[PATCH] Add VLAN support in ALB mode

Add capability to tag self generated ARP packets that are required
for receive load balancing in bonding. VLAN Id's are saved and used
each time a new IP connection is established since 8021q currently
supports IP binding.

Update module version and comment blocks.

drivers/net/bonding/bond_alb.c

@@ -34,6 +34,9 @@
  *
  * 2003/12/30 - Amir Noam <amir.noam at intel dot com>
  *	- Fixed: Cannot remove and re-enslave the original active slave.
+ *
+ * 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Add capability to tag self generated packets in ALB/TLB modes.
  */
 
 //#define BONDING_DEBUG 1
@@ -499,13 +502,33 @@ static void rlb_update_client(struct rlb_client_info *client_info)
 	}
 
 	for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
-		arp_send(ARPOP_REPLY, ETH_P_ARP,
-			 client_info->ip_dst,
-			 client_info->slave->dev,
-			 client_info->ip_src,
-			 client_info->mac_dst,
-			 client_info->slave->dev->dev_addr,
-			 client_info->mac_dst);
+		struct sk_buff *skb;
+
+		skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
+				 client_info->ip_dst,
+				 client_info->slave->dev,
+				 client_info->ip_src,
+				 client_info->mac_dst,
+				 client_info->slave->dev->dev_addr,
+				 client_info->mac_dst);
+		if (!skb) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: failed to create an ARP packet\n");
+			continue;
+		}
+
+		skb->dev = client_info->slave->dev;
+
+		if (client_info->tag) {
+			skb = vlan_put_tag(skb, client_info->vlan_id);
+			if (!skb) {
+				printk(KERN_ERR DRV_NAME
+				       ": Error: failed to insert VLAN tag\n");
+				continue;
+			}
+		}
+
+		arp_xmit(skb);
 	}
 }
 
@@ -604,9 +627,10 @@ static void rlb_req_update_subnet_clients(struct bonding *bond, u32 src_ip)
 }
 
 /* Caller must hold both bond and ptr locks for read */
-struct slave *rlb_choose_channel(struct bonding *bond, struct arp_pkt *arp)
+struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
 {
 	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+	struct arp_pkt *arp = (struct arp_pkt *)skb->nh.raw;
 	struct slave *assigned_slave;
 	struct rlb_client_info *client_info;
 	u32 hash_index = 0;
@@ -662,6 +686,15 @@ struct slave *rlb_choose_channel(struct bonding *bond, struct arp_pkt *arp)
 			client_info->ntt = 0;
 		}
 
+		if (!list_empty(&bond->vlan_list)) {
+			unsigned short vlan_id;
+			int res = vlan_get_tag(skb, &vlan_id);
+			if (!res) {
+				client_info->tag = 1;
+				client_info->vlan_id = vlan_id;
+			}
+		}
+
 		if (!client_info->assigned) {
 			u32 prev_tbl_head = bond_info->rx_hashtbl_head;
 			bond_info->rx_hashtbl_head = hash_index;
@@ -692,7 +725,7 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 		/* the arp must be sent on the selected
 		* rx channel
 		*/
-		tx_slave = rlb_choose_channel(bond, arp);
+		tx_slave = rlb_choose_channel(skb, bond);
 		if (tx_slave) {
 			memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
 		}
@@ -703,7 +736,7 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 		 * When the arp reply is received the entry will be updated
 		 * with the correct unicast address of the client.
 		 */
-		rlb_choose_channel(bond, arp);
+		rlb_choose_channel(skb, bond);
 
 		/* The ARP relpy packets must be delayed so that
 		 * they can cancel out the influence of the ARP request.
@@ -809,6 +842,40 @@ static void rlb_deinitialize(struct bonding *bond)
 
 	kfree(bond_info->rx_hashtbl);
 	bond_info->rx_hashtbl = NULL;
+	bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
+
+	_unlock_rx_hashtbl(bond);
+}
+
+static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
+{
+	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+	u32 curr_index;
+
+	_lock_rx_hashtbl(bond);
+
+	curr_index = bond_info->rx_hashtbl_head;
+	while (curr_index != RLB_NULL_INDEX) {
+		struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
+		u32 next_index = bond_info->rx_hashtbl[curr_index].next;
+		u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
+
+		if (curr->tag && (curr->vlan_id == vlan_id)) {
+			if (curr_index == bond_info->rx_hashtbl_head) {
+				bond_info->rx_hashtbl_head = next_index;
+			}
+			if (prev_index != RLB_NULL_INDEX) {
+				bond_info->rx_hashtbl[prev_index].next = next_index;
+			}
+			if (next_index != RLB_NULL_INDEX) {
+				bond_info->rx_hashtbl[next_index].prev = prev_index;
+			}
+
+			rlb_init_table_entry(curr);
+		}
+
+		curr_index = next_index;
+	}
 
 	_unlock_rx_hashtbl(bond);
 }
@@ -1616,5 +1683,9 @@ void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
 	    (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
 		bond->alb_info.current_alb_vlan = NULL;
 	}
+
+	if (bond->alb_info.rlb_enabled) {
+		rlb_clear_vlan(bond, vlan_id);
+	}
 }
 

drivers/net/bonding/bond_alb.h

@@ -77,6 +77,8 @@ struct rlb_client_info {
 	u8  assigned;		/* checking whether this entry is assigned */
 	u8  ntt;		/* flag - need to transmit client info */
 	struct slave *slave;	/* the slave assigned to this client */
+	u8 tag;			/* flag - need to tag skb */
+	unsigned short vlan_id;	/* VLAN tag associated with IP address */
 };
 
 struct tlb_slave_info {

drivers/net/bonding/bond_main.c

@@ -455,12 +455,20 @@
  *
  * 2003/12/30 - Amir Noam <amir.noam at intel dot com>
  *	- Fixed: Cannot remove and re-enslave the original active slave.
- *	- Fixed: Releasing the original active slave causes mac address duplication.
+ *	- Fixed: Releasing the original active slave causes mac address
+ *		 duplication.
  *	- Add support for slaves that use ethtool_ops.
  *	  Set version to 2.5.3.
  *
  * 2004/01/05 - Amir Noam <amir.noam at intel dot com>
  *	- Save bonding parameters per bond instead of using the global values.
+ *	  Set version to 2.5.4.
+ *
+ * 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Enhance VLAN support:
+ *	  * Add support for VLAN hardware acceleration capable slaves.
+ *	  * Add capability to tag self generated packets in ALB/TLB modes.
+ *	  Set version to 2.6.0.
  */
 
 //#define BONDING_DEBUG 1

drivers/net/bonding/bonding.h

@@ -36,8 +36,8 @@
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
-#define DRV_VERSION	"2.5.4"
-#define DRV_RELDATE	"December 30, 2003"
+#define DRV_VERSION	"2.6.0"
+#define DRV_RELDATE	"January 14, 2004"
 #define DRV_NAME	"bonding"
 #define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"