Merge branch 'enic-vxlan-offload'

Govindarajulu Varadarajan says:

====================
enic: add vxlan offload support

This series adds vxlan offload support for enic driver. The first
patch adds vxlan devcmd for configuring vxland offload parameters.
Second patch adds ndo_udp_tunnel_add/del and offload on rx path.
There are to modes in which fw supports vxlan offload.

mode 0: fcoe bit is set for encapsulated packet. fcoe_fc_crc_ok is set
if checksum of csum is ok. This bit is or of ip_csum_ok and
tcp_udp_csum_ok

mode 2: BIT(0) in rss_hash is set if it is encapsulated packet.
        BIT(1) is set if outer_ip_csum_ok/
        BIT(2) is set if outer_tcp_csum_ok

Some hw supports only mode 0, some support mode 0 and 2. Driver gets
the supported modes bitmap using get_supported_feature_ver devcmd
and selects the highest mode both driver and fw supports.

Third patch adds offload support on tx path by adding
enic_features_check().

v2: Order local variable declarations from longest to shortest line,
    on all three patches.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cisco/enic/enic.h

@@ -135,6 +135,11 @@ struct enic_rfs_flw_tbl {
 	struct timer_list rfs_may_expire;
 };
 
+struct vxlan_offload {
+	u16 vxlan_udp_port_number;
+	u8 patch_level;
+};
+
 /* Per-instance private data structure */
 struct enic {
 	struct net_device *netdev;
@@ -175,6 +180,7 @@ struct enic {
 	/* receive queue cache line section */
 	____cacheline_aligned struct vnic_rq rq[ENIC_RQ_MAX];
 	unsigned int rq_count;
+	struct vxlan_offload vxlan;
 	u64 rq_truncated_pkts;
 	u64 rq_bad_fcs;
 	struct napi_struct napi[ENIC_RQ_MAX + ENIC_WQ_MAX];

drivers/net/ethernet/cisco/enic/vnic_dev.c

@@ -1247,3 +1247,37 @@ int vnic_dev_classifier(struct vnic_dev *vdev, u8 cmd, u16 *entry,
 
 	return ret;
 }
+
+int vnic_dev_overlay_offload_ctrl(struct vnic_dev *vdev, u8 overlay, u8 config)
+{
+	u64 a0 = overlay;
+	u64 a1 = config;
+	int wait = 1000;
+
+	return vnic_dev_cmd(vdev, CMD_OVERLAY_OFFLOAD_CTRL, &a0, &a1, wait);
+}
+
+int vnic_dev_overlay_offload_cfg(struct vnic_dev *vdev, u8 overlay,
+				 u16 vxlan_udp_port_number)
+{
+	u64 a1 = vxlan_udp_port_number;
+	u64 a0 = overlay;
+	int wait = 1000;
+
+	return vnic_dev_cmd(vdev, CMD_OVERLAY_OFFLOAD_CFG, &a0, &a1, wait);
+}
+
+int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
+				       u64 *supported_versions)
+{
+	u64 a0 = feature;
+	int wait = 1000;
+	u64 a1 = 0;
+	int ret;
+
+	ret = vnic_dev_cmd(vdev, CMD_GET_SUPP_FEATURE_VER, &a0, &a1, wait);
+	if (!ret)
+		*supported_versions = a0;
+
+	return ret;
+}

drivers/net/ethernet/cisco/enic/vnic_dev.h

@@ -179,5 +179,10 @@ int vnic_dev_set_mac_addr(struct vnic_dev *vdev, u8 *mac_addr);
 int vnic_dev_classifier(struct vnic_dev *vdev, u8 cmd, u16 *entry,
 			struct filter *data);
 int vnic_devcmd_init(struct vnic_dev *vdev);
+int vnic_dev_overlay_offload_ctrl(struct vnic_dev *vdev, u8 overlay, u8 config);
+int vnic_dev_overlay_offload_cfg(struct vnic_dev *vdev, u8 overlay,
+				 u16 vxlan_udp_port_number);
+int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
+				       u64 *supported_versions);
 
 #endif /* _VNIC_DEV_H_ */

drivers/net/ethernet/cisco/enic/vnic_devcmd.h

@@ -406,6 +406,31 @@ enum vnic_devcmd_cmd {
 	 * in: (u32) a0=Queue Pair number
 	 */
 	CMD_QP_STATS_CLEAR = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ENET, 63),
+
+	/* Use this devcmd for agreeing on the highest common version supported
+	 * by both driver and fw for features who need such a facility.
+	 * in:	(u64) a0 = feature (driver requests for the supported versions
+	 *	on this feature)
+	 * out: (u64) a0 = bitmap of all supported versions for that feature
+	 */
+	CMD_GET_SUPP_FEATURE_VER = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ENET, 69),
+
+	/* Control (Enable/Disable) overlay offloads on the given vnic
+	 * in: (u8) a0 = OVERLAY_FEATURE_NVGRE : NVGRE
+	 *	    a0 = OVERLAY_FEATURE_VXLAN : VxLAN
+	 * in: (u8) a1 = OVERLAY_OFFLOAD_ENABLE : Enable or
+	 *	    a1 = OVERLAY_OFFLOAD_DISABLE : Disable or
+	 *	    a1 = OVERLAY_OFFLOAD_ENABLE_V2 : Enable with version 2
+	 */
+	CMD_OVERLAY_OFFLOAD_CTRL = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ENET, 72),
+
+	/* Configuration of overlay offloads feature on a given vNIC
+	 * in: (u8) a0 = DEVCMD_OVERLAY_NVGRE : NVGRE
+	 *	    a0 = DEVCMD_OVERLAY_VXLAN : VxLAN
+	 * in: (u8) a1 = VXLAN_PORT_UPDATE : VxLAN
+	 * in: (u16) a2 = unsigned short int port information
+	 */
+	CMD_OVERLAY_OFFLOAD_CFG = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ENET, 73),
 };
 
 /* CMD_ENABLE2 flags */
@@ -657,4 +682,30 @@ struct devcmd2_result {
 #define DEVCMD2_RING_SIZE	32
 #define DEVCMD2_DESC_SIZE	128
 
+enum overlay_feature_t {
+	OVERLAY_FEATURE_NVGRE = 1,
+	OVERLAY_FEATURE_VXLAN,
+	OVERLAY_FEATURE_MAX,
+};
+
+enum overlay_ofld_cmd {
+	OVERLAY_OFFLOAD_ENABLE,
+	OVERLAY_OFFLOAD_DISABLE,
+	OVERLAY_OFFLOAD_ENABLE_P2,
+	OVERLAY_OFFLOAD_MAX,
+};
+
+#define OVERLAY_CFG_VXLAN_PORT_UPDATE	0
+
+/* Use this enum to get the supported versions for each of these features
+ * If you need to use the devcmd_get_supported_feature_version(), add
+ * the new feature into this enum and install function handler in devcmd.c
+ */
+enum vic_feature_t {
+	VIC_FEATURE_VXLAN,
+	VIC_FEATURE_RDMA,
+	VIC_FEATURE_VXLAN_PATCH,
+	VIC_FEATURE_MAX,
+};
+
 #endif /* _VNIC_DEVCMD_H_ */

drivers/net/ethernet/cisco/enic/vnic_enet.h

@@ -48,6 +48,7 @@ struct vnic_enet_config {
 #define VENETF_RSSHASH_IPV6_EX	0x200	/* Hash on IPv6 extended fields */
 #define VENETF_RSSHASH_TCPIPV6_EX 0x400	/* Hash on TCP + IPv6 ext. fields */
 #define VENETF_LOOP		0x800	/* Loopback enabled */
+#define VENETF_VXLAN		0x10000	/* VxLAN offload */
 
 #define VENET_INTR_TYPE_MIN	0	/* Timer specs min interrupt spacing */
 #define VENET_INTR_TYPE_IDLE	1	/* Timer specs idle time before irq */