qlcnic: fix ping resumption to a VM after a live migration

Delete the MAC address of a VM, from the adapter's embedded switch,
after the VM had been migrated out of this adapter/server.

Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: Jitendra Kalsaria <jitendra.kalsaria@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 177 insertions, 12 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
index 61b594c6d9d..01e9ea149da 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
@@ -1008,9 +1008,12 @@ struct qlcnic_adapter {
 	struct delayed_work idc_aen_work;
 
 	struct qlcnic_filter_hash fhash;
+	struct qlcnic_filter_hash rx_fhash;
 
 	spinlock_t tx_clean_lock;
 	spinlock_t mac_learn_lock;
+	/* spinlock for catching rcv filters for eswitch traffic */
+	spinlock_t rx_mac_learn_lock;
 	u32 file_prd_off;	/*File fw product offset*/
 	u32 fw_version;
 	const struct firmware *fw;
@@ -1506,6 +1509,8 @@ int qlcnic_init_pci_info(struct qlcnic_adapter *);
 int qlcnic_set_default_offload_settings(struct qlcnic_adapter *);
 int qlcnic_reset_npar_config(struct qlcnic_adapter *);
 int qlcnic_set_eswitch_port_config(struct qlcnic_adapter *);
+void qlcnic_add_lb_filter(struct qlcnic_adapter *, struct sk_buff *, int,
+			  __le16);
 /*
  * QLOGIC Board information
  */
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
index 51716ab8739..325e11e1ce0 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
@@ -578,7 +578,8 @@ void qlcnic_prune_lb_filters(struct qlcnic_adapter *adapter)
 	struct qlcnic_filter *tmp_fil;
 	struct hlist_node *tmp_hnode, *n;
 	struct hlist_head *head;
-	int i, time;
+	int i;
+	unsigned long time;
 	u8 cmd;
 
 	for (i = 0; i < adapter->fhash.fbucket_size; i++) {
@@ -600,6 +601,21 @@ void qlcnic_prune_lb_filters(struct qlcnic_adapter *adapter)
 			}
 		}
 	}
+	for (i = 0; i < adapter->rx_fhash.fbucket_size; i++) {
+		head = &(adapter->rx_fhash.fhead[i]);
+
+		hlist_for_each_entry_safe(tmp_fil, tmp_hnode, n, head, fnode)
+		{
+			time = tmp_fil->ftime;
+			if (jiffies > (QLCNIC_FILTER_AGE * HZ + time)) {
+				spin_lock_bh(&adapter->rx_mac_learn_lock);
+				adapter->rx_fhash.fnum--;
+				hlist_del(&tmp_fil->fnode);
+				spin_unlock_bh(&adapter->rx_mac_learn_lock);
+				kfree(tmp_fil);
+			}
+		}
+	}
 }
 
 void qlcnic_delete_lb_filters(struct qlcnic_adapter *adapter)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
index 2990f45df78..6387e0cc3ea 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
@@ -152,6 +152,89 @@ static inline u32 qlcnic_get_ref_handle(struct qlcnic_adapter *adapter,
 		return handle;
 }
 
+static inline int qlcnic_82xx_is_lb_pkt(u64 sts_data)
+{
+	return (qlcnic_get_sts_status(sts_data) == STATUS_CKSUM_LOOP) ? 1 : 0;
+}
+
+void qlcnic_add_lb_filter(struct qlcnic_adapter *adapter, struct sk_buff *skb,
+			  int loopback_pkt, __le16 vlan_id)
+{
+	struct ethhdr *phdr = (struct ethhdr *)(skb->data);
+	struct qlcnic_filter *fil, *tmp_fil;
+	struct hlist_node *tmp_hnode, *n;
+	struct hlist_head *head;
+	unsigned long time;
+	u64 src_addr = 0;
+	u8 hindex, found = 0, op;
+	int ret;
+
+	memcpy(&src_addr, phdr->h_source, ETH_ALEN);
+
+	if (loopback_pkt) {
+		if (adapter->rx_fhash.fnum >= adapter->rx_fhash.fmax)
+			return;
+
+		hindex = qlcnic_mac_hash(src_addr) &
+			 (adapter->fhash.fbucket_size - 1);
+		head = &(adapter->rx_fhash.fhead[hindex]);
+
+		hlist_for_each_entry_safe(tmp_fil, tmp_hnode, n, head, fnode) {
+			if (!memcmp(tmp_fil->faddr, &src_addr, ETH_ALEN) &&
+			    tmp_fil->vlan_id == vlan_id) {
+				time = tmp_fil->ftime;
+				if (jiffies > (QLCNIC_READD_AGE * HZ + time))
+					tmp_fil->ftime = jiffies;
+				return;
+			}
+		}
+
+		fil = kzalloc(sizeof(struct qlcnic_filter), GFP_ATOMIC);
+		if (!fil)
+			return;
+
+		fil->ftime = jiffies;
+		memcpy(fil->faddr, &src_addr, ETH_ALEN);
+		fil->vlan_id = vlan_id;
+		spin_lock(&adapter->rx_mac_learn_lock);
+		hlist_add_head(&(fil->fnode), head);
+		adapter->rx_fhash.fnum++;
+		spin_unlock(&adapter->rx_mac_learn_lock);
+	} else {
+		hindex = qlcnic_mac_hash(src_addr) &
+			 (adapter->fhash.fbucket_size - 1);
+		head = &(adapter->rx_fhash.fhead[hindex]);
+		spin_lock(&adapter->rx_mac_learn_lock);
+		hlist_for_each_entry_safe(tmp_fil, tmp_hnode, n, head, fnode) {
+			if (!memcmp(tmp_fil->faddr, &src_addr, ETH_ALEN) &&
+			    tmp_fil->vlan_id == vlan_id) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (!found) {
+			spin_unlock(&adapter->rx_mac_learn_lock);
+			return;
+		}
+
+		op = vlan_id ? QLCNIC_MAC_VLAN_ADD : QLCNIC_MAC_ADD;
+		ret = qlcnic_sre_macaddr_change(adapter, (u8 *)&src_addr,
+						vlan_id, op);
+		if (!ret) {
+			op = vlan_id ? QLCNIC_MAC_VLAN_DEL : QLCNIC_MAC_DEL;
+			ret = qlcnic_sre_macaddr_change(adapter,
+							(u8 *)&src_addr,
+							vlan_id, op);
+			if (!ret) {
+				hlist_del(&(tmp_fil->fnode));
+				adapter->rx_fhash.fnum--;
+			}
+		}
+		spin_unlock(&adapter->rx_mac_learn_lock);
+	}
+}
+
 void qlcnic_82xx_change_filter(struct qlcnic_adapter *adapter, u64 *uaddr,
 			       __le16 vlan_id)
 {
@@ -207,9 +290,6 @@ static void qlcnic_send_filter(struct qlcnic_adapter *adapter,
 		return;
 	}
 
-	/* Only NPAR capable devices support vlan based learning */
-	if (adapter->flags & QLCNIC_ESWITCH_ENABLED)
-		vlan_id = first_desc->vlan_TCI;
 	memcpy(&src_addr, phdr->h_source, ETH_ALEN);
 	hindex = qlcnic_mac_hash(src_addr) & (adapter->fhash.fbucket_size - 1);
 	head = &(adapter->fhash.fhead[hindex]);
@@ -920,8 +1000,8 @@ qlcnic_process_rcv(struct qlcnic_adapter *adapter,
 	struct qlcnic_rx_buffer *buffer;
 	struct sk_buff *skb;
 	struct qlcnic_host_rds_ring *rds_ring;
-	int index, length, cksum, pkt_offset;
-	u16 vid = 0xffff;
+	int index, length, cksum, pkt_offset, is_lb_pkt;
+	u16 vid = 0xffff, t_vid;
 
 	if (unlikely(ring >= adapter->max_rds_rings))
 		return NULL;
@@ -941,6 +1021,14 @@ qlcnic_process_rcv(struct qlcnic_adapter *adapter,
 	if (!skb)
 		return buffer;
 
+	if (adapter->drv_mac_learn &&
+	    (adapter->flags & QLCNIC_ESWITCH_ENABLED)) {
+		t_vid = 0;
+		is_lb_pkt = qlcnic_82xx_is_lb_pkt(sts_data0);
+		qlcnic_add_lb_filter(adapter, skb, is_lb_pkt,
+				     cpu_to_le16(t_vid));
+	}
+
 	if (length > rds_ring->skb_size)
 		skb_put(skb, rds_ring->skb_size);
 	else
@@ -985,8 +1073,8 @@ qlcnic_process_lro(struct qlcnic_adapter *adapter,
 	struct ipv6hdr *ipv6h;
 	struct tcphdr *th;
 	bool push, timestamp;
-	int index, l2_hdr_offset, l4_hdr_offset;
-	u16 lro_length, length, data_offset, vid = 0xffff;
+	int index, l2_hdr_offset, l4_hdr_offset, is_lb_pkt;
+	u16 lro_length, length, data_offset, t_vid, vid = 0xffff;
 	u32 seq_number;
 
 	if (unlikely(ring > adapter->max_rds_rings))
@@ -1011,6 +1099,14 @@ qlcnic_process_lro(struct qlcnic_adapter *adapter,
 	if (!skb)
 		return buffer;
 
+	if (adapter->drv_mac_learn &&
+	    (adapter->flags & QLCNIC_ESWITCH_ENABLED)) {
+		t_vid = 0;
+		is_lb_pkt = qlcnic_82xx_is_lb_pkt(sts_data0);
+		qlcnic_add_lb_filter(adapter, skb, is_lb_pkt,
+				     cpu_to_le16(t_vid));
+	}
+
 	if (timestamp)
 		data_offset = l4_hdr_offset + QLC_TCP_TS_HDR_SIZE;
 	else
@@ -1357,6 +1453,17 @@ void qlcnic_82xx_napi_disable(struct qlcnic_adapter *adapter)
 	}
 }
 
+#define QLC_83XX_NORMAL_LB_PKT	(1ULL << 36)
+#define QLC_83XX_LRO_LB_PKT	(1ULL << 46)
+
+static inline int qlcnic_83xx_is_lb_pkt(u64 sts_data, int lro_pkt)
+{
+	if (lro_pkt)
+		return (sts_data & QLC_83XX_LRO_LB_PKT) ? 1 : 0;
+	else
+		return (sts_data & QLC_83XX_NORMAL_LB_PKT) ? 1 : 0;
+}
+
 static struct qlcnic_rx_buffer *
 qlcnic_83xx_process_rcv(struct qlcnic_adapter *adapter,
 			struct qlcnic_host_sds_ring *sds_ring,
@@ -1367,8 +1474,8 @@ qlcnic_83xx_process_rcv(struct qlcnic_adapter *adapter,
 	struct qlcnic_rx_buffer *buffer;
 	struct sk_buff *skb;
 	struct qlcnic_host_rds_ring *rds_ring;
-	int index, length, cksum;
-	u16 vid = 0xffff;
+	int index, length, cksum, is_lb_pkt;
+	u16 vid = 0xffff, t_vid;
 
 	if (unlikely(ring >= adapter->max_rds_rings))
 		return NULL;
@@ -1386,6 +1493,14 @@ qlcnic_83xx_process_rcv(struct qlcnic_adapter *adapter,
 	if (!skb)
 		return buffer;
 
+	if (adapter->drv_mac_learn &&
+	    (adapter->flags & QLCNIC_ESWITCH_ENABLED)) {
+		t_vid = 0;
+		is_lb_pkt = qlcnic_83xx_is_lb_pkt(sts_data[1], 0);
+		qlcnic_add_lb_filter(adapter, skb, is_lb_pkt,
+				     cpu_to_le16(t_vid));
+	}
+
 	if (length > rds_ring->skb_size)
 		skb_put(skb, rds_ring->skb_size);
 	else
@@ -1424,9 +1539,9 @@ qlcnic_83xx_process_lro(struct qlcnic_adapter *adapter,
 	struct tcphdr *th;
 	bool push;
 	int l2_hdr_offset, l4_hdr_offset;
-	int index;
+	int index, is_lb_pkt;
 	u16 lro_length, length, data_offset, gso_size;
-	u16 vid = 0xffff;
+	u16 vid = 0xffff, t_vid;
 
 	if (unlikely(ring > adapter->max_rds_rings))
 		return NULL;
@@ -1447,6 +1562,14 @@ qlcnic_83xx_process_lro(struct qlcnic_adapter *adapter,
 	skb = qlcnic_process_rxbuf(adapter, rds_ring, index, STATUS_CKSUM_OK);
 	if (!skb)
 		return buffer;
+
+	if (adapter->drv_mac_learn &&
+	    (adapter->flags & QLCNIC_ESWITCH_ENABLED)) {
+		t_vid = 0;
+		is_lb_pkt = qlcnic_83xx_is_lb_pkt(sts_data[1], 1);
+		qlcnic_add_lb_filter(adapter, skb, is_lb_pkt,
+				     cpu_to_le16(t_vid));
+	}
 	if (qlcnic_83xx_is_tstamp(sts_data[1]))
 		data_offset = l4_hdr_offset + QLCNIC_TCP_TS_HDR_SIZE;
 	else
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index e03017a999b..5d5fd06c4b4 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -2208,6 +2208,7 @@ void qlcnic_alloc_lb_filters_mem(struct qlcnic_adapter *adapter)
 
 	act_pci_func = adapter->ahw->act_pci_func;
 	spin_lock_init(&adapter->mac_learn_lock);
+	spin_lock_init(&adapter->rx_mac_learn_lock);
 
 	if (qlcnic_82xx_check(adapter)) {
 		filter_size = QLCNIC_LB_MAX_FILTERS;
@@ -2231,6 +2232,20 @@ void qlcnic_alloc_lb_filters_mem(struct qlcnic_adapter *adapter)
 
 	for (i = 0; i < adapter->fhash.fbucket_size; i++)
 		INIT_HLIST_HEAD(&adapter->fhash.fhead[i]);
+
+	adapter->rx_fhash.fbucket_size = adapter->fhash.fbucket_size;
+
+	head = kcalloc(adapter->rx_fhash.fbucket_size,
+		       sizeof(struct hlist_head), GFP_ATOMIC);
+
+	if (!head)
+		return;
+
+	adapter->rx_fhash.fmax = (filter_size / act_pci_func);
+	adapter->rx_fhash.fhead = head;
+
+	for (i = 0; i < adapter->rx_fhash.fbucket_size; i++)
+		INIT_HLIST_HEAD(&adapter->rx_fhash.fhead[i]);
 }
 
 static void qlcnic_free_lb_filters_mem(struct qlcnic_adapter *adapter)
@@ -2240,6 +2255,12 @@ static void qlcnic_free_lb_filters_mem(struct qlcnic_adapter *adapter)
 
 	adapter->fhash.fhead = NULL;
 	adapter->fhash.fmax = 0;
+
+	if (adapter->rx_fhash.fmax && adapter->rx_fhash.fhead)
+		kfree(adapter->rx_fhash.fhead);
+
+	adapter->rx_fhash.fmax = 0;
+	adapter->rx_fhash.fhead = NULL;
 }
 
 int qlcnic_check_temp(struct qlcnic_adapter *adapter)