aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/devices/virtio/device.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/vnet/devices/virtio/device.c')
-rw-r--r--src/vnet/devices/virtio/device.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
new file mode 100644
index 00000000000..275a3c74990
--- /dev/null
+++ b/src/vnet/devices/virtio/device.c
@@ -0,0 +1,328 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2016 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/virtio_net.h>
+#include <linux/vhost.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/devices/virtio/virtio.h>
+
+#define foreach_virtio_tx_func_error \
+_(NO_FREE_SLOTS, "no free tx slots") \
+_(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
+_(PENDING_MSGS, "pending msgs in tx ring") \
+_(NO_TX_QUEUES, "no tx queues")
+
+typedef enum
+{
+#define _(f,s) TAP_TX_ERROR_##f,
+ foreach_virtio_tx_func_error
+#undef _
+ TAP_TX_N_ERROR,
+} virtio_tx_func_error_t;
+
+static char *virtio_tx_func_error_strings[] = {
+#define _(n,s) s,
+ foreach_virtio_tx_func_error
+#undef _
+};
+
+u8 *
+format_virtio_device_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ virtio_main_t *mm = &virtio_main;
+ virtio_if_t *vif = pool_elt_at_index (mm->interfaces, dev_instance);
+
+ if (vif->type == VIRTIO_IF_TYPE_TAP)
+ {
+ s = format (s, "tap-%s", vif->name);
+ }
+ else
+ s = format (s, "virtio%lu", vif->dev_instance);
+
+ return s;
+}
+
+static u8 *
+format_virtio_device (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ int verbose = va_arg (*args, int);
+ u32 indent = format_get_indent (s);
+
+ s = format (s, "VIRTIO interface");
+ if (verbose)
+ {
+ s = format (s, "\n%U instance %u", format_white_space, indent + 2,
+ dev_instance);
+ }
+ return s;
+}
+
+static u8 *
+format_virtio_tx_trace (u8 * s, va_list * args)
+{
+ s = format (s, "Unimplemented...");
+ return s;
+}
+
+static_always_inline void
+virtio_free_used_desc (vlib_main_t * vm, virtio_vring_t * vring)
+{
+ u16 used = vring->desc_in_use;
+ u16 sz = vring->size;
+ u16 mask = sz - 1;
+ u16 last = vring->last_used_idx;
+ u16 n_left = vring->used->idx - last;
+
+ if (n_left == 0)
+ return;
+
+ while (n_left)
+ {
+ struct vring_used_elem *e = &vring->used->ring[last & mask];
+ u16 slot = e->id;
+ struct vring_desc *d = &vring->desc[slot];
+
+ if (PREDICT_FALSE (d->flags & VRING_DESC_F_INDIRECT))
+ {
+ d = uword_to_pointer (d->addr, struct vring_desc *);
+ vec_free (d);
+ }
+
+ vlib_buffer_free (vm, &vring->buffers[slot], 1);
+ used--;
+ last++;
+ n_left--;
+ }
+ vring->desc_in_use = used;
+ vring->last_used_idx = last;
+}
+
+static_always_inline u16
+add_buffer_to_slot (vlib_main_t * vm, virtio_vring_t * vring, u32 bi,
+ u16 avail, u16 next, u16 mask)
+{
+ u16 n_added = 0;
+ const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
+ struct vring_desc *d;
+ d = &vring->desc[next];
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+
+ if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
+ {
+ d->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
+ d->len = b->current_length + hdr_sz;
+ d->flags = 0;
+ }
+ else
+ {
+ struct vring_desc *id, *descs = 0;
+
+ /* first buffer in chain */
+ vec_add2_aligned (descs, id, 1, CLIB_CACHE_LINE_BYTES);
+ id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
+ id->len = b->current_length + hdr_sz;
+
+ while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ id->flags = VRING_DESC_F_NEXT;
+ id->next = vec_len (descs);
+ vec_add2_aligned (descs, id, 1, CLIB_CACHE_LINE_BYTES);
+ b = vlib_get_buffer (vm, b->next_buffer);
+ id->addr = pointer_to_uword (vlib_buffer_get_current (b));
+ id->len = b->current_length;
+ }
+
+ d->addr = pointer_to_uword (descs);
+ d->len = vec_len (descs) * sizeof (struct vring_desc);
+ d->flags = VRING_DESC_F_INDIRECT;
+ }
+ vring->buffers[next] = bi;
+ vring->avail->ring[avail & mask] = next;
+ n_added++;
+ return n_added;
+}
+
+
+static_always_inline uword
+virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, virtio_if_t * vif)
+{
+ u8 qid = 0;
+ u16 n_left = frame->n_vectors;
+ virtio_vring_t *vring = vec_elt_at_index (vif->vrings, (qid << 1) + 1);
+ u16 used, next, avail;
+ u16 sz = vring->size;
+ u16 mask = sz - 1;
+ u32 *buffers = vlib_frame_args (frame);
+
+ /* free consumed buffers */
+ virtio_free_used_desc (vm, vring);
+
+ used = vring->desc_in_use;
+ next = vring->desc_next;
+ avail = vring->avail->idx;
+
+ while (n_left && used < sz)
+ {
+ u16 n_added;
+ n_added = add_buffer_to_slot (vm, vring, buffers[0], avail, next, mask);
+ avail += n_added;
+ next = (next + n_added) & mask;
+ used += n_added;
+ buffers++;
+ n_left--;
+ }
+
+ if (n_left != frame->n_vectors)
+ {
+ CLIB_MEMORY_STORE_BARRIER ();
+ vring->avail->idx = avail;
+ vring->desc_next = next;
+ vring->desc_in_use = used;
+ if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
+ {
+ u64 x = 1;
+ CLIB_UNUSED (int r) = write (vring->kick_fd, &x, sizeof (x));
+ }
+ }
+
+
+ if (n_left)
+ {
+ vlib_error_count (vm, node->node_index, TAP_TX_ERROR_NO_FREE_SLOTS,
+ n_left);
+ vlib_buffer_free (vm, buffers, n_left);
+ }
+
+ return frame->n_vectors - n_left;
+}
+
+static uword
+virtio_interface_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ virtio_main_t *nm = &virtio_main;
+ vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
+ virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
+
+ return virtio_interface_tx_inline (vm, node, frame, vif);
+}
+
+static void
+virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
+ u32 node_index)
+{
+ virtio_main_t *apm = &virtio_main;
+ vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
+ virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
+
+ /* Shut off redirection */
+ if (node_index == ~0)
+ {
+ vif->per_interface_next_index = node_index;
+ return;
+ }
+
+ vif->per_interface_next_index =
+ vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
+ node_index);
+}
+
+static void
+virtio_clear_hw_interface_counters (u32 instance)
+{
+ /* Nothing for now */
+}
+
+static clib_error_t *
+virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
+ vnet_hw_interface_rx_mode mode)
+{
+ virtio_main_t *mm = &virtio_main;
+ vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
+ virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
+ virtio_vring_t *vring = vec_elt_at_index (vif->vrings, qid);
+
+ if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
+ vring->avail->flags |= VIRTIO_RING_FLAG_MASK_INT;
+ else
+ vring->avail->flags &= ~VIRTIO_RING_FLAG_MASK_INT;
+
+ return 0;
+}
+
+static clib_error_t *
+virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
+{
+ virtio_main_t *mm = &virtio_main;
+ vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
+ virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
+ static clib_error_t *error = 0;
+
+ if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
+ vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
+ else
+ vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
+
+ return error;
+ return 0;
+}
+
+static clib_error_t *
+virtio_subif_add_del_function (vnet_main_t * vnm,
+ u32 hw_if_index,
+ struct vnet_sw_interface_t *st, int is_add)
+{
+ /* Nothing for now */
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VNET_DEVICE_CLASS (virtio_device_class) = {
+ .name = "virtio",
+ .tx_function = virtio_interface_tx,
+ .format_device_name = format_virtio_device_name,
+ .format_device = format_virtio_device,
+ .format_tx_trace = format_virtio_tx_trace,
+ .tx_function_n_errors = TAP_TX_N_ERROR,
+ .tx_function_error_strings = virtio_tx_func_error_strings,
+ .rx_redirect_to_node = virtio_set_interface_next_node,
+ .clear_counters = virtio_clear_hw_interface_counters,
+ .admin_up_down_function = virtio_interface_admin_up_down,
+ .subif_add_del_function = virtio_subif_add_del_function,
+ .rx_mode_change_function = virtio_interface_rx_mode_change,
+};
+
+VLIB_DEVICE_TX_FUNCTION_MULTIARCH(virtio_device_class,
+ virtio_interface_tx)
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */