RE: [RFC PATCH net-next v2 1/1] net: Support for switch port configuration

Varlese, Marco
2014-12-18T14:55:56Z

> -----Original Message-----
> From: Roopa Prabhu [mailto:roopa@cumulusnetworks.com]
> Sent: Thursday, December 18, 2014 2:45 PM
> To: Varlese, Marco
> Cc: netdev@vger.kernel.org; Fastabend, John R; Thomas Graf; Jiri Pirko;
> sfeldma@gmail.com; linux-kernel@vger.kernel.org
> Subject: Re: [RFC PATCH net-next v2 1/1] net: Support for switch port
> configuration
>
> On 12/18/14, 3:29 AM, Varlese, Marco wrote:
> > From: Marco Varlese <marco.varlese@intel.com>
> >
> > Switch hardware offers a list of attributes that are configurable on a
> > per port basis.
> > This patch provides a mechanism to configure switch ports by adding an
> > NDO for setting specific values to specific attributes.
> > There will be a separate patch that adds the "get" functionality via
> > another NDO and another patch that extends iproute2 to call the two
> > new NDOs.
> >
> > Signed-off-by: Marco Varlese <marco.varlese@intel.com>
> > ---
> > include/linux/netdevice.h | 5 ++++
> > include/uapi/linux/if_link.h | 15 ++++++++++++
> > net/core/rtnetlink.c | 54
> ++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 74 insertions(+)
> >
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index c31f74d..4881c7b 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -1027,6 +1027,9 @@ typedef u16 (*select_queue_fallback_t)(struct
> net_device *dev,
> > * int (*ndo_switch_port_stp_update)(struct net_device *dev, u8 state);
> > * Called to notify switch device port of bridge port STP
> > * state change.
> > + * int (*ndo_switch_port_set_cfg)(struct net_device *dev,
> > + * u32 attr, u64 value);
> > + * Called to set specific switch ports attributes.
> > */
> > struct net_device_ops {
> > int (*ndo_init)(struct net_device *dev);
> > @@ -1185,6 +1188,8 @@ struct net_device_ops {
> > struct
> netdev_phys_item_id *psid);
> > int (*ndo_switch_port_stp_update)(struct
> net_device *dev,
> > u8 state);
> > + int (*ndo_switch_port_set_cfg)(struct
> net_device *dev,
> > + u32 attr, u64 value);
> > #endif
> > };
> >
> > diff --git a/include/uapi/linux/if_link.h
> > b/include/uapi/linux/if_link.h index f7d0d2d..19cb51a 100644
> > --- a/include/uapi/linux/if_link.h
> > +++ b/include/uapi/linux/if_link.h
> > @@ -146,6 +146,7 @@ enum {
> > IFLA_PHYS_PORT_ID,
> > IFLA_CARRIER_CHANGES,
> > IFLA_PHYS_SWITCH_ID,
> > + IFLA_SWITCH_PORT_CFG,
> > __IFLA_MAX
> > };
> >
> > @@ -603,4 +604,18 @@ enum {
> >
> > #define IFLA_HSR_MAX (__IFLA_HSR_MAX - 1)
> >
> > +/* Switch Port Attributes section */
> > +
> > +enum {
> > + IFLA_ATTR_UNSPEC,
> > + IFLA_ATTR_LEARNING,
> Any reason you want learning here ?. This is covered as part of the bridge
> setlink attributes.
>

Yes, because the user may _not_ want to go through a bridge interface necessarily.

> > + IFLA_ATTR_LOOPBACK,
> > + IFLA_ATTR_BCAST_FLOODING,
> > + IFLA_ATTR_UCAST_FLOODING,
> > + IFLA_ATTR_MCAST_FLOODING,
> > + __IFLA_ATTR_MAX
> > +};
> > +
> > +#define IFLA_ATTR_MAX (__IFLA_ATTR_MAX - 1)
> > +
> > #endif /* _UAPI_LINUX_IF_LINK_H */
> > diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index
> > eaa057f..c0d1c45 100644
> > --- a/net/core/rtnetlink.c
> > +++ b/net/core/rtnetlink.c
> > @@ -1389,6 +1389,46 @@ static int validate_linkmsg(struct net_device
> *dev, struct nlattr *tb[])
> > return 0;
> > }
> >
> > +#ifdef CONFIG_NET_SWITCHDEV
> > +static int do_setswcfg(struct net_device *dev, struct nlattr *attr) {
> > + int rem, err = -EINVAL;
> > + struct nlattr *v;
> > + const struct net_device_ops *ops = dev->netdev_ops;
> > +
> > + nla_for_each_nested(v, attr, rem) {
> > + u32 op = nla_type(v);
> > + u64 value = 0;
> > +
> > + switch (op) {
> > + case IFLA_ATTR_LEARNING:
> > + case IFLA_ATTR_LOOPBACK:
> > + case IFLA_ATTR_BCAST_FLOODING:
> > + case IFLA_ATTR_UCAST_FLOODING:
> > + case IFLA_ATTR_MCAST_FLOODING: {
> > + if (nla_len(v) < sizeof(value)) {
> > + err = -EINVAL;
> > + break;
> > + }
> > +
> > + value = nla_get_u64(v);
> > + err = ops->ndo_switch_port_set_cfg(dev,
> > + op,
> > + value);
> > + break;
> > + }
> > + default:
> > + err = -EINVAL;
> > + break;
> > + }
> > + if (err)
> > + break;
> > + }
> > + return err;
> > +}
> > +
> > +#endif
> > +
> > static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
> > {
> > int rem, err = -EINVAL;
> > @@ -1740,6 +1780,20 @@ static int do_setlink(const struct sk_buff *skb,
> > status |= DO_SETLINK_NOTIFY;
> > }
> > }
> > +#ifdef CONFIG_NET_SWITCHDEV
> > + if (tb[IFLA_SWITCH_PORT_CFG]) {
> > + err = -EOPNOTSUPP;
> > + if (!ops->ndo_switch_port_set_cfg)
> > + goto errout;
> > + if (!ops->ndo_switch_parent_id_get)
> > + goto errout;
> > + err = do_setswcfg(dev, tb[IFLA_SWITCH_PORT_CFG]);
> > + if (err < 0)
> > + goto errout;
> > +
> > + status |= DO_SETLINK_NOTIFY;
> > + }
> > +#endif
> > err = 0;
> >