ceph/src/dpdk/drivers/net/virtio/virtqueue.h

   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 #include "virtio_rxtx.h"
  48
  49 struct rte_mbuf;
  50
  51 /*
  52  * Per virtio_config.h in Linux.
  53  *     For virtio_pci on SMP, we don't need to order with respect to MMIO
  54  *     accesses through relaxed memory I/O windows, so smp_mb() et al are
  55  *     sufficient.
  56  *
  57  */
  58 #define virtio_mb()     rte_smp_mb()
  59 #define virtio_rmb()    rte_smp_rmb()
  60 #define virtio_wmb()    rte_smp_wmb()
  61
  62 #ifdef RTE_PMD_PACKET_PREFETCH
  63 #define rte_packet_prefetch(p)  rte_prefetch1(p)
  64 #else
  65 #define rte_packet_prefetch(p)  do {} while(0)
  66 #endif
  67
  68 #define VIRTQUEUE_MAX_NAME_SZ 32
  69
  70 #ifdef RTE_VIRTIO_USER
  71 /**
  72  * Return the physical address (or virtual address in case of
  73  * virtio-user) of mbuf data buffer.
  74  */
  75 #define VIRTIO_MBUF_ADDR(mb, vq) (*(uint64_t *)((uintptr_t)(mb) + (vq)->offset))
  76 #else
  77 #define VIRTIO_MBUF_ADDR(mb, vq) ((mb)->buf_physaddr)
  78 #endif
  79
  80 /**
  81  * Return the physical address (or virtual address in case of
  82  * virtio-user) of mbuf data buffer, taking care of mbuf data offset
  83  */
  84 #define VIRTIO_MBUF_DATA_DMA_ADDR(mb, vq) \
  85         (VIRTIO_MBUF_ADDR(mb, vq) + (mb)->data_off)
  86
  87 #define VTNET_SQ_RQ_QUEUE_IDX 0
  88 #define VTNET_SQ_TQ_QUEUE_IDX 1
  89 #define VTNET_SQ_CQ_QUEUE_IDX 2
  90
  91 enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
  92 /**
  93  * The maximum virtqueue size is 2^15. Use that value as the end of
  94  * descriptor chain terminator since it will never be a valid index
  95  * in the descriptor table. This is used to verify we are correctly
  96  * handling vq_free_cnt.
  97  */
  98 #define VQ_RING_DESC_CHAIN_END 32768
  99
 100 /**
 101  * Control the RX mode, ie. promiscuous, allmulti, etc...
 102  * All commands require an "out" sg entry containing a 1 byte
 103  * state value, zero = disable, non-zero = enable.  Commands
 104  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
 105  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
 106  */
 107 #define VIRTIO_NET_CTRL_RX              0
 108 #define VIRTIO_NET_CTRL_RX_PROMISC      0
 109 #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
 110 #define VIRTIO_NET_CTRL_RX_ALLUNI       2
 111 #define VIRTIO_NET_CTRL_RX_NOMULTI      3
 112 #define VIRTIO_NET_CTRL_RX_NOUNI        4
 113 #define VIRTIO_NET_CTRL_RX_NOBCAST      5
 114
 115 /**
 116  * Control the MAC
 117  *
 118  * The MAC filter table is managed by the hypervisor, the guest should
 119  * assume the size is infinite.  Filtering should be considered
 120  * non-perfect, ie. based on hypervisor resources, the guest may
 121  * received packets from sources not specified in the filter list.
 122  *
 123  * In addition to the class/cmd header, the TABLE_SET command requires
 124  * two out scatterlists.  Each contains a 4 byte count of entries followed
 125  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 126  * first sg list contains unicast addresses, the second is for multicast.
 127  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 128  * is available.
 129  *
 130  * The ADDR_SET command requests one out scatterlist, it contains a
 131  * 6 bytes MAC address. This functionality is present if the
 132  * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
 133  */
 134 struct virtio_net_ctrl_mac {
 135         uint32_t entries;
 136         uint8_t macs[][ETHER_ADDR_LEN];
 137 } __attribute__((__packed__));
 138
 139 #define VIRTIO_NET_CTRL_MAC    1
 140  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 141  #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
 142
 143 /**
 144  * Control VLAN filtering
 145  *
 146  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 147  * VLAN IDs not added may be filtered by the hypervisor.  Del is the
 148  * opposite of add.  Both commands expect an out entry containing a 2
 149  * byte VLAN ID.  VLAN filtering is available with the
 150  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 151  */
 152 #define VIRTIO_NET_CTRL_VLAN     2
 153 #define VIRTIO_NET_CTRL_VLAN_ADD 0
 154 #define VIRTIO_NET_CTRL_VLAN_DEL 1
 155
 156 struct virtio_net_ctrl_hdr {
 157         uint8_t class;
 158         uint8_t cmd;
 159 } __attribute__((packed));
 160
 161 typedef uint8_t virtio_net_ctrl_ack;
 162
 163 #define VIRTIO_NET_OK     0
 164 #define VIRTIO_NET_ERR    1
 165
 166 #define VIRTIO_MAX_CTRL_DATA 2048
 167
 168 struct virtio_pmd_ctrl {
 169         struct virtio_net_ctrl_hdr hdr;
 170         virtio_net_ctrl_ack status;
 171         uint8_t data[VIRTIO_MAX_CTRL_DATA];
 172 };
 173
 174 struct vq_desc_extra {
 175         void *cookie;
 176         uint16_t ndescs;
 177 };
 178
 179 struct virtqueue {
 180         struct virtio_hw  *hw; /**< virtio_hw structure pointer. */
 181         struct vring vq_ring;  /**< vring keeping desc, used and avail */
 182         /**
 183          * Last consumed descriptor in the used table,
 184          * trails vq_ring.used->idx.
 185          */
 186         uint16_t vq_used_cons_idx;
 187         uint16_t vq_nentries;  /**< vring desc numbers */
 188         uint16_t vq_free_cnt;  /**< num of desc available */
 189         uint16_t vq_avail_idx; /**< sync until needed */
 190         uint16_t vq_free_thresh; /**< free threshold */
 191
 192         void *vq_ring_virt_mem;  /**< linear address of vring*/
 193         unsigned int vq_ring_size;
 194
 195         union {
 196                 struct virtnet_rx rxq;
 197                 struct virtnet_tx txq;
 198                 struct virtnet_ctl cq;
 199         };
 200
 201         phys_addr_t vq_ring_mem; /**< physical address of vring,
 202                                   * or virtual address for virtio_user. */
 203
 204         /**
 205          * Head of the free chain in the descriptor table. If
 206          * there are no free descriptors, this will be set to
 207          * VQ_RING_DESC_CHAIN_END.
 208          */
 209         uint16_t  vq_desc_head_idx;
 210         uint16_t  vq_desc_tail_idx;
 211         uint16_t  vq_queue_index;   /**< PCI queue index */
 212         uint16_t offset; /**< relative offset to obtain addr in mbuf */
 213         uint16_t  *notify_addr;
 214         struct rte_mbuf **sw_ring;  /**< RX software ring. */
 215         struct vq_desc_extra vq_descx[0];
 216 };
 217
 218 /* If multiqueue is provided by host, then we suppport it. */
 219 #define VIRTIO_NET_CTRL_MQ   4
 220 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
 221 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
 222 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
 223
 224 #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
 225
 226 /**
 227  * This is the first element of the scatter-gather list.  If you don't
 228  * specify GSO or CSUM features, you can simply ignore the header.
 229  */
 230 struct virtio_net_hdr {
 231 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1    /**< Use csum_start,csum_offset*/
 232 #define VIRTIO_NET_HDR_F_DATA_VALID 2    /**< Checksum is valid */
 233         uint8_t flags;
 234 #define VIRTIO_NET_HDR_GSO_NONE     0    /**< Not a GSO frame */
 235 #define VIRTIO_NET_HDR_GSO_TCPV4    1    /**< GSO frame, IPv4 TCP (TSO) */
 236 #define VIRTIO_NET_HDR_GSO_UDP      3    /**< GSO frame, IPv4 UDP (UFO) */
 237 #define VIRTIO_NET_HDR_GSO_TCPV6    4    /**< GSO frame, IPv6 TCP */
 238 #define VIRTIO_NET_HDR_GSO_ECN      0x80 /**< TCP has ECN set */
 239         uint8_t gso_type;
 240         uint16_t hdr_len;     /**< Ethernet + IP + tcp/udp hdrs */
 241         uint16_t gso_size;    /**< Bytes to append to hdr_len per frame */
 242         uint16_t csum_start;  /**< Position to start checksumming from */
 243         uint16_t csum_offset; /**< Offset after that to place checksum */
 244 };
 245
 246 /**
 247  * This is the version of the header to use when the MRG_RXBUF
 248  * feature has been negotiated.
 249  */
 250 struct virtio_net_hdr_mrg_rxbuf {
 251         struct   virtio_net_hdr hdr;
 252         uint16_t num_buffers; /**< Number of merged rx buffers */
 253 };
 254
 255 /* Region reserved to allow for transmit header and indirect ring */
 256 #define VIRTIO_MAX_TX_INDIRECT 8
 257 struct virtio_tx_region {
 258         struct virtio_net_hdr_mrg_rxbuf tx_hdr;
 259         struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
 260                            __attribute__((__aligned__(16)));
 261 };
 262
 263 /* Chain all the descriptors in the ring with an END */
 264 static inline void
 265 vring_desc_init(struct vring_desc *dp, uint16_t n)
 266 {
 267         uint16_t i;
 268
 269         for (i = 0; i < n - 1; i++)
 270                 dp[i].next = (uint16_t)(i + 1);
 271         dp[i].next = VQ_RING_DESC_CHAIN_END;
 272 }
 273
 274 /**
 275  * Tell the backend not to interrupt us.
 276  */
 277 void virtqueue_disable_intr(struct virtqueue *vq);
 278 /**
 279  *  Dump virtqueue internal structures, for debug purpose only.
 280  */
 281 void virtqueue_dump(struct virtqueue *vq);
 282 /**
 283  *  Get all mbufs to be freed.
 284  */
 285 struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq);
 286
 287 static inline int
 288 virtqueue_full(const struct virtqueue *vq)
 289 {
 290         return vq->vq_free_cnt == 0;
 291 }
 292
 293 #define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
 294
 295 static inline void
 296 vq_update_avail_idx(struct virtqueue *vq)
 297 {
 298         virtio_wmb();
 299         vq->vq_ring.avail->idx = vq->vq_avail_idx;
 300 }
 301
 302 static inline void
 303 vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
 304 {
 305         uint16_t avail_idx;
 306         /*
 307          * Place the head of the descriptor chain into the next slot and make
 308          * it usable to the host. The chain is made available now rather than
 309          * deferring to virtqueue_notify() in the hopes that if the host is
 310          * currently running on another CPU, we can keep it processing the new
 311          * descriptor.
 312          */
 313         avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
 314         if (unlikely(vq->vq_ring.avail->ring[avail_idx] != desc_idx))
 315                 vq->vq_ring.avail->ring[avail_idx] = desc_idx;
 316         vq->vq_avail_idx++;
 317 }
 318
 319 static inline int
 320 virtqueue_kick_prepare(struct virtqueue *vq)
 321 {
 322         return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
 323 }
 324
 325 static inline void
 326 virtqueue_notify(struct virtqueue *vq)
 327 {
 328         /*
 329          * Ensure updated avail->idx is visible to host.
 330          * For virtio on IA, the notificaiton is through io port operation
 331          * which is a serialization instruction itself.
 332          */
 333         vq->hw->vtpci_ops->notify_queue(vq->hw, vq);
 334 }
 335
 336 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
 337 #define VIRTQUEUE_DUMP(vq) do { \
 338         uint16_t used_idx, nused; \
 339         used_idx = (vq)->vq_ring.used->idx; \
 340         nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
 341         PMD_INIT_LOG(DEBUG, \
 342           "VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
 343           " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
 344           " avail.flags=0x%x; used.flags=0x%x", \
 345           (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
 346           (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
 347           (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
 348           (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
 349 } while (0)
 350 #else
 351 #define VIRTQUEUE_DUMP(vq) do { } while (0)
 352 #endif
 353
 354 #endif /* _VIRTQUEUE_H_ */