bonding: add retransmit membership reports tunable

Allow sysadmins to configure the number of multicast
membership report sent on a link failure event.

Signed-off-by: Flavio Leitner <fleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index d2b62b7..5dc6387 100644 (file)
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -765,6 +765,14 @@ xmit_hash_policy
        does not exist, and the layer2 policy is the only policy.  The
        layer2+3 value was added for bonding version 3.2.2.
 
+resend_igmp
+
+       Specifies the number of IGMP membership reports to be issued after
+       a failover event. One membership report is issued immediately after
+       the failover, subsequent packets are sent in each 200ms interval.
+
+       The valid range is 0 - 255; the default value is 1. This option
+       was added for bonding version 3.7.0.
 
 3. Configuring Bonding Devices
 ==============================

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ad63866..6f5e6b4 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -109,6 +109,7 @@ static char *arp_validate;
 static char *fail_over_mac;
 static int all_slaves_active = 0;
 static struct bond_params bonding_defaults;
+static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 
 module_param(max_bonds, int, 0);
 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
@@ -163,6 +164,8 @@ module_param(all_slaves_active, int, 0);
 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
                                     "by setting active flag for all slaves.  "
                                     "0 for never (default), 1 for always.");
+module_param(resend_igmp, int, 0);
+MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
 
 /*----------------------------- Global variables ----------------------------*/
 
@@ -905,6 +908,9 @@ static void bond_resend_igmp_join_requests(struct bonding *bond)
                }
        }
 
+       if (--bond->igmp_retrans > 0)
+               queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
+
        read_unlock(&bond->lock);
 }
 
@@ -1213,6 +1219,7 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
         * all were sent on curr_active_slave */
        if ((USES_PRIMARY(bond->params.mode) && new_active) ||
            bond->params.mode == BOND_MODE_ROUNDROBIN) {
+               bond->igmp_retrans = bond->params.resend_igmp;
                queue_delayed_work(bond->wq, &bond->mcast_work, 0);
        }
 }
@@ -4933,6 +4940,13 @@ static int bond_check_params(struct bond_params *params)
                all_slaves_active = 0;
        }
 
+       if (resend_igmp < 0 || resend_igmp > 255) {
+               pr_warning("Warning: resend_igmp (%d) should be between "
+                          "0 and 255, resetting to %d\n",
+                          resend_igmp, BOND_DEFAULT_RESEND_IGMP);
+               resend_igmp = BOND_DEFAULT_RESEND_IGMP;
+       }
+
        /* reset values for TLB/ALB */
        if ((bond_mode == BOND_MODE_TLB) ||
            (bond_mode == BOND_MODE_ALB)) {
@@ -5105,6 +5119,7 @@ static int bond_check_params(struct bond_params *params)
        params->fail_over_mac = fail_over_mac_value;
        params->tx_queues = tx_queues;
        params->all_slaves_active = all_slaves_active;
+       params->resend_igmp = resend_igmp;
 
        if (primary) {
                strncpy(params->primary, primary, IFNAMSIZ);

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index c311aed..01b4c3f 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1592,6 +1592,49 @@ out:
 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
                   bonding_show_slaves_active, bonding_store_slaves_active);
 
+/*
+ * Show and set the number of IGMP membership reports to send on link failure
+ */
+static ssize_t bonding_show_resend_igmp(struct device *d,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+       struct bonding *bond = to_bond(d);
+
+       return sprintf(buf, "%d\n", bond->params.resend_igmp);
+}
+
+static ssize_t bonding_store_resend_igmp(struct device *d,
+                                         struct device_attribute *attr,
+                                         const char *buf, size_t count)
+{
+       int new_value, ret = count;
+       struct bonding *bond = to_bond(d);
+
+       if (sscanf(buf, "%d", &new_value) != 1) {
+               pr_err("%s: no resend_igmp value specified.\n",
+                      bond->dev->name);
+               ret = -EINVAL;
+               goto out;
+       }
+
+       if (new_value < 0) {
+               pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
+                      bond->dev->name, new_value);
+               ret = -EINVAL;
+               goto out;
+       }
+
+       pr_info("%s: Setting resend_igmp to %d.\n",
+               bond->dev->name, new_value);
+       bond->params.resend_igmp = new_value;
+out:
+       return ret;
+}
+
+static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
+                  bonding_show_resend_igmp, bonding_store_resend_igmp);
+
 static struct attribute *per_bond_attrs[] = {
        &dev_attr_slaves.attr,
        &dev_attr_mode.attr,
@@ -1619,6 +1662,7 @@ static struct attribute *per_bond_attrs[] = {
        &dev_attr_ad_partner_mac.attr,
        &dev_attr_queue_id.attr,
        &dev_attr_all_slaves_active.attr,
+       &dev_attr_resend_igmp.attr,
        NULL,
 };
 

diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 308ed10..c15f213 100644 (file)
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -136,6 +136,7 @@ struct bond_params {
        __be32 arp_targets[BOND_MAX_ARP_TARGETS];
        int tx_queues;
        int all_slaves_active;
+       int resend_igmp;
 };
 
 struct bond_parm_tbl {
@@ -202,6 +203,7 @@ struct bonding {
        s8       send_grat_arp;
        s8       send_unsol_na;
        s8       setup_by_slave;
+       s8       igmp_retrans;
 #ifdef CONFIG_PROC_FS
        struct   proc_dir_entry *proc_entry;
        char     proc_file_name[IFNAMSIZ];

diff --git a/include/linux/if_bonding.h b/include/linux/if_bonding.h
index 2c79943..a17edda 100644 (file)
--- a/include/linux/if_bonding.h
+++ b/include/linux/if_bonding.h
@@ -84,6 +84,9 @@
 #define BOND_DEFAULT_MAX_BONDS  1   /* Default maximum number of devices to support */
 
 #define BOND_DEFAULT_TX_QUEUES 16   /* Default number of tx queues per device */
+
+#define BOND_DEFAULT_RESEND_IGMP       1 /* Default number of IGMP membership reports */
+
 /* hashing types */
 #define BOND_XMIT_POLICY_LAYER2                0 /* layer 2 (MAC only), default */
 #define BOND_XMIT_POLICY_LAYER34       1 /* layer 3+4 (IP ^ (TCP || UDP)) */