diff options
Diffstat (limited to 'src/vnet/devices/virtio/vhost_user_input.c')
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_input.c | 1474 |
1 files changed, 0 insertions, 1474 deletions
diff --git a/src/vnet/devices/virtio/vhost_user_input.c b/src/vnet/devices/virtio/vhost_user_input.c deleted file mode 100644 index 841a9798212..00000000000 --- a/src/vnet/devices/virtio/vhost_user_input.c +++ /dev/null @@ -1,1474 +0,0 @@ -/* - *------------------------------------------------------------------ - * vhost-user-input - * - * 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 <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/udp/udp_packet.h> -#include <vnet/tcp/tcp_packet.h> -#include <vnet/interface/rx_queue_funcs.h> - -#include <vnet/devices/virtio/vhost_user.h> -#include <vnet/devices/virtio/vhost_user_inline.h> - -#include <vnet/ip/ip4_packet.h> -#include <vnet/ip/ip6_packet.h> - -/* - * When an RX queue is down but active, received packets - * must be discarded. This value controls up to how many - * packets will be discarded during each round. - */ -#define VHOST_USER_DOWN_DISCARD_COUNT 256 - -/* - * When the number of available buffers gets under this threshold, - * RX node will start discarding packets. - */ -#define VHOST_USER_RX_BUFFER_STARVATION 32 - -/* - * On the receive side, the host should free descriptors as soon - * as possible in order to avoid TX drop in the VM. - * This value controls the number of copy operations that are stacked - * before copy is done for all and descriptors are given back to - * the guest. - * The value 64 was obtained by testing (48 and 128 were not as good). - */ -#define VHOST_USER_RX_COPY_THRESHOLD 64 - -extern vlib_node_registration_t vhost_user_input_node; - -#define foreach_vhost_user_input_func_error \ - _(NO_ERROR, "no error") \ - _(NO_BUFFER, "no available buffer") \ - _(MMAP_FAIL, "mmap failure") \ - _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \ - _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \ - _(NOT_READY, "vhost interface not ready or down") \ - _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)") - -typedef enum -{ -#define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f, - foreach_vhost_user_input_func_error -#undef _ - VHOST_USER_INPUT_FUNC_N_ERROR, -} vhost_user_input_func_error_t; - -static __clib_unused char *vhost_user_input_func_error_strings[] = { -#define _(n,s) s, - foreach_vhost_user_input_func_error -#undef _ -}; - -static_always_inline void -vhost_user_rx_trace (vhost_trace_t * t, - vhost_user_intf_t * vui, u16 qid, - vlib_buffer_t * b, vhost_user_vring_t * txvq, - u16 last_avail_idx) -{ - vhost_user_main_t *vum = &vhost_user_main; - u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask]; - vnet_virtio_vring_desc_t *hdr_desc = 0; - vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; - u32 hint = 0; - - clib_memset (t, 0, sizeof (*t)); - t->device_index = vui - vum->vhost_user_interfaces; - t->qid = qid; - - hdr_desc = &txvq->desc[desc_current]; - if (txvq->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, txvq->desc[desc_current].addr, &hint); - } - if (txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; - } - if (!(txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) && - !(txvq->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; - - if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; - } - else - { - u32 len = vui->virtio_net_hdr_sz; - memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len); - } -} - -static_always_inline u32 -vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, - u16 copy_len, u32 * map_hint) -{ - void *src0, *src1, *src2, *src3; - if (PREDICT_TRUE (copy_len >= 4)) - { - if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint)))) - return 1; - if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint)))) - return 1; - - while (PREDICT_TRUE (copy_len >= 4)) - { - src0 = src2; - src1 = src3; - - if (PREDICT_FALSE - (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint)))) - return 1; - if (PREDICT_FALSE - (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint)))) - return 1; - - clib_prefetch_load (src2); - clib_prefetch_load (src3); - - clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len); - clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len); - copy_len -= 2; - cpy += 2; - } - } - while (copy_len) - { - if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) - return 1; - clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len); - copy_len -= 1; - cpy += 1; - } - return 0; -} - -/** - * Try to discard packets from the tx ring (VPP RX path). - * Returns the number of discarded packets. - */ -static_always_inline u32 -vhost_user_rx_discard_packet (vlib_main_t * vm, - vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, u32 discard_max) -{ - /* - * On the RX side, each packet corresponds to one descriptor - * (it is the same whether it is a shallow descriptor, chained, or indirect). - * Therefore, discarding a packet is like discarding a descriptor. - */ - u32 discarded_packets = 0; - u32 avail_idx = txvq->avail->idx; - u16 mask = txvq->qsz_mask; - u16 last_avail_idx = txvq->last_avail_idx; - u16 last_used_idx = txvq->last_used_idx; - while (discarded_packets != discard_max) - { - if (avail_idx == last_avail_idx) - goto out; - - u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask]; - last_avail_idx++; - txvq->used->ring[last_used_idx & mask].id = desc_chain_head; - txvq->used->ring[last_used_idx & mask].len = 0; - vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]); - last_used_idx++; - discarded_packets++; - } - -out: - txvq->last_avail_idx = last_avail_idx; - txvq->last_used_idx = last_used_idx; - CLIB_MEMORY_STORE_BARRIER (); - txvq->used->idx = txvq->last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - return discarded_packets; -} - -/* - * In case of overflow, we need to rewind the array of allocated buffers. - */ -static_always_inline void -vhost_user_input_rewind_buffers (vlib_main_t * vm, - vhost_cpu_t * cpu, vlib_buffer_t * b_head) -{ - u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; - vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current); - b_current->current_length = 0; - b_current->flags = 0; - while (b_current != b_head) - { - cpu->rx_buffers_len++; - bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; - b_current = vlib_get_buffer (vm, bi_current); - b_current->current_length = 0; - b_current->flags = 0; - } - cpu->rx_buffers_len++; -} - -static_always_inline void -vhost_user_handle_rx_offload (vlib_buffer_t *b0, u8 *b0_data, - vnet_virtio_net_hdr_t *hdr) -{ - u8 l4_hdr_sz = 0; - u8 l4_proto = 0; - ethernet_header_t *eh = (ethernet_header_t *) b0_data; - u16 ethertype = clib_net_to_host_u16 (eh->type); - u16 l2hdr_sz = sizeof (ethernet_header_t); - vnet_buffer_oflags_t oflags = 0; - - if (ethernet_frame_is_tagged (ethertype)) - { - ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1); - - ethertype = clib_net_to_host_u16 (vlan->type); - l2hdr_sz += sizeof (*vlan); - if (ethertype == ETHERNET_TYPE_VLAN) - { - vlan++; - ethertype = clib_net_to_host_u16 (vlan->type); - l2hdr_sz += sizeof (*vlan); - } - } - vnet_buffer (b0)->l2_hdr_offset = 0; - vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz; - vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start; - b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID | - VNET_BUFFER_F_L3_HDR_OFFSET_VALID | - VNET_BUFFER_F_L4_HDR_OFFSET_VALID); - - if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4)) - { - ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz); - l4_proto = ip4->protocol; - b0->flags |= VNET_BUFFER_F_IS_IP4; - oflags |= VNET_BUFFER_OFFLOAD_F_IP_CKSUM; - } - else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6)) - { - ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz); - l4_proto = ip6->protocol; - b0->flags |= VNET_BUFFER_F_IS_IP6; - } - - if (l4_proto == IP_PROTOCOL_TCP) - { - tcp_header_t *tcp = (tcp_header_t *) - (b0_data + vnet_buffer (b0)->l4_hdr_offset); - l4_hdr_sz = tcp_header_bytes (tcp); - oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM; - } - else if (l4_proto == IP_PROTOCOL_UDP) - { - l4_hdr_sz = sizeof (udp_header_t); - oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM; - } - - if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP) - { - vnet_buffer2 (b0)->gso_size = hdr->gso_size; - vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; - b0->flags |= VNET_BUFFER_F_GSO; - } - else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4) - { - vnet_buffer2 (b0)->gso_size = hdr->gso_size; - vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; - b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4); - } - else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6) - { - vnet_buffer2 (b0)->gso_size = hdr->gso_size; - vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; - b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6); - } - - if (oflags) - vnet_buffer_offload_flags_set (b0, oflags); -} - -static_always_inline void -vhost_user_input_do_interrupt (vlib_main_t * vm, vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, - vhost_user_vring_t * rxvq) -{ - f64 now = vlib_time_now (vm); - - if ((txvq->n_since_last_int) && (txvq->int_deadline < now)) - vhost_user_send_call (vm, vui, txvq); - - if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now)) - vhost_user_send_call (vm, vui, rxvq); -} - -static_always_inline void -vhost_user_input_setup_frame (vlib_main_t * vm, vlib_node_runtime_t * node, - vhost_user_intf_t * vui, - u32 * current_config_index, u32 * next_index, - u32 ** to_next, u32 * n_left_to_next) -{ - vnet_feature_main_t *fm = &feature_main; - u8 feature_arc_idx = fm->device_input_feature_arc_index; - - if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index))) - { - vnet_feature_config_main_t *cm; - cm = &fm->feature_config_mains[feature_arc_idx]; - *current_config_index = vec_elt (cm->config_index_by_sw_if_index, - vui->sw_if_index); - vnet_get_config_data (&cm->config_main, current_config_index, - next_index, 0); - } - - vlib_get_new_next_frame (vm, node, *next_index, *to_next, *n_left_to_next); - - if (*next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT) - { - /* give some hints to ethernet-input */ - vlib_next_frame_t *nf; - vlib_frame_t *f; - ethernet_input_frame_t *ef; - nf = vlib_node_runtime_get_next_frame (vm, node, *next_index); - f = vlib_get_frame (vm, nf->frame); - f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX; - - ef = vlib_frame_scalar_args (f); - ef->sw_if_index = vui->sw_if_index; - ef->hw_if_index = vui->hw_if_index; - vlib_frame_no_append (f); - } -} - -static_always_inline u32 -vhost_user_if_input (vlib_main_t *vm, vhost_user_main_t *vum, - vhost_user_intf_t *vui, u16 qid, - vlib_node_runtime_t *node, u8 enable_csum) -{ - vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; - vnet_feature_main_t *fm = &feature_main; - u16 n_rx_packets = 0; - u32 n_rx_bytes = 0; - u16 n_left; - u32 n_left_to_next, *to_next; - u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - u32 n_trace = vlib_get_trace_count (vm, node); - u32 buffer_data_size = vlib_buffer_get_default_data_size (vm); - u32 map_hint = 0; - vhost_cpu_t *cpu = &vum->cpus[vm->thread_index]; - u16 copy_len = 0; - u8 feature_arc_idx = fm->device_input_feature_arc_index; - u32 current_config_index = ~(u32) 0; - u16 mask = txvq->qsz_mask; - - /* The descriptor table is not ready yet */ - if (PREDICT_FALSE (txvq->avail == 0)) - goto done; - - { - /* do we have pending interrupts ? */ - vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; - vhost_user_input_do_interrupt (vm, vui, txvq, rxvq); - } - - /* - * For adaptive mode, it is optimized to reduce interrupts. - * If the scheduler switches the input node to polling due - * to burst of traffic, we tell the driver no interrupt. - * When the traffic subsides, the scheduler switches the node back to - * interrupt mode. We must tell the driver we want interrupt. - */ - if (PREDICT_FALSE (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) - { - if ((node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || - !(node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) - /* Tell driver we want notification */ - txvq->used->flags = 0; - else - /* Tell driver we don't want notification */ - txvq->used->flags = VRING_USED_F_NO_NOTIFY; - } - - if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE)) - goto done; - - n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx); - - /* nothing to do */ - if (PREDICT_FALSE (n_left == 0)) - goto done; - - if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled))) - { - /* - * Discard input packet if interface is admin down or vring is not - * enabled. - * "For example, for a networking device, in the disabled state - * client must not supply any new RX packets, but must process - * and discard any TX packets." - */ - vhost_user_rx_discard_packet (vm, vui, txvq, - VHOST_USER_DOWN_DISCARD_COUNT); - goto done; - } - - if (PREDICT_FALSE (n_left == (mask + 1))) - { - /* - * Informational error logging when VPP is not - * receiving packets fast enough. - */ - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1); - } - - if (n_left > VLIB_FRAME_SIZE) - n_left = VLIB_FRAME_SIZE; - - /* - * For small packets (<2kB), we will not need more than one vlib buffer - * per packet. In case packets are bigger, we will just yield at some point - * in the loop and come back later. This is not an issue as for big packet, - * processing cost really comes from the memory copy. - * The assumption is that big packets will fit in 40 buffers. - */ - if (PREDICT_FALSE (cpu->rx_buffers_len < n_left + 1 || - cpu->rx_buffers_len < 40)) - { - u32 curr_len = cpu->rx_buffers_len; - cpu->rx_buffers_len += - vlib_buffer_alloc (vm, cpu->rx_buffers + curr_len, - VHOST_USER_RX_BUFFERS_N - curr_len); - - if (PREDICT_FALSE - (cpu->rx_buffers_len < VHOST_USER_RX_BUFFER_STARVATION)) - { - /* In case of buffer starvation, discard some packets from the queue - * and log the event. - * We keep doing best effort for the remaining packets. */ - u32 flush = (n_left + 1 > cpu->rx_buffers_len) ? - n_left + 1 - cpu->rx_buffers_len : 1; - flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush); - - n_left -= flush; - vlib_increment_simple_counter (vnet_main. - interface_main.sw_if_counters + - VNET_INTERFACE_COUNTER_DROP, - vm->thread_index, vui->sw_if_index, - flush); - - vlib_error_count (vm, vhost_user_input_node.index, - VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush); - } - } - - vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index, - &next_index, &to_next, &n_left_to_next); - - u16 last_avail_idx = txvq->last_avail_idx; - u16 last_used_idx = txvq->last_used_idx; - - while (n_left > 0) - { - vlib_buffer_t *b_head, *b_current; - u32 bi_current; - u16 desc_current; - u32 desc_data_offset; - vnet_virtio_vring_desc_t *desc_table = txvq->desc; - - if (PREDICT_FALSE (cpu->rx_buffers_len <= 1)) - { - /* Not enough rx_buffers - * Note: We yeld on 1 so we don't need to do an additional - * check for the next buffer prefetch. - */ - n_left = 0; - break; - } - - desc_current = txvq->avail->ring[last_avail_idx & mask]; - cpu->rx_buffers_len--; - bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; - b_head = b_current = vlib_get_buffer (vm, bi_current); - to_next[0] = bi_current; //We do that now so we can forget about bi_current - to_next++; - n_left_to_next--; - - vlib_prefetch_buffer_with_index - (vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD); - - /* Just preset the used descriptor id and length for later */ - txvq->used->ring[last_used_idx & mask].id = desc_current; - txvq->used->ring[last_used_idx & mask].len = 0; - vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]); - - /* The buffer should already be initialized */ - b_head->total_length_not_including_first_buffer = 0; - b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - - if (PREDICT_FALSE - (n_trace > 0 && vlib_trace_buffer (vm, node, next_index, b_head, - /* follow_chain */ 0))) - { - vhost_trace_t *t0 = - vlib_add_trace (vm, node, b_head, sizeof (t0[0])); - vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx); - n_trace--; - vlib_set_trace_count (vm, node, n_trace); - } - - /* This depends on the setup but is very consistent - * So I think the CPU branch predictor will make a pretty good job - * at optimizing the decision. */ - if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT) - { - desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr, - &map_hint); - desc_current = 0; - if (PREDICT_FALSE (desc_table == 0)) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - goto out; - } - } - - desc_data_offset = vui->virtio_net_hdr_sz; - - if (enable_csum) - { - vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; - u8 *b_data; - u16 current; - - hdr = map_guest_mem (vui, desc_table[desc_current].addr, &map_hint); - if (PREDICT_FALSE (hdr == 0)) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - goto out; - } - if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) - { - if ((desc_data_offset == desc_table[desc_current].len) && - (desc_table[desc_current].flags & VRING_DESC_F_NEXT)) - { - current = desc_table[desc_current].next; - b_data = map_guest_mem (vui, desc_table[current].addr, - &map_hint); - if (PREDICT_FALSE (b_data == 0)) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, - 1); - goto out; - } - } - else - b_data = (u8 *) hdr + desc_data_offset; - - vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); - } - } - - while (1) - { - /* Get more input if necessary. Or end of packet. */ - if (desc_data_offset == desc_table[desc_current].len) - { - if (PREDICT_FALSE (desc_table[desc_current].flags & - VRING_DESC_F_NEXT)) - { - desc_current = desc_table[desc_current].next; - desc_data_offset = 0; - } - else - { - goto out; - } - } - - /* Get more output if necessary. Or end of packet. */ - if (PREDICT_FALSE (b_current->current_length == buffer_data_size)) - { - if (PREDICT_FALSE (cpu->rx_buffers_len == 0)) - { - /* Cancel speculation */ - to_next--; - n_left_to_next++; - - /* - * Checking if there are some left buffers. - * If not, just rewind the used buffers and stop. - * Note: Scheduled copies are not cancelled. This is - * not an issue as they would still be valid. Useless, - * but valid. - */ - vhost_user_input_rewind_buffers (vm, cpu, b_head); - n_left = 0; - goto stop; - } - - /* Get next output */ - cpu->rx_buffers_len--; - u32 bi_next = cpu->rx_buffers[cpu->rx_buffers_len]; - b_current->next_buffer = bi_next; - b_current->flags |= VLIB_BUFFER_NEXT_PRESENT; - bi_current = bi_next; - b_current = vlib_get_buffer (vm, bi_current); - } - - /* Prepare a copy order executed later for the data */ - ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); - vhost_copy_t *cpy = &cpu->copy[copy_len]; - copy_len++; - u32 desc_data_l = desc_table[desc_current].len - desc_data_offset; - cpy->len = buffer_data_size - b_current->current_length; - cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; - cpy->dst = (uword) (vlib_buffer_get_current (b_current) + - b_current->current_length); - cpy->src = desc_table[desc_current].addr + desc_data_offset; - - desc_data_offset += cpy->len; - - b_current->current_length += cpy->len; - b_head->total_length_not_including_first_buffer += cpy->len; - } - - out: - - n_rx_bytes += b_head->total_length_not_including_first_buffer; - n_rx_packets++; - - b_head->total_length_not_including_first_buffer -= - b_head->current_length; - - /* consume the descriptor and return it as used */ - last_avail_idx++; - last_used_idx++; - - vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; - vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0; - b_head->error = 0; - - if (current_config_index != ~(u32) 0) - { - b_head->current_config_index = current_config_index; - vnet_buffer (b_head)->feature_arc_index = feature_arc_idx; - } - - n_left--; - - /* - * Although separating memory copies from virtio ring parsing - * is beneficial, we can offer to perform the copies from time - * to time in order to free some space in the ring. - */ - if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) - { - if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, - copy_len, &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - } - copy_len = 0; - - /* give buffers back to driver */ - CLIB_MEMORY_STORE_BARRIER (); - txvq->used->idx = last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - } - } -stop: - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - - txvq->last_used_idx = last_used_idx; - txvq->last_avail_idx = last_avail_idx; - - /* Do the memory copies */ - if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len, - &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - } - - /* give buffers back to driver */ - CLIB_MEMORY_STORE_BARRIER (); - txvq->used->idx = txvq->last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - - /* interrupt (call) handling */ - if ((txvq->callfd_idx != ~0) && - !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) - { - txvq->n_since_last_int += n_rx_packets; - - if (txvq->n_since_last_int > vum->coalesce_frames) - vhost_user_send_call (vm, vui, txvq); - } - - /* increase rx counters */ - vlib_increment_combined_counter - (vnet_main.interface_main.combined_sw_if_counters - + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index, - n_rx_packets, n_rx_bytes); - - vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets); - -done: - return n_rx_packets; -} - -static_always_inline void -vhost_user_mark_desc_consumed (vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, u16 desc_head, - u16 n_descs_processed) -{ - vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; - u16 desc_idx; - u16 mask = txvq->qsz_mask; - - for (desc_idx = 0; desc_idx < n_descs_processed; desc_idx++) - { - if (txvq->used_wrap_counter) - desc_table[(desc_head + desc_idx) & mask].flags |= - (VRING_DESC_F_AVAIL | VRING_DESC_F_USED); - else - desc_table[(desc_head + desc_idx) & mask].flags &= - ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED); - vhost_user_advance_last_used_idx (txvq); - } -} - -static_always_inline void -vhost_user_rx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui, - u16 qid, vhost_user_vring_t * txvq, - u16 desc_current) -{ - vhost_user_main_t *vum = &vhost_user_main; - vnet_virtio_vring_packed_desc_t *hdr_desc; - vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; - u32 hint = 0; - - clib_memset (t, 0, sizeof (*t)); - t->device_index = vui - vum->vhost_user_interfaces; - t->qid = qid; - - hdr_desc = &txvq->packed_desc[desc_current]; - if (txvq->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, txvq->packed_desc[desc_current].addr, - &hint); - } - if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; - - if (!(txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) && - !(txvq->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; - - if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; - else - { - u32 len = vui->virtio_net_hdr_sz; - clib_memcpy_fast (&t->hdr, hdr, - len > hdr_desc->len ? hdr_desc->len : len); - } -} - -static_always_inline u32 -vhost_user_rx_discard_packet_packed (vlib_main_t * vm, - vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, - u32 discard_max) -{ - u32 discarded_packets = 0; - u16 mask = txvq->qsz_mask; - u16 desc_current, desc_head; - - desc_head = desc_current = txvq->last_used_idx & mask; - - /* - * On the RX side, each packet corresponds to one descriptor - * (it is the same whether it is a shallow descriptor, chained, or indirect). - * Therefore, discarding a packet is like discarding a descriptor. - */ - while ((discarded_packets != discard_max) && - vhost_user_packed_desc_available (txvq, desc_current)) - { - vhost_user_advance_last_avail_idx (txvq); - discarded_packets++; - desc_current = (desc_current + 1) & mask; - } - - if (PREDICT_TRUE (discarded_packets)) - vhost_user_mark_desc_consumed (vui, txvq, desc_head, discarded_packets); - return (discarded_packets); -} - -static_always_inline u32 -vhost_user_input_copy_packed (vhost_user_intf_t * vui, vhost_copy_t * cpy, - u16 copy_len, u32 * map_hint) -{ - void *src0, *src1, *src2, *src3, *src4, *src5, *src6, *src7; - u8 bad; - u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR; - - if (PREDICT_TRUE (copy_len >= 8)) - { - src4 = map_guest_mem (vui, cpy[0].src, map_hint); - src5 = map_guest_mem (vui, cpy[1].src, map_hint); - src6 = map_guest_mem (vui, cpy[2].src, map_hint); - src7 = map_guest_mem (vui, cpy[3].src, map_hint); - bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0); - if (PREDICT_FALSE (bad)) - goto one_by_one; - clib_prefetch_load (src4); - clib_prefetch_load (src5); - clib_prefetch_load (src6); - clib_prefetch_load (src7); - - while (PREDICT_TRUE (copy_len >= 8)) - { - src0 = src4; - src1 = src5; - src2 = src6; - src3 = src7; - - src4 = map_guest_mem (vui, cpy[4].src, map_hint); - src5 = map_guest_mem (vui, cpy[5].src, map_hint); - src6 = map_guest_mem (vui, cpy[6].src, map_hint); - src7 = map_guest_mem (vui, cpy[7].src, map_hint); - bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0); - if (PREDICT_FALSE (bad)) - break; - - clib_prefetch_load (src4); - clib_prefetch_load (src5); - clib_prefetch_load (src6); - clib_prefetch_load (src7); - - clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len); - clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len); - clib_memcpy_fast ((void *) cpy[2].dst, src2, cpy[2].len); - clib_memcpy_fast ((void *) cpy[3].dst, src3, cpy[3].len); - copy_len -= 4; - cpy += 4; - } - } - -one_by_one: - while (copy_len) - { - if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) - { - rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; - break; - } - clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len); - copy_len -= 1; - cpy += 1; - } - return rc; -} - -static_always_inline u32 -vhost_user_do_offload (vhost_user_intf_t *vui, - vnet_virtio_vring_packed_desc_t *desc_table, - u16 desc_current, u16 mask, vlib_buffer_t *b_head, - u32 *map_hint) -{ - u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR; - vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; - u8 *b_data; - u32 desc_data_offset = vui->virtio_net_hdr_sz; - - hdr = map_guest_mem (vui, desc_table[desc_current].addr, map_hint); - if (PREDICT_FALSE (hdr == 0)) - rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; - else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) - { - if (desc_data_offset == desc_table[desc_current].len) - { - desc_current = (desc_current + 1) & mask; - b_data = - map_guest_mem (vui, desc_table[desc_current].addr, map_hint); - if (PREDICT_FALSE (b_data == 0)) - rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; - else - vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); - } - else - { - b_data = (u8 *) hdr + desc_data_offset; - vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); - } - } - - return rc; -} - -static_always_inline u32 -vhost_user_compute_buffers_required (u32 desc_len, u32 buffer_data_size) -{ - div_t result; - u32 buffers_required; - - if (PREDICT_TRUE (buffer_data_size == 2048)) - { - buffers_required = desc_len >> 11; - if ((desc_len & 2047) != 0) - buffers_required++; - return (buffers_required); - } - - if (desc_len < buffer_data_size) - return 1; - - result = div (desc_len, buffer_data_size); - if (result.rem) - buffers_required = result.quot + 1; - else - buffers_required = result.quot; - - return (buffers_required); -} - -static_always_inline u32 -vhost_user_compute_indirect_desc_len (vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, - u32 buffer_data_size, u16 desc_current, - u32 * map_hint) -{ - vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; - u32 desc_len = 0; - u16 desc_data_offset = vui->virtio_net_hdr_sz; - u16 desc_idx = desc_current; - u32 n_descs; - - n_descs = desc_table[desc_idx].len >> 4; - desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, map_hint); - if (PREDICT_FALSE (desc_table == 0)) - return 0; - - for (desc_idx = 0; desc_idx < n_descs; desc_idx++) - desc_len += desc_table[desc_idx].len; - - if (PREDICT_TRUE (desc_len > desc_data_offset)) - desc_len -= desc_data_offset; - - return vhost_user_compute_buffers_required (desc_len, buffer_data_size); -} - -static_always_inline u32 -vhost_user_compute_chained_desc_len (vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, - u32 buffer_data_size, u16 * current, - u16 * n_left) -{ - vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; - u32 desc_len = 0; - u16 mask = txvq->qsz_mask; - - while (desc_table[*current].flags & VRING_DESC_F_NEXT) - { - desc_len += desc_table[*current].len; - (*n_left)++; - *current = (*current + 1) & mask; - vhost_user_advance_last_avail_idx (txvq); - } - desc_len += desc_table[*current].len; - (*n_left)++; - *current = (*current + 1) & mask; - vhost_user_advance_last_avail_idx (txvq); - - if (PREDICT_TRUE (desc_len > vui->virtio_net_hdr_sz)) - desc_len -= vui->virtio_net_hdr_sz; - - return vhost_user_compute_buffers_required (desc_len, buffer_data_size); -} - -static_always_inline void -vhost_user_assemble_packet (vnet_virtio_vring_packed_desc_t *desc_table, - u16 *desc_idx, vlib_buffer_t *b_head, - vlib_buffer_t **b_current, u32 **next, - vlib_buffer_t ***b, u32 *bi_current, - vhost_cpu_t *cpu, u16 *copy_len, u32 *buffers_used, - u32 buffers_required, u32 *desc_data_offset, - u32 buffer_data_size, u16 mask) -{ - u32 desc_data_l; - - while (*desc_data_offset < desc_table[*desc_idx].len) - { - /* Get more output if necessary. Or end of packet. */ - if (PREDICT_FALSE ((*b_current)->current_length == buffer_data_size)) - { - /* Get next output */ - u32 bi_next = **next; - (*next)++; - (*b_current)->next_buffer = bi_next; - (*b_current)->flags |= VLIB_BUFFER_NEXT_PRESENT; - *bi_current = bi_next; - *b_current = **b; - (*b)++; - (*buffers_used)++; - ASSERT (*buffers_used <= buffers_required); - } - - /* Prepare a copy order executed later for the data */ - ASSERT (*copy_len < VHOST_USER_COPY_ARRAY_N); - vhost_copy_t *cpy = &cpu->copy[*copy_len]; - (*copy_len)++; - desc_data_l = desc_table[*desc_idx].len - *desc_data_offset; - cpy->len = buffer_data_size - (*b_current)->current_length; - cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; - cpy->dst = (uword) (vlib_buffer_get_current (*b_current) + - (*b_current)->current_length); - cpy->src = desc_table[*desc_idx].addr + *desc_data_offset; - - *desc_data_offset += cpy->len; - - (*b_current)->current_length += cpy->len; - b_head->total_length_not_including_first_buffer += cpy->len; - } - *desc_idx = (*desc_idx + 1) & mask;; - *desc_data_offset = 0; -} - -static_always_inline u32 -vhost_user_if_input_packed (vlib_main_t *vm, vhost_user_main_t *vum, - vhost_user_intf_t *vui, u16 qid, - vlib_node_runtime_t *node, u8 enable_csum) -{ - vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; - vnet_feature_main_t *fm = &feature_main; - u8 feature_arc_idx = fm->device_input_feature_arc_index; - u16 n_rx_packets = 0; - u32 n_rx_bytes = 0; - u16 n_left = 0; - u32 buffers_required = 0; - u32 n_left_to_next, *to_next; - u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - u32 n_trace = vlib_get_trace_count (vm, node); - u32 buffer_data_size = vlib_buffer_get_default_data_size (vm); - u32 map_hint = 0; - vhost_cpu_t *cpu = &vum->cpus[vm->thread_index]; - u16 copy_len = 0; - u32 current_config_index = ~0; - u16 mask = txvq->qsz_mask; - u16 desc_current, desc_head, last_used_idx; - vnet_virtio_vring_packed_desc_t *desc_table = 0; - u32 n_descs_processed = 0; - u32 rv; - vlib_buffer_t **b; - u32 *next; - u32 buffers_used = 0; - u16 current, n_descs_to_process; - - /* The descriptor table is not ready yet */ - if (PREDICT_FALSE (txvq->packed_desc == 0)) - goto done; - - /* do we have pending interrupts ? */ - vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; - vhost_user_input_do_interrupt (vm, vui, txvq, rxvq); - - /* - * For adaptive mode, it is optimized to reduce interrupts. - * If the scheduler switches the input node to polling due - * to burst of traffic, we tell the driver no interrupt. - * When the traffic subsides, the scheduler switches the node back to - * interrupt mode. We must tell the driver we want interrupt. - */ - if (PREDICT_FALSE (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) - { - if ((node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || - !(node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) - /* Tell driver we want notification */ - txvq->used_event->flags = 0; - else - /* Tell driver we don't want notification */ - txvq->used_event->flags = VRING_EVENT_F_DISABLE; - } - - last_used_idx = txvq->last_used_idx & mask; - desc_head = desc_current = last_used_idx; - - if (vhost_user_packed_desc_available (txvq, desc_current) == 0) - goto done; - - if (PREDICT_FALSE (!vui->admin_up || !vui->is_ready || !(txvq->enabled))) - { - /* - * Discard input packet if interface is admin down or vring is not - * enabled. - * "For example, for a networking device, in the disabled state - * client must not supply any new RX packets, but must process - * and discard any TX packets." - */ - rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, - VHOST_USER_DOWN_DISCARD_COUNT); - vlib_error_count (vm, vhost_user_input_node.index, - VHOST_USER_INPUT_FUNC_ERROR_NOT_READY, rv); - goto done; - } - - vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index, - &next_index, &to_next, &n_left_to_next); - - /* - * Compute n_left and total buffers needed - */ - desc_table = txvq->packed_desc; - current = desc_current; - while (vhost_user_packed_desc_available (txvq, current) && - (n_left < VLIB_FRAME_SIZE)) - { - if (desc_table[current].flags & VRING_DESC_F_INDIRECT) - { - buffers_required += - vhost_user_compute_indirect_desc_len (vui, txvq, buffer_data_size, - current, &map_hint); - n_left++; - current = (current + 1) & mask; - vhost_user_advance_last_avail_idx (txvq); - } - else - { - buffers_required += - vhost_user_compute_chained_desc_len (vui, txvq, buffer_data_size, - ¤t, &n_left); - } - } - - /* Something is broken if we need more than 10000 buffers */ - if (PREDICT_FALSE ((buffers_required == 0) || (buffers_required > 10000))) - { - rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left); - vlib_error_count (vm, vhost_user_input_node.index, - VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv); - goto done; - } - - vec_validate (cpu->to_next_list, buffers_required); - rv = vlib_buffer_alloc (vm, cpu->to_next_list, buffers_required); - if (PREDICT_FALSE (rv != buffers_required)) - { - vlib_buffer_free (vm, cpu->to_next_list, rv); - rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left); - vlib_error_count (vm, vhost_user_input_node.index, - VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv); - goto done; - } - - next = cpu->to_next_list; - vec_validate (cpu->rx_buffers_pdesc, buffers_required); - vlib_get_buffers (vm, next, cpu->rx_buffers_pdesc, buffers_required); - b = cpu->rx_buffers_pdesc; - n_descs_processed = n_left; - - while (n_left) - { - vlib_buffer_t *b_head, *b_current; - u32 bi_current; - u32 desc_data_offset; - u16 desc_idx = desc_current; - u32 n_descs; - - desc_table = txvq->packed_desc; - to_next[0] = bi_current = next[0]; - b_head = b_current = b[0]; - b++; - buffers_used++; - ASSERT (buffers_used <= buffers_required); - to_next++; - next++; - n_left_to_next--; - - /* The buffer should already be initialized */ - b_head->total_length_not_including_first_buffer = 0; - b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - desc_data_offset = vui->virtio_net_hdr_sz; - n_descs_to_process = 1; - - if (desc_table[desc_idx].flags & VRING_DESC_F_INDIRECT) - { - n_descs = desc_table[desc_idx].len >> 4; - desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, - &map_hint); - desc_idx = 0; - if (PREDICT_FALSE (desc_table == 0) || - (enable_csum && - (PREDICT_FALSE - (vhost_user_do_offload - (vui, desc_table, desc_idx, mask, b_head, - &map_hint) != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - to_next--; - next--; - n_left_to_next++; - buffers_used--; - b--; - goto out; - } - while (n_descs) - { - vhost_user_assemble_packet (desc_table, &desc_idx, b_head, - &b_current, &next, &b, &bi_current, - cpu, ©_len, &buffers_used, - buffers_required, &desc_data_offset, - buffer_data_size, mask); - n_descs--; - } - } - else - { - if (enable_csum) - { - rv = vhost_user_do_offload (vui, desc_table, desc_idx, mask, - b_head, &map_hint); - if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) - { - vlib_error_count (vm, node->node_index, rv, 1); - to_next--; - next--; - n_left_to_next++; - buffers_used--; - b--; - goto out; - } - } - /* - * For chained descriptor, we process all chains in a single while - * loop. So count how many descriptors in the chain. - */ - n_descs_to_process = 1; - while (desc_table[desc_idx].flags & VRING_DESC_F_NEXT) - { - vhost_user_assemble_packet (desc_table, &desc_idx, b_head, - &b_current, &next, &b, &bi_current, - cpu, ©_len, &buffers_used, - buffers_required, &desc_data_offset, - buffer_data_size, mask); - n_descs_to_process++; - } - vhost_user_assemble_packet (desc_table, &desc_idx, b_head, - &b_current, &next, &b, &bi_current, - cpu, ©_len, &buffers_used, - buffers_required, &desc_data_offset, - buffer_data_size, mask); - } - - n_rx_bytes += b_head->total_length_not_including_first_buffer; - n_rx_packets++; - - b_head->total_length_not_including_first_buffer -= - b_head->current_length; - - vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; - vnet_buffer (b_head)->sw_if_index[VLIB_TX] = ~0; - b_head->error = 0; - - if (current_config_index != ~0) - { - b_head->current_config_index = current_config_index; - vnet_buffer (b_head)->feature_arc_index = feature_arc_idx; - } - - out: - ASSERT (n_left >= n_descs_to_process); - n_left -= n_descs_to_process; - - /* advance to next descrptor */ - desc_current = (desc_current + n_descs_to_process) & mask; - - /* - * Although separating memory copies from virtio ring parsing - * is beneficial, we can offer to perform the copies from time - * to time in order to free some space in the ring. - */ - if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) - { - rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, - &map_hint); - if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) - vlib_error_count (vm, node->node_index, rv, 1); - copy_len = 0; - } - } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - - /* Do the memory copies */ - rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint); - if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) - vlib_error_count (vm, node->node_index, rv, 1); - - /* Must do the tracing before giving buffers back to driver */ - if (PREDICT_FALSE (n_trace)) - { - u32 left = n_rx_packets; - - b = cpu->rx_buffers_pdesc; - while (n_trace && left) - { - if (PREDICT_TRUE - (vlib_trace_buffer - (vm, node, next_index, b[0], /* follow_chain */ 0))) - { - vhost_trace_t *t0; - t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0])); - vhost_user_rx_trace_packed (t0, vui, qid, txvq, last_used_idx); - last_used_idx = (last_used_idx + 1) & mask; - n_trace--; - vlib_set_trace_count (vm, node, n_trace); - } - left--; - b++; - } - } - - /* - * Give buffers back to driver. - */ - vhost_user_mark_desc_consumed (vui, txvq, desc_head, n_descs_processed); - - /* interrupt (call) handling */ - if ((txvq->callfd_idx != ~0) && - (txvq->avail_event->flags != VRING_EVENT_F_DISABLE)) - { - txvq->n_since_last_int += n_rx_packets; - if (txvq->n_since_last_int > vum->coalesce_frames) - vhost_user_send_call (vm, vui, txvq); - } - - /* increase rx counters */ - vlib_increment_combined_counter - (vnet_main.interface_main.combined_sw_if_counters - + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index, - n_rx_packets, n_rx_bytes); - - vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets); - - if (PREDICT_FALSE (buffers_used < buffers_required)) - vlib_buffer_free (vm, next, buffers_required - buffers_used); - -done: - return n_rx_packets; -} - -VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - vhost_user_main_t *vum = &vhost_user_main; - uword n_rx_packets = 0; - vhost_user_intf_t *vui; - vnet_hw_if_rxq_poll_vector_t *pv = vnet_hw_if_get_rxq_poll_vector (vm, node); - vnet_hw_if_rxq_poll_vector_t *pve; - - vec_foreach (pve, pv) - { - vui = pool_elt_at_index (vum->vhost_user_interfaces, pve->dev_instance); - if (vhost_user_is_packed_ring_supported (vui)) - { - if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM)) - n_rx_packets += vhost_user_if_input_packed ( - vm, vum, vui, pve->queue_id, node, 1); - else - n_rx_packets += vhost_user_if_input_packed ( - vm, vum, vui, pve->queue_id, node, 0); - } - else - { - if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM)) - n_rx_packets += - vhost_user_if_input (vm, vum, vui, pve->queue_id, node, 1); - else - n_rx_packets += - vhost_user_if_input (vm, vum, vui, pve->queue_id, node, 0); - } - } - - return n_rx_packets; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (vhost_user_input_node) = { - .type = VLIB_NODE_TYPE_INPUT, - .name = "vhost-user-input", - .sibling_of = "device-input", - .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED, - - /* Will be enabled if/when hardware is detected. */ - .state = VLIB_NODE_STATE_DISABLED, - - .format_buffer = format_ethernet_header_with_length, - .format_trace = format_vhost_trace, - - .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR, - .error_strings = vhost_user_input_func_error_strings, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |