if_link: Add additional parameter to IFLA_VF_INFO for spoof checking

Add configuration setting for drivers to turn spoof checking on or off
for discrete VFs.

v2 - Fix indentation problem, wrap the ifla_vf_info structure in
#ifdef __KERNEL__ to prevent user space from accessing and
change function paramater for the spoof check setting netdev
op from u8 to bool.
v3 - Preset spoof check setting to -1 so that user space tools such
as ip can detect that the driver didn't report a spoofcheck
setting. Prevents incorrect display of spoof check settings
for drivers that don't report it.

Signed-off-by: Greg Rose <[e-mail]>
Signed-off-by: Jeff Kirsher <[e-mail]>

include/linux/if_link.h

···
 	IFLA_VF_MAC,		/* Hardware queue specific attributes */
 	IFLA_VF_VLAN,
 	IFLA_VF_TX_RATE,	/* TX Bandwidth Allocation */
+	IFLA_VF_SPOOFCHK,	/* Spoof Checking on/off switch */
 	__IFLA_VF_MAX,
 };
 
···
 	__u32 rate; /* Max TX bandwidth in Mbps, 0 disables throttling */
 };
 
+struct ifla_vf_spoofchk {
+	__u32 vf;
+	__u32 setting;
+};
+#ifdef __KERNEL__
+
+/* We don't want this structure exposed to user space */
 struct ifla_vf_info {
 	__u32 vf;
 	__u8 mac[32];
 	__u32 vlan;
 	__u32 qos;
 	__u32 tx_rate;
+	__u32 spoofchk;
 };
+#endif
 
 /* VF ports management section
  *

include/linux/netdevice.h

···
  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
  * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
+ * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
  * int (*ndo_get_vf_config)(struct net_device *dev,
  *			    int vf, struct ifla_vf_info *ivf);
  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
···
 						   int queue, u16 vlan, u8 qos);
 	int			(*ndo_set_vf_tx_rate)(struct net_device *dev,
 						      int vf, int rate);
+	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
+						       int vf, bool setting);
 	int			(*ndo_get_vf_config)(struct net_device *dev,
 						     int vf,
 						     struct ifla_vf_info *ivf);

net/core/rtnetlink.c

···
 		size += num_vfs *
 			(nla_total_size(sizeof(struct ifla_vf_mac)) +
 			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
-			 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
+			 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
+			 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
 		return size;
 	} else
 		return 0;
···
 			struct ifla_vf_mac vf_mac;
 			struct ifla_vf_vlan vf_vlan;
 			struct ifla_vf_tx_rate vf_tx_rate;
+			struct ifla_vf_spoofchk vf_spoofchk;
+
+			/*
+			 * Not all SR-IOV capable drivers support the
+			 * spoofcheck query.  Preset to -1 so the user
+			 * space tool can detect that the driver didn't
+			 * report anything.
+			 */
+			ivi.spoofchk = -1;
 			if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 				break;
-			vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
+			vf_mac.vf =
+				vf_vlan.vf =
+				vf_tx_rate.vf =
+				vf_spoofchk.vf = ivi.vf;
+
 			memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 			vf_vlan.vlan = ivi.vlan;
 			vf_vlan.qos = ivi.qos;
 			vf_tx_rate.rate = ivi.tx_rate;
+			vf_spoofchk.setting = ivi.spoofchk;
 			vf = nla_nest_start(skb, IFLA_VF_INFO);
 			if (!vf) {
 				nla_nest_cancel(skb, vfinfo);
···
 			}
 			NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
 			NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
-			NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
+			NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
+				&vf_tx_rate);
+			NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
+				&vf_spoofchk);
 			nla_nest_end(skb, vf);
 		}
 		nla_nest_end(skb, vfinfo);
···
 			if (ops->ndo_set_vf_tx_rate)
 				err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
 							      ivt->rate);
+			break;
+		}
+		case IFLA_VF_SPOOFCHK: {
+			struct ifla_vf_spoofchk *ivs;
+			ivs = nla_data(vf);
+			err = -EOPNOTSUPP;
+			if (ops->ndo_set_vf_spoofchk)
+				err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
+							       ivs->setting);
 			break;
 		}
 		default: