ixgbe: add VXLAN offload support for X550 devices

Add support VXLAN receive checksum offload in X550 hardware.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

4 files changed, 113 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
index 4d61ef50b465..f4ff465584a0 100644
--- a/drivers/net/ethernet/intel/Kconfig
+++ b/drivers/net/ethernet/intel/Kconfig
@@ -192,6 +192,17 @@ config IXGBE
           To compile this driver as a module, choose M here. The module
           will be called ixgbe.
 
+config IXGBE_VXLAN
+        bool "Virtual eXtensible Local Area Network Support"
+        default n
+        depends on IXGBE && VXLAN && !(IXGBE=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.
+
 config IXGBE_HWMON
         bool "Intel(R) 10GbE PCI Express adapters HWMON support"
         default y
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 38fc64cf5dca..699117aff5fe 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -753,6 +753,7 @@ struct ixgbe_adapter {
         u32 timer_event_accumulator;
         u32 vferr_refcount;
         struct ixgbe_mac_addr *mac_table;
+        u16 vxlan_port;
         struct kobject *info_kobj;
 #ifdef CONFIG_IXGBE_HWMON
         struct hwmon_buff *ixgbe_hwmon_buff;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index e9e3a1eb9a97..6aa9b96b2e10 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -50,6 +50,7 @@
 #include <linux/if_bridge.h>
 #include <linux/prefetch.h>
 #include <scsi/fc/fc_fcoe.h>
+#include <net/vxlan.h>
 
 #ifdef CONFIG_OF
 #include <linux/of_net.h>
@@ -1396,12 +1397,23 @@ static inline void ixgbe_rx_checksum(struct ixgbe_ring *ring,
                                      union ixgbe_adv_rx_desc *rx_desc,
                                      struct sk_buff *skb)
 {
+        __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
+        __le16 hdr_info = rx_desc->wb.lower.lo_dword.hs_rss.hdr_info;
+        bool encap_pkt = false;
+
         skb_checksum_none_assert(skb);
 
         /* Rx csum disabled */
         if (!(ring->netdev->features & NETIF_F_RXCSUM))
                 return;
 
+        if ((pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_VXLAN)) &&
+            (hdr_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_TUNNEL >> 16))) {
+                encap_pkt = true;
+                skb->encapsulation = 1;
+                skb->ip_summed = CHECKSUM_NONE;
+        }
+
         /* if IP and error */
         if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_IPCS) &&
             ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_IPE)) {
@@ -1413,8 +1425,6 @@ static inline void ixgbe_rx_checksum(struct ixgbe_ring *ring,
                 return;
 
         if (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_TCPE)) {
-                __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
-
                 /*
                  * 82599 errata, UDP frames with a 0 checksum can be marked as
                  * checksum errors.
@@ -1429,6 +1439,17 @@ static inline void ixgbe_rx_checksum(struct ixgbe_ring *ring,
 
         /* It must be a TCP or UDP packet with a valid checksum */
         skb->ip_summed = CHECKSUM_UNNECESSARY;
+        if (encap_pkt) {
+                if (!ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_OUTERIPCS))
+                        return;
+
+                if (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_OUTERIPER)) {
+                        ring->rx_stats.csum_err++;
+                        return;
+                }
+                /* If we checked the outer header let the stack know */
+                skb->csum_level = 1;
+        }
 }
 
 static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
@@ -5627,6 +5648,10 @@ static int ixgbe_open(struct net_device *netdev)
 
         ixgbe_up_complete(adapter);
 
+#if IS_ENABLED(CONFIG_IXGBE_VXLAN)
+        vxlan_get_rx_port(netdev);
+
+#endif
         return 0;
 
 err_set_queues:
@@ -7771,6 +7796,64 @@ static int ixgbe_set_features(struct net_device *netdev,
         return 0;
 }
 
+/**
+ * ixgbe_add_vxlan_port - Get notifications about VXLAN ports that come up
+ * @dev: The port's netdev
+ * @sa_family: Socket Family that VXLAN is notifiying us about
+ * @port: New UDP port number that VXLAN started listening to
+ **/
+static void ixgbe_add_vxlan_port(struct net_device *dev, sa_family_t sa_family,
+                                 __be16 port)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(dev);
+        struct ixgbe_hw *hw = &adapter->hw;
+        u16 new_port = ntohs(port);
+
+        if (sa_family == AF_INET6)
+                return;
+
+        if (adapter->vxlan_port == new_port) {
+                netdev_info(dev, "Port %d already offloaded\n", new_port);
+                return;
+        }
+
+        if (adapter->vxlan_port) {
+                netdev_info(dev,
+                            "Hit Max num of UDP ports, not adding port %d\n",
+                            new_port);
+                return;
+        }
+
+        adapter->vxlan_port = new_port;
+        IXGBE_WRITE_REG(hw, IXGBE_VXLANCTRL, new_port);
+}
+
+/**
+ * ixgbe_del_vxlan_port - Get notifications about VXLAN ports that go away
+ * @dev: The port's netdev
+ * @sa_family: Socket Family that VXLAN is notifying us about
+ * @port: UDP port number that VXLAN stopped listening to
+ **/
+static void ixgbe_del_vxlan_port(struct net_device *dev, sa_family_t sa_family,
+                                 __be16 port)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(dev);
+        struct ixgbe_hw *hw = &adapter->hw;
+        u16 new_port = ntohs(port);
+
+        if (sa_family == AF_INET6)
+                return;
+
+        if (adapter->vxlan_port != new_port) {
+                netdev_info(dev, "Port %d was not found, not deleting\n",
+                            new_port);
+                return;
+        }
+
+        adapter->vxlan_port = 0;
+        IXGBE_WRITE_REG(hw, IXGBE_VXLANCTRL, 0);
+}
+
 static int ixgbe_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
                              struct net_device *dev,
                              const unsigned char *addr, u16 vid,
@@ -7982,6 +8065,8 @@ static const struct net_device_ops ixgbe_netdev_ops = {
         .ndo_bridge_getlink     = ixgbe_ndo_bridge_getlink,
         .ndo_dfwd_add_station   = ixgbe_fwd_add,
         .ndo_dfwd_del_station   = ixgbe_fwd_del,
+        .ndo_add_vxlan_port     = ixgbe_add_vxlan_port,
+        .ndo_del_vxlan_port     = ixgbe_del_vxlan_port,
 };
 
 /**
@@ -8339,6 +8424,15 @@ skip_sriov:
         netdev->priv_flags |= IFF_UNICAST_FLT;
         netdev->priv_flags |= IFF_SUPP_NOFCS;
 
+        switch (adapter->hw.mac.type) {
+        case ixgbe_mac_X550:
+        case ixgbe_mac_X550EM_x:
+                netdev->hw_enc_features |= NETIF_F_RXCSUM;
+                break;
+        default:
+                break;
+        }
+
 #ifdef CONFIG_IXGBE_DCB
         netdev->dcbnl_ops = &dcbnl_ops;
 #endif
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index d101b25dc4b6..02b57bfe72b0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -399,6 +399,7 @@ struct ixgbe_thermal_sensor_data {
 
 #define IXGBE_WUPL      0x05900
 #define IXGBE_WUPM      0x05A00 /* wake up pkt memory 0x5A00-0x5A7C */
+#define IXGBE_VXLANCTRL 0x0000507C /* Rx filter VXLAN UDPPORT Register */
 #define IXGBE_FHFT(_n)  (0x09000 + ((_n) * 0x100)) /* Flex host filter table */
 #define IXGBE_FHFT_EXT(_n)      (0x09800 + ((_n) * 0x100)) /* Ext Flexible Host
                                                             * Filter Table */
@@ -2122,6 +2123,7 @@ enum {
 #define IXGBE_RXD_STAT_IPCS     0x40    /* IP xsum calculated */
 #define IXGBE_RXD_STAT_PIF      0x80    /* passed in-exact filter */
 #define IXGBE_RXD_STAT_CRCV     0x100   /* Speculative CRC Valid */
+#define IXGBE_RXD_STAT_OUTERIPCS  0x100 /* Cloud IP xsum calculated */
 #define IXGBE_RXD_STAT_VEXT     0x200   /* 1st VLAN found */
 #define IXGBE_RXD_STAT_UDPV     0x400   /* Valid UDP checksum */
 #define IXGBE_RXD_STAT_DYNINT   0x800   /* Pkt caused INT via DYNINT */
@@ -2139,6 +2141,7 @@ enum {
 #define IXGBE_RXD_ERR_IPE       0x80    /* IP Checksum Error */
 #define IXGBE_RXDADV_ERR_MASK           0xfff00000 /* RDESC.ERRORS mask */
 #define IXGBE_RXDADV_ERR_SHIFT          20         /* RDESC.ERRORS shift */
+#define IXGBE_RXDADV_ERR_OUTERIPER      0x04000000 /* CRC IP Header error */
 #define IXGBE_RXDADV_ERR_FCEOFE         0x80000000 /* FCoEFe/IPE */
 #define IXGBE_RXDADV_ERR_FCERR          0x00700000 /* FCERR/FDIRERR */
 #define IXGBE_RXDADV_ERR_FDIR_LEN       0x00100000 /* FDIR Length error */
@@ -2227,6 +2230,8 @@ enum {
 #define IXGBE_RXDADV_PKTTYPE_UDP        0x00000200 /* UDP hdr present */
 #define IXGBE_RXDADV_PKTTYPE_SCTP       0x00000400 /* SCTP hdr present */
 #define IXGBE_RXDADV_PKTTYPE_NFS        0x00000800 /* NFS hdr present */
+#define IXGBE_RXDADV_PKTTYPE_VXLAN      0x00000800 /* VXLAN hdr present */
+#define IXGBE_RXDADV_PKTTYPE_TUNNEL     0x00010000 /* Tunnel type */
 #define IXGBE_RXDADV_PKTTYPE_IPSEC_ESP  0x00001000 /* IPSec ESP */
 #define IXGBE_RXDADV_PKTTYPE_IPSEC_AH   0x00002000 /* IPSec AH */
 #define IXGBE_RXDADV_PKTTYPE_LINKSEC    0x00004000 /* LinkSec Encap */