[net-next 0/2] bonding: netlink errors and cleanup

[net-next 0/2] bonding: netlink errors and cleanup

[Jonathan Toppins]

The first patch attempts to set helpful error messages when
configuring bonds via netlink. The second patch removes redundant
init code for RLB mode which is already done in bond_open.

Jonathan Toppins (2):
  bonding: netlink error message support for options
  bonding: cleanup bond_create

 drivers/net/bonding/bond_main.c    |  24 ++-----
 drivers/net/bonding/bond_netlink.c | 101 +++++++++++++++++++----------
 drivers/net/bonding/bond_options.c |  29 +++++++--
 include/net/bond_options.h         |   3 +-
 4 files changed, 98 insertions(+), 59 deletions(-)

-- 
2.27.0

[net-next 1/2] bonding: netlink error message support for options

[Jonathan Toppins]

Add support for reporting errors via extack in both bond_newlink
and bond_changelink.

Instead of having to look in the kernel log for why an option was not
correct just report the error to the user via the extack variable.

What is currently reported today:
  ip link add bond0 type bond
  ip link set bond0 up
  ip link set bond0 type bond mode 4
 RTNETLINK answers: Device or resource busy

After this change:
  ip link add bond0 type bond
  ip link set bond0 up
  ip link set bond0 type bond mode 4
 Error: unable to set option because the bond is up.

Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
---

Notes:
    Removed the printf support and just added static messages for various
    error events.

 drivers/net/bonding/bond_netlink.c | 101 +++++++++++++++++++----------
 drivers/net/bonding/bond_options.c |  29 +++++++--
 include/net/bond_options.h         |   3 +-
 3 files changed, 92 insertions(+), 41 deletions(-)

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 6f404f9c34e3..5a6f44455b95 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -151,7 +151,8 @@ static int bond_slave_changelink(struct net_device *bond_dev,
 		snprintf(queue_id_str, sizeof(queue_id_str), "%s:%u\n",
 			 slave_dev->name, queue_id);
 		bond_opt_initstr(&newval, queue_id_str);
-		err = __bond_opt_set(bond, BOND_OPT_QUEUE_ID, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_QUEUE_ID, &newval,
+				     data[IFLA_BOND_SLAVE_QUEUE_ID], extack);
 		if (err)
 			return err;
 	}
@@ -175,7 +176,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int mode = nla_get_u8(data[IFLA_BOND_MODE]);
 
 		bond_opt_initval(&newval, mode);
-		err = __bond_opt_set(bond, BOND_OPT_MODE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_MODE, &newval,
+				     data[IFLA_BOND_MODE], extack);
 		if (err)
 			return err;
 	}
@@ -192,7 +194,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			active_slave = slave_dev->name;
 		}
 		bond_opt_initstr(&newval, active_slave);
-		err = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval,
+				     data[IFLA_BOND_ACTIVE_SLAVE], extack);
 		if (err)
 			return err;
 	}
@@ -200,7 +203,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		miimon = nla_get_u32(data[IFLA_BOND_MIIMON]);
 
 		bond_opt_initval(&newval, miimon);
-		err = __bond_opt_set(bond, BOND_OPT_MIIMON, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_MIIMON, &newval,
+				     data[IFLA_BOND_MIIMON], extack);
 		if (err)
 			return err;
 	}
@@ -208,7 +212,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int updelay = nla_get_u32(data[IFLA_BOND_UPDELAY]);
 
 		bond_opt_initval(&newval, updelay);
-		err = __bond_opt_set(bond, BOND_OPT_UPDELAY, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_UPDELAY, &newval,
+				     data[IFLA_BOND_UPDELAY], extack);
 		if (err)
 			return err;
 	}
@@ -216,7 +221,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int downdelay = nla_get_u32(data[IFLA_BOND_DOWNDELAY]);
 
 		bond_opt_initval(&newval, downdelay);
-		err = __bond_opt_set(bond, BOND_OPT_DOWNDELAY, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_DOWNDELAY, &newval,
+				     data[IFLA_BOND_DOWNDELAY], extack);
 		if (err)
 			return err;
 	}
@@ -224,7 +230,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int delay = nla_get_u32(data[IFLA_BOND_PEER_NOTIF_DELAY]);
 
 		bond_opt_initval(&newval, delay);
-		err = __bond_opt_set(bond, BOND_OPT_PEER_NOTIF_DELAY, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_PEER_NOTIF_DELAY, &newval,
+				     data[IFLA_BOND_PEER_NOTIF_DELAY], extack);
 		if (err)
 			return err;
 	}
@@ -232,7 +239,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int use_carrier = nla_get_u8(data[IFLA_BOND_USE_CARRIER]);
 
 		bond_opt_initval(&newval, use_carrier);
-		err = __bond_opt_set(bond, BOND_OPT_USE_CARRIER, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_USE_CARRIER, &newval,
+				     data[IFLA_BOND_USE_CARRIER], extack);
 		if (err)
 			return err;
 	}
@@ -240,12 +248,14 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int arp_interval = nla_get_u32(data[IFLA_BOND_ARP_INTERVAL]);
 
 		if (arp_interval && miimon) {
-			netdev_err(bond->dev, "ARP monitoring cannot be used with MII monitoring\n");
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_BOND_ARP_INTERVAL],
+					    "ARP monitoring cannot be used with MII monitoring");
 			return -EINVAL;
 		}
 
 		bond_opt_initval(&newval, arp_interval);
-		err = __bond_opt_set(bond, BOND_OPT_ARP_INTERVAL, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_ARP_INTERVAL, &newval,
+				     data[IFLA_BOND_ARP_INTERVAL], extack);
 		if (err)
 			return err;
 	}
@@ -264,7 +274,9 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 
 			bond_opt_initval(&newval, (__force u64)target);
 			err = __bond_opt_set(bond, BOND_OPT_ARP_TARGETS,
-					     &newval);
+					     &newval,
+					     data[IFLA_BOND_ARP_IP_TARGET],
+					     extack);
 			if (err)
 				break;
 			i++;
@@ -292,7 +304,9 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 
 			bond_opt_initextra(&newval, &addr6, sizeof(addr6));
 			err = __bond_opt_set(bond, BOND_OPT_NS_TARGETS,
-					     &newval);
+					     &newval,
+					     data[IFLA_BOND_NS_IP6_TARGET],
+					     extack);
 			if (err)
 				break;
 			i++;
@@ -307,12 +321,14 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int arp_validate = nla_get_u32(data[IFLA_BOND_ARP_VALIDATE]);
 
 		if (arp_validate && miimon) {
-			netdev_err(bond->dev, "ARP validating cannot be used with MII monitoring\n");
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_BOND_ARP_INTERVAL],
+					    "ARP validating cannot be used with MII monitoring");
 			return -EINVAL;
 		}
 
 		bond_opt_initval(&newval, arp_validate);
-		err = __bond_opt_set(bond, BOND_OPT_ARP_VALIDATE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_ARP_VALIDATE, &newval,
+				     data[IFLA_BOND_ARP_VALIDATE], extack);
 		if (err)
 			return err;
 	}
@@ -321,7 +337,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u32(data[IFLA_BOND_ARP_ALL_TARGETS]);
 
 		bond_opt_initval(&newval, arp_all_targets);
-		err = __bond_opt_set(bond, BOND_OPT_ARP_ALL_TARGETS, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_ARP_ALL_TARGETS, &newval,
+				     data[IFLA_BOND_ARP_ALL_TARGETS], extack);
 		if (err)
 			return err;
 	}
@@ -335,7 +352,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			primary = dev->name;
 
 		bond_opt_initstr(&newval, primary);
-		err = __bond_opt_set(bond, BOND_OPT_PRIMARY, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_PRIMARY, &newval,
+				     data[IFLA_BOND_PRIMARY], extack);
 		if (err)
 			return err;
 	}
@@ -344,7 +362,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_PRIMARY_RESELECT]);
 
 		bond_opt_initval(&newval, primary_reselect);
-		err = __bond_opt_set(bond, BOND_OPT_PRIMARY_RESELECT, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_PRIMARY_RESELECT, &newval,
+				     data[IFLA_BOND_PRIMARY_RESELECT], extack);
 		if (err)
 			return err;
 	}
@@ -353,7 +372,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_FAIL_OVER_MAC]);
 
 		bond_opt_initval(&newval, fail_over_mac);
-		err = __bond_opt_set(bond, BOND_OPT_FAIL_OVER_MAC, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_FAIL_OVER_MAC, &newval,
+				     data[IFLA_BOND_FAIL_OVER_MAC], extack);
 		if (err)
 			return err;
 	}
@@ -362,7 +382,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_XMIT_HASH_POLICY]);
 
 		bond_opt_initval(&newval, xmit_hash_policy);
-		err = __bond_opt_set(bond, BOND_OPT_XMIT_HASH, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_XMIT_HASH, &newval,
+				     data[IFLA_BOND_XMIT_HASH_POLICY], extack);
 		if (err)
 			return err;
 	}
@@ -371,7 +392,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u32(data[IFLA_BOND_RESEND_IGMP]);
 
 		bond_opt_initval(&newval, resend_igmp);
-		err = __bond_opt_set(bond, BOND_OPT_RESEND_IGMP, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_RESEND_IGMP, &newval,
+				     data[IFLA_BOND_RESEND_IGMP], extack);
 		if (err)
 			return err;
 	}
@@ -380,7 +402,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_NUM_PEER_NOTIF]);
 
 		bond_opt_initval(&newval, num_peer_notif);
-		err = __bond_opt_set(bond, BOND_OPT_NUM_PEER_NOTIF, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_NUM_PEER_NOTIF, &newval,
+				     data[IFLA_BOND_NUM_PEER_NOTIF], extack);
 		if (err)
 			return err;
 	}
@@ -389,7 +412,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_ALL_SLAVES_ACTIVE]);
 
 		bond_opt_initval(&newval, all_slaves_active);
-		err = __bond_opt_set(bond, BOND_OPT_ALL_SLAVES_ACTIVE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_ALL_SLAVES_ACTIVE, &newval,
+				     data[IFLA_BOND_ALL_SLAVES_ACTIVE], extack);
 		if (err)
 			return err;
 	}
@@ -398,7 +422,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u32(data[IFLA_BOND_MIN_LINKS]);
 
 		bond_opt_initval(&newval, min_links);
-		err = __bond_opt_set(bond, BOND_OPT_MINLINKS, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_MINLINKS, &newval,
+				     data[IFLA_BOND_MIN_LINKS], extack);
 		if (err)
 			return err;
 	}
@@ -407,7 +432,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u32(data[IFLA_BOND_LP_INTERVAL]);
 
 		bond_opt_initval(&newval, lp_interval);
-		err = __bond_opt_set(bond, BOND_OPT_LP_INTERVAL, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_LP_INTERVAL, &newval,
+				     data[IFLA_BOND_LP_INTERVAL], extack);
 		if (err)
 			return err;
 	}
@@ -416,7 +442,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u32(data[IFLA_BOND_PACKETS_PER_SLAVE]);
 
 		bond_opt_initval(&newval, packets_per_slave);
-		err = __bond_opt_set(bond, BOND_OPT_PACKETS_PER_SLAVE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_PACKETS_PER_SLAVE, &newval,
+				     data[IFLA_BOND_PACKETS_PER_SLAVE], extack);
 		if (err)
 			return err;
 	}
@@ -425,7 +452,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int lacp_active = nla_get_u8(data[IFLA_BOND_AD_LACP_ACTIVE]);
 
 		bond_opt_initval(&newval, lacp_active);
-		err = __bond_opt_set(bond, BOND_OPT_LACP_ACTIVE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_LACP_ACTIVE, &newval,
+				     data[IFLA_BOND_AD_LACP_ACTIVE], extack);
 		if (err)
 			return err;
 	}
@@ -435,7 +463,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_AD_LACP_RATE]);
 
 		bond_opt_initval(&newval, lacp_rate);
-		err = __bond_opt_set(bond, BOND_OPT_LACP_RATE, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_LACP_RATE, &newval,
+				     data[IFLA_BOND_AD_LACP_RATE], extack);
 		if (err)
 			return err;
 	}
@@ -444,7 +473,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u8(data[IFLA_BOND_AD_SELECT]);
 
 		bond_opt_initval(&newval, ad_select);
-		err = __bond_opt_set(bond, BOND_OPT_AD_SELECT, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_AD_SELECT, &newval,
+				     data[IFLA_BOND_AD_SELECT], extack);
 		if (err)
 			return err;
 	}
@@ -453,7 +483,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u16(data[IFLA_BOND_AD_ACTOR_SYS_PRIO]);
 
 		bond_opt_initval(&newval, actor_sys_prio);
-		err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYS_PRIO, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYS_PRIO, &newval,
+				     data[IFLA_BOND_AD_ACTOR_SYS_PRIO], extack);
 		if (err)
 			return err;
 	}
@@ -462,7 +493,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 			nla_get_u16(data[IFLA_BOND_AD_USER_PORT_KEY]);
 
 		bond_opt_initval(&newval, port_key);
-		err = __bond_opt_set(bond, BOND_OPT_AD_USER_PORT_KEY, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_AD_USER_PORT_KEY, &newval,
+				     data[IFLA_BOND_AD_USER_PORT_KEY], extack);
 		if (err)
 			return err;
 	}
@@ -472,7 +504,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 
 		bond_opt_initval(&newval,
 				 nla_get_u64(data[IFLA_BOND_AD_ACTOR_SYSTEM]));
-		err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYSTEM, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYSTEM, &newval,
+				     data[IFLA_BOND_AD_ACTOR_SYSTEM], extack);
 		if (err)
 			return err;
 	}
@@ -480,7 +513,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int dynamic_lb = nla_get_u8(data[IFLA_BOND_TLB_DYNAMIC_LB]);
 
 		bond_opt_initval(&newval, dynamic_lb);
-		err = __bond_opt_set(bond, BOND_OPT_TLB_DYNAMIC_LB, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_TLB_DYNAMIC_LB, &newval,
+				     data[IFLA_BOND_TLB_DYNAMIC_LB], extack);
 		if (err)
 			return err;
 	}
@@ -489,7 +523,8 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
 		int missed_max = nla_get_u8(data[IFLA_BOND_MISSED_MAX]);
 
 		bond_opt_initval(&newval, missed_max);
-		err = __bond_opt_set(bond, BOND_OPT_MISSED_MAX, &newval);
+		err = __bond_opt_set(bond, BOND_OPT_MISSED_MAX, &newval,
+				     data[IFLA_BOND_MISSED_MAX], extack);
 		if (err)
 			return err;
 	}
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index 1f8323ad5282..5de5f6674f0e 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -632,27 +632,35 @@ static int bond_opt_check_deps(struct bonding *bond,
 }
 
 static void bond_opt_dep_print(struct bonding *bond,
-			       const struct bond_option *opt)
+			       const struct bond_option *opt,
+			       struct nlattr *bad_attr,
+			       struct netlink_ext_ack *extack)
 {
 	const struct bond_opt_value *modeval;
 	struct bond_params *params;
 
 	params = &bond->params;
 	modeval = bond_opt_get_val(BOND_OPT_MODE, params->mode);
-	if (test_bit(params->mode, &opt->unsuppmodes))
+	if (test_bit(params->mode, &opt->unsuppmodes)) {
 		netdev_err(bond->dev, "option %s: mode dependency failed, not supported in mode %s(%llu)\n",
 			   opt->name, modeval->string, modeval->value);
+		NL_SET_ERR_MSG_ATTR(extack, bad_attr,
+				    "option not supported in mode");
+	}
 }
 
 static void bond_opt_error_interpret(struct bonding *bond,
 				     const struct bond_option *opt,
-				     int error, const struct bond_opt_value *val)
+				     int error, const struct bond_opt_value *val,
+				     struct nlattr *bad_attr,
+				     struct netlink_ext_ack *extack)
 {
 	const struct bond_opt_value *minval, *maxval;
 	char *p;
 
 	switch (error) {
 	case -EINVAL:
+		NL_SET_ERR_MSG_ATTR(extack, bad_attr, "invalid option value");
 		if (val) {
 			if (val->string) {
 				/* sometimes RAWVAL opts may have new lines */
@@ -674,13 +682,17 @@ static void bond_opt_error_interpret(struct bonding *bond,
 			   opt->name, minval ? minval->value : 0, maxval->value);
 		break;
 	case -EACCES:
-		bond_opt_dep_print(bond, opt);
+		bond_opt_dep_print(bond, opt, bad_attr, extack);
 		break;
 	case -ENOTEMPTY:
+		NL_SET_ERR_MSG_ATTR(extack, bad_attr,
+				    "unable to set option because the bond device has slaves");
 		netdev_err(bond->dev, "option %s: unable to set because the bond device has slaves\n",
 			   opt->name);
 		break;
 	case -EBUSY:
+		NL_SET_ERR_MSG_ATTR(extack, bad_attr,
+				    "unable to set option because the bond is up");
 		netdev_err(bond->dev, "option %s: unable to set because the bond device is up\n",
 			   opt->name);
 		break;
@@ -691,6 +703,8 @@ static void bond_opt_error_interpret(struct bonding *bond,
 				*p = '\0';
 			netdev_err(bond->dev, "option %s: interface %s does not exist!\n",
 				   opt->name, val->string);
+			NL_SET_ERR_MSG_ATTR(extack, bad_attr,
+					    "interface does not exist");
 		}
 		break;
 	default:
@@ -709,7 +723,8 @@ static void bond_opt_error_interpret(struct bonding *bond,
  * must be obtained before calling this function.
  */
 int __bond_opt_set(struct bonding *bond,
-		   unsigned int option, struct bond_opt_value *val)
+		   unsigned int option, struct bond_opt_value *val,
+		   struct nlattr *bad_attr, struct netlink_ext_ack *extack)
 {
 	const struct bond_opt_value *retval = NULL;
 	const struct bond_option *opt;
@@ -731,7 +746,7 @@ int __bond_opt_set(struct bonding *bond,
 	ret = opt->set(bond, retval);
 out:
 	if (ret)
-		bond_opt_error_interpret(bond, opt, ret, val);
+		bond_opt_error_interpret(bond, opt, ret, val, bad_attr, extack);
 
 	return ret;
 }
@@ -753,7 +768,7 @@ int __bond_opt_set_notify(struct bonding *bond,
 
 	ASSERT_RTNL();
 
-	ret = __bond_opt_set(bond, option, val);
+	ret = __bond_opt_set(bond, option, val, NULL, NULL);
 
 	if (!ret && (bond->dev->reg_state == NETREG_REGISTERED))
 		call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index 61b49063791c..1618b76f4903 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -107,7 +107,8 @@ struct bond_option {
 };
 
 int __bond_opt_set(struct bonding *bond, unsigned int option,
-		   struct bond_opt_value *val);
+		   struct bond_opt_value *val,
+		   struct nlattr *bad_attr, struct netlink_ext_ack *extack);
 int __bond_opt_set_notify(struct bonding *bond, unsigned int option,
 			  struct bond_opt_value *val);
 int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf);
-- 
2.27.0

Re: [net-next 1/2] bonding: netlink error message support for options

[Jakub Kicinski]

On Mon,  6 Jun 2022 11:26:52 -0400 Jonathan Toppins wrote:
> Add support for reporting errors via extack in both bond_newlink
> and bond_changelink.
> 
> Instead of having to look in the kernel log for why an option was not
> correct just report the error to the user via the extack variable.
> 
> What is currently reported today:
>   ip link add bond0 type bond
>   ip link set bond0 up
>   ip link set bond0 type bond mode 4
>  RTNETLINK answers: Device or resource busy
> 
> After this change:
>   ip link add bond0 type bond
>   ip link set bond0 up
>   ip link set bond0 type bond mode 4
>  Error: unable to set option because the bond is up.
> 
> Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
> ---
> 
> Notes:
>     Removed the printf support and just added static messages for various
>     error events.

Thanks! nit, missing kdoc:

drivers/net/bonding/bond_options.c:729: warning: Function parameter or member 'bad_attr' not described in '__bond_opt_set'
drivers/net/bonding/bond_options.c:729: warning: Function parameter or member 'extack' not described in '__bond_opt_set'

Re: [net-next 1/2] bonding: netlink error message support for options

[Jonathan Toppins]

On 6/7/22 20:19, Jakub Kicinski wrote:
> On Mon,  6 Jun 2022 11:26:52 -0400 Jonathan Toppins wrote:
>> Add support for reporting errors via extack in both bond_newlink
>> and bond_changelink.
>>
>> Instead of having to look in the kernel log for why an option was not
>> correct just report the error to the user via the extack variable.
>>
>> What is currently reported today:
>>    ip link add bond0 type bond
>>    ip link set bond0 up
>>    ip link set bond0 type bond mode 4
>>   RTNETLINK answers: Device or resource busy
>>
>> After this change:
>>    ip link add bond0 type bond
>>    ip link set bond0 up
>>    ip link set bond0 type bond mode 4
>>   Error: unable to set option because the bond is up.
>>
>> Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
>> ---
>>
>> Notes:
>>      Removed the printf support and just added static messages for various
>>      error events.
> 
> Thanks! nit, missing kdoc:
> 
> drivers/net/bonding/bond_options.c:729: warning: Function parameter or member 'bad_attr' not described in '__bond_opt_set'
> drivers/net/bonding/bond_options.c:729: warning: Function parameter or member 'extack' not described in '__bond_opt_set'
> 

Thanks, will post a v2 tomorrow. What tool was used to generate the 
errors? sparse? checkpatch reported zero errors.

Re: [net-next 1/2] bonding: netlink error message support for options

[Eric Dumazet]

On Tue, Jun 7, 2022 at 5:23 PM Jonathan Toppins <jtoppins@redhat.com> wrote:

>
> Thanks, will post a v2 tomorrow. What tool was used to generate the
> errors? sparse? checkpatch reported zero errors.
>

make htmldocs

Re: [net-next 1/2] bonding: netlink error message support for options

[Jakub Kicinski]

On Tue, 7 Jun 2022 20:23:22 -0400 Jonathan Toppins wrote:
> Thanks, will post a v2 tomorrow. What tool was used to generate the 
> errors? sparse? checkpatch reported zero errors.

make W=1 ... builds will find them in sources but it's better to run
./scripts/kernel-doc explicitly to also catch problems in headers.
For example:

./scripts/kernel-doc -none $(git show --pretty="" --name-only HEAD)

[net-next 2/2] bonding: cleanup bond_create

[Jonathan Toppins]

Setting RLB_NULL_INDEX is not needed as this is done in bond_alb_initialize
which is called by bond_open.

Also reduce the number of rtnl_unlock calls by just using the standard
goto cleanup path.

Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
---
 drivers/net/bonding/bond_main.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f85372adf042..3d427183ec8e 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -6218,45 +6218,33 @@ int bond_create(struct net *net, const char *name)
 {
 	struct net_device *bond_dev;
 	struct bonding *bond;
-	struct alb_bond_info *bond_info;
-	int res;
+	int res = -ENOMEM;
 
 	rtnl_lock();
 
 	bond_dev = alloc_netdev_mq(sizeof(struct bonding),
 				   name ? name : "bond%d", NET_NAME_UNKNOWN,
 				   bond_setup, tx_queues);
-	if (!bond_dev) {
-		pr_err("%s: eek! can't alloc netdev!\n", name);
-		rtnl_unlock();
-		return -ENOMEM;
-	}
+	if (!bond_dev)
+		goto out;
 
-	/*
-	 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
-	 * It is set to 0 by default which is wrong.
-	 */
 	bond = netdev_priv(bond_dev);
-	bond_info = &(BOND_ALB_INFO(bond));
-	bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
-
 	dev_net_set(bond_dev, net);
 	bond_dev->rtnl_link_ops = &bond_link_ops;
 
 	res = register_netdevice(bond_dev);
 	if (res < 0) {
 		free_netdev(bond_dev);
-		rtnl_unlock();
-
-		return res;
+		goto out;
 	}
 
 	netif_carrier_off(bond_dev);
 
 	bond_work_init_all(bond);
 
+out:
 	rtnl_unlock();
-	return 0;
+	return res;
 }
 
 static int __net_init bond_net_init(struct net *net)
-- 
2.27.0