SPAN:add l2 mirror

added span feature nodes for l2-input / l2-output

Change-Id: Ib6e0ce60d0811901b6edd70209e6a4c4a35cd8ff
Signed-off-by: Eyal Bari <ebari@cisco.com>

1 files changed, 86 insertions, 62 deletions

diff --git a/src/vnet/span/span.c b/src/vnet/span/span.c
index c5b43e34..6ecd1789 100644
--- a/src/vnet/span/span.c
+++ b/src/vnet/span/span.c
@@ -16,60 +16,81 @@
 #include <vlib/vlib.h>
 #include <vppinfra/error.h>
 #include <vnet/feature/feature.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/l2_output.h>
 
 #include <vnet/span/span.h>
 
+typedef enum
+{
+  SPAN_DISABLE = 0,
+  SPAN_RX = 1,
+  SPAN_TX = 2,
+  SPAN_BOTH = SPAN_RX | SPAN_TX
+} span_state_t;
+
+static_always_inline u32
+span_dst_set (span_mirror_t * sm, u32 dst_sw_if_index, int enable)
+{
+  sm->mirror_ports =
+    clib_bitmap_set (sm->mirror_ports, dst_sw_if_index, enable);
+  u32 last = sm->num_mirror_ports;
+  sm->num_mirror_ports = clib_bitmap_count_set_bits (sm->mirror_ports);
+  return last;
+}
+
 int
 span_add_delete_entry (vlib_main_t * vm,
-		       u32 src_sw_if_index, u32 dst_sw_if_index, u8 state)
+		       u32 src_sw_if_index, u32 dst_sw_if_index, u8 state,
+		       span_feat_t sf)
 {
   span_main_t *sm = &span_main;
-  span_interface_t *si;
-  u32 new_num_rx_mirror_ports, new_num_tx_mirror_ports;
 
-  if (state > 3)
+  if (state > SPAN_BOTH)
     return VNET_API_ERROR_UNIMPLEMENTED;
 
   if ((src_sw_if_index == ~0) || (dst_sw_if_index == ~0 && state > 0)
       || (src_sw_if_index == dst_sw_if_index))
     return VNET_API_ERROR_INVALID_INTERFACE;
 
-  vnet_sw_interface_t *sw_if;
-
-  sw_if = vnet_get_sw_interface (vnet_get_main (), src_sw_if_index);
-  if (sw_if->type == VNET_SW_INTERFACE_TYPE_SUB)
-    return VNET_API_ERROR_UNIMPLEMENTED;
-
   vec_validate_aligned (sm->interfaces, src_sw_if_index,
 			CLIB_CACHE_LINE_BYTES);
-  si = vec_elt_at_index (sm->interfaces, src_sw_if_index);
-
-  si->rx_mirror_ports = clib_bitmap_set (si->rx_mirror_ports, dst_sw_if_index,
-					 (state & 1) != 0);
-  si->tx_mirror_ports = clib_bitmap_set (si->tx_mirror_ports, dst_sw_if_index,
-					 (state & 2) != 0);
 
-  new_num_rx_mirror_ports = clib_bitmap_count_set_bits (si->rx_mirror_ports);
-  new_num_tx_mirror_ports = clib_bitmap_count_set_bits (si->tx_mirror_ports);
+  span_interface_t *si = vec_elt_at_index (sm->interfaces, src_sw_if_index);
 
-  if (new_num_rx_mirror_ports == 1 && si->num_rx_mirror_ports == 0)
-    vnet_feature_enable_disable ("device-input", "span-input",
-				 src_sw_if_index, 1, 0, 0);
+  int rx = ! !(state & SPAN_RX);
+  int tx = ! !(state & SPAN_TX);
 
-  if (new_num_rx_mirror_ports == 0 && si->num_rx_mirror_ports == 1)
-    vnet_feature_enable_disable ("device-input", "span-input",
-				 src_sw_if_index, 0, 0, 0);
+  span_mirror_t *rxm = &si->mirror_rxtx[sf][VLIB_RX];
+  span_mirror_t *txm = &si->mirror_rxtx[sf][VLIB_TX];
 
-  if (new_num_rx_mirror_ports == 1 && si->num_rx_mirror_ports == 0)
-    vnet_feature_enable_disable ("interface-output", "span-output",
-				 src_sw_if_index, 1, 0, 0);
+  u32 last_rx_ports_count = span_dst_set (rxm, dst_sw_if_index, rx);
+  u32 last_tx_ports_count = span_dst_set (txm, dst_sw_if_index, tx);
 
-  if (new_num_rx_mirror_ports == 0 && si->num_rx_mirror_ports == 1)
-    vnet_feature_enable_disable ("interface-output", "span-output",
-				 src_sw_if_index, 0, 0, 0);
+  int enable_rx = last_rx_ports_count == 0 && rxm->num_mirror_ports == 1;
+  int disable_rx = last_rx_ports_count == 1 && rxm->num_mirror_ports == 0;
+  int enable_tx = last_tx_ports_count == 0 && txm->num_mirror_ports == 1;
+  int disable_tx = last_tx_ports_count == 1 && txm->num_mirror_ports == 0;
 
-  si->num_rx_mirror_ports = new_num_rx_mirror_ports;
-  si->num_tx_mirror_ports = new_num_tx_mirror_ports;
+  switch (sf)
+    {
+    case SPAN_FEAT_DEVICE:
+      if (enable_rx || disable_rx)
+	vnet_feature_enable_disable ("device-input", "span-input",
+				     src_sw_if_index, rx, 0, 0);
+      if (enable_tx || disable_tx)
+	vnet_feature_enable_disable ("interface-output", "span-output",
+				     src_sw_if_index, tx, 0, 0);
+      break;
+    case SPAN_FEAT_L2:
+      if (enable_rx || disable_rx)
+	l2input_intf_bitmap_enable (src_sw_if_index, L2INPUT_FEAT_SPAN, rx);
+      if (enable_tx || disable_tx)
+	l2output_intf_bitmap_enable (src_sw_if_index, L2OUTPUT_FEAT_SPAN, tx);
+      break;
+    default:
+      return VNET_API_ERROR_UNIMPLEMENTED;
+    }
 
   if (dst_sw_if_index > sm->max_sw_if_index)
     sm->max_sw_if_index = dst_sw_if_index;
@@ -85,7 +106,8 @@ set_interface_span_command_fn (vlib_main_t * vm,
   span_main_t *sm = &span_main;
   u32 src_sw_if_index = ~0;
   u32 dst_sw_if_index = ~0;
-  u8 state = 3;
+  u8 state = SPAN_BOTH;
+  span_feat_t sf = SPAN_FEAT_DEVICE;
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
@@ -96,19 +118,21 @@ set_interface_span_command_fn (vlib_main_t * vm,
 			 sm->vnet_main, &dst_sw_if_index))
 	;
       else if (unformat (input, "disable"))
-	state = 0;
+	state = SPAN_DISABLE;
       else if (unformat (input, "rx"))
-	state = 1;
+	state = SPAN_RX;
       else if (unformat (input, "tx"))
-	state = 2;
+	state = SPAN_TX;
       else if (unformat (input, "both"))
-	state = 3;
+	state = SPAN_BOTH;
+      else if (unformat (input, "l2"))
+	sf = SPAN_FEAT_L2;
       else
 	break;
     }
 
   int rv =
-    span_add_delete_entry (vm, src_sw_if_index, dst_sw_if_index, state);
+    span_add_delete_entry (vm, src_sw_if_index, dst_sw_if_index, state, sf);
   if (rv == VNET_API_ERROR_INVALID_INTERFACE)
     return clib_error_return (0, "Invalid interface");
   return 0;
@@ -117,7 +141,7 @@ set_interface_span_command_fn (vlib_main_t * vm,
 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (set_interface_span_command, static) = {
   .path = "set interface span",
-  .short_help = "set interface span <if-name> [disable | destination <if-name> [both|rx|tx]]",
+  .short_help = "set interface span <if-name> [l2] {disable | destination <if-name> [both|rx|tx]}",
   .function = set_interface_span_command_fn,
 };
 /* *INDENT-ON* */
@@ -136,31 +160,44 @@ show_interfaces_span_command_fn (vlib_main_t * vm,
 
   /* *INDENT-OFF* */
   vec_foreach (si, sm->interfaces)
-    if (si->num_rx_mirror_ports || si->num_tx_mirror_ports)
+  {
+  span_mirror_t * drxm = &si->mirror_rxtx[SPAN_FEAT_DEVICE][VLIB_RX];
+  span_mirror_t * dtxm = &si->mirror_rxtx[SPAN_FEAT_DEVICE][VLIB_TX];
+
+  span_mirror_t * lrxm = &si->mirror_rxtx[SPAN_FEAT_L2][VLIB_RX];
+  span_mirror_t * ltxm = &si->mirror_rxtx[SPAN_FEAT_L2][VLIB_TX];
+
+    if (drxm->num_mirror_ports || dtxm->num_mirror_ports ||
+        lrxm->num_mirror_ports || ltxm->num_mirror_ports)
       {
-	clib_bitmap_t *b;
 	u32 i;
-	b = clib_bitmap_dup_or (si->rx_mirror_ports, si->tx_mirror_ports);
+	clib_bitmap_t *d = clib_bitmap_dup_or (drxm->mirror_ports, dtxm->mirror_ports);
+	clib_bitmap_t *l = clib_bitmap_dup_or (lrxm->mirror_ports, ltxm->mirror_ports);
+	clib_bitmap_t *b = clib_bitmap_dup_or (d, l);
 	if (header)
 	  {
-	    vlib_cli_output (vm, "%-40s %s", "Source interface",
-			     "Mirror interface (direction)");
+	    vlib_cli_output (vm, "%-20s %-20s  %6s   %6s", "Source", "Destination",
+			     "Device", "L2");
 	    header = 0;
 	  }
 	s = format (s, "%U", format_vnet_sw_if_index_name, vnm,
 		    si - sm->interfaces);
 	clib_bitmap_foreach (i, b, (
 	  {
-	    int state;
-	    state = (clib_bitmap_get (si->rx_mirror_ports, i) +
-		     clib_bitmap_get (si->tx_mirror_ports, i) * 2);
+	    int device = (clib_bitmap_get (drxm->mirror_ports, i) +
+		         clib_bitmap_get (dtxm->mirror_ports, i) * 2);
+	    int l2 = (clib_bitmap_get (lrxm->mirror_ports, i) +
+		      clib_bitmap_get (ltxm->mirror_ports, i) * 2);
 
-	    vlib_cli_output (vm, "%-40v %U (%s)", s,
+	    vlib_cli_output (vm, "%-20v %-20U (%6s) (%6s)", s,
 			     format_vnet_sw_if_index_name, vnm, i,
-			     states[state]);
+			     states[device], states[l2]);
 	    vec_reset_length (s);
 	  }));
 	clib_bitmap_free (b);
+	clib_bitmap_free (l);
+	clib_bitmap_free (d);
+      }
       }
   /* *INDENT-ON* */
   vec_free (s);
@@ -175,19 +212,6 @@ VLIB_CLI_COMMAND (show_interfaces_span_command, static) = {
 };
 /* *INDENT-ON* */
 
-static clib_error_t *
-span_init (vlib_main_t * vm)
-{
-  span_main_t *sm = &span_main;
-
-  sm->vlib_main = vm;
-  sm->vnet_main = vnet_get_main ();
-
-  return 0;
-}
-
-VLIB_INIT_FUNCTION (span_init);
-
 /*
  * fd.io coding-style-patch-verification: ON
  *