vlib: add format_vnet_buffer_no_chain

 - add format_vnet_buffer and format_vnet_buffer_no_chain to mirror
   format_vlib_buffer and format_vlib_buffer_no_chain
 - format_vnet_buffer used to be the "no chain" version, replace all of
   its current use with the corresponding format_vnet_buffer_no_chain
 - add a function to dump vnet buffer details from gdb

Type: improvement

Change-Id: I143ce845f80e7ef937ea33a557b6e3b5988c5b8f
Signed-off-by: Benoît Ganne <bganne@cisco.com>

8 files changed, 36 insertions, 21 deletions

diff --git a/src/plugins/dpdk/device/format.c b/src/plugins/dpdk/device/format.c
index 24994aa9426..71f0d89454b 100644
--- a/src/plugins/dpdk/device/format.c
+++ b/src/plugins/dpdk/device/format.c
@@ -761,9 +761,8 @@ format_dpdk_tx_trace (u8 * s, va_list * va)
   s = format (s, "%U tx queue %d",
 	      format_vnet_sw_interface_name, vnm, sw, t->queue_index);
 
-  s = format (s, "\n%Ubuffer 0x%x: %U",
-	      format_white_space, indent,
-	      t->buffer_index, format_vnet_buffer, &t->buffer);
+  s = format (s, "\n%Ubuffer 0x%x: %U", format_white_space, indent,
+	      t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
 
   s = format (s, "\n%U%U",
 	      format_white_space, indent,
@@ -792,9 +791,8 @@ format_dpdk_rx_trace (u8 * s, va_list * va)
   s = format (s, "%U rx queue %d",
 	      format_vnet_sw_interface_name, vnm, sw, t->queue_index);
 
-  s = format (s, "\n%Ubuffer 0x%x: %U",
-	      format_white_space, indent,
-	      t->buffer_index, format_vnet_buffer, &t->buffer);
+  s = format (s, "\n%Ubuffer 0x%x: %U", format_white_space, indent,
+	      t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
 
   s = format (s, "\n%U%U",
 	      format_white_space, indent,
diff --git a/src/plugins/vmxnet3/format.c b/src/plugins/vmxnet3/format.c
index d463feb3bec..43d790d31eb 100644
--- a/src/plugins/vmxnet3/format.c
+++ b/src/plugins/vmxnet3/format.c
@@ -164,7 +164,7 @@ format_vmxnet3_input_trace (u8 * s, va_list * args)
   s = format (s, "vmxnet3: %v (%d) next-node %U",
 	      hi->name, t->hw_if_index, format_vlib_next_node_name, vm,
 	      node->index, t->next_index);
-  s = format (s, "\n  buffer %U", format_vnet_buffer, &t->buffer);
+  s = format (s, "\n  buffer %U", format_vnet_buffer_no_chain, &t->buffer);
 
   return s;
 }
diff --git a/src/vnet/buffer.c b/src/vnet/buffer.c
index ef93185b2c1..721f856ddda 100644
--- a/src/vnet/buffer.c
+++ b/src/vnet/buffer.c
@@ -37,10 +37,9 @@ format_vnet_buffer_offload (u8 *s, va_list *args)
     return s;
 }
 
-u8 *
-format_vnet_buffer (u8 * s, va_list * args)
+static u8 *
+format_vnet_buffer_internal (u8 *s, vlib_buffer_t *b, int no_chain)
 {
-  vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
   u32 indent = format_get_indent (s);
   u8 *a = 0;
 
@@ -72,7 +71,8 @@ format_vnet_buffer (u8 * s, va_list * args)
   if (b->flags & VNET_BUFFER_F_LOOP_COUNTER_VALID)
     a = format (a, "loop-counter %d ", vnet_buffer2 (b)->loop_counter);
 
-  s = format (s, "%U", format_vlib_buffer_no_chain, b);
+  s = format (s, "%U",
+	      no_chain ? format_vlib_buffer_no_chain : format_vlib_buffer, b);
   if (a)
     s = format (s, "\n%U%v", format_white_space, indent, a);
   vec_free (a);
@@ -80,6 +80,19 @@ format_vnet_buffer (u8 * s, va_list * args)
   return s;
 }
 
+u8 *
+format_vnet_buffer_no_chain (u8 *s, va_list *args)
+{
+  vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
+  return format_vnet_buffer_internal (s, b, 1 /* no_chain */);
+}
+
+u8 *
+format_vnet_buffer (u8 *s, va_list *args)
+{
+  vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
+  return format_vnet_buffer_internal (s, b, 0 /* no_chain */);
+}
 
 /*
  * fd.io coding-style-patch-verification: ON
diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index 600782c3864..cbaf4d84e42 100644
--- a/src/vnet/buffer.h
+++ b/src/vnet/buffer.h
@@ -517,7 +517,7 @@ STATIC_ASSERT (sizeof (vnet_buffer_opaque2_t) <=
                        vnet_buffer(b)->l4_hdr_offset - \
                        vnet_buffer (b)->l3_hdr_offset)
 
-
+format_function_t format_vnet_buffer_no_chain;
 format_function_t format_vnet_buffer;
 format_function_t format_vnet_buffer_offload;
 format_function_t format_vnet_buffer_flags;
diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
index aa816e2e17d..6c2fe34abf0 100644
--- a/src/vnet/devices/virtio/device.c
+++ b/src/vnet/devices/virtio/device.c
@@ -88,9 +88,8 @@ format_virtio_tx_trace (u8 * s, va_list * va)
   virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
   u32 indent = format_get_indent (s);
 
-  s = format (s, "%Ubuffer 0x%x: %U\n",
-	      format_white_space, indent,
-	      t->buffer_index, format_vnet_buffer, &t->buffer);
+  s = format (s, "%Ubuffer 0x%x: %U\n", format_white_space, indent,
+	      t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
   s =
     format (s, "%U%U\n", format_white_space, indent,
 	    format_generic_header_offset, &t->gho);
diff --git a/src/vnet/pg/input.c b/src/vnet/pg/input.c
index 98db46abd6a..17b7c518385 100644
--- a/src/vnet/pg/input.c
+++ b/src/vnet/pg/input.c
@@ -78,7 +78,7 @@ validate_buffer_data2 (vlib_buffer_t * b, pg_stream_t * s,
   if (i >= n_bytes)
     return 1;
 
-  clib_warning ("buffer %U", format_vnet_buffer, b);
+  clib_warning ("buffer %U", format_vnet_buffer_no_chain, b);
   clib_warning ("differ at index %d", i);
   clib_warning ("is     %U", format_hex_bytes, bd, n_bytes);
   clib_warning ("mask   %U", format_hex_bytes, pm, n_bytes);
@@ -1435,8 +1435,8 @@ format_pg_input_trace (u8 * s, va_list * va)
   s = format (s, ", %d bytes", t->packet_length);
   s = format (s, ", sw_if_index %d", t->sw_if_index);
 
-  s = format (s, "\n%U%U",
-	      format_white_space, indent, format_vnet_buffer, &t->buffer);
+  s = format (s, "\n%U%U", format_white_space, indent,
+	      format_vnet_buffer_no_chain, &t->buffer);
 
   s = format (s, "\n%U", format_white_space, indent);
 
diff --git a/src/vnet/pg/stream.c b/src/vnet/pg/stream.c
index 686627b8d9a..605567c1296 100644
--- a/src/vnet/pg/stream.c
+++ b/src/vnet/pg/stream.c
@@ -102,9 +102,8 @@ format_pg_output_trace (u8 * s, va_list * va)
   pg_output_trace_t *t = va_arg (*va, pg_output_trace_t *);
   u32 indent = format_get_indent (s);
 
-  s = format (s, "%Ubuffer 0x%x: %U",
-	      format_white_space, indent,
-	      t->buffer_index, format_vnet_buffer, &t->buffer);
+  s = format (s, "%Ubuffer 0x%x: %U", format_white_space, indent,
+	      t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
 
   s = format (s, "\n%U%U", format_white_space, indent,
 	      format_ethernet_header_with_length, t->buffer.pre_data,
diff --git a/src/vnet/unix/gdb_funcs.c b/src/vnet/unix/gdb_funcs.c
index 886d849c173..91dabe394ba 100644
--- a/src/vnet/unix/gdb_funcs.c
+++ b/src/vnet/unix/gdb_funcs.c
@@ -421,6 +421,12 @@ gdb_dump_trajectory_trace (u32 bi)
 #endif
 }
 
+void
+gdb_dump_buffer (vlib_buffer_t *b)
+{
+  fformat (stderr, "%U\n", format_vnet_buffer, b);
+}
+
 /* Cafeteria plan, maybe you don't want these functions */
 clib_error_t *
 gdb_func_init (vlib_main_t * vm)