src/vnet/devices/virtio/virtio_pci_legacy.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2018 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <vlib/vlib.h>
 #include <vlib/pci/pci.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/ip/ip4_packet.h>
 #include <vnet/ip/ip6_packet.h>
 #include <vnet/devices/virtio/virtio.h>
 #include <vnet/devices/virtio/virtio_pci_legacy.h>
 #include <vnet/devices/virtio/pci.h>

 #define PCI_CONFIG_SIZE(vif) ((vif->msix_enabled == VIRTIO_MSIX_ENABLED) ? \
   24 : 20)

 static void
 virtio_pci_legacy_read_config (vlib_main_t * vm, virtio_if_t * vif, void *dst,
 			       int len, u32 addr)
 {
   u32 size = 0;
   vlib_pci_dev_handle_t h = vif->pci_dev_handle;

   while (len > 0)
     {
       if (len >= 4)
 	{
 	  size = 4;
 	  vlib_pci_read_io_u32 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
 	}
       else if (len >= 2)
 	{
 	  size = 2;
 	  vlib_pci_read_io_u16 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
 	}
       else
 	{
 	  size = 1;
 	  vlib_pci_read_io_u8 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
 	}
       dst = (u8 *) dst + size;
       addr += size;
       len -= size;
     }
 }

 static void
 virtio_pci_legacy_write_config (vlib_main_t * vm, virtio_if_t * vif,
 				void *src, int len, u32 addr)
 {
   u32 size = 0;
   vlib_pci_dev_handle_t h = vif->pci_dev_handle;

   while (len > 0)
     {
       if (len >= 4)
 	{
 	  size = 4;
 	  vlib_pci_write_io_u32 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
 	}
       else if (len >= 2)
 	{
 	  size = 2;
 	  vlib_pci_write_io_u16 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
 	}
       else
 	{
 	  size = 1;
 	  vlib_pci_write_io_u8 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
 	}
       src = (u8 *) src + size;
       addr += size;
       len -= size;
     }
 }

 static u64
 virtio_pci_legacy_get_host_features (vlib_main_t * vm, virtio_if_t * vif)
 {
   u32 host_features;
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_HOST_FEATURES,
 			&host_features);
   return host_features;
 }

 static u64
 virtio_pci_legacy_get_guest_features (vlib_main_t * vm, virtio_if_t * vif)
 {
   u32 guest_features = 0;
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
 			&guest_features);
   vif->features = guest_features;
   return guest_features;
 }

 static void
 virtio_pci_legacy_set_guest_features (vlib_main_t * vm, virtio_if_t * vif,
 				      u64 guest_features)
 {
   if ((guest_features >> 32) != 0)
     {
       clib_warning ("only 32 bit features are allowed for legacy virtio!");
     }
   u32 features = 0;
   u32 gf = (u32) guest_features;

   vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
 			 &gf);
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
 			&features);
   if (features != (u32) guest_features)
     {
       clib_warning ("legacy set guest features failed!");
     }
 }

 static u8
 virtio_pci_legacy_get_status (vlib_main_t * vm, virtio_if_t * vif)
 {
   u8 status = 0;
   vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &status);
   return status;
 }

 static void
 virtio_pci_legacy_set_status (vlib_main_t * vm, virtio_if_t * vif, u8 status)
 {
   if (status != VIRTIO_CONFIG_STATUS_RESET)
     status |= virtio_pci_legacy_get_status (vm, vif);
   vlib_pci_write_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &status);
 }

 static u8
 virtio_pci_legacy_reset (vlib_main_t * vm, virtio_if_t * vif)
 {
   virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_RESET);
   return virtio_pci_legacy_get_status (vm, vif);
 }

 static u8
 virtio_pci_legacy_get_isr (vlib_main_t * vm, virtio_if_t * vif)
 {
   u8 isr = 0;
   vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_ISR, &isr);
   return isr;
 }

 static u16
 virtio_pci_legacy_get_queue_num (vlib_main_t * vm, virtio_if_t * vif,
 				 u16 queue_id)
 {
   u16 queue_num = 0;
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			 &queue_id);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NUM,
 			&queue_num);
   return queue_num;
 }

 static void
 virtio_pci_legacy_set_queue_num (vlib_main_t * vm, virtio_if_t * vif,
 				 u16 queue_id, u16 queue_size)
 {
   /* do nothing */
 }

 static u8
 virtio_pci_legacy_setup_queue (vlib_main_t * vm, virtio_if_t * vif,
 			       u16 queue_id, void *p)
 {
   u64 addr = vlib_physmem_get_pa (vm, p) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
   u32 addr2 = 0, a = (u32) addr;
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			 &queue_id);
   vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN, &a);
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN,
 			&addr2);
   if (addr == addr2)
     return 0;

   clib_warning ("legacy queue setup failed!");
   return 1;
 }

 static void
 virtio_pci_legacy_del_queue (vlib_main_t * vm, virtio_if_t * vif,
 			     u16 queue_id)
 {
   u32 src = 0;
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			 &queue_id);
   vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN, &src);
 }

 inline void
 virtio_pci_legacy_notify_queue (vlib_main_t * vm, virtio_if_t * vif,
 				u16 queue_id)
 {
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NOTIFY,
 			 &queue_id);
 }

 /* Enable one vector (0) for Link State Intrerrupt */
 static u16
 virtio_pci_legacy_set_config_irq (vlib_main_t * vm, virtio_if_t * vif,
 				  u16 vec)
 {
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
 			 &vec);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
 			&vec);
   return vec;
 }

 static u16
 virtio_pci_legacy_set_queue_irq (vlib_main_t * vm, virtio_if_t * vif, u16 vec,
 				 u16 queue_id)
 {
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			 &queue_id);
   vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
 			 &vec);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
 			&vec);
   return vec;
 }

 static void
 virtio_pci_legacy_get_mac (vlib_main_t * vm, virtio_if_t * vif)
 {
   virtio_pci_legacy_read_config (vm, vif, vif->mac_addr,
 				 sizeof (vif->mac_addr), 0);
 }

 static void
 virtio_pci_legacy_set_mac (vlib_main_t * vm, virtio_if_t * vif)
 {
   virtio_pci_legacy_write_config (vm, vif, vif->mac_addr,
 				  sizeof (vif->mac_addr), 0);
 }

 static u16
 virtio_pci_legacy_get_device_status (vlib_main_t * vm, virtio_if_t * vif)
 {
   u16 status = 0;
   virtio_pci_legacy_read_config (vm, vif, &status,
 				 sizeof (status),
 				 STRUCT_OFFSET_OF
 				 (virtio_net_config_t, status));
   return status;
 }

 static u16
 virtio_pci_legacy_get_max_queue_pairs (vlib_main_t * vm, virtio_if_t * vif)
 {
   virtio_net_config_t config;
   virtio_pci_legacy_read_config (vm, vif, &config.max_virtqueue_pairs,
 				 sizeof (config.max_virtqueue_pairs),
 				 STRUCT_OFFSET_OF
 				 (virtio_net_config_t, max_virtqueue_pairs));
   return config.max_virtqueue_pairs;
 }

 static u16
 virtio_pci_legacy_get_mtu (vlib_main_t * vm, virtio_if_t * vif)
 {
   virtio_net_config_t config;
   virtio_pci_legacy_read_config (vm, vif, &config.mtu,
 				 sizeof (config.mtu),
 				 STRUCT_OFFSET_OF (virtio_net_config_t, mtu));
   return config.mtu;
 }


 static void
 virtio_pci_legacy_device_debug_config_space (vlib_main_t * vm,
 					     virtio_if_t * vif)
 {
   u32 data_u32;
   u16 data_u16;
   u8 data_u8;
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_HOST_FEATURES,
 			&data_u32);
   vlib_cli_output (vm, "remote features 0x%lx", data_u32);
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
 			&data_u32);
   vlib_cli_output (vm, "guest features 0x%lx", data_u32);
   vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN,
 			&data_u32);
   vlib_cli_output (vm, "queue address 0x%lx", data_u32);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NUM,
 			&data_u16);
   vlib_cli_output (vm, "queue size 0x%x", data_u16);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			&data_u16);
   vlib_cli_output (vm, "queue select 0x%x", data_u16);
   vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NOTIFY,
 			&data_u16);
   vlib_cli_output (vm, "queue notify 0x%x", data_u16);
   vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &data_u8);
   vlib_cli_output (vm, "status 0x%x", data_u8);
   vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_ISR, &data_u8);
   vlib_cli_output (vm, "isr 0x%x", data_u8);

   if (vif->msix_enabled == VIRTIO_MSIX_ENABLED)
     {
       vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
 			    &data_u16);
       vlib_cli_output (vm, "config vector 0x%x", data_u16);
       u16 queue_id = 0;
       vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
 			     &queue_id);
       vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
 			    &data_u16);
       vlib_cli_output (vm, "queue vector for queue (0) 0x%x", data_u16);
     }

   u8 mac[6];
   virtio_pci_legacy_read_config (vm, vif, mac, sizeof (mac), 0);
   vlib_cli_output (vm, "mac %U", format_ethernet_address, mac);
   virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16),	/* offset to status */
 				 6);
   vlib_cli_output (vm, "link up/down status 0x%x", data_u16);
   virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16),
 				 /* offset to max_virtqueue */ 8);
   vlib_cli_output (vm, "num of virtqueue 0x%x", data_u16);
   virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16),	/* offset to mtu */
 				 10);
   vlib_cli_output (vm, "mtu 0x%x", data_u16);

   u32 i = PCI_CONFIG_SIZE (vif) + 12, a = 4;
   i += a;
   i &= ~a;
   for (; i < 64; i += 4)
     {
       u32 data = 0;
       vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, i, &data);
       vlib_cli_output (vm, "0x%lx", data);
     }
 }

 const virtio_pci_func_t virtio_pci_legacy_func = {
   .read_config = virtio_pci_legacy_read_config,
   .write_config = virtio_pci_legacy_write_config,
   .get_device_features = virtio_pci_legacy_get_host_features,
   .get_driver_features = virtio_pci_legacy_get_guest_features,
   .set_driver_features = virtio_pci_legacy_set_guest_features,
   .get_status = virtio_pci_legacy_get_status,
   .set_status = virtio_pci_legacy_set_status,
   .device_reset = virtio_pci_legacy_reset,
   .get_isr = virtio_pci_legacy_get_isr,
   .get_queue_size = virtio_pci_legacy_get_queue_num,
   .set_queue_size = virtio_pci_legacy_set_queue_num,
   .setup_queue = virtio_pci_legacy_setup_queue,
   .del_queue = virtio_pci_legacy_del_queue,
   .notify_queue = virtio_pci_legacy_notify_queue,
   .set_config_irq = virtio_pci_legacy_set_config_irq,
   .set_queue_irq = virtio_pci_legacy_set_queue_irq,
   .get_mac = virtio_pci_legacy_get_mac,
   .set_mac = virtio_pci_legacy_set_mac,
   .get_device_status = virtio_pci_legacy_get_device_status,
   .get_max_queue_pairs = virtio_pci_legacy_get_max_queue_pairs,
   .get_mtu = virtio_pci_legacy_get_mtu,
   .device_debug_config_space = virtio_pci_legacy_device_debug_config_space,
 };

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2018 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <vlib/vlib.h>
	#include <vlib/pci/pci.h>
	#include <vnet/ethernet/ethernet.h>
	#include <vnet/ip/ip4_packet.h>
	#include <vnet/ip/ip6_packet.h>
	#include <vnet/devices/virtio/virtio.h>
	#include <vnet/devices/virtio/virtio_pci_legacy.h>
	#include <vnet/devices/virtio/pci.h>

	#define PCI_CONFIG_SIZE(vif) ((vif->msix_enabled == VIRTIO_MSIX_ENABLED) ? \
	24 : 20)

	static void
	virtio_pci_legacy_read_config (vlib_main_t * vm, virtio_if_t * vif, void *dst,
	int len, u32 addr)
	{
	u32 size = 0;
	vlib_pci_dev_handle_t h = vif->pci_dev_handle;

	while (len > 0)
	{
	if (len >= 4)
	{
	size = 4;
	vlib_pci_read_io_u32 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
	}
	else if (len >= 2)
	{
	size = 2;
	vlib_pci_read_io_u16 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
	}
	else
	{
	size = 1;
	vlib_pci_read_io_u8 (vm, h, PCI_CONFIG_SIZE (vif) + addr, dst);
	}
	dst = (u8 *) dst + size;
	addr += size;
	len -= size;
	}
	}

	static void
	virtio_pci_legacy_write_config (vlib_main_t * vm, virtio_if_t * vif,
	void *src, int len, u32 addr)
	{
	u32 size = 0;
	vlib_pci_dev_handle_t h = vif->pci_dev_handle;

	while (len > 0)
	{
	if (len >= 4)
	{
	size = 4;
	vlib_pci_write_io_u32 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
	}
	else if (len >= 2)
	{
	size = 2;
	vlib_pci_write_io_u16 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
	}
	else
	{
	size = 1;
	vlib_pci_write_io_u8 (vm, h, PCI_CONFIG_SIZE (vif) + addr, src);
	}
	src = (u8 *) src + size;
	addr += size;
	len -= size;
	}
	}

	static u64
	virtio_pci_legacy_get_host_features (vlib_main_t * vm, virtio_if_t * vif)
	{
	u32 host_features;
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_HOST_FEATURES,
	&host_features);
	return host_features;
	}

	static u64
	virtio_pci_legacy_get_guest_features (vlib_main_t * vm, virtio_if_t * vif)
	{
	u32 guest_features = 0;
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
	&guest_features);
	vif->features = guest_features;
	return guest_features;
	}

	static void
	virtio_pci_legacy_set_guest_features (vlib_main_t * vm, virtio_if_t * vif,
	u64 guest_features)
	{
	if ((guest_features >> 32) != 0)
	{
	clib_warning ("only 32 bit features are allowed for legacy virtio!");
	}
	u32 features = 0;
	u32 gf = (u32) guest_features;

	vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
	&gf);
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
	&features);
	if (features != (u32) guest_features)
	{
	clib_warning ("legacy set guest features failed!");
	}
	}

	static u8
	virtio_pci_legacy_get_status (vlib_main_t * vm, virtio_if_t * vif)
	{
	u8 status = 0;
	vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &status);
	return status;
	}

	static void
	virtio_pci_legacy_set_status (vlib_main_t * vm, virtio_if_t * vif, u8 status)
	{
	if (status != VIRTIO_CONFIG_STATUS_RESET)
	status \|= virtio_pci_legacy_get_status (vm, vif);
	vlib_pci_write_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &status);
	}

	static u8
	virtio_pci_legacy_reset (vlib_main_t * vm, virtio_if_t * vif)
	{
	virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_RESET);
	return virtio_pci_legacy_get_status (vm, vif);
	}

	static u8
	virtio_pci_legacy_get_isr (vlib_main_t * vm, virtio_if_t * vif)
	{
	u8 isr = 0;
	vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_ISR, &isr);
	return isr;
	}

	static u16
	virtio_pci_legacy_get_queue_num (vlib_main_t * vm, virtio_if_t * vif,
	u16 queue_id)
	{
	u16 queue_num = 0;
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&queue_id);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NUM,
	&queue_num);
	return queue_num;
	}

	static void
	virtio_pci_legacy_set_queue_num (vlib_main_t * vm, virtio_if_t * vif,
	u16 queue_id, u16 queue_size)
	{
	/* do nothing */
	}

	static u8
	virtio_pci_legacy_setup_queue (vlib_main_t * vm, virtio_if_t * vif,
	u16 queue_id, void *p)
	{
	u64 addr = vlib_physmem_get_pa (vm, p) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
	u32 addr2 = 0, a = (u32) addr;
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&queue_id);
	vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN, &a);
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN,
	&addr2);
	if (addr == addr2)
	return 0;

	clib_warning ("legacy queue setup failed!");
	return 1;
	}

	static void
	virtio_pci_legacy_del_queue (vlib_main_t * vm, virtio_if_t * vif,
	u16 queue_id)
	{
	u32 src = 0;
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&queue_id);
	vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN, &src);
	}

	inline void
	virtio_pci_legacy_notify_queue (vlib_main_t * vm, virtio_if_t * vif,
	u16 queue_id)
	{
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NOTIFY,
	&queue_id);
	}

	/* Enable one vector (0) for Link State Intrerrupt */
	static u16
	virtio_pci_legacy_set_config_irq (vlib_main_t * vm, virtio_if_t * vif,
	u16 vec)
	{
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
	&vec);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
	&vec);
	return vec;
	}

	static u16
	virtio_pci_legacy_set_queue_irq (vlib_main_t * vm, virtio_if_t * vif, u16 vec,
	u16 queue_id)
	{
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&queue_id);
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
	&vec);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
	&vec);
	return vec;
	}

	static void
	virtio_pci_legacy_get_mac (vlib_main_t * vm, virtio_if_t * vif)
	{
	virtio_pci_legacy_read_config (vm, vif, vif->mac_addr,
	sizeof (vif->mac_addr), 0);
	}

	static void
	virtio_pci_legacy_set_mac (vlib_main_t * vm, virtio_if_t * vif)
	{
	virtio_pci_legacy_write_config (vm, vif, vif->mac_addr,
	sizeof (vif->mac_addr), 0);
	}

	static u16
	virtio_pci_legacy_get_device_status (vlib_main_t * vm, virtio_if_t * vif)
	{
	u16 status = 0;
	virtio_pci_legacy_read_config (vm, vif, &status,
	sizeof (status),
	STRUCT_OFFSET_OF
	(virtio_net_config_t, status));
	return status;
	}

	static u16
	virtio_pci_legacy_get_max_queue_pairs (vlib_main_t * vm, virtio_if_t * vif)
	{
	virtio_net_config_t config;
	virtio_pci_legacy_read_config (vm, vif, &config.max_virtqueue_pairs,
	sizeof (config.max_virtqueue_pairs),
	STRUCT_OFFSET_OF
	(virtio_net_config_t, max_virtqueue_pairs));
	return config.max_virtqueue_pairs;
	}

	static u16
	virtio_pci_legacy_get_mtu (vlib_main_t * vm, virtio_if_t * vif)
	{
	virtio_net_config_t config;
	virtio_pci_legacy_read_config (vm, vif, &config.mtu,
	sizeof (config.mtu),
	STRUCT_OFFSET_OF (virtio_net_config_t, mtu));
	return config.mtu;
	}


	static void
	virtio_pci_legacy_device_debug_config_space (vlib_main_t * vm,
	virtio_if_t * vif)
	{
	u32 data_u32;
	u16 data_u16;
	u8 data_u8;
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_HOST_FEATURES,
	&data_u32);
	vlib_cli_output (vm, "remote features 0x%lx", data_u32);
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
	&data_u32);
	vlib_cli_output (vm, "guest features 0x%lx", data_u32);
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_PFN,
	&data_u32);
	vlib_cli_output (vm, "queue address 0x%lx", data_u32);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NUM,
	&data_u16);
	vlib_cli_output (vm, "queue size 0x%x", data_u16);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&data_u16);
	vlib_cli_output (vm, "queue select 0x%x", data_u16);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_NOTIFY,
	&data_u16);
	vlib_cli_output (vm, "queue notify 0x%x", data_u16);
	vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_STATUS, &data_u8);
	vlib_cli_output (vm, "status 0x%x", data_u8);
	vlib_pci_read_io_u8 (vm, vif->pci_dev_handle, VIRTIO_PCI_ISR, &data_u8);
	vlib_cli_output (vm, "isr 0x%x", data_u8);

	if (vif->msix_enabled == VIRTIO_MSIX_ENABLED)
	{
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_CONFIG_VECTOR,
	&data_u16);
	vlib_cli_output (vm, "config vector 0x%x", data_u16);
	u16 queue_id = 0;
	vlib_pci_write_io_u16 (vm, vif->pci_dev_handle, VIRTIO_PCI_QUEUE_SEL,
	&queue_id);
	vlib_pci_read_io_u16 (vm, vif->pci_dev_handle, VIRTIO_MSI_QUEUE_VECTOR,
	&data_u16);
	vlib_cli_output (vm, "queue vector for queue (0) 0x%x", data_u16);
	}

	u8 mac[6];
	virtio_pci_legacy_read_config (vm, vif, mac, sizeof (mac), 0);
	vlib_cli_output (vm, "mac %U", format_ethernet_address, mac);
	virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16), /* offset to status */
	6);
	vlib_cli_output (vm, "link up/down status 0x%x", data_u16);
	virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16),
	/* offset to max_virtqueue */ 8);
	vlib_cli_output (vm, "num of virtqueue 0x%x", data_u16);
	virtio_pci_legacy_read_config (vm, vif, &data_u16, sizeof (u16), /* offset to mtu */
	10);
	vlib_cli_output (vm, "mtu 0x%x", data_u16);

	u32 i = PCI_CONFIG_SIZE (vif) + 12, a = 4;
	i += a;
	i &= ~a;
	for (; i < 64; i += 4)
	{
	u32 data = 0;
	vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, i, &data);
	vlib_cli_output (vm, "0x%lx", data);
	}
	}

	const virtio_pci_func_t virtio_pci_legacy_func = {
	.read_config = virtio_pci_legacy_read_config,
	.write_config = virtio_pci_legacy_write_config,
	.get_device_features = virtio_pci_legacy_get_host_features,
	.get_driver_features = virtio_pci_legacy_get_guest_features,
	.set_driver_features = virtio_pci_legacy_set_guest_features,
	.get_status = virtio_pci_legacy_get_status,
	.set_status = virtio_pci_legacy_set_status,
	.device_reset = virtio_pci_legacy_reset,
	.get_isr = virtio_pci_legacy_get_isr,
	.get_queue_size = virtio_pci_legacy_get_queue_num,
	.set_queue_size = virtio_pci_legacy_set_queue_num,
	.setup_queue = virtio_pci_legacy_setup_queue,
	.del_queue = virtio_pci_legacy_del_queue,
	.notify_queue = virtio_pci_legacy_notify_queue,
	.set_config_irq = virtio_pci_legacy_set_config_irq,
	.set_queue_irq = virtio_pci_legacy_set_queue_irq,
	.get_mac = virtio_pci_legacy_get_mac,
	.set_mac = virtio_pci_legacy_set_mac,
	.get_device_status = virtio_pci_legacy_get_device_status,
	.get_max_queue_pairs = virtio_pci_legacy_get_max_queue_pairs,
	.get_mtu = virtio_pci_legacy_get_mtu,
	.device_debug_config_space = virtio_pci_legacy_device_debug_config_space,
	};

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/