/*      $NetBSD: puffs_rumpglue.c,v 1.16 2016/01/26 23:12:17 pooka Exp $        */

/*
* Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
*
* Development of this software was supported by the
* Research Foundation of Helsinki University of Technology
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: puffs_rumpglue.c,v 1.16 2016/01/26 23:12:17 pooka Exp $");

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kthread.h>
#include <sys/mount.h>

#include <dev/putter/putter.h>
#include <dev/putter/putter_sys.h>

#include <rump-sys/vfs.h>

#include <rump/rump.h>
#include <rump/rumpuser.h>

void putterattach(void); /* XXX: from autoconf */
dev_type_open(puttercdopen);

struct ptargs {
       int comfd;
       int fpfd;
       struct filedesc *fdp;
};

#define BUFSIZE (64*1024)
extern int hz;

/*
* Read requests from /dev/puffs and forward them to comfd
*
* XXX: the init detection is really sucky, but let's not
* waste too much energy for a better one here
*/
static void
readthread(void *arg)
{
       struct ptargs *pap = arg;
       struct file *fp;
       register_t rv;
       char *buf;
       off_t off;
       int error, inited;

       buf = kmem_alloc(BUFSIZE, KM_SLEEP);
       inited = 0;

retry:
       kpause(NULL, 0, hz/4, NULL);

       for (;;) {
               size_t n;

               off = 0;
               fp = fd_getfile(pap->fpfd);
               if (fp == NULL)
                       error = EINVAL;
               else
                       error = dofileread(pap->fpfd, fp, buf, BUFSIZE,
                           &off, 0, &rv);
               if (error) {
                       if (error == ENOENT && inited == 0)
                               goto retry;
                       if (error == ENXIO)
                               break;
                       panic("fileread failed: %d", error);
               }
               inited = 1;

               while (rv) {
                       struct rumpuser_iovec iov;

                       iov.iov_base = buf;
                       iov.iov_len = rv;

                       error = rumpuser_iovwrite(pap->comfd, &iov, 1,
                           RUMPUSER_IOV_NOSEEK, &n);
                       if (error)
                               panic("fileread failed: %d", error);
                       if (n == 0)
                               panic("fileread failed: closed");
                       rv -= n;
               }
       }

       kthread_exit(0);
}

/* Read requests from comfd and proxy them to /dev/puffs */
static void
writethread(void *arg)
{
       struct ptargs *pap = arg;
       struct file *fp;
       struct putter_hdr *phdr;
       register_t rv;
       char *buf;
       off_t off;
       size_t toread;
       int error;

       buf = kmem_alloc(BUFSIZE, KM_SLEEP);
       phdr = (struct putter_hdr *)buf;

       for (;;) {
               size_t n;

               /*
                * Need to write everything to the "kernel" in one chunk,
                * so make sure we have it here.
                */
               off = 0;
               toread = sizeof(struct putter_hdr);
               do {
                       struct rumpuser_iovec iov;

                       iov.iov_base = buf+off;
                       iov.iov_len = toread;
                       error = rumpuser_iovread(pap->comfd, &iov, 1,
                           RUMPUSER_IOV_NOSEEK, &n);
                       if (error)
                               panic("rumpuser_read %zd %d", n, error);
                       if (n == 0)
                               goto out;
                       off += n;
                       if (off >= sizeof(struct putter_hdr))
                               toread = phdr->pth_framelen - off;
                       else
                               toread = off - sizeof(struct putter_hdr);
               } while (toread);

               off = 0;
               rv = 0;
               fp = fd_getfile(pap->fpfd);
               if (fp == NULL)
                       error = EINVAL;
               else
                       error = dofilewrite(pap->fpfd, fp, buf,
                           phdr->pth_framelen, &off, 0, &rv);
               if (error == ENXIO)
                       goto out;
               KASSERT(rv == phdr->pth_framelen);
       }
out:

       kthread_exit(0);
}

int
rump_syspuffs_glueinit(int fd, int *newfd)
{
       struct ptargs *pap;
       int rv;

       if ((rv = rump_init()) != 0)
               return rv;

       putterattach();
       rv = puttercdopen(makedev(178, 0), 0, 0, curlwp);
       if (rv && rv != EMOVEFD)
               return rv;

       pap = kmem_alloc(sizeof(struct ptargs), KM_SLEEP);
       pap->comfd = fd;
       pap->fpfd = curlwp->l_dupfd;
       pap->fdp = curlwp->l_proc->p_fd;

       rv = kthread_create(PRI_NONE, 0, NULL, readthread, pap, NULL,
           "rputter");
       if (rv)
               return rv;

       rv = kthread_create(PRI_NONE, 0, NULL, writethread, pap, NULL,
           "wputter");
       if (rv)
               return rv;

       *newfd = curlwp->l_dupfd;
       return 0;
}

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