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authorAndrew Yourtchenko <ayourtch@gmail.com>2018-02-05 17:27:57 +0100
committerDamjan Marion <dmarion.lists@gmail.com>2018-02-08 10:01:09 +0000
commit1c6e5cf6905b2bd951982da9b712b13e2cb21295 (patch)
tree33e8624eb919a2e72e2ce8ea8bfe8e80906c17e8 /src/plugins/acl
parentacbde664374303027e261ac096647592ca929f03 (diff)
acl-plugin: an elog-based tracing implementation for troubleshooting the conn cleaner threads interactions
This replaces some of the early-stage commented-out printf()s with an elog-based debug collector. It is aimed to be "better than nothing" initial implementation to be available in the field. It will be refined/updated based on use. This initial code is focused on the main/worker threads interactions, hence uses just the worker tracks. This code adds a developer debug CLI "set acl-plugin session table event-trace 1", which allows to gather the events pertaining to connection cleaning. The CLI is deliberately not part of the online help, as the express declaration that the semantics/trace levels, etc. are subject to change without notice. Change-Id: I3536309f737b73e50639cd5780822dcde667fc2c Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
Diffstat (limited to 'src/plugins/acl')
-rw-r--r--src/plugins/acl/acl.c15
-rw-r--r--src/plugins/acl/acl.h2
-rw-r--r--src/plugins/acl/fa_node.c51
-rw-r--r--src/plugins/acl/fa_node.h117
4 files changed, 153 insertions, 32 deletions
diff --git a/src/plugins/acl/acl.c b/src/plugins/acl/acl.c
index 8e1880a1d6b..1f1517c333d 100644
--- a/src/plugins/acl/acl.c
+++ b/src/plugins/acl/acl.c
@@ -2522,6 +2522,21 @@ acl_set_aclplugin_fn (vlib_main_t * vm,
goto done;
}
}
+ if (unformat (input, "event-trace"))
+ {
+ if (!unformat (input, "%u", &val))
+ {
+ error = clib_error_return (0,
+ "expecting trace level, got `%U`",
+ format_unformat_error, input);
+ goto done;
+ }
+ else
+ {
+ am->trace_sessions = val;
+ goto done;
+ }
+ }
goto done;
}
if (unformat (input, "timeout"))
diff --git a/src/plugins/acl/acl.h b/src/plugins/acl/acl.h
index d38c12990de..41e216f089b 100644
--- a/src/plugins/acl/acl.h
+++ b/src/plugins/acl/acl.h
@@ -225,6 +225,8 @@ typedef struct {
uword fa_conn_table_hash_memory_size;
u64 fa_conn_table_max_entries;
+ int trace_sessions;
+
/*
* If the cleaner has to delete more than this number
* of connections, it halves the sleep time.
diff --git a/src/plugins/acl/fa_node.c b/src/plugins/acl/fa_node.c
index 3ac45c297ff..c8e3d2d3a3e 100644
--- a/src/plugins/acl/fa_node.c
+++ b/src/plugins/acl/fa_node.c
@@ -922,6 +922,7 @@ acl_fa_check_idle_sessions(acl_main_t *am, u16 thread_index, u64 now)
&& (acl_fa_conn_time_to_check(am, pw, now, thread_index,
pw->fa_conn_list_head[tt]))) {
fsid.session_index = pw->fa_conn_list_head[tt];
+ elog_acl_maybe_trace_X2(am, "acl_fa_check_idle_sessions: expire session %d on thread %d", "i4i4", (u32)fsid.session_index, (u32)thread_index);
vec_add1(pw->expired, fsid.session_index);
acl_fa_conn_list_delete_session(am, fsid);
}
@@ -1410,9 +1411,7 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
u16 thread_index = os_get_thread_index ();
acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
int num_expired;
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("\nacl_fa_worker_conn_cleaner: thread index %d now %lu\n\n", thread_index, now);
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner interrupt: now %lu", "i8", now);
/* allow another interrupt to be queued */
pw->interrupt_is_pending = 0;
if (pw->clear_in_process) {
@@ -1430,9 +1429,7 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
*/
if ((pw->pending_clear_sw_if_index_bitmap == 0)
|| (pw->serviced_sw_if_index_bitmap == 0)) {
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("WORKER-CLEAR: someone tried to call clear, but one of the bitmaps are empty");
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, someone tried to call clear but one of the bitmaps are empty", "i8", now);
clib_bitmap_zero(pw->pending_clear_sw_if_index_bitmap);
} else {
#ifdef FA_NODE_VERBOSE_DEBUG
@@ -1446,9 +1443,7 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
if (clib_bitmap_is_zero(pw->pending_clear_sw_if_index_bitmap)) {
/* if the cross-section is a zero vector, no need to do anything. */
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("WORKER: clearing done - nothing to do");
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, clearing done, nothing to do", "i8", now);
pw->clear_in_process = 0;
} else {
#ifdef FA_NODE_VERBOSE_DEBUG
@@ -1456,6 +1451,7 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
format_bitmap_hex, pw->pending_clear_sw_if_index_bitmap,
format_bitmap_hex, pw->serviced_sw_if_index_bitmap);
#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: swiping until %lu", "i8", now);
/* swipe through the connection lists until enqueue timestamps become above "now" */
pw->swipe_end_time = now;
}
@@ -1463,18 +1459,15 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
}
num_expired = acl_fa_check_idle_sessions(am, thread_index, now);
// clib_warning("WORKER-CLEAR: checked %d sessions (clear_in_progress: %d)", num_expired, pw->clear_in_process);
+ elog_acl_maybe_trace_X2(am, "acl_fa_worker_conn_cleaner: checked %d sessions (clear_in_process: %d)", "i4i4", (u32)num_expired, (u32)pw->clear_in_process);
if (pw->clear_in_process) {
if (0 == num_expired) {
/* we were clearing but we could not process any more connections. time to stop. */
clib_bitmap_zero(pw->pending_clear_sw_if_index_bitmap);
pw->clear_in_process = 0;
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("WORKER: clearing done, all done");
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, clearing done - all done", "i8", now);
} else {
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("WORKER-CLEAR: more work to do, raising interrupt");
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, more work to do - requesting interrupt", "i8", now);
/* should continue clearing.. So could they please sent an interrupt again? */
pw->interrupt_is_needed = 1;
}
@@ -1492,6 +1485,7 @@ acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
pw->interrupt_is_needed = 0;
pw->interrupt_is_unwanted = 0;
}
+ elog_acl_maybe_trace_X3(am, "acl_fa_worker_conn_cleaner: now %lu, interrupt needed: %u, interrupt unwanted: %u", "i8i4i4", now, ((u32)pw->interrupt_is_needed), ((u32)pw->interrupt_is_unwanted));
}
pw->interrupt_generation = am->fa_interrupt_generation;
return 0;
@@ -1505,6 +1499,7 @@ send_one_worker_interrupt (vlib_main_t * vm, acl_main_t *am, int thread_index)
pw->interrupt_is_pending = 1;
vlib_node_set_interrupt_pending (vlib_mains[thread_index],
acl_fa_worker_session_cleaner_process_node.index);
+ elog_acl_maybe_trace_X1(am, "send_one_worker_interrupt: send interrupt to worker %d", "i4", ((u32)thread_index));
/* if the interrupt was requested, mark that done. */
/* pw->interrupt_is_needed = 0; */
}
@@ -1562,9 +1557,8 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
for(tt = 0; tt < vec_len(pw->fa_conn_list_head); tt++) {
u64 head_expiry = acl_fa_get_list_head_expiry_time(am, pw, now, ti, tt);
if ((head_expiry < next_expire) && !pw->interrupt_is_pending) {
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("Head expiry: %lu, now: %lu, next_expire: %lu (worker: %d, tt: %d)", head_expiry, now, next_expire, ti, tt);
-#endif
+ elog_acl_maybe_trace_X3(am, "acl_fa_session_cleaner_process: now %lu, worker: %d tt: %d", "i8i2i2", now, ti, tt);
+ elog_acl_maybe_trace_X2(am, "acl_fa_session_cleaner_process: head expiry: %lu, is earlier than curr next expire: %lu", "i8i8", head_expiry, next_expire);
next_expire = head_expiry;
}
if (~0 != pw->fa_conn_list_head[tt]) {
@@ -1577,6 +1571,7 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
if (!has_pending_conns && (0 == am->fa_total_enabled_count))
{
am->fa_cleaner_cnt_wait_without_timeout++;
+ elog_acl_maybe_trace_X1(am, "acl_conn_cleaner: now %lu entering wait without timeout", "i8", now);
(void) vlib_process_wait_for_event (vm);
event_type = vlib_process_get_events (vm, &event_data);
}
@@ -1591,6 +1586,7 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
else
{
am->fa_cleaner_cnt_wait_with_timeout++;
+ elog_acl_maybe_trace_X2(am, "acl_conn_cleaner: now %lu entering wait with timeout %.6f sec", "i8f8", now, timeout);
(void) vlib_process_wait_for_event_or_clock (vm, timeout);
event_type = vlib_process_get_events (vm, &event_data);
}
@@ -1609,17 +1605,12 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
uword *clear_sw_if_index_bitmap = 0;
uword *sw_if_index0;
int clear_all = 0;
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX received");
-#endif
+ now = clib_cpu_time_now ();
+ elog_acl_maybe_trace_X1(am, "acl_fa_session_cleaner_process: now %lu, received ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX", "i8", now);
vec_foreach (sw_if_index0, event_data)
{
am->fa_cleaner_cnt_delete_by_sw_index++;
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning
- ("ACL_FA_NODE_CLEAN: ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX: %d",
- *sw_if_index0);
-#endif
+ elog_acl_maybe_trace_X1(am, "acl_fa_session_cleaner_process: ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX %d", "i4", *sw_if_index0);
if (*sw_if_index0 == ~0)
{
clear_all = 1;
@@ -1639,9 +1630,7 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
CLIB_MEMORY_BARRIER ();
while (pw0->clear_in_process) {
CLIB_MEMORY_BARRIER ();
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("ACL_FA_NODE_CLEAN: waiting previous cleaning cycle to finish on %d...", pw0 - am->per_worker_data);
-#endif
+ elog_acl_maybe_trace_X1(am, "ACL_FA_NODE_CLEAN: waiting previous cleaning cycle to finish on %d", "i4", (u32)(pw0 - am->per_worker_data));
vlib_process_suspend(vm, 0.0001);
if (pw0->interrupt_is_needed) {
send_one_worker_interrupt(vm, am, (pw0 - am->per_worker_data));
@@ -1673,9 +1662,7 @@ acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
CLIB_MEMORY_BARRIER ();
while (pw0->clear_in_process) {
CLIB_MEMORY_BARRIER ();
-#ifdef FA_NODE_VERBOSE_DEBUG
- clib_warning("ACL_FA_NODE_CLEAN: waiting for my cleaning cycle to finish on %d...", pw0 - am->per_worker_data);
-#endif
+ elog_acl_maybe_trace_X1(am, "ACL_FA_NODE_CLEAN: waiting for my cleaning cycle to finish on %d", "i4", (u32)(pw0 - am->per_worker_data));
vlib_process_suspend(vm, 0.0001);
if (pw0->interrupt_is_needed) {
send_one_worker_interrupt(vm, am, (pw0 - am->per_worker_data));
diff --git a/src/plugins/acl/fa_node.h b/src/plugins/acl/fa_node.h
index 4f2d39b40e4..7ef558e17ea 100644
--- a/src/plugins/acl/fa_node.h
+++ b/src/plugins/acl/fa_node.h
@@ -172,4 +172,121 @@ void show_fa_sessions_hash(vlib_main_t * vm, u32 verbose);
u8 *format_acl_plugin_5tuple (u8 * s, va_list * args);
+/* use like: elog_acl_maybe_trace_X1(am, "foobar: %d", "i4", int32_value); */
+
+#define elog_acl_maybe_trace_X1(am, acl_elog_trace_format_label, acl_elog_trace_format_args, acl_elog_val1) \
+do { \
+ if (am->trace_sessions) { \
+ CLIB_UNUSED(struct { u8 available_space[18 - sizeof(acl_elog_val1)]; } *static_check); \
+ u16 thread_index = os_get_thread_index (); \
+ vlib_worker_thread_t * w = vlib_worker_threads + thread_index; \
+ ELOG_TYPE_DECLARE (e) = \
+ { \
+ .format = "(%02d) " acl_elog_trace_format_label, \
+ .format_args = "i2" acl_elog_trace_format_args, \
+ }; \
+ CLIB_PACKED(struct \
+ { \
+ u16 thread; \
+ typeof(acl_elog_val1) val1; \
+ }) *ed; \
+ ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track); \
+ ed->thread = thread_index; \
+ ed->val1 = acl_elog_val1; \
+ } \
+} while (0)
+
+
+/* use like: elog_acl_maybe_trace_X2(am, "foobar: %d some u64: %lu", "i4i8", int32_value, int64_value); */
+
+#define elog_acl_maybe_trace_X2(am, acl_elog_trace_format_label, acl_elog_trace_format_args, \
+ acl_elog_val1, acl_elog_val2) \
+do { \
+ if (am->trace_sessions) { \
+ CLIB_UNUSED(struct { u8 available_space[18 - sizeof(acl_elog_val1) - sizeof(acl_elog_val2)]; } *static_check); \
+ u16 thread_index = os_get_thread_index (); \
+ vlib_worker_thread_t * w = vlib_worker_threads + thread_index; \
+ ELOG_TYPE_DECLARE (e) = \
+ { \
+ .format = "(%02d) " acl_elog_trace_format_label, \
+ .format_args = "i2" acl_elog_trace_format_args, \
+ }; \
+ CLIB_PACKED(struct \
+ { \
+ u16 thread; \
+ typeof(acl_elog_val1) val1; \
+ typeof(acl_elog_val2) val2; \
+ }) *ed; \
+ ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track); \
+ ed->thread = thread_index; \
+ ed->val1 = acl_elog_val1; \
+ ed->val2 = acl_elog_val2; \
+ } \
+} while (0)
+
+
+/* use like: elog_acl_maybe_trace_X3(am, "foobar: %d some u64 %lu baz: %d", "i4i8i4", int32_value, u64_value, int_value); */
+
+#define elog_acl_maybe_trace_X3(am, acl_elog_trace_format_label, acl_elog_trace_format_args, acl_elog_val1, \
+ acl_elog_val2, acl_elog_val3) \
+do { \
+ if (am->trace_sessions) { \
+ CLIB_UNUSED(struct { u8 available_space[18 - sizeof(acl_elog_val1) - sizeof(acl_elog_val2) \
+ - sizeof(acl_elog_val3)]; } *static_check); \
+ u16 thread_index = os_get_thread_index (); \
+ vlib_worker_thread_t * w = vlib_worker_threads + thread_index; \
+ ELOG_TYPE_DECLARE (e) = \
+ { \
+ .format = "(%02d) " acl_elog_trace_format_label, \
+ .format_args = "i2" acl_elog_trace_format_args, \
+ }; \
+ CLIB_PACKED(struct \
+ { \
+ u16 thread; \
+ typeof(acl_elog_val1) val1; \
+ typeof(acl_elog_val2) val2; \
+ typeof(acl_elog_val3) val3; \
+ }) *ed; \
+ ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track); \
+ ed->thread = thread_index; \
+ ed->val1 = acl_elog_val1; \
+ ed->val2 = acl_elog_val2; \
+ ed->val3 = acl_elog_val3; \
+ } \
+} while (0)
+
+
+/* use like: elog_acl_maybe_trace_X4(am, "foobar: %d some int %d baz: %d bar: %d", "i4i4i4i4", int32_value, int32_value2, int_value, int_value); */
+
+#define elog_acl_maybe_trace_X4(am, acl_elog_trace_format_label, acl_elog_trace_format_args, acl_elog_val1, \
+ acl_elog_val2, acl_elog_val3, acl_elog_val4) \
+do { \
+ if (am->trace_sessions) { \
+ CLIB_UNUSED(struct { u8 available_space[18 - sizeof(acl_elog_val1) - sizeof(acl_elog_val2) \
+ - sizeof(acl_elog_val3) -sizeof(acl_elog_val4)]; } *static_check); \
+ u16 thread_index = os_get_thread_index (); \
+ vlib_worker_thread_t * w = vlib_worker_threads + thread_index; \
+ ELOG_TYPE_DECLARE (e) = \
+ { \
+ .format = "(%02d) " acl_elog_trace_format_label, \
+ .format_args = "i2" acl_elog_trace_format_args, \
+ }; \
+ CLIB_PACKED(struct \
+ { \
+ u16 thread; \
+ typeof(acl_elog_val1) val1; \
+ typeof(acl_elog_val2) val2; \
+ typeof(acl_elog_val3) val3; \
+ typeof(acl_elog_val4) val4; \
+ }) *ed; \
+ ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track); \
+ ed->thread = thread_index; \
+ ed->val1 = acl_elog_val1; \
+ ed->val2 = acl_elog_val2; \
+ ed->val3 = acl_elog_val3; \
+ ed->val4 = acl_elog_val4; \
+ } \
+} while (0)
+
+
#endif