const struct dp_upcall_info *,
uint32_t cutlen);
+static void ovs_dp_masks_rebalance(struct work_struct *work);
+
/* Must be called with rcu_read_lock or ovs_mutex. */
const char *ovs_dp_name(const struct datapath *dp)
{
goto err_destroy_reply;
ovs_dp_set_net(dp, sock_net(skb->sk));
+ INIT_DELAYED_WORK(&dp->masks_rebalance, ovs_dp_masks_rebalance);
/* Allocate table. */
err = ovs_flow_tbl_init(&dp->table);
ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
+ schedule_delayed_work(&dp->masks_rebalance,
+ msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
+
ovs_unlock();
ovs_notify(&dp_datapath_genl_family, reply, info);
/* RCU destroy the flow table */
call_rcu(&dp->rcu, destroy_dp_rcu);
+
+ /* Cancel remaining work. */
+ cancel_delayed_work_sync(&dp->masks_rebalance);
}
static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
return skb->len;
}
+static void ovs_dp_masks_rebalance(struct work_struct *work)
+{
+ struct datapath *dp = container_of(work, struct datapath,
+ masks_rebalance.work);
+
+ ovs_lock();
+ ovs_flow_masks_rebalance(&dp->table);
+ ovs_unlock();
+
+ schedule_delayed_work(&dp->masks_rebalance,
+ msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
+}
+
static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/rculist.h>
+#include <linux/sort.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
return ti;
}
+static void __mask_array_destroy(struct mask_array *ma)
+{
+ free_percpu(ma->masks_usage_cntr);
+ kfree(ma);
+}
+
+static void mask_array_rcu_cb(struct rcu_head *rcu)
+{
+ struct mask_array *ma = container_of(rcu, struct mask_array, rcu);
+
+ __mask_array_destroy(ma);
+}
+
+static void tbl_mask_array_reset_counters(struct mask_array *ma)
+{
+ int i, cpu;
+
+ /* As the per CPU counters are not atomic we can not go ahead and
+ * reset them from another CPU. To be able to still have an approximate
+ * zero based counter we store the value at reset, and subtract it
+ * later when processing.
+ */
+ for (i = 0; i < ma->max; i++) {
+ ma->masks_usage_zero_cntr[i] = 0;
+
+ for_each_possible_cpu(cpu) {
+ u64 *usage_counters = per_cpu_ptr(ma->masks_usage_cntr,
+ cpu);
+ unsigned int start;
+ u64 counter;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&ma->syncp);
+ counter = usage_counters[i];
+ } while (u64_stats_fetch_retry_irq(&ma->syncp, start));
+
+ ma->masks_usage_zero_cntr[i] += counter;
+ }
+ }
+}
+
static struct mask_array *tbl_mask_array_alloc(int size)
{
struct mask_array *new;
size = max(MASK_ARRAY_SIZE_MIN, size);
new = kzalloc(sizeof(struct mask_array) +
- sizeof(struct sw_flow_mask *) * size, GFP_KERNEL);
+ sizeof(struct sw_flow_mask *) * size +
+ sizeof(u64) * size, GFP_KERNEL);
if (!new)
return NULL;
+ new->masks_usage_zero_cntr = (u64 *)((u8 *)new +
+ sizeof(struct mask_array) +
+ sizeof(struct sw_flow_mask *) *
+ size);
+
+ new->masks_usage_cntr = __alloc_percpu(sizeof(u64) * size,
+ __alignof__(u64));
+ if (!new->masks_usage_cntr) {
+ kfree(new);
+ return NULL;
+ }
+
new->count = 0;
new->max = size;
if (ovsl_dereference(old->masks[i]))
new->masks[new->count++] = old->masks[i];
}
+ call_rcu(&old->rcu, mask_array_rcu_cb);
}
rcu_assign_pointer(tbl->mask_array, new);
- kfree_rcu(old, rcu);
return 0;
}
return err;
ma = ovsl_dereference(tbl->mask_array);
+ } else {
+ /* On every add or delete we need to reset the counters so
+ * every new mask gets a fair chance of being prioritized.
+ */
+ tbl_mask_array_reset_counters(ma);
}
BUG_ON(ovsl_dereference(ma->masks[ma_count]));
if (ma->max >= (MASK_ARRAY_SIZE_MIN * 2) &&
ma_count <= (ma->max / 3))
tbl_mask_array_realloc(tbl, ma->max / 2);
+ else
+ tbl_mask_array_reset_counters(ma);
+
}
/* Remove 'mask' from the mask list, if it is not needed any more. */
free_ti:
__table_instance_destroy(ti);
free_mask_array:
- kfree(ma);
+ __mask_array_destroy(ma);
free_mask_cache:
free_percpu(table->mask_cache);
return -ENOMEM;
struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
free_percpu(table->mask_cache);
- kfree_rcu(rcu_dereference_raw(table->mask_array), rcu);
+ call_rcu(&table->mask_array->rcu, mask_array_rcu_cb);
table_instance_destroy(table, ti, ufid_ti, false);
}
u32 *n_mask_hit,
u32 *index)
{
+ u64 *usage_counters = this_cpu_ptr(ma->masks_usage_cntr);
struct sw_flow *flow;
struct sw_flow_mask *mask;
int i;
mask = rcu_dereference_ovsl(ma->masks[*index]);
if (mask) {
flow = masked_flow_lookup(ti, key, mask, n_mask_hit);
- if (flow)
+ if (flow) {
+ u64_stats_update_begin(&ma->syncp);
+ usage_counters[*index]++;
+ u64_stats_update_end(&ma->syncp);
return flow;
+ }
}
}
flow = masked_flow_lookup(ti, key, mask, n_mask_hit);
if (flow) { /* Found */
*index = i;
+ u64_stats_update_begin(&ma->syncp);
+ usage_counters[*index]++;
+ u64_stats_update_end(&ma->syncp);
return flow;
}
}
return 0;
}
+static int compare_mask_and_count(const void *a, const void *b)
+{
+ const struct mask_count *mc_a = a;
+ const struct mask_count *mc_b = b;
+
+ return (s64)mc_b->counter - (s64)mc_a->counter;
+}
+
+/* Must be called with OVS mutex held. */
+void ovs_flow_masks_rebalance(struct flow_table *table)
+{
+ struct mask_array *ma = rcu_dereference_ovsl(table->mask_array);
+ struct mask_count *masks_and_count;
+ struct mask_array *new;
+ int masks_entries = 0;
+ int i;
+
+ /* Build array of all current entries with use counters. */
+ masks_and_count = kmalloc_array(ma->max, sizeof(*masks_and_count),
+ GFP_KERNEL);
+ if (!masks_and_count)
+ return;
+
+ for (i = 0; i < ma->max; i++) {
+ struct sw_flow_mask *mask;
+ unsigned int start;
+ int cpu;
+
+ mask = rcu_dereference_ovsl(ma->masks[i]);
+ if (unlikely(!mask))
+ break;
+
+ masks_and_count[i].index = i;
+ masks_and_count[i].counter = 0;
+
+ for_each_possible_cpu(cpu) {
+ u64 *usage_counters = per_cpu_ptr(ma->masks_usage_cntr,
+ cpu);
+ u64 counter;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&ma->syncp);
+ counter = usage_counters[i];
+ } while (u64_stats_fetch_retry_irq(&ma->syncp, start));
+
+ masks_and_count[i].counter += counter;
+ }
+
+ /* Subtract the zero count value. */
+ masks_and_count[i].counter -= ma->masks_usage_zero_cntr[i];
+
+ /* Rather than calling tbl_mask_array_reset_counters()
+ * below when no change is needed, do it inline here.
+ */
+ ma->masks_usage_zero_cntr[i] += masks_and_count[i].counter;
+ }
+
+ if (i == 0)
+ goto free_mask_entries;
+
+ /* Sort the entries */
+ masks_entries = i;
+ sort(masks_and_count, masks_entries, sizeof(*masks_and_count),
+ compare_mask_and_count, NULL);
+
+ /* If the order is the same, nothing to do... */
+ for (i = 0; i < masks_entries; i++) {
+ if (i != masks_and_count[i].index)
+ break;
+ }
+ if (i == masks_entries)
+ goto free_mask_entries;
+
+ /* Rebuilt the new list in order of usage. */
+ new = tbl_mask_array_alloc(ma->max);
+ if (!new)
+ goto free_mask_entries;
+
+ for (i = 0; i < masks_entries; i++) {
+ int index = masks_and_count[i].index;
+
+ new->masks[new->count++] =
+ rcu_dereference_ovsl(ma->masks[index]);
+ }
+
+ rcu_assign_pointer(table->mask_array, new);
+ call_rcu(&ma->rcu, mask_array_rcu_cb);
+
+free_mask_entries:
+ kfree(masks_and_count);
+}
+
/* Initializes the flow module.
* Returns zero if successful or a negative error code. */
int ovs_flow_init(void)
projects / platform / kernel / linux-starfive.git / commitdiff