530af95a78
Don't signal host that receive ring has been read until all events have been processed. This reduces the number of guest exits and therefore improves performance. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
408 lines
9.9 KiB
C
408 lines
9.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (c) 2018, Microsoft Corporation.
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* All Rights Reserved.
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*/
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#ifndef _VMBUS_H_
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#define _VMBUS_H_
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/**
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* @file
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*
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* VMBUS Interface
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <rte_compat.h>
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#include <rte_uuid.h>
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#include <rte_debug.h>
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#include <rte_interrupts.h>
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#include <rte_dev.h>
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#include <rte_vmbus_reg.h>
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/* Forward declarations */
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struct rte_vmbus_device;
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struct rte_vmbus_driver;
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struct rte_vmbus_bus;
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struct vmbus_channel;
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struct vmbus_mon_page;
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TAILQ_HEAD(rte_vmbus_device_list, rte_vmbus_device);
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TAILQ_HEAD(rte_vmbus_driver_list, rte_vmbus_driver);
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/* VMBus iterators */
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#define FOREACH_DEVICE_ON_VMBUS(p) \
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TAILQ_FOREACH(p, &(rte_vmbus_bus.device_list), next)
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#define FOREACH_DRIVER_ON_VMBUS(p) \
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TAILQ_FOREACH(p, &(rte_vmbus_bus.driver_list), next)
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/** Maximum number of VMBUS resources. */
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enum hv_uio_map {
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HV_TXRX_RING_MAP = 0,
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HV_INT_PAGE_MAP,
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HV_MON_PAGE_MAP,
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HV_RECV_BUF_MAP,
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HV_SEND_BUF_MAP
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};
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#define VMBUS_MAX_RESOURCE 5
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/**
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* A structure describing a VMBUS device.
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*/
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struct rte_vmbus_device {
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TAILQ_ENTRY(rte_vmbus_device) next; /**< Next probed VMBUS device */
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const struct rte_vmbus_driver *driver; /**< Associated driver */
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struct rte_device device; /**< Inherit core device */
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rte_uuid_t device_id; /**< VMBUS device id */
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rte_uuid_t class_id; /**< VMBUS device type */
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uint32_t relid; /**< id for primary */
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uint8_t monitor_id; /**< monitor page */
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int uio_num; /**< UIO device number */
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uint32_t *int_page; /**< VMBUS interrupt page */
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struct vmbus_channel *primary; /**< VMBUS primary channel */
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struct vmbus_mon_page *monitor_page; /**< VMBUS monitor page */
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struct rte_intr_handle intr_handle; /**< Interrupt handle */
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struct rte_mem_resource resource[VMBUS_MAX_RESOURCE];
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};
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/**
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* Initialization function for the driver called during VMBUS probing.
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*/
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typedef int (vmbus_probe_t)(struct rte_vmbus_driver *,
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struct rte_vmbus_device *);
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/**
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* Initialization function for the driver called during hot plugging.
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*/
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typedef int (vmbus_remove_t)(struct rte_vmbus_device *);
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/**
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* A structure describing a VMBUS driver.
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*/
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struct rte_vmbus_driver {
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TAILQ_ENTRY(rte_vmbus_driver) next; /**< Next in list. */
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struct rte_driver driver;
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struct rte_vmbus_bus *bus; /**< VM bus reference. */
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vmbus_probe_t *probe; /**< Device Probe function. */
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vmbus_remove_t *remove; /**< Device Remove function. */
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const rte_uuid_t *id_table; /**< ID table. */
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};
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/**
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* Structure describing the VM bus
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*/
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struct rte_vmbus_bus {
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struct rte_bus bus; /**< Inherit the generic class */
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struct rte_vmbus_device_list device_list; /**< List of devices */
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struct rte_vmbus_driver_list driver_list; /**< List of drivers */
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};
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/**
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* Scan the content of the VMBUS bus, and the devices in the devices
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* list
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*
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* @return
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* 0 on success, negative on error
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*/
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int rte_vmbus_scan(void);
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/**
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* Probe the VMBUS bus
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*
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* @return
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* - 0 on success.
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* - !0 on error.
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*/
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int rte_vmbus_probe(void);
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/**
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* Map the VMBUS device resources in user space virtual memory address
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*
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* @param dev
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* A pointer to a rte_vmbus_device structure describing the device
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* to use
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*
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* @return
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* 0 on success, negative on error and positive if no driver
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* is found for the device.
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*/
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int rte_vmbus_map_device(struct rte_vmbus_device *dev);
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/**
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* Unmap this device
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*
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* @param dev
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* A pointer to a rte_vmbus_device structure describing the device
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* to use
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*/
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void rte_vmbus_unmap_device(struct rte_vmbus_device *dev);
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/**
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* Get connection to primary VMBUS channel
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*
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* @param device
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* A pointer to a rte_vmbus_device structure describing the device
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* @param chan
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* A pointer to a VMBUS channel pointer that will be filled.
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* @return
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* - 0 Success; channel opened.
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* - -ENOMEM: Not enough memory available.
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* - -EINVAL: Regions could not be mapped.
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*/
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int rte_vmbus_chan_open(struct rte_vmbus_device *device,
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struct vmbus_channel **chan);
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/**
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* Free connection to VMBUS channel
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*
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* @param chan
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* VMBUS channel
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*/
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void rte_vmbus_chan_close(struct vmbus_channel *chan);
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/**
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* Gets the maximum number of channels supported on device
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*
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* @param device
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* A pointer to a rte_vmbus_device structure describing the device
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* @return
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* Number of channels available.
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*/
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int rte_vmbus_max_channels(const struct rte_vmbus_device *device);
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/**
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* Get a connection to new secondary vmbus channel
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*
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* @param primary
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* A pointer to primary VMBUS channel
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* @param chan
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* A pointer to a secondary VMBUS channel pointer that will be filled.
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* @return
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* - 0 Success; channel opened.
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* - -ENOMEM: Not enough memory available.
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* - -EINVAL: Regions could not be mapped.
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*/
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int rte_vmbus_subchan_open(struct vmbus_channel *primary,
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struct vmbus_channel **new_chan);
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/**
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* Disable IRQ for device
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*
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* @param device
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* VMBUS device
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*/
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void rte_vmbus_irq_mask(struct rte_vmbus_device *device);
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/**
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* Enable IRQ for device
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*
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* @param device
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* VMBUS device
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*/
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void rte_vmbus_irq_unmask(struct rte_vmbus_device *device);
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/**
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* Read (and wait) for IRQ
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*
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* @param device
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* VMBUS device
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*/
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int rte_vmbus_irq_read(struct rte_vmbus_device *device);
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/**
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* Test if channel is empty
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @return
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* Return true if no data present in incoming ring.
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*/
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bool rte_vmbus_chan_rx_empty(const struct vmbus_channel *channel);
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/**
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* Send the specified buffer on the given channel
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @param type
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* Type of packet that is being send e.g. negotiate, time
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* packet etc.
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* @param data
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* Pointer to the buffer to send
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* @param dlen
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* Number of bytes of data to send
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* @param xact
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* Identifier of the request
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* @param flags
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* Message type inband, rxbuf, gpa
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* @param need_sig
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* Is host signal tx is required (optional)
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*
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* Sends data in buffer directly to hyper-v via the vmbus
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*/
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int rte_vmbus_chan_send(struct vmbus_channel *channel, uint16_t type,
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void *data, uint32_t dlen,
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uint64_t xact, uint32_t flags, bool *need_sig);
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/**
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* Explicitly signal host that data is available
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*
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* @param
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* Pointer to vmbus_channel structure.
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*
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* Used when batching multiple sends and only signaling host
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* after the last send.
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*/
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void rte_vmbus_chan_signal_tx(const struct vmbus_channel *channel);
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/* Structure for scatter/gather I/O */
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struct iova_list {
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rte_iova_t addr;
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uint32_t len;
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};
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#define MAX_PAGE_BUFFER_COUNT 32
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/**
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* Send a scattered buffer on the given channel
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @param type
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* Type of packet that is being send e.g. negotiate, time
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* packet etc.
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* @param gpa
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* Array of buffers to send
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* @param gpacnt
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* Number of elements in iov
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* @param data
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* Pointer to the buffer additional data to send
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* @param dlen
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* Maximum size of what the the buffer will hold
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* @param xact
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* Identifier of the request
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* @param flags
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* Message type inband, rxbuf, gpa
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* @param need_sig
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* Is host signal tx is required (optional)
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*
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* Sends data in buffer directly to hyper-v via the vmbus
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*/
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int rte_vmbus_chan_send_sglist(struct vmbus_channel *channel,
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struct vmbus_gpa gpa[], uint32_t gpacnt,
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void *data, uint32_t dlen,
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uint64_t xact, bool *need_sig);
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/**
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* Receive response to request on the given channel
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* skips the channel header.
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @param data
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* Pointer to the buffer you want to receive the data into.
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* @param len
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* Pointer to size of receive buffer (in/out)
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* @param
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* Pointer to received transaction_id
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* @return
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* On success, returns 0
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* On failure, returns negative errno.
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*/
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int rte_vmbus_chan_recv(struct vmbus_channel *chan,
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void *data, uint32_t *len,
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uint64_t *request_id);
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/**
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* Receive response to request on the given channel
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* includes the channel header.
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @param data
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* Pointer to the buffer you want to receive the data into.
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* @param len
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* Pointer to size of receive buffer (in/out)
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* @return
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* On success, returns number of bytes read.
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* On failure, returns negative errno.
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*/
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int rte_vmbus_chan_recv_raw(struct vmbus_channel *chan,
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void *data, uint32_t *len);
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/**
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* Notify host of bytes read (after recv_raw)
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* Signals host if required.
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @param bytes_read
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* Number of bytes read since last signal
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*/
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void rte_vmbus_chan_signal_read(struct vmbus_channel *chan, uint32_t bytes_read);
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/**
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* Determine sub channel index of the given channel
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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* @return
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* Sub channel index (0 for primary)
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*/
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uint16_t rte_vmbus_sub_channel_index(const struct vmbus_channel *chan);
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/**
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* Register a VMBUS driver.
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*
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* @param driver
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* A pointer to a rte_vmbus_driver structure describing the driver
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* to be registered.
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*/
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void rte_vmbus_register(struct rte_vmbus_driver *driver);
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/**
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* For debug dump contents of ring buffer.
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*
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* @param channel
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* Pointer to vmbus_channel structure.
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*/
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void rte_vmbus_chan_dump(FILE *f, const struct vmbus_channel *chan);
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/**
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* Unregister a VMBUS driver.
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*
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* @param driver
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* A pointer to a rte_vmbus_driver structure describing the driver
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* to be unregistered.
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*/
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void rte_vmbus_unregister(struct rte_vmbus_driver *driver);
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/** Helper for VMBUS device registration from driver instance */
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#define RTE_PMD_REGISTER_VMBUS(nm, vmbus_drv) \
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RTE_INIT(vmbusinitfn_ ##nm); \
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static void vmbusinitfn_ ##nm(void) \
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{ \
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(vmbus_drv).driver.name = RTE_STR(nm); \
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rte_vmbus_register(&vmbus_drv); \
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} \
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RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
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#ifdef __cplusplus
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}
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#endif
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#endif /* _VMBUS_H_ */
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