| /* |
| *------------------------------------------------------------------ |
| * Copyright (c) 2016 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| *------------------------------------------------------------------ |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| |
| #include <vlib/vlib.h> |
| #include <vlib/unix/unix.h> |
| #include <vnet/vnet.h> |
| #include <vnet/ethernet/ethernet.h> |
| #include <vnet/gso/gro_func.h> |
| #include <vnet/gso/hdr_offset_parser.h> |
| #include <vnet/ip/ip4_packet.h> |
| #include <vnet/ip/ip6_packet.h> |
| #include <vnet/tcp/tcp_packet.h> |
| #include <vnet/udp/udp_packet.h> |
| #include <vnet/devices/virtio/virtio.h> |
| |
| #define foreach_virtio_tx_func_error \ |
| _(NO_FREE_SLOTS, "no free tx slots") \ |
| _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \ |
| _(PENDING_MSGS, "pending msgs in tx ring") \ |
| _(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \ |
| _(OUT_OF_ORDER, "out-of-order buffers in used ring") \ |
| _(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \ |
| _(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop") |
| |
| typedef enum |
| { |
| #define _(f,s) VIRTIO_TX_ERROR_##f, |
| foreach_virtio_tx_func_error |
| #undef _ |
| VIRTIO_TX_N_ERROR, |
| } virtio_tx_func_error_t; |
| |
| static char *virtio_tx_func_error_strings[] = { |
| #define _(n,s) s, |
| foreach_virtio_tx_func_error |
| #undef _ |
| }; |
| |
| static u8 * |
| format_virtio_device (u8 * s, va_list * args) |
| { |
| u32 dev_instance = va_arg (*args, u32); |
| int verbose = va_arg (*args, int); |
| u32 indent = format_get_indent (s); |
| |
| s = format (s, "VIRTIO interface"); |
| if (verbose) |
| { |
| s = format (s, "\n%U instance %u", format_white_space, indent + 2, |
| dev_instance); |
| } |
| return s; |
| } |
| |
| typedef struct |
| { |
| u32 buffer_index; |
| u32 sw_if_index; |
| vlib_buffer_t buffer; |
| generic_header_offset_t gho; |
| } virtio_tx_trace_t; |
| |
| static u8 * |
| format_virtio_tx_trace (u8 * s, va_list * va) |
| { |
| CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); |
| CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); |
| virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *); |
| u32 indent = format_get_indent (s); |
| |
| s = format (s, "%Ubuffer 0x%x: %U\n", |
| format_white_space, indent, |
| t->buffer_index, format_vnet_buffer, &t->buffer); |
| s = |
| format (s, "%U%U\n", format_white_space, indent, |
| format_generic_header_offset, &t->gho); |
| s = |
| format (s, "%U%U", format_white_space, indent, |
| format_ethernet_header_with_length, t->buffer.pre_data, |
| sizeof (t->buffer.pre_data)); |
| return s; |
| } |
| |
| static_always_inline void |
| virtio_tx_trace (vlib_main_t * vm, vlib_node_runtime_t * node, |
| virtio_if_type_t type, vlib_buffer_t * b0, u32 bi) |
| { |
| virtio_tx_trace_t *t; |
| t = vlib_add_trace (vm, node, b0, sizeof (t[0])); |
| t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; |
| t->buffer_index = bi; |
| if (type == VIRTIO_IF_TYPE_TUN) |
| { |
| int is_ip4 = 0, is_ip6 = 0; |
| |
| switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0) |
| { |
| case 0x40: |
| is_ip4 = 1; |
| break; |
| case 0x60: |
| is_ip6 = 1; |
| break; |
| default: |
| break; |
| } |
| vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6); |
| } |
| else |
| vnet_generic_header_offset_parser (b0, &t->gho, 1, |
| b0->flags & |
| VNET_BUFFER_F_IS_IP4, |
| b0->flags & VNET_BUFFER_F_IS_IP6); |
| |
| clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data)); |
| clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0), |
| sizeof (t->buffer.pre_data)); |
| } |
| |
| static_always_inline void |
| virtio_interface_drop_inline (vlib_main_t * vm, uword node_index, |
| u32 * buffers, u16 n, |
| virtio_tx_func_error_t error) |
| { |
| vlib_error_count (vm, node_index, error, n); |
| vlib_buffer_free (vm, buffers, n); |
| } |
| |
| static_always_inline void |
| virtio_memset_ring_u32 (u32 * ring, u32 start, u32 ring_size, u32 n_buffers) |
| { |
| ASSERT (n_buffers <= ring_size); |
| |
| if (PREDICT_TRUE (start + n_buffers <= ring_size)) |
| { |
| clib_memset_u32 (ring + start, ~0, n_buffers); |
| } |
| else |
| { |
| clib_memset_u32 (ring + start, ~0, ring_size - start); |
| clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start)); |
| } |
| } |
| |
| static_always_inline void |
| virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring, |
| uword node_index) |
| { |
| u16 used = vring->desc_in_use; |
| u16 sz = vring->size; |
| u16 mask = sz - 1; |
| u16 last = vring->last_used_idx; |
| u16 n_left = vring->used->idx - last; |
| u16 out_of_order_count = 0; |
| |
| if (n_left == 0) |
| return; |
| |
| while (n_left) |
| { |
| vring_used_elem_t *e = &vring->used->ring[last & mask]; |
| u16 slot, n_buffers; |
| slot = n_buffers = e->id; |
| |
| while (e->id == (n_buffers & mask)) |
| { |
| n_left--; |
| last++; |
| n_buffers++; |
| vring_desc_t *d = &vring->desc[e->id]; |
| u16 next; |
| while (d->flags & VRING_DESC_F_NEXT) |
| { |
| n_buffers++; |
| next = d->next; |
| d = &vring->desc[next]; |
| } |
| if (n_left == 0) |
| break; |
| e = &vring->used->ring[last & mask]; |
| } |
| vlib_buffer_free_from_ring (vm, vring->buffers, slot, |
| sz, (n_buffers - slot)); |
| virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot)); |
| used -= (n_buffers - slot); |
| |
| if (n_left > 0) |
| { |
| vlib_buffer_free (vm, &vring->buffers[e->id], 1); |
| vring->buffers[e->id] = ~0; |
| used--; |
| last++; |
| n_left--; |
| out_of_order_count++; |
| vring->flags |= VRING_TX_OUT_OF_ORDER; |
| } |
| } |
| |
| /* |
| * Some vhost-backends give buffers back in out-of-order fashion in used ring. |
| * It impacts the overall virtio-performance. |
| */ |
| if (out_of_order_count) |
| vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER, |
| out_of_order_count); |
| |
| vring->desc_in_use = used; |
| vring->last_used_idx = last; |
| } |
| |
| static_always_inline void |
| set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2) |
| { |
| if (b->flags & VNET_BUFFER_F_IS_IP4) |
| { |
| ip4_header_t *ip4; |
| generic_header_offset_t gho = { 0 }; |
| vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ , |
| 0 /* ip6 */ ); |
| hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| hdr->csum_start = gho.l4_hdr_offset; // 0x22; |
| if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) |
| { |
| hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); |
| } |
| else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) |
| { |
| hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); |
| } |
| |
| /* |
| * virtio devices do not support IP4 checksum offload. So driver takes care |
| * of it while doing tx. |
| */ |
| ip4 = |
| (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset); |
| if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) |
| ip4->checksum = ip4_header_checksum (ip4); |
| } |
| else if (b->flags & VNET_BUFFER_F_IS_IP6) |
| { |
| generic_header_offset_t gho = { 0 }; |
| vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ , |
| 1 /* ip6 */ ); |
| hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| hdr->csum_start = gho.l4_hdr_offset; // 0x36; |
| if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) |
| { |
| hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); |
| } |
| else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) |
| { |
| hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); |
| } |
| } |
| } |
| |
| static_always_inline void |
| set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2) |
| { |
| if (b->flags & VNET_BUFFER_F_IS_IP4) |
| { |
| ip4_header_t *ip4; |
| generic_header_offset_t gho = { 0 }; |
| vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ , |
| 0 /* ip6 */ ); |
| hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| hdr->gso_size = vnet_buffer2 (b)->gso_size; |
| hdr->hdr_len = gho.hdr_sz; |
| hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| hdr->csum_start = gho.l4_hdr_offset; // 0x22; |
| hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); |
| ip4 = |
| (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset); |
| /* |
| * virtio devices do not support IP4 checksum offload. So driver takes care |
| * of it while doing tx. |
| */ |
| if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) |
| ip4->checksum = ip4_header_checksum (ip4); |
| } |
| else if (b->flags & VNET_BUFFER_F_IS_IP6) |
| { |
| generic_header_offset_t gho = { 0 }; |
| vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ , |
| 1 /* ip6 */ ); |
| hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| hdr->gso_size = vnet_buffer2 (b)->gso_size; |
| hdr->hdr_len = gho.hdr_sz; |
| hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| hdr->csum_start = gho.l4_hdr_offset; // 0x36; |
| hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); |
| } |
| } |
| |
| static_always_inline u16 |
| add_buffer_to_slot (vlib_main_t * vm, vlib_node_runtime_t * node, |
| virtio_if_t * vif, virtio_if_type_t type, |
| virtio_vring_t * vring, u32 bi, u16 free_desc_count, |
| u16 avail, u16 next, u16 mask, int do_gso, |
| int csum_offload) |
| { |
| u16 n_added = 0; |
| int hdr_sz = vif->virtio_net_hdr_sz; |
| vring_desc_t *d; |
| d = &vring->desc[next]; |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz; |
| int is_l2 = (type & (VIRTIO_IF_TYPE_TAP | VIRTIO_IF_TYPE_PCI)); |
| |
| clib_memset (hdr, 0, hdr_sz); |
| |
| if (b->flags & VNET_BUFFER_F_GSO) |
| { |
| if (do_gso) |
| set_gso_offsets (b, hdr, is_l2); |
| else |
| { |
| virtio_interface_drop_inline (vm, node->node_index, &bi, 1, |
| VIRTIO_TX_ERROR_GSO_PACKET_DROP); |
| return n_added; |
| } |
| } |
| else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | |
| VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) |
| { |
| if (csum_offload) |
| set_checksum_offsets (b, hdr, is_l2); |
| else |
| { |
| virtio_interface_drop_inline (vm, node->node_index, &bi, 1, |
| VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP); |
| return n_added; |
| } |
| } |
| |
| if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| virtio_tx_trace (vm, node, type, b, bi); |
| } |
| |
| if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0)) |
| { |
| d->addr = |
| ((type == VIRTIO_IF_TYPE_PCI) ? vlib_buffer_get_current_pa (vm, |
| b) : |
| pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz; |
| d->len = b->current_length + hdr_sz; |
| d->flags = 0; |
| } |
| else if (vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) |
| { |
| /* |
| * We are using single vlib_buffer_t for indirect descriptor(s) |
| * chain. Single descriptor is 16 bytes and vlib_buffer_t |
| * has 2048 bytes space. So maximum long chain can have 128 |
| * (=2048/16) indirect descriptors. |
| * It can easily support 65535 bytes of Jumbo frames with |
| * each data buffer size of 512 bytes minimum. |
| */ |
| u32 indirect_buffer = 0; |
| if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0)) |
| { |
| virtio_interface_drop_inline (vm, node->node_index, &bi, 1, |
| VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED); |
| return n_added; |
| } |
| |
| vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer); |
| indirect_desc->current_data = 0; |
| indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| indirect_desc->next_buffer = bi; |
| bi = indirect_buffer; |
| |
| vring_desc_t *id = |
| (vring_desc_t *) vlib_buffer_get_current (indirect_desc); |
| u32 count = 1; |
| if (type == VIRTIO_IF_TYPE_PCI) |
| { |
| d->addr = vlib_physmem_get_pa (vm, id); |
| id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz; |
| |
| /* |
| * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr |
| * should be presented in separate descriptor and data will start |
| * from next descriptor. |
| */ |
| if (PREDICT_TRUE |
| (vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT))) |
| id->len = b->current_length + hdr_sz; |
| else |
| { |
| id->len = hdr_sz; |
| id->flags = VRING_DESC_F_NEXT; |
| id->next = count; |
| count++; |
| id++; |
| id->addr = vlib_buffer_get_current_pa (vm, b); |
| id->len = b->current_length; |
| } |
| while (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| id->flags = VRING_DESC_F_NEXT; |
| id->next = count; |
| count++; |
| id++; |
| b = vlib_get_buffer (vm, b->next_buffer); |
| id->addr = vlib_buffer_get_current_pa (vm, b); |
| id->len = b->current_length; |
| } |
| } |
| else /* VIRTIO_IF_TYPE_[TAP | TUN] */ |
| { |
| d->addr = pointer_to_uword (id); |
| /* first buffer in chain */ |
| id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz; |
| id->len = b->current_length + hdr_sz; |
| |
| while (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| id->flags = VRING_DESC_F_NEXT; |
| id->next = count; |
| count++; |
| id++; |
| b = vlib_get_buffer (vm, b->next_buffer); |
| id->addr = pointer_to_uword (vlib_buffer_get_current (b)); |
| id->len = b->current_length; |
| } |
| } |
| id->flags = 0; |
| id->next = 0; |
| d->len = count * sizeof (vring_desc_t); |
| d->flags = VRING_DESC_F_INDIRECT; |
| } |
| else if (type == VIRTIO_IF_TYPE_PCI) |
| { |
| u16 count = next; |
| vlib_buffer_t *b_temp = b; |
| u16 n_buffers_in_chain = 1; |
| |
| /* |
| * Check the length of the chain for the required number of |
| * descriptors. Return from here, retry to get more descriptors, |
| * if chain length is greater than available descriptors. |
| */ |
| while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| n_buffers_in_chain++; |
| b_temp = vlib_get_buffer (vm, b_temp->next_buffer); |
| } |
| |
| if (n_buffers_in_chain > free_desc_count) |
| return n_buffers_in_chain; |
| |
| d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz; |
| d->len = b->current_length + hdr_sz; |
| |
| while (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| d->flags = VRING_DESC_F_NEXT; |
| vring->buffers[count] = bi; |
| b->flags &= |
| ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID); |
| bi = b->next_buffer; |
| b->next_buffer = 0; |
| n_added++; |
| count = (count + 1) & mask; |
| d->next = count; |
| d = &vring->desc[count]; |
| b = vlib_get_buffer (vm, bi); |
| d->addr = vlib_buffer_get_current_pa (vm, b); |
| d->len = b->current_length; |
| } |
| d->flags = 0; |
| vring->buffers[count] = bi; |
| vring->avail->ring[avail & mask] = next; |
| n_added++; |
| return n_added; |
| } |
| else |
| { |
| ASSERT (0); |
| } |
| vring->buffers[next] = bi; |
| vring->avail->ring[avail & mask] = next; |
| n_added++; |
| return n_added; |
| } |
| |
| static_always_inline void |
| virtio_find_free_desc (virtio_vring_t * vring, u16 size, u16 mask, |
| u16 req, u16 next, u32 * first_free_desc_index, |
| u16 * free_desc_count) |
| { |
| u16 start = 0; |
| /* next is used as hint: from where to start looking */ |
| for (u16 i = 0; i < size; i++, next++) |
| { |
| if (vring->buffers[next & mask] == ~0) |
| { |
| if (*first_free_desc_index == ~0) |
| { |
| *first_free_desc_index = (next & mask); |
| start = i; |
| (*free_desc_count)++; |
| req--; |
| if (req == 0) |
| break; |
| } |
| else |
| { |
| if (start + *free_desc_count == i) |
| { |
| (*free_desc_count)++; |
| req--; |
| if (req == 0) |
| break; |
| } |
| else |
| break; |
| } |
| } |
| } |
| } |
| |
| static_always_inline uword |
| virtio_interface_tx_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame, virtio_if_t * vif, |
| virtio_if_type_t type, int do_gso, |
| int csum_offload, int do_gro) |
| { |
| u16 n_left = frame->n_vectors; |
| virtio_vring_t *vring; |
| u16 qid = vm->thread_index % vif->num_txqs; |
| vring = vec_elt_at_index (vif->txq_vrings, qid); |
| u16 used, next, avail, n_buffers = 0, n_buffers_left = 0; |
| u16 sz = vring->size; |
| u16 mask = sz - 1; |
| u16 retry_count = 2; |
| u32 *buffers = vlib_frame_vector_args (frame); |
| u32 to[GRO_TO_VECTOR_SIZE (n_left)]; |
| |
| clib_spinlock_lock_if_init (&vring->lockp); |
| |
| if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0 && |
| (vring->last_kick_avail_idx != vring->avail->idx)) |
| virtio_kick (vm, vring, vif); |
| |
| if (do_gro) |
| { |
| n_left = vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to); |
| buffers = to; |
| } |
| |
| retry: |
| /* free consumed buffers */ |
| virtio_free_used_device_desc (vm, vring, node->node_index); |
| |
| used = vring->desc_in_use; |
| next = vring->desc_next; |
| avail = vring->avail->idx; |
| |
| u16 free_desc_count = 0; |
| |
| if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER)) |
| { |
| u32 first_free_desc_index = ~0; |
| |
| virtio_find_free_desc (vring, sz, mask, n_left, next, |
| &first_free_desc_index, &free_desc_count); |
| |
| if (free_desc_count) |
| next = first_free_desc_index; |
| } |
| else |
| free_desc_count = sz - used; |
| |
| if (vif->packet_buffering) |
| { |
| n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering); |
| |
| while (n_buffers_left && free_desc_count) |
| { |
| u16 n_added = 0; |
| |
| u32 bi = virtio_vring_buffering_read_from_front (vring->buffering); |
| if (bi == ~0) |
| break; |
| |
| n_added = |
| add_buffer_to_slot (vm, node, vif, type, vring, bi, |
| free_desc_count, avail, next, mask, do_gso, |
| csum_offload); |
| if (PREDICT_FALSE (n_added == 0)) |
| { |
| n_buffers_left--; |
| continue; |
| } |
| else if (PREDICT_FALSE (n_added > free_desc_count)) |
| break; |
| |
| avail++; |
| next = (next + n_added) & mask; |
| used += n_added; |
| n_buffers_left--; |
| free_desc_count -= n_added; |
| } |
| } |
| |
| while (n_left && free_desc_count) |
| { |
| u16 n_added = 0; |
| |
| n_added = |
| add_buffer_to_slot (vm, node, vif, type, vring, buffers[0], |
| free_desc_count, avail, next, mask, do_gso, |
| csum_offload); |
| |
| if (PREDICT_FALSE (n_added == 0)) |
| { |
| buffers++; |
| n_left--; |
| continue; |
| } |
| else if (PREDICT_FALSE (n_added > free_desc_count)) |
| break; |
| |
| avail++; |
| next = (next + n_added) & mask; |
| used += n_added; |
| buffers++; |
| n_left--; |
| free_desc_count -= n_added; |
| } |
| |
| if (n_left != frame->n_vectors || n_buffers != n_buffers_left) |
| { |
| CLIB_MEMORY_STORE_BARRIER (); |
| vring->avail->idx = avail; |
| vring->desc_next = next; |
| vring->desc_in_use = used; |
| if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0) |
| virtio_kick (vm, vring, vif); |
| } |
| |
| if (n_left) |
| { |
| if (retry_count--) |
| goto retry; |
| |
| if (vif->packet_buffering) |
| { |
| |
| u16 n_buffered = |
| virtio_vring_buffering_store_packets (vring->buffering, buffers, |
| n_left); |
| buffers += n_buffered; |
| n_left -= n_buffered; |
| } |
| if (n_left) |
| virtio_interface_drop_inline (vm, node->node_index, |
| buffers, n_left, |
| VIRTIO_TX_ERROR_NO_FREE_SLOTS); |
| } |
| |
| clib_spinlock_unlock_if_init (&vring->lockp); |
| |
| return frame->n_vectors - n_left; |
| } |
| |
| static_always_inline uword |
| virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame, virtio_if_t * vif, |
| virtio_if_type_t type) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index); |
| |
| if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) |
| return virtio_interface_tx_gso_inline (vm, node, frame, vif, type, |
| 1 /* do_gso */ , |
| 1 /* checksum offload */ , |
| vif->packet_coalesce); |
| else if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD) |
| return virtio_interface_tx_gso_inline (vm, node, frame, vif, type, |
| 0 /* no do_gso */ , |
| 1 /* checksum offload */ , |
| 0 /* do_gro */ ); |
| else |
| return virtio_interface_tx_gso_inline (vm, node, frame, vif, type, |
| 0 /* no do_gso */ , |
| 0 /* no checksum offload */ , |
| 0 /* do_gro */ ); |
| } |
| |
| VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| virtio_main_t *nm = &virtio_main; |
| vnet_interface_output_runtime_t *rund = (void *) node->runtime_data; |
| virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance); |
| |
| if (vif->type == VIRTIO_IF_TYPE_TAP) |
| return virtio_interface_tx_inline (vm, node, frame, vif, |
| VIRTIO_IF_TYPE_TAP); |
| else if (vif->type == VIRTIO_IF_TYPE_PCI) |
| return virtio_interface_tx_inline (vm, node, frame, vif, |
| VIRTIO_IF_TYPE_PCI); |
| else if (vif->type == VIRTIO_IF_TYPE_TUN) |
| return virtio_interface_tx_inline (vm, node, frame, vif, |
| VIRTIO_IF_TYPE_TUN); |
| else |
| ASSERT (0); |
| |
| return 0; |
| } |
| |
| static void |
| virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index, |
| u32 node_index) |
| { |
| virtio_main_t *apm = &virtio_main; |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); |
| virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance); |
| |
| /* Shut off redirection */ |
| if (node_index == ~0) |
| { |
| vif->per_interface_next_index = node_index; |
| return; |
| } |
| |
| vif->per_interface_next_index = |
| vlib_node_add_next (vlib_get_main (), virtio_input_node.index, |
| node_index); |
| } |
| |
| static void |
| virtio_clear_hw_interface_counters (u32 instance) |
| { |
| /* Nothing for now */ |
| } |
| |
| static clib_error_t * |
| virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid, |
| vnet_hw_if_rx_mode mode) |
| { |
| virtio_main_t *mm = &virtio_main; |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); |
| virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance); |
| virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid); |
| virtio_vring_t *tx_vring = 0; |
| |
| if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode)) |
| { |
| rx_vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT; |
| return clib_error_return (0, "interrupt mode is not supported"); |
| } |
| |
| if (mode == VNET_HW_IF_RX_MODE_POLLING) |
| { |
| vec_foreach (tx_vring, vif->txq_vrings) |
| { |
| /* only enable packet coalesce in poll mode */ |
| gro_flow_table_set_is_enable (tx_vring->flow_table, 1); |
| /* only enable packet buffering in poll mode */ |
| virtio_vring_buffering_set_is_enable (tx_vring->buffering, 1); |
| } |
| rx_vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT; |
| } |
| else |
| { |
| if (vif->packet_coalesce || vif->packet_buffering) |
| { |
| virtio_log_warning (vif, |
| "interface %U is in interrupt mode, disabling packet coalescing or buffering", |
| format_vnet_sw_if_index_name, vnet_get_main (), |
| vif->sw_if_index); |
| vec_foreach (tx_vring, vif->txq_vrings) |
| { |
| gro_flow_table_set_is_enable (tx_vring->flow_table, 0); |
| virtio_vring_buffering_set_is_enable (tx_vring->buffering, 0); |
| } |
| } |
| rx_vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT; |
| } |
| |
| return 0; |
| } |
| |
| static clib_error_t * |
| virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags) |
| { |
| virtio_main_t *mm = &virtio_main; |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); |
| virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance); |
| |
| if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) |
| { |
| vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP; |
| vnet_hw_interface_set_flags (vnm, vif->hw_if_index, |
| VNET_HW_INTERFACE_FLAG_LINK_UP); |
| } |
| else |
| { |
| vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP; |
| vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0); |
| } |
| return 0; |
| } |
| |
| static clib_error_t * |
| virtio_subif_add_del_function (vnet_main_t * vnm, |
| u32 hw_if_index, |
| struct vnet_sw_interface_t *st, int is_add) |
| { |
| /* Nothing for now */ |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VNET_DEVICE_CLASS (virtio_device_class) = { |
| .name = "virtio", |
| .format_device_name = format_virtio_device_name, |
| .format_device = format_virtio_device, |
| .format_tx_trace = format_virtio_tx_trace, |
| .tx_function_n_errors = VIRTIO_TX_N_ERROR, |
| .tx_function_error_strings = virtio_tx_func_error_strings, |
| .rx_redirect_to_node = virtio_set_interface_next_node, |
| .clear_counters = virtio_clear_hw_interface_counters, |
| .admin_up_down_function = virtio_interface_admin_up_down, |
| .subif_add_del_function = virtio_subif_add_del_function, |
| .rx_mode_change_function = virtio_interface_rx_mode_change, |
| }; |
| |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |