usr/src/uts/common/xen/io/xnbe.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28 /*
  29  * Xen network backend - ioemu version.
  30  *
  31  * HVM guest domains use an emulated network device (typically the
  32  * rtl8139) to access the physical network via IO emulation running in
  33  * a backend domain (generally domain 0).
  34  *
  35  * The IO emulation code sends and receives packets using DLPI, usually
  36  * through a virtual NIC (vnic).
  37  *
  38  * The creation of the relevant vnic to correspond to the network interface
  39  * in the guest domain requires the use of 'hotplug' scripts in the backend
  40  * domain. This driver ensures that the hotplug scripts are run when
  41  * such guest domains are created.
  42  *
  43  * It is used as a result of the 'compatible' property associated with
  44  * IO emulated devices. See /etc/driver_aliases and common/xen/os/xvdi.c.
  45  */
  46
  47 #ifdef DEBUG
  48 #define XNBE_DEBUG 1
  49 #endif /* DEBUG */
  50
  51 #include <sys/types.h>
  52 #include <sys/conf.h>
  53 #include <sys/sunddi.h>
  54 #include <sys/modctl.h>
  55 #include <xen/sys/xendev.h>
  56 #ifdef XNBE_DEBUG
  57 #include <sys/cmn_err.h>
  58 #endif /* XNBE_DEBUG */
  59
  60 #ifdef XNBE_DEBUG
  61 int xnbe_debug = 0;
  62 #endif /* XNBE_DEBUG */
  63
  64 static int
  65 xnbe_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
  66 {
  67 #ifdef XNBE_DEBUG
  68         if (xnbe_debug > 0)
  69                 cmn_err(CE_NOTE, "xnbe_attach: dip 0x%p, cmd %d",
  70                     (void *)dip, cmd);
  71 #endif /* XNBE_DEBUG */
  72
  73         switch (cmd) {
  74         case DDI_ATTACH:
  75                 break;
  76         case DDI_RESUME:
  77                 return (DDI_SUCCESS);
  78         default:
  79                 return (DDI_FAILURE);
  80         }
  81
  82         (void) xvdi_post_event(dip, XEN_HP_ADD);
  83
  84         return (DDI_SUCCESS);
  85 }
  86
  87 static int
  88 xnbe_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
  89 {
  90 #ifdef XNBE_DEBUG
  91         if (xnbe_debug > 0)
  92                 cmn_err(CE_NOTE, "detach: dip 0x%p, cmd %d",
  93                     (void *)dip, cmd);
  94 #endif /* XNBE_DEBUG */
  95
  96         switch (cmd) {
  97         case DDI_DETACH:
  98                 return (DDI_SUCCESS);
  99         case DDI_SUSPEND:
 100                 return (DDI_SUCCESS);
 101         default:
 102                 return (DDI_FAILURE);
 103         }
 104 }
 105
 106 static struct cb_ops cb_ops = {
 107         nulldev,                /* open */
 108         nulldev,                /* close */
 109         nodev,                  /* strategy */
 110         nodev,                  /* print */
 111         nodev,                  /* dump */
 112         nodev,                  /* read */
 113         nodev,                  /* write */
 114         nodev,                  /* ioctl */
 115         nodev,                  /* devmap */
 116         nodev,                  /* mmap */
 117         nodev,                  /* segmap */
 118         nochpoll,               /* poll */
 119         ddi_prop_op,            /* cb_prop_op */
 120         0,                      /* streamtab  */
 121         D_NEW | D_MP | D_64BIT  /* Driver compatibility flag */
 122 };
 123
 124 static struct dev_ops ops = {
 125         DEVO_REV,               /* devo_rev */
 126         0,                      /* devo_refcnt  */
 127         nulldev,                /* devo_getinfo */
 128         nulldev,                /* devo_identify */
 129         nulldev,                /* devo_probe */
 130         xnbe_attach,            /* devo_attach */
 131         xnbe_detach,            /* devo_detach */
 132         nodev,                  /* devo_reset */
 133         &cb_ops,                /* devo_cb_ops */
 134         NULL,   /* devo_bus_ops */
 135         NULL,                   /* devo_power */
 136         ddi_quiesce_not_needed,         /* devo_quiesce */
 137 };
 138
 139 static struct modldrv modldrv = {
 140         &mod_driverops, "xnbe driver", &ops,
 141 };
 142
 143 static struct modlinkage modlinkage = {
 144         MODREV_1, &modldrv, NULL
 145 };
 146
 147 int
 148 _init(void)
 149 {
 150         return (mod_install(&modlinkage));
 151 }
 152
 153 int
 154 _info(struct modinfo *modinfop)
 155 {
 156         return (mod_info(&modlinkage, modinfop));
 157 }
 158
 159 int
 160 _fini(void)
 161 {
 162         return (mod_remove(&modlinkage));
 163 }