cxgb4: Add MPS TCAM refcounting for cxgb4 change mac

This patch adds TCAM reference counting
support for cxgb4 change mac path
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

@@ -1911,6 +1911,10 @@ int cxgb4_set_msix_aff(struct adapter *adap, unsigned short vec,
 		       cpumask_var_t *aff_mask, int idx);
 void cxgb4_clear_msix_aff(unsigned short vec, cpumask_var_t aff_mask);
 
+int cxgb4_change_mac(struct port_info *pi, unsigned int viid,
+		     int *tcam_idx, const u8 *addr,
+		     bool persistent, u8 *smt_idx);
+
 int cxgb4_init_mps_ref_entries(struct adapter *adap);
 void cxgb4_free_mps_ref_entries(struct adapter *adap);
 int cxgb4_alloc_encap_mac_filt(struct adapter *adap, unsigned int viid,
@@ -1935,5 +1939,8 @@ int cxgb4_alloc_raw_mac_filt(struct adapter *adap,
 			     u8 lookup_type,
 			     u8 port_id,
 			     bool sleep_ok);
+int cxgb4_update_mac_filt(struct port_info *pi, unsigned int viid,
+			  int *tcam_idx, const u8 *addr,
+			  bool persistent, u8 *smt_idx);
 
 #endif /* __CXGB4_H__ */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -449,7 +449,7 @@ static int set_rxmode(struct net_device *dev, int mtu, bool sleep_ok)
  *	Addresses are programmed to hash region, if tcam runs out of entries.
  *
  */
-static int cxgb4_change_mac(struct port_info *pi, unsigned int viid,
+int cxgb4_change_mac(struct port_info *pi, unsigned int viid,
 		     int *tcam_idx, const u8 *addr, bool persist,
 		     u8 *smt_idx)
 {
@@ -505,7 +505,7 @@ static int link_start(struct net_device *dev)
 	ret = t4_set_rxmode(pi->adapter, mb, pi->viid, dev->mtu, -1, -1, -1,
 			    !!(dev->features & NETIF_F_HW_VLAN_CTAG_RX), true);
 	if (ret == 0)
-		ret = cxgb4_change_mac(pi, pi->viid, &pi->xact_addr_filt,
+		ret = cxgb4_update_mac_filt(pi, pi->viid, &pi->xact_addr_filt,
 					    dev->dev_addr, true, &pi->smt_idx);
 	if (ret == 0)
 		ret = t4_link_l1cfg(pi->adapter, mb, pi->tx_chan,
@@ -3020,7 +3020,7 @@ static int cxgb_set_mac_addr(struct net_device *dev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	ret = cxgb4_change_mac(pi, pi->viid, &pi->xact_addr_filt,
+	ret = cxgb4_update_mac_filt(pi, pi->viid, &pi->xact_addr_filt,
 				    addr->sa_data, true, &pi->smt_idx);
 	if (ret < 0)
 		return ret;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c

@@ -54,6 +54,21 @@ static int cxgb4_mps_ref_inc(struct adapter *adap, const u8 *mac_addr,
 	return ret;
 }
 
+int cxgb4_update_mac_filt(struct port_info *pi, unsigned int viid,
+			  int *tcam_idx, const u8 *addr,
+			  bool persistent, u8 *smt_idx)
+{
+	int ret;
+
+	ret = cxgb4_change_mac(pi, viid, tcam_idx,
+			       addr, persistent, smt_idx);
+	if (ret < 0)
+		return ret;
+
+	cxgb4_mps_ref_inc(pi->adapter, addr, *tcam_idx, NULL);
+	return ret;
+}
+
 int cxgb4_free_raw_mac_filt(struct adapter *adap,
 			    unsigned int viid,
 			    const u8 *addr,