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authorMohsin Kazmi <sykazmi@cisco.com>2018-10-23 18:00:47 +0200
committerDamjan Marion <damarion@cisco.com>2019-01-21 23:13:20 +0100
commitd6c15af33f3f153e084f14484e884f3ca68dbc23 (patch)
tree97d7d92f4fb57067f0c24900a5363448df92f8b0 /src/vnet/devices/virtio/pci.c
parent8b5d0b8c3a089e88a8872af939302029eb3434d9 (diff)
virtio: Native virtio driver
Change-Id: Id7fccf2f805e578fb05032aeb2b649a74c3c0e56 Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio/pci.c')
-rw-r--r--src/vnet/devices/virtio/pci.c919
1 files changed, 919 insertions, 0 deletions
diff --git a/src/vnet/devices/virtio/pci.c b/src/vnet/devices/virtio/pci.c
new file mode 100644
index 00000000000..63c8c54fdad
--- /dev/null
+++ b/src/vnet/devices/virtio/pci.c
@@ -0,0 +1,919 @@
+/*
+ * 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 <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_ring.h>
+#include <linux/vhost.h>
+#include <sys/eventfd.h>
+#if defined(__x86_64__)
+#include <sys/io.h>
+#endif
+
+#include <vppinfra/types.h>
+#include <vlib/vlib.h>
+#include <vlib/pci/pci.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vpp/app/version.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/devices/virtio/virtio.h>
+#include <vnet/devices/virtio/pci.h>
+
+#define PCI_VENDOR_ID_VIRTIO 0x1af4
+#define PCI_DEVICE_ID_VIRTIO_NIC 0x1000
+/* Doesn't support modern device */
+#define PCI_DEVICE_ID_VIRTIO_NIC_MODERN 0x1041
+
+#define PCI_CAPABILITY_LIST 0x34
+#define PCI_CAP_ID_VNDR 0x09
+#define PCI_CAP_ID_MSIX 0x11
+
+#define PCI_MSIX_ENABLE 0x8000
+
+static u32 msix_enabled = 0;
+
+#define PCI_CONFIG_SIZE ((msix_enabled == VIRTIO_MSIX_ENABLED) ? \
+ 24 : 20)
+
+static pci_device_id_t virtio_pci_device_ids[] = {
+ {
+ .vendor_id = PCI_VENDOR_ID_VIRTIO,
+ .device_id = PCI_DEVICE_ID_VIRTIO_NIC},
+ {
+ .vendor_id = PCI_VENDOR_ID_VIRTIO,
+ .device_id = PCI_DEVICE_ID_VIRTIO_NIC_MODERN},
+ {0},
+};
+
+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 + addr, dst);
+ }
+ else if (len >= 2)
+ {
+ size = 2;
+ vlib_pci_read_io_u16 (vm, h, PCI_CONFIG_SIZE + addr, dst);
+ }
+ else
+ {
+ size = 1;
+ vlib_pci_read_io_u8 (vm, h, PCI_CONFIG_SIZE + 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 + addr, src);
+ }
+ else if (len >= 2)
+ {
+ size = 2;
+ vlib_pci_write_io_u16 (vm, h, PCI_CONFIG_SIZE + addr, src);
+ }
+ else
+ {
+ size = 1;
+ vlib_pci_write_io_u8 (vm, h, PCI_CONFIG_SIZE + addr, src);
+ }
+ src = (u8 *) src + size;
+ addr += size;
+ len -= size;
+ }
+}
+
+static u64
+virtio_pci_legacy_get_features (vlib_main_t * vm, virtio_if_t * vif)
+{
+ u32 features;
+ vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_HOST_FEATURES,
+ &features);
+ return features;
+}
+
+static u32
+virtio_pci_legacy_set_features (vlib_main_t * vm, virtio_if_t * vif,
+ u64 features)
+{
+ if ((features >> 32) != 0)
+ {
+ clib_warning ("only 32 bit features are allowed for legacy virtio!");
+ }
+ u32 feature = 0, guest_features = (u32) features;
+ vlib_pci_write_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
+ &guest_features);
+ vlib_pci_read_io_u32 (vm, vif->pci_dev_handle, VIRTIO_PCI_GUEST_FEATURES,
+ &feature);
+ return feature;
+}
+
+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_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;
+ 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,
+ (u32 *) & addr);
+}
+
+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 u32
+virtio_pci_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hw,
+ u32 flags)
+{
+ return 0;
+}
+
+static clib_error_t *
+virtio_pci_get_max_virtqueue_pairs (vlib_main_t * vm, virtio_if_t * vif)
+{
+ virtio_net_config_t config;
+ clib_error_t *error = 0;
+ u16 max_queue_pairs = 1;
+
+ if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MQ))
+ {
+ virtio_pci_legacy_read_config (vm, vif, &config.max_virtqueue_pairs,
+ sizeof (config.max_virtqueue_pairs), 8);
+ max_queue_pairs = config.max_virtqueue_pairs;
+ }
+
+ if (max_queue_pairs < 1 || max_queue_pairs > 0x8000)
+ clib_error_return (error, "max queue pair is %x", max_queue_pairs);
+
+ vif->max_queue_pairs = max_queue_pairs;
+ return error;
+}
+
+static void
+virtio_pci_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 u32
+virtio_pci_get_mac (vlib_main_t * vm, virtio_if_t * vif)
+{
+ if (vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MAC))
+ {
+ virtio_pci_legacy_read_config (vm, vif, vif->mac_addr,
+ sizeof (vif->mac_addr), 0);
+ return 0;
+ }
+ return 1;
+}
+
+static u16
+virtio_pci_is_link_up (vlib_main_t * vm, virtio_if_t * vif)
+{
+ /*
+ * Minimal driver: assumes link is up
+ */
+ u16 status = 1;
+ if (vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_STATUS))
+ virtio_pci_legacy_read_config (vm, vif, &status, sizeof (status), /* mac */
+ 6);
+ return status;
+}
+
+static void
+virtio_pci_irq_0_handler (vlib_main_t * vm, vlib_pci_dev_handle_t h, u16 line)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ virtio_main_t *vmxm = &virtio_main;
+ uword pd = vlib_pci_get_private_data (vm, h);
+ virtio_if_t *vif = pool_elt_at_index (vmxm->interfaces, pd);
+ u16 qid = line;
+
+ vnet_device_input_set_interrupt_pending (vnm, vif->hw_if_index, qid);
+}
+
+static void
+virtio_pci_irq_1_handler (vlib_main_t * vm, vlib_pci_dev_handle_t h, u16 line)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ virtio_main_t *vmxm = &virtio_main;
+ uword pd = vlib_pci_get_private_data (vm, h);
+ virtio_if_t *vif = pool_elt_at_index (vmxm->interfaces, pd);
+
+ if (virtio_pci_is_link_up (vm, vif) & VIRTIO_NET_S_LINK_UP)
+ {
+ vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
+ vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
+ VNET_HW_INTERFACE_FLAG_LINK_UP);
+ }
+ else
+ {
+ vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
+ vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
+ }
+}
+
+static void
+virtio_pci_irq_handler (vlib_main_t * vm, vlib_pci_dev_handle_t h)
+{
+ virtio_main_t *vmxm = &virtio_main;
+ uword pd = vlib_pci_get_private_data (vm, h);
+ virtio_if_t *vif = pool_elt_at_index (vmxm->interfaces, pd);
+ u8 isr = 0;
+ u16 line = 0;
+
+ isr = virtio_pci_legacy_get_isr (vm, vif);
+
+ /*
+ * If the lower bit is set: look through the used rings of
+ * all virtqueues for the device, to see if any progress has
+ * been made by the device which requires servicing.
+ */
+ if (isr & VIRTIO_PCI_ISR_INTR)
+ virtio_pci_irq_0_handler (vm, h, line);
+
+ if (isr & VIRTIO_PCI_ISR_CONFIG)
+ virtio_pci_irq_1_handler (vm, h, line);
+}
+
+inline void
+device_status (vlib_main_t * vm, virtio_if_t * vif)
+{
+ struct status_struct
+ {
+ u8 bit;
+ char *str;
+ };
+ struct status_struct *status_entry;
+ static struct status_struct status_array[] = {
+#define _(s,b) { .str = #s, .bit = b, },
+ foreach_virtio_config_status_flags
+#undef _
+ {.str = NULL}
+ };
+
+ vlib_cli_output (vm, " status 0x%x", vif->status);
+
+ status_entry = (struct status_struct *) &status_array;
+ while (status_entry->str)
+ {
+ if (vif->status & status_entry->bit)
+ vlib_cli_output (vm, " %s (%x)", status_entry->str,
+ status_entry->bit);
+ status_entry++;
+ }
+}
+
+inline void
+debug_device_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);
+
+ 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 + 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);
+ }
+}
+
+static u8
+virtio_pci_queue_size_valid (u16 qsz)
+{
+ if (qsz < 64 || qsz > 4096)
+ return 0;
+ if ((qsz % 64) != 0)
+ return 0;
+ return 1;
+}
+
+clib_error_t *
+virtio_pci_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx)
+{
+ clib_error_t *error = 0;
+ u16 queue_size = 0;
+ virtio_vring_t *vring;
+ struct vring vr;
+ u32 i = 0;
+ void *ptr;
+
+ queue_size = virtio_pci_legacy_get_queue_num (vm, vif, idx);
+ if (!virtio_pci_queue_size_valid (queue_size))
+ clib_warning ("queue size is not valid");
+
+ if (!is_pow2 (queue_size))
+ return clib_error_return (0, "ring size must be power of 2");
+
+ if (queue_size > 32768)
+ return clib_error_return (0, "ring size must be 32768 or lower");
+
+ if (queue_size == 0)
+ queue_size = 256;
+
+ vec_validate_aligned (vif->vrings, idx, CLIB_CACHE_LINE_BYTES);
+ vring = vec_elt_at_index (vif->vrings, idx);
+
+ i = vring_size (queue_size, VIRTIO_PCI_VRING_ALIGN);
+ i = round_pow2 (i, VIRTIO_PCI_VRING_ALIGN);
+ ptr = vlib_physmem_alloc_aligned (vm, i, VIRTIO_PCI_VRING_ALIGN);
+ memset (ptr, 0, i);
+ vring_init (&vr, queue_size, ptr, VIRTIO_PCI_VRING_ALIGN);
+ vring->desc = vr.desc;
+ vring->avail = vr.avail;
+ vring->used = vr.used;
+ vring->queue_id = idx;
+ vring->avail->flags = VIRTIO_RING_FLAG_MASK_INT;
+
+ ASSERT (vring->buffers == 0);
+ vec_validate_aligned (vring->buffers, queue_size, CLIB_CACHE_LINE_BYTES);
+ ASSERT (vring->indirect_buffers == 0);
+ vec_validate_aligned (vring->indirect_buffers, queue_size,
+ CLIB_CACHE_LINE_BYTES);
+ if (idx % 2)
+ {
+ u32 n_alloc = 0;
+ do
+ {
+ if (n_alloc < queue_size)
+ n_alloc =
+ vlib_buffer_alloc (vm, vring->indirect_buffers + n_alloc,
+ queue_size - n_alloc);
+ }
+ while (n_alloc != queue_size);
+ vif->tx_ring_sz = queue_size;
+ }
+ else
+ vif->rx_ring_sz = queue_size;
+ vring->size = queue_size;
+
+ virtio_pci_legacy_setup_queue (vm, vif, idx, ptr);
+ vring->kick_fd = -1;
+
+ return error;
+}
+
+static void
+virtio_negotiate_features (vlib_main_t * vm, virtio_if_t * vif,
+ u64 req_features)
+{
+ /*
+ * if features are not requested
+ * default: all supported features
+ */
+ u64 supported_features = VIRTIO_FEATURE (VIRTIO_NET_F_MTU)
+ | VIRTIO_FEATURE (VIRTIO_NET_F_MAC)
+ | VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)
+ | VIRTIO_FEATURE (VIRTIO_NET_F_STATUS)
+ | VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)
+ | VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC);
+
+ if (req_features == 0)
+ {
+ req_features = supported_features;
+ }
+
+ vif->features = req_features & vif->remote_features & supported_features;
+
+ if (vif->
+ remote_features & vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MTU))
+ {
+ virtio_net_config_t config;
+ virtio_pci_legacy_read_config (vm, vif, &config.mtu,
+ sizeof (config.mtu), 10);
+ if (config.mtu < 64)
+ vif->features &= ~VIRTIO_FEATURE (VIRTIO_NET_F_MTU);
+ }
+
+ vif->features = virtio_pci_legacy_set_features (vm, vif, vif->features);
+}
+
+void
+virtio_pci_read_device_feature (vlib_main_t * vm, virtio_if_t * vif)
+{
+ vif->remote_features = virtio_pci_legacy_get_features (vm, vif);
+}
+
+int
+virtio_pci_reset_device (vlib_main_t * vm, virtio_if_t * vif)
+{
+ u8 status = 0;
+
+ /*
+ * Reset the device
+ */
+ status = virtio_pci_legacy_reset (vm, vif);
+
+ /*
+ * Set the Acknowledge status bit
+ */
+ virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_ACK);
+
+ /*
+ * Set the Driver status bit
+ */
+ virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_DRIVER);
+
+ /*
+ * Read the status and verify it
+ */
+ status = virtio_pci_legacy_get_status (vm, vif);
+ if (!
+ ((status & VIRTIO_CONFIG_STATUS_ACK)
+ && (status & VIRTIO_CONFIG_STATUS_DRIVER)))
+ return -1;
+ vif->status = status;
+
+ return 0;
+}
+
+clib_error_t *
+virtio_pci_read_caps (vlib_main_t * vm, virtio_if_t * vif)
+{
+ clib_error_t *error = 0;
+ struct virtio_pci_cap cap;
+ u8 pos, common_cfg = 0, notify_base = 0, dev_cfg = 0, isr = 0;
+ vlib_pci_dev_handle_t h = vif->pci_dev_handle;
+
+ if ((error = vlib_pci_read_config_u8 (vm, h, PCI_CAPABILITY_LIST, &pos)))
+ clib_error_return (error, "error in reading capabilty list position");
+
+ while (pos)
+ {
+ if ((error =
+ vlib_pci_read_write_config (vm, h, VLIB_READ, pos, &cap,
+ sizeof (cap))))
+ clib_error_return (error, "error in reading the capability at [%2x]",
+ pos);
+
+ if (cap.cap_vndr == PCI_CAP_ID_MSIX)
+ {
+ u16 flags;
+ if ((error =
+ vlib_pci_read_write_config (vm, h, VLIB_READ, pos + 2, &flags,
+ sizeof (flags))))
+ clib_error_return (error,
+ "error in reading the capability at [%2x]",
+ pos + 2);
+
+ if (flags & PCI_MSIX_ENABLE)
+ msix_enabled = VIRTIO_MSIX_ENABLED;
+ else
+ msix_enabled = VIRTIO_MSIX_DISABLED;
+ }
+
+ if (cap.cap_vndr != PCI_CAP_ID_VNDR)
+ {
+ clib_warning ("[%2x] skipping non VNDR cap id: %2x", pos,
+ cap.cap_vndr);
+ goto next;
+ }
+
+ switch (cap.cfg_type)
+ {
+ case VIRTIO_PCI_CAP_COMMON_CFG:
+ common_cfg = 1;
+ break;
+ case VIRTIO_PCI_CAP_NOTIFY_CFG:
+ notify_base = 1;
+ break;
+ case VIRTIO_PCI_CAP_DEVICE_CFG:
+ dev_cfg = 1;
+ break;
+ case VIRTIO_PCI_CAP_ISR_CFG:
+ isr = 1;
+ break;
+ }
+ next:
+ pos = cap.cap_next;
+ }
+
+ if (common_cfg == 0 || notify_base == 0 || dev_cfg == 0 || isr == 0)
+ {
+ clib_warning ("no modern virtio pci device found");
+ return error;
+ }
+
+ return clib_error_return (error, "modern virtio pci device found");
+}
+
+static clib_error_t *
+virtio_pci_device_init (vlib_main_t * vm, virtio_if_t * vif,
+ virtio_pci_create_if_args_t * args)
+{
+ clib_error_t *error = 0;
+ u8 status = 0;
+
+ virtio_pci_read_caps (vm, vif);
+
+ if (virtio_pci_reset_device (vm, vif) < 0)
+ clib_error_return (error, "Failed to reset the device");
+
+ /*
+ * read device features and negotiate (user) requested features
+ */
+ virtio_pci_read_device_feature (vm, vif);
+ virtio_negotiate_features (vm, vif, args->features);
+
+ /*
+ * After FEATURE_OK, driver should not accept new feature bits
+ */
+ virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_FEATURES_OK);
+ status = virtio_pci_legacy_get_status (vm, vif);
+ if (!(status & VIRTIO_CONFIG_STATUS_FEATURES_OK))
+ clib_error_return (error, "Device doesn't support requested features");
+
+ vif->status = status;
+
+ if (virtio_pci_get_mac (vm, vif))
+ {
+ f64 now = vlib_time_now (vm);
+ u32 rnd;
+ rnd = (u32) (now * 1e6);
+ rnd = random_u32 (&rnd);
+
+ memcpy (vif->mac_addr + 2, &rnd, sizeof (rnd));
+ vif->mac_addr[0] = 2;
+ vif->mac_addr[1] = 0xfe;
+ virtio_pci_set_mac (vm, vif);
+ }
+
+ virtio_set_net_hdr_size (vif);
+
+ if ((error = virtio_pci_get_max_virtqueue_pairs (vm, vif)))
+ goto error;
+
+ if ((error = virtio_pci_vring_init (vm, vif, 0)))
+ goto error;
+
+ if ((error = virtio_pci_vring_init (vm, vif, 1)))
+ goto error;
+
+ if (msix_enabled == VIRTIO_MSIX_ENABLED)
+ {
+ virtio_pci_legacy_set_config_irq (vm, vif, VIRTIO_MSI_NO_VECTOR);
+ virtio_pci_legacy_set_queue_irq (vm, vif, VIRTIO_MSI_NO_VECTOR, 0);
+ }
+ virtio_pci_legacy_set_status (vm, vif, VIRTIO_CONFIG_STATUS_DRIVER_OK);
+ vif->status = virtio_pci_legacy_get_status (vm, vif);
+error:
+ return error;
+}
+
+void
+virtio_pci_create_if (vlib_main_t * vm, virtio_pci_create_if_args_t * args)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ virtio_main_t *vmxm = &virtio_main;
+ virtio_if_t *vif;
+ vlib_pci_dev_handle_t h;
+ clib_error_t *error = 0;
+
+ if (args->rxq_size == 0)
+ args->rxq_size = VIRTIO_NUM_RX_DESC;
+ if (args->txq_size == 0)
+ args->txq_size = VIRTIO_NUM_TX_DESC;
+
+ if (!virtio_pci_queue_size_valid (args->rxq_size) ||
+ !virtio_pci_queue_size_valid (args->txq_size))
+ {
+ args->rv = VNET_API_ERROR_INVALID_VALUE;
+ args->error =
+ clib_error_return (error,
+ "queue size must be <= 4096, >= 64, "
+ "and multiples of 64");
+ return;
+ }
+
+ /* *INDENT-OFF* */
+ pool_foreach (vif, vmxm->interfaces, ({
+ if (vif->pci_addr.as_u32 == args->addr)
+ {
+ args->rv = VNET_API_ERROR_INVALID_VALUE;
+ args->error =
+ clib_error_return (error, "PCI address in use");
+ return;
+ }
+ }));
+ /* *INDENT-ON* */
+
+ pool_get (vmxm->interfaces, vif);
+ vif->dev_instance = vif - vmxm->interfaces;
+ vif->per_interface_next_index = ~0;
+ vif->pci_addr.as_u32 = args->addr;
+
+ if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
+ {
+ args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
+ args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
+ goto error;
+ }
+
+ if ((error =
+ vlib_pci_device_open (vm, (vlib_pci_addr_t *) & vif->pci_addr,
+ virtio_pci_device_ids, &h)))
+ {
+ pool_put (vmxm->interfaces, vif);
+ args->rv = VNET_API_ERROR_INVALID_INTERFACE;
+ args->error =
+ clib_error_return (error, "pci-addr %U", format_vlib_pci_addr,
+ &vif->pci_addr);
+ return;
+ }
+ vif->pci_dev_handle = h;
+ vlib_pci_set_private_data (vm, h, vif->dev_instance);
+
+ if ((error = vlib_pci_bus_master_enable (vm, h)))
+ goto error;
+
+ if ((error = vlib_pci_io_region (vm, h, 0)))
+ goto error;
+
+ if ((error = virtio_pci_device_init (vm, vif, args)))
+ goto error;
+
+ if (msix_enabled == VIRTIO_MSIX_ENABLED)
+ {
+ if ((error = vlib_pci_register_msix_handler (vm, h, 0, 1,
+ &virtio_pci_irq_0_handler)))
+ goto error;
+
+ if ((error = vlib_pci_register_msix_handler (vm, h, 1, 1,
+ &virtio_pci_irq_1_handler)))
+ goto error;
+
+ if ((error = vlib_pci_enable_msix_irq (vm, h, 0, 2)))
+ goto error;
+ }
+ else
+ {
+ vlib_pci_register_intx_handler (vm, h, &virtio_pci_irq_handler);
+ }
+
+ if ((error = vlib_pci_intr_enable (vm, h)))
+ goto error;
+
+ vif->type = VIRTIO_IF_TYPE_PCI;
+ /* create interface */
+ error = ethernet_register_interface (vnm, virtio_device_class.index,
+ vif->dev_instance, vif->mac_addr,
+ &vif->hw_if_index,
+ virtio_pci_flag_change);
+
+ if (error)
+ goto error;
+
+ vnet_sw_interface_t *sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
+ vif->sw_if_index = sw->sw_if_index;
+ args->sw_if_index = sw->sw_if_index;
+
+ vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
+ hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+ vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
+ virtio_input_node.index);
+ vnet_hw_interface_assign_rx_thread (vnm, vif->hw_if_index, 0, ~0);
+
+ if (virtio_pci_is_link_up (vm, vif) & VIRTIO_NET_S_LINK_UP)
+ {
+ vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
+ vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
+ VNET_HW_INTERFACE_FLAG_LINK_UP);
+ }
+ else
+ vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
+ return;
+
+error:
+ virtio_pci_delete_if (vm, vif);
+ args->rv = VNET_API_ERROR_INVALID_INTERFACE;
+ args->error = error;
+}
+
+int
+virtio_pci_delete_if (vlib_main_t * vm, virtio_if_t * vif)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ virtio_main_t *vmxm = &virtio_main;
+ u32 i = 0;
+
+ if (vif->type != VIRTIO_IF_TYPE_PCI)
+ return VNET_API_ERROR_INVALID_INTERFACE;
+
+ vlib_pci_intr_disable (vm, vif->pci_dev_handle);
+
+ virtio_pci_legacy_del_queue (vm, vif, 0);
+ virtio_pci_legacy_del_queue (vm, vif, 1);
+
+ virtio_pci_legacy_reset (vm, vif);
+
+ if (vif->hw_if_index)
+ {
+ vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
+ vnet_hw_interface_unassign_rx_thread (vnm, vif->hw_if_index, 0);
+ ethernet_delete_interface (vnm, vif->hw_if_index);
+ }
+
+ vlib_pci_device_close (vm, vif->pci_dev_handle);
+
+ vec_foreach_index (i, vif->vrings)
+ {
+ virtio_vring_t *vring = vec_elt_at_index (vif->vrings, i);
+ if (vring->kick_fd != -1)
+ close (vring->kick_fd);
+ if (vring->used)
+ {
+ if ((i & 1) == 1)
+ virtio_free_used_desc (vm, vring);
+ else
+ virtio_free_rx_buffers (vm, vring);
+ }
+ if (vring->queue_id % 2)
+ {
+ vlib_buffer_free_no_next (vm, vring->indirect_buffers, vring->size);
+ }
+ vec_free (vring->buffers);
+ vec_free (vring->indirect_buffers);
+ vlib_physmem_free (vm, vring->desc);
+ }
+
+ vec_free (vif->vrings);
+
+ if (vif->fd != -1)
+ close (vif->fd);
+ if (vif->tap_fd != -1)
+ vif->tap_fd = -1;
+ clib_error_free (vif->error);
+ memset (vif, 0, sizeof (*vif));
+ pool_put (vmxm->interfaces, vif);
+
+ return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */