Attachment 851413 Details for Bug 1054537 – Simple program to cause this kernel issue

Simple program to cause this kernel issue

test.c (text/plain), 2.84 KB, created by Karl Auerbach on 2014-01-17 06:52:06 UTC

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Creator: Karl Auerbach

Created: 2014-01-17 06:52:06 UTC

Size: 2.84 KB

patch

obsolete

>#include <assert.h>
>#include <errno.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <stdarg.h>
>#include <unistd.h>
>
>#include <arpa/inet.h>
>#include <sys/ioctl.h>
>#include <sys/mman.h>
>#include <sys/socket.h>
>#include <sys/un.h>
>#include <sys/user.h>
>
>#include <features.h>    /* for the glibc version number */
>#include <net/ethernet.h>
>#include <linux/if_packet.h>
>#include <linux/if_ether.h>
>
>#include <net/if.h>
>#include <netinet/in.h>
>#include <sys/ioctl.h>
>#include <sys/types.h>
>#include <linux/if_tun.h>
>
>#define NIL   0
>
>typedef int SOCKET;
>
>int main(int argc, char *argv)
>{
>size_t              RxMmap_Size;
>size_t              TxMmap_Size;
>unsigned int        Ether_Sz;
>unsigned int        Block_Sz_Order;
>unsigned int        Block_Sz;
>unsigned int        Block_Cnt;
>unsigned int        Frame_Sz;
>unsigned int        Frame_Cnt;
>unsigned int        Frames_Per_Block;
>
>void *              Mmap_Addr;
>size_t              Mmap_Size;
>size_t		    TXDataOffset;
>
>SOCKET              Socket;
>
>struct tpacket_req ring_req;
>
>Ether_Sz = 1518;
>Block_Sz = Ether_Sz;
>Block_Sz_Order = 2; // 16384 byte blocks 
>Block_Cnt = 1000;
>
>Socket = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
>if (Socket == -1)
>  {
>  perror("socket failed");
>  return 1;
>  }
>
>Frame_Sz = TPACKET_ALIGN(TPACKET_ALIGN(TPACKET2_HDRLEN) + Ether_Sz);
>TXDataOffset = TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
>
>Block_Sz = getpagesize() << Block_Sz_Order;
>
>Frames_Per_Block = Block_Sz / Frame_Sz;
>Frame_Cnt = Frames_Per_Block * Block_Cnt;
>
>RxMmap_Size = Block_Sz * Block_Cnt;
>TxMmap_Size = RxMmap_Size;
>
>Mmap_Size = RxMmap_Size + TxMmap_Size;
>
>// Establish receive ring
>// For convenience we will let it be the same size as the TX ring
>// The mmap size calculations, far above, assume that the
>// rings are the same size.
>ring_req.tp_block_nr = Block_Cnt;
>ring_req.tp_frame_size = Frame_Sz;
>ring_req.tp_block_size = Block_Sz;
>ring_req.tp_frame_nr = Frame_Cnt;
>if (setsockopt(Socket, SOL_PACKET, PACKET_RX_RING,
>               (char *)&ring_req, sizeof(ring_req)) < 0)
>  {
>  perror("Setsockopt RX_RING failed");
>  close(Socket);
>  return -1;
>  }
>
>// Establish transmit ring
>// For convenience we will let it be the same size as the RX ring
>// The mmap size calculations, far above, assume that the
>// rings are the same size.
>ring_req.tp_block_nr = Block_Cnt;
>ring_req.tp_frame_size = Frame_Sz;
>ring_req.tp_block_size = Block_Sz;
>ring_req.tp_frame_nr = Frame_Cnt;
>if (setsockopt(Socket, SOL_PACKET, PACKET_TX_RING,
>               (char *)&ring_req, sizeof(ring_req)) < 0)
>  {
>  perror("Setsockopt TX_RING failed");
>  close(Socket);
>  return -1;
>  }
>
>Mmap_Addr = mmap(NIL, Mmap_Size, PROT_READ | PROT_WRITE,
>                 MAP_SHARED | MAP_LOCKED, Socket, 0);
>
>if (Mmap_Addr == MAP_FAILED)
>  {
>  perror("mmap failed");
>  return 1;
>  }
>
>if (Mmap_Addr != MAP_FAILED)
>  {
>  (void)munmap(Mmap_Addr, Mmap_Size);
>  }
>
>close(Socket);
>return 0;
>}

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Attachments on bug 1054537: 851372 | 851413