1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef _VIRTQUEUE_H_ 35 #define _VIRTQUEUE_H_ 36 37 #include <stdint.h> 38 39 #include <rte_atomic.h> 40 #include <rte_memory.h> 41 #include <rte_memzone.h> 42 #include <rte_mempool.h> 43 44 #include "virtio_pci.h" 45 #include "virtio_ring.h" 46 #include "virtio_logs.h" 47 48 struct rte_mbuf; 49 50 /* 51 * Per virtio_config.h in Linux. 52 * For virtio_pci on SMP, we don't need to order with respect to MMIO 53 * accesses through relaxed memory I/O windows, so smp_mb() et al are 54 * sufficient. 55 * 56 */ 57 #define virtio_mb() rte_smp_mb() 58 #define virtio_rmb() rte_smp_rmb() 59 #define virtio_wmb() rte_smp_wmb() 60 61 #ifdef RTE_PMD_PACKET_PREFETCH 62 #define rte_packet_prefetch(p) rte_prefetch1(p) 63 #else 64 #define rte_packet_prefetch(p) do {} while(0) 65 #endif 66 67 #define VIRTQUEUE_MAX_NAME_SZ 32 68 69 #define RTE_MBUF_DATA_DMA_ADDR(mb) \ 70 (uint64_t) ((mb)->buf_physaddr + (mb)->data_off) 71 72 #define VTNET_SQ_RQ_QUEUE_IDX 0 73 #define VTNET_SQ_TQ_QUEUE_IDX 1 74 #define VTNET_SQ_CQ_QUEUE_IDX 2 75 76 enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 }; 77 /** 78 * The maximum virtqueue size is 2^15. Use that value as the end of 79 * descriptor chain terminator since it will never be a valid index 80 * in the descriptor table. This is used to verify we are correctly 81 * handling vq_free_cnt. 82 */ 83 #define VQ_RING_DESC_CHAIN_END 32768 84 85 /** 86 * Control the RX mode, ie. promiscuous, allmulti, etc... 87 * All commands require an "out" sg entry containing a 1 byte 88 * state value, zero = disable, non-zero = enable. Commands 89 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. 90 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. 91 */ 92 #define VIRTIO_NET_CTRL_RX 0 93 #define VIRTIO_NET_CTRL_RX_PROMISC 0 94 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 95 #define VIRTIO_NET_CTRL_RX_ALLUNI 2 96 #define VIRTIO_NET_CTRL_RX_NOMULTI 3 97 #define VIRTIO_NET_CTRL_RX_NOUNI 4 98 #define VIRTIO_NET_CTRL_RX_NOBCAST 5 99 100 /** 101 * Control the MAC 102 * 103 * The MAC filter table is managed by the hypervisor, the guest should 104 * assume the size is infinite. Filtering should be considered 105 * non-perfect, ie. based on hypervisor resources, the guest may 106 * received packets from sources not specified in the filter list. 107 * 108 * In addition to the class/cmd header, the TABLE_SET command requires 109 * two out scatterlists. Each contains a 4 byte count of entries followed 110 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 111 * first sg list contains unicast addresses, the second is for multicast. 112 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 113 * is available. 114 * 115 * The ADDR_SET command requests one out scatterlist, it contains a 116 * 6 bytes MAC address. This functionality is present if the 117 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. 118 */ 119 struct virtio_net_ctrl_mac { 120 uint32_t entries; 121 uint8_t macs[][ETHER_ADDR_LEN]; 122 } __attribute__((__packed__)); 123 124 #define VIRTIO_NET_CTRL_MAC 1 125 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 126 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 127 128 /** 129 * Control VLAN filtering 130 * 131 * The VLAN filter table is controlled via a simple ADD/DEL interface. 132 * VLAN IDs not added may be filtered by the hypervisor. Del is the 133 * opposite of add. Both commands expect an out entry containing a 2 134 * byte VLAN ID. VLAN filtering is available with the 135 * VIRTIO_NET_F_CTRL_VLAN feature bit. 136 */ 137 #define VIRTIO_NET_CTRL_VLAN 2 138 #define VIRTIO_NET_CTRL_VLAN_ADD 0 139 #define VIRTIO_NET_CTRL_VLAN_DEL 1 140 141 struct virtio_net_ctrl_hdr { 142 uint8_t class; 143 uint8_t cmd; 144 } __attribute__((packed)); 145 146 typedef uint8_t virtio_net_ctrl_ack; 147 148 #define VIRTIO_NET_OK 0 149 #define VIRTIO_NET_ERR 1 150 151 #define VIRTIO_MAX_CTRL_DATA 2048 152 153 struct virtio_pmd_ctrl { 154 struct virtio_net_ctrl_hdr hdr; 155 virtio_net_ctrl_ack status; 156 uint8_t data[VIRTIO_MAX_CTRL_DATA]; 157 }; 158 159 struct virtqueue { 160 struct virtio_hw *hw; /**< virtio_hw structure pointer. */ 161 const struct rte_memzone *mz; /**< mem zone to populate RX ring. */ 162 const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */ 163 struct rte_mempool *mpool; /**< mempool for mbuf allocation */ 164 uint16_t queue_id; /**< DPDK queue index. */ 165 uint8_t port_id; /**< Device port identifier. */ 166 uint16_t vq_queue_index; /**< PCI queue index */ 167 168 void *vq_ring_virt_mem; /**< linear address of vring*/ 169 unsigned int vq_ring_size; 170 phys_addr_t vq_ring_mem; /**< physical address of vring */ 171 172 struct vring vq_ring; /**< vring keeping desc, used and avail */ 173 uint16_t vq_free_cnt; /**< num of desc available */ 174 uint16_t vq_nentries; /**< vring desc numbers */ 175 uint16_t vq_free_thresh; /**< free threshold */ 176 /** 177 * Head of the free chain in the descriptor table. If 178 * there are no free descriptors, this will be set to 179 * VQ_RING_DESC_CHAIN_END. 180 */ 181 uint16_t vq_desc_head_idx; 182 uint16_t vq_desc_tail_idx; 183 /** 184 * Last consumed descriptor in the used table, 185 * trails vq_ring.used->idx. 186 */ 187 uint16_t vq_used_cons_idx; 188 uint16_t vq_avail_idx; 189 uint64_t mbuf_initializer; /**< value to init mbufs. */ 190 phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */ 191 192 struct rte_mbuf **sw_ring; /**< RX software ring. */ 193 /* dummy mbuf, for wraparound when processing RX ring. */ 194 struct rte_mbuf fake_mbuf; 195 196 /* Statistics */ 197 uint64_t packets; 198 uint64_t bytes; 199 uint64_t errors; 200 uint64_t multicast; 201 uint64_t broadcast; 202 /* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */ 203 uint64_t size_bins[8]; 204 205 struct vq_desc_extra { 206 void *cookie; 207 uint16_t ndescs; 208 } vq_descx[0]; 209 }; 210 211 /* If multiqueue is provided by host, then we suppport it. */ 212 #define VIRTIO_NET_CTRL_MQ 4 213 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 214 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 215 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 216 217 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 218 219 /** 220 * This is the first element of the scatter-gather list. If you don't 221 * specify GSO or CSUM features, you can simply ignore the header. 222 */ 223 struct virtio_net_hdr { 224 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /**< Use csum_start,csum_offset*/ 225 uint8_t flags; 226 #define VIRTIO_NET_HDR_GSO_NONE 0 /**< Not a GSO frame */ 227 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /**< GSO frame, IPv4 TCP (TSO) */ 228 #define VIRTIO_NET_HDR_GSO_UDP 3 /**< GSO frame, IPv4 UDP (UFO) */ 229 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /**< GSO frame, IPv6 TCP */ 230 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /**< TCP has ECN set */ 231 uint8_t gso_type; 232 uint16_t hdr_len; /**< Ethernet + IP + tcp/udp hdrs */ 233 uint16_t gso_size; /**< Bytes to append to hdr_len per frame */ 234 uint16_t csum_start; /**< Position to start checksumming from */ 235 uint16_t csum_offset; /**< Offset after that to place checksum */ 236 }; 237 238 /** 239 * This is the version of the header to use when the MRG_RXBUF 240 * feature has been negotiated. 241 */ 242 struct virtio_net_hdr_mrg_rxbuf { 243 struct virtio_net_hdr hdr; 244 uint16_t num_buffers; /**< Number of merged rx buffers */ 245 }; 246 247 /** 248 * Tell the backend not to interrupt us. 249 */ 250 void virtqueue_disable_intr(struct virtqueue *vq); 251 /** 252 * Dump virtqueue internal structures, for debug purpose only. 253 */ 254 void virtqueue_dump(struct virtqueue *vq); 255 /** 256 * Get all mbufs to be freed. 257 */ 258 struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq); 259 260 static inline int 261 virtqueue_full(const struct virtqueue *vq) 262 { 263 return vq->vq_free_cnt == 0; 264 } 265 266 #define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx)) 267 268 static inline void 269 vq_update_avail_idx(struct virtqueue *vq) 270 { 271 virtio_wmb(); 272 vq->vq_ring.avail->idx = vq->vq_avail_idx; 273 } 274 275 static inline void 276 vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx) 277 { 278 uint16_t avail_idx; 279 /* 280 * Place the head of the descriptor chain into the next slot and make 281 * it usable to the host. The chain is made available now rather than 282 * deferring to virtqueue_notify() in the hopes that if the host is 283 * currently running on another CPU, we can keep it processing the new 284 * descriptor. 285 */ 286 avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1)); 287 vq->vq_ring.avail->ring[avail_idx] = desc_idx; 288 vq->vq_avail_idx++; 289 } 290 291 static inline int 292 virtqueue_kick_prepare(struct virtqueue *vq) 293 { 294 return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY); 295 } 296 297 static inline void 298 virtqueue_notify(struct virtqueue *vq) 299 { 300 /* 301 * Ensure updated avail->idx is visible to host. 302 * For virtio on IA, the notificaiton is through io port operation 303 * which is a serialization instruction itself. 304 */ 305 VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_NOTIFY, vq->vq_queue_index); 306 } 307 308 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP 309 #define VIRTQUEUE_DUMP(vq) do { \ 310 uint16_t used_idx, nused; \ 311 used_idx = (vq)->vq_ring.used->idx; \ 312 nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \ 313 PMD_INIT_LOG(DEBUG, \ 314 "VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \ 315 " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \ 316 " avail.flags=0x%x; used.flags=0x%x", \ 317 (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \ 318 (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \ 319 (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \ 320 (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \ 321 } while (0) 322 #else 323 #define VIRTQUEUE_DUMP(vq) do { } while (0) 324 #endif 325 326 #endif /* _VIRTQUEUE_H_ */ 327