forked from luck/tmp_suning_uos_patched
net: openvswitch: convert mask list in mask array
Port the codes to linux upstream and with little changes.
Pravin B Shelar, says:
| mask caches index of mask in mask_list. On packet recv OVS
| need to traverse mask-list to get cached mask. Therefore array
| is better for retrieving cached mask. This also allows better
| cache replacement algorithm by directly checking mask's existence.
Link: d49fc3ff53
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tonghao Zhang
David S. Miller
parent
04b7d136d0
commit
4bc63b1b53
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@ -166,7 +166,6 @@ struct sw_flow_key_range {
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struct sw_flow_mask {
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int ref_count;
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struct rcu_head rcu;
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struct list_head list;
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struct sw_flow_key_range range;
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struct sw_flow_key key;
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};
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@ -34,6 +34,7 @@
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#include <net/ndisc.h>
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#define TBL_MIN_BUCKETS 1024
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#define MASK_ARRAY_SIZE_MIN 16
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#define REHASH_INTERVAL (10 * 60 * HZ)
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#define MC_HASH_SHIFT 8
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@ -168,9 +169,51 @@ static struct table_instance *table_instance_alloc(int new_size)
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return ti;
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}
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static struct mask_array *tbl_mask_array_alloc(int size)
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{
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struct mask_array *new;
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size = max(MASK_ARRAY_SIZE_MIN, size);
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new = kzalloc(sizeof(struct mask_array) +
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sizeof(struct sw_flow_mask *) * size, GFP_KERNEL);
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if (!new)
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return NULL;
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new->count = 0;
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new->max = size;
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return new;
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}
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static int tbl_mask_array_realloc(struct flow_table *tbl, int size)
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{
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struct mask_array *old;
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struct mask_array *new;
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new = tbl_mask_array_alloc(size);
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if (!new)
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return -ENOMEM;
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old = ovsl_dereference(tbl->mask_array);
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if (old) {
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int i;
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for (i = 0; i < old->max; i++) {
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if (ovsl_dereference(old->masks[i]))
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new->masks[new->count++] = old->masks[i];
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}
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}
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rcu_assign_pointer(tbl->mask_array, new);
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kfree_rcu(old, rcu);
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return 0;
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}
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int ovs_flow_tbl_init(struct flow_table *table)
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{
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struct table_instance *ti, *ufid_ti;
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struct mask_array *ma;
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table->mask_cache = __alloc_percpu(sizeof(struct mask_cache_entry) *
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MC_HASH_ENTRIES,
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@ -178,9 +221,13 @@ int ovs_flow_tbl_init(struct flow_table *table)
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if (!table->mask_cache)
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return -ENOMEM;
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ma = tbl_mask_array_alloc(MASK_ARRAY_SIZE_MIN);
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if (!ma)
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goto free_mask_cache;
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ti = table_instance_alloc(TBL_MIN_BUCKETS);
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if (!ti)
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goto free_mask_cache;
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goto free_mask_array;
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ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
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if (!ufid_ti)
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@ -188,7 +235,7 @@ int ovs_flow_tbl_init(struct flow_table *table)
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rcu_assign_pointer(table->ti, ti);
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rcu_assign_pointer(table->ufid_ti, ufid_ti);
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INIT_LIST_HEAD(&table->mask_list);
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rcu_assign_pointer(table->mask_array, ma);
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table->last_rehash = jiffies;
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table->count = 0;
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table->ufid_count = 0;
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@ -196,6 +243,8 @@ int ovs_flow_tbl_init(struct flow_table *table)
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free_ti:
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__table_instance_destroy(ti);
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free_mask_array:
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kfree(ma);
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free_mask_cache:
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free_percpu(table->mask_cache);
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return -ENOMEM;
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@ -255,6 +304,7 @@ void ovs_flow_tbl_destroy(struct flow_table *table)
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struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
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free_percpu(table->mask_cache);
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kfree_rcu(rcu_dereference_raw(table->mask_array), rcu);
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table_instance_destroy(ti, ufid_ti, false);
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}
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@ -460,17 +510,27 @@ static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
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static struct sw_flow *flow_lookup(struct flow_table *tbl,
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struct table_instance *ti,
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struct mask_array *ma,
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const struct sw_flow_key *key,
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u32 *n_mask_hit)
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u32 *n_mask_hit,
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u32 *index)
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{
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struct sw_flow_mask *mask;
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struct sw_flow *flow;
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int i;
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list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
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flow = masked_flow_lookup(ti, key, mask, n_mask_hit);
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if (flow) /* Found */
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return flow;
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for (i = 0; i < ma->max; i++) {
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struct sw_flow_mask *mask;
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mask = rcu_dereference_ovsl(ma->masks[i]);
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if (mask) {
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flow = masked_flow_lookup(ti, key, mask, n_mask_hit);
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if (flow) { /* Found */
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*index = i;
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return flow;
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}
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}
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}
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return NULL;
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}
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@ -486,6 +546,7 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
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u32 skb_hash,
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u32 *n_mask_hit)
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{
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struct mask_array *ma = rcu_dereference_ovsl(tbl->mask_array);
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struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
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struct mask_cache_entry *entries, *ce, *del;
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struct sw_flow *flow;
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@ -493,8 +554,11 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
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int seg;
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*n_mask_hit = 0;
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if (unlikely(!skb_hash))
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return flow_lookup(tbl, ti, key, n_mask_hit);
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if (unlikely(!skb_hash)) {
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u32 __always_unused mask_index;
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return flow_lookup(tbl, ti, ma, key, n_mask_hit, &mask_index);
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}
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del = NULL;
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entries = this_cpu_ptr(tbl->mask_cache);
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@ -507,37 +571,33 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
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if (ce->skb_hash == skb_hash) {
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struct sw_flow_mask *mask;
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int i;
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struct sw_flow *flow;
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i = 0;
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list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
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if (ce->mask_index == i++) {
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flow = masked_flow_lookup(ti, key, mask,
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n_mask_hit);
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if (flow) /* Found */
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return flow;
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break;
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}
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mask = rcu_dereference_ovsl(ma->masks[ce->mask_index]);
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if (mask) {
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flow = masked_flow_lookup(ti, key, mask,
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n_mask_hit);
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if (flow) /* Found */
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return flow;
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}
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del = ce;
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break;
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}
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if (!del || (del->skb_hash && !ce->skb_hash)) {
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if (!del || (del->skb_hash && !ce->skb_hash) ||
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(rcu_dereference_ovsl(ma->masks[del->mask_index]) &&
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!rcu_dereference_ovsl(ma->masks[ce->mask_index]))) {
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del = ce;
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}
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hash >>= MC_HASH_SHIFT;
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}
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flow = flow_lookup(tbl, ti, key, n_mask_hit);
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flow = flow_lookup(tbl, ti, ma, key, n_mask_hit, &del->mask_index);
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if (flow) {
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if (flow)
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del->skb_hash = skb_hash;
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del->mask_index = (*n_mask_hit - 1);
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}
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return flow;
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}
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@ -546,26 +606,38 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
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const struct sw_flow_key *key)
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{
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struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
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u32 __always_unused n_mask_hit;
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struct mask_array *ma = rcu_dereference_ovsl(tbl->mask_array);
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return flow_lookup(tbl, ti, key, &n_mask_hit);
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u32 __always_unused n_mask_hit;
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u32 __always_unused index;
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return flow_lookup(tbl, ti, ma, key, &n_mask_hit, &index);
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}
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struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
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const struct sw_flow_match *match)
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{
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struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
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struct sw_flow_mask *mask;
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struct sw_flow *flow;
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u32 __always_unused n_mask_hit;
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struct mask_array *ma = ovsl_dereference(tbl->mask_array);
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int i;
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/* Always called under ovs-mutex. */
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list_for_each_entry(mask, &tbl->mask_list, list) {
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for (i = 0; i < ma->max; i++) {
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struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
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u32 __always_unused n_mask_hit;
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struct sw_flow_mask *mask;
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struct sw_flow *flow;
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mask = ovsl_dereference(ma->masks[i]);
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if (!mask)
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continue;
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flow = masked_flow_lookup(ti, match->key, mask, &n_mask_hit);
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if (flow && ovs_identifier_is_key(&flow->id) &&
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ovs_flow_cmp_unmasked_key(flow, match))
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ovs_flow_cmp_unmasked_key(flow, match)) {
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return flow;
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}
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}
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return NULL;
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}
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@ -611,13 +683,9 @@ struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl,
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int ovs_flow_tbl_num_masks(const struct flow_table *table)
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{
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struct sw_flow_mask *mask;
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int num = 0;
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struct mask_array *ma = rcu_dereference_ovsl(table->mask_array);
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list_for_each_entry(mask, &table->mask_list, list)
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num++;
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return num;
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return ma->count;
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}
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static struct table_instance *table_instance_expand(struct table_instance *ti,
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@ -638,8 +706,19 @@ static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
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mask->ref_count--;
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if (!mask->ref_count) {
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list_del_rcu(&mask->list);
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kfree_rcu(mask, rcu);
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struct mask_array *ma;
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int i;
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ma = ovsl_dereference(tbl->mask_array);
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for (i = 0; i < ma->max; i++) {
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if (mask == ovsl_dereference(ma->masks[i])) {
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RCU_INIT_POINTER(ma->masks[i], NULL);
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ma->count--;
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kfree_rcu(mask, rcu);
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return;
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}
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}
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BUG();
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}
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}
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}
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@ -689,13 +768,16 @@ static bool mask_equal(const struct sw_flow_mask *a,
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static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl,
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const struct sw_flow_mask *mask)
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{
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struct list_head *ml;
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struct mask_array *ma;
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int i;
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list_for_each(ml, &tbl->mask_list) {
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struct sw_flow_mask *m;
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m = container_of(ml, struct sw_flow_mask, list);
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if (mask_equal(mask, m))
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return m;
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ma = ovsl_dereference(tbl->mask_array);
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for (i = 0; i < ma->max; i++) {
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struct sw_flow_mask *t;
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t = ovsl_dereference(ma->masks[i]);
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if (t && mask_equal(mask, t))
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return t;
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}
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return NULL;
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@ -706,15 +788,44 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
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const struct sw_flow_mask *new)
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{
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struct sw_flow_mask *mask;
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mask = flow_mask_find(tbl, new);
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if (!mask) {
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struct mask_array *ma;
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int i;
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/* Allocate a new mask if none exsits. */
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mask = mask_alloc();
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if (!mask)
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return -ENOMEM;
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mask->key = new->key;
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mask->range = new->range;
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list_add_tail_rcu(&mask->list, &tbl->mask_list);
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/* Add mask to mask-list. */
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ma = ovsl_dereference(tbl->mask_array);
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if (ma->count >= ma->max) {
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int err;
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err = tbl_mask_array_realloc(tbl, ma->max +
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MASK_ARRAY_SIZE_MIN);
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if (err) {
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kfree(mask);
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return err;
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}
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ma = ovsl_dereference(tbl->mask_array);
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}
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for (i = 0; i < ma->max; i++) {
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const struct sw_flow_mask *t;
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t = ovsl_dereference(ma->masks[i]);
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if (!t) {
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rcu_assign_pointer(ma->masks[i], mask);
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ma->count++;
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break;
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}
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}
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} else {
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BUG_ON(!mask->ref_count);
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mask->ref_count++;
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@ -27,6 +27,12 @@ struct mask_cache_entry {
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u32 mask_index;
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};
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struct mask_array {
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struct rcu_head rcu;
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int count, max;
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struct sw_flow_mask __rcu *masks[];
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};
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struct table_instance {
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struct hlist_head *buckets;
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unsigned int n_buckets;
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@ -40,7 +46,7 @@ struct flow_table {
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struct table_instance __rcu *ti;
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struct table_instance __rcu *ufid_ti;
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struct mask_cache_entry __percpu *mask_cache;
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struct list_head mask_list;
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struct mask_array __rcu *mask_array;
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unsigned long last_rehash;
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unsigned int count;
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unsigned int ufid_count;
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