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/*
*------------------------------------------------------------------
* Copyright (c) 2017 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.
*------------------------------------------------------------------
*/
#ifndef _VNET_DEVICES_VIRTIO_VIRTIO_H_
#define _VNET_DEVICES_VIRTIO_VIRTIO_H_
#include <linux/virtio_config.h>
#include <linux/virtio_net.h>
#include <linux/virtio_pci.h>
#include <linux/virtio_ring.h>
#define foreach_virtio_net_features \
_ (VIRTIO_NET_F_CSUM, 0) /* Host handles pkts w/ partial csum */ \
_ (VIRTIO_NET_F_GUEST_CSUM, 1) /* Guest handles pkts w/ partial csum */ \
_ (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, 2) /* Dynamic offload configuration. */ \
_ (VIRTIO_NET_F_MTU, 3) /* Initial MTU advice. */ \
_ (VIRTIO_NET_F_MAC, 5) /* Host has given MAC address. */ \
_ (VIRTIO_NET_F_GSO, 6) /* Host handles pkts w/ any GSO. */ \
_ (VIRTIO_NET_F_GUEST_TSO4, 7) /* Guest can handle TSOv4 in. */ \
_ (VIRTIO_NET_F_GUEST_TSO6, 8) /* Guest can handle TSOv6 in. */ \
_ (VIRTIO_NET_F_GUEST_ECN, 9) /* Guest can handle TSO[6] w/ ECN in. */ \
_ (VIRTIO_NET_F_GUEST_UFO, 10) /* Guest can handle UFO in. */ \
_ (VIRTIO_NET_F_HOST_TSO4, 11) /* Host can handle TSOv4 in. */ \
_ (VIRTIO_NET_F_HOST_TSO6, 12) /* Host can handle TSOv6 in. */ \
_ (VIRTIO_NET_F_HOST_ECN, 13) /* Host can handle TSO[6] w/ ECN in. */ \
_ (VIRTIO_NET_F_HOST_UFO, 14) /* Host can handle UFO in. */ \
_ (VIRTIO_NET_F_MRG_RXBUF, 15) /* Host can merge receive buffers. */ \
_ (VIRTIO_NET_F_STATUS, 16) /* virtio_net_config.status available */ \
_ (VIRTIO_NET_F_CTRL_VQ, 17) /* Control channel available */ \
_ (VIRTIO_NET_F_CTRL_RX, 18) /* Control channel RX mode support */ \
_ (VIRTIO_NET_F_CTRL_VLAN, 19) /* Control channel VLAN filtering */ \
_ (VIRTIO_NET_F_CTRL_RX_EXTRA, 20) /* Extra RX mode control support */ \
_ (VIRTIO_NET_F_GUEST_ANNOUNCE, 21) /* Guest can announce device on the network */ \
_ (VIRTIO_NET_F_MQ, 22) /* Device supports Receive Flow Steering */ \
_ (VIRTIO_NET_F_CTRL_MAC_ADDR, 23) /* Set MAC address */ \
_ (VIRTIO_F_NOTIFY_ON_EMPTY, 24) \
_ (VHOST_F_LOG_ALL, 26) /* Log all write descriptors */ \
_ (VIRTIO_F_ANY_LAYOUT, 27) /* Can the device handle any descripor layout */ \
_ (VIRTIO_RING_F_INDIRECT_DESC, 28) /* Support indirect buffer descriptors */ \
_ (VIRTIO_RING_F_EVENT_IDX, 29) /* The Guest publishes the used index for which it expects an interrupt \
* at the end of the avail ring. Host should ignore the avail->flags field. */ \
/* The Host publishes the avail index for which it expects a kick \
* at the end of the used ring. Guest should ignore the used->flags field. */ \
_ (VHOST_USER_F_PROTOCOL_FEATURES, 30) \
_ (VIRTIO_F_VERSION_1, 32)
#define foreach_virtio_if_flag \
_(0, ADMIN_UP, "admin-up") \
_(1, DELETING, "deleting")
typedef enum
{
#define _(a, b, c) VIRTIO_IF_FLAG_##b = (1 << a),
foreach_virtio_if_flag
#undef _
} virtio_if_flag_t;
#define VIRTIO_NUM_RX_DESC 256
#define VIRTIO_NUM_TX_DESC 256
#define VIRTIO_FEATURE(X) (1ULL << X)
#define TX_QUEUE(X) ((X*2) + 1)
#define RX_QUEUE(X) (X*2)
#define TX_QUEUE_ACCESS(X) (X/2)
#define RX_QUEUE_ACCESS(X) (X/2)
typedef enum
{
VIRTIO_IF_TYPE_TAP,
VIRTIO_IF_TYPE_PCI,
VIRTIO_IF_N_TYPES,
} virtio_if_type_t;
typedef struct
{
u8 mac[6];
u16 status;
u16 max_virtqueue_pairs;
u16 mtu;
} virtio_net_config_t;
#define VIRTIO_RING_FLAG_MASK_INT 1
typedef struct
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
struct vring_desc *desc;
struct vring_used *used;
struct vring_avail *avail;
clib_spinlock_t lockp;
u16 desc_in_use;
u16 desc_next;
int kick_fd;
int call_fd;
u8 buffer_pool_index;
u16 size;
u16 queue_id;
u16 flags;
u32 call_file_index;
u32 *buffers;
u16 last_used_idx;
u16 last_kick_avail_idx;
} virtio_vring_t;
typedef union
{
struct
{
u16 domain;
u8 bus;
u8 slot:5;
u8 function:3;
};
u32 as_u32;
} pci_addr_t;
typedef struct
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
u32 flags;
u32 dev_instance;
u32 hw_if_index;
u32 sw_if_index;
u32 numa_node;
u16 virtio_net_hdr_sz;
virtio_if_type_t type;
union
{
u32 id;
pci_addr_t pci_addr;
};
u32 per_interface_next_index;
union
{
int fd;
u32 msix_enabled;
};
union
{
int tap_fd;
u32 pci_dev_handle;
};
virtio_vring_t *rxq_vrings;
virtio_vring_t *txq_vrings;
u64 features, remote_features;
/* error */
clib_error_t *error;
u8 support_int_mode; /* support interrupt mode */
u16 max_queue_pairs;
u16 num_rxqs;
u16 num_txqs;
u8 status;
u8 mac_addr[6];
u8 *host_if_name;
u8 *net_ns;
u8 *host_bridge;
u8 host_mac_addr[6];
ip4_address_t host_ip4_addr;
u8 host_ip4_prefix_len;
ip6_address_t host_ip6_addr;
u8 host_ip6_prefix_len;
int gso_enabled;
int ifindex;
virtio_vring_t *cxq_vring;
} virtio_if_t;
typedef struct
{
/* logging */
vlib_log_class_t log_default;
virtio_if_t *interfaces;
} virtio_main_t;
extern virtio_main_t virtio_main;
extern vnet_device_class_t virtio_device_class;
extern vlib_node_registration_t virtio_input_node;
clib_error_t *virtio_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx,
u16 sz);
clib_error_t *virtio_vring_free_rx (vlib_main_t * vm, virtio_if_t * vif,
u32 idx);
clib_error_t *virtio_vring_free_tx (vlib_main_t * vm, virtio_if_t * vif,
u32 idx);
void virtio_vring_set_numa_node (vlib_main_t * vm, virtio_if_t * vif,
u32 idx);
extern void virtio_free_used_desc (vlib_main_t * vm, virtio_vring_t * vring);
extern void virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring);
extern void virtio_set_net_hdr_size (virtio_if_t * vif);
extern void virtio_show (vlib_main_t * vm, u32 * hw_if_indices, u8 show_descr,
u32 type);
extern void virtio_pci_legacy_notify_queue (vlib_main_t * vm,
virtio_if_t * vif, u16 queue_id);
format_function_t format_virtio_device_name;
static_always_inline void
virtio_kick (vlib_main_t * vm, virtio_vring_t * vring, virtio_if_t * vif)
{
if (vif->type == VIRTIO_IF_TYPE_PCI)
virtio_pci_legacy_notify_queue (vm, vif, vring->queue_id);
else
{
u64 x = 1;
int __clib_unused r;
r = write (vring->kick_fd, &x, sizeof (x));
vring->last_kick_avail_idx = vring->avail->idx;
}
}
#endif /* _VNET_DEVICES_VIRTIO_VIRTIO_H_ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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