dpdk: add support to disable interrupt mode

Type: improvement

Change-Id: I4864dc2af808aa76ecbc9ade0e86e1a781e6b704
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

src/plugins/dpdk/device/dpdk.h

@@ -241,6 +241,7 @@ typedef struct
   _ (num_rx_desc)                                                             \
   _ (num_tx_desc)                                                             \
   _ (max_lro_pkt_size)                                                        \
+  _ (disable_rxq_int)                                                         \
   _ (rss_fn)
 
 typedef enum

src/plugins/dpdk/device/init.c

@@ -588,6 +588,9 @@ dpdk_lib_init (dpdk_main_t * dm)
       if (devconf->max_lro_pkt_size)
 	xd->conf.max_lro_pkt_size = devconf->max_lro_pkt_size;
 
+      if (devconf->disable_rxq_int)
+	xd->conf.enable_rxq_int = 0;
+
       dpdk_device_setup (xd);
 
       /* rss queues should be configured after dpdk_device_setup() */
@@ -1006,6 +1009,10 @@ dpdk_device_config (dpdk_config_main_t *conf, void *addr,
 	  if (error)
 	    break;
 	}
+      else if (unformat (input, "no-rx-interrupts"))
+	{
+	  devconf->disable_rxq_int = 1;
+	}
       else if (unformat (input, "tso on"))
 	{
 	  devconf->tso = DPDK_DEVICE_TSO_ON;

src/vpp/conf/startup.conf

@@ -164,6 +164,11 @@ cpu {
 	#	num-rx-queues 2
 	# }
 
+	## Set interface only in poll mode
+        # dev 0000:02:00.1 {
+        #       no-rx-interrupts
+        # }
+
 	## Change UIO driver used by VPP, Options are: igb_uio, vfio-pci,
 	## uio_pci_generic or auto (default)
 	# uio-driver vfio-pci