On Tue, Sep 08, 2020 at 09:33:42AM -0600, David Ahern wrote:
> On 9/8/20 3:10 AM, Ido Schimmel wrote:
> > From: Ido Schimmel <ido...@nvidia.com>
> >
> > When a single nexthop is deleted, the configuration of all the groups
> > using the nexthop is effectively modified. In this case, emit a
> > notification in the nexthop notification chain for each modified group
> > so that listeners would not need to keep track of which nexthops are
> > member in which groups.
> >
> > In the rare cases where the notification fails, emit an error to the
> > kernel log.
> >
> > Signed-off-by: Ido Schimmel <ido...@nvidia.com>
> > ---
> > net/ipv4/nexthop.c | 6 +++++-
> > 1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
> > index 0edc3e73d416..33f611bbce1f 100644
> > --- a/net/ipv4/nexthop.c
> > +++ b/net/ipv4/nexthop.c
> > @@ -893,7 +893,7 @@ static void remove_nh_grp_entry(struct net *net, struct
> > nh_grp_entry *nhge,
> > struct nexthop *nhp = nhge->nh_parent;
> > struct nexthop *nh = nhge->nh;
> > struct nh_group *nhg, *newg;
> > - int i, j;
> > + int i, j, err;
> >
> > WARN_ON(!nh);
> >
> > @@ -941,6 +941,10 @@ static void remove_nh_grp_entry(struct net *net,
> > struct nh_grp_entry *nhge,
> > list_del(&nhge->nh_list);
> > nexthop_put(nhge->nh);
> >
> > + err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, NULL);
> > + if (err)
> > + pr_err("Failed to replace nexthop group after nexthop
> > deletion\n");
>
> This should refer to the notifier failing since wrt nexthop code the
> structs are ok. extack on the stack and logging that message would be
> useful too (or have the users of the notifier log why it fails).
'extack on the stack' idea is cool! I will do that
>
> > +
> > if (nlinfo)
> > nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo);
> > }
> >
>
