From a2b358b1faf6e762e1d29a931d83c7735ac9a77d Mon Sep 17 00:00:00 2001 From: Florin Coras Date: Fri, 18 Mar 2022 12:50:03 -0700 Subject: udp: use pool safe reallocs Type: improvement Signed-off-by: Florin Coras Change-Id: I5bd0b300af07424d1ce4807fa0b17e375001f089 --- src/vnet/udp/udp.c | 29 +++---------------------- src/vnet/udp/udp.h | 55 +++++------------------------------------------- src/vnet/udp/udp_input.c | 5 ----- 3 files changed, 8 insertions(+), 81 deletions(-) (limited to 'src') diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c index d2a2b6323f0..43391f9f4e5 100644 --- a/src/vnet/udp/udp.c +++ b/src/vnet/udp/udp.c @@ -94,22 +94,10 @@ udp_connection_alloc (u32 thread_index) { udp_main_t *um = &udp_main; udp_connection_t *uc; - u32 will_expand = pool_get_will_expand (um->connections[thread_index]); - if (PREDICT_FALSE (will_expand)) - { - clib_spinlock_lock_if_init (&udp_main.peekers_write_locks - [thread_index]); - pool_get_aligned (udp_main.connections[thread_index], uc, - CLIB_CACHE_LINE_BYTES); - clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks - [thread_index]); - } - else - { - pool_get_aligned (um->connections[thread_index], uc, - CLIB_CACHE_LINE_BYTES); - } + pool_get_aligned_safe (um->connections[thread_index], uc, + CLIB_CACHE_LINE_BYTES); + clib_memset (uc, 0, sizeof (*uc)); uc->c_c_index = uc - um->connections[thread_index]; uc->c_thread_index = thread_index; @@ -502,7 +490,6 @@ udp_init (vlib_main_t * vm) vlib_thread_main_t *tm = vlib_get_thread_main (); u32 num_threads; ip_protocol_info_t *pi; - int i; /* * Registrations @@ -527,16 +514,6 @@ udp_init (vlib_main_t * vm) num_threads = 1 /* main thread */ + tm->n_threads; vec_validate (um->connections, num_threads - 1); - vec_validate (um->connection_peekers, num_threads - 1); - vec_validate (um->peekers_readers_locks, num_threads - 1); - vec_validate (um->peekers_write_locks, num_threads - 1); - - if (num_threads > 1) - for (i = 0; i < num_threads; i++) - { - clib_spinlock_init (&um->peekers_readers_locks[i]); - clib_spinlock_init (&um->peekers_write_locks[i]); - } um->local_to_input_edge[UDP_IP4] = vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index); diff --git a/src/vnet/udp/udp.h b/src/vnet/udp/udp.h index f157711ba2b..92bcd1c44e7 100644 --- a/src/vnet/udp/udp.h +++ b/src/vnet/udp/udp.h @@ -115,9 +115,6 @@ typedef struct * Per-worker thread udp connection pools used with session layer */ udp_connection_t **connections; - u32 *connection_peekers; - clib_spinlock_t *peekers_readers_locks; - clib_spinlock_t *peekers_write_locks; udp_connection_t *listener_pool; u16 default_mtu; @@ -161,65 +158,23 @@ udp_connection_from_transport (transport_connection_t * tc) return ((udp_connection_t *) tc); } -always_inline u32 -udp_connection_index (udp_connection_t * uc) -{ - return (uc - udp_main.connections[uc->c_thread_index]); -} - void udp_connection_free (udp_connection_t * uc); udp_connection_t *udp_connection_alloc (u32 thread_index); -/** - * Acquires a lock that blocks a connection pool from expanding. - */ -always_inline void -udp_pool_add_peeker (u32 thread_index) -{ - if (thread_index != vlib_get_thread_index ()) - return; - clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]); - udp_main.connection_peekers[thread_index] += 1; - if (udp_main.connection_peekers[thread_index] == 1) - clib_spinlock_lock_if_init (&udp_main.peekers_write_locks[thread_index]); - clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks - [thread_index]); -} - -always_inline void -udp_pool_remove_peeker (u32 thread_index) -{ - if (thread_index != vlib_get_thread_index ()) - return; - ASSERT (udp_main.connection_peekers[thread_index] > 0); - clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]); - udp_main.connection_peekers[thread_index] -= 1; - if (udp_main.connection_peekers[thread_index] == 0) - clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks - [thread_index]); - clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks - [thread_index]); -} - always_inline udp_connection_t * udp_connection_clone_safe (u32 connection_index, u32 thread_index) { + u32 current_thread_index = vlib_get_thread_index (), new_index; udp_connection_t *old_c, *new_c; - u32 current_thread_index = vlib_get_thread_index (); - new_c = udp_connection_alloc (current_thread_index); - /* If during the memcpy pool is reallocated AND the memory allocator - * decides to give the old chunk of memory to somebody in a hurry to - * scribble something on it, we have a problem. So add this thread as - * a session pool peeker. - */ - udp_pool_add_peeker (thread_index); + new_c = udp_connection_alloc (current_thread_index); + new_index = new_c->c_c_index; + /* Connection pool always realloced with barrier */ old_c = udp_main.connections[thread_index] + connection_index; clib_memcpy_fast (new_c, old_c, sizeof (*new_c)); old_c->flags |= UDP_CONN_F_MIGRATED; - udp_pool_remove_peeker (thread_index); new_c->c_thread_index = current_thread_index; - new_c->c_c_index = udp_connection_index (new_c); + new_c->c_c_index = new_index; new_c->c_fib_index = old_c->c_fib_index; /* Assume cloned sessions don't need lock */ new_c->rx_lock = 0; diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c index e701ca5d12e..f6c55f6722e 100644 --- a/src/vnet/udp/udp_input.c +++ b/src/vnet/udp/udp_input.c @@ -251,11 +251,6 @@ udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, goto done; } - /* - * If session exists pool peeker lock is taken at this point unless - * the session is already on the right thread or is a listener - */ - if (s0->session_state == SESSION_STATE_OPENED) { u8 queue_event = 1; -- cgit 1.2.3-korg