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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2013 Red Hat, Inc.
  * Author: Daniel Borkmann <dborkman@redhat.com>
  *         Chetan Loke <loke.chetan@gmail.com> (TPACKET_V3 usage example)
  *
  * A basic test of packet socket's TPACKET_V1/TPACKET_V2/TPACKET_V3 behavior.
  *
  * Control:
  *   Test the setup of the TPACKET socket with different patterns that are
  *   known to fail (TODO) resp. succeed (OK).
  *
  * Datapath:
  *   Open a pair of packet sockets and send resp. receive an a priori known
  *   packet pattern accross the sockets and check if it was received resp.
  *   sent correctly. Fanout in combination with RX_RING is currently not
  *   tested here.
  *
  *   The test currently runs for
  *   - TPACKET_V1: RX_RING, TX_RING
  *   - TPACKET_V2: RX_RING, TX_RING
  *   - TPACKET_V3: RX_RING
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/mman.h>
 #include <linux/if_packet.h>
 #include <linux/filter.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <bits/wordsize.h>
 #include <net/ethernet.h>
 #include <netinet/ip.h>
 #include <arpa/inet.h>
 #include <stdint.h>
 #include <string.h>
 #include <assert.h>
 #include <net/if.h>
 #include <inttypes.h>
 #include <poll.h>
 
 #include "psock_lib.h"
 
 #include "../kselftest.h"
 
 #ifndef bug_on
 # define bug_on(cond)       assert(!(cond))
 #endif
 
 #ifndef __aligned_tpacket
 # define __aligned_tpacket  __attribute__((aligned(TPACKET_ALIGNMENT)))
 #endif
 
 #ifndef __align_tpacket
 # define __align_tpacket(x) __attribute__((aligned(TPACKET_ALIGN(x))))
 #endif
 
 #define NUM_PACKETS     100
 #define ALIGN_8(x)      (((x) + 8 - 1) & ~(8 - 1))
 
 struct ring {
     struct iovec *rd;
     uint8_t *mm_space;
     size_t mm_len, rd_len;
     struct sockaddr_ll ll;
     void (*walk)(int sock, struct ring *ring);
     int type, rd_num, flen, version;
     union {
         struct tpacket_req  req;
         struct tpacket_req3 req3;
     };
 };
 
 struct block_desc {
     uint32_t version;
     uint32_t offset_to_priv;
     struct tpacket_hdr_v1 h1;
 };
 
 union frame_map {
     struct {
         struct tpacket_hdr tp_h __aligned_tpacket;
         struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket_hdr));
     } *v1;
     struct {
         struct tpacket2_hdr tp_h __aligned_tpacket;
         struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket2_hdr));
     } *v2;
     void *raw;
 };
 
 static unsigned int total_packets, total_bytes;
 
 static int pfsocket(int ver)
 {
     int ret, sock = socket(PF_PACKET, SOCK_RAW, 0);
     if (sock == -1) {
         perror("socket");
         exit(1);
     }
 
     ret = setsockopt(sock, SOL_PACKET, PACKET_VERSION, &ver, sizeof(ver));
     if (ret == -1) {
         perror("setsockopt");
         exit(1);
     }
 
     return sock;
 }
 
 static void status_bar_update(void)
 {
     if (total_packets % 10 == 0) {
         fprintf(stderr, ".");
         fflush(stderr);
     }
 }
 
 static void test_payload(void *pay, size_t len)
 {
     struct ethhdr *eth = pay;
 
     if (len < sizeof(struct ethhdr)) {
         fprintf(stderr, "test_payload: packet too "
             "small: %zu bytes!\n", len);
         exit(1);
     }
 
     if (eth->h_proto != htons(ETH_P_IP)) {
         fprintf(stderr, "test_payload: wrong ethernet "
             "type: 0x%x!\n", ntohs(eth->h_proto));
         exit(1);
     }
 }
 
 static void create_payload(void *pay, size_t *len)
 {
     int i;
     struct ethhdr *eth = pay;
     struct iphdr *ip = pay + sizeof(*eth);
 
     /* Lets create some broken crap, that still passes
      * our BPF filter.
      */
 
     *len = DATA_LEN + 42;
 
     memset(pay, 0xff, ETH_ALEN * 2);
     eth->h_proto = htons(ETH_P_IP);
 
     for (i = 0; i < sizeof(*ip); ++i)
         ((uint8_t *) pay)[i + sizeof(*eth)] = (uint8_t) rand();
 
     ip->ihl = 5;
     ip->version = 4;
     ip->protocol = 0x11;
     ip->frag_off = 0;
     ip->ttl = 64;
     ip->tot_len = htons((uint16_t) *len - sizeof(*eth));
 
     ip->saddr = htonl(INADDR_LOOPBACK);
     ip->daddr = htonl(INADDR_LOOPBACK);
 
     memset(pay + sizeof(*eth) + sizeof(*ip),
            DATA_CHAR, DATA_LEN);
 }
 
 static inline int __v1_rx_kernel_ready(struct tpacket_hdr *hdr)
 {
     return ((hdr->tp_status & TP_STATUS_USER) == TP_STATUS_USER);
 }
 
 static inline void __v1_rx_user_ready(struct tpacket_hdr *hdr)
 {
     hdr->tp_status = TP_STATUS_KERNEL;
     __sync_synchronize();
 }
 
 static inline int __v2_rx_kernel_ready(struct tpacket2_hdr *hdr)
 {
     return ((hdr->tp_status & TP_STATUS_USER) == TP_STATUS_USER);
 }
 
 static inline void __v2_rx_user_ready(struct tpacket2_hdr *hdr)
 {
     hdr->tp_status = TP_STATUS_KERNEL;
     __sync_synchronize();
 }
 
 static inline int __v1_v2_rx_kernel_ready(void *base, int version)
 {
     switch (version) {
     case TPACKET_V1:
         return __v1_rx_kernel_ready(base);
     case TPACKET_V2:
         return __v2_rx_kernel_ready(base);
     default:
         bug_on(1);
         return 0;
     }
 }
 
 static inline void __v1_v2_rx_user_ready(void *base, int version)
 {
     switch (version) {
     case TPACKET_V1:
         __v1_rx_user_ready(base);
         break;
     case TPACKET_V2:
         __v2_rx_user_ready(base);
         break;
     }
 }
 
 static void walk_v1_v2_rx(int sock, struct ring *ring)
 {
     struct pollfd pfd;
     int udp_sock[2];
     union frame_map ppd;
     unsigned int frame_num = 0;
 
     bug_on(ring->type != PACKET_RX_RING);
 
     pair_udp_open(udp_sock, PORT_BASE);
 
     memset(&pfd, 0, sizeof(pfd));
     pfd.fd = sock;
     pfd.events = POLLIN | POLLERR;
     pfd.revents = 0;
 
     pair_udp_send(udp_sock, NUM_PACKETS);
 
     while (total_packets < NUM_PACKETS * 2) {
         while (__v1_v2_rx_kernel_ready(ring->rd[frame_num].iov_base,
                            ring->version)) {
             ppd.raw = ring->rd[frame_num].iov_base;
 
             switch (ring->version) {
             case TPACKET_V1:
                 test_payload((uint8_t *) ppd.raw + ppd.v1->tp_h.tp_mac,
                          ppd.v1->tp_h.tp_snaplen);
                 total_bytes += ppd.v1->tp_h.tp_snaplen;
                 break;
 
             case TPACKET_V2:
                 test_payload((uint8_t *) ppd.raw + ppd.v2->tp_h.tp_mac,
                          ppd.v2->tp_h.tp_snaplen);
                 total_bytes += ppd.v2->tp_h.tp_snaplen;
                 break;
             }
 
             status_bar_update();
             total_packets++;
 
             __v1_v2_rx_user_ready(ppd.raw, ring->version);
 
             frame_num = (frame_num + 1) % ring->rd_num;
         }
 
         poll(&pfd, 1, 1);
     }
 
     pair_udp_close(udp_sock);
 
     if (total_packets != 2 * NUM_PACKETS) {
         fprintf(stderr, "walk_v%d_rx: received %u out of %u pkts\n",
             ring->version, total_packets, NUM_PACKETS);
         exit(1);
     }
 
     fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, total_bytes >> 1);
 }
 
 static inline int __v1_tx_kernel_ready(struct tpacket_hdr *hdr)
 {
     return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
 }
 
 static inline void __v1_tx_user_ready(struct tpacket_hdr *hdr)
 {
     hdr->tp_status = TP_STATUS_SEND_REQUEST;
     __sync_synchronize();
 }
 
 static inline int __v2_tx_kernel_ready(struct tpacket2_hdr *hdr)
 {
     return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
 }
 
 static inline void __v2_tx_user_ready(struct tpacket2_hdr *hdr)
 {
     hdr->tp_status = TP_STATUS_SEND_REQUEST;
     __sync_synchronize();
 }
 
 static inline int __v3_tx_kernel_ready(struct tpacket3_hdr *hdr)
 {
     return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
 }
 
 static inline void __v3_tx_user_ready(struct tpacket3_hdr *hdr)
 {
     hdr->tp_status = TP_STATUS_SEND_REQUEST;
     __sync_synchronize();
 }
 
 static inline int __tx_kernel_ready(void *base, int version)
 {
     switch (version) {
     case TPACKET_V1:
         return __v1_tx_kernel_ready(base);
     case TPACKET_V2:
         return __v2_tx_kernel_ready(base);
     case TPACKET_V3:
         return __v3_tx_kernel_ready(base);
     default:
         bug_on(1);
         return 0;
     }
 }
 
 static inline void __tx_user_ready(void *base, int version)
 {
     switch (version) {
     case TPACKET_V1:
         __v1_tx_user_ready(base);
         break;
     case TPACKET_V2:
         __v2_tx_user_ready(base);
         break;
     case TPACKET_V3:
         __v3_tx_user_ready(base);
         break;
     }
 }
 
 static void __v1_v2_set_packet_loss_discard(int sock)
 {
     int ret, discard = 1;
 
     ret = setsockopt(sock, SOL_PACKET, PACKET_LOSS, (void *) &discard,
              sizeof(discard));
     if (ret == -1) {
         perror("setsockopt");
         exit(1);
     }
 }
 
 static inline void *get_next_frame(struct ring *ring, int n)
 {
     uint8_t *f0 = ring->rd[0].iov_base;
 
     switch (ring->version) {
     case TPACKET_V1:
     case TPACKET_V2:
         return ring->rd[n].iov_base;
     case TPACKET_V3:
         return f0 + (n * ring->req3.tp_frame_size);
     default:
         bug_on(1);
     }
 }
 
 static void walk_tx(int sock, struct ring *ring)
 {
     struct pollfd pfd;
     int rcv_sock, ret;
     size_t packet_len;
     union frame_map ppd;
     char packet[1024];
     unsigned int frame_num = 0, got = 0;
     struct sockaddr_ll ll = {
         .sll_family = PF_PACKET,
         .sll_halen = ETH_ALEN,
     };
     int nframes;
 
     /* TPACKET_V{1,2} sets up the ring->rd* related variables based
      * on frames (e.g., rd_num is tp_frame_nr) whereas V3 sets these
      * up based on blocks (e.g, rd_num is  tp_block_nr)
      */
     if (ring->version <= TPACKET_V2)
         nframes = ring->rd_num;
     else
         nframes = ring->req3.tp_frame_nr;
 
     bug_on(ring->type != PACKET_TX_RING);
     bug_on(nframes < NUM_PACKETS);
 
     rcv_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
     if (rcv_sock == -1) {
         perror("socket");
         exit(1);
     }
 
     pair_udp_setfilter(rcv_sock);
 
     ll.sll_ifindex = if_nametoindex("lo");
     ret = bind(rcv_sock, (struct sockaddr *) &ll, sizeof(ll));
     if (ret == -1) {
         perror("bind");
         exit(1);
     }
 
     memset(&pfd, 0, sizeof(pfd));
     pfd.fd = sock;
     pfd.events = POLLOUT | POLLERR;
     pfd.revents = 0;
 
     total_packets = NUM_PACKETS;
     create_payload(packet, &packet_len);
 
     while (total_packets > 0) {
         void *next = get_next_frame(ring, frame_num);
 
         while (__tx_kernel_ready(next, ring->version) &&
                total_packets > 0) {
             ppd.raw = next;
 
             switch (ring->version) {
             case TPACKET_V1:
                 ppd.v1->tp_h.tp_snaplen = packet_len;
                 ppd.v1->tp_h.tp_len = packet_len;
 
                 memcpy((uint8_t *) ppd.raw + TPACKET_HDRLEN -
                        sizeof(struct sockaddr_ll), packet,
                        packet_len);
                 total_bytes += ppd.v1->tp_h.tp_snaplen;
                 break;
 
             case TPACKET_V2:
                 ppd.v2->tp_h.tp_snaplen = packet_len;
                 ppd.v2->tp_h.tp_len = packet_len;
 
                 memcpy((uint8_t *) ppd.raw + TPACKET2_HDRLEN -
                        sizeof(struct sockaddr_ll), packet,
                        packet_len);
                 total_bytes += ppd.v2->tp_h.tp_snaplen;
                 break;
             case TPACKET_V3: {
                 struct tpacket3_hdr *tx = next;
 
                 tx->tp_snaplen = packet_len;
                 tx->tp_len = packet_len;
                 tx->tp_next_offset = 0;
 
                 memcpy((uint8_t *)tx + TPACKET3_HDRLEN -
                        sizeof(struct sockaddr_ll), packet,
                        packet_len);
                 total_bytes += tx->tp_snaplen;
                 break;
             }
             }
 
             status_bar_update();
             total_packets--;
 
             __tx_user_ready(next, ring->version);
 
             frame_num = (frame_num + 1) % nframes;
         }
 
         poll(&pfd, 1, 1);
     }
 
     bug_on(total_packets != 0);
 
     ret = sendto(sock, NULL, 0, 0, NULL, 0);
     if (ret == -1) {
         perror("sendto");
         exit(1);
     }
 
     while ((ret = recvfrom(rcv_sock, packet, sizeof(packet),
                    0, NULL, NULL)) > 0 &&
            total_packets < NUM_PACKETS) {
         got += ret;
         test_payload(packet, ret);
 
         status_bar_update();
         total_packets++;
     }
 
     close(rcv_sock);
 
     if (total_packets != NUM_PACKETS) {
         fprintf(stderr, "walk_v%d_rx: received %u out of %u pkts\n",
             ring->version, total_packets, NUM_PACKETS);
         exit(1);
     }
 
     fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, got);
 }
 
 static void walk_v1_v2(int sock, struct ring *ring)
 {
     if (ring->type == PACKET_RX_RING)
         walk_v1_v2_rx(sock, ring);
     else
         walk_tx(sock, ring);
 }
 
 static uint64_t __v3_prev_block_seq_num = 0;
 
 void __v3_test_block_seq_num(struct block_desc *pbd)
 {
     if (__v3_prev_block_seq_num + 1 != pbd->h1.seq_num) {
         fprintf(stderr, "\nprev_block_seq_num:%"PRIu64", expected "
             "seq:%"PRIu64" != actual seq:%"PRIu64"\n",
             __v3_prev_block_seq_num, __v3_prev_block_seq_num + 1,
             (uint64_t) pbd->h1.seq_num);
         exit(1);
     }
 
     __v3_prev_block_seq_num = pbd->h1.seq_num;
 }
 
 static void __v3_test_block_len(struct block_desc *pbd, uint32_t bytes, int block_num)
 {
     if (pbd->h1.num_pkts && bytes != pbd->h1.blk_len) {
         fprintf(stderr, "\nblock:%u with %upackets, expected "
             "len:%u != actual len:%u\n", block_num,
             pbd->h1.num_pkts, bytes, pbd->h1.blk_len);
         exit(1);
     }
 }
 
 static void __v3_test_block_header(struct block_desc *pbd, const int block_num)
 {
     if ((pbd->h1.block_status & TP_STATUS_USER) == 0) {
         fprintf(stderr, "\nblock %u: not in TP_STATUS_USER\n", block_num);
         exit(1);
     }
 
     __v3_test_block_seq_num(pbd);
 }
 
 static void __v3_walk_block(struct block_desc *pbd, const int block_num)
 {
     int num_pkts = pbd->h1.num_pkts, i;
     unsigned long bytes = 0, bytes_with_padding = ALIGN_8(sizeof(*pbd));
     struct tpacket3_hdr *ppd;
 
     __v3_test_block_header(pbd, block_num);
 
     ppd = (struct tpacket3_hdr *) ((uint8_t *) pbd +
                        pbd->h1.offset_to_first_pkt);
 
     for (i = 0; i < num_pkts; ++i) {
         bytes += ppd->tp_snaplen;
 
         if (ppd->tp_next_offset)
             bytes_with_padding += ppd->tp_next_offset;
         else
             bytes_with_padding += ALIGN_8(ppd->tp_snaplen + ppd->tp_mac);
 
         test_payload((uint8_t *) ppd + ppd->tp_mac, ppd->tp_snaplen);
 
         status_bar_update();
         total_packets++;
 
         ppd = (struct tpacket3_hdr *) ((uint8_t *) ppd + ppd->tp_next_offset);
         __sync_synchronize();
     }
 
     __v3_test_block_len(pbd, bytes_with_padding, block_num);
     total_bytes += bytes;
 }
 
 void __v3_flush_block(struct block_desc *pbd)
 {
     pbd->h1.block_status = TP_STATUS_KERNEL;
     __sync_synchronize();
 }
 
 static void walk_v3_rx(int sock, struct ring *ring)
 {
     unsigned int block_num = 0;
     struct pollfd pfd;
     struct block_desc *pbd;
     int udp_sock[2];
 
     bug_on(ring->type != PACKET_RX_RING);
 
     pair_udp_open(udp_sock, PORT_BASE);
 
     memset(&pfd, 0, sizeof(pfd));
     pfd.fd = sock;
     pfd.events = POLLIN | POLLERR;
     pfd.revents = 0;
 
     pair_udp_send(udp_sock, NUM_PACKETS);
 
     while (total_packets < NUM_PACKETS * 2) {
         pbd = (struct block_desc *) ring->rd[block_num].iov_base;
 
         while ((pbd->h1.block_status & TP_STATUS_USER) == 0)
             poll(&pfd, 1, 1);
 
         __v3_walk_block(pbd, block_num);
         __v3_flush_block(pbd);
 
         block_num = (block_num + 1) % ring->rd_num;
     }
 
     pair_udp_close(udp_sock);
 
     if (total_packets != 2 * NUM_PACKETS) {
         fprintf(stderr, "walk_v3_rx: received %u out of %u pkts\n",
             total_packets, NUM_PACKETS);
         exit(1);
     }
 
     fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, total_bytes >> 1);
 }
 
 static void walk_v3(int sock, struct ring *ring)
 {
     if (ring->type == PACKET_RX_RING)
         walk_v3_rx(sock, ring);
     else
         walk_tx(sock, ring);
 }
 
 static void __v1_v2_fill(struct ring *ring, unsigned int blocks)
 {
     ring->req.tp_block_size = getpagesize() << 2;
     ring->req.tp_frame_size = TPACKET_ALIGNMENT << 7;
     ring->req.tp_block_nr = blocks;
 
     ring->req.tp_frame_nr = ring->req.tp_block_size /
                 ring->req.tp_frame_size *
                 ring->req.tp_block_nr;
 
     ring->mm_len = ring->req.tp_block_size * ring->req.tp_block_nr;
     ring->walk = walk_v1_v2;
     ring->rd_num = ring->req.tp_frame_nr;
     ring->flen = ring->req.tp_frame_size;
 }
 
 static void __v3_fill(struct ring *ring, unsigned int blocks, int type)
 {
     if (type == PACKET_RX_RING) {
         ring->req3.tp_retire_blk_tov = 64;
         ring->req3.tp_sizeof_priv = 0;
         ring->req3.tp_feature_req_word = TP_FT_REQ_FILL_RXHASH;
     }
     ring->req3.tp_block_size = getpagesize() << 2;
     ring->req3.tp_frame_size = TPACKET_ALIGNMENT << 7;
     ring->req3.tp_block_nr = blocks;
 
     ring->req3.tp_frame_nr = ring->req3.tp_block_size /
                  ring->req3.tp_frame_size *
                  ring->req3.tp_block_nr;
 
     ring->mm_len = ring->req3.tp_block_size * ring->req3.tp_block_nr;
     ring->walk = walk_v3;
     ring->rd_num = ring->req3.tp_block_nr;
     ring->flen = ring->req3.tp_block_size;
 }
 
 static void setup_ring(int sock, struct ring *ring, int version, int type)
 {
     int ret = 0;
     unsigned int blocks = 256;
 
     ring->type = type;
     ring->version = version;
 
     switch (version) {
     case TPACKET_V1:
     case TPACKET_V2:
         if (type == PACKET_TX_RING)
             __v1_v2_set_packet_loss_discard(sock);
         __v1_v2_fill(ring, blocks);
         ret = setsockopt(sock, SOL_PACKET, type, &ring->req,
                  sizeof(ring->req));
         break;
 
     case TPACKET_V3:
         __v3_fill(ring, blocks, type);
         ret = setsockopt(sock, SOL_PACKET, type, &ring->req3,
                  sizeof(ring->req3));
         break;
     }
 
     if (ret == -1) {
         perror("setsockopt");
         exit(1);
     }
 
     ring->rd_len = ring->rd_num * sizeof(*ring->rd);
     ring->rd = malloc(ring->rd_len);
     if (ring->rd == NULL) {
         perror("malloc");
         exit(1);
     }
 
     total_packets = 0;
     total_bytes = 0;
 }
 
 static void mmap_ring(int sock, struct ring *ring)
 {
     int i;
 
     ring->mm_space = mmap(0, ring->mm_len, PROT_READ | PROT_WRITE,
                   MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
     if (ring->mm_space == MAP_FAILED) {
         perror("mmap");
         exit(1);
     }
 
     memset(ring->rd, 0, ring->rd_len);
     for (i = 0; i < ring->rd_num; ++i) {
         ring->rd[i].iov_base = ring->mm_space + (i * ring->flen);
         ring->rd[i].iov_len = ring->flen;
     }
 }
 
 static void bind_ring(int sock, struct ring *ring)
 {
     int ret;
 
     pair_udp_setfilter(sock);
 
     ring->ll.sll_family = PF_PACKET;
     ring->ll.sll_protocol = htons(ETH_P_ALL);
     ring->ll.sll_ifindex = if_nametoindex("lo");
     ring->ll.sll_hatype = 0;
     ring->ll.sll_pkttype = 0;
     ring->ll.sll_halen = 0;
 
     ret = bind(sock, (struct sockaddr *) &ring->ll, sizeof(ring->ll));
     if (ret == -1) {
         perror("bind");
         exit(1);
     }
 }
 
 static void walk_ring(int sock, struct ring *ring)
 {
     ring->walk(sock, ring);
 }
 
 static void unmap_ring(int sock, struct ring *ring)
 {
     munmap(ring->mm_space, ring->mm_len);
     free(ring->rd);
 }
 
 static int test_kernel_bit_width(void)
 {
     char in[512], *ptr;
     int num = 0, fd;
     ssize_t ret;
 
     fd = open("/proc/kallsyms", O_RDONLY);
     if (fd == -1) {
         perror("open");
         exit(1);
     }
 
     ret = read(fd, in, sizeof(in));
     if (ret <= 0) {
         perror("read");
         exit(1);
     }
 
     close(fd);
 
     ptr = in;
     while(!isspace(*ptr)) {
         num++;
         ptr++;
     }
 
     return num * 4;
 }
 
 static int test_user_bit_width(void)
 {
     return __WORDSIZE;
 }
 
 static const char *tpacket_str[] = {
     [TPACKET_V1] = "TPACKET_V1",
     [TPACKET_V2] = "TPACKET_V2",
     [TPACKET_V3] = "TPACKET_V3",
 };
 
 static const char *type_str[] = {
     [PACKET_RX_RING] = "PACKET_RX_RING",
     [PACKET_TX_RING] = "PACKET_TX_RING",
 };
 
 static int test_tpacket(int version, int type)
 {
     int sock;
     struct ring ring;
 
     fprintf(stderr, "test: %s with %s ", tpacket_str[version],
         type_str[type]);
     fflush(stderr);
 
     if (version == TPACKET_V1 &&
         test_kernel_bit_width() != test_user_bit_width()) {
         fprintf(stderr, "test: skip %s %s since user and kernel "
             "space have different bit width\n",
             tpacket_str[version], type_str[type]);
         return KSFT_SKIP;
     }
 
     sock = pfsocket(version);
     memset(&ring, 0, sizeof(ring));
     setup_ring(sock, &ring, version, type);
     mmap_ring(sock, &ring);
     bind_ring(sock, &ring);
     walk_ring(sock, &ring);
     unmap_ring(sock, &ring);
     close(sock);
 
     fprintf(stderr, "\n");
     return 0;
 }
 
 int main(void)
 {
     int ret = 0;
 
     ret |= test_tpacket(TPACKET_V1, PACKET_RX_RING);
     ret |= test_tpacket(TPACKET_V1, PACKET_TX_RING);
 
     ret |= test_tpacket(TPACKET_V2, PACKET_RX_RING);
     ret |= test_tpacket(TPACKET_V2, PACKET_TX_RING);
 
     ret |= test_tpacket(TPACKET_V3, PACKET_RX_RING);
     ret |= test_tpacket(TPACKET_V3, PACKET_TX_RING);
 
     if (ret)
         return 1;
 
     printf("OK. All tests passed\n");
     return 0;
 }

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