linux-kernel - Re: [PATCH net-next v2 5/8] net: netconsole: add a userdata config_group member to netconsole

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Message-ID: <CADvopvb1phuPW+M3L2BQ576vJgWx2zeFN943OxcVq+iTL8_3qA@mail.gmail.com>
Date: Fri, 2 Feb 2024 08:05:07 -0800
From: Matthew Wood <thepacketgeek@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, leitao@...ian.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/8] net: netconsole: add a userdata
 config_group member to netconsole_target

On Fri, Feb 2, 2024 at 3:52 AM Simon Horman <horms@...nel.org> wrote:
>
> On Fri, Jan 26, 2024 at 03:13:40PM -0800, Matthew Wood wrote:
> > Create configfs machinery for netconsole userdata appending, which depends
> > on CONFIG_NETCONSOLE_DYNAMIC (for configfs interface). Add a userdata
> > config_group to netconsole_target for managing userdata entries as a tree
> > under the netconsole configfs subsystem. Directory names created under the
> > userdata directory become userdatum keys; the userdatum value is the
> > content of the value file.
> >
> > Include the minimum-viable-changes for userdata configfs config_group.
> > init_target_config_group() ties in the complete configfs machinery to
> > avoid unused func/variable errors during build. Initializing the
> > netconsole_target->group is moved to init_target_config_group, which
> > will also init and add the userdata config_group.
> >
> > Each userdatum entry has a limit of 256 bytes (54 for
> > the key/directory, 200 for the value, and 2 for '=' and '\n'
> > characters), which is enforced by the configfs functions for updating
> > the userdata config_group.
> >
> > When a new netconsole_target is created, initialize the userdata
> > config_group and add it as a default group for netconsole_target
> > config_group, allowing the userdata configfs sub-tree to be presented
> > in the netconsole configfs tree under the userdata directory.
> >
> > Co-developed-by: Breno Leitao <leitao@...ian.org>
> > Signed-off-by: Breno Leitao <leitao@...ian.org>
> > Signed-off-by: Matthew Wood <thepacketgeek@...il.com>
>
> Hi Matthew,
>
> some minor feedback from my side, as it looks like there will be another
> revision of this patchset anyway.
>
> > ---
> >  drivers/net/netconsole.c | 143 +++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 139 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
>
> ...
>
> > @@ -596,6 +606,123 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
> >       return -EINVAL;
> >  }
> >
> > +struct userdatum {
> > +     struct config_item item;
> > +     char value[MAX_USERDATA_VALUE_LENGTH];
> > +};
> > +
> > +static inline struct userdatum *to_userdatum(struct config_item *item)
> > +{
> > +     return container_of(item, struct userdatum, item);
> > +}
>
> Please don't use the inline keyword in C files,
> unless there is a demonstrable reason to do so.
> Rather, please let the compiler inline code as is sees fit.
>
> ...
>
> > @@ -640,6 +767,14 @@ static const struct config_item_type netconsole_target_type = {
> >       .ct_owner               = THIS_MODULE,
> >  };
> >
> > +static void init_target_config_group(struct netconsole_target *nt, const char *name)
>
> nit: Networking still prefers code to be 80 columns wide or less.
>
> ...

Hi Simon,

I appreciate the review, thank you for the feedback. I've addressed
the comments here and in the other patches too. I'll be posting a v3
soon with the changes.