Paolo Valerio <[email protected]> writes:

> while at it, changes struct zone_limit initialization in
> zone_limit_create() in order to use atomic init operations instead of
> relying on memset() which, although correctly initializes the struct,
> is semantially not aware of atomics.

semantically

> Signed-off-by: Paolo Valerio <[email protected]>
> ---
>  lib/conntrack-private.h |  2 +-
>  lib/conntrack.c         | 19 ++++++++++++-------
>  2 files changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/lib/conntrack-private.h b/lib/conntrack-private.h
> index 2c625d710..2770470d1 100644
> --- a/lib/conntrack-private.h
> +++ b/lib/conntrack-private.h
> @@ -201,7 +201,7 @@ enum ct_ephemeral_range {
>  
>  struct conntrack_zone_limit {
>      int32_t zone;
> -    uint32_t limit;
> +    atomic_uint32_t limit;
>      atomic_count count;
>      uint32_t zone_limit_seq; /* Used to disambiguate zone limit counts. */
>  };
> diff --git a/lib/conntrack.c b/lib/conntrack.c
> index 0481a8c8a..ac0790e11 100644
> --- a/lib/conntrack.c
> +++ b/lib/conntrack.c
> @@ -341,7 +341,7 @@ zone_limit_get(struct conntrack *ct, int32_t zone)
>      struct zone_limit *zl = zone_limit_lookup_or_default(ct, zone);
>      if (zl) {
>          czl.zone = zl->czl.zone;
> -        czl.limit = zl->czl.limit;
> +        atomic_read_relaxed(&zl->czl.limit, &czl.limit);
>          czl.count = atomic_count_get(&zl->czl.count);
>      }
>      return czl;
> @@ -358,8 +358,9 @@ zone_limit_create(struct conntrack *ct, int32_t zone, 
> uint32_t limit)
>      }
>  
>      if (zone >= DEFAULT_ZONE && zone <= MAX_ZONE) {
> -        zl = xzalloc(sizeof *zl);
> -        zl->czl.limit = limit;
> +        zl = xmalloc(sizeof *zl);
> +        atomic_init(&zl->czl.limit, limit);
> +        atomic_count_init(&zl->czl.count, 0);
>          zl->czl.zone = zone;
>          zl->czl.zone_limit_seq = ct->zone_limit_seq++;
>          uint32_t hash = zone_key_hash(zone, ct->hash_basis);
> @@ -376,7 +377,7 @@ zone_limit_update(struct conntrack *ct, int32_t zone, 
> uint32_t limit)
>      int err = 0;
>      struct zone_limit *zl = zone_limit_lookup(ct, zone);
>      if (zl) {
> -        zl->czl.limit = limit;
> +        atomic_store_relaxed(&zl->czl.limit, limit);
>          VLOG_INFO("Changed zone limit of %u for zone %d", limit, zone);
>      } else {
>          ovs_mutex_lock(&ct->ct_lock);
> @@ -916,12 +917,16 @@ conn_not_found(struct conntrack *ct, struct dp_packet 
> *pkt,
>      }
>  
>      if (commit) {
> +        uint32_t czl_limit;
>          struct conn_key_node *fwd_key_node, *rev_key_node;
>          struct zone_limit *zl = zone_limit_lookup_or_default(ct,
>                                                               ctx->key.zone);
> -        if (zl && atomic_count_get(&zl->czl.count) >= zl->czl.limit) {
> -            COVERAGE_INC(conntrack_zone_full);
> -            return nc;
> +        if (zl) {
> +            atomic_read_relaxed(&zl->czl.limit, &czl_limit);
> +            if (atomic_count_get(&zl->czl.count) >= czl_limit) {
> +                COVERAGE_INC(conntrack_zone_full);
> +                return nc;
> +            }
>          }
>  
>          unsigned int n_conn_limit;

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