session: support for cl port reuse
Adds support for connectionless listener port reuse. Until now, cl
listeners had fifos allocated to them and therefore only one app worker
could ever listen, i.e., a session cannot have multiple fifos.
To circumvent the limitation, this separates the fifos from the listener
by allocating new cl sessions for each app worker that reuses the app
listener. Flows are hashed to app worker cl sessions but, for now, this
is not a consistent/fixed hash.
Type: improvement
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Ic6533cd47f2765903669f88c288bd592fb17a19e
diff --git a/src/vnet/session/application.c b/src/vnet/session/application.c
index fdd5a0a..5c8efe1 100644
--- a/src/vnet/session/application.c
+++ b/src/vnet/session/application.c
@@ -52,6 +52,7 @@
app_listener_free (application_t * app, app_listener_t * app_listener)
{
clib_bitmap_free (app_listener->workers);
+ vec_free (app_listener->cl_listeners);
if (CLIB_DEBUG)
clib_memset (app_listener, 0xfa, sizeof (*app_listener));
pool_put (app->listeners, app_listener);
@@ -321,6 +322,13 @@
return listen_session_get (al->local_index);
}
+session_t *
+app_listener_get_wrk_cl_session (app_listener_t *al, u32 wrk_map_index)
+{
+ u32 si = vec_elt (al->cl_listeners, wrk_map_index);
+ return session_get (si, 0 /* listener thread */);
+}
+
static app_worker_map_t *
app_worker_map_alloc (application_t * app)
{
@@ -1017,6 +1025,53 @@
return app_listener_select_worker (app, al);
}
+always_inline u32
+app_listener_cl_flow_hash (session_dgram_hdr_t *hdr)
+{
+ u32 hash = 0;
+
+ if (hdr->is_ip4)
+ {
+ hash = clib_crc32c_u32 (hash, hdr->rmt_ip.ip4.as_u32);
+ hash = clib_crc32c_u32 (hash, hdr->lcl_ip.ip4.as_u32);
+ hash = clib_crc32c_u16 (hash, hdr->rmt_port);
+ hash = clib_crc32c_u16 (hash, hdr->lcl_port);
+ }
+ else
+ {
+ hash = clib_crc32c_u64 (hash, hdr->rmt_ip.ip6.as_u64[0]);
+ hash = clib_crc32c_u64 (hash, hdr->rmt_ip.ip6.as_u64[1]);
+ hash = clib_crc32c_u64 (hash, hdr->lcl_ip.ip6.as_u64[0]);
+ hash = clib_crc32c_u64 (hash, hdr->lcl_ip.ip6.as_u64[1]);
+ hash = clib_crc32c_u16 (hash, hdr->rmt_port);
+ hash = clib_crc32c_u16 (hash, hdr->lcl_port);
+ }
+
+ return hash;
+}
+
+session_t *
+app_listener_select_wrk_cl_session (session_t *ls, session_dgram_hdr_t *hdr)
+{
+ u32 wrk_map_index = 0;
+ application_t *app;
+ app_listener_t *al;
+
+ app = application_get (ls->app_index);
+ al = app_listener_get (app, ls->al_index);
+ /* Crude test to check if only worker 0 is set */
+ if (al->workers[0] != 1)
+ {
+ u32 hash = app_listener_cl_flow_hash (hdr);
+ hash %= vec_len (al->workers) * sizeof (uword);
+ wrk_map_index = clib_bitmap_next_set (al->workers, hash);
+ if (wrk_map_index == ~0)
+ wrk_map_index = clib_bitmap_first_set (al->workers);
+ }
+
+ return app_listener_get_wrk_cl_session (al, wrk_map_index);
+}
+
int
application_alloc_worker_and_init (application_t * app, app_worker_t ** wrk)
{
diff --git a/src/vnet/session/application.h b/src/vnet/session/application.h
index 5505d91..7c63b90 100644
--- a/src/vnet/session/application.h
+++ b/src/vnet/session/application.h
@@ -106,6 +106,8 @@
session_handle_t ls_handle; /**< session handle of the local or global
listening session that also identifies
the app listener */
+ u32 *cl_listeners; /**< vector that maps app workers to their
+ cl sessions with fifos */
} app_listener_t;
typedef enum app_rx_mq_flags_
@@ -254,6 +256,8 @@
session_handle_t app_listener_handle (app_listener_t * app_listener);
app_listener_t *app_listener_lookup (application_t * app,
session_endpoint_cfg_t * sep);
+session_t *app_listener_select_wrk_cl_session (session_t *ls,
+ session_dgram_hdr_t *hdr);
/**
* Get app listener handle for listening session
@@ -280,6 +284,7 @@
app_listener_t *app_listener_get_w_session (session_t * ls);
session_t *app_listener_get_session (app_listener_t * al);
session_t *app_listener_get_local_session (app_listener_t * al);
+session_t *app_listener_get_wrk_cl_session (app_listener_t *al, u32 wrk_index);
application_t *application_get (u32 index);
application_t *application_get_if_valid (u32 index);
diff --git a/src/vnet/session/application_worker.c b/src/vnet/session/application_worker.c
index 960d916..ea5a4db 100644
--- a/src/vnet/session/application_worker.c
+++ b/src/vnet/session/application_worker.c
@@ -186,12 +186,67 @@
}
int
+app_worker_alloc_wrk_cl_session (app_worker_t *app_wrk, session_t *ls)
+{
+ svm_fifo_t *rx_fifo = 0, *tx_fifo = 0;
+ segment_manager_t *sm;
+ session_handle_t lsh;
+ app_listener_t *al;
+ session_t *s;
+
+ al = app_listener_get_w_session (ls);
+ sm = app_worker_get_listen_segment_manager (app_wrk, ls);
+ lsh = session_handle (ls);
+
+ s = session_alloc (0 /* listener on main worker */);
+ session_set_state (s, SESSION_STATE_LISTENING);
+ s->flags |= SESSION_F_IS_CLESS;
+ s->app_wrk_index = app_wrk->wrk_index;
+ ls = session_get_from_handle (lsh);
+ s->session_type = ls->session_type;
+ s->connection_index = ls->connection_index;
+
+ segment_manager_alloc_session_fifos (sm, s->thread_index, &rx_fifo,
+ &tx_fifo);
+
+ rx_fifo->shr->master_session_index = s->session_index;
+ rx_fifo->master_thread_index = s->thread_index;
+
+ tx_fifo->shr->master_session_index = s->session_index;
+ tx_fifo->master_thread_index = s->thread_index;
+
+ s->rx_fifo = rx_fifo;
+ s->tx_fifo = tx_fifo;
+
+ vec_validate (al->cl_listeners, app_wrk->wrk_map_index);
+ al->cl_listeners[app_wrk->wrk_map_index] = s->session_index;
+
+ return 0;
+}
+
+void
+app_worker_free_wrk_cl_session (app_worker_t *app_wrk, session_t *ls)
+{
+ app_listener_t *al;
+ session_t *s;
+
+ al = app_listener_get_w_session (ls);
+
+ s = app_listener_get_wrk_cl_session (al, app_wrk->wrk_map_index);
+ segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
+ session_free (s);
+
+ al->cl_listeners[app_wrk->wrk_map_index] = SESSION_INVALID_INDEX;
+}
+
+int
app_worker_init_listener (app_worker_t * app_wrk, session_t * ls)
{
segment_manager_t *sm;
/* Allocate segment manager. All sessions derived out of a listen session
- * have fifos allocated by the same segment manager. */
+ * have fifos allocated by the same segment manager.
+ * TODO(fcoras): limit memory consumption by cless listeners */
if (!(sm = app_worker_alloc_segment_manager (app_wrk)))
return SESSION_E_ALLOC;
@@ -202,12 +257,9 @@
hash_set (app_wrk->listeners_table, listen_session_get_handle (ls),
segment_manager_index (sm));
- if (transport_connection_is_cless (session_get_transport (ls)))
- {
- if (ls->rx_fifo)
- return SESSION_E_NOSUPPORT;
- return app_worker_alloc_session_fifos (sm, ls);
- }
+ if (ls->flags & SESSION_F_IS_CLESS)
+ return app_worker_alloc_wrk_cl_session (app_wrk, ls);
+
return 0;
}
@@ -276,12 +328,8 @@
if (PREDICT_FALSE (!sm_indexp))
return;
- /* Dealloc fifos, if any (dgram listeners) */
- if (ls->rx_fifo)
- {
- segment_manager_dealloc_fifos (ls->rx_fifo, ls->tx_fifo);
- ls->tx_fifo = ls->rx_fifo = 0;
- }
+ if (ls->flags & SESSION_F_IS_CLESS)
+ app_worker_free_wrk_cl_session (app_wrk, ls);
/* Try to cleanup segment manager */
sm = segment_manager_get (*sm_indexp);
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c
index 2afc37a..0d2e1b1 100644
--- a/src/vnet/session/session.c
+++ b/src/vnet/session/session.c
@@ -867,11 +867,22 @@
}
int
+session_enqueue_dgram_connection2 (session_t *s, session_dgram_hdr_t *hdr,
+ vlib_buffer_t *b, u8 proto, u8 queue_event)
+{
+ return session_enqueue_dgram_connection_inline (s, hdr, b, proto,
+ queue_event, 1 /* is_cl */);
+}
+
+int
session_enqueue_dgram_connection_cl (session_t *s, session_dgram_hdr_t *hdr,
vlib_buffer_t *b, u8 proto,
u8 queue_event)
{
- return session_enqueue_dgram_connection_inline (s, hdr, b, proto,
+ session_t *awls;
+
+ awls = app_listener_select_wrk_cl_session (s, hdr);
+ return session_enqueue_dgram_connection_inline (awls, hdr, b, proto,
queue_event, 1 /* is_cl */);
}
diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index ebaad5a..78158d5 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -495,6 +495,9 @@
session_dgram_hdr_t * hdr,
vlib_buffer_t * b, u8 proto,
u8 queue_event);
+int session_enqueue_dgram_connection2 (session_t *s, session_dgram_hdr_t *hdr,
+ vlib_buffer_t *b, u8 proto,
+ u8 queue_event);
int session_enqueue_dgram_connection_cl (session_t *s,
session_dgram_hdr_t *hdr,
vlib_buffer_t *b, u8 proto,
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index 0574a58..84d44e9 100644
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -276,7 +276,7 @@
session_handle_t handle, int rv)
{
session_bound_msg_t m = { 0 };
- transport_endpoint_t tep;
+ transport_connection_t *ltc;
fifo_segment_t *eq_seg;
app_worker_t *app_wrk;
application_t *app;
@@ -298,23 +298,24 @@
else
ls = app_listener_get_local_session (al);
- session_get_endpoint (ls, &tep, 1 /* is_lcl */);
- m.lcl_port = tep.port;
- m.lcl_is_ip4 = tep.is_ip4;
- clib_memcpy_fast (m.lcl_ip, &tep.ip, sizeof (tep.ip));
+ ltc = session_get_transport (ls);
+ m.lcl_port = ltc->lcl_port;
+ m.lcl_is_ip4 = ltc->is_ip4;
+ clib_memcpy_fast (m.lcl_ip, <c->lcl_ip, sizeof (m.lcl_ip));
app = application_get (app_wrk->app_index);
eq_seg = application_get_rx_mqs_segment (app);
m.vpp_evt_q = fifo_segment_msg_q_offset (eq_seg, ls->thread_index);
m.mq_index = ls->thread_index;
- if (session_transport_service_type (ls) == TRANSPORT_SERVICE_CL &&
- ls->rx_fifo)
+ if (transport_connection_is_cless (ltc))
{
+ session_t *wrk_ls;
m.mq_index = transport_cl_thread ();
m.vpp_evt_q = fifo_segment_msg_q_offset (eq_seg, m.mq_index);
- m.rx_fifo = fifo_segment_fifo_offset (ls->rx_fifo);
- m.tx_fifo = fifo_segment_fifo_offset (ls->tx_fifo);
- m.segment_handle = session_segment_handle (ls);
+ wrk_ls = app_listener_get_wrk_cl_session (al, app_wrk->wrk_map_index);
+ m.rx_fifo = fifo_segment_fifo_offset (wrk_ls->rx_fifo);
+ m.tx_fifo = fifo_segment_fifo_offset (wrk_ls->tx_fifo);
+ m.segment_handle = session_segment_handle (wrk_ls);
}
snd_msg: