#ifndef _VIRTIO_NET_H_
#define _VIRTIO_NET_H_
+/**
+ * @file
+ * Interface to vhost net
+ */
+
+#include <stdint.h>
+#include <linux/vhost.h>
+#include <linux/virtio_ring.h>
+#include <linux/virtio_net.h>
+#include <sys/eventfd.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+
+#include <rte_memory.h>
+#include <rte_mempool.h>
+#include <rte_ether.h>
+
+struct rte_mbuf;
+
+#define VHOST_MEMORY_MAX_NREGIONS 8
+
/* Used to indicate that the device is running on a data core */
#define VIRTIO_DEV_RUNNING 1
#define BUF_VECTOR_MAX 256
-/*
+/**
* Structure contains buffer address, length and descriptor index
* from vring to do scatter RX.
-*/
+ */
struct buf_vector {
-uint64_t buf_addr;
-uint32_t buf_len;
-uint32_t desc_idx;
+ uint64_t buf_addr;
+ uint32_t buf_len;
+ uint32_t desc_idx;
};
-/*
- * Structure contains variables relevant to TX/RX virtqueues.
+/**
+ * Structure contains variables relevant to RX/TX virtqueues.
*/
-struct vhost_virtqueue
-{
- struct vring_desc *desc; /* Virtqueue descriptor ring. */
- struct vring_avail *avail; /* Virtqueue available ring. */
- struct vring_used *used; /* Virtqueue used ring. */
- uint32_t size; /* Size of descriptor ring. */
- uint32_t backend; /* Backend value to determine if device should started/stopped. */
- uint16_t vhost_hlen; /* Vhost header length (varies depending on RX merge buffers. */
- volatile uint16_t last_used_idx; /* Last index used on the available ring */
- volatile uint16_t last_used_idx_res; /* Used for multiple devices reserving buffers. */
- eventfd_t callfd; /* Currently unused as polling mode is enabled. */
- eventfd_t kickfd; /* Used to notify the guest (trigger interrupt). */
- /* Used for scatter RX. */
- struct buf_vector buf_vec[BUF_VECTOR_MAX];
+struct vhost_virtqueue {
+ struct vring_desc *desc; /**< Virtqueue descriptor ring. */
+ struct vring_avail *avail; /**< Virtqueue available ring. */
+ struct vring_used *used; /**< Virtqueue used ring. */
+ uint32_t size; /**< Size of descriptor ring. */
+ int backend; /**< Backend value to determine if device should started/stopped. */
+ uint16_t vhost_hlen; /**< Vhost header length (varies depending on RX merge buffers. */
+ volatile uint16_t last_used_idx; /**< Last index used on the available ring */
+ volatile uint16_t last_used_idx_res; /**< Used for multiple devices reserving buffers. */
+#define VIRTIO_INVALID_EVENTFD (-1)
+#define VIRTIO_UNINITIALIZED_EVENTFD (-2)
+ int callfd; /**< Used to notify the guest (trigger interrupt). */
+ int kickfd; /**< Currently unused as polling mode is enabled. */
+ int enabled;
+ uint64_t log_guest_addr; /**< Physical address of used ring, for logging */
+ uint64_t reserved[15]; /**< Reserve some spaces for future extension. */
+ struct buf_vector buf_vec[BUF_VECTOR_MAX]; /**< for scatter RX. */
} __rte_cache_aligned;
+/* Old kernels have no such macro defined */
+#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
+ #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
+#endif
+
+
+/*
+ * Make an extra wrapper for VIRTIO_NET_F_MQ and
+ * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX as they are
+ * introduced since kernel v3.8. This makes our
+ * code buildable for older kernel.
+ */
+#ifdef VIRTIO_NET_F_MQ
+ #define VHOST_MAX_QUEUE_PAIRS VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
+ #define VHOST_SUPPORTS_MQ (1ULL << VIRTIO_NET_F_MQ)
+#else
+ #define VHOST_MAX_QUEUE_PAIRS 1
+ #define VHOST_SUPPORTS_MQ 0
+#endif
+
/*
+ * Define virtio 1.0 for older kernels
+ */
+#ifndef VIRTIO_F_VERSION_1
+ #define VIRTIO_F_VERSION_1 32
+#endif
+
+/**
* Device structure contains all configuration information relating to the device.
*/
-struct virtio_net
-{
- struct vhost_virtqueue *virtqueue[VIRTIO_QNUM]; /* Contains all virtqueue information. */
- struct virtio_memory *mem; /* QEMU memory and memory region information. */
- uint64_t features; /* Negotiated feature set. */
- uint64_t device_fh; /* device identifier. */
- uint32_t flags; /* Device flags. Only used to check if device is running on data core. */
+struct virtio_net {
+ struct virtio_memory *mem; /**< QEMU memory and memory region information. */
+ uint64_t features; /**< Negotiated feature set. */
+ uint64_t protocol_features; /**< Negotiated protocol feature set. */
+ uint64_t device_fh; /**< device identifier. */
+ uint32_t flags; /**< Device flags. Only used to check if device is running on data core. */
+#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
+ char ifname[IF_NAME_SZ]; /**< Name of the tap device or socket path. */
+ uint32_t virt_qp_nb; /**< number of queue pair we have allocated */
+ void *priv; /**< private context */
+ uint64_t log_size; /**< Size of log area */
+ uint64_t log_base; /**< Where dirty pages are logged */
+ struct ether_addr mac; /**< MAC address */
+ rte_atomic16_t broadcast_rarp; /**< A flag to tell if we need broadcast rarp packet */
+ uint64_t reserved[61]; /**< Reserve some spaces for future extension. */
+ struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; /**< Contains all virtqueue information. */
} __rte_cache_aligned;
-/*
+/**
* Information relating to memory regions including offsets to addresses in QEMUs memory file.
*/
struct virtio_memory_regions {
- uint64_t guest_phys_address; /* Base guest physical address of region. */
- uint64_t guest_phys_address_end; /* End guest physical address of region. */
- uint64_t memory_size; /* Size of region. */
- uint64_t userspace_address; /* Base userspace address of region. */
- uint64_t address_offset; /* Offset of region for address translation. */
+ uint64_t guest_phys_address; /**< Base guest physical address of region. */
+ uint64_t guest_phys_address_end; /**< End guest physical address of region. */
+ uint64_t memory_size; /**< Size of region. */
+ uint64_t userspace_address; /**< Base userspace address of region. */
+ uint64_t address_offset; /**< Offset of region for address translation. */
};
-/*
+/**
* Memory structure includes region and mapping information.
*/
struct virtio_memory {
- uint64_t base_address; /* Base QEMU userspace address of the memory file. */
- uint64_t mapped_address; /* Mapped address of memory file base in our applications memory space. */
- uint64_t mapped_size; /* Total size of memory file. */
- uint32_t nregions; /* Number of memory regions. */
- /* Memory region information. */
- struct virtio_memory_regions regions[0];
+ uint64_t base_address; /**< Base QEMU userspace address of the memory file. */
+ uint64_t mapped_address; /**< Mapped address of memory file base in our applications memory space. */
+ uint64_t mapped_size; /**< Total size of memory file. */
+ uint32_t nregions; /**< Number of memory regions. */
+ struct virtio_memory_regions regions[0]; /**< Memory region information. */
};
-/*
- * Device operations to add/remove device.
+/**
+ * Device and vring operations.
+ *
+ * Make sure to set VIRTIO_DEV_RUNNING to the device flags in new_device and
+ * remove it in destroy_device.
+ *
*/
struct virtio_net_device_ops {
- int (* new_device) (struct virtio_net *); /* Add device. */
- void (* destroy_device) (volatile struct virtio_net *); /* Remove device. */
+ int (*new_device)(struct virtio_net *); /**< Add device. */
+ void (*destroy_device)(volatile struct virtio_net *); /**< Remove device. */
+
+ int (*vring_state_changed)(struct virtio_net *dev, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */
};
-int init_virtio_net(struct virtio_net_device_ops const * const);
-int deinit_virtio_net(void);
+static inline uint16_t __attribute__((always_inline))
+rte_vring_available_entries(struct virtio_net *dev, uint16_t queue_id)
+{
+ struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
+
+ if (!vq->enabled)
+ return 0;
+
+ return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx_res;
+}
+
+/**
+ * Function to convert guest physical addresses to vhost virtual addresses.
+ * This is used to convert guest virtio buffer addresses.
+ */
+static inline uint64_t __attribute__((always_inline))
+gpa_to_vva(struct virtio_net *dev, uint64_t guest_pa)
+{
+ struct virtio_memory_regions *region;
+ uint32_t regionidx;
+ uint64_t vhost_va = 0;
+
+ for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
+ region = &dev->mem->regions[regionidx];
+ if ((guest_pa >= region->guest_phys_address) &&
+ (guest_pa <= region->guest_phys_address_end)) {
+ vhost_va = region->address_offset + guest_pa;
+ break;
+ }
+ }
+ return vhost_va;
+}
+
+
+/**
+ * Disable features in feature_mask. Returns 0 on success.
+ */
+int rte_vhost_feature_disable(uint64_t feature_mask);
+
+/**
+ * Enable features in feature_mask. Returns 0 on success.
+ */
+int rte_vhost_feature_enable(uint64_t feature_mask);
+
+/* Returns currently supported vhost features */
+uint64_t rte_vhost_feature_get(void);
+
+int rte_vhost_enable_guest_notification(struct virtio_net *dev, uint16_t queue_id, int enable);
+
+/* Register vhost driver. dev_name could be different for multiple instance support. */
+int rte_vhost_driver_register(const char *dev_name);
-struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
+/* Unregister vhost driver. This is only meaningful to vhost user. */
+int rte_vhost_driver_unregister(const char *dev_name);
+
+/* Register callbacks. */
+int rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const);
+/* Start vhost driver session blocking loop. */
+int rte_vhost_driver_session_start(void);
+
+/**
+ * This function adds buffers to the virtio devices RX virtqueue. Buffers can
+ * be received from the physical port or from another virtual device. A packet
+ * count is returned to indicate the number of packets that were succesfully
+ * added to the RX queue.
+ * @param dev
+ * virtio-net device
+ * @param queue_id
+ * virtio queue index in mq case
+ * @param pkts
+ * array to contain packets to be enqueued
+ * @param count
+ * packets num to be enqueued
+ * @return
+ * num of packets enqueued
+ */
+uint16_t rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint16_t count);
+
+/**
+ * This function gets guest buffers from the virtio device TX virtqueue,
+ * construct host mbufs, copies guest buffer content to host mbufs and
+ * store them in pkts to be processed.
+ * @param dev
+ * virtio-net device
+ * @param queue_id
+ * virtio queue index in mq case
+ * @param mbuf_pool
+ * mbuf_pool where host mbuf is allocated.
+ * @param pkts
+ * array to contain packets to be dequeued
+ * @param count
+ * packets num to be dequeued
+ * @return
+ * num of packets dequeued
+ */
+uint16_t rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
#endif /* _VIRTIO_NET_H_ */