Thu, Oct 26, 2017 at 07:08:05AM CEST, dsah...@gmail.com wrote:
>Adding a FIB rule on a spectrum platform silently aborts FIB offload:
> $ ip ru add pref 99 from all to 192.168.1.1 table 10
> $ dmesg -c
> [ 623.144736] mlxsw_spectrum 0000:03:00.0: FIB abort triggered. Note that
> FIB entries are no longer being offloaded to this device.
>
>This patch reworks FIB rule handling to return a message to the user:
> $ ip ru add pref 99 from all to 8.8.8.8 table 11
> Error: spectrum: FIB rules not supported. Aborting offload.
>
>spectrum currently only checks whether the fib rule is a default rule or
>an l3mdev rule, both of which it knows how to handle. Any other it aborts
>FIB offload. Since the processing is fairly quick, move the code to inline
>with the user request rather than a work queue to allow a message to be
>returned if the offload is aborted. Change the delete handling to just return
>since it does nothing at the moment.
>
>Signed-off-by: David Ahern <dsah...@gmail.com>
>---
[...]
>+static int mlxsw_sp_router_fib_rule_event(unsigned long event,
>+ struct fib_notifier_info *info,
>+ struct mlxsw_sp *mlxsw_sp)
>+{
>+ struct netlink_ext_ack *extack = info->extack;
>+ struct fib_rule_notifier_info *fr_info;
>+ struct fib_rule *rule;
>+ bool add_unsupported_msg = false;
>+
>+ /* nothing to do at the moment */
>+ if (event == FIB_EVENT_RULE_DEL)
>+ goto out;
>+
>+ fr_info = container_of(info, struct fib_rule_notifier_info, info);
>+ rule = fr_info->rule;
>+
>+ switch (info->family) {
>+ case AF_INET:
>+ if (!fib4_rule_default(rule) && !rule->l3mdev) {
Why don't we abort on removal of default rule?
>+ add_unsupported_msg = true;
>+ mlxsw_sp_router_fib_abort(mlxsw_sp);
>+ }
>+ break;
>+ case AF_INET6:
>+ if (!fib6_rule_default(rule) && !rule->l3mdev) {
>+ add_unsupported_msg = true;
>+ mlxsw_sp_router_fib_abort(mlxsw_sp);
>+ }
>+ break;
>+ case RTNL_FAMILY_IPMR:
>+ if (!ipmr_rule_default(rule) && !rule->l3mdev) {
>+ add_unsupported_msg = true;
>+ mlxsw_sp_router_fib_abort(mlxsw_sp);
>+ }
> break;
