net/mlx4: Add VF vlan protocol 802.1ad support

Move the vf to VST 802.1ad mode (mlx4 VST QinQ mode) by setting vf vlan
protocol to 802.1ad.
VST 802.1ad mode in mlx4, is used for STAG strip/insertion by PF, while
the CTAG is set by the VF.
Read current vlan protocol as part of the vf configuration state.

Upon setting vf vlan protocol to 802.1ad, we use a mechanism of handshake
to verify that both the vf and the pf driver version support it.
The handshake uses the command QUERY_FUNC_CAP:
- The vf sets a pre-defined support bit in input modifier.
- A pf that supports the feature sends the request to the vf through a
  pre-defined field in the output mailbox.
- In case vf does not support the feature, the pf will fail the control
  command (in this case, IP link tool command to set the vf vlan
  protocol to 802.1ad).

No change in VST 802.1Q mode.
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/cmd.c

@@ -1995,6 +1995,8 @@ static int mlx4_master_activate_admin_state(struct mlx4_priv *priv, int slave)
 	int port, err;
 	struct mlx4_vport_state *vp_admin;
 	struct mlx4_vport_oper_state *vp_oper;
+	struct mlx4_slave_state *slave_state =
+		&priv->mfunc.master.slave_state[slave];
 	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(
 			&priv->dev, slave);
 	int min_port = find_first_bit(actv_ports.ports,
@@ -2009,7 +2011,19 @@ static int mlx4_master_activate_admin_state(struct mlx4_priv *priv, int slave)
 			priv->mfunc.master.vf_admin[slave].enable_smi[port];
 		vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
 		vp_admin = &priv->mfunc.master.vf_admin[slave].vport[port];
-		vp_oper->state = *vp_admin;
+		if (vp_admin->vlan_proto != htons(ETH_P_8021AD) ||
+		    slave_state->vst_qinq_supported) {
+			vp_oper->state.vlan_proto   = vp_admin->vlan_proto;
+			vp_oper->state.default_vlan = vp_admin->default_vlan;
+			vp_oper->state.default_qos  = vp_admin->default_qos;
+		}
+		vp_oper->state.link_state = vp_admin->link_state;
+		vp_oper->state.mac        = vp_admin->mac;
+		vp_oper->state.spoofchk   = vp_admin->spoofchk;
+		vp_oper->state.tx_rate    = vp_admin->tx_rate;
+		vp_oper->state.qos_vport  = vp_admin->qos_vport;
+		vp_oper->state.guid       = vp_admin->guid;
+
 		if (MLX4_VGT != vp_admin->default_vlan) {
 			err = __mlx4_register_vlan(&priv->dev, port,
 						   vp_admin->default_vlan, &(vp_oper->vlan_idx));
@@ -2097,6 +2111,7 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd,
 		mlx4_warn(dev, "Received reset from slave:%d\n", slave);
 		slave_state[slave].active = false;
 		slave_state[slave].old_vlan_api = false;
+		slave_state[slave].vst_qinq_supported = false;
 		mlx4_master_deactivate_admin_state(priv, slave);
 		for (i = 0; i < MLX4_EVENT_TYPES_NUM; ++i) {
 				slave_state[slave].event_eq[i].eqn = -1;
@@ -2364,6 +2379,7 @@ int mlx4_multi_func_init(struct mlx4_dev *dev)
 			vf_oper = &priv->mfunc.master.vf_oper[i];
 			s_state = &priv->mfunc.master.slave_state[i];
 			s_state->last_cmd = MLX4_COMM_CMD_RESET;
+			s_state->vst_qinq_supported = false;
 			mutex_init(&priv->mfunc.master.gen_eqe_mutex[i]);
 			for (j = 0; j < MLX4_EVENT_TYPES_NUM; ++j)
 				s_state->event_eq[j].eqn = -1;
@@ -2955,10 +2971,13 @@ int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u64 mac)
 EXPORT_SYMBOL_GPL(mlx4_set_vf_mac);
 
 
-int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos)
+int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos,
+		     __be16 proto)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_vport_state *vf_admin;
+	struct mlx4_slave_state *slave_state;
+	struct mlx4_vport_oper_state *vf_oper;
 	int slave;
 
 	if ((!mlx4_is_master(dev)) ||
@@ -2968,12 +2987,31 @@ int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos)
 	if ((vlan > 4095) || (qos > 7))
 		return -EINVAL;
 
+	if (proto == htons(ETH_P_8021AD) &&
+	    !(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_SVLAN_BY_QP))
+		return -EPROTONOSUPPORT;
+
+	if (proto != htons(ETH_P_8021Q) &&
+	    proto != htons(ETH_P_8021AD))
+		return -EINVAL;
+
+	if ((proto == htons(ETH_P_8021AD)) &&
+	    ((vlan == 0) || (vlan == MLX4_VGT)))
+		return -EINVAL;
+
 	slave = mlx4_get_slave_indx(dev, vf);
 	if (slave < 0)
 		return -EINVAL;
 
+	slave_state = &priv->mfunc.master.slave_state[slave];
+	if ((proto == htons(ETH_P_8021AD)) && (slave_state->active) &&
+	    (!slave_state->vst_qinq_supported)) {
+		mlx4_err(dev, "vf %d does not support VST QinQ mode\n", vf);
+		return -EPROTONOSUPPORT;
+	}
 	port = mlx4_slaves_closest_port(dev, slave, port);
 	vf_admin = &priv->mfunc.master.vf_admin[slave].vport[port];
+	vf_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
 
 	if (!mlx4_valid_vf_state_change(dev, port, vf_admin, vlan, qos))
 		return -EPERM;
@@ -2983,6 +3021,7 @@ int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos)
 	else
 		vf_admin->default_vlan = vlan;
 	vf_admin->default_qos = qos;
+	vf_admin->vlan_proto = proto;
 
 	/* If rate was configured prior to VST, we saved the configured rate
 	 * in vf_admin->rate and now, if priority supported we enforce the QoS
@@ -2991,7 +3030,12 @@ int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos)
 	    vf_admin->tx_rate)
 		vf_admin->qos_vport = slave;
 
-	if (mlx4_master_immediate_activate_vlan_qos(priv, slave, port))
+	/* Try to activate new vf state without restart,
+	 * this option is not supported while moving to VST QinQ mode.
+	 */
+	if ((proto == htons(ETH_P_8021AD) &&
+	     vf_oper->state.vlan_proto != proto) ||
+	    mlx4_master_immediate_activate_vlan_qos(priv, slave, port))
 		mlx4_info(dev,
 			  "updating vf %d port %d config will take effect on next VF restart\n",
 			  vf, port);
@@ -3135,6 +3179,7 @@ int mlx4_get_vf_config(struct mlx4_dev *dev, int port, int vf, struct ifla_vf_in
 
 	ivf->vlan		= s_info->default_vlan;
 	ivf->qos		= s_info->default_qos;
+	ivf->vlan_proto		= s_info->vlan_proto;
 
 	if (mlx4_is_vf_vst_and_prio_qos(dev, port, s_info))
 		ivf->max_tx_rate = s_info->tx_rate;

drivers/net/ethernet/mellanox/mlx4/en_netdev.c

@@ -2406,10 +2406,8 @@ static int mlx4_en_set_vf_vlan(struct net_device *dev, int vf, u16 vlan, u8 qos,
 	struct mlx4_en_priv *en_priv = netdev_priv(dev);
 	struct mlx4_en_dev *mdev = en_priv->mdev;
 
-	if (vlan_proto != htons(ETH_P_8021Q))
-		return -EPROTONOSUPPORT;
-
-	return mlx4_set_vf_vlan(mdev->dev, en_priv->port, vf, vlan, qos);
+	return mlx4_set_vf_vlan(mdev->dev, en_priv->port, vf, vlan, qos,
+				vlan_proto);
 }
 
 static int mlx4_en_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,

drivers/net/ethernet/mellanox/mlx4/fw.c

@@ -249,6 +249,72 @@ int mlx4_QUERY_FUNC(struct mlx4_dev *dev, struct mlx4_func *func, int slave)
 	return err;
 }
 
+static int mlx4_activate_vst_qinq(struct mlx4_priv *priv, int slave, int port)
+{
+	struct mlx4_vport_oper_state *vp_oper;
+	struct mlx4_vport_state *vp_admin;
+	int err;
+
+	vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
+	vp_admin = &priv->mfunc.master.vf_admin[slave].vport[port];
+
+	if (vp_admin->default_vlan != vp_oper->state.default_vlan) {
+		err = __mlx4_register_vlan(&priv->dev, port,
+					   vp_admin->default_vlan,
+					   &vp_oper->vlan_idx);
+		if (err) {
+			vp_oper->vlan_idx = NO_INDX;
+			mlx4_warn(&priv->dev,
+				  "No vlan resources slave %d, port %d\n",
+				  slave, port);
+			return err;
+		}
+		mlx4_dbg(&priv->dev, "alloc vlan %d idx  %d slave %d port %d\n",
+			 (int)(vp_oper->state.default_vlan),
+			 vp_oper->vlan_idx, slave, port);
+	}
+	vp_oper->state.vlan_proto   = vp_admin->vlan_proto;
+	vp_oper->state.default_vlan = vp_admin->default_vlan;
+	vp_oper->state.default_qos  = vp_admin->default_qos;
+
+	return 0;
+}
+
+static int mlx4_handle_vst_qinq(struct mlx4_priv *priv, int slave, int port)
+{
+	struct mlx4_vport_oper_state *vp_oper;
+	struct mlx4_slave_state *slave_state;
+	struct mlx4_vport_state *vp_admin;
+	int err;
+
+	vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
+	vp_admin = &priv->mfunc.master.vf_admin[slave].vport[port];
+	slave_state = &priv->mfunc.master.slave_state[slave];
+
+	if ((vp_admin->vlan_proto != htons(ETH_P_8021AD)) ||
+	    (!slave_state->active))
+		return 0;
+
+	if (vp_oper->state.vlan_proto == vp_admin->vlan_proto &&
+	    vp_oper->state.default_vlan == vp_admin->default_vlan &&
+	    vp_oper->state.default_qos == vp_admin->default_qos)
+		return 0;
+
+	if (!slave_state->vst_qinq_supported) {
+		/* Warn and revert the request to set vst QinQ mode */
+		vp_admin->vlan_proto   = vp_oper->state.vlan_proto;
+		vp_admin->default_vlan = vp_oper->state.default_vlan;
+		vp_admin->default_qos  = vp_oper->state.default_qos;
+
+		mlx4_warn(&priv->dev,
+			  "Slave %d does not support VST QinQ mode\n", slave);
+		return 0;
+	}
+
+	err = mlx4_activate_vst_qinq(priv, slave, port);
+	return err;
+}
+
 int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 				struct mlx4_vhcr *vhcr,
 				struct mlx4_cmd_mailbox *inbox,
@@ -312,17 +378,18 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 #define QUERY_FUNC_CAP_VF_ENABLE_QP0		0x08
 
 #define QUERY_FUNC_CAP_FLAGS0_FORCE_PHY_WQE_GID 0x80
-#define QUERY_FUNC_CAP_SUPPORTS_NON_POWER_OF_2_NUM_EQS (1 << 31)
 #define QUERY_FUNC_CAP_PHV_BIT			0x40
 #define QUERY_FUNC_CAP_VLAN_OFFLOAD_DISABLE	0x20
 
+#define QUERY_FUNC_CAP_SUPPORTS_VST_QINQ	BIT(30)
+#define QUERY_FUNC_CAP_SUPPORTS_NON_POWER_OF_2_NUM_EQS BIT(31)
+
 	if (vhcr->op_modifier == 1) {
 		struct mlx4_active_ports actv_ports =
 			mlx4_get_active_ports(dev, slave);
 		int converted_port = mlx4_slave_convert_port(
 				dev, slave, vhcr->in_modifier);
-		struct mlx4_vport_oper_state *vp_oper =
-			&priv->mfunc.master.vf_oper[slave].vport[vhcr->in_modifier];
+		struct mlx4_vport_oper_state *vp_oper;
 
 		if (converted_port < 0)
 			return -EINVAL;
@@ -361,6 +428,11 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 		MLX4_PUT(outbox->buf, dev->caps.phys_port_id[vhcr->in_modifier],
 			 QUERY_FUNC_CAP_PHYS_PORT_ID);
 
+		vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
+		err = mlx4_handle_vst_qinq(priv, slave, port);
+		if (err)
+			return err;
+
 		field = 0;
 		if (dev->caps.phv_bit[port])
 			field |= QUERY_FUNC_CAP_PHV_BIT;
@@ -371,6 +443,9 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 	} else if (vhcr->op_modifier == 0) {
 		struct mlx4_active_ports actv_ports =
 			mlx4_get_active_ports(dev, slave);
+		struct mlx4_slave_state *slave_state =
+			&priv->mfunc.master.slave_state[slave];
+
 		/* enable rdma and ethernet interfaces, new quota locations,
 		 * and reserved lkey
 		 */
@@ -444,6 +519,10 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 
 		size = dev->caps.reserved_lkey + ((slave << 8) & 0xFF00);
 		MLX4_PUT(outbox->buf, size, QUERY_FUNC_CAP_QP_RESD_LKEY_OFFSET);
+
+		if (vhcr->in_modifier & QUERY_FUNC_CAP_SUPPORTS_VST_QINQ)
+			slave_state->vst_qinq_supported = true;
+
 	} else
 		err = -EINVAL;
 
@@ -459,10 +538,12 @@ int mlx4_QUERY_FUNC_CAP(struct mlx4_dev *dev, u8 gen_or_port,
 	u32			size, qkey;
 	int			err = 0, quotas = 0;
 	u32                     in_modifier;
+	u32			slave_caps;
 
 	op_modifier = !!gen_or_port; /* 0 = general, 1 = logical port */
-	in_modifier = op_modifier ? gen_or_port :
+	slave_caps = QUERY_FUNC_CAP_SUPPORTS_VST_QINQ |
 		QUERY_FUNC_CAP_SUPPORTS_NON_POWER_OF_2_NUM_EQS;
+	in_modifier = op_modifier ? gen_or_port : slave_caps;
 
 	mailbox = mlx4_alloc_cmd_mailbox(dev);
 	if (IS_ERR(mailbox))

drivers/net/ethernet/mellanox/mlx4/mlx4.h

@@ -483,6 +483,7 @@ struct mlx4_slave_state {
 	u8 init_port_mask;
 	bool active;
 	bool old_vlan_api;
+	bool vst_qinq_supported;
 	u8 function;
 	dma_addr_t vhcr_dma;
 	u16 mtu[MLX4_MAX_PORTS + 1];

include/linux/mlx4/cmd.h

@@ -309,7 +309,8 @@ int mlx4_get_vf_stats(struct mlx4_dev *dev, int port, int vf_idx,
 		      struct ifla_vf_stats *vf_stats);
 u32 mlx4_comm_get_version(void);
 int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u64 mac);
-int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan, u8 qos);
+int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan,
+		     u8 qos, __be16 proto);
 int mlx4_set_vf_rate(struct mlx4_dev *dev, int port, int vf, int min_tx_rate,
 		     int max_tx_rate);
 int mlx4_set_vf_spoofchk(struct mlx4_dev *dev, int port, int vf, bool setting);