freebsd-dev/sys/dev/usb/net/usb_ethernet.c
2012-01-07 09:41:57 +00:00

641 lines
14 KiB
C

/* $FreeBSD$ */
/*-
* Copyright (c) 2009 Andrew Thompson (thompsa@FreeBSD.org)
*
* 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 AND CONTRIBUTORS ``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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/if_vlan_var.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/net/usb_ethernet.h>
static SYSCTL_NODE(_net, OID_AUTO, ue, CTLFLAG_RD, 0,
"USB Ethernet parameters");
#define UE_LOCK(_ue) mtx_lock((_ue)->ue_mtx)
#define UE_UNLOCK(_ue) mtx_unlock((_ue)->ue_mtx)
#define UE_LOCK_ASSERT(_ue, t) mtx_assert((_ue)->ue_mtx, t)
MODULE_DEPEND(uether, usb, 1, 1, 1);
MODULE_DEPEND(uether, miibus, 1, 1, 1);
static struct unrhdr *ueunit;
static usb_proc_callback_t ue_attach_post_task;
static usb_proc_callback_t ue_promisc_task;
static usb_proc_callback_t ue_setmulti_task;
static usb_proc_callback_t ue_ifmedia_task;
static usb_proc_callback_t ue_tick_task;
static usb_proc_callback_t ue_start_task;
static usb_proc_callback_t ue_stop_task;
static void ue_init(void *);
static void ue_start(struct ifnet *);
static int ue_ifmedia_upd(struct ifnet *);
static void ue_watchdog(void *);
/*
* Return values:
* 0: success
* Else: device has been detached
*/
uint8_t
uether_pause(struct usb_ether *ue, unsigned int _ticks)
{
if (usb_proc_is_gone(&ue->ue_tq)) {
/* nothing to do */
return (1);
}
usb_pause_mtx(ue->ue_mtx, _ticks);
return (0);
}
static void
ue_queue_command(struct usb_ether *ue,
usb_proc_callback_t *fn,
struct usb_proc_msg *t0, struct usb_proc_msg *t1)
{
struct usb_ether_cfg_task *task;
UE_LOCK_ASSERT(ue, MA_OWNED);
if (usb_proc_is_gone(&ue->ue_tq)) {
return; /* nothing to do */
}
/*
* NOTE: The task cannot get executed before we drop the
* "sc_mtx" mutex. It is safe to update fields in the message
* structure after that the message got queued.
*/
task = (struct usb_ether_cfg_task *)
usb_proc_msignal(&ue->ue_tq, t0, t1);
/* Setup callback and self pointers */
task->hdr.pm_callback = fn;
task->ue = ue;
/*
* Start and stop must be synchronous!
*/
if ((fn == ue_start_task) || (fn == ue_stop_task))
usb_proc_mwait(&ue->ue_tq, t0, t1);
}
struct ifnet *
uether_getifp(struct usb_ether *ue)
{
return (ue->ue_ifp);
}
struct mii_data *
uether_getmii(struct usb_ether *ue)
{
return (device_get_softc(ue->ue_miibus));
}
void *
uether_getsc(struct usb_ether *ue)
{
return (ue->ue_sc);
}
static int
ue_sysctl_parent(SYSCTL_HANDLER_ARGS)
{
struct usb_ether *ue = arg1;
const char *name;
name = device_get_nameunit(ue->ue_dev);
return SYSCTL_OUT(req, name, strlen(name));
}
int
uether_ifattach(struct usb_ether *ue)
{
int error;
/* check some critical parameters */
if ((ue->ue_dev == NULL) ||
(ue->ue_udev == NULL) ||
(ue->ue_mtx == NULL) ||
(ue->ue_methods == NULL))
return (EINVAL);
error = usb_proc_create(&ue->ue_tq, ue->ue_mtx,
device_get_nameunit(ue->ue_dev), USB_PRI_MED);
if (error) {
device_printf(ue->ue_dev, "could not setup taskqueue\n");
goto error;
}
/* fork rest of the attach code */
UE_LOCK(ue);
ue_queue_command(ue, ue_attach_post_task,
&ue->ue_sync_task[0].hdr,
&ue->ue_sync_task[1].hdr);
UE_UNLOCK(ue);
error:
return (error);
}
static void
ue_attach_post_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
struct ifnet *ifp;
int error;
char num[14]; /* sufficient for 32 bits */
/* first call driver's post attach routine */
ue->ue_methods->ue_attach_post(ue);
UE_UNLOCK(ue);
ue->ue_unit = alloc_unr(ueunit);
usb_callout_init_mtx(&ue->ue_watchdog, ue->ue_mtx, 0);
sysctl_ctx_init(&ue->ue_sysctl_ctx);
error = 0;
ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
device_printf(ue->ue_dev, "could not allocate ifnet\n");
goto fail;
}
ifp->if_softc = ue;
if_initname(ifp, "ue", ue->ue_unit);
if (ue->ue_methods->ue_attach_post_sub != NULL) {
ue->ue_ifp = ifp;
error = ue->ue_methods->ue_attach_post_sub(ue);
} else {
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
if (ue->ue_methods->ue_ioctl != NULL)
ifp->if_ioctl = ue->ue_methods->ue_ioctl;
else
ifp->if_ioctl = uether_ioctl;
ifp->if_start = ue_start;
ifp->if_init = ue_init;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
IFQ_SET_READY(&ifp->if_snd);
ue->ue_ifp = ifp;
if (ue->ue_methods->ue_mii_upd != NULL &&
ue->ue_methods->ue_mii_sts != NULL) {
/* device_xxx() depends on this */
mtx_lock(&Giant);
error = mii_attach(ue->ue_dev, &ue->ue_miibus, ifp,
ue_ifmedia_upd, ue->ue_methods->ue_mii_sts,
BMSR_DEFCAPMASK, MII_PHY_ANY, MII_OFFSET_ANY, 0);
mtx_unlock(&Giant);
}
}
if (error) {
device_printf(ue->ue_dev, "attaching PHYs failed\n");
goto fail;
}
if_printf(ifp, "<USB Ethernet> on %s\n", device_get_nameunit(ue->ue_dev));
ether_ifattach(ifp, ue->ue_eaddr);
/* Tell upper layer we support VLAN oversized frames. */
if (ifp->if_capabilities & IFCAP_VLAN_MTU)
ifp->if_hdrlen = sizeof(struct ether_vlan_header);
snprintf(num, sizeof(num), "%u", ue->ue_unit);
ue->ue_sysctl_oid = SYSCTL_ADD_NODE(&ue->ue_sysctl_ctx,
&SYSCTL_NODE_CHILDREN(_net, ue),
OID_AUTO, num, CTLFLAG_RD, NULL, "");
SYSCTL_ADD_PROC(&ue->ue_sysctl_ctx,
SYSCTL_CHILDREN(ue->ue_sysctl_oid), OID_AUTO,
"%parent", CTLTYPE_STRING | CTLFLAG_RD, ue, 0,
ue_sysctl_parent, "A", "parent device");
UE_LOCK(ue);
return;
fail:
free_unr(ueunit, ue->ue_unit);
if (ue->ue_ifp != NULL) {
if_free(ue->ue_ifp);
ue->ue_ifp = NULL;
}
UE_LOCK(ue);
return;
}
void
uether_ifdetach(struct usb_ether *ue)
{
struct ifnet *ifp;
/* wait for any post attach or other command to complete */
usb_proc_drain(&ue->ue_tq);
/* read "ifnet" pointer after taskqueue drain */
ifp = ue->ue_ifp;
if (ifp != NULL) {
/* we are not running any more */
UE_LOCK(ue);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
UE_UNLOCK(ue);
/* drain any callouts */
usb_callout_drain(&ue->ue_watchdog);
/* detach miibus */
if (ue->ue_miibus != NULL) {
mtx_lock(&Giant); /* device_xxx() depends on this */
device_delete_child(ue->ue_dev, ue->ue_miibus);
mtx_unlock(&Giant);
}
/* detach ethernet */
ether_ifdetach(ifp);
/* free interface instance */
if_free(ifp);
/* free sysctl */
sysctl_ctx_free(&ue->ue_sysctl_ctx);
/* free unit */
free_unr(ueunit, ue->ue_unit);
}
/* free taskqueue, if any */
usb_proc_free(&ue->ue_tq);
}
uint8_t
uether_is_gone(struct usb_ether *ue)
{
return (usb_proc_is_gone(&ue->ue_tq));
}
void
uether_init(void *arg)
{
ue_init(arg);
}
static void
ue_init(void *arg)
{
struct usb_ether *ue = arg;
UE_LOCK(ue);
ue_queue_command(ue, ue_start_task,
&ue->ue_sync_task[0].hdr,
&ue->ue_sync_task[1].hdr);
UE_UNLOCK(ue);
}
static void
ue_start_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
struct ifnet *ifp = ue->ue_ifp;
UE_LOCK_ASSERT(ue, MA_OWNED);
ue->ue_methods->ue_init(ue);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
if (ue->ue_methods->ue_tick != NULL)
usb_callout_reset(&ue->ue_watchdog, hz, ue_watchdog, ue);
}
static void
ue_stop_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
UE_LOCK_ASSERT(ue, MA_OWNED);
usb_callout_stop(&ue->ue_watchdog);
ue->ue_methods->ue_stop(ue);
}
void
uether_start(struct ifnet *ifp)
{
ue_start(ifp);
}
static void
ue_start(struct ifnet *ifp)
{
struct usb_ether *ue = ifp->if_softc;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
UE_LOCK(ue);
ue->ue_methods->ue_start(ue);
UE_UNLOCK(ue);
}
static void
ue_promisc_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
ue->ue_methods->ue_setpromisc(ue);
}
static void
ue_setmulti_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
ue->ue_methods->ue_setmulti(ue);
}
int
uether_ifmedia_upd(struct ifnet *ifp)
{
return (ue_ifmedia_upd(ifp));
}
static int
ue_ifmedia_upd(struct ifnet *ifp)
{
struct usb_ether *ue = ifp->if_softc;
/* Defer to process context */
UE_LOCK(ue);
ue_queue_command(ue, ue_ifmedia_task,
&ue->ue_media_task[0].hdr,
&ue->ue_media_task[1].hdr);
UE_UNLOCK(ue);
return (0);
}
static void
ue_ifmedia_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
struct ifnet *ifp = ue->ue_ifp;
ue->ue_methods->ue_mii_upd(ifp);
}
static void
ue_watchdog(void *arg)
{
struct usb_ether *ue = arg;
struct ifnet *ifp = ue->ue_ifp;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
ue_queue_command(ue, ue_tick_task,
&ue->ue_tick_task[0].hdr,
&ue->ue_tick_task[1].hdr);
usb_callout_reset(&ue->ue_watchdog, hz, ue_watchdog, ue);
}
static void
ue_tick_task(struct usb_proc_msg *_task)
{
struct usb_ether_cfg_task *task =
(struct usb_ether_cfg_task *)_task;
struct usb_ether *ue = task->ue;
struct ifnet *ifp = ue->ue_ifp;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
ue->ue_methods->ue_tick(ue);
}
int
uether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct usb_ether *ue = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct mii_data *mii;
int error = 0;
switch (command) {
case SIOCSIFFLAGS:
UE_LOCK(ue);
if (ifp->if_flags & IFF_UP) {
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
ue_queue_command(ue, ue_promisc_task,
&ue->ue_promisc_task[0].hdr,
&ue->ue_promisc_task[1].hdr);
else
ue_queue_command(ue, ue_start_task,
&ue->ue_sync_task[0].hdr,
&ue->ue_sync_task[1].hdr);
} else {
ue_queue_command(ue, ue_stop_task,
&ue->ue_sync_task[0].hdr,
&ue->ue_sync_task[1].hdr);
}
UE_UNLOCK(ue);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
UE_LOCK(ue);
ue_queue_command(ue, ue_setmulti_task,
&ue->ue_multi_task[0].hdr,
&ue->ue_multi_task[1].hdr);
UE_UNLOCK(ue);
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
if (ue->ue_miibus != NULL) {
mii = device_get_softc(ue->ue_miibus);
error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
} else
error = ether_ioctl(ifp, command, data);
break;
default:
error = ether_ioctl(ifp, command, data);
break;
}
return (error);
}
static int
uether_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
ueunit = new_unrhdr(0, INT_MAX, NULL);
break;
case MOD_UNLOAD:
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t uether_mod = {
"uether",
uether_modevent,
0
};
struct mbuf *
uether_newbuf(void)
{
struct mbuf *m_new;
m_new = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m_new == NULL)
return (NULL);
m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
m_adj(m_new, ETHER_ALIGN);
return (m_new);
}
int
uether_rxmbuf(struct usb_ether *ue, struct mbuf *m,
unsigned int len)
{
struct ifnet *ifp = ue->ue_ifp;
UE_LOCK_ASSERT(ue, MA_OWNED);
/* finalize mbuf */
ifp->if_ipackets++;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
/* enqueue for later when the lock can be released */
_IF_ENQUEUE(&ue->ue_rxq, m);
return (0);
}
int
uether_rxbuf(struct usb_ether *ue, struct usb_page_cache *pc,
unsigned int offset, unsigned int len)
{
struct ifnet *ifp = ue->ue_ifp;
struct mbuf *m;
UE_LOCK_ASSERT(ue, MA_OWNED);
if (len < ETHER_HDR_LEN || len > MCLBYTES - ETHER_ALIGN)
return (1);
m = uether_newbuf();
if (m == NULL) {
ifp->if_iqdrops++;
return (ENOMEM);
}
usbd_copy_out(pc, offset, mtod(m, uint8_t *), len);
/* finalize mbuf */
ifp->if_ipackets++;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
/* enqueue for later when the lock can be released */
_IF_ENQUEUE(&ue->ue_rxq, m);
return (0);
}
void
uether_rxflush(struct usb_ether *ue)
{
struct ifnet *ifp = ue->ue_ifp;
struct mbuf *m;
UE_LOCK_ASSERT(ue, MA_OWNED);
for (;;) {
_IF_DEQUEUE(&ue->ue_rxq, m);
if (m == NULL)
break;
/*
* The USB xfer has been resubmitted so its safe to unlock now.
*/
UE_UNLOCK(ue);
ifp->if_input(ifp, m);
UE_LOCK(ue);
}
}
DECLARE_MODULE(uether, uether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(uether, 1);