dpdk: implement interrupt mode

Change-Id: I6ababc99ecf559327a4370914580c98d32680175
Type: feature
Signed-off-by: Mohammed Hawari <mohammed@hawari.fr>

1 files changed, 77 insertions, 0 deletions

diff --git a/src/plugins/dpdk/device/common.c b/src/plugins/dpdk/device/common.c
index e9b033ec1af..a837714e75b 100644
--- a/src/plugins/dpdk/device/common.c
+++ b/src/plugins/dpdk/device/common.c
@@ -16,6 +16,8 @@
 #include <vnet/vnet.h>
 #include <vppinfra/vec.h>
 #include <vppinfra/format.h>
+#include <vppinfra/file.h>
+#include <vlib/unix/unix.h>
 #include <assert.h>
 
 #include <vnet/ip/ip.h>
@@ -160,6 +162,79 @@ error:
   sw->flags |= VNET_SW_INTERFACE_FLAG_ERROR;
 }
 
+static clib_error_t *
+dpdk_rx_read_ready (clib_file_t *uf)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  dpdk_main_t *dm = &dpdk_main;
+  u32 qidx = uf->private_data;
+  vnet_hw_if_rx_queue_t *rxq = vnet_hw_if_get_rx_queue (vnm, qidx);
+  dpdk_device_t *xd = vec_elt_at_index (dm->devices, rxq->dev_instance);
+
+  u64 b;
+  CLIB_UNUSED (ssize_t size) = read (uf->file_descriptor, &b, sizeof (b));
+  if (rxq->mode != VNET_HW_IF_RX_MODE_POLLING)
+    {
+      vnet_hw_if_rx_queue_set_int_pending (vnm, uf->private_data);
+      rte_eth_dev_rx_intr_enable (xd->port_id, rxq->queue_id);
+    }
+
+  return 0;
+}
+
+static void
+dpdk_setup_interrupts (dpdk_device_t *xd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, xd->hw_if_index);
+  if (!hi)
+    return;
+
+  if (!xd->port_conf.intr_conf.rxq)
+    return;
+
+  /* Probe for interrupt support */
+  if (rte_eth_dev_rx_intr_enable (xd->port_id, 0))
+    {
+      dpdk_log_info ("probe for interrupt mode for device %U. Failed.\n",
+		     format_dpdk_device_name, xd->port_id);
+    }
+  else
+    {
+      xd->flags |= DPDK_DEVICE_FLAG_INT_SUPPORTED;
+      rte_eth_dev_rx_intr_disable (xd->port_id, 0);
+      dpdk_log_info ("Probe for interrupt mode for device %U. Success.\n",
+		     format_dpdk_device_name, xd->port_id);
+    }
+
+  if (xd->flags & DPDK_DEVICE_FLAG_INT_SUPPORTED)
+    {
+      hi->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+      for (int q = 0; q < xd->rx_q_used; q++)
+	{
+	  dpdk_rx_queue_t *rxq = vec_elt_at_index (xd->rx_queues, q);
+	  clib_file_t f = { 0 };
+	  rxq->efd = rte_eth_dev_rx_intr_ctl_q_get_fd (xd->port_id, q);
+	  if (rxq->efd < 0)
+	    {
+	      xd->flags &= ~DPDK_DEVICE_FLAG_INT_SUPPORTED;
+	      hi->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+	      break;
+	    }
+	  f.read_function = dpdk_rx_read_ready;
+	  f.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
+	  f.file_descriptor = rxq->efd;
+	  f.private_data = rxq->queue_index;
+	  f.description =
+	    format (0, "%U queue %u", format_dpdk_device_name, xd->port_id, q);
+	  rxq->clib_file_index = clib_file_add (&file_main, &f);
+	  vnet_hw_if_set_rx_queue_file_index (vnm, rxq->queue_index,
+					      rxq->clib_file_index);
+	}
+    }
+  vnet_hw_if_update_runtime_data (vnm, xd->hw_if_index);
+}
+
 void
 dpdk_device_start (dpdk_device_t * xd)
 {
@@ -176,6 +251,8 @@ dpdk_device_start (dpdk_device_t * xd)
       return;
     }
 
+  dpdk_setup_interrupts (xd);
+
   if (xd->default_mac_address)
     rv = rte_eth_dev_default_mac_addr_set (xd->port_id,
 					   (void *) xd->default_mac_address);