/*- * Copyright (c) 1997, 1998, 1999, 2000 * Bill Paul . All rights reserved. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Bill Paul. * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD * 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 __FBSDID("$FreeBSD$"); /* * Callbacks in the USB code operate at splusb() (actually splbio() * in FreeBSD). However adding packets to the input queues has to be * done at splimp(). It is conceivable that this arrangement could * trigger a condition where the splimp() is ignored and the input * queues could get trampled in spite of our best effors to prevent * it. To work around this, we implement a special input queue for * USB ethernet adapter drivers. Rather than passing the frames directly * to ether_input(), we pass them here, then schedule a soft interrupt * to hand them to ether_input() later, outside of the USB interrupt * context. * * It's questional as to whether this code should be expanded to * handle other kinds of devices, or handle USB transfer callbacks * in general. Right now, I need USB network interfaces to work * properly. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct ifqueue usbq_rx; static struct ifqueue usbq_tx; static int mtx_inited = 0; static void usbintr (void); static void usbintr(void) { struct mbuf *m; struct usb_qdat *q; struct ifnet *ifp; /* Check the RX queue */ while(1) { IF_DEQUEUE(&usbq_rx, m); if (m == NULL) break; q = (struct usb_qdat *)m->m_pkthdr.rcvif; ifp = q->ifp; m->m_pkthdr.rcvif = ifp; (*ifp->if_input)(ifp, m); /* Re-arm the receiver */ (*q->if_rxstart)(ifp); if (ifp->if_snd.ifq_head != NULL) (*ifp->if_start)(ifp); } /* Check the TX queue */ while(1) { IF_DEQUEUE(&usbq_tx, m); if (m == NULL) break; ifp = m->m_pkthdr.rcvif; m_freem(m); if (ifp->if_snd.ifq_head != NULL) (*ifp->if_start)(ifp); } return; } void usb_register_netisr(void) { if (mtx_inited) return; netisr_register(NETISR_USB, (netisr_t *)usbintr, NULL, 0); mtx_init(&usbq_tx.ifq_mtx, "usbq_tx_mtx", NULL, MTX_DEF); mtx_init(&usbq_rx.ifq_mtx, "usbq_rx_mtx", NULL, MTX_DEF); mtx_inited++; return; } /* * Must be called at splusb() (actually splbio()). This should be * the case when called from a transfer callback routine. */ void usb_ether_input(m) struct mbuf *m; { IF_ENQUEUE(&usbq_rx, m); schednetisr(NETISR_USB); return; } void usb_tx_done(m) struct mbuf *m; { IF_ENQUEUE(&usbq_tx, m); schednetisr(NETISR_USB); return; } struct mbuf * usb_ether_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 usb_ether_rx_list_init(void *sc, struct ue_cdata *cd, usbd_device_handle ue_udev) { struct ue_chain *c; int i; for (i = 0; i < UE_RX_LIST_CNT; i++) { c = &cd->ue_rx_chain[i]; c->ue_sc = sc; c->ue_idx = i; c->ue_mbuf = usb_ether_newbuf(); if (c->ue_mbuf == NULL) return (ENOBUFS); if (c->ue_xfer == NULL) { c->ue_xfer = usbd_alloc_xfer(ue_udev); if (c->ue_xfer == NULL) return (ENOBUFS); c->ue_buf = usbd_alloc_buffer(c->ue_xfer, UE_BUFSZ); if (c->ue_buf == NULL) return (ENOBUFS); } } return (0); } int usb_ether_tx_list_init(void *sc, struct ue_cdata *cd, usbd_device_handle ue_udev) { struct ue_chain *c; int i; for (i = 0; i < UE_TX_LIST_CNT; i++) { c = &cd->ue_tx_chain[i]; c->ue_sc = sc; c->ue_idx = i; c->ue_mbuf = NULL; if (c->ue_xfer == NULL) { c->ue_xfer = usbd_alloc_xfer(ue_udev); if (c->ue_xfer == NULL) return (ENOBUFS); c->ue_buf = usbd_alloc_buffer(c->ue_xfer, UE_BUFSZ); if (c->ue_buf == NULL) return (ENOBUFS); } } return (0); } void usb_ether_rx_list_free(struct ue_cdata *cd) { int i; for (i = 0; i < UE_RX_LIST_CNT; i++) { if (cd->ue_rx_chain[i].ue_mbuf != NULL) { m_freem(cd->ue_rx_chain[i].ue_mbuf); cd->ue_rx_chain[i].ue_mbuf = NULL; } if (cd->ue_rx_chain[i].ue_xfer != NULL) { usbd_free_xfer(cd->ue_rx_chain[i].ue_xfer); cd->ue_rx_chain[i].ue_xfer = NULL; } } } void usb_ether_tx_list_free(struct ue_cdata *cd) { int i; for (i = 0; i < UE_RX_LIST_CNT; i++) { if (cd->ue_tx_chain[i].ue_mbuf != NULL) { m_freem(cd->ue_tx_chain[i].ue_mbuf); cd->ue_tx_chain[i].ue_mbuf = NULL; } if (cd->ue_tx_chain[i].ue_xfer != NULL) { usbd_free_xfer(cd->ue_tx_chain[i].ue_xfer); cd->ue_tx_chain[i].ue_xfer = NULL; } } } void usb_ether_task_init(device_t dev, int flags, struct usb_taskqueue *tq) { /* nothing for now. */ } void usb_ether_task_enqueue(struct usb_taskqueue *tq, struct task *task) { taskqueue_enqueue(taskqueue_thread, task); } void usb_ether_task_drain(struct usb_taskqueue *tq, struct task *task) { taskqueue_drain(taskqueue_thread, task); } void usb_ether_task_destroy(struct usb_taskqueue *tq) { /* nothing for now */ }