netdev - Re: [PATCH v2 net] bonding: add xdp

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Date:   Mon, 01 May 2023 14:56:52 +0200
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        andy@...yhouse.net, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, bpf@...r.kernel.org,
        andrii@...nel.org, mykolal@...com, ast@...nel.org,
        daniel@...earbox.net, martin.lau@...ux.dev, alardam@...il.com,
        memxor@...il.com, sdf@...gle.com, brouer@...hat.com,
        toke@...hat.com
Subject: Re: [PATCH v2 net] bonding: add xdp_features support

Lorenzo Bianconi <lorenzo@...nel.org> wrote:

>Introduce xdp_features support for bonding driver according to the slave
>devices attached to the master one. xdp_features is required whenever we
>want to xdp_redirect traffic into a bond device and then into selected
>slaves attached to it.
>
>Fixes: 66c0e13ad236 ("drivers: net: turn on XDP features")
>Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

	The patch looks ok to me, but the description sounds more like
feature enablement rather than a bug fix as the "Fixes:" tag and net
tree suggest.

Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>

	-J

>---
>Change since v1:
>- remove bpf self-test patch from the series
>---
> drivers/net/bonding/bond_main.c    | 48 ++++++++++++++++++++++++++++++
> drivers/net/bonding/bond_options.c |  2 ++
> include/net/bonding.h              |  1 +
> 3 files changed, 51 insertions(+)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 710548dbd0c1..c98121b426a4 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -1789,6 +1789,45 @@ static void bond_ether_setup(struct net_device *bond_dev)
> 	bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
> }
> 
>+void bond_xdp_set_features(struct net_device *bond_dev)
>+{
>+	struct bonding *bond = netdev_priv(bond_dev);
>+	xdp_features_t val = NETDEV_XDP_ACT_MASK;
>+	struct list_head *iter;
>+	struct slave *slave;
>+
>+	ASSERT_RTNL();
>+
>+	if (!bond_xdp_check(bond)) {
>+		xdp_clear_features_flag(bond_dev);
>+		return;
>+	}
>+
>+	bond_for_each_slave(bond, slave, iter) {
>+		struct net_device *dev = slave->dev;
>+
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_BASIC)) {
>+			xdp_clear_features_flag(bond_dev);
>+			return;
>+		}
>+
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_REDIRECT))
>+			val &= ~NETDEV_XDP_ACT_REDIRECT;
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT))
>+			val &= ~NETDEV_XDP_ACT_NDO_XMIT;
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY))
>+			val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY;
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_HW_OFFLOAD))
>+			val &= ~NETDEV_XDP_ACT_HW_OFFLOAD;
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_RX_SG))
>+			val &= ~NETDEV_XDP_ACT_RX_SG;
>+		if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT_SG))
>+			val &= ~NETDEV_XDP_ACT_NDO_XMIT_SG;
>+	}
>+
>+	xdp_set_features_flag(bond_dev, val);
>+}
>+
> /* enslave device <slave> to bond device <master> */
> int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
> 		 struct netlink_ext_ack *extack)
>@@ -2236,6 +2275,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
> 			bpf_prog_inc(bond->xdp_prog);
> 	}
> 
>+	bond_xdp_set_features(bond_dev);
>+
> 	slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
> 		   bond_is_active_slave(new_slave) ? "an active" : "a backup",
> 		   new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
>@@ -2483,6 +2524,7 @@ static int __bond_release_one(struct net_device *bond_dev,
> 	if (!netif_is_bond_master(slave_dev))
> 		slave_dev->priv_flags &= ~IFF_BONDING;
> 
>+	bond_xdp_set_features(bond_dev);
> 	kobject_put(&slave->kobj);
> 
> 	return 0;
>@@ -3930,6 +3972,9 @@ static int bond_slave_netdev_event(unsigned long event,
> 		/* Propagate to master device */
> 		call_netdevice_notifiers(event, slave->bond->dev);
> 		break;
>+	case NETDEV_XDP_FEAT_CHANGE:
>+		bond_xdp_set_features(bond_dev);
>+		break;
> 	default:
> 		break;
> 	}
>@@ -5874,6 +5919,9 @@ void bond_setup(struct net_device *bond_dev)
> 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
> 		bond_dev->features |= BOND_XFRM_FEATURES;
> #endif /* CONFIG_XFRM_OFFLOAD */
>+
>+	if (bond_xdp_check(bond))
>+		bond_dev->xdp_features = NETDEV_XDP_ACT_MASK;
> }
> 
> /* Destroy a bonding device.
>diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
>index f71d5517f829..0498fc6731f8 100644
>--- a/drivers/net/bonding/bond_options.c
>+++ b/drivers/net/bonding/bond_options.c
>@@ -877,6 +877,8 @@ static int bond_option_mode_set(struct bonding *bond,
> 			netdev_update_features(bond->dev);
> 	}
> 
>+	bond_xdp_set_features(bond->dev);
>+
> 	return 0;
> }
> 
>diff --git a/include/net/bonding.h b/include/net/bonding.h
>index c3843239517d..a60a24923b55 100644
>--- a/include/net/bonding.h
>+++ b/include/net/bonding.h
>@@ -659,6 +659,7 @@ void bond_destroy_sysfs(struct bond_net *net);
> void bond_prepare_sysfs_group(struct bonding *bond);
> int bond_sysfs_slave_add(struct slave *slave);
> void bond_sysfs_slave_del(struct slave *slave);
>+void bond_xdp_set_features(struct net_device *bond_dev);
> int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
> 		 struct netlink_ext_ack *extack);
> int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
>-- 
>2.40.0

---
	-Jay Vosburgh, jay.vosburgh@...onical.com