diff options
author | 2022-10-19 12:46:29 -0700 | |
---|---|---|
committer | 2022-12-02 13:43:11 +0000 | |
commit | 7eba44d1ec54982636f830a4859027218ca56832 (patch) | |
tree | 6447cda45a430c8a735b92be2b13b41b18e1f8a1 /src/vnet/devices/virtio/vhost_user_output.c | |
parent | a6d16b71308f1badf4b362d26d2326a2977fe462 (diff) |
vhost: convert vhost device driver to a plugin
convert vhost device driver to a plugin as described in
https://jira.fd.io/browse/VPP-2065
Type: improvement
Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: Ibfe2f351bcaed36a04b136d082ae414145dd37b5
Diffstat (limited to 'src/vnet/devices/virtio/vhost_user_output.c')
-rw-r--r-- | src/vnet/devices/virtio/vhost_user_output.c | 1145 |
1 files changed, 0 insertions, 1145 deletions
diff --git a/src/vnet/devices/virtio/vhost_user_output.c b/src/vnet/devices/virtio/vhost_user_output.c deleted file mode 100644 index 3b7bf97c3f8..00000000000 --- a/src/vnet/devices/virtio/vhost_user_output.c +++ /dev/null @@ -1,1145 +0,0 @@ -/* - *------------------------------------------------------------------ - * 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: - */ |