interface: support configuring RSS steering queues

This patch adds the RSS steering queues set interface, and it's
implementation in DPDK device:

/* Interface to set rss queues of the interface */
typedef clib_error_t *(vnet_interface_rss_queues_set_t)
  (struct vnet_main_t * vnm, struct vnet_hw_interface_t * hi,
   clib_bitmap_t *bitmap);

This patch also introduces a command line to set the RSS queues:
  set interface rss queues <interface> <list <queue-list>>
To display the rss queues, use "show hardware-interfaces"

Below is the example to configure rss queues for interface Gig0:
vpp# set interface rss queues Gig0 list 0,2,4-7
vpp# show hardware-interfaces brief
              Name                Idx   Link  Hardware
VirtualFunctionEthernet18/1/0      1    down  VirtualFunctionEthernet18/1/0
  Link speed: unknown
  RSS queues: 0 2 4 5 6 7
local0                             0    down  local0
  Link speed: unknown
vpp#

Users can also configure the rss queues on a dpdk interface in
startup.conf:
dpdk {
    dev 0000:18:01.0 {
        rss-queues 0,2,5-7
    }
}

Type: feature

Signed-off-by: Chenmin Sun <chenmin.sun@intel.com>
Change-Id: I1835595a1c54016a84eabee9fd62ce137935385d

1 files changed, 83 insertions, 0 deletions

diff --git a/src/vnet/interface_cli.c b/src/vnet/interface_cli.c
index bee813f5874..28f24ae3977 100644
--- a/src/vnet/interface_cli.c
+++ b/src/vnet/interface_cli.c
@@ -1886,6 +1886,89 @@ VLIB_CLI_COMMAND (cmd_set_if_rx_placement,static) = {
 };
 /* *INDENT-ON* */
 
+clib_error_t *
+set_interface_rss_queues (vlib_main_t * vm, u32 hw_if_index,
+			  clib_bitmap_t * bitmap)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+  return vnet_hw_interface_set_rss_queues (vnm, hi, bitmap);
+}
+
+static clib_error_t *
+set_interface_rss_queues_fn (vlib_main_t * vm,
+			     unformat_input_t * input,
+			     vlib_cli_command_t * cmd)
+{
+  clib_error_t *error = 0;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  vnet_main_t *vnm = vnet_get_main ();
+  u32 hw_if_index = (u32) ~ 0;
+  clib_bitmap_t *bitmap = NULL;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat
+	  (line_input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index))
+	;
+      else
+	if (unformat (line_input, "list %U", unformat_bitmap_list, &bitmap))
+	;
+      else
+	{
+	  error = clib_error_return (0, "parse error: '%U'",
+				     format_unformat_error, line_input);
+	  unformat_free (line_input);
+	  goto done;
+	}
+    }
+
+  unformat_free (line_input);
+
+  if (hw_if_index == (u32) ~ 0)
+    {
+      error = clib_error_return (0, "please specify valid interface name");
+      goto done;
+    }
+
+  if (bitmap == NULL)
+    {
+      error = clib_error_return (0, "please specify the valid rss queues");
+      goto done;
+    }
+
+  error = set_interface_rss_queues (vm, hw_if_index, bitmap);
+
+done:
+  if (bitmap)
+    clib_bitmap_free (bitmap);
+
+  return (error);
+}
+
+/*?
+ * This command is used to set the rss queues of a given interface
+ * Not all the interfaces support this operation.
+ * To display the current rss queues, use the command
+ * '<em>show hardware-interfaces</em>'.
+ *
+ * @cliexpar
+ * Example of how to set the rss queues to 0,2-5,7 of an interface:
+ * @cliexstart{set interface rss queues VirtualFunctionEthernet18/1/0 list 0,2-5,7}
+ * @cliexend
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (cmd_set_interface_rss_queues,static) = {
+    .path = "set interface rss queues",
+    .short_help = "set interface rss queues <interface> <list <queue-list>>",
+    .function = set_interface_rss_queues_fn,
+};
+/* *INDENT-ON* */
+
 static u8 *
 format_vnet_pcap (u8 * s, va_list * args)
 {