sys/contrib/rdma/krping/krping_dev.c

   1 /*
   2  * This code lifted from:
   3  *      Simple `echo' pseudo-device KLD
   4  *      Murray Stokely
   5  *      Converted to 5.X by Søren (Xride) Straarup
   6  */
   7
   8 /*
   9  * /bin/echo "server,port=9999,addr=192.168.69.142,validate" > /dev/krping
  10  * /bin/echo "client,port=9999,addr=192.168.69.142,validate" > /dev/krping
  11  */
  12
  13 #include <sys/cdefs.h>
  14 __FBSDID("$FreeBSD$");
  15
  16 #include <sys/types.h>
  17 #include <sys/systm.h>  /* uprintf */
  18 #include <sys/errno.h>
  19 #include <sys/param.h>  /* defines used in kernel.h */
  20 #include <sys/kernel.h> /* types used in module initialization */
  21 #include <sys/conf.h>   /* cdevsw struct */
  22 #include <sys/uio.h>    /* uio struct */
  23 #include <sys/malloc.h>
  24
  25 #include "krping.h"
  26
  27 #define BUFFERSIZE 512
  28
  29 /* Function prototypes */
  30 static d_open_t      krping_open;
  31 static d_close_t     krping_close;
  32 static d_read_t      krping_read;
  33 static d_write_t     krping_write;
  34
  35 /* Character device entry points */
  36 static struct cdevsw krping_cdevsw = {
  37         .d_version = D_VERSION,
  38         .d_open = krping_open,
  39         .d_close = krping_close,
  40         .d_read = krping_read,
  41         .d_write = krping_write,
  42         .d_name = "krping",
  43 };
  44
  45 typedef struct s_krping {
  46         char msg[BUFFERSIZE];
  47         int len;
  48 } krping_t;
  49
  50 /* vars */
  51 static struct cdev *krping_dev;
  52
  53 #undef MODULE_VERSION
  54 #include <sys/module.h>
  55
  56 static int
  57 krping_loader(struct module *m, int what, void *arg)
  58 {
  59         int err = 0;
  60
  61         switch (what) {
  62         case MOD_LOAD:                /* kldload */
  63                 krping_init();
  64                 krping_dev = make_dev(&krping_cdevsw, 0, UID_ROOT, GID_WHEEL,
  65                                         0600, "krping");
  66                 printf("Krping device loaded.\n");
  67                 break;
  68         case MOD_UNLOAD:
  69                 destroy_dev(krping_dev);
  70                 printf("Krping device unloaded.\n");
  71                 break;
  72         default:
  73                 err = EOPNOTSUPP;
  74                 break;
  75         }
  76         return err;
  77 }
  78
  79 static int
  80 krping_open(struct cdev *dev, int oflags, int devtype, struct thread *p)
  81 {
  82         int err = 0;
  83         return err;
  84 }
  85
  86 static int
  87 krping_close(struct cdev *dev, int fflag, int devtype, struct thread *p)
  88 {
  89         return 0;
  90 }
  91
  92 static int
  93 krping_read(struct cdev *dev, struct uio *uio, int ioflag)
  94 {
  95         struct krping_cb *cb, *cb2;
  96         int num=1;
  97         struct krping_cb_list copy_cbs;
  98
  99         uprintf("krping: %4s %10s %10s %10s %10s %10s %10s %10s %10s %10s\n",
 100                 "num", "device", "snd bytes", "snd msgs", "rcv bytes",
 101                 "rcv msgs", "wr bytes", "wr msgs", "rd bytes", "rd msgs");
 102         TAILQ_INIT(&copy_cbs);
 103
 104         mtx_lock(&krping_mutex);
 105         TAILQ_FOREACH(cb, &krping_cbs, list) {
 106                 cb2 = malloc(sizeof(*cb), M_DEVBUF, M_NOWAIT|M_ZERO);
 107                 if (!cb2)
 108                         break;
 109                 bcopy(cb, cb2, sizeof(*cb));
 110                 TAILQ_INSERT_TAIL(&copy_cbs, cb2, list);
 111         }
 112         mtx_unlock(&krping_mutex);
 113
 114         while (!TAILQ_EMPTY(&copy_cbs)) {
 115
 116                 cb = TAILQ_FIRST(&copy_cbs);
 117                 TAILQ_REMOVE(&copy_cbs, cb, list);
 118                 if (cb->pd) {
 119                         uprintf("krping: %4d %10s %10u %10u %10u %10u %10u %10u %10u %10u\n",
 120                              num++, cb->pd->device->name, cb->stats.send_bytes,
 121                              cb->stats.send_msgs, cb->stats.recv_bytes,
 122                              cb->stats.recv_msgs, cb->stats.write_bytes,
 123                              cb->stats.write_msgs,
 124                              cb->stats.read_bytes,
 125                              cb->stats.read_msgs);
 126                 } else {
 127                         uprintf("krping: %d listen\n", num++);
 128                 }
 129                 free(cb, M_DEVBUF);
 130         }
 131         return 0;
 132 }
 133
 134 static int
 135 krping_write(struct cdev *dev, struct uio *uio, int ioflag)
 136 {
 137         int err = 0;
 138         int amt;
 139         int remain = BUFFERSIZE;
 140         char *cp;
 141         krping_t *krpingmsg;
 142
 143         krpingmsg = malloc(sizeof *krpingmsg, M_DEVBUF, M_WAITOK|M_ZERO);
 144         if (!krpingmsg) {
 145                 uprintf("Could not malloc mem!\n");
 146                 return ENOMEM;
 147         }
 148
 149         cp = krpingmsg->msg;
 150         while (uio->uio_resid) {
 151                 amt = MIN(uio->uio_resid, remain);
 152                 if (amt == 0)
 153                         break;
 154
 155                 /* Copy the string in from user memory to kernel memory */
 156                 err = uiomove(cp, amt, uio);
 157                 if (err) {
 158                         uprintf("Write failed: bad address!\n");
 159                         return err;
 160                 }
 161                 cp += amt;
 162                 remain -= amt;
 163         }
 164
 165         if (uio->uio_resid != 0) {
 166                 uprintf("Message too big. max size is %d!\n", BUFFERSIZE);
 167                 return EMSGSIZE;
 168         }
 169
 170         /* null terminate and remove the \n */
 171         cp--;
 172         *cp = 0;
 173         krpingmsg->len = (unsigned long)(cp - krpingmsg->msg);
 174         uprintf("krping: write string = |%s|\n", krpingmsg->msg);
 175         err = krping_doit(krpingmsg->msg);
 176         free(krpingmsg, M_DEVBUF);
 177         return(err);
 178 }
 179
 180 DEV_MODULE(krping,krping_loader,NULL);