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Date: Mon, 5 Jun 2017 16:29:26 +0300
From: Nikolay Aleksandrov <nikolay@...ulusnetworks.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, ivecera@...hat.com
Subject: Re: [patch net-next 02/19] net: bridge: Add support for offloading
port attributes
On 05/06/17 12:20, 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 | 112 +++++++++++++++++++++++++++++++++++++++---------
> net/bridge/br_private.h | 4 ++
> 2 files changed, 96 insertions(+), 20 deletions(-)
>
Hi Arkadi,
A few comments below
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 1e63ec4..1afafb7 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -17,6 +17,7 @@
> #include <net/net_namespace.h>
> #include <net/sock.h>
> #include <uapi/linux/if_bridge.h>
> +#include <net/switchdev.h>
>
> #include "br_private.h"
> #include "br_private_stp.h"
> @@ -662,16 +663,52 @@ 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;
> + struct switchdev_attr attr = {
> + .orig_dev = p->dev,
> + .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
> + };
> + 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;
> +
> + if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
> + goto out;
> +
> + err = switchdev_port_attr_get(p->dev, &attr);
> + if (err == -EOPNOTSUPP)
> + goto out;
> + 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",
Why all caps (FLAG) ?
> + (unsigned int)p->port_no, p->dev->name);
> + return err;
> }
I think all of this switchdev-specific code should be contained into br_switchdev.c and
exported via some function. Anyone changing only the bridge can easily get confused.
> +out:
> + p->flags = flags;
> + return 0;
> }
>
> /* Process bridge protocol info on port */
> @@ -681,20 +718,55 @@ 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..5dc30ed 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -42,6 +42,10 @@
> /* Path to usermode spanning tree program */
> #define BR_STP_PROG "/sbin/bridge-stp"
>
> +/* Flags that can be offloaded to hardware */
> +#define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
> + BR_MCAST_FLOOD | BR_BCAST_FLOOD)
> +
> typedef struct bridge_id bridge_id;
> typedef struct mac_addr mac_addr;
> typedef __u16 port_id;
>
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