+++ /dev/null
-/*
- *------------------------------------------------------------------
- * vhost-user-output
- *
- * Copyright (c) 2014-2018 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 <stddef.h>
-#include <fcntl.h> /* for open */
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/uio.h> /* for iovec */
-#include <netinet/in.h>
-#include <sys/vfs.h>
-
-#include <linux/if_arp.h>
-#include <linux/if_tun.h>
-
-#include <vlib/vlib.h>
-#include <vlib/unix/unix.h>
-
-#include <vnet/ethernet/ethernet.h>
-#include <vnet/devices/devices.h>
-#include <vnet/feature/feature.h>
-#include <vnet/ip/ip_psh_cksum.h>
-
-#include <vnet/devices/virtio/vhost_user.h>
-#include <vnet/devices/virtio/vhost_user_inline.h>
-
-#include <vnet/gso/hdr_offset_parser.h>
-/*
- * On the transmit side, we keep processing the buffers from vlib in the while
- * loop and prepare the copy order to be executed later. However, the static
- * array which we keep the copy order is limited to VHOST_USER_COPY_ARRAY_N
- * entries. In order to not corrupt memory, we have to do the copy when the
- * static array reaches the copy threshold. We subtract 40 in case the code
- * goes into the inner loop for a maximum of 64k frames which may require
- * more array entries. We subtract 200 because our default buffer size is
- * 2048 and the default desc len is likely 1536. While it takes less than 40
- * vlib buffers for the jumbo frame, it may take twice as much descriptors
- * for the same jumbo frame. Use 200 for the extra head room.
- */
-#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 200)
-
-extern vnet_device_class_t vhost_user_device_class;
-
-#define foreach_vhost_user_tx_func_error \
- _(NONE, "no error") \
- _(NOT_READY, "vhost vring not ready") \
- _(DOWN, "vhost interface is down") \
- _(PKT_DROP_NOBUF, "tx packet drops (no available descriptors)") \
- _(PKT_DROP_NOMRG, "tx packet drops (cannot merge descriptors)") \
- _(MMAP_FAIL, "mmap failure") \
- _(INDIRECT_OVERFLOW, "indirect descriptor table overflow")
-
-typedef enum
-{
-#define _(f,s) VHOST_USER_TX_FUNC_ERROR_##f,
- foreach_vhost_user_tx_func_error
-#undef _
- VHOST_USER_TX_FUNC_N_ERROR,
-} vhost_user_tx_func_error_t;
-
-static __clib_unused char *vhost_user_tx_func_error_strings[] = {
-#define _(n,s) s,
- foreach_vhost_user_tx_func_error
-#undef _
-};
-
-static __clib_unused u8 *
-format_vhost_user_interface_name (u8 * s, va_list * args)
-{
- u32 i = va_arg (*args, u32);
- u32 show_dev_instance = ~0;
- vhost_user_main_t *vum = &vhost_user_main;
-
- if (i < vec_len (vum->show_dev_instance_by_real_dev_instance))
- show_dev_instance = vum->show_dev_instance_by_real_dev_instance[i];
-
- if (show_dev_instance != ~0)
- i = show_dev_instance;
-
- s = format (s, "VirtualEthernet0/0/%d", i);
- return s;
-}
-
-static __clib_unused int
-vhost_user_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance)
-{
- // FIXME: check if the new dev instance is already used
- vhost_user_main_t *vum = &vhost_user_main;
- vhost_user_intf_t *vui = pool_elt_at_index (vum->vhost_user_interfaces,
- hi->dev_instance);
-
- vec_validate_init_empty (vum->show_dev_instance_by_real_dev_instance,
- hi->dev_instance, ~0);
-
- vum->show_dev_instance_by_real_dev_instance[hi->dev_instance] =
- new_dev_instance;
-
- vu_log_debug (vui, "renumbered vhost-user interface dev_instance %d to %d",
- hi->dev_instance, new_dev_instance);
-
- return 0;
-}
-
-static_always_inline void
-vhost_user_tx_trace (vhost_trace_t * t,
- vhost_user_intf_t * vui, u16 qid,
- vlib_buffer_t * b, vhost_user_vring_t * rxvq)
-{
- vhost_user_main_t *vum = &vhost_user_main;
- u32 last_avail_idx = rxvq->last_avail_idx;
- u32 desc_current = rxvq->avail->ring[last_avail_idx & rxvq->qsz_mask];
- vnet_virtio_vring_desc_t *hdr_desc = 0;
- u32 hint = 0;
-
- clib_memset (t, 0, sizeof (*t));
- t->device_index = vui - vum->vhost_user_interfaces;
- t->qid = qid;
-
- hdr_desc = &rxvq->desc[desc_current];
- if (rxvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
- /* Header is the first here */
- hdr_desc = map_guest_mem (vui, rxvq->desc[desc_current].addr, &hint);
- }
- if (rxvq->desc[desc_current].flags & VRING_DESC_F_NEXT)
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
- }
- if (!(rxvq->desc[desc_current].flags & VRING_DESC_F_NEXT) &&
- !(rxvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT))
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
- }
-
- t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
-}
-
-static_always_inline u32
-vhost_user_tx_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy,
- u16 copy_len, u32 * map_hint)
-{
- void *dst0, *dst1, *dst2, *dst3;
- if (PREDICT_TRUE (copy_len >= 4))
- {
- if (PREDICT_FALSE (!(dst2 = map_guest_mem (vui, cpy[0].dst, map_hint))))
- return 1;
- if (PREDICT_FALSE (!(dst3 = map_guest_mem (vui, cpy[1].dst, map_hint))))
- return 1;
- while (PREDICT_TRUE (copy_len >= 4))
- {
- dst0 = dst2;
- dst1 = dst3;
-
- if (PREDICT_FALSE
- (!(dst2 = map_guest_mem (vui, cpy[2].dst, map_hint))))
- return 1;
- if (PREDICT_FALSE
- (!(dst3 = map_guest_mem (vui, cpy[3].dst, map_hint))))
- return 1;
-
- clib_prefetch_load ((void *) cpy[2].src);
- clib_prefetch_load ((void *) cpy[3].src);
-
- clib_memcpy_fast (dst0, (void *) cpy[0].src, cpy[0].len);
- clib_memcpy_fast (dst1, (void *) cpy[1].src, cpy[1].len);
-
- vhost_user_log_dirty_pages_2 (vui, cpy[0].dst, cpy[0].len, 1);
- vhost_user_log_dirty_pages_2 (vui, cpy[1].dst, cpy[1].len, 1);
- copy_len -= 2;
- cpy += 2;
- }
- }
- while (copy_len)
- {
- if (PREDICT_FALSE (!(dst0 = map_guest_mem (vui, cpy->dst, map_hint))))
- return 1;
- clib_memcpy_fast (dst0, (void *) cpy->src, cpy->len);
- vhost_user_log_dirty_pages_2 (vui, cpy->dst, cpy->len, 1);
- copy_len -= 1;
- cpy += 1;
- }
- return 0;
-}
-
-static_always_inline void
-vhost_user_handle_tx_offload (vhost_user_intf_t *vui, vlib_buffer_t *b,
- vnet_virtio_net_hdr_t *hdr)
-{
- generic_header_offset_t gho = { 0 };
- int is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
- int is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
- vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
- u16 psh_cksum = 0;
- ip4_header_t *ip4 = 0;
- ip6_header_t *ip6 = 0;
-
- ASSERT (!(is_ip4 && is_ip6));
- vnet_generic_header_offset_parser (b, &gho, 1 /* l2 */ , is_ip4, is_ip6);
- if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
- {
- ip4 =
- (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
- ip4->checksum = ip4_header_checksum (ip4);
- psh_cksum = ip4_pseudo_header_cksum (ip4);
- }
- else
- {
- ip6 = (ip6_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
- psh_cksum = ip6_pseudo_header_cksum (ip6);
- }
-
- /* checksum offload */
- if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
- {
- udp_header_t *udp =
- (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
- udp->checksum = psh_cksum;
- hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
- hdr->csum_start = gho.l4_hdr_offset;
- hdr->csum_offset = offsetof (udp_header_t, checksum);
- }
- else if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
- {
- tcp_header_t *tcp =
- (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
- tcp->checksum = psh_cksum;
- hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
- hdr->csum_start = gho.l4_hdr_offset;
- hdr->csum_offset = offsetof (tcp_header_t, checksum);
- }
-
- /* GSO offload */
- if (b->flags & VNET_BUFFER_F_GSO)
- {
- if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
- {
- if (is_ip4 &&
- (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO4)))
- {
- hdr->gso_size = vnet_buffer2 (b)->gso_size;
- hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
- }
- else if (is_ip6 &&
- (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO6)))
- {
- hdr->gso_size = vnet_buffer2 (b)->gso_size;
- hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
- }
- }
- else if ((vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_UFO)) &&
- (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM))
- {
- hdr->gso_size = vnet_buffer2 (b)->gso_size;
- hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
- }
- }
-}
-
-static_always_inline void
-vhost_user_mark_desc_available (vlib_main_t * vm, vhost_user_intf_t * vui,
- vhost_user_vring_t * rxvq,
- u16 * n_descs_processed, u8 chained,
- vlib_frame_t * frame, u32 n_left)
-{
- u16 desc_idx, flags;
- vnet_virtio_vring_packed_desc_t *desc_table = rxvq->packed_desc;
- u16 last_used_idx = rxvq->last_used_idx;
-
- if (PREDICT_FALSE (*n_descs_processed == 0))
- return;
-
- if (rxvq->used_wrap_counter)
- flags = desc_table[last_used_idx & rxvq->qsz_mask].flags |
- (VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
- else
- flags = desc_table[last_used_idx & rxvq->qsz_mask].flags &
- ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
-
- vhost_user_advance_last_used_idx (rxvq);
-
- for (desc_idx = 1; desc_idx < *n_descs_processed; desc_idx++)
- {
- if (rxvq->used_wrap_counter)
- desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags |=
- (VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
- else
- desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags &=
- ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
- vhost_user_advance_last_used_idx (rxvq);
- }
-
- desc_table[last_used_idx & rxvq->qsz_mask].flags = flags;
-
- *n_descs_processed = 0;
-
- if (chained)
- {
- vnet_virtio_vring_packed_desc_t *desc_table = rxvq->packed_desc;
-
- while (desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags &
- VRING_DESC_F_NEXT)
- vhost_user_advance_last_used_idx (rxvq);
-
- /* Advance past the current chained table entries */
- vhost_user_advance_last_used_idx (rxvq);
- }
-
- /* interrupt (call) handling */
- if ((rxvq->callfd_idx != ~0) &&
- (rxvq->avail_event->flags != VRING_EVENT_F_DISABLE))
- {
- vhost_user_main_t *vum = &vhost_user_main;
-
- rxvq->n_since_last_int += frame->n_vectors - n_left;
- if (rxvq->n_since_last_int > vum->coalesce_frames)
- vhost_user_send_call (vm, vui, rxvq);
- }
-}
-
-static_always_inline void
-vhost_user_tx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui,
- u16 qid, vlib_buffer_t * b,
- vhost_user_vring_t * rxvq)
-{
- vhost_user_main_t *vum = &vhost_user_main;
- u32 last_avail_idx = rxvq->last_avail_idx;
- u32 desc_current = last_avail_idx & rxvq->qsz_mask;
- vnet_virtio_vring_packed_desc_t *hdr_desc = 0;
- u32 hint = 0;
-
- clib_memset (t, 0, sizeof (*t));
- t->device_index = vui - vum->vhost_user_interfaces;
- t->qid = qid;
-
- hdr_desc = &rxvq->packed_desc[desc_current];
- if (rxvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT)
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
- /* Header is the first here */
- hdr_desc = map_guest_mem (vui, rxvq->packed_desc[desc_current].addr,
- &hint);
- }
- if (rxvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT)
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
- }
- if (!(rxvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) &&
- !(rxvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT))
- {
- t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
- }
-
- t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
-}
-
-static_always_inline uword
-vhost_user_device_class_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
- vlib_frame_t *frame, vhost_user_intf_t *vui,
- vhost_user_vring_t *rxvq)
-{
- u32 *buffers = vlib_frame_vector_args (frame);
- u32 n_left = frame->n_vectors;
- vhost_user_main_t *vum = &vhost_user_main;
- u32 qid = rxvq->qid;
- u8 error;
- u32 thread_index = vm->thread_index;
- vhost_cpu_t *cpu = &vum->cpus[thread_index];
- u32 map_hint = 0;
- u8 retry = 8;
- u16 copy_len;
- u16 tx_headers_len;
- vnet_virtio_vring_packed_desc_t *desc_table;
- u32 or_flags;
- u16 desc_head, desc_index, desc_len;
- u16 n_descs_processed;
- u8 indirect, chained;
-
-retry:
- error = VHOST_USER_TX_FUNC_ERROR_NONE;
- tx_headers_len = 0;
- copy_len = 0;
- n_descs_processed = 0;
-
- while (n_left > 0)
- {
- vlib_buffer_t *b0, *current_b0;
- uword buffer_map_addr;
- u32 buffer_len;
- u16 bytes_left;
- u32 total_desc_len = 0;
- u16 n_entries = 0;
-
- indirect = 0;
- chained = 0;
- if (PREDICT_TRUE (n_left > 1))
- vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD);
-
- b0 = vlib_get_buffer (vm, buffers[0]);
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- cpu->current_trace = vlib_add_trace (vm, node, b0,
- sizeof (*cpu->current_trace));
- vhost_user_tx_trace_packed (cpu->current_trace, vui, qid / 2, b0,
- rxvq);
- }
-
- desc_table = rxvq->packed_desc;
- desc_head = desc_index = rxvq->last_avail_idx & rxvq->qsz_mask;
- if (PREDICT_FALSE (!vhost_user_packed_desc_available (rxvq, desc_head)))
- {
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF;
- goto done;
- }
- /*
- * Go deeper in case of indirect descriptor.
- * To test it, turn off mrg_rxbuf.
- */
- if (desc_table[desc_head].flags & VRING_DESC_F_INDIRECT)
- {
- indirect = 1;
- if (PREDICT_FALSE (desc_table[desc_head].len <
- sizeof (vnet_virtio_vring_packed_desc_t)))
- {
- error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW;
- goto done;
- }
- n_entries = desc_table[desc_head].len >> 4;
- desc_table = map_guest_mem (vui, desc_table[desc_index].addr,
- &map_hint);
- if (PREDICT_FALSE (desc_table == 0))
- {
- error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL;
- goto done;
- }
- desc_index = 0;
- }
- else if (rxvq->packed_desc[desc_head].flags & VRING_DESC_F_NEXT)
- chained = 1;
-
- desc_len = vui->virtio_net_hdr_sz;
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
-
- /* Get a header from the header array */
- vnet_virtio_net_hdr_mrg_rxbuf_t *hdr = &cpu->tx_headers[tx_headers_len];
- tx_headers_len++;
- hdr->hdr.flags = 0;
- hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
- hdr->num_buffers = 1;
-
- or_flags = (b0->flags & VNET_BUFFER_F_OFFLOAD);
-
- /* Guest supports csum offload and buffer requires checksum offload? */
- if (or_flags &&
- (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM)))
- vhost_user_handle_tx_offload (vui, b0, &hdr->hdr);
-
- /* Prepare a copy order executed later for the header */
- ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
- vhost_copy_t *cpy = &cpu->copy[copy_len];
- copy_len++;
- cpy->len = vui->virtio_net_hdr_sz;
- cpy->dst = buffer_map_addr;
- cpy->src = (uword) hdr;
-
- buffer_map_addr += vui->virtio_net_hdr_sz;
- buffer_len -= vui->virtio_net_hdr_sz;
- bytes_left = b0->current_length;
- current_b0 = b0;
- while (1)
- {
- if (buffer_len == 0)
- {
- /* Get new output */
- if (chained)
- {
- /*
- * Next one is chained
- * Test it with both indirect and mrg_rxbuf off
- */
- if (PREDICT_FALSE (!(desc_table[desc_index].flags &
- VRING_DESC_F_NEXT)))
- {
- /*
- * Last descriptor in chain.
- * Dequeue queued descriptors for this packet
- */
- vhost_user_dequeue_chained_descs (rxvq,
- &n_descs_processed);
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF;
- goto done;
- }
- vhost_user_advance_last_avail_idx (rxvq);
- desc_index = rxvq->last_avail_idx & rxvq->qsz_mask;
- n_descs_processed++;
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
- total_desc_len += desc_len;
- desc_len = 0;
- }
- else if (indirect)
- {
- /*
- * Indirect table
- * Test it with mrg_rxnuf off
- */
- if (PREDICT_TRUE (n_entries > 0))
- n_entries--;
- else
- {
- /* Dequeue queued descriptors for this packet */
- vhost_user_dequeue_chained_descs (rxvq,
- &n_descs_processed);
- error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW;
- goto done;
- }
- total_desc_len += desc_len;
- desc_index = (desc_index + 1) & rxvq->qsz_mask;
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
- desc_len = 0;
- }
- else if (vui->virtio_net_hdr_sz == 12)
- {
- /*
- * MRG is available
- * This is the default setting for the guest VM
- */
- vnet_virtio_net_hdr_mrg_rxbuf_t *hdr =
- &cpu->tx_headers[tx_headers_len - 1];
-
- desc_table[desc_index].len = desc_len;
- vhost_user_advance_last_avail_idx (rxvq);
- desc_head = desc_index =
- rxvq->last_avail_idx & rxvq->qsz_mask;
- hdr->num_buffers++;
- n_descs_processed++;
- desc_len = 0;
-
- if (PREDICT_FALSE (!vhost_user_packed_desc_available
- (rxvq, desc_index)))
- {
- /* Dequeue queued descriptors for this packet */
- vhost_user_dequeue_descs (rxvq, hdr,
- &n_descs_processed);
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF;
- goto done;
- }
-
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
- }
- else
- {
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG;
- goto done;
- }
- }
-
- ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
- vhost_copy_t *cpy = &cpu->copy[copy_len];
- copy_len++;
- cpy->len = bytes_left;
- cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len;
- cpy->dst = buffer_map_addr;
- cpy->src = (uword) vlib_buffer_get_current (current_b0) +
- current_b0->current_length - bytes_left;
-
- bytes_left -= cpy->len;
- buffer_len -= cpy->len;
- buffer_map_addr += cpy->len;
- desc_len += cpy->len;
-
- clib_prefetch_load (&rxvq->packed_desc);
-
- /* Check if vlib buffer has more data. If not, get more or break */
- if (PREDICT_TRUE (!bytes_left))
- {
- if (PREDICT_FALSE
- (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT))
- {
- current_b0 = vlib_get_buffer (vm, current_b0->next_buffer);
- bytes_left = current_b0->current_length;
- }
- else
- {
- /* End of packet */
- break;
- }
- }
- }
-
- /* Move from available to used ring */
- total_desc_len += desc_len;
- rxvq->packed_desc[desc_head].len = total_desc_len;
-
- vhost_user_advance_last_avail_table_idx (vui, rxvq, chained);
- n_descs_processed++;
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- cpu->current_trace->hdr = cpu->tx_headers[tx_headers_len - 1];
-
- n_left--;
-
- /*
- * Do the copy periodically to prevent
- * cpu->copy array overflow and corrupt memory
- */
- if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD) || chained)
- {
- if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len,
- &map_hint)))
- vlib_error_count (vm, node->node_index,
- VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1);
- copy_len = 0;
-
- /* give buffers back to driver */
- vhost_user_mark_desc_available (vm, vui, rxvq, &n_descs_processed,
- chained, frame, n_left);
- }
-
- buffers++;
- }
-
-done:
- if (PREDICT_TRUE (copy_len))
- {
- if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len,
- &map_hint)))
- vlib_error_count (vm, node->node_index,
- VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1);
-
- vhost_user_mark_desc_available (vm, vui, rxvq, &n_descs_processed,
- chained, frame, n_left);
- }
-
- /*
- * When n_left is set, error is always set to something too.
- * In case error is due to lack of remaining buffers, we go back up and
- * retry.
- * The idea is that it is better to waste some time on packets
- * that have been processed already than dropping them and get
- * more fresh packets with a good likelyhood that they will be dropped too.
- * This technique also gives more time to VM driver to pick-up packets.
- * In case the traffic flows from physical to virtual interfaces, this
- * technique will end-up leveraging the physical NIC buffer in order to
- * absorb the VM's CPU jitter.
- */
- if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry)
- {
- retry--;
- goto retry;
- }
-
- clib_spinlock_unlock (&rxvq->vring_lock);
-
- if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE))
- {
- vlib_error_count (vm, node->node_index, error, n_left);
- vlib_increment_simple_counter
- (vnet_main.interface_main.sw_if_counters +
- VNET_INTERFACE_COUNTER_DROP, thread_index, vui->sw_if_index, n_left);
- }
-
- vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
- return frame->n_vectors;
-}
-
-VNET_DEVICE_CLASS_TX_FN (vhost_user_device_class) (vlib_main_t * vm,
- vlib_node_runtime_t *
- node, vlib_frame_t * frame)
-{
- u32 *buffers = vlib_frame_vector_args (frame);
- u32 n_left = frame->n_vectors;
- vhost_user_main_t *vum = &vhost_user_main;
- vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
- vhost_user_intf_t *vui =
- pool_elt_at_index (vum->vhost_user_interfaces, rd->dev_instance);
- u32 qid;
- vhost_user_vring_t *rxvq;
- u8 error;
- u32 thread_index = vm->thread_index;
- vhost_cpu_t *cpu = &vum->cpus[thread_index];
- u32 map_hint = 0;
- u8 retry = 8;
- u16 copy_len;
- u16 tx_headers_len;
- u32 or_flags;
- vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
-
- if (PREDICT_FALSE (!vui->admin_up))
- {
- error = VHOST_USER_TX_FUNC_ERROR_DOWN;
- goto done3;
- }
-
- if (PREDICT_FALSE (!vui->is_ready))
- {
- error = VHOST_USER_TX_FUNC_ERROR_NOT_READY;
- goto done3;
- }
-
- qid = VHOST_VRING_IDX_RX (tf->queue_id);
- rxvq = &vui->vrings[qid];
- ASSERT (tf->queue_id == rxvq->qid);
-
- if (PREDICT_FALSE (rxvq->avail == 0))
- {
- error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL;
- goto done3;
- }
- if (tf->shared_queue)
- clib_spinlock_lock (&rxvq->vring_lock);
-
- if (vhost_user_is_packed_ring_supported (vui))
- return (vhost_user_device_class_packed (vm, node, frame, vui, rxvq));
-
-retry:
- error = VHOST_USER_TX_FUNC_ERROR_NONE;
- tx_headers_len = 0;
- copy_len = 0;
- while (n_left > 0)
- {
- vlib_buffer_t *b0, *current_b0;
- u16 desc_head, desc_index, desc_len;
- vnet_virtio_vring_desc_t *desc_table;
- uword buffer_map_addr;
- u32 buffer_len;
- u16 bytes_left;
-
- if (PREDICT_TRUE (n_left > 1))
- vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD);
-
- b0 = vlib_get_buffer (vm, buffers[0]);
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- cpu->current_trace = vlib_add_trace (vm, node, b0,
- sizeof (*cpu->current_trace));
- vhost_user_tx_trace (cpu->current_trace, vui, qid / 2, b0, rxvq);
- }
-
- if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx))
- {
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF;
- goto done;
- }
-
- desc_table = rxvq->desc;
- desc_head = desc_index =
- rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask];
-
- /* Go deeper in case of indirect descriptor
- * I don't know of any driver providing indirect for RX. */
- if (PREDICT_FALSE (rxvq->desc[desc_head].flags & VRING_DESC_F_INDIRECT))
- {
- if (PREDICT_FALSE (rxvq->desc[desc_head].len <
- sizeof (vnet_virtio_vring_desc_t)))
- {
- error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW;
- goto done;
- }
- if (PREDICT_FALSE
- (!(desc_table =
- map_guest_mem (vui, rxvq->desc[desc_index].addr,
- &map_hint))))
- {
- error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL;
- goto done;
- }
- desc_index = 0;
- }
-
- desc_len = vui->virtio_net_hdr_sz;
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
-
- {
- // Get a header from the header array
- vnet_virtio_net_hdr_mrg_rxbuf_t *hdr =
- &cpu->tx_headers[tx_headers_len];
- tx_headers_len++;
- hdr->hdr.flags = 0;
- hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
- hdr->num_buffers = 1; //This is local, no need to check
-
- or_flags = (b0->flags & VNET_BUFFER_F_OFFLOAD);
-
- /* Guest supports csum offload and buffer requires checksum offload? */
- if (or_flags
- && (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM)))
- vhost_user_handle_tx_offload (vui, b0, &hdr->hdr);
-
- // Prepare a copy order executed later for the header
- ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
- vhost_copy_t *cpy = &cpu->copy[copy_len];
- copy_len++;
- cpy->len = vui->virtio_net_hdr_sz;
- cpy->dst = buffer_map_addr;
- cpy->src = (uword) hdr;
- }
-
- buffer_map_addr += vui->virtio_net_hdr_sz;
- buffer_len -= vui->virtio_net_hdr_sz;
- bytes_left = b0->current_length;
- current_b0 = b0;
- while (1)
- {
- if (buffer_len == 0)
- { //Get new output
- if (desc_table[desc_index].flags & VRING_DESC_F_NEXT)
- {
- //Next one is chained
- desc_index = desc_table[desc_index].next;
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
- }
- else if (vui->virtio_net_hdr_sz == 12) //MRG is available
- {
- vnet_virtio_net_hdr_mrg_rxbuf_t *hdr =
- &cpu->tx_headers[tx_headers_len - 1];
-
- //Move from available to used buffer
- rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id =
- desc_head;
- rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len =
- desc_len;
- vhost_user_log_dirty_ring (vui, rxvq,
- ring[rxvq->last_used_idx &
- rxvq->qsz_mask]);
-
- rxvq->last_avail_idx++;
- rxvq->last_used_idx++;
- hdr->num_buffers++;
- desc_len = 0;
-
- if (PREDICT_FALSE
- (rxvq->last_avail_idx == rxvq->avail->idx))
- {
- //Dequeue queued descriptors for this packet
- rxvq->last_used_idx -= hdr->num_buffers - 1;
- rxvq->last_avail_idx -= hdr->num_buffers - 1;
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF;
- goto done;
- }
-
- desc_table = rxvq->desc;
- desc_head = desc_index =
- rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask];
- if (PREDICT_FALSE
- (rxvq->desc[desc_head].flags & VRING_DESC_F_INDIRECT))
- {
- //It is seriously unlikely that a driver will put indirect descriptor
- //after non-indirect descriptor.
- if (PREDICT_FALSE (rxvq->desc[desc_head].len <
- sizeof (vnet_virtio_vring_desc_t)))
- {
- error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW;
- goto done;
- }
- if (PREDICT_FALSE
- (!(desc_table =
- map_guest_mem (vui,
- rxvq->desc[desc_index].addr,
- &map_hint))))
- {
- error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL;
- goto done;
- }
- desc_index = 0;
- }
- buffer_map_addr = desc_table[desc_index].addr;
- buffer_len = desc_table[desc_index].len;
- }
- else
- {
- error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG;
- goto done;
- }
- }
-
- {
- ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
- vhost_copy_t *cpy = &cpu->copy[copy_len];
- copy_len++;
- cpy->len = bytes_left;
- cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len;
- cpy->dst = buffer_map_addr;
- cpy->src = (uword) vlib_buffer_get_current (current_b0) +
- current_b0->current_length - bytes_left;
-
- bytes_left -= cpy->len;
- buffer_len -= cpy->len;
- buffer_map_addr += cpy->len;
- desc_len += cpy->len;
-
- clib_prefetch_load (&rxvq->desc);
- }
-
- // Check if vlib buffer has more data. If not, get more or break.
- if (PREDICT_TRUE (!bytes_left))
- {
- if (PREDICT_FALSE
- (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT))
- {
- current_b0 = vlib_get_buffer (vm, current_b0->next_buffer);
- bytes_left = current_b0->current_length;
- }
- else
- {
- //End of packet
- break;
- }
- }
- }
-
- //Move from available to used ring
- rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = desc_head;
- rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = desc_len;
- vhost_user_log_dirty_ring (vui, rxvq,
- ring[rxvq->last_used_idx & rxvq->qsz_mask]);
- rxvq->last_avail_idx++;
- rxvq->last_used_idx++;
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- cpu->current_trace->hdr = cpu->tx_headers[tx_headers_len - 1];
- }
-
- n_left--; //At the end for error counting when 'goto done' is invoked
-
- /*
- * Do the copy periodically to prevent
- * cpu->copy array overflow and corrupt memory
- */
- if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD))
- {
- if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len,
- &map_hint)))
- {
- vlib_error_count (vm, node->node_index,
- VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1);
- }
- copy_len = 0;
-
- /* give buffers back to driver */
- CLIB_MEMORY_BARRIER ();
- rxvq->used->idx = rxvq->last_used_idx;
- vhost_user_log_dirty_ring (vui, rxvq, idx);
- }
- buffers++;
- }
-
-done:
- //Do the memory copies
- if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len,
- &map_hint)))
- {
- vlib_error_count (vm, node->node_index,
- VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1);
- }
-
- CLIB_MEMORY_BARRIER ();
- rxvq->used->idx = rxvq->last_used_idx;
- vhost_user_log_dirty_ring (vui, rxvq, idx);
-
- /*
- * When n_left is set, error is always set to something too.
- * In case error is due to lack of remaining buffers, we go back up and
- * retry.
- * The idea is that it is better to waste some time on packets
- * that have been processed already than dropping them and get
- * more fresh packets with a good likelihood that they will be dropped too.
- * This technique also gives more time to VM driver to pick-up packets.
- * In case the traffic flows from physical to virtual interfaces, this
- * technique will end-up leveraging the physical NIC buffer in order to
- * absorb the VM's CPU jitter.
- */
- if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry)
- {
- retry--;
- goto retry;
- }
-
- /* interrupt (call) handling */
- if ((rxvq->callfd_idx != ~0) &&
- !(rxvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- {
- rxvq->n_since_last_int += frame->n_vectors - n_left;
-
- if (rxvq->n_since_last_int > vum->coalesce_frames)
- vhost_user_send_call (vm, vui, rxvq);
- }
-
- clib_spinlock_unlock (&rxvq->vring_lock);
-
-done3:
- if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE))
- {
- vlib_error_count (vm, node->node_index, error, n_left);
- vlib_increment_simple_counter
- (vnet_main.interface_main.sw_if_counters
- + VNET_INTERFACE_COUNTER_DROP,
- thread_index, vui->sw_if_index, n_left);
- }
-
- vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
- return frame->n_vectors;
-}
-
-static __clib_unused clib_error_t *
-vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index,
- u32 qid, vnet_hw_if_rx_mode mode)
-{
- vlib_main_t *vm = vnm->vlib_main;
- vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index);
- vhost_user_main_t *vum = &vhost_user_main;
- vhost_user_intf_t *vui =
- pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance);
- vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
- vhost_cpu_t *cpu;
-
- if (mode == txvq->mode)
- return 0;
-
- if ((mode != VNET_HW_IF_RX_MODE_POLLING) &&
- (mode != VNET_HW_IF_RX_MODE_ADAPTIVE) &&
- (mode != VNET_HW_IF_RX_MODE_INTERRUPT))
- {
- vu_log_err (vui, "unhandled mode %d changed for if %d queue %d", mode,
- hw_if_index, qid);
- return clib_error_return (0, "unsupported");
- }
-
- if (txvq->thread_index == ~0)
- return clib_error_return (0, "Queue initialization is not finished yet");
-
- cpu = vec_elt_at_index (vum->cpus, txvq->thread_index);
- if ((mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
- (mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
- {
- if (txvq->kickfd_idx == ~0)
- {
- // We cannot support interrupt mode if the driver opts out
- return clib_error_return (0, "Driver does not support interrupt");
- }
- if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING)
- {
- ASSERT (cpu->polling_q_count != 0);
- if (cpu->polling_q_count)
- cpu->polling_q_count--;
- vum->ifq_count++;
- // Start the timer if this is the first encounter on interrupt
- // interface/queue
- if ((vum->ifq_count == 1) &&
- ((vum->coalesce_time > 0.0) || (vum->coalesce_frames > 0)))
- vlib_process_signal_event (vm,
- vhost_user_send_interrupt_node.index,
- VHOST_USER_EVENT_START_TIMER, 0);
- }
- }
- else if (mode == VNET_HW_IF_RX_MODE_POLLING)
- {
- if (((txvq->mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
- (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) && vum->ifq_count)
- {
- cpu->polling_q_count++;
- vum->ifq_count--;
- // Stop the timer if there is no more interrupt interface/queue
- if (vum->ifq_count == 0)
- vlib_process_signal_event (vm,
- vhost_user_send_interrupt_node.index,
- VHOST_USER_EVENT_STOP_TIMER, 0);
- }
- }
-
- txvq->mode = mode;
- vhost_user_set_operation_mode (vui, txvq);
-
- return 0;
-}
-
-static __clib_unused clib_error_t *
-vhost_user_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
- u32 flags)
-{
- vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index);
- vhost_user_main_t *vum = &vhost_user_main;
- vhost_user_intf_t *vui =
- pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance);
- u8 link_old, link_new;
-
- link_old = vui_is_link_up (vui);
-
- vui->admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
-
- link_new = vui_is_link_up (vui);
-
- if (link_old != link_new)
- vnet_hw_interface_set_flags (vnm, vui->hw_if_index, link_new ?
- VNET_HW_INTERFACE_FLAG_LINK_UP : 0);
-
- return /* no error */ 0;
-}
-
-/* *INDENT-OFF* */
-VNET_DEVICE_CLASS (vhost_user_device_class) = {
- .name = "vhost-user",
- .tx_function_n_errors = VHOST_USER_TX_FUNC_N_ERROR,
- .tx_function_error_strings = vhost_user_tx_func_error_strings,
- .format_device_name = format_vhost_user_interface_name,
- .name_renumber = vhost_user_name_renumber,
- .admin_up_down_function = vhost_user_interface_admin_up_down,
- .rx_mode_change_function = vhost_user_interface_rx_mode_change,
- .format_tx_trace = format_vhost_trace,
-};
-
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
Code Review / vpp.git / blobdiff