net: bcmgenet: add support for ethtool rxnfc flows

This commit enables driver support for ethtool commands of this form:
ethtool -N|-U|--config-nfc|--config-ntuple devname
    flow-type ether|ip4
    [src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]]
    [dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [proto N [m N]]
    [src-ip x.x.x.x [m x.x.x.x]] [dst-ip x.x.x.x [m x.x.x.x]] [tos N [m N]]
    [l4proto N [m N]] [src-port N [m N]] [dst-port N [m N]] [spi N [m N]]
    [l4data N [m N]] [vlan-etype N [m N]] [vlan N [m N]]
    [dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [action 0] [loc N] |
    delete N

Since there is only one Rx Ring in this implementation action 0 behaves no
differently from not specifying a rule.

The rules can be seen with ethtool commands of this form:
ethtool -n|-u|--show-nfc|--show-ntuple devname [rule N]
Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/genet/bcmgenet.h

@@ -32,6 +32,7 @@
 #define DMA_MAX_BURST_LENGTH    0x10
 
 /* misc. configuration */
+#define MAX_NUM_OF_FS_RULES		16
 #define CLEAR_ALL_HFB			0xFF
 #define DMA_FC_THRESH_HI		(TOTAL_DESC >> 4)
 #define DMA_FC_THRESH_LO		5
@@ -609,6 +610,18 @@ struct bcmgenet_rx_ring {
 	struct bcmgenet_priv *priv;
 };
 
+enum bcmgenet_rxnfc_state {
+	BCMGENET_RXNFC_STATE_UNUSED = 0,
+	BCMGENET_RXNFC_STATE_DISABLED,
+	BCMGENET_RXNFC_STATE_ENABLED
+};
+
+struct bcmgenet_rxnfc_rule {
+	struct	list_head list;
+	struct ethtool_rx_flow_spec	fs;
+	enum bcmgenet_rxnfc_state state;
+};
+
 /* device context */
 struct bcmgenet_priv {
 	void __iomem *base;
@@ -627,6 +640,8 @@ struct bcmgenet_priv {
 	struct enet_cb *rx_cbs;
 	unsigned int num_rx_bds;
 	unsigned int rx_buf_len;
+	struct bcmgenet_rxnfc_rule rxnfc_rules[MAX_NUM_OF_FS_RULES];
+	struct list_head rxnfc_list;
 
 	struct bcmgenet_rx_ring rx_rings[DESC_INDEX + 1];
 
@@ -679,6 +694,7 @@ struct bcmgenet_priv {
 	u32 wolopts;
 	u8 sopass[SOPASS_MAX];
 	bool wol_active;
+	u32 hfb_en[3];
 
 	struct bcmgenet_mib_counters mib;