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SubjectRe: [PATCH net-next v2 06/16] net: bridge: Stop calling switchdev_port_attr_get()
Date
On Sun, Feb 10, 2019 at 09:50:55AM -0800, Florian Fainelli wrote:
> Now that all switchdev drivers have been converted to checking the
> bridge port flags during the prepare phase of the
> switchdev_port_attr_set(), we can move straight to trying to set the
> desired flag through SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS.
>
> Acked-by: Jiri Pirko <jiri@mellanox.com>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> net/bridge/br_switchdev.c | 20 +++-----------------
> 1 file changed, 3 insertions(+), 17 deletions(-)
>
> diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
> index db9e8ab96d48..939f300522c5 100644
> --- a/net/bridge/br_switchdev.c
> +++ b/net/bridge/br_switchdev.c
> @@ -64,29 +64,15 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
> {
> struct switchdev_attr attr = {
> .orig_dev = p->dev,
> - .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
> + .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
> + .flags = SWITCHDEV_F_DEFER,

How does this work? You defer the operation, so the driver cannot veto
it. This is why we have SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT
which is not deferred.

> + .u.brport_flags = flags,
> };
> 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",
> --
> 2.19.1
>

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