ceph/src/seastar/dpdk/lib/librte_net/rte_ether.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 _RTE_ETHER_H_
  35 #define _RTE_ETHER_H_
  36
  37 /**
  38  * @file
  39  *
  40  * Ethernet Helpers in RTE
  41  */
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #include <stdint.h>
  48 #include <stdio.h>
  49
  50 #include <rte_memcpy.h>
  51 #include <rte_random.h>
  52 #include <rte_mbuf.h>
  53 #include <rte_byteorder.h>
  54
  55 #define ETHER_ADDR_LEN  6 /**< Length of Ethernet address. */
  56 #define ETHER_TYPE_LEN  2 /**< Length of Ethernet type field. */
  57 #define ETHER_CRC_LEN   4 /**< Length of Ethernet CRC. */
  58 #define ETHER_HDR_LEN   \
  59         (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) /**< Length of Ethernet header. */
  60 #define ETHER_MIN_LEN   64    /**< Minimum frame len, including CRC. */
  61 #define ETHER_MAX_LEN   1518  /**< Maximum frame len, including CRC. */
  62 #define ETHER_MTU       \
  63         (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) /**< Ethernet MTU. */
  64
  65 #define ETHER_MAX_VLAN_FRAME_LEN \
  66         (ETHER_MAX_LEN + 4) /**< Maximum VLAN frame length, including CRC. */
  67
  68 #define ETHER_MAX_JUMBO_FRAME_LEN \
  69         0x3F00 /**< Maximum Jumbo frame length, including CRC. */
  70
  71 #define ETHER_MAX_VLAN_ID  4095 /**< Maximum VLAN ID. */
  72
  73 #define ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */
  74
  75 /**
  76  * Ethernet address:
  77  * A universally administered address is uniquely assigned to a device by its
  78  * manufacturer. The first three octets (in transmission order) contain the
  79  * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
  80  * EUI-48) octets are assigned by that organization with the only constraint
  81  * of uniqueness.
  82  * A locally administered address is assigned to a device by a network
  83  * administrator and does not contain OUIs.
  84  * See http://standards.ieee.org/regauth/groupmac/tutorial.html
  85  */
  86 struct ether_addr {
  87         uint8_t addr_bytes[ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
  88 } __attribute__((__packed__));
  89
  90 #define ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
  91 #define ETHER_GROUP_ADDR       0x01 /**< Multicast or broadcast Eth. address. */
  92
  93 /**
  94  * Check if two Ethernet addresses are the same.
  95  *
  96  * @param ea1
  97  *  A pointer to the first ether_addr structure containing
  98  *  the ethernet address.
  99  * @param ea2
 100  *  A pointer to the second ether_addr structure containing
 101  *  the ethernet address.
 102  *
 103  * @return
 104  *  True  (1) if the given two ethernet address are the same;
 105  *  False (0) otherwise.
 106  */
 107 static inline int is_same_ether_addr(const struct ether_addr *ea1,
 108                                      const struct ether_addr *ea2)
 109 {
 110         int i;
 111         for (i = 0; i < ETHER_ADDR_LEN; i++)
 112                 if (ea1->addr_bytes[i] != ea2->addr_bytes[i])
 113                         return 0;
 114         return 1;
 115 }
 116
 117 /**
 118  * Check if an Ethernet address is filled with zeros.
 119  *
 120  * @param ea
 121  *   A pointer to a ether_addr structure containing the ethernet address
 122  *   to check.
 123  * @return
 124  *   True  (1) if the given ethernet address is filled with zeros;
 125  *   false (0) otherwise.
 126  */
 127 static inline int is_zero_ether_addr(const struct ether_addr *ea)
 128 {
 129         int i;
 130         for (i = 0; i < ETHER_ADDR_LEN; i++)
 131                 if (ea->addr_bytes[i] != 0x00)
 132                         return 0;
 133         return 1;
 134 }
 135
 136 /**
 137  * Check if an Ethernet address is a unicast address.
 138  *
 139  * @param ea
 140  *   A pointer to a ether_addr structure containing the ethernet address
 141  *   to check.
 142  * @return
 143  *   True  (1) if the given ethernet address is a unicast address;
 144  *   false (0) otherwise.
 145  */
 146 static inline int is_unicast_ether_addr(const struct ether_addr *ea)
 147 {
 148         return (ea->addr_bytes[0] & ETHER_GROUP_ADDR) == 0;
 149 }
 150
 151 /**
 152  * Check if an Ethernet address is a multicast address.
 153  *
 154  * @param ea
 155  *   A pointer to a ether_addr structure containing the ethernet address
 156  *   to check.
 157  * @return
 158  *   True  (1) if the given ethernet address is a multicast address;
 159  *   false (0) otherwise.
 160  */
 161 static inline int is_multicast_ether_addr(const struct ether_addr *ea)
 162 {
 163         return ea->addr_bytes[0] & ETHER_GROUP_ADDR;
 164 }
 165
 166 /**
 167  * Check if an Ethernet address is a broadcast address.
 168  *
 169  * @param ea
 170  *   A pointer to a ether_addr structure containing the ethernet address
 171  *   to check.
 172  * @return
 173  *   True  (1) if the given ethernet address is a broadcast address;
 174  *   false (0) otherwise.
 175  */
 176 static inline int is_broadcast_ether_addr(const struct ether_addr *ea)
 177 {
 178         const unaligned_uint16_t *ea_words = (const unaligned_uint16_t *)ea;
 179
 180         return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
 181                 ea_words[2] == 0xFFFF);
 182 }
 183
 184 /**
 185  * Check if an Ethernet address is a universally assigned address.
 186  *
 187  * @param ea
 188  *   A pointer to a ether_addr structure containing the ethernet address
 189  *   to check.
 190  * @return
 191  *   True  (1) if the given ethernet address is a universally assigned address;
 192  *   false (0) otherwise.
 193  */
 194 static inline int is_universal_ether_addr(const struct ether_addr *ea)
 195 {
 196         return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 0;
 197 }
 198
 199 /**
 200  * Check if an Ethernet address is a locally assigned address.
 201  *
 202  * @param ea
 203  *   A pointer to a ether_addr structure containing the ethernet address
 204  *   to check.
 205  * @return
 206  *   True  (1) if the given ethernet address is a locally assigned address;
 207  *   false (0) otherwise.
 208  */
 209 static inline int is_local_admin_ether_addr(const struct ether_addr *ea)
 210 {
 211         return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) != 0;
 212 }
 213
 214 /**
 215  * Check if an Ethernet address is a valid address. Checks that the address is a
 216  * unicast address and is not filled with zeros.
 217  *
 218  * @param ea
 219  *   A pointer to a ether_addr structure containing the ethernet address
 220  *   to check.
 221  * @return
 222  *   True  (1) if the given ethernet address is valid;
 223  *   false (0) otherwise.
 224  */
 225 static inline int is_valid_assigned_ether_addr(const struct ether_addr *ea)
 226 {
 227         return is_unicast_ether_addr(ea) && (!is_zero_ether_addr(ea));
 228 }
 229
 230 /**
 231  * Generate a random Ethernet address that is locally administered
 232  * and not multicast.
 233  * @param addr
 234  *   A pointer to Ethernet address.
 235  */
 236 static inline void eth_random_addr(uint8_t *addr)
 237 {
 238         uint64_t rand = rte_rand();
 239         uint8_t *p = (uint8_t *)&rand;
 240
 241         rte_memcpy(addr, p, ETHER_ADDR_LEN);
 242         addr[0] &= ~ETHER_GROUP_ADDR;       /* clear multicast bit */
 243         addr[0] |= ETHER_LOCAL_ADMIN_ADDR;  /* set local assignment bit */
 244 }
 245
 246 /**
 247  * Fast copy an Ethernet address.
 248  *
 249  * @param ea_from
 250  *   A pointer to a ether_addr structure holding the Ethernet address to copy.
 251  * @param ea_to
 252  *   A pointer to a ether_addr structure where to copy the Ethernet address.
 253  */
 254 static inline void ether_addr_copy(const struct ether_addr *ea_from,
 255                                    struct ether_addr *ea_to)
 256 {
 257 #ifdef __INTEL_COMPILER
 258         uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
 259         uint16_t *to_words   = (uint16_t *)(ea_to->addr_bytes);
 260
 261         to_words[0] = from_words[0];
 262         to_words[1] = from_words[1];
 263         to_words[2] = from_words[2];
 264 #else
 265         /*
 266          * Use the common way, because of a strange gcc warning.
 267          */
 268         *ea_to = *ea_from;
 269 #endif
 270 }
 271
 272 #define ETHER_ADDR_FMT_SIZE         18
 273 /**
 274  * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
 275  *
 276  * @param buf
 277  *   A pointer to buffer contains the formatted MAC address.
 278  * @param size
 279  *   The format buffer size.
 280  * @param eth_addr
 281  *   A pointer to a ether_addr structure.
 282  */
 283 static inline void
 284 ether_format_addr(char *buf, uint16_t size,
 285                   const struct ether_addr *eth_addr)
 286 {
 287         snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
 288                  eth_addr->addr_bytes[0],
 289                  eth_addr->addr_bytes[1],
 290                  eth_addr->addr_bytes[2],
 291                  eth_addr->addr_bytes[3],
 292                  eth_addr->addr_bytes[4],
 293                  eth_addr->addr_bytes[5]);
 294 }
 295
 296 /**
 297  * Ethernet header: Contains the destination address, source address
 298  * and frame type.
 299  */
 300 struct ether_hdr {
 301         struct ether_addr d_addr; /**< Destination address. */
 302         struct ether_addr s_addr; /**< Source address. */
 303         uint16_t ether_type;      /**< Frame type. */
 304 } __attribute__((__packed__));
 305
 306 /**
 307  * Ethernet VLAN Header.
 308  * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
 309  * of the encapsulated frame.
 310  */
 311 struct vlan_hdr {
 312         uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
 313         uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
 314 } __attribute__((__packed__));
 315
 316 /**
 317  * VXLAN protocol header.
 318  * Contains the 8-bit flag, 24-bit VXLAN Network Identifier and
 319  * Reserved fields (24 bits and 8 bits)
 320  */
 321 struct vxlan_hdr {
 322         uint32_t vx_flags; /**< flag (8) + Reserved (24). */
 323         uint32_t vx_vni;   /**< VNI (24) + Reserved (8). */
 324 } __attribute__((__packed__));
 325
 326 /* Ethernet frame types */
 327 #define ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
 328 #define ETHER_TYPE_IPv6 0x86DD /**< IPv6 Protocol. */
 329 #define ETHER_TYPE_ARP  0x0806 /**< Arp Protocol. */
 330 #define ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
 331 #define ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
 332 #define ETHER_TYPE_QINQ 0x88A8 /**< IEEE 802.1ad QinQ tagging. */
 333 #define ETHER_TYPE_1588 0x88F7 /**< IEEE 802.1AS 1588 Precise Time Protocol. */
 334 #define ETHER_TYPE_SLOW 0x8809 /**< Slow protocols (LACP and Marker). */
 335 #define ETHER_TYPE_TEB  0x6558 /**< Transparent Ethernet Bridging. */
 336 #define ETHER_TYPE_LLDP 0x88CC /**< LLDP Protocol. */
 337
 338 #define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr))
 339 /**< VXLAN tunnel header length. */
 340
 341 /**
 342  * Extract VLAN tag information into mbuf
 343  *
 344  * Software version of VLAN stripping
 345  *
 346  * @param m
 347  *   The packet mbuf.
 348  * @return
 349  *   - 0: Success
 350  *   - 1: not a vlan packet
 351  */
 352 static inline int rte_vlan_strip(struct rte_mbuf *m)
 353 {
 354         struct ether_hdr *eh
 355                  = rte_pktmbuf_mtod(m, struct ether_hdr *);
 356
 357         if (eh->ether_type != rte_cpu_to_be_16(ETHER_TYPE_VLAN))
 358                 return -1;
 359
 360         struct vlan_hdr *vh = (struct vlan_hdr *)(eh + 1);
 361         m->ol_flags |= PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED;
 362         m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);
 363
 364         /* Copy ether header over rather than moving whole packet */
 365         memmove(rte_pktmbuf_adj(m, sizeof(struct vlan_hdr)),
 366                 eh, 2 * ETHER_ADDR_LEN);
 367
 368         return 0;
 369 }
 370
 371 /**
 372  * Insert VLAN tag into mbuf.
 373  *
 374  * Software version of VLAN unstripping
 375  *
 376  * @param m
 377  *   The packet mbuf.
 378  * @return
 379  *   - 0: On success
 380  *   -EPERM: mbuf is is shared overwriting would be unsafe
 381  *   -ENOSPC: not enough headroom in mbuf
 382  */
 383 static inline int rte_vlan_insert(struct rte_mbuf **m)
 384 {
 385         struct ether_hdr *oh, *nh;
 386         struct vlan_hdr *vh;
 387
 388         /* Can't insert header if mbuf is shared */
 389         if (rte_mbuf_refcnt_read(*m) > 1) {
 390                 struct rte_mbuf *copy;
 391
 392                 copy = rte_pktmbuf_clone(*m, (*m)->pool);
 393                 if (unlikely(copy == NULL))
 394                         return -ENOMEM;
 395                 rte_pktmbuf_free(*m);
 396                 *m = copy;
 397         }
 398
 399         oh = rte_pktmbuf_mtod(*m, struct ether_hdr *);
 400         nh = (struct ether_hdr *)
 401                 rte_pktmbuf_prepend(*m, sizeof(struct vlan_hdr));
 402         if (nh == NULL)
 403                 return -ENOSPC;
 404
 405         memmove(nh, oh, 2 * ETHER_ADDR_LEN);
 406         nh->ether_type = rte_cpu_to_be_16(ETHER_TYPE_VLAN);
 407
 408         vh = (struct vlan_hdr *) (nh + 1);
 409         vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
 410
 411         (*m)->ol_flags &= ~PKT_RX_VLAN_STRIPPED;
 412
 413         return 0;
 414 }
 415
 416 #ifdef __cplusplus
 417 }
 418 #endif
 419
 420 #endif /* _RTE_ETHER_H_ */