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bonding: xor/802.3ad improved slave hash 

Add support for alternate slave selection algorithms to bonding
balance-xor and 802.3ad modes.  Default mode (what we have now: xor of
MAC addresses) is "layer2", new choice is "layer3+4", using IP and port
information for hashing to select peer.

Originally submitted by Jason Gabler for balance-xor mode;
modified by Jay Vosburgh to additionally support 802.3ad mode.  Jason's
original comment is as follows:

The attached patch to the Linux Etherchannel Bonding driver modifies the
driver's "balance-xor" mode as follows:

      - alternate hashing policy support for mode 2
        * Added kernel parameter "xmit_policy" to allow the specification
          of different hashing policies for mode 2.  The original mode 2
          policy is the default, now found in xmit_hash_policy_layer2().
        * Added xmit_hash_policy_layer34()

This patch was inspired by hashing policies implemented by Cisco,
Foundry and IBM, which are explained in
Foundry documentation found at:
http://www.foundrynet.com/services/documentation/sribcg/Trunking.html#112750

Signed-off-by: Jason Gabler <jygabler@lbl.gov>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
This commit is contained in:
Jay Vosburgh 2005-06-26 17:54:11 -04:00 committed by Jeff Garzik
parent c3ade5cad0
commit 169a3e6663
4 changed files with 114 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/bonding/bond_3ad.c
View File

@ -2346,7 +2346,6 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
{
struct slave *slave, *start_at;
struct bonding *bond = dev->priv;
struct ethhdr *data = (struct ethhdr *)skb->data;
int slave_agg_no;
int slaves_in_agg;
int agg_id;
@ -2377,7 +2376,7 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
goto out;
}
slave_agg_no = (data->h_dest[5]^bond->dev->dev_addr[5]) % slaves_in_agg;
slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
bond_for_each_slave(bond, slave, i) {
struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;

107
drivers/net/bonding/bond_main.c
View File

@ -479,6 +479,14 @@
* - Support for generating gratuitous ARPs in active-backup mode.
* Includes support for VLAN tagging all bonding-generated ARPs
* as needed. Set version to 2.6.2.
* 2005/06/08 - Jason Gabler <jygabler at lbl dot gov>
* - alternate hashing policy support for mode 2
* * Added kernel parameter "xmit_hash_policy" to allow the selection
* of different hashing policies for mode 2. The original mode 2
* policy is the default, now found in xmit_hash_policy_layer2().
* * Added xmit_hash_policy_layer34()
* - Modified by Jay Vosburgh <fubar@us.ibm.com> to also support mode 4.
* Set version to 2.6.3.
*/
//#define BONDING_DEBUG 1
@ -493,7 +501,10 @@
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <net/ip.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
@ -541,6 +552,7 @@ static int use_carrier = 1;
static char *mode = NULL;
static char *primary = NULL;
static char *lacp_rate = NULL;
static char *xmit_hash_policy = NULL;
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
@ -560,6 +572,8 @@ module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner (slow/fast)");
module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method : 0 for layer 2 (default), 1 for layer 3+4");
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
@ -579,6 +593,7 @@ static struct proc_dir_entry *bond_proc_dir = NULL;
static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
static int arp_ip_count = 0;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
static int lacp_fast = 0;
static int app_abi_ver = 0;
static int orig_app_abi_ver = -1; /* This is used to save the first ABI version
@ -588,7 +603,6 @@ static int orig_app_abi_ver = -1; /* This is used to save the first ABI version
* command comes from an application using
* another ABI version.
*/
struct bond_parm_tbl {
char *modename;
int mode;
@ -611,9 +625,15 @@ static struct bond_parm_tbl bond_mode_tbl[] = {
{ NULL, -1},
};
static struct bond_parm_tbl xmit_hashtype_tbl[] = {
{ "layer2", BOND_XMIT_POLICY_LAYER2},
{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
{ NULL, -1},
};
/*-------------------------- Forward declarations ---------------------------*/
static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode);
static inline void bond_set_mode_ops(struct bonding *bond, int mode);
static void bond_send_gratuitous_arp(struct bonding *bond);
/*---------------------------- General routines -----------------------------*/
@ -3724,6 +3744,46 @@ static void bond_unregister_lacpdu(struct bonding *bond)
dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
}
/*---------------------------- Hashing Policies -----------------------------*/
/*
* Hash for the the output device based upon layer 3 and layer 4 data. If
* the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
* altogether not IP, mimic bond_xmit_hash_policy_l2()
*/
static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
struct iphdr *iph = skb->nh.iph;
u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
int layer4_xor = 0;
if (skb->protocol == __constant_htons(ETH_P_IP)) {
if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
(iph->protocol == IPPROTO_TCP ||
iph->protocol == IPPROTO_UDP)) {
layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
}
return (layer4_xor ^
((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
}
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*
* Hash for the output device based upon layer 2 data
*/
static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*-------------------------- Device entry points ----------------------------*/
static int bond_open(struct net_device *bond_dev)
@ -4310,14 +4370,13 @@ out:
}
/*
* in XOR mode, we determine the output device by performing xor on
* the source and destination hw adresses. If this device is not
* enabled, find the next slave following this xor slave.
* In bond_xmit_xor() , we determine the output device by using a pre-
* determined xmit_hash_policy(), If the selected device is not enabled,
* find the next active slave.
*/
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct ethhdr *data = (struct ethhdr *)skb->data;
struct slave *slave, *start_at;
int slave_no;
int i;
@ -4329,7 +4388,7 @@ static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
goto out;
}
slave_no = (data->h_dest[5]^bond_dev->dev_addr[5]) % bond->slave_cnt;
slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
bond_for_each_slave(bond, slave, i) {
slave_no--;
@ -4425,8 +4484,10 @@ out:
/*
* set bond mode specific net device operations
*/
static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode)
static inline void bond_set_mode_ops(struct bonding *bond, int mode)
{
struct net_device *bond_dev = bond->dev;
switch (mode) {
case BOND_MODE_ROUNDROBIN:
bond_dev->hard_start_xmit = bond_xmit_roundrobin;
@ -4436,12 +4497,20 @@ static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode)
break;
case BOND_MODE_XOR:
bond_dev->hard_start_xmit = bond_xmit_xor;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
break;
case BOND_MODE_BROADCAST:
bond_dev->hard_start_xmit = bond_xmit_broadcast;
break;
case BOND_MODE_8023AD:
bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
@ -4490,7 +4559,7 @@ static int __init bond_init(struct net_device *bond_dev, struct bond_params *par
bond_dev->change_mtu = bond_change_mtu;
bond_dev->set_mac_address = bond_set_mac_address;
bond_set_mode_ops(bond_dev, bond->params.mode);
bond_set_mode_ops(bond, bond->params.mode);
bond_dev->destructor = free_netdev;
@ -4601,6 +4670,25 @@ static int bond_check_params(struct bond_params *params)
}
}
if (xmit_hash_policy) {
if ((bond_mode != BOND_MODE_XOR) &&
(bond_mode != BOND_MODE_8023AD)) {
printk(KERN_INFO DRV_NAME
": xor_mode param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
xmit_hashtype = bond_parse_parm(xmit_hash_policy,
xmit_hashtype_tbl);
if (xmit_hashtype == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid xmit_hash_policy \"%s\"\n",
xmit_hash_policy == NULL ? "NULL" :
xmit_hash_policy);
return -EINVAL;
}
}
}
if (lacp_rate) {
if (bond_mode != BOND_MODE_8023AD) {
printk(KERN_INFO DRV_NAME
@ -4812,6 +4900,7 @@ static int bond_check_params(struct bond_params *params)
/* fill params struct with the proper values */
params->mode = bond_mode;
params->xmit_policy = xmit_hashtype;
params->miimon = miimon;
params->arp_interval = arp_interval;
params->updelay = updelay;

10
drivers/net/bonding/bonding.h
View File

@ -25,6 +25,10 @@
*
* 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Code cleanup and style changes
*
* 2005/05/05 - Jason Gabler <jygabler at lbl dot gov>
* - added "xmit_policy" kernel parameter for alternate hashing policy
* support for mode 2
*/
#ifndef _LINUX_BONDING_H
@ -36,8 +40,8 @@
#include "bond_3ad.h"
#include "bond_alb.h"
#define DRV_VERSION "2.6.2"
#define DRV_RELDATE "June 5, 2005"
#define DRV_VERSION "2.6.3"
#define DRV_RELDATE "June 8, 2005"
#define DRV_NAME "bonding"
#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
@ -137,6 +141,7 @@
struct bond_params {
int mode;
int xmit_policy;
int miimon;
int arp_interval;
int use_carrier;
@ -198,6 +203,7 @@ struct bonding {
#endif /* CONFIG_PROC_FS */
struct list_head bond_list;
struct dev_mc_list *mc_list;
int (*xmit_hash_policy)(struct sk_buff *, struct net_device *, int);
u32 master_ip;
u16 flags;
struct ad_bond_info ad_info;

7
include/linux/if_bonding.h
View File

@ -35,6 +35,9 @@
*
* 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Code cleanup and style changes
*
* 2005/05/05 - Jason Gabler <jygabler at lbl dot gov>
* - added definitions for various XOR hashing policies
*/
#ifndef _LINUX_IF_BONDING_H
@ -80,6 +83,10 @@
#define BOND_DEFAULT_MAX_BONDS 1 /* Default maximum number of devices to support */
/* hashing types */
#define BOND_XMIT_POLICY_LAYER2 0 /* layer 2 (MAC only), default */
#define BOND_XMIT_POLICY_LAYER34 1 /* layer 3+4 (IP ^ MAC) */
typedef struct ifbond {
__s32 bond_mode;
__s32 num_slaves;