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, 26 insertions, 0 deletions

diff --git a/src/vnet/interface_format.c b/src/vnet/interface_format.c
index 8278102c644..2b691a66071 100644
--- a/src/vnet/interface_format.c
+++ b/src/vnet/interface_format.c
@@ -130,6 +130,26 @@ format_vnet_hw_interface_link_speed (u8 * s, va_list * args)
   return format (s, "%u Kbps", link_speed);
 }
 
+u8 *
+format_vnet_hw_interface_rss_queues (u8 * s, va_list * args)
+{
+  clib_bitmap_t *bitmap = va_arg (*args, clib_bitmap_t *);
+  int i;
+
+  if (bitmap == NULL)
+    return s;
+
+  if (bitmap)
+    {
+    /* *INDENT-OFF* */
+    clib_bitmap_foreach (i, bitmap, ({
+      s = format (s, "%u ", i);
+    }));
+    /* *INDENT-ON* */
+    }
+
+  return s;
+}
 
 u8 *
 format_vnet_hw_interface (u8 * s, va_list * args)
@@ -172,6 +192,12 @@ format_vnet_hw_interface (u8 * s, va_list * args)
   s = format (s, "\n%ULink speed: %U", format_white_space, indent + 2,
 	      format_vnet_hw_interface_link_speed, hi->link_speed);
 
+  if (hi->rss_queues)
+    {
+      s = format (s, "\n%URSS queues: %U", format_white_space, indent + 2,
+		  format_vnet_hw_interface_rss_queues, hi->rss_queues);
+    }
+
   if (verbose)
     {
       if (hw_class->format_device)