diff options
Diffstat (limited to 'drivers/net/virtio/virtio_user_ethdev.c')
| -rw-r--r-- | drivers/net/virtio/virtio_user_ethdev.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c new file mode 100644 index 00000000..5ab24711 --- /dev/null +++ b/drivers/net/virtio/virtio_user_ethdev.c @@ -0,0 +1,440 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2016 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <stdint.h> +#include <sys/types.h> +#include <unistd.h> + +#include <rte_malloc.h> +#include <rte_kvargs.h> + +#include "virtio_ethdev.h" +#include "virtio_logs.h" +#include "virtio_pci.h" +#include "virtqueue.h" +#include "virtio_rxtx.h" +#include "virtio_user/virtio_user_dev.h" + +#define virtio_user_get_dev(hw) \ + ((struct virtio_user_dev *)(hw)->virtio_user_dev) + +static void +virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset, + void *dst, int length) +{ + int i; + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + if (offset == offsetof(struct virtio_net_config, mac) && + length == ETHER_ADDR_LEN) { + for (i = 0; i < ETHER_ADDR_LEN; ++i) + ((uint8_t *)dst)[i] = dev->mac_addr[i]; + return; + } + + if (offset == offsetof(struct virtio_net_config, status)) + *(uint16_t *)dst = dev->status; + + if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs)) + *(uint16_t *)dst = dev->max_queue_pairs; +} + +static void +virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset, + const void *src, int length) +{ + int i; + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + if ((offset == offsetof(struct virtio_net_config, mac)) && + (length == ETHER_ADDR_LEN)) + for (i = 0; i < ETHER_ADDR_LEN; ++i) + dev->mac_addr[i] = ((const uint8_t *)src)[i]; + else + PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d\n", + offset, length); +} + +static void +virtio_user_set_status(struct virtio_hw *hw, uint8_t status) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK) + virtio_user_start_device(dev); + dev->status = status; +} + +static void +virtio_user_reset(struct virtio_hw *hw) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + virtio_user_stop_device(dev); +} + +static uint8_t +virtio_user_get_status(struct virtio_hw *hw) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + return dev->status; +} + +static uint64_t +virtio_user_get_features(struct virtio_hw *hw) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + return dev->features; +} + +static void +virtio_user_set_features(struct virtio_hw *hw, uint64_t features) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + dev->features = features; +} + +static uint8_t +virtio_user_get_isr(struct virtio_hw *hw __rte_unused) +{ + /* When config interrupt happens, driver calls this function to query + * what kinds of change happen. Interrupt mode not supported for now. + */ + return 0; +} + +static uint16_t +virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused, + uint16_t vec __rte_unused) +{ + return VIRTIO_MSI_NO_VECTOR; +} + +/* This function is to get the queue size, aka, number of descs, of a specified + * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the + * max supported queues. + */ +static uint16_t +virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + /* Currently, each queue has same queue size */ + return dev->queue_size; +} + +static int +virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq) +{ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + uint16_t queue_idx = vq->vq_queue_index; + uint64_t desc_addr, avail_addr, used_addr; + + desc_addr = (uintptr_t)vq->vq_ring_virt_mem; + avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc); + used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail, + ring[vq->vq_nentries]), + VIRTIO_PCI_VRING_ALIGN); + + dev->vrings[queue_idx].num = vq->vq_nentries; + dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr; + dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr; + dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr; + + return 0; +} + +static void +virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq) +{ + /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU + * correspondingly stops the ioeventfds, and reset the status of + * the device. + * For modern devices, set queue desc, avail, used in PCI bar to 0, + * not see any more behavior in QEMU. + * + * Here we just care about what information to deliver to vhost-user + * or vhost-kernel. So we just close ioeventfd for now. + */ + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + close(dev->callfds[vq->vq_queue_index]); + close(dev->kickfds[vq->vq_queue_index]); +} + +static void +virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq) +{ + uint64_t buf = 1; + struct virtio_user_dev *dev = virtio_user_get_dev(hw); + + if (hw->cvq && (hw->cvq->vq == vq)) { + virtio_user_handle_cq(dev, vq->vq_queue_index); + return; + } + + if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0) + PMD_DRV_LOG(ERR, "failed to kick backend: %s\n", + strerror(errno)); +} + +static const struct virtio_pci_ops virtio_user_ops = { + .read_dev_cfg = virtio_user_read_dev_config, + .write_dev_cfg = virtio_user_write_dev_config, + .reset = virtio_user_reset, + .get_status = virtio_user_get_status, + .set_status = virtio_user_set_status, + .get_features = virtio_user_get_features, + .set_features = virtio_user_set_features, + .get_isr = virtio_user_get_isr, + .set_config_irq = virtio_user_set_config_irq, + .get_queue_num = virtio_user_get_queue_num, + .setup_queue = virtio_user_setup_queue, + .del_queue = virtio_user_del_queue, + .notify_queue = virtio_user_notify_queue, +}; + +static const char *valid_args[] = { +#define VIRTIO_USER_ARG_QUEUES_NUM "queues" + VIRTIO_USER_ARG_QUEUES_NUM, +#define VIRTIO_USER_ARG_CQ_NUM "cq" + VIRTIO_USER_ARG_CQ_NUM, +#define VIRTIO_USER_ARG_MAC "mac" + VIRTIO_USER_ARG_MAC, +#define VIRTIO_USER_ARG_PATH "path" + VIRTIO_USER_ARG_PATH, +#define VIRTIO_USER_ARG_QUEUE_SIZE "queue_size" + VIRTIO_USER_ARG_QUEUE_SIZE, + NULL +}; + +#define VIRTIO_USER_DEF_CQ_EN 0 +#define VIRTIO_USER_DEF_Q_NUM 1 +#define VIRTIO_USER_DEF_Q_SZ 256 + +static int +get_string_arg(const char *key __rte_unused, + const char *value, void *extra_args) +{ + if (!value || !extra_args) + return -EINVAL; + + *(char **)extra_args = strdup(value); + + return 0; +} + +static int +get_integer_arg(const char *key __rte_unused, + const char *value, void *extra_args) +{ + if (!value || !extra_args) + return -EINVAL; + + *(uint64_t *)extra_args = strtoull(value, NULL, 0); + + return 0; +} + +static struct rte_eth_dev * +virtio_user_eth_dev_alloc(const char *name) +{ + struct rte_eth_dev *eth_dev; + struct rte_eth_dev_data *data; + struct virtio_hw *hw; + struct virtio_user_dev *dev; + + eth_dev = rte_eth_dev_allocate(name, RTE_ETH_DEV_VIRTUAL); + if (!eth_dev) { + PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev"); + return NULL; + } + + data = eth_dev->data; + + hw = rte_zmalloc(NULL, sizeof(*hw), 0); + if (!hw) { + PMD_INIT_LOG(ERR, "malloc virtio_hw failed"); + rte_eth_dev_release_port(eth_dev); + return NULL; + } + + dev = rte_zmalloc(NULL, sizeof(*dev), 0); + if (!dev) { + PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed"); + rte_eth_dev_release_port(eth_dev); + rte_free(hw); + return NULL; + } + + hw->vtpci_ops = &virtio_user_ops; + hw->use_msix = 0; + hw->modern = 0; + hw->virtio_user_dev = dev; + data->dev_private = hw; + data->numa_node = SOCKET_ID_ANY; + data->kdrv = RTE_KDRV_NONE; + data->dev_flags = RTE_ETH_DEV_DETACHABLE; + eth_dev->pci_dev = NULL; + eth_dev->driver = NULL; + return eth_dev; +} + +/* Dev initialization routine. Invoked once for each virtio vdev at + * EAL init time, see rte_eal_dev_init(). + * Returns 0 on success. + */ +static int +virtio_user_pmd_devinit(const char *name, const char *params) +{ + struct rte_kvargs *kvlist; + struct rte_eth_dev *eth_dev; + struct virtio_hw *hw; + uint64_t queues = VIRTIO_USER_DEF_Q_NUM; + uint64_t cq = VIRTIO_USER_DEF_CQ_EN; + uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ; + char *path = NULL; + char *mac_addr = NULL; + int ret = -1; + + if (!params || params[0] == '\0') { + PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio-user", + VIRTIO_USER_ARG_QUEUE_SIZE); + goto end; + } + + kvlist = rte_kvargs_parse(params, valid_args); + if (!kvlist) { + PMD_INIT_LOG(ERR, "error when parsing param"); + goto end; + } + + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) + rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH, + &get_string_arg, &path); + else { + PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio-user\n", + VIRTIO_USER_ARG_QUEUE_SIZE); + goto end; + } + + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) + rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC, + &get_string_arg, &mac_addr); + + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) + rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE, + &get_integer_arg, &queue_size); + + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) + rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM, + &get_integer_arg, &queues); + + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) + rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM, + &get_integer_arg, &cq); + else if (queues > 1) + cq = 1; + + if (queues > 1 && cq == 0) { + PMD_INIT_LOG(ERR, "multi-q requires ctrl-q"); + goto end; + } + + eth_dev = virtio_user_eth_dev_alloc(name); + if (!eth_dev) { + PMD_INIT_LOG(ERR, "virtio-user fails to alloc device"); + goto end; + } + + hw = eth_dev->data->dev_private; + if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq, + queue_size, mac_addr) < 0) + goto end; + + /* previously called by rte_eal_pci_probe() for physical dev */ + if (eth_virtio_dev_init(eth_dev) < 0) { + PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails"); + goto end; + } + ret = 0; + +end: + if (path) + free(path); + if (mac_addr) + free(mac_addr); + return ret; +} + +/** Called by rte_eth_dev_detach() */ +static int +virtio_user_pmd_devuninit(const char *name) +{ + struct rte_eth_dev *eth_dev; + struct virtio_hw *hw; + struct virtio_user_dev *dev; + + if (!name) + return -EINVAL; + + PMD_DRV_LOG(INFO, "Un-Initializing %s\n", name); + eth_dev = rte_eth_dev_allocated(name); + if (!eth_dev) + return -ENODEV; + + /* make sure the device is stopped, queues freed */ + rte_eth_dev_close(eth_dev->data->port_id); + + hw = eth_dev->data->dev_private; + dev = hw->virtio_user_dev; + virtio_user_dev_uninit(dev); + + rte_free(eth_dev->data->dev_private); + rte_free(eth_dev->data); + rte_eth_dev_release_port(eth_dev); + + return 0; +} + +static struct rte_driver virtio_user_driver = { + .name = "virtio-user", + .type = PMD_VDEV, + .init = virtio_user_pmd_devinit, + .uninit = virtio_user_pmd_devuninit, +}; + +PMD_REGISTER_DRIVER(virtio_user_driver); |