Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1 | /* |
| 2 | *------------------------------------------------------------------ |
| 3 | * vhost-user-output |
| 4 | * |
| 5 | * Copyright (c) 2014-2018 Cisco and/or its affiliates. |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at: |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | *------------------------------------------------------------------ |
| 18 | */ |
| 19 | |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 20 | #include <stddef.h> |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 21 | #include <fcntl.h> /* for open */ |
| 22 | #include <sys/ioctl.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <sys/un.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/uio.h> /* for iovec */ |
| 28 | #include <netinet/in.h> |
| 29 | #include <sys/vfs.h> |
| 30 | |
| 31 | #include <linux/if_arp.h> |
| 32 | #include <linux/if_tun.h> |
| 33 | |
| 34 | #include <vlib/vlib.h> |
| 35 | #include <vlib/unix/unix.h> |
| 36 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 37 | #include <vnet/ethernet/ethernet.h> |
| 38 | #include <vnet/devices/devices.h> |
| 39 | #include <vnet/feature/feature.h> |
Mohsin Kazmi | f546236 | 2021-02-23 15:55:04 +0100 | [diff] [blame] | 40 | #include <vnet/ip/ip_psh_cksum.h> |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 41 | |
| 42 | #include <vnet/devices/virtio/vhost_user.h> |
| 43 | #include <vnet/devices/virtio/vhost_user_inline.h> |
| 44 | |
Mohsin Kazmi | 0b04209 | 2020-04-17 16:50:56 +0000 | [diff] [blame] | 45 | #include <vnet/gso/hdr_offset_parser.h> |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 46 | /* |
| 47 | * On the transmit side, we keep processing the buffers from vlib in the while |
| 48 | * loop and prepare the copy order to be executed later. However, the static |
| 49 | * array which we keep the copy order is limited to VHOST_USER_COPY_ARRAY_N |
| 50 | * entries. In order to not corrupt memory, we have to do the copy when the |
| 51 | * static array reaches the copy threshold. We subtract 40 in case the code |
| 52 | * goes into the inner loop for a maximum of 64k frames which may require |
Steven Luong | 7331005 | 2019-10-23 13:28:37 -0700 | [diff] [blame] | 53 | * more array entries. We subtract 200 because our default buffer size is |
| 54 | * 2048 and the default desc len is likely 1536. While it takes less than 40 |
| 55 | * vlib buffers for the jumbo frame, it may take twice as much descriptors |
| 56 | * for the same jumbo frame. Use 200 for the extra head room. |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 57 | */ |
Steven Luong | 7331005 | 2019-10-23 13:28:37 -0700 | [diff] [blame] | 58 | #define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 200) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 59 | |
BenoƮt Ganne | 47727c0 | 2019-02-12 13:35:08 +0100 | [diff] [blame] | 60 | extern vnet_device_class_t vhost_user_device_class; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 61 | |
| 62 | #define foreach_vhost_user_tx_func_error \ |
| 63 | _(NONE, "no error") \ |
| 64 | _(NOT_READY, "vhost vring not ready") \ |
| 65 | _(DOWN, "vhost interface is down") \ |
| 66 | _(PKT_DROP_NOBUF, "tx packet drops (no available descriptors)") \ |
| 67 | _(PKT_DROP_NOMRG, "tx packet drops (cannot merge descriptors)") \ |
| 68 | _(MMAP_FAIL, "mmap failure") \ |
| 69 | _(INDIRECT_OVERFLOW, "indirect descriptor table overflow") |
| 70 | |
| 71 | typedef enum |
| 72 | { |
| 73 | #define _(f,s) VHOST_USER_TX_FUNC_ERROR_##f, |
| 74 | foreach_vhost_user_tx_func_error |
| 75 | #undef _ |
| 76 | VHOST_USER_TX_FUNC_N_ERROR, |
| 77 | } vhost_user_tx_func_error_t; |
| 78 | |
| 79 | static __clib_unused char *vhost_user_tx_func_error_strings[] = { |
| 80 | #define _(n,s) s, |
| 81 | foreach_vhost_user_tx_func_error |
| 82 | #undef _ |
| 83 | }; |
| 84 | |
| 85 | static __clib_unused u8 * |
| 86 | format_vhost_user_interface_name (u8 * s, va_list * args) |
| 87 | { |
| 88 | u32 i = va_arg (*args, u32); |
| 89 | u32 show_dev_instance = ~0; |
| 90 | vhost_user_main_t *vum = &vhost_user_main; |
| 91 | |
| 92 | if (i < vec_len (vum->show_dev_instance_by_real_dev_instance)) |
| 93 | show_dev_instance = vum->show_dev_instance_by_real_dev_instance[i]; |
| 94 | |
| 95 | if (show_dev_instance != ~0) |
| 96 | i = show_dev_instance; |
| 97 | |
| 98 | s = format (s, "VirtualEthernet0/0/%d", i); |
| 99 | return s; |
| 100 | } |
| 101 | |
| 102 | static __clib_unused int |
| 103 | vhost_user_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance) |
| 104 | { |
| 105 | // FIXME: check if the new dev instance is already used |
| 106 | vhost_user_main_t *vum = &vhost_user_main; |
Jerome Tollet | 2f54c27 | 2018-10-02 11:41:11 +0200 | [diff] [blame] | 107 | vhost_user_intf_t *vui = pool_elt_at_index (vum->vhost_user_interfaces, |
| 108 | hi->dev_instance); |
| 109 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 110 | vec_validate_init_empty (vum->show_dev_instance_by_real_dev_instance, |
| 111 | hi->dev_instance, ~0); |
| 112 | |
| 113 | vum->show_dev_instance_by_real_dev_instance[hi->dev_instance] = |
| 114 | new_dev_instance; |
| 115 | |
Jerome Tollet | 2f54c27 | 2018-10-02 11:41:11 +0200 | [diff] [blame] | 116 | vu_log_debug (vui, "renumbered vhost-user interface dev_instance %d to %d", |
| 117 | hi->dev_instance, new_dev_instance); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 122 | static_always_inline void |
| 123 | vhost_user_tx_trace (vhost_trace_t * t, |
| 124 | vhost_user_intf_t * vui, u16 qid, |
| 125 | vlib_buffer_t * b, vhost_user_vring_t * rxvq) |
| 126 | { |
| 127 | vhost_user_main_t *vum = &vhost_user_main; |
| 128 | u32 last_avail_idx = rxvq->last_avail_idx; |
| 129 | u32 desc_current = rxvq->avail->ring[last_avail_idx & rxvq->qsz_mask]; |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 130 | vnet_virtio_vring_desc_t *hdr_desc = 0; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 131 | u32 hint = 0; |
| 132 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 133 | clib_memset (t, 0, sizeof (*t)); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 134 | t->device_index = vui - vum->vhost_user_interfaces; |
| 135 | t->qid = qid; |
| 136 | |
| 137 | hdr_desc = &rxvq->desc[desc_current]; |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 138 | if (rxvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 139 | { |
| 140 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; |
| 141 | /* Header is the first here */ |
| 142 | hdr_desc = map_guest_mem (vui, rxvq->desc[desc_current].addr, &hint); |
| 143 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 144 | if (rxvq->desc[desc_current].flags & VRING_DESC_F_NEXT) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 145 | { |
| 146 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; |
| 147 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 148 | if (!(rxvq->desc[desc_current].flags & VRING_DESC_F_NEXT) && |
| 149 | !(rxvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 150 | { |
| 151 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; |
| 152 | } |
| 153 | |
| 154 | t->first_desc_len = hdr_desc ? hdr_desc->len : 0; |
| 155 | } |
| 156 | |
| 157 | static_always_inline u32 |
| 158 | vhost_user_tx_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, |
| 159 | u16 copy_len, u32 * map_hint) |
| 160 | { |
| 161 | void *dst0, *dst1, *dst2, *dst3; |
| 162 | if (PREDICT_TRUE (copy_len >= 4)) |
| 163 | { |
| 164 | if (PREDICT_FALSE (!(dst2 = map_guest_mem (vui, cpy[0].dst, map_hint)))) |
| 165 | return 1; |
| 166 | if (PREDICT_FALSE (!(dst3 = map_guest_mem (vui, cpy[1].dst, map_hint)))) |
| 167 | return 1; |
| 168 | while (PREDICT_TRUE (copy_len >= 4)) |
| 169 | { |
| 170 | dst0 = dst2; |
| 171 | dst1 = dst3; |
| 172 | |
| 173 | if (PREDICT_FALSE |
| 174 | (!(dst2 = map_guest_mem (vui, cpy[2].dst, map_hint)))) |
| 175 | return 1; |
| 176 | if (PREDICT_FALSE |
| 177 | (!(dst3 = map_guest_mem (vui, cpy[3].dst, map_hint)))) |
| 178 | return 1; |
| 179 | |
Damjan Marion | af7fb04 | 2021-07-15 11:54:41 +0200 | [diff] [blame] | 180 | clib_prefetch_load ((void *) cpy[2].src); |
| 181 | clib_prefetch_load ((void *) cpy[3].src); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 182 | |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 183 | clib_memcpy_fast (dst0, (void *) cpy[0].src, cpy[0].len); |
| 184 | clib_memcpy_fast (dst1, (void *) cpy[1].src, cpy[1].len); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 185 | |
| 186 | vhost_user_log_dirty_pages_2 (vui, cpy[0].dst, cpy[0].len, 1); |
| 187 | vhost_user_log_dirty_pages_2 (vui, cpy[1].dst, cpy[1].len, 1); |
| 188 | copy_len -= 2; |
| 189 | cpy += 2; |
| 190 | } |
| 191 | } |
| 192 | while (copy_len) |
| 193 | { |
| 194 | if (PREDICT_FALSE (!(dst0 = map_guest_mem (vui, cpy->dst, map_hint)))) |
| 195 | return 1; |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 196 | clib_memcpy_fast (dst0, (void *) cpy->src, cpy->len); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 197 | vhost_user_log_dirty_pages_2 (vui, cpy->dst, cpy->len, 1); |
| 198 | copy_len -= 1; |
| 199 | cpy += 1; |
| 200 | } |
| 201 | return 0; |
| 202 | } |
| 203 | |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 204 | static_always_inline void |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 205 | vhost_user_handle_tx_offload (vhost_user_intf_t *vui, vlib_buffer_t *b, |
| 206 | vnet_virtio_net_hdr_t *hdr) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 207 | { |
Mohsin Kazmi | 0b04209 | 2020-04-17 16:50:56 +0000 | [diff] [blame] | 208 | generic_header_offset_t gho = { 0 }; |
Mohsin Kazmi | 84f91fa | 2020-04-23 17:59:49 +0200 | [diff] [blame] | 209 | int is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4; |
| 210 | int is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6; |
Mohsin Kazmi | 36f7a6a | 2021-05-05 14:26:38 +0200 | [diff] [blame] | 211 | vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags; |
Mohsin Kazmi | f546236 | 2021-02-23 15:55:04 +0100 | [diff] [blame] | 212 | u16 psh_cksum = 0; |
| 213 | ip4_header_t *ip4 = 0; |
| 214 | ip6_header_t *ip6 = 0; |
Mohsin Kazmi | 84f91fa | 2020-04-23 17:59:49 +0200 | [diff] [blame] | 215 | |
| 216 | ASSERT (!(is_ip4 && is_ip6)); |
| 217 | vnet_generic_header_offset_parser (b, &gho, 1 /* l2 */ , is_ip4, is_ip6); |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 218 | if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM) |
Mohsin Kazmi | affc5f6 | 2019-12-26 20:42:18 +0100 | [diff] [blame] | 219 | { |
Mohsin Kazmi | affc5f6 | 2019-12-26 20:42:18 +0100 | [diff] [blame] | 220 | ip4 = |
| 221 | (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset); |
| 222 | ip4->checksum = ip4_header_checksum (ip4); |
Mohsin Kazmi | f546236 | 2021-02-23 15:55:04 +0100 | [diff] [blame] | 223 | psh_cksum = ip4_pseudo_header_cksum (ip4); |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | ip6 = (ip6_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset); |
| 228 | psh_cksum = ip6_pseudo_header_cksum (ip6); |
Mohsin Kazmi | affc5f6 | 2019-12-26 20:42:18 +0100 | [diff] [blame] | 229 | } |
| 230 | |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 231 | /* checksum offload */ |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 232 | if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 233 | { |
Mohsin Kazmi | f546236 | 2021-02-23 15:55:04 +0100 | [diff] [blame] | 234 | udp_header_t *udp = |
| 235 | (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset); |
| 236 | udp->checksum = psh_cksum; |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 237 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Mohsin Kazmi | affc5f6 | 2019-12-26 20:42:18 +0100 | [diff] [blame] | 238 | hdr->csum_start = gho.l4_hdr_offset; |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 239 | hdr->csum_offset = offsetof (udp_header_t, checksum); |
| 240 | } |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 241 | else if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 242 | { |
Mohsin Kazmi | f546236 | 2021-02-23 15:55:04 +0100 | [diff] [blame] | 243 | tcp_header_t *tcp = |
| 244 | (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset); |
| 245 | tcp->checksum = psh_cksum; |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 246 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Mohsin Kazmi | affc5f6 | 2019-12-26 20:42:18 +0100 | [diff] [blame] | 247 | hdr->csum_start = gho.l4_hdr_offset; |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 248 | hdr->csum_offset = offsetof (tcp_header_t, checksum); |
| 249 | } |
| 250 | |
| 251 | /* GSO offload */ |
| 252 | if (b->flags & VNET_BUFFER_F_GSO) |
| 253 | { |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 254 | if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 255 | { |
Mohsin Kazmi | 84f91fa | 2020-04-23 17:59:49 +0200 | [diff] [blame] | 256 | if (is_ip4 && |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 257 | (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO4))) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 258 | { |
| 259 | hdr->gso_size = vnet_buffer2 (b)->gso_size; |
| 260 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 261 | } |
Mohsin Kazmi | 84f91fa | 2020-04-23 17:59:49 +0200 | [diff] [blame] | 262 | else if (is_ip6 && |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 263 | (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_TSO6))) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 264 | { |
| 265 | hdr->gso_size = vnet_buffer2 (b)->gso_size; |
| 266 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 267 | } |
| 268 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 269 | else if ((vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_UFO)) && |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 270 | (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 271 | { |
| 272 | hdr->gso_size = vnet_buffer2 (b)->gso_size; |
| 273 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 278 | static_always_inline void |
Steven Luong | 27ba500 | 2020-11-17 13:30:44 -0800 | [diff] [blame] | 279 | vhost_user_mark_desc_available (vlib_main_t * vm, vhost_user_intf_t * vui, |
| 280 | vhost_user_vring_t * rxvq, |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 281 | u16 * n_descs_processed, u8 chained, |
| 282 | vlib_frame_t * frame, u32 n_left) |
| 283 | { |
| 284 | u16 desc_idx, flags; |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 285 | vnet_virtio_vring_packed_desc_t *desc_table = rxvq->packed_desc; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 286 | u16 last_used_idx = rxvq->last_used_idx; |
| 287 | |
| 288 | if (PREDICT_FALSE (*n_descs_processed == 0)) |
| 289 | return; |
| 290 | |
| 291 | if (rxvq->used_wrap_counter) |
| 292 | flags = desc_table[last_used_idx & rxvq->qsz_mask].flags | |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 293 | (VRING_DESC_F_AVAIL | VRING_DESC_F_USED); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 294 | else |
| 295 | flags = desc_table[last_used_idx & rxvq->qsz_mask].flags & |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 296 | ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 297 | |
| 298 | vhost_user_advance_last_used_idx (rxvq); |
| 299 | |
| 300 | for (desc_idx = 1; desc_idx < *n_descs_processed; desc_idx++) |
| 301 | { |
| 302 | if (rxvq->used_wrap_counter) |
| 303 | desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags |= |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 304 | (VRING_DESC_F_AVAIL | VRING_DESC_F_USED); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 305 | else |
| 306 | desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags &= |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 307 | ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 308 | vhost_user_advance_last_used_idx (rxvq); |
| 309 | } |
| 310 | |
| 311 | desc_table[last_used_idx & rxvq->qsz_mask].flags = flags; |
| 312 | |
| 313 | *n_descs_processed = 0; |
| 314 | |
| 315 | if (chained) |
| 316 | { |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 317 | vnet_virtio_vring_packed_desc_t *desc_table = rxvq->packed_desc; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 318 | |
| 319 | while (desc_table[rxvq->last_used_idx & rxvq->qsz_mask].flags & |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 320 | VRING_DESC_F_NEXT) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 321 | vhost_user_advance_last_used_idx (rxvq); |
| 322 | |
| 323 | /* Advance past the current chained table entries */ |
| 324 | vhost_user_advance_last_used_idx (rxvq); |
| 325 | } |
| 326 | |
| 327 | /* interrupt (call) handling */ |
| 328 | if ((rxvq->callfd_idx != ~0) && |
| 329 | (rxvq->avail_event->flags != VRING_EVENT_F_DISABLE)) |
| 330 | { |
| 331 | vhost_user_main_t *vum = &vhost_user_main; |
| 332 | |
| 333 | rxvq->n_since_last_int += frame->n_vectors - n_left; |
| 334 | if (rxvq->n_since_last_int > vum->coalesce_frames) |
Steven Luong | 27ba500 | 2020-11-17 13:30:44 -0800 | [diff] [blame] | 335 | vhost_user_send_call (vm, vui, rxvq); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 336 | } |
| 337 | } |
| 338 | |
| 339 | static_always_inline void |
| 340 | vhost_user_tx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui, |
| 341 | u16 qid, vlib_buffer_t * b, |
| 342 | vhost_user_vring_t * rxvq) |
| 343 | { |
| 344 | vhost_user_main_t *vum = &vhost_user_main; |
| 345 | u32 last_avail_idx = rxvq->last_avail_idx; |
| 346 | u32 desc_current = last_avail_idx & rxvq->qsz_mask; |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 347 | vnet_virtio_vring_packed_desc_t *hdr_desc = 0; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 348 | u32 hint = 0; |
| 349 | |
| 350 | clib_memset (t, 0, sizeof (*t)); |
| 351 | t->device_index = vui - vum->vhost_user_interfaces; |
| 352 | t->qid = qid; |
| 353 | |
| 354 | hdr_desc = &rxvq->packed_desc[desc_current]; |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 355 | if (rxvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 356 | { |
| 357 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; |
| 358 | /* Header is the first here */ |
| 359 | hdr_desc = map_guest_mem (vui, rxvq->packed_desc[desc_current].addr, |
| 360 | &hint); |
| 361 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 362 | if (rxvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 363 | { |
| 364 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; |
| 365 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 366 | if (!(rxvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) && |
| 367 | !(rxvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT)) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 368 | { |
| 369 | t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; |
| 370 | } |
| 371 | |
| 372 | t->first_desc_len = hdr_desc ? hdr_desc->len : 0; |
| 373 | } |
| 374 | |
| 375 | static_always_inline uword |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 376 | vhost_user_device_class_packed (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 377 | vlib_frame_t *frame, vhost_user_intf_t *vui, |
| 378 | vhost_user_vring_t *rxvq) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 379 | { |
| 380 | u32 *buffers = vlib_frame_vector_args (frame); |
| 381 | u32 n_left = frame->n_vectors; |
| 382 | vhost_user_main_t *vum = &vhost_user_main; |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 383 | u32 qid = rxvq->qid; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 384 | u8 error; |
| 385 | u32 thread_index = vm->thread_index; |
| 386 | vhost_cpu_t *cpu = &vum->cpus[thread_index]; |
| 387 | u32 map_hint = 0; |
| 388 | u8 retry = 8; |
| 389 | u16 copy_len; |
| 390 | u16 tx_headers_len; |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 391 | vnet_virtio_vring_packed_desc_t *desc_table; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 392 | u32 or_flags; |
| 393 | u16 desc_head, desc_index, desc_len; |
| 394 | u16 n_descs_processed; |
| 395 | u8 indirect, chained; |
| 396 | |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 397 | retry: |
| 398 | error = VHOST_USER_TX_FUNC_ERROR_NONE; |
| 399 | tx_headers_len = 0; |
| 400 | copy_len = 0; |
| 401 | n_descs_processed = 0; |
| 402 | |
| 403 | while (n_left > 0) |
| 404 | { |
| 405 | vlib_buffer_t *b0, *current_b0; |
| 406 | uword buffer_map_addr; |
| 407 | u32 buffer_len; |
| 408 | u16 bytes_left; |
| 409 | u32 total_desc_len = 0; |
| 410 | u16 n_entries = 0; |
| 411 | |
| 412 | indirect = 0; |
| 413 | chained = 0; |
| 414 | if (PREDICT_TRUE (n_left > 1)) |
| 415 | vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD); |
| 416 | |
| 417 | b0 = vlib_get_buffer (vm, buffers[0]); |
| 418 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 419 | { |
| 420 | cpu->current_trace = vlib_add_trace (vm, node, b0, |
| 421 | sizeof (*cpu->current_trace)); |
| 422 | vhost_user_tx_trace_packed (cpu->current_trace, vui, qid / 2, b0, |
| 423 | rxvq); |
| 424 | } |
| 425 | |
| 426 | desc_table = rxvq->packed_desc; |
| 427 | desc_head = desc_index = rxvq->last_avail_idx & rxvq->qsz_mask; |
| 428 | if (PREDICT_FALSE (!vhost_user_packed_desc_available (rxvq, desc_head))) |
| 429 | { |
| 430 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; |
| 431 | goto done; |
| 432 | } |
| 433 | /* |
| 434 | * Go deeper in case of indirect descriptor. |
| 435 | * To test it, turn off mrg_rxbuf. |
| 436 | */ |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 437 | if (desc_table[desc_head].flags & VRING_DESC_F_INDIRECT) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 438 | { |
| 439 | indirect = 1; |
| 440 | if (PREDICT_FALSE (desc_table[desc_head].len < |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 441 | sizeof (vnet_virtio_vring_packed_desc_t))) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 442 | { |
| 443 | error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; |
| 444 | goto done; |
| 445 | } |
| 446 | n_entries = desc_table[desc_head].len >> 4; |
| 447 | desc_table = map_guest_mem (vui, desc_table[desc_index].addr, |
| 448 | &map_hint); |
| 449 | if (PREDICT_FALSE (desc_table == 0)) |
| 450 | { |
| 451 | error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; |
| 452 | goto done; |
| 453 | } |
| 454 | desc_index = 0; |
| 455 | } |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 456 | else if (rxvq->packed_desc[desc_head].flags & VRING_DESC_F_NEXT) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 457 | chained = 1; |
| 458 | |
| 459 | desc_len = vui->virtio_net_hdr_sz; |
| 460 | buffer_map_addr = desc_table[desc_index].addr; |
| 461 | buffer_len = desc_table[desc_index].len; |
| 462 | |
| 463 | /* Get a header from the header array */ |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 464 | vnet_virtio_net_hdr_mrg_rxbuf_t *hdr = &cpu->tx_headers[tx_headers_len]; |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 465 | tx_headers_len++; |
| 466 | hdr->hdr.flags = 0; |
| 467 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 468 | hdr->num_buffers = 1; |
| 469 | |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 470 | or_flags = (b0->flags & VNET_BUFFER_F_OFFLOAD); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 471 | |
| 472 | /* Guest supports csum offload and buffer requires checksum offload? */ |
| 473 | if (or_flags && |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 474 | (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM))) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 475 | vhost_user_handle_tx_offload (vui, b0, &hdr->hdr); |
| 476 | |
| 477 | /* Prepare a copy order executed later for the header */ |
| 478 | ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); |
| 479 | vhost_copy_t *cpy = &cpu->copy[copy_len]; |
| 480 | copy_len++; |
| 481 | cpy->len = vui->virtio_net_hdr_sz; |
| 482 | cpy->dst = buffer_map_addr; |
| 483 | cpy->src = (uword) hdr; |
| 484 | |
| 485 | buffer_map_addr += vui->virtio_net_hdr_sz; |
| 486 | buffer_len -= vui->virtio_net_hdr_sz; |
| 487 | bytes_left = b0->current_length; |
| 488 | current_b0 = b0; |
| 489 | while (1) |
| 490 | { |
| 491 | if (buffer_len == 0) |
| 492 | { |
| 493 | /* Get new output */ |
| 494 | if (chained) |
| 495 | { |
| 496 | /* |
| 497 | * Next one is chained |
| 498 | * Test it with both indirect and mrg_rxbuf off |
| 499 | */ |
| 500 | if (PREDICT_FALSE (!(desc_table[desc_index].flags & |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 501 | VRING_DESC_F_NEXT))) |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 502 | { |
| 503 | /* |
| 504 | * Last descriptor in chain. |
| 505 | * Dequeue queued descriptors for this packet |
| 506 | */ |
| 507 | vhost_user_dequeue_chained_descs (rxvq, |
| 508 | &n_descs_processed); |
| 509 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; |
| 510 | goto done; |
| 511 | } |
| 512 | vhost_user_advance_last_avail_idx (rxvq); |
| 513 | desc_index = rxvq->last_avail_idx & rxvq->qsz_mask; |
| 514 | n_descs_processed++; |
| 515 | buffer_map_addr = desc_table[desc_index].addr; |
| 516 | buffer_len = desc_table[desc_index].len; |
| 517 | total_desc_len += desc_len; |
| 518 | desc_len = 0; |
| 519 | } |
| 520 | else if (indirect) |
| 521 | { |
| 522 | /* |
| 523 | * Indirect table |
| 524 | * Test it with mrg_rxnuf off |
| 525 | */ |
| 526 | if (PREDICT_TRUE (n_entries > 0)) |
| 527 | n_entries--; |
| 528 | else |
| 529 | { |
| 530 | /* Dequeue queued descriptors for this packet */ |
| 531 | vhost_user_dequeue_chained_descs (rxvq, |
| 532 | &n_descs_processed); |
| 533 | error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; |
| 534 | goto done; |
| 535 | } |
| 536 | total_desc_len += desc_len; |
| 537 | desc_index = (desc_index + 1) & rxvq->qsz_mask; |
| 538 | buffer_map_addr = desc_table[desc_index].addr; |
| 539 | buffer_len = desc_table[desc_index].len; |
| 540 | desc_len = 0; |
| 541 | } |
| 542 | else if (vui->virtio_net_hdr_sz == 12) |
| 543 | { |
| 544 | /* |
| 545 | * MRG is available |
| 546 | * This is the default setting for the guest VM |
| 547 | */ |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 548 | vnet_virtio_net_hdr_mrg_rxbuf_t *hdr = |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 549 | &cpu->tx_headers[tx_headers_len - 1]; |
| 550 | |
| 551 | desc_table[desc_index].len = desc_len; |
| 552 | vhost_user_advance_last_avail_idx (rxvq); |
| 553 | desc_head = desc_index = |
| 554 | rxvq->last_avail_idx & rxvq->qsz_mask; |
| 555 | hdr->num_buffers++; |
| 556 | n_descs_processed++; |
| 557 | desc_len = 0; |
| 558 | |
| 559 | if (PREDICT_FALSE (!vhost_user_packed_desc_available |
| 560 | (rxvq, desc_index))) |
| 561 | { |
| 562 | /* Dequeue queued descriptors for this packet */ |
| 563 | vhost_user_dequeue_descs (rxvq, hdr, |
| 564 | &n_descs_processed); |
| 565 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; |
| 566 | goto done; |
| 567 | } |
| 568 | |
| 569 | buffer_map_addr = desc_table[desc_index].addr; |
| 570 | buffer_len = desc_table[desc_index].len; |
| 571 | } |
| 572 | else |
| 573 | { |
| 574 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; |
| 575 | goto done; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); |
| 580 | vhost_copy_t *cpy = &cpu->copy[copy_len]; |
| 581 | copy_len++; |
| 582 | cpy->len = bytes_left; |
| 583 | cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len; |
| 584 | cpy->dst = buffer_map_addr; |
| 585 | cpy->src = (uword) vlib_buffer_get_current (current_b0) + |
| 586 | current_b0->current_length - bytes_left; |
| 587 | |
| 588 | bytes_left -= cpy->len; |
| 589 | buffer_len -= cpy->len; |
| 590 | buffer_map_addr += cpy->len; |
| 591 | desc_len += cpy->len; |
| 592 | |
Damjan Marion | af7fb04 | 2021-07-15 11:54:41 +0200 | [diff] [blame] | 593 | clib_prefetch_load (&rxvq->packed_desc); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 594 | |
| 595 | /* Check if vlib buffer has more data. If not, get more or break */ |
| 596 | if (PREDICT_TRUE (!bytes_left)) |
| 597 | { |
| 598 | if (PREDICT_FALSE |
| 599 | (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 600 | { |
| 601 | current_b0 = vlib_get_buffer (vm, current_b0->next_buffer); |
| 602 | bytes_left = current_b0->current_length; |
| 603 | } |
| 604 | else |
| 605 | { |
| 606 | /* End of packet */ |
| 607 | break; |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | /* Move from available to used ring */ |
| 613 | total_desc_len += desc_len; |
| 614 | rxvq->packed_desc[desc_head].len = total_desc_len; |
| 615 | |
| 616 | vhost_user_advance_last_avail_table_idx (vui, rxvq, chained); |
| 617 | n_descs_processed++; |
| 618 | |
| 619 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 620 | cpu->current_trace->hdr = cpu->tx_headers[tx_headers_len - 1]; |
| 621 | |
| 622 | n_left--; |
| 623 | |
| 624 | /* |
| 625 | * Do the copy periodically to prevent |
| 626 | * cpu->copy array overflow and corrupt memory |
| 627 | */ |
| 628 | if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD) || chained) |
| 629 | { |
| 630 | if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len, |
| 631 | &map_hint))) |
| 632 | vlib_error_count (vm, node->node_index, |
| 633 | VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); |
| 634 | copy_len = 0; |
| 635 | |
| 636 | /* give buffers back to driver */ |
Steven Luong | 27ba500 | 2020-11-17 13:30:44 -0800 | [diff] [blame] | 637 | vhost_user_mark_desc_available (vm, vui, rxvq, &n_descs_processed, |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 638 | chained, frame, n_left); |
| 639 | } |
| 640 | |
| 641 | buffers++; |
| 642 | } |
| 643 | |
| 644 | done: |
| 645 | if (PREDICT_TRUE (copy_len)) |
| 646 | { |
| 647 | if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len, |
| 648 | &map_hint))) |
| 649 | vlib_error_count (vm, node->node_index, |
| 650 | VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); |
| 651 | |
Steven Luong | 27ba500 | 2020-11-17 13:30:44 -0800 | [diff] [blame] | 652 | vhost_user_mark_desc_available (vm, vui, rxvq, &n_descs_processed, |
| 653 | chained, frame, n_left); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /* |
| 657 | * When n_left is set, error is always set to something too. |
| 658 | * In case error is due to lack of remaining buffers, we go back up and |
| 659 | * retry. |
| 660 | * The idea is that it is better to waste some time on packets |
| 661 | * that have been processed already than dropping them and get |
| 662 | * more fresh packets with a good likelyhood that they will be dropped too. |
| 663 | * This technique also gives more time to VM driver to pick-up packets. |
| 664 | * In case the traffic flows from physical to virtual interfaces, this |
| 665 | * technique will end-up leveraging the physical NIC buffer in order to |
| 666 | * absorb the VM's CPU jitter. |
| 667 | */ |
| 668 | if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry) |
| 669 | { |
| 670 | retry--; |
| 671 | goto retry; |
| 672 | } |
| 673 | |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 674 | clib_spinlock_unlock (&rxvq->vring_lock); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 675 | |
| 676 | if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE)) |
| 677 | { |
| 678 | vlib_error_count (vm, node->node_index, error, n_left); |
| 679 | vlib_increment_simple_counter |
| 680 | (vnet_main.interface_main.sw_if_counters + |
| 681 | VNET_INTERFACE_COUNTER_DROP, thread_index, vui->sw_if_index, n_left); |
| 682 | } |
| 683 | |
| 684 | vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors); |
| 685 | return frame->n_vectors; |
| 686 | } |
| 687 | |
Mohsin Kazmi | dd8e7d0 | 2018-07-23 14:45:57 +0200 | [diff] [blame] | 688 | VNET_DEVICE_CLASS_TX_FN (vhost_user_device_class) (vlib_main_t * vm, |
| 689 | vlib_node_runtime_t * |
| 690 | node, vlib_frame_t * frame) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 691 | { |
Damjan Marion | a3d5986 | 2018-11-10 10:23:00 +0100 | [diff] [blame] | 692 | u32 *buffers = vlib_frame_vector_args (frame); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 693 | u32 n_left = frame->n_vectors; |
| 694 | vhost_user_main_t *vum = &vhost_user_main; |
| 695 | vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; |
| 696 | vhost_user_intf_t *vui = |
| 697 | pool_elt_at_index (vum->vhost_user_interfaces, rd->dev_instance); |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 698 | u32 qid; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 699 | vhost_user_vring_t *rxvq; |
| 700 | u8 error; |
Damjan Marion | 067cd62 | 2018-07-11 12:47:43 +0200 | [diff] [blame] | 701 | u32 thread_index = vm->thread_index; |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 702 | vhost_cpu_t *cpu = &vum->cpus[thread_index]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 703 | u32 map_hint = 0; |
| 704 | u8 retry = 8; |
| 705 | u16 copy_len; |
| 706 | u16 tx_headers_len; |
Steven Luong | 564e167 | 2020-01-30 15:18:45 -0800 | [diff] [blame] | 707 | u32 or_flags; |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 708 | vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 709 | |
| 710 | if (PREDICT_FALSE (!vui->admin_up)) |
| 711 | { |
| 712 | error = VHOST_USER_TX_FUNC_ERROR_DOWN; |
| 713 | goto done3; |
| 714 | } |
| 715 | |
Juraj Sloboda | b192feb | 2018-10-01 12:42:07 +0200 | [diff] [blame] | 716 | if (PREDICT_FALSE (!vui->is_ready)) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 717 | { |
| 718 | error = VHOST_USER_TX_FUNC_ERROR_NOT_READY; |
| 719 | goto done3; |
| 720 | } |
| 721 | |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 722 | qid = VHOST_VRING_IDX_RX (tf->queue_id); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 723 | rxvq = &vui->vrings[qid]; |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 724 | ASSERT (tf->queue_id == rxvq->qid); |
| 725 | |
Steven | 0c46998 | 2018-11-04 08:20:01 -0800 | [diff] [blame] | 726 | if (PREDICT_FALSE (rxvq->avail == 0)) |
| 727 | { |
| 728 | error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; |
| 729 | goto done3; |
| 730 | } |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 731 | if (tf->shared_queue) |
| 732 | clib_spinlock_lock (&rxvq->vring_lock); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 733 | |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 734 | if (vhost_user_is_packed_ring_supported (vui)) |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 735 | return (vhost_user_device_class_packed (vm, node, frame, vui, rxvq)); |
Steven Luong | bc0d9ff | 2020-03-23 09:34:59 -0700 | [diff] [blame] | 736 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 737 | retry: |
| 738 | error = VHOST_USER_TX_FUNC_ERROR_NONE; |
| 739 | tx_headers_len = 0; |
| 740 | copy_len = 0; |
| 741 | while (n_left > 0) |
| 742 | { |
| 743 | vlib_buffer_t *b0, *current_b0; |
| 744 | u16 desc_head, desc_index, desc_len; |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 745 | vnet_virtio_vring_desc_t *desc_table; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 746 | uword buffer_map_addr; |
| 747 | u32 buffer_len; |
| 748 | u16 bytes_left; |
| 749 | |
| 750 | if (PREDICT_TRUE (n_left > 1)) |
| 751 | vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD); |
| 752 | |
| 753 | b0 = vlib_get_buffer (vm, buffers[0]); |
| 754 | |
| 755 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 756 | { |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 757 | cpu->current_trace = vlib_add_trace (vm, node, b0, |
| 758 | sizeof (*cpu->current_trace)); |
| 759 | vhost_user_tx_trace (cpu->current_trace, vui, qid / 2, b0, rxvq); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx)) |
| 763 | { |
| 764 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; |
| 765 | goto done; |
| 766 | } |
| 767 | |
| 768 | desc_table = rxvq->desc; |
| 769 | desc_head = desc_index = |
| 770 | rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; |
| 771 | |
| 772 | /* Go deeper in case of indirect descriptor |
| 773 | * I don't know of any driver providing indirect for RX. */ |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 774 | if (PREDICT_FALSE (rxvq->desc[desc_head].flags & VRING_DESC_F_INDIRECT)) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 775 | { |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 776 | if (PREDICT_FALSE (rxvq->desc[desc_head].len < |
| 777 | sizeof (vnet_virtio_vring_desc_t))) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 778 | { |
| 779 | error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; |
| 780 | goto done; |
| 781 | } |
| 782 | if (PREDICT_FALSE |
| 783 | (!(desc_table = |
| 784 | map_guest_mem (vui, rxvq->desc[desc_index].addr, |
| 785 | &map_hint)))) |
| 786 | { |
| 787 | error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; |
| 788 | goto done; |
| 789 | } |
| 790 | desc_index = 0; |
| 791 | } |
| 792 | |
| 793 | desc_len = vui->virtio_net_hdr_sz; |
| 794 | buffer_map_addr = desc_table[desc_index].addr; |
| 795 | buffer_len = desc_table[desc_index].len; |
| 796 | |
| 797 | { |
| 798 | // Get a header from the header array |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 799 | vnet_virtio_net_hdr_mrg_rxbuf_t *hdr = |
| 800 | &cpu->tx_headers[tx_headers_len]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 801 | tx_headers_len++; |
| 802 | hdr->hdr.flags = 0; |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 803 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 804 | hdr->num_buffers = 1; //This is local, no need to check |
| 805 | |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 806 | or_flags = (b0->flags & VNET_BUFFER_F_OFFLOAD); |
Steven Luong | 564e167 | 2020-01-30 15:18:45 -0800 | [diff] [blame] | 807 | |
| 808 | /* Guest supports csum offload and buffer requires checksum offload? */ |
| 809 | if (or_flags |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 810 | && (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_GUEST_CSUM))) |
Steven Luong | 4208a4c | 2019-05-06 08:51:56 -0700 | [diff] [blame] | 811 | vhost_user_handle_tx_offload (vui, b0, &hdr->hdr); |
| 812 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 813 | // Prepare a copy order executed later for the header |
Steven Luong | 7331005 | 2019-10-23 13:28:37 -0700 | [diff] [blame] | 814 | ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 815 | vhost_copy_t *cpy = &cpu->copy[copy_len]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 816 | copy_len++; |
| 817 | cpy->len = vui->virtio_net_hdr_sz; |
| 818 | cpy->dst = buffer_map_addr; |
| 819 | cpy->src = (uword) hdr; |
| 820 | } |
| 821 | |
| 822 | buffer_map_addr += vui->virtio_net_hdr_sz; |
| 823 | buffer_len -= vui->virtio_net_hdr_sz; |
| 824 | bytes_left = b0->current_length; |
| 825 | current_b0 = b0; |
| 826 | while (1) |
| 827 | { |
| 828 | if (buffer_len == 0) |
| 829 | { //Get new output |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 830 | if (desc_table[desc_index].flags & VRING_DESC_F_NEXT) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 831 | { |
| 832 | //Next one is chained |
| 833 | desc_index = desc_table[desc_index].next; |
| 834 | buffer_map_addr = desc_table[desc_index].addr; |
| 835 | buffer_len = desc_table[desc_index].len; |
| 836 | } |
| 837 | else if (vui->virtio_net_hdr_sz == 12) //MRG is available |
| 838 | { |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 839 | vnet_virtio_net_hdr_mrg_rxbuf_t *hdr = |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 840 | &cpu->tx_headers[tx_headers_len - 1]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 841 | |
| 842 | //Move from available to used buffer |
| 843 | rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = |
| 844 | desc_head; |
| 845 | rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = |
| 846 | desc_len; |
| 847 | vhost_user_log_dirty_ring (vui, rxvq, |
| 848 | ring[rxvq->last_used_idx & |
| 849 | rxvq->qsz_mask]); |
| 850 | |
| 851 | rxvq->last_avail_idx++; |
| 852 | rxvq->last_used_idx++; |
| 853 | hdr->num_buffers++; |
| 854 | desc_len = 0; |
| 855 | |
| 856 | if (PREDICT_FALSE |
| 857 | (rxvq->last_avail_idx == rxvq->avail->idx)) |
| 858 | { |
| 859 | //Dequeue queued descriptors for this packet |
| 860 | rxvq->last_used_idx -= hdr->num_buffers - 1; |
| 861 | rxvq->last_avail_idx -= hdr->num_buffers - 1; |
| 862 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; |
| 863 | goto done; |
| 864 | } |
| 865 | |
| 866 | desc_table = rxvq->desc; |
| 867 | desc_head = desc_index = |
| 868 | rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; |
| 869 | if (PREDICT_FALSE |
Mohsin Kazmi | a7a2281 | 2020-08-31 17:17:16 +0200 | [diff] [blame] | 870 | (rxvq->desc[desc_head].flags & VRING_DESC_F_INDIRECT)) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 871 | { |
| 872 | //It is seriously unlikely that a driver will put indirect descriptor |
| 873 | //after non-indirect descriptor. |
Mohsin Kazmi | 0f8912f | 2022-02-01 18:35:59 +0000 | [diff] [blame^] | 874 | if (PREDICT_FALSE (rxvq->desc[desc_head].len < |
| 875 | sizeof (vnet_virtio_vring_desc_t))) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 876 | { |
| 877 | error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; |
| 878 | goto done; |
| 879 | } |
| 880 | if (PREDICT_FALSE |
| 881 | (!(desc_table = |
| 882 | map_guest_mem (vui, |
| 883 | rxvq->desc[desc_index].addr, |
| 884 | &map_hint)))) |
| 885 | { |
| 886 | error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; |
| 887 | goto done; |
| 888 | } |
| 889 | desc_index = 0; |
| 890 | } |
| 891 | buffer_map_addr = desc_table[desc_index].addr; |
| 892 | buffer_len = desc_table[desc_index].len; |
| 893 | } |
| 894 | else |
| 895 | { |
| 896 | error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; |
| 897 | goto done; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | { |
Steven Luong | 7331005 | 2019-10-23 13:28:37 -0700 | [diff] [blame] | 902 | ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 903 | vhost_copy_t *cpy = &cpu->copy[copy_len]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 904 | copy_len++; |
| 905 | cpy->len = bytes_left; |
| 906 | cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len; |
| 907 | cpy->dst = buffer_map_addr; |
| 908 | cpy->src = (uword) vlib_buffer_get_current (current_b0) + |
| 909 | current_b0->current_length - bytes_left; |
| 910 | |
| 911 | bytes_left -= cpy->len; |
| 912 | buffer_len -= cpy->len; |
| 913 | buffer_map_addr += cpy->len; |
| 914 | desc_len += cpy->len; |
| 915 | |
Damjan Marion | af7fb04 | 2021-07-15 11:54:41 +0200 | [diff] [blame] | 916 | clib_prefetch_load (&rxvq->desc); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | // Check if vlib buffer has more data. If not, get more or break. |
| 920 | if (PREDICT_TRUE (!bytes_left)) |
| 921 | { |
| 922 | if (PREDICT_FALSE |
| 923 | (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 924 | { |
| 925 | current_b0 = vlib_get_buffer (vm, current_b0->next_buffer); |
| 926 | bytes_left = current_b0->current_length; |
| 927 | } |
| 928 | else |
| 929 | { |
| 930 | //End of packet |
| 931 | break; |
| 932 | } |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | //Move from available to used ring |
| 937 | rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = desc_head; |
| 938 | rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = desc_len; |
| 939 | vhost_user_log_dirty_ring (vui, rxvq, |
| 940 | ring[rxvq->last_used_idx & rxvq->qsz_mask]); |
| 941 | rxvq->last_avail_idx++; |
| 942 | rxvq->last_used_idx++; |
| 943 | |
| 944 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 945 | { |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 946 | cpu->current_trace->hdr = cpu->tx_headers[tx_headers_len - 1]; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 947 | } |
| 948 | |
| 949 | n_left--; //At the end for error counting when 'goto done' is invoked |
| 950 | |
| 951 | /* |
| 952 | * Do the copy periodically to prevent |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 953 | * cpu->copy array overflow and corrupt memory |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 954 | */ |
| 955 | if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD)) |
| 956 | { |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 957 | if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len, |
| 958 | &map_hint))) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 959 | { |
| 960 | vlib_error_count (vm, node->node_index, |
| 961 | VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); |
| 962 | } |
| 963 | copy_len = 0; |
| 964 | |
| 965 | /* give buffers back to driver */ |
| 966 | CLIB_MEMORY_BARRIER (); |
| 967 | rxvq->used->idx = rxvq->last_used_idx; |
| 968 | vhost_user_log_dirty_ring (vui, rxvq, idx); |
| 969 | } |
| 970 | buffers++; |
| 971 | } |
| 972 | |
| 973 | done: |
| 974 | //Do the memory copies |
Damjan Marion | 7e0b17d | 2018-11-20 21:07:03 +0100 | [diff] [blame] | 975 | if (PREDICT_FALSE (vhost_user_tx_copy (vui, cpu->copy, copy_len, |
| 976 | &map_hint))) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 977 | { |
| 978 | vlib_error_count (vm, node->node_index, |
| 979 | VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); |
| 980 | } |
| 981 | |
| 982 | CLIB_MEMORY_BARRIER (); |
| 983 | rxvq->used->idx = rxvq->last_used_idx; |
| 984 | vhost_user_log_dirty_ring (vui, rxvq, idx); |
| 985 | |
| 986 | /* |
| 987 | * When n_left is set, error is always set to something too. |
| 988 | * In case error is due to lack of remaining buffers, we go back up and |
| 989 | * retry. |
| 990 | * The idea is that it is better to waste some time on packets |
| 991 | * that have been processed already than dropping them and get |
Paul Vinciguerra | 97c998c | 2019-10-29 16:11:09 -0400 | [diff] [blame] | 992 | * more fresh packets with a good likelihood that they will be dropped too. |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 993 | * This technique also gives more time to VM driver to pick-up packets. |
| 994 | * In case the traffic flows from physical to virtual interfaces, this |
| 995 | * technique will end-up leveraging the physical NIC buffer in order to |
| 996 | * absorb the VM's CPU jitter. |
| 997 | */ |
| 998 | if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry) |
| 999 | { |
| 1000 | retry--; |
| 1001 | goto retry; |
| 1002 | } |
| 1003 | |
| 1004 | /* interrupt (call) handling */ |
| 1005 | if ((rxvq->callfd_idx != ~0) && |
| 1006 | !(rxvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) |
| 1007 | { |
| 1008 | rxvq->n_since_last_int += frame->n_vectors - n_left; |
| 1009 | |
| 1010 | if (rxvq->n_since_last_int > vum->coalesce_frames) |
Steven Luong | 27ba500 | 2020-11-17 13:30:44 -0800 | [diff] [blame] | 1011 | vhost_user_send_call (vm, vui, rxvq); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1012 | } |
| 1013 | |
Steven Luong | ce50758 | 2021-08-23 14:31:16 -0700 | [diff] [blame] | 1014 | clib_spinlock_unlock (&rxvq->vring_lock); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1015 | |
| 1016 | done3: |
| 1017 | if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE)) |
| 1018 | { |
| 1019 | vlib_error_count (vm, node->node_index, error, n_left); |
| 1020 | vlib_increment_simple_counter |
| 1021 | (vnet_main.interface_main.sw_if_counters |
| 1022 | + VNET_INTERFACE_COUNTER_DROP, |
| 1023 | thread_index, vui->sw_if_index, n_left); |
| 1024 | } |
| 1025 | |
Damjan Marion | a3d5986 | 2018-11-10 10:23:00 +0100 | [diff] [blame] | 1026 | vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1027 | return frame->n_vectors; |
| 1028 | } |
| 1029 | |
| 1030 | static __clib_unused clib_error_t * |
| 1031 | vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, |
Damjan Marion | eabd424 | 2020-10-07 20:59:07 +0200 | [diff] [blame] | 1032 | u32 qid, vnet_hw_if_rx_mode mode) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1033 | { |
| 1034 | vlib_main_t *vm = vnm->vlib_main; |
| 1035 | vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); |
| 1036 | vhost_user_main_t *vum = &vhost_user_main; |
| 1037 | vhost_user_intf_t *vui = |
| 1038 | pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); |
| 1039 | vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1040 | vhost_cpu_t *cpu; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1041 | |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1042 | if (mode == txvq->mode) |
| 1043 | return 0; |
| 1044 | |
| 1045 | if ((mode != VNET_HW_IF_RX_MODE_POLLING) && |
| 1046 | (mode != VNET_HW_IF_RX_MODE_ADAPTIVE) && |
| 1047 | (mode != VNET_HW_IF_RX_MODE_INTERRUPT)) |
| 1048 | { |
| 1049 | vu_log_err (vui, "unhandled mode %d changed for if %d queue %d", mode, |
| 1050 | hw_if_index, qid); |
| 1051 | return clib_error_return (0, "unsupported"); |
| 1052 | } |
| 1053 | |
| 1054 | if (txvq->thread_index == ~0) |
| 1055 | return clib_error_return (0, "Queue initialization is not finished yet"); |
| 1056 | |
| 1057 | cpu = vec_elt_at_index (vum->cpus, txvq->thread_index); |
Damjan Marion | eabd424 | 2020-10-07 20:59:07 +0200 | [diff] [blame] | 1058 | if ((mode == VNET_HW_IF_RX_MODE_INTERRUPT) || |
| 1059 | (mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1060 | { |
| 1061 | if (txvq->kickfd_idx == ~0) |
| 1062 | { |
| 1063 | // We cannot support interrupt mode if the driver opts out |
| 1064 | return clib_error_return (0, "Driver does not support interrupt"); |
| 1065 | } |
Damjan Marion | eabd424 | 2020-10-07 20:59:07 +0200 | [diff] [blame] | 1066 | if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1067 | { |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1068 | ASSERT (cpu->polling_q_count != 0); |
| 1069 | if (cpu->polling_q_count) |
| 1070 | cpu->polling_q_count--; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1071 | vum->ifq_count++; |
| 1072 | // Start the timer if this is the first encounter on interrupt |
| 1073 | // interface/queue |
| 1074 | if ((vum->ifq_count == 1) && |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1075 | ((vum->coalesce_time > 0.0) || (vum->coalesce_frames > 0))) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1076 | vlib_process_signal_event (vm, |
| 1077 | vhost_user_send_interrupt_node.index, |
| 1078 | VHOST_USER_EVENT_START_TIMER, 0); |
| 1079 | } |
| 1080 | } |
Damjan Marion | eabd424 | 2020-10-07 20:59:07 +0200 | [diff] [blame] | 1081 | else if (mode == VNET_HW_IF_RX_MODE_POLLING) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1082 | { |
Damjan Marion | eabd424 | 2020-10-07 20:59:07 +0200 | [diff] [blame] | 1083 | if (((txvq->mode == VNET_HW_IF_RX_MODE_INTERRUPT) || |
| 1084 | (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) && vum->ifq_count) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1085 | { |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1086 | cpu->polling_q_count++; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1087 | vum->ifq_count--; |
| 1088 | // Stop the timer if there is no more interrupt interface/queue |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1089 | if (vum->ifq_count == 0) |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1090 | vlib_process_signal_event (vm, |
| 1091 | vhost_user_send_interrupt_node.index, |
| 1092 | VHOST_USER_EVENT_STOP_TIMER, 0); |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | txvq->mode = mode; |
Steven Luong | 38071b1 | 2021-04-21 09:54:34 -0700 | [diff] [blame] | 1097 | vhost_user_set_operation_mode (vui, txvq); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1098 | |
| 1099 | return 0; |
| 1100 | } |
| 1101 | |
| 1102 | static __clib_unused clib_error_t * |
| 1103 | vhost_user_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, |
| 1104 | u32 flags) |
| 1105 | { |
| 1106 | vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); |
| 1107 | vhost_user_main_t *vum = &vhost_user_main; |
| 1108 | vhost_user_intf_t *vui = |
| 1109 | pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); |
Juraj Sloboda | b192feb | 2018-10-01 12:42:07 +0200 | [diff] [blame] | 1110 | u8 link_old, link_new; |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1111 | |
Juraj Sloboda | b192feb | 2018-10-01 12:42:07 +0200 | [diff] [blame] | 1112 | link_old = vui_is_link_up (vui); |
| 1113 | |
| 1114 | vui->admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; |
| 1115 | |
| 1116 | link_new = vui_is_link_up (vui); |
| 1117 | |
| 1118 | if (link_old != link_new) |
| 1119 | vnet_hw_interface_set_flags (vnm, vui->hw_if_index, link_new ? |
| 1120 | VNET_HW_INTERFACE_FLAG_LINK_UP : 0); |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1121 | |
| 1122 | return /* no error */ 0; |
| 1123 | } |
| 1124 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1125 | /* *INDENT-OFF* */ |
| 1126 | VNET_DEVICE_CLASS (vhost_user_device_class) = { |
| 1127 | .name = "vhost-user", |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1128 | .tx_function_n_errors = VHOST_USER_TX_FUNC_N_ERROR, |
| 1129 | .tx_function_error_strings = vhost_user_tx_func_error_strings, |
| 1130 | .format_device_name = format_vhost_user_interface_name, |
| 1131 | .name_renumber = vhost_user_name_renumber, |
| 1132 | .admin_up_down_function = vhost_user_interface_admin_up_down, |
| 1133 | .rx_mode_change_function = vhost_user_interface_rx_mode_change, |
| 1134 | .format_tx_trace = format_vhost_trace, |
| 1135 | }; |
| 1136 | |
Mohsin Kazmi | e7cde31 | 2018-06-26 17:20:11 +0200 | [diff] [blame] | 1137 | /* *INDENT-ON* */ |
| 1138 | |
| 1139 | /* |
| 1140 | * fd.io coding-style-patch-verification: ON |
| 1141 | * |
| 1142 | * Local Variables: |
| 1143 | * eval: (c-set-style "gnu") |
| 1144 | * End: |
| 1145 | */ |