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authorFlorin Coras <fcoras@cisco.com>2019-10-16 22:06:08 -0700
committerAndrew Yourtchenko <ayourtch@gmail.com>2019-11-18 12:31:58 +0000
commit57997c8748efd9023759e7270cedbf2124cf8d6e (patch)
tree627573f2b61789ecab49a9418961f81201a0f95c /src/vnet
parentfd2f6f89e6610eac6110054b6c9cd190fa4c57e1 (diff)
session tcp: infra for transports to send buffers
Type: feature Add infra that allows transpors to enqueue pending buffers without the need to build and manage their own pending frames. An important benefit is the fact that buffer wire/tx ordering is ensured by session layer. Change-Id: I764fd1693d610b321a1d0c84b648a314f14583db Signed-off-by: Florin Coras <fcoras@cisco.com> (cherry picked from commit 2a7ea2ee92d6dc4800ee21323d3324a9e8449dcf)
Diffstat (limited to 'src/vnet')
-rw-r--r--src/vnet/session/session.h15
-rw-r--r--src/vnet/session/session_node.c14
-rw-r--r--src/vnet/tcp/tcp.h4
-rw-r--r--src/vnet/tcp/tcp_output.c63
4 files changed, 36 insertions, 60 deletions
diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index 1d3ae0ca4b2..f738f3957e2 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -116,6 +116,12 @@ typedef struct session_worker_
/** Peekers rw lock */
clib_rwlock_t peekers_rw_locks;
+ /** Vector of buffers to be sent */
+ u32 *pending_tx_buffers;
+
+ /** Vector of nexts for the pending tx buffers */
+ u16 *pending_tx_nexts;
+
#if SESSION_DEBUG
/** last event poll time by thread */
f64 last_event_poll;
@@ -611,6 +617,15 @@ do { \
int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
int session_main_flush_all_enqueue_events (u8 transport_proto);
void session_flush_frames_main_thread (vlib_main_t * vm);
+
+always_inline void
+session_add_pending_tx_buffer (session_type_t st, u32 thread_index, u32 bi)
+{
+ session_worker_t *wrk = session_main_get_worker (thread_index);
+ vec_add1 (wrk->pending_tx_buffers, bi);
+ vec_add1 (wrk->pending_tx_nexts, session_main.session_type_to_next[st]);
+}
+
ssvm_private_t *session_main_get_evt_q_segment (void);
void session_node_enable_disable (u8 is_en);
clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 824085aecb9..d4470e0b283 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -1234,6 +1234,17 @@ session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
}
}
+static void
+session_flush_pending_tx_buffers (session_worker_t * wrk,
+ vlib_node_runtime_t * node)
+{
+ vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
+ wrk->pending_tx_nexts,
+ vec_len (wrk->pending_tx_nexts));
+ vec_reset_length (wrk->pending_tx_buffers);
+ vec_reset_length (wrk->pending_tx_nexts);
+}
+
static uword
session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
@@ -1339,6 +1350,9 @@ session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
};
}
+ if (vec_len (wrk->pending_tx_buffers))
+ session_flush_pending_tx_buffers (wrk, node);
+
vlib_node_increment_counter (vm, session_queue_node.index,
SESSION_QUEUE_ERROR_TX, n_tx_packets);
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 8530ba499fc..3de19730309 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -511,9 +511,6 @@ typedef struct tcp_worker_ctx_
/** tx buffer free list */
u32 *tx_buffers;
- /** tx frames for tcp 4/6 output nodes */
- vlib_frame_t *tx_frames[2];
-
/** tx frames for ip 4/6 lookup nodes */
vlib_frame_t *ip_lookup_tx_frames[2];
@@ -790,7 +787,6 @@ void tcp_send_fin (tcp_connection_t * tc);
void tcp_send_ack (tcp_connection_t * tc);
void tcp_update_burst_snd_vars (tcp_connection_t * tc);
void tcp_update_rto (tcp_connection_t * tc);
-void tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4);
void tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk);
void tcp_send_window_update_ack (tcp_connection_t * tc);
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 620d19b21c3..2227ad4ac8c 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -674,51 +674,19 @@ tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
session_flush_frames_main_thread (wrk->vm);
}
-always_inline void
-tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4, u8 flush)
+static void
+tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
{
- u32 *to_next, next_index;
- vlib_frame_t *f;
+ session_type_t st;
b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
b->error = 0;
- /* Decide where to send the packet */
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
- tcp_trajectory_add_start (b, 2);
-
- /* Get frame to v4/6 output node */
- f = wrk->tx_frames[!is_ip4];
- if (!f)
- {
- f = vlib_get_frame_to_node (wrk->vm, next_index);
- ASSERT (f);
- wrk->tx_frames[!is_ip4] = f;
- }
- to_next = vlib_frame_vector_args (f);
- to_next[f->n_vectors] = bi;
- f->n_vectors += 1;
- if (flush || f->n_vectors == VLIB_FRAME_SIZE)
- {
- vlib_put_frame_to_node (wrk->vm, next_index, f);
- wrk->tx_frames[!is_ip4] = 0;
- }
-}
-
-static void
-tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
-{
- tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
+ st = session_type_from_proto_and_ip (TRANSPORT_PROTO_TCP, is_ip4);
+ session_add_pending_tx_buffer (st, wrk->vm->thread_index, bi);
}
-static void
-tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
-{
- tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
-}
#endif /* CLIB_MARCH_VARIANT */
static int
@@ -1015,21 +983,6 @@ tcp_send_synack (tcp_connection_t * tc)
}
/**
- * Flush tx frame populated by retransmits and timer pops
- */
-void
-tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
-{
- if (wrk->tx_frames[!is_ip4])
- {
- u32 next_index;
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
- vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
- wrk->tx_frames[!is_ip4] = 0;
- }
-}
-
-/**
* Flush ip lookup tx frames populated by timer pops
*/
static void
@@ -1051,8 +1004,6 @@ tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
void
tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
{
- tcp_flush_frame_to_output (wrk, 1);
- tcp_flush_frame_to_output (wrk, 0);
tcp_flush_frame_to_ip_lookup (wrk, 1);
tcp_flush_frame_to_ip_lookup (wrk, 0);
}
@@ -1093,7 +1044,7 @@ tcp_send_fin (tcp_connection_t * tc)
b = vlib_get_buffer (vm, bi);
tcp_init_buffer (vm, b);
tcp_make_fin (tc, b);
- tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
+ tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
TCP_EVT (TCP_EVT_FIN_SENT, tc);
/* Account for the FIN */
tc->snd_nxt += 1;