
> @@ -216,10 +216,12 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
> rtnl_lock();
>
> napi = napi_by_id(napi_id);
> - if (napi)
> + if (napi) {
> err = netdev_nl_napi_fill_one(rsp, napi, info);
> - else
> - err = -EINVAL;
> + } else {
> + NL_SET_BAD_ATTR(info->extack, info->attrs[NETDEV_A_NAPI_ID]);
> + err = -ENOENT;
> + }
>
> rtnl_unlock();
>
> --
> 2.25.1
Based on Eric's comment regarding my other patch [1], I should
probably re-submit this against net-next instead of net.
It's been over 48 hours, but I'll wait a bit longer before
resubmitting.
[1]: https://lore.kernel.org/all/CANn89iLhrKyFKf9DpJSSM9CZ9sgoRo7jovg2GhjsJABoqzzVsQ@mail.gmail.com/
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