tcp: remove ho lock

Half-open sessions are allocated by main thread and cleaned up on main
with timers.

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I37f000920a45908b62b5501ae9d54a88a9e4c609

3 files changed, 0 insertions, 13 deletions

diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 16bf9451709..acb3868f419 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -189,11 +189,9 @@ static void
 tcp_half_open_connection_free (tcp_connection_t * tc)
 {
   tcp_main_t *tm = vnet_get_tcp_main ();
-  clib_spinlock_lock_if_init (&tm->half_open_lock);
   if (CLIB_DEBUG)
     clib_memset (tc, 0xFA, sizeof (*tc));
   pool_put (tm->half_open_connections, tc);
-  clib_spinlock_unlock_if_init (&tm->half_open_lock);
 }
 
 /**
@@ -818,7 +816,6 @@ tcp_session_open (transport_endpoint_cfg_t * rmt)
   /*
    * Create connection and send SYN
    */
-  clib_spinlock_lock_if_init (&tm->half_open_lock);
   tc = tcp_half_open_connection_new ();
   ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
   ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
@@ -836,7 +833,6 @@ tcp_session_open (transport_endpoint_cfg_t * rmt)
   tc->state = TCP_STATE_SYN_SENT;
   tcp_init_snd_vars (tc);
   tcp_send_syn (tc);
-  clib_spinlock_unlock_if_init (&tm->half_open_lock);
 
   return tc->c_c_index;
 }
@@ -1526,11 +1522,6 @@ tcp_main_enable (vlib_main_t * vm)
     pool_init_fixed (tm->half_open_connections,
 		     tcp_cfg.preallocated_half_open_connections);
 
-  if (num_threads > 1)
-    {
-      clib_spinlock_init (&tm->half_open_lock);
-    }
-
   tcp_initialize_iss_seed (tm);
 
   tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index a02a295e72b..2561e439794 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -221,8 +221,6 @@ typedef struct _tcp_main
   /** Dispatch table by state and flags */
   tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
 
-  clib_spinlock_t half_open_lock;
-
   /** Pool of half-open connections on which we've sent a SYN */
   tcp_connection_t *half_open_connections;
 
diff --git a/src/vnet/tcp/tcp_inlines.h b/src/vnet/tcp/tcp_inlines.h
index a0121308008..68eb4b147fa 100644
--- a/src/vnet/tcp/tcp_inlines.h
+++ b/src/vnet/tcp/tcp_inlines.h
@@ -67,10 +67,8 @@ always_inline tcp_connection_t *
 tcp_half_open_connection_get (u32 conn_index)
 {
   tcp_connection_t *tc = 0;
-  clib_spinlock_lock_if_init (&tcp_main.half_open_lock);
   if (!pool_is_free_index (tcp_main.half_open_connections, conn_index))
     tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index);
-  clib_spinlock_unlock_if_init (&tcp_main.half_open_lock);
   return tc;
 }