1cafed3941
drain routines are done by swi_net, which allows for better queue control at some future point. Packets may also be directly dispatched to a netisr instead of queued, this may be of interest at some installations, but currently defaults to off. Reviewed by: hsu, silby, jayanth, sam Sponsored by: DARPA, NAI Labs
149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/*
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* Copyright (c) 1997, 1998, 1999, 2000
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* Bill Paul <wpaul@ee.columbia.edu>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bill Paul.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Callbacks in the USB code operate at splusb() (actually splbio()
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* in FreeBSD). However adding packets to the input queues has to be
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* done at splimp(). It is conceivable that this arrangement could
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* trigger a condition where the splimp() is ignored and the input
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* queues could get trampled in spite of our best effors to prevent
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* it. To work around this, we implement a special input queue for
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* USB ethernet adapter drivers. Rather than passing the frames directly
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* to ether_input(), we pass them here, then schedule a soft interrupt
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* to hand them to ether_input() later, outside of the USB interrupt
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* context.
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*
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* It's questional as to whether this code should be expanded to
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* handle other kinds of devices, or handle USB transfer callbacks
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* in general. Right now, I need USB network interfaces to work
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* properly.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/netisr.h>
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#include <net/bpf.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usb_ethersubr.h>
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#ifndef lint
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Static const char rcsid[] =
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"$FreeBSD$";
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#endif
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Static struct ifqueue usbq_rx;
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Static struct ifqueue usbq_tx;
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Static int mtx_inited = 0;
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Static void usbintr (void);
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Static void usbintr(void)
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{
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struct mbuf *m;
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struct usb_qdat *q;
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struct ifnet *ifp;
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/* Check the RX queue */
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while(1) {
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IF_DEQUEUE(&usbq_rx, m);
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if (m == NULL)
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break;
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q = (struct usb_qdat *)m->m_pkthdr.rcvif;
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ifp = q->ifp;
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m->m_pkthdr.rcvif = ifp;
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(*ifp->if_input)(ifp, m);
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/* Re-arm the receiver */
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(*q->if_rxstart)(ifp);
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if (ifp->if_snd.ifq_head != NULL)
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(*ifp->if_start)(ifp);
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}
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/* Check the TX queue */
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while(1) {
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IF_DEQUEUE(&usbq_tx, m);
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if (m == NULL)
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break;
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ifp = m->m_pkthdr.rcvif;
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m_freem(m);
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if (ifp->if_snd.ifq_head != NULL)
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(*ifp->if_start)(ifp);
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}
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return;
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}
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void usb_register_netisr()
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{
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if (mtx_inited)
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return;
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netisr_register(NETISR_USB, (netisr_t *)usbintr, NULL);
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mtx_init(&usbq_tx.ifq_mtx, "usbq_tx_mtx", NULL, MTX_DEF);
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mtx_init(&usbq_rx.ifq_mtx, "usbq_rx_mtx", NULL, MTX_DEF);
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mtx_inited++;
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return;
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}
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/*
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* Must be called at splusb() (actually splbio()). This should be
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* the case when called from a transfer callback routine.
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*/
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void usb_ether_input(m)
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struct mbuf *m;
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{
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IF_ENQUEUE(&usbq_rx, m);
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schednetisr(NETISR_USB);
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return;
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}
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void usb_tx_done(m)
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struct mbuf *m;
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{
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IF_ENQUEUE(&usbq_tx, m);
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schednetisr(NETISR_USB);
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return;
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}
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