[PATCH net-next v6 0/7] bonding: Extend arp_ip_target format to allow for a list of vlan tags.

[PATCH net-next v6 0/7] bonding: Extend arp_ip_target format to allow for a list of vlan tags.

[David Wilder]

The current implementation of the arp monitor builds a list of vlan-tags by
following the chain of net_devices above the bond. See bond_verify_device_path().
Unfortunately, with some configurations, this is not possible. One example is
when an ovs switch is configured above the bond.

This change extends the "arp_ip_target" parameter format to allow for a list of
vlan tags to be included for each arp target. This new list of tags is optional
and may be omitted to preserve the current format and process of discovering
vlans.

The new format for arp_ip_target is:
arp_ip_target ipv4-address[vlan-tag\...],...

For example:
arp_ip_target 10.0.0.1[10/20]
arp_ip_target 10.0.0.1[] (used to disable vlan discovery)

Changes since V5: Only the last 2 patches have changed since V5.
1) Fixed sparse warning in bond_fill_info().
2) Also in bond_fill_info() I resolved data.addr uninitialized when if condition is not met.
Thank you Simon for catching this. Note: The change is different that what I shared earlier.
3) Fixed shellcheck warnings in test script: Blocked source warning, Ignored specific unassigned
references and exported ALL_TESTS to resolve a reference warning.

Changes since V4:
1)Dropped changes to proc and sysfs APIs to bonding.  These APIs 
do not need to be updated to support new functionality.  Netlink
and iproute2 have been updated to do the right thing, but the
other APIs are more or less frozen in the past.

2)Jakub reported a warning triggered in bond_info_seq_show() during
testing.  I was unable to reproduce this warning or identify
it with code inspection.  However, all my changes to bond_info_seq_show()
have been dropped as unnecessary (see above).
Hopefully this will resolve the issue. 

3)Selftest script has been updated based on the results of shellcheck.
Two unresolved references that are not possible to resolve are all
that remain.

4)A patch was added updating bond_info_fill()
to support "ip -d show <bond-device>" command.

The inclusion of a list of vlan tags is optional. The new logic
preserves both forward and backward compatibility with the kernel
and iproute2 versions.

Changes since V3:
1) Moved the parsing of the extended arp_ip_target out of the kernel and into
   userspace (ip command). A separate patch to iproute2 to follow shortly.
2) Split up the patch set to make review easier.

Please see iproute changes in a separate posting.

Thank you for your time and reviews.

Signed-off-by: David Wilder <wilder@us.ibm.com>

David Wilder (7):
  bonding: Adding struct bond_arp_target
  bonding: Adding extra_len field to struct bond_opt_value.
  bonding: arp_ip_target helpers.
  bonding: Processing extended arp_ip_target from user space.
  bonding: Update to bond_arp_send_all() to use supplied vlan tags
  bonding: Update for extended arp_ip_target format.
  bonding: Selftest and documentation for the arp_ip_target parameter.

 Documentation/networking/bonding.rst          |  11 ++
 drivers/net/bonding/bond_main.c               |  47 +++--
 drivers/net/bonding/bond_netlink.c            |  34 +++-
 drivers/net/bonding/bond_options.c            |  95 +++++++---
 drivers/net/bonding/bond_procfs.c             |   4 +-
 drivers/net/bonding/bond_sysfs.c              |   4 +-
 include/net/bond_options.h                    |  29 ++-
 include/net/bonding.h                         |  61 +++++-
 .../selftests/drivers/net/bonding/Makefile    |   3 +-
 .../drivers/net/bonding/bond-arp-ip-target.sh | 178 ++++++++++++++++++
 10 files changed, 393 insertions(+), 73 deletions(-)
 create mode 100755 tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh

-- 
2.43.5

[PATCH net-next v6 1/7] bonding: Adding struct bond_arp_target

[David Wilder]

Replacing the definition of bond_params.arp_targets (__be32 arp_targets[])
with:

struct bond_arp_target {
	__be32			target_ip;
	struct bond_vlan_tag	*tags;
	u32			flags;
};

To provide storage for a list of vlan tags for each target.

All references to arp_target are change to use the new structure.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 drivers/net/bonding/bond_main.c    | 29 ++++++++++++++++-------------
 drivers/net/bonding/bond_netlink.c |  4 ++--
 drivers/net/bonding/bond_options.c | 18 +++++++++---------
 drivers/net/bonding/bond_procfs.c  |  4 ++--
 drivers/net/bonding/bond_sysfs.c   |  4 ++--
 include/net/bond_options.h         | 20 ++++++++++++++++++++
 include/net/bonding.h              | 15 +++++----------
 7 files changed, 56 insertions(+), 38 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 17c7542be6a5..7e938077bbde 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3163,26 +3163,29 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
 {
 	struct rtable *rt;
 	struct bond_vlan_tag *tags;
-	__be32 *targets = bond->params.arp_targets, addr;
+	struct bond_arp_target *targets = bond->params.arp_targets;
+	__be32 target_ip, addr;
 	int i;
 
-	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
+	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i].target_ip; i++) {
+		target_ip = targets[i].target_ip;
+		tags = targets[i].tags;
+
 		slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
-			  __func__, &targets[i]);
-		tags = NULL;
+			  __func__, &target_ip);
 
 		/* Find out through which dev should the packet go */
-		rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 0, 0,
+		rt = ip_route_output(dev_net(bond->dev), target_ip, 0, 0, 0,
 				     RT_SCOPE_LINK);
 		if (IS_ERR(rt)) {
-			/* there's no route to target - try to send arp
+			/* there's no route to target_ip - try to send arp
 			 * probe to generate any traffic (arp_validate=0)
 			 */
 			if (bond->params.arp_validate)
 				pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
 					     bond->dev->name,
-					     &targets[i]);
-			bond_arp_send(slave, ARPOP_REQUEST, targets[i],
+					     &target_ip);
+			bond_arp_send(slave, ARPOP_REQUEST, target_ip,
 				      0, tags);
 			continue;
 		}
@@ -3200,15 +3203,15 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
 
 		/* Not our device - skip */
 		slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
-			   &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
+			   &target_ip, rt->dst.dev ? rt->dst.dev->name : "NULL");
 
 		ip_rt_put(rt);
 		continue;
 
 found:
-		addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
+		addr = bond_confirm_addr(rt->dst.dev, target_ip, 0);
 		ip_rt_put(rt);
-		bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
+		bond_arp_send(slave, ARPOP_REQUEST, target_ip, addr, tags);
 		kfree(tags);
 	}
 }
@@ -6164,7 +6167,7 @@ static int __init bond_check_params(struct bond_params *params)
 	int arp_all_targets_value = 0;
 	u16 ad_actor_sys_prio = 0;
 	u16 ad_user_port_key = 0;
-	__be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
+	struct bond_arp_target arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
 	int arp_ip_count;
 	int bond_mode	= BOND_MODE_ROUNDROBIN;
 	int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
@@ -6358,7 +6361,7 @@ static int __init bond_check_params(struct bond_params *params)
 			arp_interval = 0;
 		} else {
 			if (bond_get_targets_ip(arp_target, ip) == -1)
-				arp_target[arp_ip_count++] = ip;
+				arp_target[arp_ip_count++].target_ip = ip;
 			else
 				pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
 					&ip);
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 57fff2421f1b..9939e28dedd9 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -700,8 +700,8 @@ static int bond_fill_info(struct sk_buff *skb,
 
 	targets_added = 0;
 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
-		if (bond->params.arp_targets[i]) {
-			if (nla_put_be32(skb, i, bond->params.arp_targets[i]))
+		if (bond->params.arp_targets[i].target_ip) {
+			if (nla_put_be32(skb, i, bond->params.arp_targets[i].target_ip))
 				goto nla_put_failure;
 			targets_added = 1;
 		}
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index 1d639a3be6ba..e04487f8d79a 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -1113,7 +1113,7 @@ static int bond_option_arp_interval_set(struct bonding *bond,
 			netdev_dbg(bond->dev, "ARP monitoring cannot be used with MII monitoring. Disabling MII monitoring\n");
 			bond->params.miimon = 0;
 		}
-		if (!bond->params.arp_targets[0])
+		if (!bond->params.arp_targets[0].target_ip)
 			netdev_dbg(bond->dev, "ARP monitoring has been set up, but no ARP targets have been specified\n");
 	}
 	if (bond->dev->flags & IFF_UP) {
@@ -1141,20 +1141,20 @@ static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
 					    __be32 target,
 					    unsigned long last_rx)
 {
-	__be32 *targets = bond->params.arp_targets;
+	struct bond_arp_target *targets = bond->params.arp_targets;
 	struct list_head *iter;
 	struct slave *slave;
 
 	if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) {
 		bond_for_each_slave(bond, slave, iter)
 			slave->target_last_arp_rx[slot] = last_rx;
-		targets[slot] = target;
+		targets[slot].target_ip = target;
 	}
 }
 
 static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
 {
-	__be32 *targets = bond->params.arp_targets;
+	struct bond_arp_target *targets = bond->params.arp_targets;
 	int ind;
 
 	if (!bond_is_ip_target_ok(target)) {
@@ -1189,7 +1189,7 @@ static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
 
 static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
 {
-	__be32 *targets = bond->params.arp_targets;
+	struct bond_arp_target *targets = bond->params.arp_targets;
 	struct list_head *iter;
 	struct slave *slave;
 	unsigned long *targets_rx;
@@ -1208,20 +1208,20 @@ static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
 		return -EINVAL;
 	}
 
-	if (ind == 0 && !targets[1] && bond->params.arp_interval)
+	if (ind == 0 && !targets[1].target_ip && bond->params.arp_interval)
 		netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n");
 
 	netdev_dbg(bond->dev, "Removing ARP target %pI4\n", &target);
 
 	bond_for_each_slave(bond, slave, iter) {
 		targets_rx = slave->target_last_arp_rx;
-		for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
+		for (i = ind; (i < BOND_MAX_ARP_TARGETS - 1) && targets[i + 1].target_ip; i++)
 			targets_rx[i] = targets_rx[i+1];
 		targets_rx[i] = 0;
 	}
-	for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
+	for (i = ind; (i < BOND_MAX_ARP_TARGETS - 1) && targets[i + 1].target_ip; i++)
 		targets[i] = targets[i+1];
-	targets[i] = 0;
+	targets[i].target_ip = 0;
 
 	return 0;
 }
diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c
index 7edf72ec816a..94e6fd7041ee 100644
--- a/drivers/net/bonding/bond_procfs.c
+++ b/drivers/net/bonding/bond_procfs.c
@@ -121,11 +121,11 @@ static void bond_info_show_master(struct seq_file *seq)
 		seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
 
 		for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
-			if (!bond->params.arp_targets[i])
+			if (!bond->params.arp_targets[i].target_ip)
 				break;
 			if (printed)
 				seq_printf(seq, ",");
-			seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
+			seq_printf(seq, " %pI4", &bond->params.arp_targets[i].target_ip);
 			printed = 1;
 		}
 		seq_printf(seq, "\n");
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 1e13bb170515..d7c09e0a14dd 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -290,9 +290,9 @@ static ssize_t bonding_show_arp_targets(struct device *d,
 	int i, res = 0;
 
 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
-		if (bond->params.arp_targets[i])
+		if (bond->params.arp_targets[i].target_ip)
 			res += sysfs_emit_at(buf, res, "%pI4 ",
-					     &bond->params.arp_targets[i]);
+					     &bond->params.arp_targets[i].target_ip);
 	}
 	if (res)
 		buf[res-1] = '\n'; /* eat the leftover space */
diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index 022b122a9fb6..b7f275bc33a1 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -120,6 +120,26 @@ struct bond_option {
 	int (*set)(struct bonding *bond, const struct bond_opt_value *val);
 };
 
+struct bond_vlan_tag {
+	__be16		vlan_proto;
+	unsigned short	vlan_id;
+};
+
+/* Value type flags:
+ *  BOND_TARGET_DONTFREE - never free the tags
+ *  BOND_TARGET_USERTAGS - tags have been supplied by the user
+ */
+enum {
+	BOND_TARGET_DONTFREE = BIT(0),
+	BOND_TARGET_USERTAGS = BIT(1),
+};
+
+struct bond_arp_target {
+	__be32			target_ip;
+	struct bond_vlan_tag	*tags;
+	u32			flags;
+};
+
 int __bond_opt_set(struct bonding *bond, unsigned int option,
 		   struct bond_opt_value *val,
 		   struct nlattr *bad_attr, struct netlink_ext_ack *extack);
diff --git a/include/net/bonding.h b/include/net/bonding.h
index e06f0d63b2c1..27fbce667a4c 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -137,7 +137,7 @@ struct bond_params {
 	int ad_select;
 	char primary[IFNAMSIZ];
 	int primary_reselect;
-	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
+	struct bond_arp_target arp_targets[BOND_MAX_ARP_TARGETS];
 	int tx_queues;
 	int all_slaves_active;
 	int resend_igmp;
@@ -277,11 +277,6 @@ struct bonding {
 void bond_queue_slave_event(struct slave *slave);
 void bond_lower_state_changed(struct slave *slave);
 
-struct bond_vlan_tag {
-	__be16		vlan_proto;
-	unsigned short	vlan_id;
-};
-
 /*
  * Returns NULL if the net_device does not belong to any of the bond's slaves
  *
@@ -525,7 +520,7 @@ static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 	int i = 1;
 	unsigned long ret = slave->target_last_arp_rx[0];
 
-	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
+	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i].target_ip; i++)
 		if (time_before(slave->target_last_arp_rx[i], ret))
 			ret = slave->target_last_arp_rx[i];
 
@@ -763,14 +758,14 @@ static inline bool bond_slave_has_mac_rcu(struct bonding *bond, const u8 *mac)
 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
  * Returns -1 if not found, index if found
  */
-static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
+static inline int bond_get_targets_ip(struct bond_arp_target *targets, __be32 ip)
 {
 	int i;
 
 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
-		if (targets[i] == ip)
+		if (targets[i].target_ip == ip)
 			return i;
-		else if (targets[i] == 0)
+		else if (targets[i].target_ip == 0)
 			break;
 
 	return -1;
-- 
2.43.5

[PATCH net-next v6 2/7] bonding: Adding extra_len field to struct bond_opt_value.

[David Wilder]

Used to record the size of the extra array.

__bond_opt_init() is updated to set extra_len.
BOND_OPT_EXTRA_MAXLEN is increased from 16 to 64.

This is needed for the extended  arp_ip_target option.
The ip command will now pass a variable length value when
setting arp_ip_target.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 include/net/bond_options.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index b7f275bc33a1..b95023bf40c3 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -86,14 +86,15 @@ enum {
  * - if value != ULLONG_MAX -> parse value
  * - if string != NULL -> parse string
  * - if the opt is RAW data and length less than maxlen,
- *   copy the data to extra storage
+ *   copy the data to extra storage, extra_len is set to the size of data copied.
  */
 
-#define BOND_OPT_EXTRA_MAXLEN 16
+#define BOND_OPT_EXTRA_MAXLEN 64
 struct bond_opt_value {
 	char *string;
 	u64 value;
 	u32 flags;
+	u16 extra_len;
 	union {
 		char extra[BOND_OPT_EXTRA_MAXLEN];
 		struct net_device *slave_dev;
@@ -168,8 +169,10 @@ static inline void __bond_opt_init(struct bond_opt_value *optval,
 	else if (string)
 		optval->string = string;
 
-	if (extra && extra_len <= BOND_OPT_EXTRA_MAXLEN)
+	if (extra && extra_len <= BOND_OPT_EXTRA_MAXLEN) {
 		memcpy(optval->extra, extra, extra_len);
+		optval->extra_len = extra_len;
+	}
 }
 #define bond_opt_initval(optval, value) __bond_opt_init(optval, NULL, value, NULL, 0)
 #define bond_opt_initstr(optval, str) __bond_opt_init(optval, str, ULLONG_MAX, NULL, 0)
-- 
2.43.5

[PATCH net-next v6 3/7] bonding: arp_ip_target helpers.

[David Wilder]

Adding helpers and defines needed for extending the
arp_ip_target parameters.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 include/net/bonding.h | 45 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/include/net/bonding.h b/include/net/bonding.h
index 27fbce667a4c..1989b71ffa16 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -809,4 +809,49 @@ static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *s
 	return NET_XMIT_DROP;
 }
 
+/* Helpers for handling arp_ip_target */
+#define BOND_OPTION_STRING_MAX_SIZE 64
+#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
+
+static inline char *bond_arp_target_to_string(struct bond_arp_target *target,
+					    char *buf, int size)
+{
+	struct bond_vlan_tag *tags = target->tags;
+	int i, num = 0;
+
+	if (!(target->flags & BOND_TARGET_USERTAGS)) {
+		num = snprintf(&buf[0], size, "%pI4", &target->target_ip);
+		return buf;
+	}
+
+	num = snprintf(&buf[0], size, "%pI4[", &target->target_ip);
+	if (tags) {
+		for (i = 0; (tags[i].vlan_proto != BOND_VLAN_PROTO_NONE); i++) {
+			if (!tags[i].vlan_id)
+				continue;
+			if (i != 0)
+				num = num + snprintf(&buf[num], size-num, "/");
+			num = num + snprintf(&buf[num], size-num, "%u",
+					     tags[i].vlan_id);
+		}
+	}
+	snprintf(&buf[num], size-num, "]");
+	return buf;
+}
+
+static inline void bond_free_vlan_tag(struct bond_arp_target *target)
+{
+	kfree(target->tags);
+}
+
+static inline void __bond_free_vlan_tags(struct bond_arp_target *targets)
+{
+	int i;
+
+	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i].tags; i++)
+		bond_free_vlan_tag(&targets[i]);
+}
+
+#define bond_free_vlan_tags(targets)  __bond_free_vlan_tags(targets)
+
 #endif /* _NET_BONDING_H */
-- 
2.43.5

[PATCH net-next v6 4/7] bonding: Processing extended arp_ip_target from user space.

[David Wilder]

Changes to bond_netlink and bond_options to process extended
format arp_ip_target option sent from user space via the ip
command.

The extended format adds a list of vlan tags to the ip target address.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 drivers/net/bonding/bond_netlink.c |  5 +-
 drivers/net/bonding/bond_options.c | 81 +++++++++++++++++++++---------
 2 files changed, 60 insertions(+), 26 deletions(-)

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 9939e28dedd9..5486ef40907e 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -293,9 +293,10 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			if (nla_len(attr) < sizeof(target))
 				return -EINVAL;
 
-			target = nla_get_be32(attr);
+			bond_opt_initextra(&newval,
+					   (__force void *)nla_data(attr),
+					   nla_len(attr));
 
-			bond_opt_initval(&newval, (__force u64)target);
 			err = __bond_opt_set(bond, BOND_OPT_ARP_TARGETS,
 					     &newval,
 					     data[IFLA_BOND_ARP_IP_TARGET],
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index e04487f8d79a..1455e7f15c31 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -31,8 +31,8 @@ static int bond_option_use_carrier_set(struct bonding *bond,
 				       const struct bond_opt_value *newval);
 static int bond_option_arp_interval_set(struct bonding *bond,
 					const struct bond_opt_value *newval);
-static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target);
-static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target);
+static int bond_option_arp_ip_target_add(struct bonding *bond, struct bond_arp_target target);
+static int bond_option_arp_ip_target_rem(struct bonding *bond, struct bond_arp_target target);
 static int bond_option_arp_ip_targets_set(struct bonding *bond,
 					  const struct bond_opt_value *newval);
 static int bond_option_ns_ip6_targets_set(struct bonding *bond,
@@ -1138,7 +1138,7 @@ static int bond_option_arp_interval_set(struct bonding *bond,
 }
 
 static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
-					    __be32 target,
+					    struct bond_arp_target target,
 					    unsigned long last_rx)
 {
 	struct bond_arp_target *targets = bond->params.arp_targets;
@@ -1148,24 +1148,25 @@ static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
 	if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) {
 		bond_for_each_slave(bond, slave, iter)
 			slave->target_last_arp_rx[slot] = last_rx;
-		targets[slot].target_ip = target;
+		memcpy(&targets[slot], &target, sizeof(target));
 	}
 }
 
-static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
+static int _bond_option_arp_ip_target_add(struct bonding *bond, struct bond_arp_target target)
 {
 	struct bond_arp_target *targets = bond->params.arp_targets;
+	char pbuf[BOND_OPTION_STRING_MAX_SIZE];
 	int ind;
 
-	if (!bond_is_ip_target_ok(target)) {
+	if (!bond_is_ip_target_ok(target.target_ip)) {
 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for addition\n",
-			   &target);
+			   &target.target_ip);
 		return -EINVAL;
 	}
 
-	if (bond_get_targets_ip(targets, target) != -1) { /* dup */
+	if (bond_get_targets_ip(targets, target.target_ip) != -1) { /* dup */
 		netdev_err(bond->dev, "ARP target %pI4 is already present\n",
-			   &target);
+			   &target.target_ip);
 		return -EINVAL;
 	}
 
@@ -1175,43 +1176,44 @@ static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
 		return -EINVAL;
 	}
 
-	netdev_dbg(bond->dev, "Adding ARP target %pI4\n", &target);
+	netdev_dbg(bond->dev, "Adding ARP target %s\n",
+		   bond_arp_target_to_string(&target, pbuf, sizeof(pbuf)));
 
 	_bond_options_arp_ip_target_set(bond, ind, target, jiffies);
 
 	return 0;
 }
 
-static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
+static int bond_option_arp_ip_target_add(struct bonding *bond, struct bond_arp_target target)
 {
 	return _bond_option_arp_ip_target_add(bond, target);
 }
 
-static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
+static int bond_option_arp_ip_target_rem(struct bonding *bond, struct bond_arp_target target)
 {
 	struct bond_arp_target *targets = bond->params.arp_targets;
+	unsigned long *targets_rx;
 	struct list_head *iter;
 	struct slave *slave;
-	unsigned long *targets_rx;
 	int ind, i;
 
-	if (!bond_is_ip_target_ok(target)) {
+	if (!bond_is_ip_target_ok(target.target_ip)) {
 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for removal\n",
-			   &target);
+			   &target.target_ip);
 		return -EINVAL;
 	}
 
-	ind = bond_get_targets_ip(targets, target);
+	ind = bond_get_targets_ip(targets, target.target_ip);
 	if (ind == -1) {
 		netdev_err(bond->dev, "unable to remove nonexistent ARP target %pI4\n",
-			   &target);
+			   &target.target_ip);
 		return -EINVAL;
 	}
 
 	if (ind == 0 && !targets[1].target_ip && bond->params.arp_interval)
 		netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n");
 
-	netdev_dbg(bond->dev, "Removing ARP target %pI4\n", &target);
+	netdev_dbg(bond->dev, "Removing ARP target %pI4\n", &target.target_ip);
 
 	bond_for_each_slave(bond, slave, iter) {
 		targets_rx = slave->target_last_arp_rx;
@@ -1219,30 +1221,45 @@ static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
 			targets_rx[i] = targets_rx[i+1];
 		targets_rx[i] = 0;
 	}
-	for (i = ind; (i < BOND_MAX_ARP_TARGETS - 1) && targets[i + 1].target_ip; i++)
-		targets[i] = targets[i+1];
+
+	bond_free_vlan_tag(&targets[ind]);
+
+	for (i = ind; (i < BOND_MAX_ARP_TARGETS - 1) && targets[i + 1].target_ip; i++) {
+		targets[i].target_ip = targets[i + 1].target_ip;
+		targets[i].tags = targets[i + 1].tags;
+		targets[i].flags = targets[i + 1].flags;
+	}
 	targets[i].target_ip = 0;
+	targets[i].flags = 0;
+	targets[i].tags = NULL;
 
 	return 0;
 }
 
 void bond_option_arp_ip_targets_clear(struct bonding *bond)
 {
+	struct bond_arp_target empty_target;
 	int i;
 
+	empty_target.target_ip = 0;
+	empty_target.tags = NULL;
+
 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
-		_bond_options_arp_ip_target_set(bond, i, 0, 0);
+		_bond_options_arp_ip_target_set(bond, i, empty_target, 0);
 }
 
 static int bond_option_arp_ip_targets_set(struct bonding *bond,
 					  const struct bond_opt_value *newval)
 {
+	size_t len = (size_t)newval->extra_len;
+	char *extra = (char *)newval->extra;
+	struct bond_arp_target target;
 	int ret = -EPERM;
-	__be32 target;
 
 	if (newval->string) {
+		/* Adding or removing arp_ip_target from sysfs */
 		if (strlen(newval->string) < 1 ||
-		    !in4_pton(newval->string + 1, -1, (u8 *)&target, -1, NULL)) {
+		    !in4_pton(newval->string + 1, -1, (u8 *)&target.target_ip, -1, NULL)) {
 			netdev_err(bond->dev, "invalid ARP target specified\n");
 			return ret;
 		}
@@ -1253,7 +1270,23 @@ static int bond_option_arp_ip_targets_set(struct bonding *bond,
 		else
 			netdev_err(bond->dev, "no command found in arp_ip_targets file - use +<addr> or -<addr>\n");
 	} else {
-		target = newval->value;
+		/* Adding arp_ip_target from netlink. aka: ip command */
+		if (len < sizeof(target.target_ip)) {
+			netdev_err(bond->dev, "invalid ARP target specified\n");
+			return ret;
+		}
+		memcpy(&target.target_ip, newval->extra, sizeof(__be32));
+		len = len - sizeof(target.target_ip);
+		extra = extra + sizeof(target.target_ip);
+
+		if (len)
+			target.tags = kmalloc(len, GFP_ATOMIC);
+
+		if (target.tags) {
+			memcpy(target.tags, extra, len);
+			target.flags |= BOND_TARGET_USERTAGS;
+		}
+
 		ret = bond_option_arp_ip_target_add(bond, target);
 	}
 
-- 
2.43.5

[PATCH net-next v6 5/7] bonding: Update to bond_arp_send_all() to use supplied vlan tags

[David Wilder]

bond_arp_send_all() will pass the vlan tags supplied by
the user to bond_arp_send(). If vlan tags have not been
supplied the vlans in the path to the target will be
discovered by bond_verify_device_path(). The discovered
vlan tags are then saved to be used on future calls to
bond_arp_send().

bonding_exit() is also updated to free vlan tags when a
bond is destroyed.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 drivers/net/bonding/bond_main.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 7e938077bbde..2f153c89e401 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3161,18 +3161,19 @@ struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 
 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
 {
-	struct rtable *rt;
-	struct bond_vlan_tag *tags;
 	struct bond_arp_target *targets = bond->params.arp_targets;
+	char pbuf[BOND_OPTION_STRING_MAX_SIZE];
+	struct bond_vlan_tag *tags;
 	__be32 target_ip, addr;
+	struct rtable *rt;
 	int i;
 
 	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i].target_ip; i++) {
 		target_ip = targets[i].target_ip;
 		tags = targets[i].tags;
 
-		slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
-			  __func__, &target_ip);
+		slave_dbg(bond->dev, slave->dev, "%s: target %s\n", __func__,
+			  bond_arp_target_to_string(&targets[i], pbuf, sizeof(pbuf)));
 
 		/* Find out through which dev should the packet go */
 		rt = ip_route_output(dev_net(bond->dev), target_ip, 0, 0, 0,
@@ -3194,9 +3195,13 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
 		if (rt->dst.dev == bond->dev)
 			goto found;
 
-		rcu_read_lock();
-		tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
-		rcu_read_unlock();
+		if (!tags) {
+			rcu_read_lock();
+			tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
+			/* cache the tags */
+			targets[i].tags = tags;
+			rcu_read_unlock();
+		}
 
 		if (!IS_ERR_OR_NULL(tags))
 			goto found;
@@ -3212,7 +3217,6 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
 		addr = bond_confirm_addr(rt->dst.dev, target_ip, 0);
 		ip_rt_put(rt);
 		bond_arp_send(slave, ARPOP_REQUEST, target_ip, addr, tags);
-		kfree(tags);
 	}
 }
 
@@ -6732,7 +6736,7 @@ static void __exit bonding_exit(void)
 
 	bond_netlink_fini();
 	unregister_pernet_subsys(&bond_net_ops);
-
+	bond_free_vlan_tags(bonding_defaults.arp_targets);
 	bond_destroy_debugfs();
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
-- 
2.43.5

[PATCH net-next v6 6/7] bonding: Update for extended arp_ip_target format.

[David Wilder]

Updated bond_fill_info() to support extended arp_ip_target format.

Forward and backward compatibility between the kernel and iprout2 is
preserved.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 drivers/net/bonding/bond_netlink.c | 29 +++++++++++++++++++++++++++--
 include/net/bonding.h              |  1 +
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 5486ef40907e..64d314dc3c7e 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -701,8 +701,33 @@ static int bond_fill_info(struct sk_buff *skb,
 
 	targets_added = 0;
 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
-		if (bond->params.arp_targets[i].target_ip) {
-			if (nla_put_be32(skb, i, bond->params.arp_targets[i].target_ip))
+		struct bond_arp_target *target = &bond->params.arp_targets[i];
+		struct Data {
+			__be32 addr;
+			struct bond_vlan_tag vlans[BOND_MAX_VLAN_TAGS + 1];
+		} data;
+		int size = 0, level;
+
+		if (!target->target_ip)
+			break;
+
+		data.addr = target->target_ip;
+		size = sizeof(target->target_ip);
+
+		for (level = 0; target->flags & BOND_TARGET_USERTAGS && target->tags; level++) {
+			if (level > BOND_MAX_VLAN_TAGS)
+				goto nla_put_failure;
+
+			memcpy(&data.vlans[level], &target->tags[level],
+			       sizeof(struct bond_vlan_tag));
+			size = size + sizeof(struct bond_vlan_tag);
+
+			if (target->tags[level].vlan_proto == BOND_VLAN_PROTO_NONE)
+				break;
+		}
+
+		if (size) {
+			if (nla_put(skb, i, size, &data))
 				goto nla_put_failure;
 			targets_added = 1;
 		}
diff --git a/include/net/bonding.h b/include/net/bonding.h
index 1989b71ffa16..2502cf8428b3 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -811,6 +811,7 @@ static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *s
 
 /* Helpers for handling arp_ip_target */
 #define BOND_OPTION_STRING_MAX_SIZE 64
+#define BOND_MAX_VLAN_TAGS 5
 #define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
 
 static inline char *bond_arp_target_to_string(struct bond_arp_target *target,
-- 
2.43.5

[PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[David Wilder]

This selftest provided a functional test for the arp_ip_target parameter
both with and without user supplied vlan tags.

and

Updates to the bonding documentation.

Signed-off-by: David Wilder <wilder@us.ibm.com>
---
 Documentation/networking/bonding.rst          |  11 ++
 .../selftests/drivers/net/bonding/Makefile    |   3 +-
 .../drivers/net/bonding/bond-arp-ip-target.sh | 178 ++++++++++++++++++
 3 files changed, 191 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh

diff --git a/Documentation/networking/bonding.rst b/Documentation/networking/bonding.rst
index f8f5766703d4..4a80da56b784 100644
--- a/Documentation/networking/bonding.rst
+++ b/Documentation/networking/bonding.rst
@@ -313,6 +313,17 @@ arp_ip_target
 	maximum number of targets that can be specified is 16.  The
 	default value is no IP addresses.
 
+        When an arp_ip_target is configured the bonding driver will
+        attempt to automatically determine what vlans the arp probe will
+        pass through. This process of gathering vlan tags is required
+        for the arp probe to be sent. However, in some configurations
+        this process may fail. In these cases you may manually
+        supply a list of vlan tags. To specify a list of vlan tags
+        append the ipv4 address with [tag1/tag2...]. For example:
+        arp_ip_target=10.0.0.1[10]. If you simply need to disable the
+        vlan discovery process you may provide an empty list, for example:
+        arp_ip_target=10.0.0.1[].
+
 ns_ip6_target
 
 	Specifies the IPv6 addresses to use as IPv6 monitoring peers when
diff --git a/tools/testing/selftests/drivers/net/bonding/Makefile b/tools/testing/selftests/drivers/net/bonding/Makefile
index 2b10854e4b1e..c59bb2912a38 100644
--- a/tools/testing/selftests/drivers/net/bonding/Makefile
+++ b/tools/testing/selftests/drivers/net/bonding/Makefile
@@ -10,7 +10,8 @@ TEST_PROGS := \
 	mode-2-recovery-updelay.sh \
 	bond_options.sh \
 	bond-eth-type-change.sh \
-	bond_macvlan_ipvlan.sh
+	bond_macvlan_ipvlan.sh \
+	bond-arp-ip-target.sh
 
 TEST_FILES := \
 	lag_lib.sh \
diff --git a/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh b/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
new file mode 100755
index 000000000000..aea6b282cea6
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
@@ -0,0 +1,178 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Test bonding arp_ip_target.
+# Topology for Bond mode 1,5,6 testing
+#
+#  +-------------------------+
+#  |                         | Server
+#  |        bond0.10.20      | 192.20.2.1/24
+#  |            |            |
+#  |         bond0.10        | 192.10.2.1/24
+#  |            |            |
+#  |          bond0          | 192.0.2.1/24
+#  |            |            |
+#  |            +            |
+#  |      eth0  |  eth1      |
+#  |        +---+---+        |
+#  |        |       |        |
+#  +-------------------------+
+#           |       |
+#  +-------------------------+
+#  |        |       |        |
+#  |    +---+-------+---+    |  Gateway
+#  |    |      br0      |    |
+#  |    +-------+-------+    |
+#  |            |            |
+#  +-------------------------+
+#               |
+#  +-------------------------+
+#  |            |            |  Client
+#  |          eth0           | 192.0.0.2/24
+#  |            |            |
+#  |         eth0.10         | 192.10.10.2/24
+#  |            |            |
+#  |        eth0.10.20       | 192.20.20.2/24
+#  +-------------------------+
+
+lib_dir=$(dirname "$0")
+
+# shellcheck source=/dev/null # Ignore source warning.
+source "${lib_dir}"/bond_topo_2d1c.sh
+
+# shellcheck disable=SC2154 # Ignore unassigned referenced warning.
+echo "${c_ns}" "${s_ns}" > /dev/null
+
+DEBUG=${DEBUG:-0}
+test "${DEBUG}" -ne 0 && set -x
+
+# vlan subnets
+c_ip4="192.0.2.10"
+c_ip4v10="192.10.2.10"
+c_ip4v20="192.20.2.10"
+
+export ALL_TESTS="
+    no_vlan_hints
+    with_vlan_hints
+"
+
+# Build stacked vlans on top of an interface.
+stack_vlans()
+{
+    RET=0
+    local interface="$1"
+    local ns=$2
+    local last="$interface"
+    local tags="10 20"
+
+    if ! ip -n "${ns}" link show "${interface}" > /dev/null; then
+        RET=1
+        msg="Failed to create ${interface}"
+        return
+    fi
+
+    if [ "$ns" == "${s_ns}" ]; then host=1; else host=10;fi
+
+    for tag in $tags; do
+        ip -n "${ns}" link add link "$last" name "$last"."$tag" type vlan id "$tag"
+        ip -n "${ns}" address add 192."$tag".2."$host"/24 dev "$last"."$tag"
+        ip -n "${ns}" link set up dev "$last"."$tag"
+        last=$last.$tag
+    done
+}
+
+# Check for link flapping
+check_failure_count()
+{
+    RET=0
+    local ns=$1
+    local proc_file=/proc/net/bonding/$2
+    local  counts
+
+    # Give the bond time to settle.
+    sleep 10
+
+    counts=$(ip netns exec "${ns}" grep -F "Link Failure Count" "${proc_file}" \
+	    | awk -F: '{print $2}')
+
+    local i
+    for i in $counts; do
+        [ "$i" != 0 ] && RET=1
+    done
+}
+
+setup_bond_topo()
+{
+    setup_prepare
+    setup_wait
+    stack_vlans bond0 "${s_ns}"
+    stack_vlans eth0 "${c_ns}"
+}
+
+skip_with_vlan_hints()
+{
+    # check if iproute supports arp_ip_target with vlans option.
+    if ! ip -n "${s_ns}" link add bond2 type bond arp_ip_target 10.0.0.1[10]; then
+        ip -n "${s_ns}" link del bond2 2> /dev/null
+        return 0
+    fi
+    return 1
+}
+
+no_vlan_hints()
+{
+        RET=0
+        local targets="${c_ip4} ${c_ip4v10} ${c_ip4v20}"
+        local target
+        msg=""
+
+        for target in $targets; do
+                bond_reset "mode $mode arp_interval 100 arp_ip_target ${target}"
+
+                stack_vlans bond0 "${s_ns}"
+                if [ $RET -ne 0 ]; then
+                    log_test "no_vlan_hints" "${msg}"
+                    return
+                fi
+
+                check_failure_count "${s_ns}" bond0
+                log_test "arp_ip_target=${target} ${msg}"
+        done
+}
+
+with_vlan_hints()
+{
+        RET=0
+        local targets="${c_ip4}[] ${c_ip4v10}[10] ${c_ip4v20}[10/20]"
+        local target
+        msg=""
+
+        if skip_with_vlan_hints; then
+            log_test_skip "skip_with_vlan_hints" \
+	          "Installed iproute doesn't support extended arp_ip_target options."
+            return 0
+        fi
+
+        for target in $targets; do
+                bond_reset "mode $mode arp_interval 100 arp_ip_target ${target}"
+
+                stack_vlans bond0 "${s_ns}"
+                if [ $RET -ne 0 ]; then
+                    log_test "no_vlan_hints" "${msg}"
+                    return
+                fi
+
+                check_failure_count "${s_ns}" bond0
+                log_test "arp_ip_target=${target} ${msg}"
+        done
+}
+
+
+trap cleanup EXIT
+
+mode=active-backup
+
+setup_bond_topo
+tests_run
+
+exit "$EXIT_STATUS"
-- 
2.43.5

Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[Jakub Kicinski]

On Fri, 18 Jul 2025 14:23:43 -0700 David Wilder wrote:
> This selftest provided a functional test for the arp_ip_target parameter
> both with and without user supplied vlan tags.
> 
> and
> 

Looks like something ate part of the commit message?

> Updates to the bonding documentation.

This test seems to reliably trigger a crash in our CI. Not sure if
something is different in our build... or pebkac?

[   17.977269] RIP: 0010:bond_fill_info+0x21b/0x890
[   17.977325] Code: b3 38 0b 00 00 31 d2 41 8b 06 85 c0 0f 84 2a 06 00 00 89 44 24 0c 41 f6 46 10 02 74 5c 49 8b 4e 08 31 c0 ba 04 00 00 00 eb 16 <8b> 34 01 83 c2 04 89 74 04 10 48 83 c0 04 66 83 7c 01 fc ff 74 3e
[   17.977478] RSP: 0018:ffffa4be0062f6f8 EFLAGS: 00010297
[   17.977524] RAX: 0000000000000000 RBX: ffff8e0906064000 RCX: 00ff8e0902fd5180
[   17.977616] RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffff8e0903655298
[   17.977682] RBP: ffff8e090321f900 R08: 0000000000000064 R09: 0000000000000000
[   17.977747] R10: ffff8e0903655298 R11: fefefefefefefeff R12: ffff8e0903655294
[   17.977807] R13: 0000000000000000 R14: ffff8e0906064b38 R15: ffff8e0903655248
[   17.977872] FS:  00007fd944f5c800(0000) GS:ffff8e0997f78000(0000) knlGS:0000000000000000
[   17.977945] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.978001] CR2: 00007fd9451ad430 CR3: 0000000006e04004 CR4: 0000000000772ef0
[   17.978062] PKRU: 55555554
[   17.978087] Call Trace:
[   17.978110]  <TASK>
[   17.978136]  ? dev_get_stats+0x6c/0x330
[   17.978174]  ? nla_reserve+0x53/0x80
[   17.978218]  rtnl_fill_ifinfo.constprop.0+0xa4d/0x1560
[   17.978272]  ? __alloc_skb+0x86/0x1a0
[   17.978306]  ? kmalloc_reserve+0x61/0xf0
[   17.978343]  ? kmalloc_reserve+0x61/0xf0
[   17.978379]  rtmsg_ifinfo_build_skb+0xa9/0x120
[   17.978427]  rtmsg_ifinfo+0x3c/0x90
[   17.978463]  __dev_notify_flags+0xb4/0xf0
[   17.978499]  ? queue_delayed_work_on+0x58/0x60
[   17.978553]  rtnl_configure_link+0x88/0xb0
[   17.978591]  rtnl_newlink+0x568/0xc10
[   17.978628]  ? __pfx_rtnl_newlink+0x10/0x10
[   17.978664]  rtnetlink_rcv_msg+0x362/0x410
[   17.978692]  ? timerqueue_add+0x6a/0xc0
[   17.978731]  ? timerqueue_del+0x2e/0x50
[   17.978765]  ? __remove_hrtimer+0x39/0x90
[   17.978804]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10
[   17.978856]  netlink_rcv_skb+0x57/0x110
[   17.978893]  netlink_unicast+0x25c/0x380
[   17.978928]  ? __alloc_skb+0xdb/0x1a0
[   17.978964]  netlink_sendmsg+0x1be/0x3e0
[   17.978995]  ____sys_sendmsg+0x2bd/0x320
[   17.979037]  ? copy_msghdr_from_user+0x6c/0xa0
[   17.979085]  ___sys_sendmsg+0x87/0xd0
[   17.979121]  ? __handle_mm_fault+0xa3f/0xe50
[   17.979168]  __sys_sendmsg+0x71/0xd0
[   17.979203]  do_syscall_64+0xa4/0x270
[   17.979243]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   17.979287] RIP: 0033:0x7fd9451291e7
[   17.979326] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
[   17.979475] RSP: 002b:00007ffe3779d578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   17.979546] RAX: ffffffffffffffda RBX: 00007ffe3779dcb0 RCX: 00007fd9451291e7
[   17.979621] RDX: 0000000000000000 RSI: 00007ffe3779d5e0 RDI: 0000000000000005
[   17.979696] RBP: 0000000000000006 R08: 0000000000000058 R09: 0000000000000000
[   17.979766] R10: 00007fd9450216f8 R11: 0000000000000246 R12: 00007ffe3779dcc8
[   17.979832] R13: 00000000687ae66c R14: 0000000000499600 R15: 00007ffe3779d6c8
[   17.979899]  </TASK>
[   17.979923] Modules linked in: [last unloaded: netdevsim]
[   17.979986] ---[ end trace 0000000000000000 ]---
[   17.980033] RIP: 0010:bond_fill_info+0x21b/0x890
[   17.980086] Code: b3 38 0b 00 00 31 d2 41 8b 06 85 c0 0f 84 2a 06 00 00 89 44 24 0c 41 f6 46 10 02 74 5c 49 8b 4e 08 31 c0 ba 04 00 00 00 eb 16 <8b> 34 01 83 c2 04 89 74 04 10 48 83 c0 04 66 83 7c 01 fc ff 74 3e
[   17.980238] RSP: 0018:ffffa4be0062f6f8 EFLAGS: 00010297
[   17.980278] RAX: 0000000000000000 RBX: ffff8e0906064000 RCX: 00ff8e0902fd5180
[   17.980346] RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffff8e0903655298
[   17.980411] RBP: ffff8e090321f900 R08: 0000000000000064 R09: 0000000000000000
[   17.980479] R10: ffff8e0903655298 R11: fefefefefefefeff R12: ffff8e0903655294
[   17.980542] R13: 0000000000000000 R14: ffff8e0906064b38 R15: ffff8e0903655248
[   17.980605] FS:  00007fd944f5c800(0000) GS:ffff8e0997f78000(0000) knlGS:0000000000000000
[   17.980674] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.980740] CR2: 00007fd9451ad430 CR3: 0000000006e04004 CR4: 0000000000772ef0
[   17.980808] PKRU: 55555554
[   17.981702] ip (1285) used greatest stack depth: 11664 bytes left
-- 
pw-bot: cr

RE: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[David Wilder]

________________________________________
From: Jakub Kicinski <kuba@kernel.org>
Sent: Friday, July 18, 2025 6:33 PM
To: David Wilder
Cc: netdev@vger.kernel.org; jv@jvosburgh.net; pradeeps@linux.vnet.ibm.com; Pradeep Satyanarayana; i.maximets@ovn.org; Adrian Moreno Zapata; Hangbin Liu; stephen@networkplumber.org; horms@kernel.org
Subject: [EXTERNAL] Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

>On Fri, 18 Jul 2025 14:23:43 -0700 David Wilder wrote:
>> This selftest provided a functional test for the arp_ip_target parameter
>> both with and without user supplied vlan tags.
>>
>> and
>>
>
>
>Looks like something ate part of the commit message?

That is odd, not sure what happened.

>> Updates to the bonding documentation.

>This test seems to reliably trigger a crash in our CI. Not sure if
>something is different in our build... or pebkac?
>
>[   17.977269] RIP: 0010:bond_fill_info+0x21b/0x890
>[   17.977325] Code: b3 38 0b 00 00 31 d2 41 8b 06 85 c0 0f 84 2a 06 00 00 89 44 24 0c 41 f6 46 10 02 74 5c 49 8b 4e 08 31 c0 ba 04 00 00 00 eb 16 <8b> 34 01 83 c2 04 89 74 04 10 48 83 c0 04 66 83 7c 01 fc ff 74 3e

Hi Jakub

What version of iproute2 is running in your CI?
Has my iproute2 change been applied? it's ok if not.

Send:
ip -V (please)

Can I access the logs from the CI run?

Is there a way I can debug in you CI environment?

Can I submit debug patches?

David Wilder

Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[Jakub Kicinski]

On Mon, 21 Jul 2025 19:23:19 +0000 David Wilder wrote:
> >This test seems to reliably trigger a crash in our CI. Not sure if
> >something is different in our build... or pebkac?
> >
> >[   17.977269] RIP: 0010:bond_fill_info+0x21b/0x890
> >[   17.977325] Code: b3 38 0b 00 00 31 d2 41 8b 06 85 c0 0f 84 2a 06 00 00 89 44 24 0c 41 f6 46 10 02 74 5c 49 8b 4e 08 31 c0 ba 04 00 00 00 eb 16 <8b> 34 01 83 c2 04 89 74 04 10 48 83 c0 04 66 83 7c 01 fc ff 74 3e  
> 
> Hi Jakub
> 
> What version of iproute2 is running in your CI?
> Has my iproute2 change been applied? it's ok if not.
> 
> Send:
> ip -V (please)

iproute2 is built from source a month ago, with some pending patches,
but not yours. Presumably building from source without your patches
should give similar effect (IIRC the patches I applied related
to MC routing)

> Can I access the logs from the CI run?

Yes

https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2025-07-19--00-00

> Is there a way I can debug in you CI environment?

Not at this point, unfortunately.

> Can I submit debug patches?

https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style

RE: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[David Wilder]

________________________________________
From: Jakub Kicinski <kuba@kernel.org>
Sent: Monday, July 21, 2025 1:08 PM
To: David Wilder
Cc: netdev@vger.kernel.org; jv@jvosburgh.net; pradeeps@linux.vnet.ibm.com; Pradeep Satyanarayana; i.maximets@ovn.org; Adrian Moreno Zapata; Hangbin Liu; stephen@networkplumber.org; horms@kernel.org
Subject: [EXTERNAL] Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

Hi Jakub

> On Mon, 21 Jul 2025 19:23:19 +0000 David Wilder wrote:
> > >This test seems to reliably trigger a crash in our CI. Not sure if
> > >something is different in our build... or pebkac?
> > >
> > >[   17.977269] RIP: 0010:bond_fill_info+0x21b/0x890
> > >[   17.977325] Code: b3 38 0b 00 00 31 d2 41 8b 06 85 c0 0f 84 2a 06 00 00 89 44 24 0c 41 f6 46 10 02 74 5c 49 8b 4e 08 31 c0 ba 04 00 00 00 eb 16 <8b> 34 01 83 c2 04 89 74 04 10 48 83 c0 04 66 83 7c 01 fc ff 74 3e
> >
> > Hi Jakub
> >
> > What version of iproute2 is running in your CI?
> > Has my iproute2 change been applied? it's ok if not.
> >
> > Send:
> > ip -V (please)
>
> iproute2 is built from source a month ago, with some pending patches,
> but not yours. Presumably building from source without your patches
> should give similar effect (IIRC the patches I applied related
> to MC routing)
>
> > Can I access the logs from the CI run?
>
> Yes
>
> https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2025-07-19--00-00 
>
> > Is there a way I can debug in you CI environment?
>
> Not at this point, unfortunately.
>
> > Can I submit debug patches?
>
> https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style 

I am able to run my tests in this environment, but sadly I still cant reproduce the failure.
Can you tell me more about the environment you are using for CI?  What version of GCC is used?
What distro and release is the environment build from?

I have made some changes to the function that is failing In an attempt to fix the problem.
If the problem continues with my next version would it be possible to save the build artifacts
used in the test (vmlinux)?

Thanks
David Wilder

Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[Jakub Kicinski]

On Fri, 8 Aug 2025 17:32:08 +0000 David Wilder wrote:
> > iproute2 is built from source a month ago, with some pending patches,
> > but not yours. Presumably building from source without your patches
> > should give similar effect (IIRC the patches I applied related
> > to MC routing)
> >  
> > > Can I access the logs from the CI run?  
> >
> > Yes
> >
> > https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2025-07-19--00-00 
> >  
> > > Is there a way I can debug in you CI environment?  
> >
> > Not at this point, unfortunately.
> >  
> > > Can I submit debug patches?  
> >
> > https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style   
> 
> I am able to run my tests in this environment, but sadly I still cant reproduce the failure.
> Can you tell me more about the environment you are using for CI?  What version of GCC is used?
> What distro and release is the environment build from?

Not sure the compiler and distro matters here:

the bond options tests prints a bunch of:

# RTNETLINK answers: Message too long
# Cannot send link get request: Message too long
# RTNETLINK answers: Message too long
# Cannot send link get request: Message too long
# Not enough information: "dev" argument is required.
# RTNETLINK answers: Message too long

> I have made some changes to the function that is failing In an attempt to fix the problem.
> If the problem continues with my next version would it be possible to save the build artifacts
> used in the test (vmlinux)?

Right, let's see if the problem persists. I updated iproute2 recently
too, so maybe that will help.

Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[Simon Horman]

On Fri, Jul 18, 2025 at 02:23:43PM -0700, David Wilder wrote:
> This selftest provided a functional test for the arp_ip_target parameter
> both with and without user supplied vlan tags.
> 
> and
> 
> Updates to the bonding documentation.
> 
> Signed-off-by: David Wilder <wilder@us.ibm.com>
> ---
>  Documentation/networking/bonding.rst          |  11 ++
>  .../selftests/drivers/net/bonding/Makefile    |   3 +-
>  .../drivers/net/bonding/bond-arp-ip-target.sh | 178 ++++++++++++++++++

Hi David,

Recently we have started running shellcheck as part of our CI for Networking.

Excluding SC2317, which flagges code as unreachable due to
the structure of many sleftests, including this one, I think it is trivial
to make bond-arp-ip-target.sh selftest-clean.

As I see there will be a v7 anyway, could you take a look at doing so?

  $ shellcheck -e SC2317 ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
  
  In ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh line 133:
                  if [ $RET -ne 0 ]; then
                       ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.
  
  Did you mean: 
                  if [ "$RET" -ne 0 ]; then
  
  
  In ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh line 160:
                  if [ $RET -ne 0 ]; then
                       ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.
  
  Did you mean: 
                  if [ "$RET" -ne 0 ]; then
  
  For more information:
    https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  

And sorry for not flagging this earlier.
For some reason it seemed less clear to me the last time I checked.

RE: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

[David Wilder]

________________________________________
From: Simon Horman <horms@kernel.org>
Sent: Sunday, July 20, 2025 3:37 AM
To: David Wilder
Cc: netdev@vger.kernel.org; jv@jvosburgh.net; pradeeps@linux.vnet.ibm.com; Pradeep Satyanarayana; i.maximets@ovn.org; Adrian Moreno Zapata; Hangbin Liu; stephen@networkplumber.org
Subject: [EXTERNAL] Re: [PATCH net-next v6 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.

>On Fri, Jul 18, 2025 at 02:23:43PM -0700, David Wilder wrote:
>> This selftest provided a functional test for the arp_ip_target parameter
>> both with and without user supplied vlan tags.
>>
>> and
>>
>> Updates to the bonding documentation.
>>
>> Signed-off-by: David Wilder <wilder@us.ibm.com>
>> ---
>>  Documentation/networking/bonding.rst          |  11 ++
>>  .../selftests/drivers/net/bonding/Makefile    |   3 +-
>>  .../drivers/net/bonding/bond-arp-ip-target.sh | 178 ++++++++++++++++++
>
>Hi David,
>
>Recently we have started running shellcheck as part of our CI for Networking.
>
>Excluding SC2317, which flagges code as unreachable due to
>the structure of many sleftests, including this one, I think it is trivial
>to make bond-arp-ip-target.sh selftest-clean.
>
>As I see there will be a v7 anyway, could you take a look at doing so?
>
>  $ shellcheck -e SC2317 ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
>
>  In ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh line 133:
>                  if [ $RET -ne 0 ]; then
>                       ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.
>
>  Did you mean:
>                  if [ "$RET" -ne 0 ]; then
>
>
>  In ./tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh line 160:
>                  if [ $RET -ne 0 ]; then
>                       ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.
>
>  Did you mean:
>                  if [ "$RET" -ne 0 ]; then
>
>  For more information:
>    https://www.shellcheck.net/wiki/SC2086   -- Double quote to prevent globbing ...
>
>
>And sorry for not flagging this earlier.
>For some reason it seemed less clear to me the last time I checked.

Hi Simon
Thanks for flagging the shellcheck errors.  I apparently had
installed old version of shellcheck that was not flagging SC2317
or the un-quoted $RET.  After upgrading to V0.10.0. I see them now.
I fixed the $RET issue and added # shellcheck disable=SC2317.
Runs clean now.  I will update the test script for V7.