Subject: [RFC PATCH net-next] bonding: add a vlan+srcmac tx hashing option

From: Jarod Wilson <[email-masked]>
Date: Fri, 18 Dec 2020 14:30:33 -0500

This comes from an end-user request, where they're running multiple VMs on
hosts with bonded interfaces connected to some interest switch topologies,
where 802.3ad isn't an option. They're currently running a proprietary
solution that effectively achieves load-balancing of VMs and bandwidth
utilization improvements with a similar form of transmission algorithm.

Basically, each VM has it's own vlan, so it always sends its traffic out
the same interface, unless that interface fails. Traffic gets split
between the interfaces, maintaining a consistent path, with failover still
available if an interface goes down.

This has been rudimetarily tested to provide similar results, suitable for
them to use to move off their current proprietary solution.

Still on the TODO list, if these even looks sane to begin with, is
fleshing out Documentation/networking/bonding.rst.

Cc: Jay Vosburgh <[email-masked]>
Cc: Veaceslav Falico <[email-masked]>
Cc: Andy Gospodarek <[email-masked]>
Cc: "David S. Miller" <[email-masked]>
Cc: Jakub Kicinski <[email-masked]>
Cc: Thomas Davis <[email-masked]>
Cc: [email-masked]
Signed-off-by: Jarod Wilson <[email-masked]>
---
 drivers/net/bonding/bond_main.c    | 27 +++++++++++++++++++++++++--
 drivers/net/bonding/bond_options.c |  1 +
 include/linux/netdevice.h          |  1 +
 include/uapi/linux/if_bonding.h    |  1 +
 4 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5fe5232cc3f3..151ce8c7a56f 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -164,7 +164,7 @@ module_param(xmit_hash_policy, charp, 0);
 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 				   "0 for layer 2 (default), 1 for layer 3+4, "
 				   "2 for layer 2+3, 3 for encap layer 2+3, "
-				   "4 for encap layer 3+4");
+				   "4 for encap layer 3+4, 5 for vlan+srcmac");
 module_param(arp_interval, int, 0);
 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 module_param_array(arp_ip_target, charp, NULL, 0);
@@ -1434,6 +1434,8 @@ static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
 		return NETDEV_LAG_HASH_E23;
 	case BOND_XMIT_POLICY_ENCAP34:
 		return NETDEV_LAG_HASH_E34;
+	case BOND_XMIT_POLICY_VLAN_SRCMAC:
+		return NETDEV_LAG_HASH_VLAN_SRCMAC;
 	default:
 		return NETDEV_LAG_HASH_UNKNOWN;
 	}
@@ -3494,6 +3496,20 @@ static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
 	return true;
 }
 
+static inline u32 bond_vlan_srcmac_hash(struct sk_buff *skb)
+{
+	struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
+	u32 srcmac = mac_hdr->h_source[5];
+	u16 vlan;
+
+	if (!skb_vlan_tag_present(skb))
+		return srcmac;
+
+	vlan = skb_vlan_tag_get(skb);
+
+	return srcmac ^ vlan;
+}
+
 /* Extract the appropriate headers based on bond's xmit policy */
 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
 			      struct flow_keys *fk)
@@ -3501,10 +3517,14 @@ static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
 	bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
 	int noff, proto = -1;
 
-	if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
+	switch (bond->params.xmit_policy) {
+	case BOND_XMIT_POLICY_ENCAP23:
+	case BOND_XMIT_POLICY_ENCAP34:
 		memset(fk, 0, sizeof(*fk));
 		return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
 					  fk, NULL, 0, 0, 0, 0);
+	default:
+		break;
 	}
 
 	fk->ports.ports = 0;
@@ -3556,6 +3576,9 @@ u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
 	    skb->l4_hash)
 		return skb->hash;
 
+	if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
+		return bond_vlan_srcmac_hash(skb);
+
 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
 	    !bond_flow_dissect(bond, skb, &flow))
 		return bond_eth_hash(skb);
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index a4e4e15f574d..9826fe46fca1 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -101,6 +101,7 @@ static const struct bond_opt_value bond_xmit_hashtype_tbl[] = {
 	{ "layer2+3", BOND_XMIT_POLICY_LAYER23, 0},
 	{ "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0},
 	{ "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0},
+	{ "vlansrc",  BOND_XMIT_POLICY_VLAN_SRCMAC,  0},
 	{ NULL,       -1,                       0},
 };
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7bf167993c05..551eac4ab747 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2633,6 +2633,7 @@ enum netdev_lag_hash {
 	NETDEV_LAG_HASH_L23,
 	NETDEV_LAG_HASH_E23,
 	NETDEV_LAG_HASH_E34,
+	NETDEV_LAG_HASH_VLAN_SRCMAC,
 	NETDEV_LAG_HASH_UNKNOWN,
 };
 
diff --git a/include/uapi/linux/if_bonding.h b/include/uapi/linux/if_bonding.h
index 45f3750aa861..e8eb4ad03cf1 100644
--- a/include/uapi/linux/if_bonding.h
+++ b/include/uapi/linux/if_bonding.h
@@ -94,6 +94,7 @@
 #define BOND_XMIT_POLICY_LAYER23	2 /* layer 2+3 (IP ^ MAC) */
 #define BOND_XMIT_POLICY_ENCAP23	3 /* encapsulated layer 2+3 */
 #define BOND_XMIT_POLICY_ENCAP34	4 /* encapsulated layer 3+4 */
+#define BOND_XMIT_POLICY_VLAN_SRCMAC	5 /* vlan + source MAC */
 
 /* 802.3ad port state definitions (43.4.2.2 in the 802.3ad standard) */
 #define LACP_STATE_LACP_ACTIVITY   0x1
-- 
2.29.2