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authorVladislav Grishenko <themiron@yandex-team.ru>2021-07-10 04:02:46 +0500
committerDamjan Marion <dmarion@0xa5.net>2023-03-06 17:47:26 +0000
commitff2fba7264cf077fc83ef2192013b7135e4f83f1 (patch)
treec6782ce295c4956acbbf3f0896ad9c38aa844e76
parent8181727ee518d46ac2f45b769e273431211257a6 (diff)
vlib: avoid non-mp-safe cli process node updates
Node renames, clone and node_by_name hash updates should be done in vlib_node_register() / vlib_node_rename() under barrier, or else runtime per-node stats can be either inaccurate or lead to UB. Drop cli process nodes renaming rather than adding barrier syncronization on reuse, nodes will get "unix-cli-process-ID" stable names, description and terminal names are preserved and can be obtained with "show cli-sessions" and "show terminal" commands. Also fix insufficient name width for "show cli-sessions" with table formatting, output sample: DBGvpp# sh cli-sessions PNI FD Name Flags 708 14 unix-cli-local:10558 iSLpa 710 15 unix-cli-127.0.0.1:33252 ISlpA DBGvpp# sh terminal Terminal name: unix-cli-127.0.0.1:33252 Terminal node: unix-cli-process-1 Terminal mode: char-by-char Terminal width: 158 Terminal height: 43 ANSI capable: yes Interactive: yes History enabled: yes History limit: 50 Pager enabled: yes Pager limit: 100000 CRLF mode: CR+LF Type: improvement Signed-off-by: Vladislav Grishenko <themiron@yandex-team.ru> Change-Id: I40af4c0a5e5be92d5e3ebcd440fa55390aeb0e8b
-rw-r--r--src/vlib/unix/cli.c90
1 files changed, 34 insertions, 56 deletions
diff --git a/src/vlib/unix/cli.c b/src/vlib/unix/cli.c
index a647dd78250..cb13e0f09fa 100644
--- a/src/vlib/unix/cli.c
+++ b/src/vlib/unix/cli.c
@@ -62,6 +62,7 @@
#include <netinet/tcp.h>
#include <math.h>
#include <vppinfra/macros.h>
+#include <vppinfra/format_table.h>
/** ANSI escape code. */
#define ESC "\x1b"
@@ -244,6 +245,9 @@ typedef struct
/** Macro tables for this session */
clib_macro_main_t macro_main;
+
+ /** Session name */
+ u8 *name;
} unix_cli_file_t;
/** Resets the pager buffer and other data.
@@ -275,6 +279,7 @@ unix_cli_file_free (unix_cli_file_t * f)
{
vec_free (f->output_vector);
vec_free (f->input_vector);
+ vec_free (f->name);
unix_cli_pager_reset (f);
}
@@ -2877,47 +2882,16 @@ unix_cli_file_add (unix_cli_main_t * cm, char *name, int fd)
{
unix_main_t *um = &unix_main;
clib_file_main_t *fm = &file_main;
- vlib_node_main_t *nm = &vlib_get_main ()->node_main;
unix_cli_file_t *cf;
clib_file_t template = { 0 };
vlib_main_t *vm = um->vlib_main;
vlib_node_t *n = 0;
- u8 *file_desc = 0;
-
- file_desc = format (0, "%s", name);
-
- name = (char *) format (0, "unix-cli-%s", name);
if (vec_len (cm->unused_cli_process_node_indices) > 0)
{
- uword l = vec_len (cm->unused_cli_process_node_indices);
- int i;
- vlib_main_t *this_vlib_main;
- u8 *old_name = 0;
-
- /*
- * Nodes are bulk-copied, so node name pointers are shared.
- * Find the cli node in all graph replicas, and give all of them
- * the same new name.
- * Then, throw away the old shared name-vector.
- */
- for (i = 0; i < vlib_get_n_threads (); i++)
- {
- this_vlib_main = vlib_get_main_by_index (i);
- if (this_vlib_main == 0)
- continue;
- n = vlib_get_node (this_vlib_main,
- cm->unused_cli_process_node_indices[l - 1]);
- old_name = n->name;
- n->name = (u8 *) name;
- }
- ASSERT (old_name);
- hash_unset (nm->node_by_name, old_name);
- hash_set (nm->node_by_name, name, n->index);
- vec_free (old_name);
+ n = vlib_get_node (vm, vec_pop (cm->unused_cli_process_node_indices));
vlib_node_set_state (vm, n->index, VLIB_NODE_STATE_POLLING);
- vec_set_len (cm->unused_cli_process_node_indices, l - 1);
}
else
{
@@ -2926,19 +2900,18 @@ unix_cli_file_add (unix_cli_main_t * cm, char *name, int fd)
.type = VLIB_NODE_TYPE_PROCESS,
.process_log2_n_stack_bytes = 18,
};
+ static u32 count = 0;
vlib_worker_thread_barrier_sync (vm);
- vlib_register_node (vm, &r, "%v", name);
- vec_free (name);
+ vlib_register_node (vm, &r, "unix-cli-process-%u", count++);
n = vlib_get_node (vm, r.index);
vlib_worker_thread_node_runtime_update ();
vlib_worker_thread_barrier_release (vm);
}
- pool_get (cm->cli_file_pool, cf);
- clib_memset (cf, 0, sizeof (*cf));
+ pool_get_zero (cm->cli_file_pool, cf);
clib_macro_init (&cf->macro_main);
template.read_function = unix_cli_read_ready;
@@ -2946,8 +2919,9 @@ unix_cli_file_add (unix_cli_main_t * cm, char *name, int fd)
template.error_function = unix_cli_error_detected;
template.file_descriptor = fd;
template.private_data = cf - cm->cli_file_pool;
- template.description = file_desc;
+ template.description = format (0, "%s", name);
+ cf->name = format (0, "unix-cli-%s", name);
cf->process_node_index = n->index;
cf->clib_file_index = clib_file_add (fm, &template);
cf->output_vector = 0;
@@ -3671,7 +3645,8 @@ unix_cli_show_terminal (vlib_main_t * vm,
n = vlib_get_node (vm, cf->process_node_index);
- vlib_cli_output (vm, "Terminal name: %v\n", n->name);
+ vlib_cli_output (vm, "Terminal name: %v\n", cf->name);
+ vlib_cli_output (vm, "Terminal node: %v\n", n->name);
vlib_cli_output (vm, "Terminal mode: %s\n", cf->line_mode ?
"line-by-line" : "char-by-char");
vlib_cli_output (vm, "Terminal width: %d\n", cf->width);
@@ -3736,31 +3711,34 @@ unix_cli_show_cli_sessions (vlib_main_t * vm,
{
unix_cli_main_t *cm = &unix_cli_main;
clib_file_main_t *fm = &file_main;
+ table_t table = {}, *t = &table;
unix_cli_file_t *cf;
clib_file_t *uf;
- vlib_node_t *n;
- vlib_cli_output (vm, "%-5s %-5s %-20s %s", "PNI", "FD", "Name", "Flags");
+ table_add_header_col (t, 4, "PNI ", "FD ", "Name", "Flags");
#define fl(x, y) ( (x) ? toupper((y)) : tolower((y)) )
- /* *INDENT-OFF* */
- pool_foreach (cf, cm->cli_file_pool) {
- uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
- n = vlib_get_node (vm, cf->process_node_index);
- vlib_cli_output (vm,
- "%-5d %-5d %-20v %c%c%c%c%c\n",
- cf->process_node_index,
- uf->file_descriptor,
- n->name,
- fl (cf->is_interactive, 'i'),
- fl (cf->is_socket, 's'),
- fl (cf->line_mode, 'l'),
- fl (cf->has_epipe, 'p'),
- fl (cf->ansi_capable, 'a'));
- }
- /* *INDENT-ON* */
+ int i = 0;
+ pool_foreach (cf, cm->cli_file_pool)
+ {
+ int j = 0;
+
+ uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
+ table_format_cell (t, i, j++, "%u", cf->process_node_index);
+ table_format_cell (t, i, j++, "%u", uf->file_descriptor);
+ table_format_cell (t, i, j++, "%v", cf->name);
+ table_format_cell (t, i++, j++, "%c%c%c%c%c",
+ fl (cf->is_interactive, 'i'), fl (cf->is_socket, 's'),
+ fl (cf->line_mode, 'l'), fl (cf->has_epipe, 'p'),
+ fl (cf->ansi_capable, 'a'));
+ }
#undef fl
+ t->default_body.align = TTAA_LEFT;
+ t->default_header_col.align = TTAA_LEFT;
+ vlib_cli_output (vm, "%U", format_table, t);
+ table_free (t);
+
return 0;
}