netdev - Re: [PATCH iproute2-next v2 5/8] dcb: rewr: add new dcb-rewr subcommand

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Date: Wed, 31 May 2023 08:14:51 +0000
From: Daniel Machon <daniel.machon@...rochip.com>
To: Petr Machata <petrm@...dia.com>
CC: <netdev@...r.kernel.org>, <dsahern@...nel.org>,
	<stephen@...workplumber.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH iproute2-next v2 5/8] dcb: rewr: add new dcb-rewr
 subcommand

 > Daniel Machon <daniel.machon@...rochip.com> writes:
> 
> > Add a new subcommand 'rewr' for configuring the in-kernel DCB rewrite
> > table. The rewr-table of the kernel is similar to the APP-table, and so
> > is this new subcommand. Therefore, much of the existing bookkeeping code
> > from dcb-app, can be reused in the dcb-rewr implementation.
> >
> > Initially, only support for configuring PCP and DSCP-based rewrite has
> > been added.
> >
> > Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
> 
> Looks good overall, barring the comment about dcb_app_parse_mapping_cb()
> that I made in the other patch, and a handful of nits below.
> 
> > ---
> >  dcb/Makefile   |   3 +-
> >  dcb/dcb.c      |   4 +-
> >  dcb/dcb.h      |  32 ++++++
> >  dcb/dcb_app.c  |  49 ++++----
> >  dcb/dcb_rewr.c | 355 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  5 files changed, 416 insertions(+), 27 deletions(-)
> 
> > diff --git a/dcb/dcb.h b/dcb/dcb.h
> > index b3bc30cd02c5..092dc90e8358 100644
> > --- a/dcb/dcb.h
> > +++ b/dcb/dcb.h
> > @@ -54,6 +54,10 @@ void dcb_print_array_on_off(const __u8 *array, size_t size);
> >  void dcb_print_array_kw(const __u8 *array, size_t array_size,
> >                       const char *const kw[], size_t kw_size);
> >
> > +/* dcp_rewr.c */
> > +
> > +int dcb_cmd_rewr(struct dcb *dcb, int argc, char **argv);
> > +
> >  /* dcb_app.c */
> >
> >  struct dcb_app_table {
> > @@ -70,8 +74,29 @@ struct dcb_app_parse_mapping {
> >       int err;
> >  };
> >
> > +#define DCB_APP_PCP_MAX 15
> 
> This should be removed from dcb_app.c as well.
> 
> > +#define DCB_APP_DSCP_MAX 63
> 
> DCB_APP_DSCP_MAX should be introduced in a separate patch together with
> the s/63/DCB_APP_DSCP_MAX/ of the existing code, instead of including it
> all here. It's a concern separate from the main topic of the patch.

Ack.

> 
> > +
> >  int dcb_cmd_app(struct dcb *dcb, int argc, char **argv);
> >
> > +int dcb_app_get(struct dcb *dcb, const char *dev, struct dcb_app_table *tab);
> > +int dcb_app_add_del(struct dcb *dcb, const char *dev, int command,
> > +                 const struct dcb_app_table *tab,
> > +                 bool (*filter)(const struct dcb_app *));
> > +
> > +bool dcb_app_is_dscp(const struct dcb_app *app);
> > +bool dcb_app_is_pcp(const struct dcb_app *app);
> > +
> > +int dcb_app_print_pid_dscp(__u16 protocol);
> > +int dcb_app_print_pid_pcp(__u16 protocol);
> > +int dcb_app_print_pid_dec(__u16 protocol);
> > +void dcb_app_print_filtered(const struct dcb_app_table *tab,
> > +                         bool (*filter)(const struct dcb_app *),
> > +                         void (*print_pid_prio)(int (*print_pid)(__u16),
> > +                                                const struct dcb_app *),
> > +                         int (*print_pid)(__u16 protocol),
> > +                         const char *json_name, const char *fp_name);
> > +
> >  enum ieee_attrs_app dcb_app_attr_type_get(__u8 selector);
> >  bool dcb_app_attr_type_validate(enum ieee_attrs_app type);
> >  bool dcb_app_selector_validate(enum ieee_attrs_app type, __u8 selector);
> > @@ -80,11 +105,18 @@ bool dcb_app_pid_eq(const struct dcb_app *aa, const struct dcb_app *ab);
> >  bool dcb_app_prio_eq(const struct dcb_app *aa, const struct dcb_app *ab);
> >
> >  int dcb_app_table_push(struct dcb_app_table *tab, struct dcb_app *app);
> > +int dcb_app_table_copy(struct dcb_app_table *a, const struct dcb_app_table *b);
> > +void dcb_app_table_sort(struct dcb_app_table *tab);
> > +void dcb_app_table_fini(struct dcb_app_table *tab);
> > +void dcb_app_table_remove_existing(struct dcb_app_table *a,
> > +                                const struct dcb_app_table *b);
> >  void dcb_app_table_remove_replaced(struct dcb_app_table *a,
> >                                  const struct dcb_app_table *b,
> >                                  bool (*key_eq)(const struct dcb_app *aa,
> >                                                 const struct dcb_app *ab));
> >
> > +int dcb_app_parse_pcp(__u32 *key, const char *arg);
> > +int dcb_app_parse_dscp(__u32 *key, const char *arg);
> >  void dcb_app_parse_mapping_cb(__u32 key, __u64 value, void *data);
> >
> >  /* dcb_apptrust.c */
> > diff --git a/dcb/dcb_app.c b/dcb/dcb_app.c
> > index 97cba658aa6b..3cb1bb302ed6 100644
> > --- a/dcb/dcb_app.c
> > +++ b/dcb/dcb_app.c
> 
> > @@ -643,9 +642,9 @@ static int dcb_app_add_del_cb(struct dcb *dcb, struct nlmsghdr *nlh, void *data)
> 
> > +static int dcb_cmd_rewr_replace(struct dcb *dcb, const char *dev, int argc,
> > +                             char **argv)
> > +{
> 
> [...]
> 
> > +}
> > +
> > +
> 
> Two blank lines.
> 
> > +static int dcb_cmd_rewr_show(struct dcb *dcb, const char *dev, int argc,
> > +                          char **argv)
> > +{