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Date: Thu, 8 Jun 2017 11:29:57 +0200
From: Ivan Vecera <ivecera@...hat.com>
To: Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc: davem@...emloft.net, idosch@...lanox.com, arkadis@...lanox.com,
mlxsw@...lanox.com, roopa@...ulusnetworks.com,
stephen@...workplumber.org, nikolay@...ulusnetworks.com
Subject: Re: [patch net-next v2 02/19] net: bridge: Add support for offloading
port attributes
On 8.6.2017 08:44, Jiri Pirko wrote:
> From: Arkadi Sharshevsky <arkadis@...lanox.com>
>
> Currently the flood, learning and learning_sync port attributes are
> offloaded by setting the SELF flag. Add support for offloading the
> flood and learning attribute through the bridge code. In case of
> setting an unsupported flag on a offloded port the operation will
> fail.
>
> The learning_sync attribute doesn't have any software representation
> and cannot be offloaded through the bridge code.
>
> Signed-off-by: Arkadi Sharshevsky <arkadis@...lanox.com>
> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
> net/bridge/br_netlink.c | 87 +++++++++++++++++++++++++++++++++++------------
> net/bridge/br_private.h | 10 ++++++
> net/bridge/br_switchdev.c | 43 +++++++++++++++++++++++
> 3 files changed, 119 insertions(+), 21 deletions(-)
>
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 3bcda55..63dca34 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -662,16 +662,26 @@ static int br_set_port_state(struct net_bridge_port *p, u8 state)
> }
>
> /* Set/clear or port flags based on attribute */
> -static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
> - int attrtype, unsigned long mask)
> +static int br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
> + int attrtype, unsigned long mask)
> {
> - if (tb[attrtype]) {
> - u8 flag = nla_get_u8(tb[attrtype]);
> - if (flag)
> - p->flags |= mask;
> - else
> - p->flags &= ~mask;
> - }
> + unsigned long flags;
> + int err;
> +
> + if (!tb[attrtype])
> + return 0;
> +
> + if (nla_get_u8(tb[attrtype]))
> + flags = p->flags | mask;
> + else
> + flags = p->flags & ~mask;
> +
> + err = br_switchdev_set_port_flag(p, flags, mask);
> + if (err)
> + return err;
> +
> + p->flags = flags;
> + return 0;
> }
>
> /* Process bridge protocol info on port */
> @@ -681,20 +691,55 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
> bool br_vlan_tunnel_old = false;
> int err;
>
> - br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
> - br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
> - br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
> - br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST);
> - br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
> + if (err)
> + return err;
> +
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
> + if (err)
> + return err;
>
> br_vlan_tunnel_old = (p->flags & BR_VLAN_TUNNEL) ? true : false;
> - br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
> + err = br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
> + if (err)
> + return err;
> +
> if (br_vlan_tunnel_old && !(p->flags & BR_VLAN_TUNNEL))
> nbp_vlan_tunnel_info_flush(p);
>
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 2062692..7f43992 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -1076,6 +1076,9 @@ void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
> struct sk_buff *skb);
> bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
> const struct sk_buff *skb);
> +int br_switchdev_set_port_flag(struct net_bridge_port *p,
> + unsigned long flags,
> + unsigned long mask);
> #else
> static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
> {
> @@ -1092,6 +1095,13 @@ static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
> {
> return true;
> }
> +
> +static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
> + unsigned long flags,
> + unsigned long mask)
> +{
> + return 0;
> +}
> #endif /* CONFIG_NET_SWITCHDEV */
>
> #endif
> diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
> index f4097b9..b975959 100644
> --- a/net/bridge/br_switchdev.c
> +++ b/net/bridge/br_switchdev.c
> @@ -55,3 +55,46 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
> return !skb->offload_fwd_mark ||
> BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
> }
> +
> +/* Flags that can be offloaded to hardware */
> +#define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
> + BR_MCAST_FLOOD | BR_BCAST_FLOOD)
> +
> +int br_switchdev_set_port_flag(struct net_bridge_port *p,
> + unsigned long flags,
> + unsigned long mask)
> +{
> + struct switchdev_attr attr = {
> + .orig_dev = p->dev,
> + .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
> + };
> + int err;
> +
> + if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
> + return 0;
> +
> + err = switchdev_port_attr_get(p->dev, &attr);
> + if (err == -EOPNOTSUPP)
> + return 0;
> + if (err)
> + return err;
> +
> + /* Check if specific bridge flag attribute offload is supported */
> + if (!(attr.u.brport_flags_support & mask)) {
> + br_warn(p->br, "bridge flag offload is not supported %u(%s)\n",
> + (unsigned int)p->port_no, p->dev->name);
> + return -EOPNOTSUPP;
> + }
> +
> + attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
> + attr.flags = SWITCHDEV_F_DEFER;
> + attr.u.brport_flags = flags;
> + err = switchdev_port_attr_set(p->dev, &attr);
> + if (err) {
> + br_warn(p->br, "error setting offload flag on port %u(%s)\n",
> + (unsigned int)p->port_no, p->dev->name);
> + return err;
> + }
> +
> + return 0;
> +}
>
Reviewed-by: Ivan Vecera <ivecera@...hat.com>
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