cxgb4/cxgb4vf: Program hash region for {t4/t4vf}_change_mac()

{t4/t4_vf}_change_mac() API's were only doing additions to MPS_TCAM.
This will fail, when the number of tcam entries is limited particularly
in vf's.
This fix programs hash region with the mac address, when TCAM
addtion fails for {t4/t4vf}_change_mac(). Since the locally maintained
driver list for hash entries is shared across mac_{sync/unsync}(),
added an extra parameter if_mac to track the address added thorugh
{t4/t4vf}_change_mac()

Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -568,7 +568,7 @@ struct sge_rspq;
 struct port_info {
 	struct adapter *adapter;
 	u16    viid;
-	s16    xact_addr_filt;        /* index of exact MAC address filter */
+	int    xact_addr_filt;        /* index of exact MAC address filter */
 	u16    rss_size;              /* size of VI's RSS table slice */
 	s8     mdio_addr;
 	enum fw_port_type port_type;
@@ -860,6 +860,7 @@ struct doorbell_stats {
 struct hash_mac_addr {
 	struct list_head list;
 	u8 addr[ETH_ALEN];
+	unsigned int iface_mac;
 };
 
 struct uld_msix_bmap {

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

@@ -433,6 +433,60 @@ static int set_rxmode(struct net_device *dev, int mtu, bool sleep_ok)
 }
 
 /**
+ *	cxgb4_change_mac - Update match filter for a MAC address.
+ *	@pi: the port_info
+ *	@viid: the VI id
+ *	@tcam_idx: TCAM index of existing filter for old value of MAC address,
+ *		   or -1
+ *	@addr: the new MAC address value
+ *	@persist: whether a new MAC allocation should be persistent
+ *	@add_smt: if true also add the address to the HW SMT
+ *
+ *	Modifies an MPS filter and sets it to the new MAC address if
+ *	@tcam_idx >= 0, or adds the MAC address to a new filter if
+ *	@tcam_idx < 0. In the latter case the address is added persistently
+ *	if @persist is %true.
+ *	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 *tcam_idx, const u8 *addr, bool persist,
+			    u8 *smt_idx)
+{
+	struct adapter *adapter = pi->adapter;
+	struct hash_mac_addr *entry, *new_entry;
+	int ret;
+
+	ret = t4_change_mac(adapter, adapter->mbox, viid,
+			    *tcam_idx, addr, persist, smt_idx);
+	/* We ran out of TCAM entries. try programming hash region. */
+	if (ret == -ENOMEM) {
+		/* If the MAC address to be updated is in the hash addr
+		 * list, update it from the list
+		 */
+		list_for_each_entry(entry, &adapter->mac_hlist, list) {
+			if (entry->iface_mac) {
+				ether_addr_copy(entry->addr, addr);
+				goto set_hash;
+			}
+		}
+		new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
+		if (!new_entry)
+			return -ENOMEM;
+		ether_addr_copy(new_entry->addr, addr);
+		new_entry->iface_mac = true;
+		list_add_tail(&new_entry->list, &adapter->mac_hlist);
+set_hash:
+		ret = cxgb4_set_addr_hash(pi);
+	} else if (ret >= 0) {
+		*tcam_idx = ret;
+		ret = 0;
+	}
+
+	return ret;
+}
+
+/*
  *	link_start - enable a port
  *	@dev: the port to enable
  *
@@ -450,15 +504,9 @@ 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 = t4_change_mac(pi->adapter, mb, pi->viid,
-				    pi->xact_addr_filt, dev->dev_addr, true,
-				    &pi->smt_idx);
-		if (ret >= 0) {
-			pi->xact_addr_filt = ret;
-			ret = 0;
-		}
-	}
+	if (ret == 0)
+		ret = cxgb4_change_mac(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,
 				    &pi->link_cfg);
@@ -2839,9 +2887,8 @@ static int cxgb_set_mac_addr(struct net_device *dev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	ret = t4_change_mac(pi->adapter, pi->adapter->pf, pi->viid,
-			    pi->xact_addr_filt, addr->sa_data, true,
-			    &pi->smt_idx);
+	ret = cxgb4_change_mac(pi, pi->viid, &pi->xact_addr_filt,
+			       addr->sa_data, true, &pi->smt_idx);
 	if (ret < 0)
 		return ret;
 

drivers/net/ethernet/chelsio/cxgb4vf/adapter.h

@@ -94,7 +94,7 @@ struct port_info {
 	struct adapter *adapter;	/* our adapter */
 	u32 vlan_id;			/* vlan id for VST */
 	u16 viid;			/* virtual interface ID */
-	s16 xact_addr_filt;		/* index of our MAC address filter */
+	int xact_addr_filt;		/* index of our MAC address filter */
 	u16 rss_size;			/* size of VI's RSS table slice */
 	u8 pidx;			/* index into adapter port[] */
 	s8 mdio_addr;
@@ -352,6 +352,7 @@ struct sge {
 struct hash_mac_addr {
 	struct list_head list;
 	u8 addr[ETH_ALEN];
+	unsigned int iface_mac;
 };
 
 struct mbox_list {

drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c

@@ -236,6 +236,73 @@ void t4vf_os_portmod_changed(struct adapter *adapter, int pidx)
 			 "inserted\n", dev->name, pi->mod_type);
 }
 
+static int cxgb4vf_set_addr_hash(struct port_info *pi)
+{
+	struct adapter *adapter = pi->adapter;
+	u64 vec = 0;
+	bool ucast = false;
+	struct hash_mac_addr *entry;
+
+	/* Calculate the hash vector for the updated list and program it */
+	list_for_each_entry(entry, &adapter->mac_hlist, list) {
+		ucast |= is_unicast_ether_addr(entry->addr);
+		vec |= (1ULL << hash_mac_addr(entry->addr));
+	}
+	return t4vf_set_addr_hash(adapter, pi->viid, ucast, vec, false);
+}
+
+/**
+ *	cxgb4vf_change_mac - Update match filter for a MAC address.
+ *	@pi: the port_info
+ *	@viid: the VI id
+ *	@tcam_idx: TCAM index of existing filter for old value of MAC address,
+ *		   or -1
+ *	@addr: the new MAC address value
+ *	@persist: whether a new MAC allocation should be persistent
+ *	@add_smt: if true also add the address to the HW SMT
+ *
+ *	Modifies an MPS filter and sets it to the new MAC address if
+ *	@tcam_idx >= 0, or adds the MAC address to a new filter if
+ *	@tcam_idx < 0. In the latter case the address is added persistently
+ *	if @persist is %true.
+ *	Addresses are programmed to hash region, if tcam runs out of entries.
+ *
+ */
+static int cxgb4vf_change_mac(struct port_info *pi, unsigned int viid,
+			      int *tcam_idx, const u8 *addr, bool persistent)
+{
+	struct hash_mac_addr *new_entry, *entry;
+	struct adapter *adapter = pi->adapter;
+	int ret;
+
+	ret = t4vf_change_mac(adapter, viid, *tcam_idx, addr, persistent);
+	/* We ran out of TCAM entries. try programming hash region. */
+	if (ret == -ENOMEM) {
+		/* If the MAC address to be updated is in the hash addr
+		 * list, update it from the list
+		 */
+		list_for_each_entry(entry, &adapter->mac_hlist, list) {
+			if (entry->iface_mac) {
+				ether_addr_copy(entry->addr, addr);
+				goto set_hash;
+			}
+		}
+		new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
+		if (!new_entry)
+			return -ENOMEM;
+		ether_addr_copy(new_entry->addr, addr);
+		new_entry->iface_mac = true;
+		list_add_tail(&new_entry->list, &adapter->mac_hlist);
+set_hash:
+		ret = cxgb4vf_set_addr_hash(pi);
+	} else if (ret >= 0) {
+		*tcam_idx = ret;
+		ret = 0;
+	}
+
+	return ret;
+}
+
 /*
  * Net device operations.
  * ======================
@@ -259,14 +326,10 @@ static int link_start(struct net_device *dev)
 	 */
 	ret = t4vf_set_rxmode(pi->adapter, pi->viid, dev->mtu, -1, -1, -1, 1,
 			      true);
-	if (ret == 0) {
-		ret = t4vf_change_mac(pi->adapter, pi->viid,
-				      pi->xact_addr_filt, dev->dev_addr, true);
-		if (ret >= 0) {
-			pi->xact_addr_filt = ret;
-			ret = 0;
-		}
-	}
+	if (ret == 0)
+		ret = cxgb4vf_change_mac(pi, pi->viid,
+					 &pi->xact_addr_filt,
+					 dev->dev_addr, true);
 
 	/*
 	 * We don't need to actually "start the link" itself since the
@@ -870,21 +933,6 @@ static struct net_device_stats *cxgb4vf_get_stats(struct net_device *dev)
 	return ns;
 }
 
-static inline int cxgb4vf_set_addr_hash(struct port_info *pi)
-{
-	struct adapter *adapter = pi->adapter;
-	u64 vec = 0;
-	bool ucast = false;
-	struct hash_mac_addr *entry;
-
-	/* Calculate the hash vector for the updated list and program it */
-	list_for_each_entry(entry, &adapter->mac_hlist, list) {
-		ucast |= is_unicast_ether_addr(entry->addr);
-		vec |= (1ULL << hash_mac_addr(entry->addr));
-	}
-	return t4vf_set_addr_hash(adapter, pi->viid, ucast, vec, false);
-}
-
 static int cxgb4vf_mac_sync(struct net_device *netdev, const u8 *mac_addr)
 {
 	struct port_info *pi = netdev_priv(netdev);
@@ -1166,13 +1214,12 @@ static int cxgb4vf_set_mac_addr(struct net_device *dev, void *_addr)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	ret = t4vf_change_mac(pi->adapter, pi->viid, pi->xact_addr_filt,
-			      addr->sa_data, true);
+	ret = cxgb4vf_change_mac(pi, pi->viid, &pi->xact_addr_filt,
+				 addr->sa_data, true);
 	if (ret < 0)
 		return ret;
 
 	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
-	pi->xact_addr_filt = ret;
 	return 0;
 }