1594 lines
37 KiB
C
1594 lines
37 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (C) 2013-2014 Universita` di Pisa. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/module.h>
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#include <sys/errno.h>
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#include <sys/eventhandler.h>
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#include <sys/jail.h>
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#include <sys/poll.h> /* POLLIN, POLLOUT */
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#include <sys/kernel.h> /* types used in module initialization */
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#include <sys/conf.h> /* DEV_MODULE_ORDERED */
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#include <sys/endian.h>
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#include <sys/syscallsubr.h> /* kern_ioctl() */
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#include <sys/rwlock.h>
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#include <vm/vm.h> /* vtophys */
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#include <vm/pmap.h> /* vtophys */
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/uma.h>
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#include <sys/malloc.h>
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#include <sys/socket.h> /* sockaddrs */
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#include <sys/selinfo.h>
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#include <sys/kthread.h> /* kthread_add() */
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#include <sys/proc.h> /* PROC_LOCK() */
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#include <sys/unistd.h> /* RFNOWAIT */
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#include <sys/sched.h> /* sched_bind() */
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#include <sys/smp.h> /* mp_maxid */
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#include <sys/taskqueue.h> /* taskqueue_enqueue(), taskqueue_create(), ... */
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h> /* IFT_ETHER */
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#include <net/ethernet.h> /* ether_ifdetach */
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#include <net/if_dl.h> /* LLADDR */
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#include <machine/bus.h> /* bus_dmamap_* */
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#include <netinet/in.h> /* in6_cksum_pseudo() */
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#include <machine/in_cksum.h> /* in_pseudo(), in_cksum_hdr() */
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#include <net/netmap.h>
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#include <dev/netmap/netmap_kern.h>
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#include <net/netmap_virt.h>
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#include <dev/netmap/netmap_mem2.h>
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/* ======================== FREEBSD-SPECIFIC ROUTINES ================== */
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static void
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nm_kqueue_notify(void *opaque, int pending)
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{
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struct nm_selinfo *si = opaque;
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/* We use a non-zero hint to distinguish this notification call
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* from the call done in kqueue_scan(), which uses hint=0.
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*/
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KNOTE_UNLOCKED(&si->si.si_note, /*hint=*/0x100);
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}
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int nm_os_selinfo_init(NM_SELINFO_T *si, const char *name) {
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int err;
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TASK_INIT(&si->ntfytask, 0, nm_kqueue_notify, si);
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si->ntfytq = taskqueue_create(name, M_NOWAIT,
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taskqueue_thread_enqueue, &si->ntfytq);
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if (si->ntfytq == NULL)
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return -ENOMEM;
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err = taskqueue_start_threads(&si->ntfytq, 1, PI_NET, "tq %s", name);
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if (err) {
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taskqueue_free(si->ntfytq);
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si->ntfytq = NULL;
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return err;
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}
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snprintf(si->mtxname, sizeof(si->mtxname), "nmkl%s", name);
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mtx_init(&si->m, si->mtxname, NULL, MTX_DEF);
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knlist_init_mtx(&si->si.si_note, &si->m);
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si->kqueue_users = 0;
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return (0);
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}
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void
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nm_os_selinfo_uninit(NM_SELINFO_T *si)
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{
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if (si->ntfytq == NULL) {
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return; /* si was not initialized */
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}
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taskqueue_drain(si->ntfytq, &si->ntfytask);
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taskqueue_free(si->ntfytq);
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si->ntfytq = NULL;
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knlist_delete(&si->si.si_note, curthread, /*islocked=*/0);
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knlist_destroy(&si->si.si_note);
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/* now we don't need the mutex anymore */
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mtx_destroy(&si->m);
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}
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void *
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nm_os_malloc(size_t size)
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{
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return malloc(size, M_DEVBUF, M_NOWAIT | M_ZERO);
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}
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void *
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nm_os_realloc(void *addr, size_t new_size, size_t old_size __unused)
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{
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return realloc(addr, new_size, M_DEVBUF, M_NOWAIT | M_ZERO);
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}
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void
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nm_os_free(void *addr)
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{
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free(addr, M_DEVBUF);
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}
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void
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nm_os_ifnet_lock(void)
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{
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IFNET_RLOCK();
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}
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void
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nm_os_ifnet_unlock(void)
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{
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IFNET_RUNLOCK();
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}
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static int netmap_use_count = 0;
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void
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nm_os_get_module(void)
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{
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netmap_use_count++;
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}
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void
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nm_os_put_module(void)
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{
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netmap_use_count--;
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}
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static void
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netmap_ifnet_arrival_handler(void *arg __unused, if_t ifp)
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{
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netmap_undo_zombie(ifp);
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}
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static void
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netmap_ifnet_departure_handler(void *arg __unused, if_t ifp)
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{
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netmap_make_zombie(ifp);
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}
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static eventhandler_tag nm_ifnet_ah_tag;
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static eventhandler_tag nm_ifnet_dh_tag;
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int
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nm_os_ifnet_init(void)
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{
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nm_ifnet_ah_tag =
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EVENTHANDLER_REGISTER(ifnet_arrival_event,
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netmap_ifnet_arrival_handler,
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NULL, EVENTHANDLER_PRI_ANY);
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nm_ifnet_dh_tag =
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EVENTHANDLER_REGISTER(ifnet_departure_event,
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netmap_ifnet_departure_handler,
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NULL, EVENTHANDLER_PRI_ANY);
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return 0;
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}
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void
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nm_os_ifnet_fini(void)
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{
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EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
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nm_ifnet_ah_tag);
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EVENTHANDLER_DEREGISTER(ifnet_departure_event,
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nm_ifnet_dh_tag);
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}
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unsigned
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nm_os_ifnet_mtu(if_t ifp)
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{
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return if_getmtu(ifp);
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}
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rawsum_t
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nm_os_csum_raw(uint8_t *data, size_t len, rawsum_t cur_sum)
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{
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/* TODO XXX please use the FreeBSD implementation for this. */
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uint16_t *words = (uint16_t *)data;
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int nw = len / 2;
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int i;
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for (i = 0; i < nw; i++)
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cur_sum += be16toh(words[i]);
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if (len & 1)
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cur_sum += (data[len-1] << 8);
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return cur_sum;
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}
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/* Fold a raw checksum: 'cur_sum' is in host byte order, while the
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* return value is in network byte order.
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*/
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uint16_t
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nm_os_csum_fold(rawsum_t cur_sum)
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{
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/* TODO XXX please use the FreeBSD implementation for this. */
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while (cur_sum >> 16)
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cur_sum = (cur_sum & 0xFFFF) + (cur_sum >> 16);
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return htobe16((~cur_sum) & 0xFFFF);
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}
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uint16_t nm_os_csum_ipv4(struct nm_iphdr *iph)
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{
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#if 0
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return in_cksum_hdr((void *)iph);
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#else
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return nm_os_csum_fold(nm_os_csum_raw((uint8_t*)iph, sizeof(struct nm_iphdr), 0));
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#endif
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}
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void
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nm_os_csum_tcpudp_ipv4(struct nm_iphdr *iph, void *data,
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size_t datalen, uint16_t *check)
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{
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#ifdef INET
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uint16_t pseudolen = datalen + iph->protocol;
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/* Compute and insert the pseudo-header checksum. */
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*check = in_pseudo(iph->saddr, iph->daddr,
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htobe16(pseudolen));
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/* Compute the checksum on TCP/UDP header + payload
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* (includes the pseudo-header).
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*/
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*check = nm_os_csum_fold(nm_os_csum_raw(data, datalen, 0));
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#else
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static int notsupported = 0;
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if (!notsupported) {
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notsupported = 1;
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nm_prerr("inet4 segmentation not supported");
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}
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#endif
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}
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void
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nm_os_csum_tcpudp_ipv6(struct nm_ipv6hdr *ip6h, void *data,
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size_t datalen, uint16_t *check)
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{
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#ifdef INET6
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*check = in6_cksum_pseudo((void*)ip6h, datalen, ip6h->nexthdr, 0);
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*check = nm_os_csum_fold(nm_os_csum_raw(data, datalen, 0));
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#else
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static int notsupported = 0;
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if (!notsupported) {
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notsupported = 1;
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nm_prerr("inet6 segmentation not supported");
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}
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#endif
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}
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/* on FreeBSD we send up one packet at a time */
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void *
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nm_os_send_up(if_t ifp, struct mbuf *m, struct mbuf *prev)
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{
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NA(ifp)->if_input(ifp, m);
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return NULL;
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}
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int
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nm_os_mbuf_has_csum_offld(struct mbuf *m)
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{
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return m->m_pkthdr.csum_flags & (CSUM_TCP | CSUM_UDP | CSUM_SCTP |
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CSUM_TCP_IPV6 | CSUM_UDP_IPV6 |
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CSUM_SCTP_IPV6);
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}
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int
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nm_os_mbuf_has_seg_offld(struct mbuf *m)
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{
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return m->m_pkthdr.csum_flags & CSUM_TSO;
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}
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static void
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freebsd_generic_rx_handler(if_t ifp, struct mbuf *m)
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{
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int stolen;
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if (unlikely(!NM_NA_VALID(ifp))) {
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nm_prlim(1, "Warning: RX packet intercepted, but no"
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" emulated adapter");
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return;
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}
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do {
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struct mbuf *n;
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n = m->m_nextpkt;
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m->m_nextpkt = NULL;
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stolen = generic_rx_handler(ifp, m);
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if (!stolen) {
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NA(ifp)->if_input(ifp, m);
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}
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m = n;
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} while (m != NULL);
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}
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/*
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* Intercept the rx routine in the standard device driver.
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* Second argument is non-zero to intercept, 0 to restore
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*/
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int
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nm_os_catch_rx(struct netmap_generic_adapter *gna, int intercept)
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{
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struct netmap_adapter *na = &gna->up.up;
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if_t ifp = na->ifp;
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int ret = 0;
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nm_os_ifnet_lock();
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if (intercept) {
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if_setcapenablebit(ifp, IFCAP_NETMAP, 0);
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if_setinputfn(ifp, freebsd_generic_rx_handler);
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} else {
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if_setcapenablebit(ifp, 0, IFCAP_NETMAP);
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if_setinputfn(ifp, na->if_input);
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}
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nm_os_ifnet_unlock();
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return ret;
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}
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/*
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* Intercept the packet steering routine in the tx path,
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* so that we can decide which queue is used for an mbuf.
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* Second argument is non-zero to intercept, 0 to restore.
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* On freebsd we just intercept if_transmit.
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*/
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int
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nm_os_catch_tx(struct netmap_generic_adapter *gna, int intercept)
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{
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struct netmap_adapter *na = &gna->up.up;
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if_t ifp = netmap_generic_getifp(gna);
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nm_os_ifnet_lock();
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if (intercept) {
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na->if_transmit = if_gettransmitfn(ifp);
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if_settransmitfn(ifp, netmap_transmit);
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} else {
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if_settransmitfn(ifp, na->if_transmit);
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}
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nm_os_ifnet_unlock();
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return 0;
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}
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/*
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* Transmit routine used by generic_netmap_txsync(). Returns 0 on success
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* and non-zero on error (which may be packet drops or other errors).
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* addr and len identify the netmap buffer, m is the (preallocated)
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* mbuf to use for transmissions.
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*
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* Zero-copy transmission is possible if netmap is attached directly to a
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* hardware interface: when cleaning we simply wait for the mbuf cluster
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* refcount to decrement to 1, indicating that the driver has completed
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* transmission and is done with the buffer. However, this approach can
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* lead to queue deadlocks when attaching to software interfaces (e.g.,
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* if_bridge) since we cannot rely on member ports to promptly reclaim
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* transmitted mbufs. Since there is no easy way to distinguish these
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* cases, we currently always copy the buffer.
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*
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* On multiqueue cards, we can force the queue using
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* if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
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* i = m->m_pkthdr.flowid % adapter->num_queues;
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* else
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* i = curcpu % adapter->num_queues;
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*/
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int
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nm_os_generic_xmit_frame(struct nm_os_gen_arg *a)
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{
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int ret;
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u_int len = a->len;
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if_t ifp = a->ifp;
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struct mbuf *m = a->m;
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M_ASSERTPKTHDR(m);
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KASSERT((m->m_flags & M_EXT) != 0,
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("%s: mbuf %p has no cluster", __func__, m));
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if (MBUF_REFCNT(m) != 1) {
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nm_prerr("invalid refcnt %d for %p", MBUF_REFCNT(m), m);
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panic("in generic_xmit_frame");
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}
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if (unlikely(m->m_ext.ext_size < len)) {
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nm_prlim(2, "size %d < len %d", m->m_ext.ext_size, len);
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len = m->m_ext.ext_size;
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}
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m_copyback(m, 0, len, a->addr);
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m->m_len = m->m_pkthdr.len = len;
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SET_MBUF_REFCNT(m, 2);
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M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
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m->m_pkthdr.flowid = a->ring_nr;
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m->m_pkthdr.rcvif = ifp; /* used for tx notification */
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CURVNET_SET(if_getvnet(ifp));
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ret = NA(ifp)->if_transmit(ifp, m);
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CURVNET_RESTORE();
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return ret ? -1 : 0;
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}
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struct netmap_adapter *
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netmap_getna(if_t ifp)
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{
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return (NA(ifp));
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}
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/*
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* The following two functions are empty until we have a generic
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* way to extract the info from the ifp
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*/
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int
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nm_os_generic_find_num_desc(if_t ifp, unsigned int *tx, unsigned int *rx)
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{
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return 0;
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}
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void
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nm_os_generic_find_num_queues(if_t ifp, u_int *txq, u_int *rxq)
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{
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unsigned num_rings = netmap_generic_rings ? netmap_generic_rings : 1;
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*txq = num_rings;
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*rxq = num_rings;
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}
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void
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nm_os_generic_set_features(struct netmap_generic_adapter *gna)
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{
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gna->rxsg = 1; /* Supported through m_copydata. */
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gna->txqdisc = 0; /* Not supported. */
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}
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void
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nm_os_mitigation_init(struct nm_generic_mit *mit, int idx, struct netmap_adapter *na)
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{
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mit->mit_pending = 0;
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mit->mit_ring_idx = idx;
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mit->mit_na = na;
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}
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void
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nm_os_mitigation_start(struct nm_generic_mit *mit)
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{
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}
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void
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nm_os_mitigation_restart(struct nm_generic_mit *mit)
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{
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}
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int
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nm_os_mitigation_active(struct nm_generic_mit *mit)
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{
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return 0;
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}
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void
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nm_os_mitigation_cleanup(struct nm_generic_mit *mit)
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{
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}
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static int
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|
nm_vi_dummy(if_t ifp, u_long cmd, caddr_t addr)
|
|
{
|
|
|
|
return EINVAL;
|
|
}
|
|
|
|
static void
|
|
nm_vi_start(if_t ifp)
|
|
{
|
|
panic("nm_vi_start() must not be called");
|
|
}
|
|
|
|
/*
|
|
* Index manager of persistent virtual interfaces.
|
|
* It is used to decide the lowest byte of the MAC address.
|
|
* We use the same algorithm with management of bridge port index.
|
|
*/
|
|
#define NM_VI_MAX 255
|
|
static struct {
|
|
uint8_t index[NM_VI_MAX]; /* XXX just for a reasonable number */
|
|
uint8_t active;
|
|
struct mtx lock;
|
|
} nm_vi_indices;
|
|
|
|
void
|
|
nm_os_vi_init_index(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < NM_VI_MAX; i++)
|
|
nm_vi_indices.index[i] = i;
|
|
nm_vi_indices.active = 0;
|
|
mtx_init(&nm_vi_indices.lock, "nm_vi_indices_lock", NULL, MTX_DEF);
|
|
}
|
|
|
|
/* return -1 if no index available */
|
|
static int
|
|
nm_vi_get_index(void)
|
|
{
|
|
int ret;
|
|
|
|
mtx_lock(&nm_vi_indices.lock);
|
|
ret = nm_vi_indices.active == NM_VI_MAX ? -1 :
|
|
nm_vi_indices.index[nm_vi_indices.active++];
|
|
mtx_unlock(&nm_vi_indices.lock);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
nm_vi_free_index(uint8_t val)
|
|
{
|
|
int i, lim;
|
|
|
|
mtx_lock(&nm_vi_indices.lock);
|
|
lim = nm_vi_indices.active;
|
|
for (i = 0; i < lim; i++) {
|
|
if (nm_vi_indices.index[i] == val) {
|
|
/* swap index[lim-1] and j */
|
|
int tmp = nm_vi_indices.index[lim-1];
|
|
nm_vi_indices.index[lim-1] = val;
|
|
nm_vi_indices.index[i] = tmp;
|
|
nm_vi_indices.active--;
|
|
break;
|
|
}
|
|
}
|
|
if (lim == nm_vi_indices.active)
|
|
nm_prerr("Index %u not found", val);
|
|
mtx_unlock(&nm_vi_indices.lock);
|
|
}
|
|
#undef NM_VI_MAX
|
|
|
|
/*
|
|
* Implementation of a netmap-capable virtual interface that
|
|
* registered to the system.
|
|
* It is based on if_tap.c and ip_fw_log.c in FreeBSD 9.
|
|
*
|
|
* Note: Linux sets refcount to 0 on allocation of net_device,
|
|
* then increments it on registration to the system.
|
|
* FreeBSD sets refcount to 1 on if_alloc(), and does not
|
|
* increment this refcount on if_attach().
|
|
*/
|
|
int
|
|
nm_os_vi_persist(const char *name, if_t *ret)
|
|
{
|
|
if_t ifp;
|
|
u_short macaddr_hi;
|
|
uint32_t macaddr_mid;
|
|
u_char eaddr[6];
|
|
int unit = nm_vi_get_index(); /* just to decide MAC address */
|
|
|
|
if (unit < 0)
|
|
return EBUSY;
|
|
/*
|
|
* We use the same MAC address generation method with tap
|
|
* except for the highest octet is 00:be instead of 00:bd
|
|
*/
|
|
macaddr_hi = htons(0x00be); /* XXX tap + 1 */
|
|
macaddr_mid = (uint32_t) ticks;
|
|
bcopy(&macaddr_hi, eaddr, sizeof(short));
|
|
bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
|
|
eaddr[5] = (uint8_t)unit;
|
|
|
|
ifp = if_alloc(IFT_ETHER);
|
|
if (ifp == NULL) {
|
|
nm_prerr("if_alloc failed");
|
|
return ENOMEM;
|
|
}
|
|
if_initname(ifp, name, IF_DUNIT_NONE);
|
|
if_setflags(ifp, IFF_UP | IFF_SIMPLEX | IFF_MULTICAST);
|
|
if_setinitfn(ifp, (void *)nm_vi_dummy);
|
|
if_setioctlfn(ifp, nm_vi_dummy);
|
|
if_setstartfn(ifp, nm_vi_start);
|
|
if_setmtu(ifp, ETHERMTU);
|
|
if_setsendqlen(ifp, ifqmaxlen);
|
|
if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0);
|
|
if_setcapenablebit(ifp, IFCAP_LINKSTATE, 0);
|
|
|
|
ether_ifattach(ifp, eaddr);
|
|
*ret = ifp;
|
|
return 0;
|
|
}
|
|
|
|
/* unregister from the system and drop the final refcount */
|
|
void
|
|
nm_os_vi_detach(if_t ifp)
|
|
{
|
|
nm_vi_free_index(((char *)if_getlladdr(ifp))[5]);
|
|
ether_ifdetach(ifp);
|
|
if_free(ifp);
|
|
}
|
|
|
|
#ifdef WITH_EXTMEM
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_kern.h>
|
|
struct nm_os_extmem {
|
|
vm_object_t obj;
|
|
vm_offset_t kva;
|
|
vm_offset_t size;
|
|
uintptr_t scan;
|
|
};
|
|
|
|
void
|
|
nm_os_extmem_delete(struct nm_os_extmem *e)
|
|
{
|
|
nm_prinf("freeing %zx bytes", (size_t)e->size);
|
|
vm_map_remove(kernel_map, e->kva, e->kva + e->size);
|
|
nm_os_free(e);
|
|
}
|
|
|
|
char *
|
|
nm_os_extmem_nextpage(struct nm_os_extmem *e)
|
|
{
|
|
char *rv = NULL;
|
|
if (e->scan < e->kva + e->size) {
|
|
rv = (char *)e->scan;
|
|
e->scan += PAGE_SIZE;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
int
|
|
nm_os_extmem_isequal(struct nm_os_extmem *e1, struct nm_os_extmem *e2)
|
|
{
|
|
return (e1->obj == e2->obj);
|
|
}
|
|
|
|
int
|
|
nm_os_extmem_nr_pages(struct nm_os_extmem *e)
|
|
{
|
|
return e->size >> PAGE_SHIFT;
|
|
}
|
|
|
|
struct nm_os_extmem *
|
|
nm_os_extmem_create(unsigned long p, struct nmreq_pools_info *pi, int *perror)
|
|
{
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
vm_object_t obj;
|
|
vm_prot_t prot;
|
|
vm_pindex_t index;
|
|
boolean_t wired;
|
|
struct nm_os_extmem *e = NULL;
|
|
int rv, error = 0;
|
|
|
|
e = nm_os_malloc(sizeof(*e));
|
|
if (e == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
map = &curthread->td_proc->p_vmspace->vm_map;
|
|
rv = vm_map_lookup(&map, p, VM_PROT_RW, &entry,
|
|
&obj, &index, &prot, &wired);
|
|
if (rv != KERN_SUCCESS) {
|
|
nm_prerr("address %lx not found", p);
|
|
error = vm_mmap_to_errno(rv);
|
|
goto out_free;
|
|
}
|
|
vm_object_reference(obj);
|
|
|
|
/* check that we are given the whole vm_object ? */
|
|
vm_map_lookup_done(map, entry);
|
|
|
|
e->obj = obj;
|
|
/* Wire the memory and add the vm_object to the kernel map,
|
|
* to make sure that it is not freed even if all the processes
|
|
* that are mmap()ing should munmap() it.
|
|
*/
|
|
e->kva = vm_map_min(kernel_map);
|
|
e->size = obj->size << PAGE_SHIFT;
|
|
rv = vm_map_find(kernel_map, obj, 0, &e->kva, e->size, 0,
|
|
VMFS_OPTIMAL_SPACE, VM_PROT_READ | VM_PROT_WRITE,
|
|
VM_PROT_READ | VM_PROT_WRITE, 0);
|
|
if (rv != KERN_SUCCESS) {
|
|
nm_prerr("vm_map_find(%zx) failed", (size_t)e->size);
|
|
error = vm_mmap_to_errno(rv);
|
|
goto out_rel;
|
|
}
|
|
rv = vm_map_wire(kernel_map, e->kva, e->kva + e->size,
|
|
VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
|
|
if (rv != KERN_SUCCESS) {
|
|
nm_prerr("vm_map_wire failed");
|
|
error = vm_mmap_to_errno(rv);
|
|
goto out_rem;
|
|
}
|
|
|
|
e->scan = e->kva;
|
|
|
|
return e;
|
|
|
|
out_rem:
|
|
vm_map_remove(kernel_map, e->kva, e->kva + e->size);
|
|
out_rel:
|
|
vm_object_deallocate(e->obj);
|
|
e->obj = NULL;
|
|
out_free:
|
|
nm_os_free(e);
|
|
out:
|
|
if (perror)
|
|
*perror = error;
|
|
return NULL;
|
|
}
|
|
#endif /* WITH_EXTMEM */
|
|
|
|
/* ================== PTNETMAP GUEST SUPPORT ==================== */
|
|
|
|
#ifdef WITH_PTNETMAP
|
|
#include <sys/bus.h>
|
|
#include <sys/rman.h>
|
|
#include <machine/bus.h> /* bus_dmamap_* */
|
|
#include <machine/resource.h>
|
|
#include <dev/pci/pcivar.h>
|
|
#include <dev/pci/pcireg.h>
|
|
/*
|
|
* ptnetmap memory device (memdev) for freebsd guest,
|
|
* ssed to expose host netmap memory to the guest through a PCI BAR.
|
|
*/
|
|
|
|
/*
|
|
* ptnetmap memdev private data structure
|
|
*/
|
|
struct ptnetmap_memdev {
|
|
device_t dev;
|
|
struct resource *pci_io;
|
|
struct resource *pci_mem;
|
|
struct netmap_mem_d *nm_mem;
|
|
};
|
|
|
|
static int ptn_memdev_probe(device_t);
|
|
static int ptn_memdev_attach(device_t);
|
|
static int ptn_memdev_detach(device_t);
|
|
static int ptn_memdev_shutdown(device_t);
|
|
|
|
static device_method_t ptn_memdev_methods[] = {
|
|
DEVMETHOD(device_probe, ptn_memdev_probe),
|
|
DEVMETHOD(device_attach, ptn_memdev_attach),
|
|
DEVMETHOD(device_detach, ptn_memdev_detach),
|
|
DEVMETHOD(device_shutdown, ptn_memdev_shutdown),
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t ptn_memdev_driver = {
|
|
PTNETMAP_MEMDEV_NAME,
|
|
ptn_memdev_methods,
|
|
sizeof(struct ptnetmap_memdev),
|
|
};
|
|
|
|
/* We use (SI_ORDER_MIDDLE+1) here, see DEV_MODULE_ORDERED() invocation
|
|
* below. */
|
|
DRIVER_MODULE_ORDERED(ptn_memdev, pci, ptn_memdev_driver, NULL, NULL,
|
|
SI_ORDER_MIDDLE + 1);
|
|
|
|
/*
|
|
* Map host netmap memory through PCI-BAR in the guest OS,
|
|
* returning physical (nm_paddr) and virtual (nm_addr) addresses
|
|
* of the netmap memory mapped in the guest.
|
|
*/
|
|
int
|
|
nm_os_pt_memdev_iomap(struct ptnetmap_memdev *ptn_dev, vm_paddr_t *nm_paddr,
|
|
void **nm_addr, uint64_t *mem_size)
|
|
{
|
|
int rid;
|
|
|
|
nm_prinf("ptn_memdev_driver iomap");
|
|
|
|
rid = PCIR_BAR(PTNETMAP_MEM_PCI_BAR);
|
|
*mem_size = bus_read_4(ptn_dev->pci_io, PTNET_MDEV_IO_MEMSIZE_HI);
|
|
*mem_size = bus_read_4(ptn_dev->pci_io, PTNET_MDEV_IO_MEMSIZE_LO) |
|
|
(*mem_size << 32);
|
|
|
|
/* map memory allocator */
|
|
ptn_dev->pci_mem = bus_alloc_resource(ptn_dev->dev, SYS_RES_MEMORY,
|
|
&rid, 0, ~0, *mem_size, RF_ACTIVE);
|
|
if (ptn_dev->pci_mem == NULL) {
|
|
*nm_paddr = 0;
|
|
*nm_addr = NULL;
|
|
return ENOMEM;
|
|
}
|
|
|
|
*nm_paddr = rman_get_start(ptn_dev->pci_mem);
|
|
*nm_addr = rman_get_virtual(ptn_dev->pci_mem);
|
|
|
|
nm_prinf("=== BAR %d start %lx len %lx mem_size %lx ===",
|
|
PTNETMAP_MEM_PCI_BAR,
|
|
(unsigned long)(*nm_paddr),
|
|
(unsigned long)rman_get_size(ptn_dev->pci_mem),
|
|
(unsigned long)*mem_size);
|
|
return (0);
|
|
}
|
|
|
|
uint32_t
|
|
nm_os_pt_memdev_ioread(struct ptnetmap_memdev *ptn_dev, unsigned int reg)
|
|
{
|
|
return bus_read_4(ptn_dev->pci_io, reg);
|
|
}
|
|
|
|
/* Unmap host netmap memory. */
|
|
void
|
|
nm_os_pt_memdev_iounmap(struct ptnetmap_memdev *ptn_dev)
|
|
{
|
|
nm_prinf("ptn_memdev_driver iounmap");
|
|
|
|
if (ptn_dev->pci_mem) {
|
|
bus_release_resource(ptn_dev->dev, SYS_RES_MEMORY,
|
|
PCIR_BAR(PTNETMAP_MEM_PCI_BAR), ptn_dev->pci_mem);
|
|
ptn_dev->pci_mem = NULL;
|
|
}
|
|
}
|
|
|
|
/* Device identification routine, return BUS_PROBE_DEFAULT on success,
|
|
* positive on failure */
|
|
static int
|
|
ptn_memdev_probe(device_t dev)
|
|
{
|
|
char desc[256];
|
|
|
|
if (pci_get_vendor(dev) != PTNETMAP_PCI_VENDOR_ID)
|
|
return (ENXIO);
|
|
if (pci_get_device(dev) != PTNETMAP_PCI_DEVICE_ID)
|
|
return (ENXIO);
|
|
|
|
snprintf(desc, sizeof(desc), "%s PCI adapter",
|
|
PTNETMAP_MEMDEV_NAME);
|
|
device_set_desc_copy(dev, desc);
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
/* Device initialization routine. */
|
|
static int
|
|
ptn_memdev_attach(device_t dev)
|
|
{
|
|
struct ptnetmap_memdev *ptn_dev;
|
|
int rid;
|
|
uint16_t mem_id;
|
|
|
|
ptn_dev = device_get_softc(dev);
|
|
ptn_dev->dev = dev;
|
|
|
|
pci_enable_busmaster(dev);
|
|
|
|
rid = PCIR_BAR(PTNETMAP_IO_PCI_BAR);
|
|
ptn_dev->pci_io = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
|
|
RF_ACTIVE);
|
|
if (ptn_dev->pci_io == NULL) {
|
|
device_printf(dev, "cannot map I/O space\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
mem_id = bus_read_4(ptn_dev->pci_io, PTNET_MDEV_IO_MEMID);
|
|
|
|
/* create guest allocator */
|
|
ptn_dev->nm_mem = netmap_mem_pt_guest_attach(ptn_dev, mem_id);
|
|
if (ptn_dev->nm_mem == NULL) {
|
|
ptn_memdev_detach(dev);
|
|
return (ENOMEM);
|
|
}
|
|
netmap_mem_get(ptn_dev->nm_mem);
|
|
|
|
nm_prinf("ptnetmap memdev attached, host memid: %u", mem_id);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Device removal routine. */
|
|
static int
|
|
ptn_memdev_detach(device_t dev)
|
|
{
|
|
struct ptnetmap_memdev *ptn_dev;
|
|
|
|
ptn_dev = device_get_softc(dev);
|
|
|
|
if (ptn_dev->nm_mem) {
|
|
nm_prinf("ptnetmap memdev detached, host memid %u",
|
|
netmap_mem_get_id(ptn_dev->nm_mem));
|
|
netmap_mem_put(ptn_dev->nm_mem);
|
|
ptn_dev->nm_mem = NULL;
|
|
}
|
|
if (ptn_dev->pci_mem) {
|
|
bus_release_resource(dev, SYS_RES_MEMORY,
|
|
PCIR_BAR(PTNETMAP_MEM_PCI_BAR), ptn_dev->pci_mem);
|
|
ptn_dev->pci_mem = NULL;
|
|
}
|
|
if (ptn_dev->pci_io) {
|
|
bus_release_resource(dev, SYS_RES_IOPORT,
|
|
PCIR_BAR(PTNETMAP_IO_PCI_BAR), ptn_dev->pci_io);
|
|
ptn_dev->pci_io = NULL;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ptn_memdev_shutdown(device_t dev)
|
|
{
|
|
return bus_generic_shutdown(dev);
|
|
}
|
|
|
|
#endif /* WITH_PTNETMAP */
|
|
|
|
/*
|
|
* In order to track whether pages are still mapped, we hook into
|
|
* the standard cdev_pager and intercept the constructor and
|
|
* destructor.
|
|
*/
|
|
|
|
struct netmap_vm_handle_t {
|
|
struct cdev *dev;
|
|
struct netmap_priv_d *priv;
|
|
};
|
|
|
|
|
|
static int
|
|
netmap_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
|
|
vm_ooffset_t foff, struct ucred *cred, u_short *color)
|
|
{
|
|
struct netmap_vm_handle_t *vmh = handle;
|
|
|
|
if (netmap_verbose)
|
|
nm_prinf("handle %p size %jd prot %d foff %jd",
|
|
handle, (intmax_t)size, prot, (intmax_t)foff);
|
|
if (color)
|
|
*color = 0;
|
|
dev_ref(vmh->dev);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
netmap_dev_pager_dtor(void *handle)
|
|
{
|
|
struct netmap_vm_handle_t *vmh = handle;
|
|
struct cdev *dev = vmh->dev;
|
|
struct netmap_priv_d *priv = vmh->priv;
|
|
|
|
if (netmap_verbose)
|
|
nm_prinf("handle %p", handle);
|
|
netmap_dtor(priv);
|
|
free(vmh, M_DEVBUF);
|
|
dev_rel(dev);
|
|
}
|
|
|
|
|
|
static int
|
|
netmap_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
|
|
int prot, vm_page_t *mres)
|
|
{
|
|
struct netmap_vm_handle_t *vmh = object->handle;
|
|
struct netmap_priv_d *priv = vmh->priv;
|
|
struct netmap_adapter *na = priv->np_na;
|
|
vm_paddr_t paddr;
|
|
vm_page_t page;
|
|
vm_memattr_t memattr;
|
|
|
|
nm_prdis("object %p offset %jd prot %d mres %p",
|
|
object, (intmax_t)offset, prot, mres);
|
|
memattr = object->memattr;
|
|
paddr = netmap_mem_ofstophys(na->nm_mem, offset);
|
|
if (paddr == 0)
|
|
return VM_PAGER_FAIL;
|
|
|
|
if (((*mres)->flags & PG_FICTITIOUS) != 0) {
|
|
/*
|
|
* If the passed in result page is a fake page, update it with
|
|
* the new physical address.
|
|
*/
|
|
page = *mres;
|
|
vm_page_updatefake(page, paddr, memattr);
|
|
} else {
|
|
/*
|
|
* Replace the passed in reqpage page with our own fake page and
|
|
* free up the all of the original pages.
|
|
*/
|
|
VM_OBJECT_WUNLOCK(object);
|
|
page = vm_page_getfake(paddr, memattr);
|
|
VM_OBJECT_WLOCK(object);
|
|
vm_page_replace(page, object, (*mres)->pindex, *mres);
|
|
*mres = page;
|
|
}
|
|
page->valid = VM_PAGE_BITS_ALL;
|
|
return (VM_PAGER_OK);
|
|
}
|
|
|
|
|
|
static struct cdev_pager_ops netmap_cdev_pager_ops = {
|
|
.cdev_pg_ctor = netmap_dev_pager_ctor,
|
|
.cdev_pg_dtor = netmap_dev_pager_dtor,
|
|
.cdev_pg_fault = netmap_dev_pager_fault,
|
|
};
|
|
|
|
|
|
static int
|
|
netmap_mmap_single(struct cdev *cdev, vm_ooffset_t *foff,
|
|
vm_size_t objsize, vm_object_t *objp, int prot)
|
|
{
|
|
int error;
|
|
struct netmap_vm_handle_t *vmh;
|
|
struct netmap_priv_d *priv;
|
|
vm_object_t obj;
|
|
|
|
if (netmap_verbose)
|
|
nm_prinf("cdev %p foff %jd size %jd objp %p prot %d", cdev,
|
|
(intmax_t )*foff, (intmax_t )objsize, objp, prot);
|
|
|
|
vmh = malloc(sizeof(struct netmap_vm_handle_t), M_DEVBUF,
|
|
M_NOWAIT | M_ZERO);
|
|
if (vmh == NULL)
|
|
return ENOMEM;
|
|
vmh->dev = cdev;
|
|
|
|
NMG_LOCK();
|
|
error = devfs_get_cdevpriv((void**)&priv);
|
|
if (error)
|
|
goto err_unlock;
|
|
if (priv->np_nifp == NULL) {
|
|
error = EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
vmh->priv = priv;
|
|
priv->np_refs++;
|
|
NMG_UNLOCK();
|
|
|
|
obj = cdev_pager_allocate(vmh, OBJT_DEVICE,
|
|
&netmap_cdev_pager_ops, objsize, prot,
|
|
*foff, NULL);
|
|
if (obj == NULL) {
|
|
nm_prerr("cdev_pager_allocate failed");
|
|
error = EINVAL;
|
|
goto err_deref;
|
|
}
|
|
|
|
*objp = obj;
|
|
return 0;
|
|
|
|
err_deref:
|
|
NMG_LOCK();
|
|
priv->np_refs--;
|
|
err_unlock:
|
|
NMG_UNLOCK();
|
|
// err:
|
|
free(vmh, M_DEVBUF);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* On FreeBSD the close routine is only called on the last close on
|
|
* the device (/dev/netmap) so we cannot do anything useful.
|
|
* To track close() on individual file descriptors we pass netmap_dtor() to
|
|
* devfs_set_cdevpriv() on open(). The FreeBSD kernel will call the destructor
|
|
* when the last fd pointing to the device is closed.
|
|
*
|
|
* Note that FreeBSD does not even munmap() on close() so we also have
|
|
* to track mmap() ourselves, and postpone the call to
|
|
* netmap_dtor() is called when the process has no open fds and no active
|
|
* memory maps on /dev/netmap, as in linux.
|
|
*/
|
|
static int
|
|
netmap_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
|
|
{
|
|
if (netmap_verbose)
|
|
nm_prinf("dev %p fflag 0x%x devtype %d td %p",
|
|
dev, fflag, devtype, td);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
netmap_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
|
|
{
|
|
struct netmap_priv_d *priv;
|
|
int error;
|
|
|
|
(void)dev;
|
|
(void)oflags;
|
|
(void)devtype;
|
|
(void)td;
|
|
|
|
NMG_LOCK();
|
|
priv = netmap_priv_new();
|
|
if (priv == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
error = devfs_set_cdevpriv(priv, netmap_dtor);
|
|
if (error) {
|
|
netmap_priv_delete(priv);
|
|
}
|
|
out:
|
|
NMG_UNLOCK();
|
|
return error;
|
|
}
|
|
|
|
/******************** kthread wrapper ****************/
|
|
#include <sys/sysproto.h>
|
|
u_int
|
|
nm_os_ncpus(void)
|
|
{
|
|
return mp_maxid + 1;
|
|
}
|
|
|
|
struct nm_kctx_ctx {
|
|
/* Userspace thread (kthread creator). */
|
|
struct thread *user_td;
|
|
|
|
/* worker function and parameter */
|
|
nm_kctx_worker_fn_t worker_fn;
|
|
void *worker_private;
|
|
|
|
struct nm_kctx *nmk;
|
|
|
|
/* integer to manage multiple worker contexts (e.g., RX or TX on ptnetmap) */
|
|
long type;
|
|
};
|
|
|
|
struct nm_kctx {
|
|
struct thread *worker;
|
|
struct mtx worker_lock;
|
|
struct nm_kctx_ctx worker_ctx;
|
|
int run; /* used to stop kthread */
|
|
int attach_user; /* kthread attached to user_process */
|
|
int affinity;
|
|
};
|
|
|
|
static void
|
|
nm_kctx_worker(void *data)
|
|
{
|
|
struct nm_kctx *nmk = data;
|
|
struct nm_kctx_ctx *ctx = &nmk->worker_ctx;
|
|
|
|
if (nmk->affinity >= 0) {
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, nmk->affinity);
|
|
thread_unlock(curthread);
|
|
}
|
|
|
|
while (nmk->run) {
|
|
/*
|
|
* check if the parent process dies
|
|
* (when kthread is attached to user process)
|
|
*/
|
|
if (ctx->user_td) {
|
|
PROC_LOCK(curproc);
|
|
thread_suspend_check(0);
|
|
PROC_UNLOCK(curproc);
|
|
} else {
|
|
kthread_suspend_check();
|
|
}
|
|
|
|
/* Continuously execute worker process. */
|
|
ctx->worker_fn(ctx->worker_private); /* worker body */
|
|
}
|
|
|
|
kthread_exit();
|
|
}
|
|
|
|
void
|
|
nm_os_kctx_worker_setaff(struct nm_kctx *nmk, int affinity)
|
|
{
|
|
nmk->affinity = affinity;
|
|
}
|
|
|
|
struct nm_kctx *
|
|
nm_os_kctx_create(struct nm_kctx_cfg *cfg, void *opaque)
|
|
{
|
|
struct nm_kctx *nmk = NULL;
|
|
|
|
nmk = malloc(sizeof(*nmk), M_DEVBUF, M_NOWAIT | M_ZERO);
|
|
if (!nmk)
|
|
return NULL;
|
|
|
|
mtx_init(&nmk->worker_lock, "nm_kthread lock", NULL, MTX_DEF);
|
|
nmk->worker_ctx.worker_fn = cfg->worker_fn;
|
|
nmk->worker_ctx.worker_private = cfg->worker_private;
|
|
nmk->worker_ctx.type = cfg->type;
|
|
nmk->affinity = -1;
|
|
|
|
/* attach kthread to user process (ptnetmap) */
|
|
nmk->attach_user = cfg->attach_user;
|
|
|
|
return nmk;
|
|
}
|
|
|
|
int
|
|
nm_os_kctx_worker_start(struct nm_kctx *nmk)
|
|
{
|
|
struct proc *p = NULL;
|
|
int error = 0;
|
|
|
|
/* Temporarily disable this function as it is currently broken
|
|
* and causes kernel crashes. The failure can be triggered by
|
|
* the "vale_polling_enable_disable" test in ctrl-api-test.c. */
|
|
return EOPNOTSUPP;
|
|
|
|
if (nmk->worker)
|
|
return EBUSY;
|
|
|
|
/* check if we want to attach kthread to user process */
|
|
if (nmk->attach_user) {
|
|
nmk->worker_ctx.user_td = curthread;
|
|
p = curthread->td_proc;
|
|
}
|
|
|
|
/* enable kthread main loop */
|
|
nmk->run = 1;
|
|
/* create kthread */
|
|
if((error = kthread_add(nm_kctx_worker, nmk, p,
|
|
&nmk->worker, RFNOWAIT /* to be checked */, 0, "nm-kthread-%ld",
|
|
nmk->worker_ctx.type))) {
|
|
goto err;
|
|
}
|
|
|
|
nm_prinf("nm_kthread started td %p", nmk->worker);
|
|
|
|
return 0;
|
|
err:
|
|
nm_prerr("nm_kthread start failed err %d", error);
|
|
nmk->worker = NULL;
|
|
return error;
|
|
}
|
|
|
|
void
|
|
nm_os_kctx_worker_stop(struct nm_kctx *nmk)
|
|
{
|
|
if (!nmk->worker)
|
|
return;
|
|
|
|
/* tell to kthread to exit from main loop */
|
|
nmk->run = 0;
|
|
|
|
/* wake up kthread if it sleeps */
|
|
kthread_resume(nmk->worker);
|
|
|
|
nmk->worker = NULL;
|
|
}
|
|
|
|
void
|
|
nm_os_kctx_destroy(struct nm_kctx *nmk)
|
|
{
|
|
if (!nmk)
|
|
return;
|
|
|
|
if (nmk->worker)
|
|
nm_os_kctx_worker_stop(nmk);
|
|
|
|
free(nmk, M_DEVBUF);
|
|
}
|
|
|
|
/******************** kqueue support ****************/
|
|
|
|
/*
|
|
* In addition to calling selwakeuppri(), nm_os_selwakeup() also
|
|
* needs to call knote() to wake up kqueue listeners.
|
|
* This operation is deferred to a taskqueue in order to avoid possible
|
|
* lock order reversals; these may happen because knote() grabs a
|
|
* private lock associated to the 'si' (see struct selinfo,
|
|
* struct nm_selinfo, and nm_os_selinfo_init), and nm_os_selwakeup()
|
|
* can be called while holding the lock associated to a different
|
|
* 'si'.
|
|
* When calling knote() we use a non-zero 'hint' argument to inform
|
|
* the netmap_knrw() function that it is being called from
|
|
* 'nm_os_selwakeup'; this is necessary because when netmap_knrw() is
|
|
* called by the kevent subsystem (i.e. kevent_scan()) we also need to
|
|
* call netmap_poll().
|
|
*
|
|
* The netmap_kqfilter() function registers one or another f_event
|
|
* depending on read or write mode. A pointer to the struct
|
|
* 'netmap_priv_d' is stored into kn->kn_hook, so that it can later
|
|
* be passed to netmap_poll(). We pass NULL as a third argument to
|
|
* netmap_poll(), so that the latter only runs the txsync/rxsync
|
|
* (if necessary), and skips the nm_os_selrecord() calls.
|
|
*/
|
|
|
|
|
|
void
|
|
nm_os_selwakeup(struct nm_selinfo *si)
|
|
{
|
|
selwakeuppri(&si->si, PI_NET);
|
|
if (si->kqueue_users > 0) {
|
|
taskqueue_enqueue(si->ntfytq, &si->ntfytask);
|
|
}
|
|
}
|
|
|
|
void
|
|
nm_os_selrecord(struct thread *td, struct nm_selinfo *si)
|
|
{
|
|
selrecord(td, &si->si);
|
|
}
|
|
|
|
static void
|
|
netmap_knrdetach(struct knote *kn)
|
|
{
|
|
struct netmap_priv_d *priv = (struct netmap_priv_d *)kn->kn_hook;
|
|
struct nm_selinfo *si = priv->np_si[NR_RX];
|
|
|
|
knlist_remove(&si->si.si_note, kn, /*islocked=*/0);
|
|
NMG_LOCK();
|
|
KASSERT(si->kqueue_users > 0, ("kqueue_user underflow on %s",
|
|
si->mtxname));
|
|
si->kqueue_users--;
|
|
nm_prinf("kqueue users for %s: %d", si->mtxname, si->kqueue_users);
|
|
NMG_UNLOCK();
|
|
}
|
|
|
|
static void
|
|
netmap_knwdetach(struct knote *kn)
|
|
{
|
|
struct netmap_priv_d *priv = (struct netmap_priv_d *)kn->kn_hook;
|
|
struct nm_selinfo *si = priv->np_si[NR_TX];
|
|
|
|
knlist_remove(&si->si.si_note, kn, /*islocked=*/0);
|
|
NMG_LOCK();
|
|
si->kqueue_users--;
|
|
nm_prinf("kqueue users for %s: %d", si->mtxname, si->kqueue_users);
|
|
NMG_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Callback triggered by netmap notifications (see netmap_notify()),
|
|
* and by the application calling kevent(). In the former case we
|
|
* just return 1 (events ready), since we are not able to do better.
|
|
* In the latter case we use netmap_poll() to see which events are
|
|
* ready.
|
|
*/
|
|
static int
|
|
netmap_knrw(struct knote *kn, long hint, int events)
|
|
{
|
|
struct netmap_priv_d *priv;
|
|
int revents;
|
|
|
|
if (hint != 0) {
|
|
/* Called from netmap_notify(), typically from a
|
|
* thread different from the one issuing kevent().
|
|
* Assume we are ready. */
|
|
return 1;
|
|
}
|
|
|
|
/* Called from kevent(). */
|
|
priv = kn->kn_hook;
|
|
revents = netmap_poll(priv, events, /*thread=*/NULL);
|
|
|
|
return (events & revents) ? 1 : 0;
|
|
}
|
|
|
|
static int
|
|
netmap_knread(struct knote *kn, long hint)
|
|
{
|
|
return netmap_knrw(kn, hint, POLLIN);
|
|
}
|
|
|
|
static int
|
|
netmap_knwrite(struct knote *kn, long hint)
|
|
{
|
|
return netmap_knrw(kn, hint, POLLOUT);
|
|
}
|
|
|
|
static struct filterops netmap_rfiltops = {
|
|
.f_isfd = 1,
|
|
.f_detach = netmap_knrdetach,
|
|
.f_event = netmap_knread,
|
|
};
|
|
|
|
static struct filterops netmap_wfiltops = {
|
|
.f_isfd = 1,
|
|
.f_detach = netmap_knwdetach,
|
|
.f_event = netmap_knwrite,
|
|
};
|
|
|
|
|
|
/*
|
|
* This is called when a thread invokes kevent() to record
|
|
* a change in the configuration of the kqueue().
|
|
* The 'priv' is the one associated to the open netmap device.
|
|
*/
|
|
static int
|
|
netmap_kqfilter(struct cdev *dev, struct knote *kn)
|
|
{
|
|
struct netmap_priv_d *priv;
|
|
int error;
|
|
struct netmap_adapter *na;
|
|
struct nm_selinfo *si;
|
|
int ev = kn->kn_filter;
|
|
|
|
if (ev != EVFILT_READ && ev != EVFILT_WRITE) {
|
|
nm_prerr("bad filter request %d", ev);
|
|
return 1;
|
|
}
|
|
error = devfs_get_cdevpriv((void**)&priv);
|
|
if (error) {
|
|
nm_prerr("device not yet setup");
|
|
return 1;
|
|
}
|
|
na = priv->np_na;
|
|
if (na == NULL) {
|
|
nm_prerr("no netmap adapter for this file descriptor");
|
|
return 1;
|
|
}
|
|
/* the si is indicated in the priv */
|
|
si = priv->np_si[(ev == EVFILT_WRITE) ? NR_TX : NR_RX];
|
|
kn->kn_fop = (ev == EVFILT_WRITE) ?
|
|
&netmap_wfiltops : &netmap_rfiltops;
|
|
kn->kn_hook = priv;
|
|
NMG_LOCK();
|
|
si->kqueue_users++;
|
|
nm_prinf("kqueue users for %s: %d", si->mtxname, si->kqueue_users);
|
|
NMG_UNLOCK();
|
|
knlist_add(&si->si.si_note, kn, /*islocked=*/0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
freebsd_netmap_poll(struct cdev *cdevi __unused, int events, struct thread *td)
|
|
{
|
|
struct netmap_priv_d *priv;
|
|
if (devfs_get_cdevpriv((void **)&priv)) {
|
|
return POLLERR;
|
|
}
|
|
return netmap_poll(priv, events, td);
|
|
}
|
|
|
|
static int
|
|
freebsd_netmap_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
|
|
int ffla __unused, struct thread *td)
|
|
{
|
|
int error;
|
|
struct netmap_priv_d *priv;
|
|
|
|
CURVNET_SET(TD_TO_VNET(td));
|
|
error = devfs_get_cdevpriv((void **)&priv);
|
|
if (error) {
|
|
/* XXX ENOENT should be impossible, since the priv
|
|
* is now created in the open */
|
|
if (error == ENOENT)
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
error = netmap_ioctl(priv, cmd, data, td, /*nr_body_is_user=*/1);
|
|
out:
|
|
CURVNET_RESTORE();
|
|
|
|
return error;
|
|
}
|
|
|
|
void
|
|
nm_os_onattach(if_t ifp)
|
|
{
|
|
if_setcapabilitiesbit(ifp, IFCAP_NETMAP, 0);
|
|
}
|
|
|
|
void
|
|
nm_os_onenter(if_t ifp)
|
|
{
|
|
struct netmap_adapter *na = NA(ifp);
|
|
|
|
na->if_transmit = if_gettransmitfn(ifp);
|
|
if_settransmitfn(ifp, netmap_transmit);
|
|
if_setcapenablebit(ifp, IFCAP_NETMAP, 0);
|
|
}
|
|
|
|
void
|
|
nm_os_onexit(if_t ifp)
|
|
{
|
|
struct netmap_adapter *na = NA(ifp);
|
|
|
|
if_settransmitfn(ifp, na->if_transmit);
|
|
if_setcapenablebit(ifp, 0, IFCAP_NETMAP);
|
|
}
|
|
|
|
extern struct cdevsw netmap_cdevsw; /* XXX used in netmap.c, should go elsewhere */
|
|
struct cdevsw netmap_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_name = "netmap",
|
|
.d_open = netmap_open,
|
|
.d_mmap_single = netmap_mmap_single,
|
|
.d_ioctl = freebsd_netmap_ioctl,
|
|
.d_poll = freebsd_netmap_poll,
|
|
.d_kqfilter = netmap_kqfilter,
|
|
.d_close = netmap_close,
|
|
};
|
|
/*--- end of kqueue support ----*/
|
|
|
|
/*
|
|
* Kernel entry point.
|
|
*
|
|
* Initialize/finalize the module and return.
|
|
*
|
|
* Return 0 on success, errno on failure.
|
|
*/
|
|
static int
|
|
netmap_loader(__unused struct module *module, int event, __unused void *arg)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
error = netmap_init();
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
/*
|
|
* if some one is still using netmap,
|
|
* then the module can not be unloaded.
|
|
*/
|
|
if (netmap_use_count) {
|
|
nm_prerr("netmap module can not be unloaded - netmap_use_count: %d",
|
|
netmap_use_count);
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
netmap_fini();
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef DEV_MODULE_ORDERED
|
|
/*
|
|
* The netmap module contains three drivers: (i) the netmap character device
|
|
* driver; (ii) the ptnetmap memdev PCI device driver, (iii) the ptnet PCI
|
|
* device driver. The attach() routines of both (ii) and (iii) need the
|
|
* lock of the global allocator, and such lock is initialized in netmap_init(),
|
|
* which is part of (i).
|
|
* Therefore, we make sure that (i) is loaded before (ii) and (iii), using
|
|
* the 'order' parameter of driver declaration macros. For (i), we specify
|
|
* SI_ORDER_MIDDLE, while higher orders are used with the DRIVER_MODULE_ORDERED
|
|
* macros for (ii) and (iii).
|
|
*/
|
|
DEV_MODULE_ORDERED(netmap, netmap_loader, NULL, SI_ORDER_MIDDLE);
|
|
#else /* !DEV_MODULE_ORDERED */
|
|
DEV_MODULE(netmap, netmap_loader, NULL);
|
|
#endif /* DEV_MODULE_ORDERED */
|
|
MODULE_DEPEND(netmap, pci, 1, 1, 1);
|
|
MODULE_VERSION(netmap, 1);
|
|
/* reduce conditional code */
|
|
// linux API, use for the knlist in FreeBSD
|
|
/* use a private mutex for the knlist */
|