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Message-Id: <1423270316-9311-1-git-send-email-maheshb@google.com>
Date:	Fri,  6 Feb 2015 16:51:56 -0800
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Veaceslav Falico <vfalico@...il.com>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	David Miller <davem@...emloft.net>
Cc:	Mahesh Bandewar <maheshb@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH next 5/6] bonding: Allow userspace to set macaddr on bonding-dev

This patch allows user-space to set the mac-address on the bonding device.
This mac-address can not be NULL or a Multicast. If the mac-address is set
from user-space; kernel will honor it and will not overwrite it. In the
absense (value from user space); the logic will default to using the
masters' mac as the mac address for the bonding device.

It can be set using example code below -

   # modprobe bonding mode=4
   # sys_mac_addr=$(printf '%02x:%02x:%02x:%02x:%02x:%02x' \
                    $(( (RANDOM & 0xFE) | 0x02 )) \
                    $(( RANDOM & 0xFF )) \
                    $(( RANDOM & 0xFF )) \
                    $(( RANDOM & 0xFF )) \
                    $(( RANDOM & 0xFF )) \
                    $(( RANDOM & 0xFF )))
   # echo $sys_mac_addr > /sys/class/net/bond0/bonding/ad_actor_system_mac_address
   # echo +eth1 > /sys/class/net/bond0/bonding/slaves
   ...
   # ip link set bond0 up

Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
---
 drivers/net/bonding/bond_3ad.c     |  7 ++++++-
 drivers/net/bonding/bond_main.c    |  1 +
 drivers/net/bonding/bond_options.c | 29 +++++++++++++++++++++++++++++
 drivers/net/bonding/bond_procfs.c  |  6 ++++++
 drivers/net/bonding/bond_sysfs.c   | 16 ++++++++++++++++
 include/net/bond_options.h         |  1 +
 include/net/bonding.h              |  1 +
 7 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 1177f96194dd..373d3db3809f 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1914,7 +1914,12 @@ void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
 
 		BOND_AD_INFO(bond).system.sys_priority =
 			bond->params.ad_actor_sysprio;
-		BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
+		if (is_zero_ether_addr(bond->params.ad_actor_sys_macaddr))
+			BOND_AD_INFO(bond).system.sys_mac_addr =
+			    *((struct mac_addr *)bond->dev->dev_addr);
+		else
+			BOND_AD_INFO(bond).system.sys_mac_addr =
+			    *((struct mac_addr *)bond->params.ad_actor_sys_macaddr);
 
 		/* initialize how many times this module is called in one
 		 * second (should be about every 100ms)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 561b2bde5aeb..1a6735ef2ea7 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4440,6 +4440,7 @@ static int bond_check_params(struct bond_params *params)
 	params->packets_per_slave = packets_per_slave;
 	params->tlb_dynamic_lb = 1; /* Default value */
 	params->ad_actor_sysprio = ad_actor_sysprio;
+	eth_zero_addr(params->ad_actor_sys_macaddr);
 	if (packets_per_slave > 0) {
 		params->reciprocal_packets_per_slave =
 			reciprocal_value(packets_per_slave);
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index d8f6760143ae..330d48b6a1e6 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -72,6 +72,8 @@ static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
 				  const struct bond_opt_value *newval);
 static int bond_option_ad_actor_sysprio_set(struct bonding *bond,
 				  const struct bond_opt_value *newval);
+static int bond_option_ad_actor_sys_macaddr_set(struct bonding *bond,
+				  const struct bond_opt_value *newval);
 
 
 static const struct bond_opt_value bond_mode_tbl[] = {
@@ -396,6 +398,13 @@ static const struct bond_option bond_opts[BOND_OPT_LAST] = {
 		.values = bond_ad_actor_sysprio_tbl,
 		.set = bond_option_ad_actor_sysprio_set,
 	},
+	[BOND_OPT_AD_ACTOR_SYS_MACADDR] = {
+		.id = BOND_OPT_AD_ACTOR_SYS_MACADDR,
+		.name = "ad_actor_system_mac_address",
+		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
+		.flags = BOND_OPTFLAG_RAWVAL | BOND_OPTFLAG_IFDOWN,
+		.set = bond_option_ad_actor_sys_macaddr_set,
+	},
 };
 
 /* Searches for an option by name */
@@ -1376,3 +1385,23 @@ static int bond_option_ad_actor_sysprio_set(struct bonding *bond,
 	bond->params.ad_actor_sysprio = newval->value;
 	return 0;
 }
+
+static int bond_option_ad_actor_sys_macaddr_set(struct bonding *bond,
+					    const struct bond_opt_value *newval)
+{
+	u8 macaddr[ETH_ALEN];
+	int i;
+
+	i = sscanf(newval->string, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+		   &macaddr[0], &macaddr[1], &macaddr[2],
+		   &macaddr[3], &macaddr[4], &macaddr[5]);
+
+	if (i != ETH_ALEN || !is_valid_ether_addr(macaddr)) {
+		netdev_err(bond->dev, "Invalid MAC address.\n");
+		return -EINVAL;
+	}
+
+	ether_addr_copy(bond->params.ad_actor_sys_macaddr, macaddr);
+
+	return 0;
+}
diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c
index 9e33c48886ef..81452ced852f 100644
--- a/drivers/net/bonding/bond_procfs.c
+++ b/drivers/net/bonding/bond_procfs.c
@@ -136,6 +136,8 @@ static void bond_info_show_master(struct seq_file *seq)
 			   optval->string);
 		seq_printf(seq, "System priority: %d\n",
 				BOND_AD_INFO(bond).system.sys_priority);
+		seq_printf(seq, "System MAC address: %pM\n",
+				&BOND_AD_INFO(bond).system.sys_mac_addr);
 
 		if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
 			seq_printf(seq, "bond %s has no active aggregator\n",
@@ -198,6 +200,8 @@ static void bond_info_show_slave(struct seq_file *seq,
 			seq_puts(seq, "details actor lacp pdu:\n");
 			seq_printf(seq, "    system priority: %d\n",
 				   port->actor_system_priority);
+			seq_printf(seq, "    system mac address: %pM\n",
+				   &port->actor_system);
 			seq_printf(seq, "    port key: %d\n",
 				   port->actor_oper_port_key);
 			seq_printf(seq, "    port priority: %d\n",
@@ -210,6 +214,8 @@ static void bond_info_show_slave(struct seq_file *seq,
 			seq_puts(seq, "details partner lacp pdu:\n");
 			seq_printf(seq, "    system priority: %d\n",
 				   port->partner_oper.system_priority);
+			seq_printf(seq, "    system mac address: %pM\n",
+				   &port->partner_oper.system);
 			seq_printf(seq, "    oper key: %d\n",
 				   port->partner_oper.key);
 			seq_printf(seq, "    port priority: %d\n",
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 4350aa06f867..91713d0b6685 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -706,6 +706,21 @@ static ssize_t bonding_show_ad_actor_sysprio(struct device *d,
 static DEVICE_ATTR(ad_actor_system_priority, S_IRUGO | S_IWUSR,
 		   bonding_show_ad_actor_sysprio, bonding_sysfs_store_option);
 
+static ssize_t bonding_show_ad_actor_sys_macaddr(struct device *d,
+						 struct device_attribute *attr,
+						 char *buf)
+{
+	struct bonding *bond = to_bond(d);
+
+	if (BOND_MODE(bond) == BOND_MODE_8023AD)
+		return sprintf(buf, "%pM\n", bond->params.ad_actor_sys_macaddr);
+
+	return 0;
+}
+static DEVICE_ATTR(ad_actor_system_mac_address, S_IRUGO | S_IWUSR,
+		   bonding_show_ad_actor_sys_macaddr,
+		   bonding_sysfs_store_option);
+
 static struct attribute *per_bond_attrs[] = {
 	&dev_attr_slaves.attr,
 	&dev_attr_mode.attr,
@@ -740,6 +755,7 @@ static struct attribute *per_bond_attrs[] = {
 	&dev_attr_packets_per_slave.attr,
 	&dev_attr_tlb_dynamic_lb.attr,
 	&dev_attr_ad_actor_system_priority.attr,
+	&dev_attr_ad_actor_system_mac_address.attr,
 	NULL,
 };
 
diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index c2af1db37354..993ef73cd050 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -64,6 +64,7 @@ enum {
 	BOND_OPT_SLAVES,
 	BOND_OPT_TLB_DYNAMIC_LB,
 	BOND_OPT_AD_ACTOR_SYSPRIO,
+	BOND_OPT_AD_ACTOR_SYS_MACADDR,
 	BOND_OPT_LAST
 };
 
diff --git a/include/net/bonding.h b/include/net/bonding.h
index 7a5c79fcf866..cd2092e6bc71 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -144,6 +144,7 @@ struct bond_params {
 	int tlb_dynamic_lb;
 	struct reciprocal_value reciprocal_packets_per_slave;
 	u16 ad_actor_sysprio;
+	u8 ad_actor_sys_macaddr[ETH_ALEN];
 };
 
 struct bond_parm_tbl {
-- 
2.2.0.rc0.207.ga3a616c

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