[net-next v5 07/17] i40e: Implementation of VXLAN ndo's

[Jeff Kirsher <jeffrey.t.kirsher@intel.com>]

This adds the implementation for the VXLAN ndo's.  This allows the
hardware to do RX checksum offload for inner packets on the UDP ports
that VXLAN notifies us about.

Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/Kconfig                |  13 ++
 drivers/net/ethernet/intel/i40e/i40e.h            |  10 +-
 drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h |   1 +
 drivers/net/ethernet/intel/i40e/i40e_common.c     |  57 ++++++++
 drivers/net/ethernet/intel/i40e/i40e_main.c       | 157 ++++++++++++++++++++++
 drivers/net/ethernet/intel/i40e/i40e_prototype.h  |   6 +
 drivers/net/ethernet/intel/i40e/i40e_type.h       |   1 +
 7 files changed, 244 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
index 94adb89..9fb2eb8 100644
--- a/drivers/net/ethernet/intel/Kconfig
+++ b/drivers/net/ethernet/intel/Kconfig
@@ -259,6 +259,19 @@ config I40E
 	  To compile this driver as a module, choose M here. The module
 	  will be called i40e.
 
+config I40E_VXLAN
+	bool "Virtual eXtensible Local Area Network Support"
+	default n
+	depends on I40E && VXLAN && !(I40E=y && VXLAN=m)
+	---help---
+	  This allows one to create VXLAN virtual interfaces that provide
+	  Layer 2 Networks over Layer 3 Networks. VXLAN is often used
+	  to tunnel virtual network infrastructure in virtualized environments.
+	  Say Y here if you want to use Virtual eXtensible Local Area Network
+	  (VXLAN) in the driver.
+
+	  If unsure, say N.
+
 config I40EVF
 	tristate "Intel(R) XL710 X710 Virtual Function Ethernet support"
 	depends on PCI_MSI
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 31dd265..6f1edc1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -207,6 +207,11 @@ struct i40e_pf {
 	u8 atr_sample_rate;
 	bool wol_en;
 
+#ifdef CONFIG_I40E_VXLAN
+	__be16  vxlan_ports[I40E_MAX_PF_UDP_OFFLOAD_PORTS];
+	u16 pending_vxlan_bitmap;
+
+#endif
 	enum i40e_interrupt_policy int_policy;
 	u16 rx_itr_default;
 	u16 tx_itr_default;
@@ -238,7 +243,10 @@ struct i40e_pf {
 #define I40E_FLAG_DCB_ENABLED                  (u64)(1 << 21)
 #define I40E_FLAG_FDIR_ENABLED                 (u64)(1 << 22)
 #define I40E_FLAG_FDIR_ATR_ENABLED             (u64)(1 << 23)
-#define I40E_FLAG_MFP_ENABLED                  (u64)(1 << 27)
+#define I40E_FLAG_MFP_ENABLED                  (u64)(1 << 26)
+#ifdef CONFIG_I40E_VXLAN
+#define I40E_FLAG_VXLAN_FILTER_SYNC            (u64)(1 << 27)
+#endif
 
 	u16 num_tx_queues;
 	u16 num_rx_queues;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h b/drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h
index e61ebdd..2859377 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h
@@ -1918,6 +1918,7 @@ struct i40e_aqc_add_udp_tunnel {
 	u8     protocol_index;
 #define I40E_AQC_TUNNEL_TYPE_MAC    0x0
 #define I40E_AQC_TUNNEL_TYPE_UDP    0x1
+#define I40E_AQC_TUNNEL_TYPE_VXLAN  0x2
 	u8     reserved[12];
 };
 
diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index a69959e..e9aab1c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -1671,6 +1671,63 @@ i40e_status i40e_aq_start_lldp(struct i40e_hw *hw,
 }
 
 /**
+ * i40e_aq_add_udp_tunnel
+ * @hw: pointer to the hw struct
+ * @udp_port: the UDP port to add
+ * @header_len: length of the tunneling header length in DWords
+ * @protocol_index: protocol index type
+ * @cmd_details: pointer to command details structure or NULL
+ **/
+i40e_status i40e_aq_add_udp_tunnel(struct i40e_hw *hw,
+				u16 udp_port, u8 header_len,
+				u8 protocol_index, u8 *filter_index,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_add_udp_tunnel *cmd =
+		(struct i40e_aqc_add_udp_tunnel *)&desc.params.raw;
+	struct i40e_aqc_del_udp_tunnel_completion *resp =
+		(struct i40e_aqc_del_udp_tunnel_completion *)&desc.params.raw;
+	i40e_status status;
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_add_udp_tunnel);
+
+	cmd->udp_port = cpu_to_le16(udp_port);
+	cmd->header_len = header_len;
+	cmd->protocol_index = protocol_index;
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	if (!status)
+		*filter_index = resp->index;
+
+	return status;
+}
+
+/**
+ * i40e_aq_del_udp_tunnel
+ * @hw: pointer to the hw struct
+ * @index: filter index
+ * @cmd_details: pointer to command details structure or NULL
+ **/
+i40e_status i40e_aq_del_udp_tunnel(struct i40e_hw *hw, u8 index,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_remove_udp_tunnel *cmd =
+		(struct i40e_aqc_remove_udp_tunnel *)&desc.params.raw;
+	i40e_status status;
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_del_udp_tunnel);
+
+	cmd->index = index;
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	return status;
+}
+
+/**
  * i40e_aq_delete_element - Delete switch element
  * @hw: pointer to the hw struct
  * @seid: the SEID to delete from the switch
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b0cfb4c..97add1f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -27,6 +27,9 @@
 
 /* Local includes */
 #include "i40e.h"
+#ifdef CONFIG_I40E_VXLAN
+#include <net/vxlan.h>
+#endif
 
 const char i40e_driver_name[] = "i40e";
 static const char i40e_driver_string[] =
@@ -3993,6 +3996,9 @@ static int i40e_open(struct net_device *netdev)
 				    "couldn't set broadcast err %d aq_err %d\n",
 				    err, pf->hw.aq.asq_last_status);
 	}
+#ifdef CONFIG_I40E_VXLAN
+	vxlan_get_rx_port(netdev);
+#endif
 
 	return 0;
 
@@ -5016,6 +5022,52 @@ static void i40e_handle_mdd_event(struct i40e_pf *pf)
 	i40e_flush(hw);
 }
 
+#ifdef CONFIG_I40E_VXLAN
+/**
+ * i40e_sync_vxlan_filters_subtask - Sync the VSI filter list with HW
+ * @pf: board private structure
+ **/
+static void i40e_sync_vxlan_filters_subtask(struct i40e_pf *pf)
+{
+	const int vxlan_hdr_qwords = 4;
+	struct i40e_hw *hw = &pf->hw;
+	i40e_status ret;
+	u8 filter_index;
+	__be16 port;
+	int i;
+
+	if (!(pf->flags & I40E_FLAG_VXLAN_FILTER_SYNC))
+		return;
+
+	pf->flags &= ~I40E_FLAG_VXLAN_FILTER_SYNC;
+
+	for (i = 0; i < I40E_MAX_PF_UDP_OFFLOAD_PORTS; i++) {
+		if (pf->pending_vxlan_bitmap & (1 << i)) {
+			pf->pending_vxlan_bitmap &= ~(1 << i);
+			port = pf->vxlan_ports[i];
+			ret = port ?
+			      i40e_aq_add_udp_tunnel(hw, ntohs(port),
+						     vxlan_hdr_qwords,
+						     I40E_AQC_TUNNEL_TYPE_VXLAN,
+						     &filter_index, NULL)
+			      : i40e_aq_del_udp_tunnel(hw, i, NULL);
+
+			if (ret) {
+				dev_info(&pf->pdev->dev, "Failed to execute AQ command for %s port %d with index %d\n",
+					 port ? "adding" : "deleting",
+					 ntohs(port), port ? i : i);
+
+				pf->vxlan_ports[i] = 0;
+			} else {
+				dev_info(&pf->pdev->dev, "%s port %d with AQ command with index %d\n",
+					 port ? "Added" : "Deleted",
+					 ntohs(port), port ? i : filter_index);
+			}
+		}
+	}
+}
+
+#endif
 /**
  * i40e_service_task - Run the driver's async subtasks
  * @work: pointer to work_struct containing our data
@@ -5034,6 +5086,9 @@ static void i40e_service_task(struct work_struct *work)
 	i40e_fdir_reinit_subtask(pf);
 	i40e_check_hang_subtask(pf);
 	i40e_sync_filters_subtask(pf);
+#ifdef CONFIG_I40E_VXLAN
+	i40e_sync_vxlan_filters_subtask(pf);
+#endif
 	i40e_clean_adminq_subtask(pf);
 
 	i40e_service_event_complete(pf);
@@ -5900,6 +5955,104 @@ static int i40e_set_features(struct net_device *netdev,
 	return 0;
 }
 
+#ifdef CONFIG_I40E_VXLAN
+/**
+ * i40e_get_vxlan_port_idx - Lookup a possibly offloaded for Rx UDP port
+ * @pf: board private structure
+ * @port: The UDP port to look up
+ *
+ * Returns the index number or I40E_MAX_PF_UDP_OFFLOAD_PORTS if port not found
+ **/
+static u8 i40e_get_vxlan_port_idx(struct i40e_pf *pf, __be16 port)
+{
+	u8 i;
+
+	for (i = 0; i < I40E_MAX_PF_UDP_OFFLOAD_PORTS; i++) {
+		if (pf->vxlan_ports[i] == port)
+			return i;
+	}
+
+	return i;
+}
+
+/**
+ * i40e_add_vxlan_port - Get notifications about VXLAN ports that come up
+ * @netdev: This physical port's netdev
+ * @sa_family: Socket Family that VXLAN is notifying us about
+ * @port: New UDP port number that VXLAN started listening to
+ **/
+static void i40e_add_vxlan_port(struct net_device *netdev,
+				sa_family_t sa_family, __be16 port)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_pf *pf = vsi->back;
+	u8 next_idx;
+	u8 idx;
+
+	if (sa_family == AF_INET6)
+		return;
+
+	idx = i40e_get_vxlan_port_idx(pf, port);
+
+	/* Check if port already exists */
+	if (idx < I40E_MAX_PF_UDP_OFFLOAD_PORTS) {
+		netdev_info(netdev, "Port %d already offloaded\n", ntohs(port));
+		return;
+	}
+
+	/* Now check if there is space to add the new port */
+	next_idx = i40e_get_vxlan_port_idx(pf, 0);
+
+	if (next_idx == I40E_MAX_PF_UDP_OFFLOAD_PORTS) {
+		netdev_info(netdev, "Maximum number of UDP ports reached, not adding port %d\n",
+			    ntohs(port));
+		return;
+	}
+
+	/* New port: add it and mark its index in the bitmap */
+	pf->vxlan_ports[next_idx] = port;
+	pf->pending_vxlan_bitmap |= (1 << next_idx);
+
+	pf->flags |= I40E_FLAG_VXLAN_FILTER_SYNC;
+}
+
+/**
+ * i40e_del_vxlan_port - Get notifications about VXLAN ports that go away
+ * @netdev: This physical port's netdev
+ * @sa_family: Socket Family that VXLAN is notifying us about
+ * @port: UDP port number that VXLAN stopped listening to
+ **/
+static void i40e_del_vxlan_port(struct net_device *netdev,
+				sa_family_t sa_family, __be16 port)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_pf *pf = vsi->back;
+	u8 idx;
+
+	if (sa_family == AF_INET6)
+		return;
+
+	idx = i40e_get_vxlan_port_idx(pf, port);
+
+	/* Check if port already exists */
+	if (idx < I40E_MAX_PF_UDP_OFFLOAD_PORTS) {
+		/* if port exists, set it to 0 (mark for deletion)
+		 * and make it pending
+		 */
+		pf->vxlan_ports[idx] = 0;
+
+		pf->pending_vxlan_bitmap |= (1 << idx);
+
+		pf->flags |= I40E_FLAG_VXLAN_FILTER_SYNC;
+	} else {
+		netdev_warn(netdev, "Port %d was not found, not deleting\n",
+			    ntohs(port));
+	}
+}
+
+#endif
 static const struct net_device_ops i40e_netdev_ops = {
 	.ndo_open		= i40e_open,
 	.ndo_stop		= i40e_close,
@@ -5921,6 +6074,10 @@ static const struct net_device_ops i40e_netdev_ops = {
 	.ndo_set_vf_vlan	= i40e_ndo_set_vf_port_vlan,
 	.ndo_set_vf_tx_rate	= i40e_ndo_set_vf_bw,
 	.ndo_get_vf_config	= i40e_ndo_get_vf_config,
+#ifdef CONFIG_I40E_VXLAN
+	.ndo_add_vxlan_port	= i40e_add_vxlan_port,
+	.ndo_del_vxlan_port	= i40e_del_vxlan_port,
+#endif
 };
 
 /**
diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
index db7bf93..5c458bb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
@@ -157,6 +157,12 @@ i40e_status i40e_aq_stop_lldp(struct i40e_hw *hw, bool shutdown_agent,
 				struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_start_lldp(struct i40e_hw *hw,
 				struct i40e_asq_cmd_details *cmd_details);
+i40e_status i40e_aq_add_udp_tunnel(struct i40e_hw *hw,
+				u16 udp_port, u8 header_len,
+				u8 protocol_index, u8 *filter_index,
+				struct i40e_asq_cmd_details *cmd_details);
+i40e_status i40e_aq_del_udp_tunnel(struct i40e_hw *hw, u8 index,
+				struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_delete_element(struct i40e_hw *hw, u16 seid,
 				struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_mac_address_write(struct i40e_hw *hw,
diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
index 8bf1cac..b3a659c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
@@ -59,6 +59,7 @@
 #define I40E_MAX_VSI_QP			16
 #define I40E_MAX_VF_VSI			3
 #define I40E_MAX_CHAINED_RX_BUFFERS	5
+#define I40E_MAX_PF_UDP_OFFLOAD_PORTS	16
 
 /* Max default timeout in ms, */
 #define I40E_MAX_NVM_TIMEOUT		18000
-- 
1.8.3.1