virtio: Add gso support for native virtio driver

Change-Id: I7b735f5a540e8c278bac88245acb3f8c041c49c0
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

5 files changed, 77 insertions, 7 deletions

diff --git a/src/vnet/devices/virtio/cli.c b/src/vnet/devices/virtio/cli.c
index 956284c9716..10b545edb5e 100644
--- a/src/vnet/devices/virtio/cli.c
+++ b/src/vnet/devices/virtio/cli.c
@@ -42,6 +42,8 @@ virtio_pci_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
 	;
       else if (unformat (line_input, "feature-mask 0x%llx", &feature_mask))
 	args.features = feature_mask;
+      else if (unformat (line_input, "gso-enabled"))
+	args.gso_enabled = 1;
       else
 	return clib_error_return (0, "unknown input `%U'",
 				  format_unformat_error, input);
diff --git a/src/vnet/devices/virtio/pci.c b/src/vnet/devices/virtio/pci.c
index 3736225b25c..f53552a8436 100644
--- a/src/vnet/devices/virtio/pci.c
+++ b/src/vnet/devices/virtio/pci.c
@@ -557,6 +557,27 @@ virtio_pci_send_ctrl_msg (vlib_main_t * vm, virtio_if_t * vif,
 }
 
 static int
+virtio_pci_enable_gso (vlib_main_t * vm, virtio_if_t * vif)
+{
+  virtio_main_t *vim = &virtio_main;
+  struct virtio_ctrl_msg gso_hdr;
+  virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+
+  gso_hdr.ctrl.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS;
+  gso_hdr.ctrl.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET;
+  gso_hdr.status = VIRTIO_NET_ERR;
+  u64 offloads = VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO4)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO6)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_UFO);
+  clib_memcpy (gso_hdr.data, &offloads, sizeof (offloads));
+
+  status = virtio_pci_send_ctrl_msg (vm, vif, &gso_hdr, sizeof (offloads));
+  virtio_log_debug (vim, vif, "enable gso");
+  return status;
+}
+
+static int
 virtio_pci_enable_multiqueue (vlib_main_t * vm, virtio_if_t * vif,
 			      u16 num_queues)
 {
@@ -720,8 +741,18 @@ virtio_negotiate_features (vlib_main_t * vm, virtio_if_t * vif,
    * if features are not requested
    * default: all supported features
    */
-  u64 supported_features = VIRTIO_FEATURE (VIRTIO_NET_F_MTU)
+  u64 supported_features = VIRTIO_FEATURE (VIRTIO_NET_F_CSUM)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_MTU)
     | VIRTIO_FEATURE (VIRTIO_NET_F_MAC)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GSO)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO4)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO6)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_UFO)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_HOST_TSO4)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_HOST_TSO6)
+    | VIRTIO_FEATURE (VIRTIO_NET_F_HOST_UFO)
     | VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)
     | VIRTIO_FEATURE (VIRTIO_NET_F_STATUS)
     | VIRTIO_FEATURE (VIRTIO_NET_F_CTRL_VQ)
@@ -1175,14 +1206,31 @@ virtio_pci_create_if (vlib_main_t * vm, virtio_pci_create_if_args_t * args)
   else
     vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
 
-  if ((vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_CTRL_VQ)) &&
-      (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MQ)))
+  if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_CTRL_VQ))
     {
-      if (virtio_pci_enable_multiqueue (vm, vif, vif->max_queue_pairs))
-	virtio_log_warning (vim, vif, "multiqueue is not set");
+      if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) &&
+	  args->gso_enabled)
+	{
+	  if (virtio_pci_enable_gso (vm, vif))
+	    {
+	      virtio_log_warning (vim, vif, "gso is not enabled");
+	    }
+	  else
+	    {
+	      vif->gso_enabled = 1;
+	      hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
+	      vnm->interface_main.gso_interface_count++;
+	    }
+	}
+      if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MQ))
+	{
+	  if (virtio_pci_enable_multiqueue (vm, vif, vif->max_queue_pairs))
+	    virtio_log_warning (vim, vif, "multiqueue is not set");
+	}
     }
   return;
 
+
 error:
   virtio_pci_delete_if (vm, vif);
   args->rv = VNET_API_ERROR_INVALID_INTERFACE;
@@ -1212,6 +1260,9 @@ virtio_pci_delete_if (vlib_main_t * vm, virtio_if_t * vif)
 
   virtio_pci_legacy_reset (vm, vif);
 
+  if (vif->gso_enabled)
+    vnm->interface_main.gso_interface_count--;
+
   if (vif->hw_if_index)
     {
       vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
diff --git a/src/vnet/devices/virtio/pci.h b/src/vnet/devices/virtio/pci.h
index dcf9b146463..b1e29162108 100644
--- a/src/vnet/devices/virtio/pci.h
+++ b/src/vnet/devices/virtio/pci.h
@@ -101,10 +101,22 @@ typedef enum
  * at the end of the used ring. Guest should ignore the used->flags field. */ \
   _ (VHOST_USER_F_PROTOCOL_FEATURES, 30)
 
+#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
 #define VIRTIO_NET_F_MTU 3
 #define VIRTIO_NET_S_LINK_UP    1	/* Link is up */
 #define VIRTIO_NET_S_ANNOUNCE   2	/* Announcement is needed */
 
+/*
+ * Control network offloads
+ * Reconfigures the network offloads that Guest can handle.
+ * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
+ * Command data format matches the feature bit mask exactly.
+ * See VIRTIO_NET_F_GUEST_* for the list of offloads
+ * that can be enabled/disabled.
+ */
+#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
+#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
+
 /* Common configuration */
 #define VIRTIO_PCI_CAP_COMMON_CFG       1
 /* Notifications */
@@ -233,6 +245,7 @@ typedef struct
   u8 mac_addr_set;
   u8 mac_addr[6];
   u64 features;
+  u8 gso_enabled;
   clib_error_t *error;
 } virtio_pci_create_if_args_t;
 
diff --git a/src/vnet/devices/virtio/virtio.api b/src/vnet/devices/virtio/virtio.api
index 3a40fa9a952..9e81b35c175 100644
--- a/src/vnet/devices/virtio/virtio.api
+++ b/src/vnet/devices/virtio/virtio.api
@@ -22,8 +22,7 @@ option version = "1.0.0";
                       0-15 domain, 16-23 bus, 24-28 slot, 29-31 function
     @param use_random_mac - let the system generate a unique mac address
     @param mac_address - mac addr to assign to the interface if use_radom not set
-    @param tx_ring_sz - the number of entries of TX ring
-    @param rx_ring_sz - the number of entries of RX ring
+    @param gso_enabled - enable gso feature if available, 1 to enable
     @param features - the virtio features which driver should negotiate with device
 */
 define virtio_pci_create
@@ -33,6 +32,7 @@ define virtio_pci_create
   u32 pci_addr;
   u8 use_random_mac;
   u8 mac_address[6];
+  u8 gso_enabled;
   u64 features;
 };
 
diff --git a/src/vnet/devices/virtio/virtio_api.c b/src/vnet/devices/virtio/virtio_api.c
index 82ff791a866..d73e6f877d5 100644
--- a/src/vnet/devices/virtio/virtio_api.c
+++ b/src/vnet/devices/virtio/virtio_api.c
@@ -66,6 +66,10 @@ vl_api_virtio_pci_create_t_handler (vl_api_virtio_pci_create_t * mp)
       ap->mac_addr_set = 1;
     }
   ap->sw_if_index = (u32) ~ 0;
+  if (mp->gso_enabled)
+    ap->gso_enabled = 1;
+  else
+    ap->gso_enabled = 0;
   ap->features = clib_net_to_host_u64 (mp->features);
 
   virtio_pci_create_if (vm, ap);