git: fb3c236a4b81 - stable/13 - LinuxKPI: import beginning of a new version of netdevice.h
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Date: Thu, 30 Dec 2021 19:22:44 UTC
The branch stable/13 has been updated by bz:
URL: https://cgit.FreeBSD.org/src/commit/?id=fb3c236a4b8131361f9f1688d8b2455609fb2d5d
commit fb3c236a4b8131361f9f1688d8b2455609fb2d5d
Author: Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2021-12-26 18:29:29 +0000
Commit: Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2021-12-30 18:27:31 +0000
LinuxKPI: import beginning of a new version of netdevice.h
Import a netdevice update complementing the last remaining bits of
the old ifnet derived implementation. Along add a (for now) task
based NAPI implementation.
This is the minimal set of chnages which are needed for the initial
support of wireless drivers. The NAPI implementation has an option to
still switch to "direct dispatch" as it had been used by these drivers
before not relying on a deferred context along with some printf tracing.
This has been helpful in the last weeks for debugging and will be
cleaned once we have had broader testing and are sure this is fine as-is.
Should we need a more time-sensitive or load-sensitive response
in the future we can always switch to something more sophisticated.
Sponsored by: The FreeBSD Foundation
X-Differential Revision: D33075 (abandoned without feedback a while ago)
(cherry picked from commit d105895844848ddba85d686e03e0d14c03ad4eb4)
---
.../linuxkpi/common/include/linux/netdevice.h | 240 ++++++++++-
sys/compat/linuxkpi/common/src/linux_netdev.c | 441 +++++++++++++++++++++
sys/conf/files | 2 +
sys/modules/linuxkpi/Makefile | 1 +
4 files changed, 678 insertions(+), 6 deletions(-)
diff --git a/sys/compat/linuxkpi/common/include/linux/netdevice.h b/sys/compat/linuxkpi/common/include/linux/netdevice.h
index 1de31b3fa156..f8c03f92b025 100644
--- a/sys/compat/linuxkpi/common/include/linux/netdevice.h
+++ b/sys/compat/linuxkpi/common/include/linux/netdevice.h
@@ -4,6 +4,11 @@
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2019 Mellanox Technologies, Ltd.
* All rights reserved.
+ * Copyright (c) 2020-2021 The FreeBSD Foundation
+ * Copyright (c) 2020-2021 Bjoern A. Zeeb
+ *
+ * Portions of this software were developed by Björn Zeeb
+ * under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -28,20 +33,34 @@
*
* $FreeBSD$
*/
-#ifndef _LINUX_NETDEVICE_H_
-#define _LINUX_NETDEVICE_H_
+#ifndef _LINUXKPI_LINUX_NETDEVICE_H
+#define _LINUXKPI_LINUX_NETDEVICE_H
#include <linux/types.h>
+#include <linux/netdev_features.h>
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/malloc.h>
+#include <sys/queue.h>
#include <sys/socket.h>
+#include <sys/taskqueue.h>
#include <net/if_types.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
+#include <linux/bitops.h>
+#include <linux/list.h>
+#include <linux/device.h>
#include <linux/net.h>
+#include <linux/if_ether.h>
#include <linux/notifier.h>
+#include <linux/random.h>
+#include <linux/rcupdate.h>
#ifdef VIMAGE
#define init_net *vnet0
@@ -49,13 +68,93 @@
#define init_net *((struct vnet *)0)
#endif
+struct sk_buff;
+struct net_device;
+struct wireless_dev; /* net/cfg80211.h */
+
#define MAX_ADDR_LEN 20
-#define net_device ifnet
+#define NET_NAME_UNKNOWN 0
+
+enum netdev_tx {
+ NETDEV_TX_OK = 0,
+};
+typedef enum netdev_tx netdev_tx_t;
+
+struct netdev_hw_addr {
+ struct list_head addr_list;
+ uint8_t addr[MAX_ADDR_LEN];
+};
+
+struct netdev_hw_addr_list {
+ struct list_head addr_list;
+ int count;
+};
+
+enum net_device_reg_state {
+ NETREG_DUMMY = 1,
+ NETREG_REGISTERED,
+};
+
+struct net_device_ops {
+ int (*ndo_open)(struct net_device *);
+ int (*ndo_stop)(struct net_device *);
+ int (*ndo_set_mac_address)(struct net_device *, void *);
+ netdev_tx_t (*ndo_start_xmit)(struct sk_buff *, struct net_device *);
+ void (*ndo_set_rx_mode)(struct net_device *);
+};
+
+struct net_device {
+ /* BSD specific for compat. */
+ struct ifnet bsdifp;
+
+ /* net_device fields seen publicly. */
+ /* XXX can we later make some aliases to ifnet? */
+ char name[IFNAMSIZ];
+ struct wireless_dev *ieee80211_ptr;
+ uint8_t dev_addr[ETH_ALEN];
+ struct netdev_hw_addr_list mc;
+ netdev_features_t features;
+ struct {
+ unsigned long multicast;
+
+ unsigned long rx_bytes;
+ unsigned long rx_errors;
+ unsigned long rx_packets;
+ unsigned long tx_bytes;
+ unsigned long tx_dropped;
+ unsigned long tx_errors;
+ unsigned long tx_packets;
+ } stats;
+ enum net_device_reg_state reg_state;
+ const struct ethtool_ops *ethtool_ops;
+ const struct net_device_ops *netdev_ops;
-#define rtnl_lock()
-#define rtnl_unlock()
+ bool needs_free_netdev;
+ /* Not properly typed as-of now. */
+ int flags, type;
+ int name_assign_type, needed_headroom;
+ void (*priv_destructor)(struct net_device *);
+
+ /* net_device internal. */
+ struct device dev;
+
+ /*
+ * In case we delete the net_device we need to be able to clear all
+ * NAPI consumers.
+ */
+ struct mtx napi_mtx;
+ TAILQ_HEAD(, napi_struct) napi_head;
+ struct taskqueue *napi_tq;
+
+ /* Must stay last. */
+ uint8_t drv_priv[0] __aligned(CACHE_LINE_SIZE);
+};
+
+#define SET_NETDEV_DEV(_ndev, _dev) (_ndev)->dev.parent = _dev;
+
+/* -------------------------------------------------------------------------- */
/* According to linux::ipoib_main.c. */
struct netdev_notifier_info {
struct net_device *dev;
@@ -79,4 +178,133 @@ int register_inetaddr_notifier(struct notifier_block *);
int unregister_netdevice_notifier(struct notifier_block *);
int unregister_inetaddr_notifier(struct notifier_block *);
-#endif /* _LINUX_NETDEVICE_H_ */
+/* -------------------------------------------------------------------------- */
+
+#define NAPI_POLL_WEIGHT 64 /* budget */
+
+struct napi_struct {
+ TAILQ_ENTRY(napi_struct) entry;
+
+ struct list_head rx_list;
+ struct net_device *dev;
+ int (*poll)(struct napi_struct *, int);
+ int budget;
+ int rx_count;
+
+ /*
+ * These flags mostly need to be checked/changed atomically
+ * (multiple together in some cases).
+ */
+ volatile unsigned long _flags;
+
+ /* FreeBSD internal. */
+ /* Use task for now, so we can easily switch between direct and task. */
+ struct task napi_task;
+};
+
+void linuxkpi_init_dummy_netdev(struct net_device *);
+void linuxkpi_netif_napi_add(struct net_device *, struct napi_struct *,
+ int(*napi_poll)(struct napi_struct *, int), int);
+void linuxkpi_netif_napi_del(struct napi_struct *);
+bool linuxkpi_napi_schedule_prep(struct napi_struct *);
+void linuxkpi___napi_schedule(struct napi_struct *);
+void linuxkpi_napi_schedule(struct napi_struct *);
+void linuxkpi_napi_reschedule(struct napi_struct *);
+bool linuxkpi_napi_complete_done(struct napi_struct *, int);
+bool linuxkpi_napi_complete(struct napi_struct *);
+void linuxkpi_napi_disable(struct napi_struct *);
+void linuxkpi_napi_enable(struct napi_struct *);
+void linuxkpi_napi_synchronize(struct napi_struct *);
+
+#define init_dummy_netdev(_n) \
+ linuxkpi_init_dummy_netdev(_n)
+#define netif_napi_add(_nd, _ns, _p, _b) \
+ linuxkpi_netif_napi_add(_nd, _ns, _p, _b)
+#define netif_napi_del(_n) \
+ linuxkpi_netif_napi_del(_n)
+#define napi_schedule_prep(_n) \
+ linuxkpi_napi_schedule_prep(_n)
+#define __napi_schedule(_n) \
+ linuxkpi___napi_schedule(_n)
+#define napi_schedule(_n) \
+ linuxkpi_napi_schedule(_n)
+#define napi_reschedule(_n) \
+ linuxkpi_napi_reschedule(_n)
+#define napi_complete_done(_n, _r) \
+ linuxkpi_napi_complete_done(_n, _r)
+#define napi_complete(_n) \
+ linuxkpi_napi_complete(_n)
+#define napi_disable(_n) \
+ linuxkpi_napi_disable(_n)
+#define napi_enable(_n) \
+ linuxkpi_napi_enable(_n)
+#define napi_synchronize(_n) \
+ linuxkpi_napi_synchronize(_n)
+
+/* -------------------------------------------------------------------------- */
+
+static inline void
+netdev_rss_key_fill(uint32_t *buf, size_t len)
+{
+
+ /*
+ * Remembering from a previous life there was discussions on what is
+ * a good RSS hash key. See end of rss_init() in net/rss_config.c.
+ * iwlwifi is looking for a 10byte "secret" so stay with random for now.
+ */
+ get_random_bytes(buf, len);
+}
+
+static inline int
+netdev_hw_addr_list_count(struct netdev_hw_addr_list *list)
+{
+
+ return (list->count);
+}
+
+static inline int
+netdev_mc_count(struct net_device *ndev)
+{
+
+ return (netdev_hw_addr_list_count(&ndev->mc));
+}
+
+#define netdev_hw_addr_list_for_each(_addr, _list) \
+ list_for_each_entry((_addr), &(_list)->addr_list, addr_list)
+
+#define netdev_for_each_mc_addr(na, ndev) \
+ netdev_hw_addr_list_for_each(na, &(ndev)->mc)
+
+static __inline void
+synchronize_net(void)
+{
+
+ /* We probably cannot do that unconditionally at some point anymore. */
+ synchronize_rcu();
+}
+
+/* -------------------------------------------------------------------------- */
+
+struct net_device *linuxkpi_alloc_netdev(size_t, const char *, uint32_t,
+ void(*)(struct net_device *));
+void linuxkpi_free_netdev(struct net_device *);
+
+#define alloc_netdev(_l, _n, _f, _func) \
+ linuxkpi_alloc_netdev(_l, _n, _f, _func)
+#define free_netdev(_n) \
+ linuxkpi_free_netdev(_n)
+
+static inline void *
+netdev_priv(const struct net_device *ndev)
+{
+
+ return (__DECONST(void *, ndev->drv_priv));
+}
+
+/* -------------------------------------------------------------------------- */
+/* This is really rtnetlink and probably belongs elsewhere. */
+
+#define rtnl_lock() do { } while(0)
+#define rtnl_unlock() do { } while(0)
+
+#endif /* _LINUXKPI_LINUX_NETDEVICE_H */
diff --git a/sys/compat/linuxkpi/common/src/linux_netdev.c b/sys/compat/linuxkpi/common/src/linux_netdev.c
new file mode 100644
index 000000000000..27e29b40ea44
--- /dev/null
+++ b/sys/compat/linuxkpi/common/src/linux_netdev.c
@@ -0,0 +1,441 @@
+/*-
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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/types.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+
+#include <linux/bitops.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+
+MALLOC_DEFINE(M_NETDEV, "lkpindev", "Linux KPI netdevice compat");
+
+#define NAPI_LOCK_INIT(_ndev) \
+ mtx_init(&(_ndev)->napi_mtx, "napi_mtx", NULL, MTX_DEF)
+#define NAPI_LOCK_DESTROY(_ndev) mtx_destroy(&(_ndev)->napi_mtx)
+#define NAPI_LOCK_ASSERT(_ndev) mtx_assert(&(_ndev)->napi_mtx, MA_OWNED)
+#define NAPI_LOCK(_ndev) mtx_lock(&(_ndev)->napi_mtx)
+#define NAPI_UNLOCK(_ndev) mtx_unlock(&(_ndev)->napi_mtx)
+
+/* -------------------------------------------------------------------------- */
+/* Do not schedule new things while we are waiting to clear things. */
+#define LKPI_NAPI_FLAG_DISABLE_PENDING 0
+/* To synchronise that only one poll is ever running. */
+#define LKPI_NAPI_FLAG_IS_SCHEDULED 1
+/* If trying to schedule while poll is running. Need to re-schedule. */
+#define LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN 2
+/* When shutting down forcefully prevent anything from running task/poll. */
+#define LKPI_NAPI_FLAG_SHUTDOWN 3
+
+#define LKPI_NAPI_FLAGS \
+ "\20\1DISABLE_PENDING\2IS_SCHEDULED\3LOST_RACE_TRY_AGAIN"
+
+/* #define NAPI_DEBUG */
+#ifdef NAPI_DEBUG
+static int debug_napi;
+SYSCTL_INT(_compat_linuxkpi, OID_AUTO, debug_napi, CTLFLAG_RWTUN,
+ &debug_napi, 0, "NAPI debug level");
+
+#define DNAPI_TODO 0x01
+#define DNAPI_IMPROVE 0x02
+#define DNAPI_TRACE 0x10
+#define DNAPI_TRACE_TASK 0x20
+#define DNAPI_DIRECT_DISPATCH 0x1000
+
+#define NAPI_TRACE(_n) if (debug_napi & DNAPI_TRACE) \
+ printf("NAPI_TRACE %s:%d %u %p (%#jx %b)\n", __func__, __LINE__, \
+ (unsigned int)ticks, _n, (uintmax_t)(_n)->_flags, \
+ (int)(_n)->_flags, LKPI_NAPI_FLAGS)
+#define NAPI_TRACE2D(_n, _d) if (debug_napi & DNAPI_TRACE) \
+ printf("NAPI_TRACE %s:%d %u %p (%#jx %b) %d\n", __func__, __LINE__, \
+ (unsigned int)ticks, _n, (uintmax_t)(_n)->_flags, \
+ (int)(_n)->_flags, LKPI_NAPI_FLAGS, _d)
+#define NAPI_TRACE_TASK(_n, _p, _c) if (debug_napi & DNAPI_TRACE_TASK) \
+ printf("NAPI_TRACE %s:%d %u %p (%#jx %b) pending %d count %d " \
+ "rx_count %d\n", __func__, __LINE__, \
+ (unsigned int)ticks, _n, (uintmax_t)(_n)->_flags, \
+ (int)(_n)->_flags, LKPI_NAPI_FLAGS, _p, _c, (_n)->rx_count)
+#define NAPI_TODO() if (debug_napi & DNAPI_TODO) \
+ printf("NAPI_TODO %s:%d %d\n", __func__, __LINE__, ticks)
+#define NAPI_IMPROVE() if (debug_napi & DNAPI_IMPROVE) \
+ printf("NAPI_IMPROVE %s:%d %d\n", __func__, __LINE__, ticks)
+
+#define NAPI_DIRECT_DISPATCH() ((debug_napi & DNAPI_DIRECT_DISPATCH) != 0)
+#else
+#define NAPI_TRACE(_n) do { } while(0)
+#define NAPI_TRACE2D(_n, _d) do { } while(0)
+#define NAPI_TRACE_TASK(_n, _p, _c) do { } while(0)
+#define NAPI_TODO() do { } while(0)
+#define NAPI_IMPROVE() do { } while(0)
+
+#define NAPI_DIRECT_DISPATCH() (0)
+#endif
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Check if a poll is running or can run and and if the latter
+ * make us as running. That way we ensure that only one poll
+ * can only ever run at the same time. Returns true if no poll
+ * was scheduled yet.
+ */
+bool
+linuxkpi_napi_schedule_prep(struct napi_struct *napi)
+{
+ unsigned long old, new;
+
+ NAPI_TRACE(napi);
+
+ /* Can can only update/return if all flags agree. */
+ do {
+ old = READ_ONCE(napi->_flags);
+
+ /* If we are stopping, cannot run again. */
+ if ((old & BIT(LKPI_NAPI_FLAG_DISABLE_PENDING)) != 0) {
+ NAPI_TRACE(napi);
+ return (false);
+ }
+
+ new = old;
+ /* We were already scheduled. Need to try again? */
+ if ((old & BIT(LKPI_NAPI_FLAG_IS_SCHEDULED)) != 0)
+ new |= BIT(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN);
+ new |= BIT(LKPI_NAPI_FLAG_IS_SCHEDULED);
+
+ } while (atomic_cmpset_acq_long(&napi->_flags, old, new) == 0);
+
+ NAPI_TRACE(napi);
+ return ((old & BIT(LKPI_NAPI_FLAG_IS_SCHEDULED)) == 0);
+}
+
+static void
+lkpi___napi_schedule_dd(struct napi_struct *napi)
+{
+ unsigned long old, new;
+ int rc;
+
+ rc = 0;
+again:
+ NAPI_TRACE2D(napi, rc);
+ if (napi->poll != NULL)
+ rc = napi->poll(napi, napi->budget);
+ napi->rx_count += rc;
+
+ /* Check if interrupts are still disabled, more work to do. */
+ /* Bandaid for now. */
+ if (rc >= napi->budget)
+ goto again;
+
+ /* Bandaid for now. */
+ if (test_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &napi->_flags))
+ goto again;
+
+ do {
+ new = old = READ_ONCE(napi->_flags);
+ clear_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &new);
+ clear_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &new);
+ } while (atomic_cmpset_acq_long(&napi->_flags, old, new) == 0);
+
+ NAPI_TRACE2D(napi, rc);
+}
+
+void
+linuxkpi___napi_schedule(struct napi_struct *napi)
+{
+ int rc;
+
+ NAPI_TRACE(napi);
+ if (test_bit(LKPI_NAPI_FLAG_SHUTDOWN, &napi->_flags)) {
+ clear_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &napi->_flags);
+ clear_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &napi->_flags);
+ NAPI_TRACE(napi);
+ return;
+ }
+
+ if (NAPI_DIRECT_DISPATCH()) {
+ lkpi___napi_schedule_dd(napi);
+ } else {
+ rc = taskqueue_enqueue(napi->dev->napi_tq, &napi->napi_task);
+ NAPI_TRACE2D(napi, rc);
+ if (rc != 0) {
+ /* Should we assert EPIPE? */
+ return;
+ }
+ }
+}
+
+void
+linuxkpi_napi_schedule(struct napi_struct *napi)
+{
+
+ NAPI_TRACE(napi);
+
+ /*
+ * iwlwifi calls this sequence instead of napi_schedule()
+ * to be able to test the prep result.
+ */
+ if (napi_schedule_prep(napi))
+ __napi_schedule(napi);
+}
+
+void
+linuxkpi_napi_reschedule(struct napi_struct *napi)
+{
+
+ NAPI_TRACE(napi);
+
+ /* Not sure what is different to napi_schedule yet. */
+ if (napi_schedule_prep(napi))
+ __napi_schedule(napi);
+}
+
+bool
+linuxkpi_napi_complete_done(struct napi_struct *napi, int ret)
+{
+ unsigned long old, new;
+
+ NAPI_TRACE(napi);
+ if (NAPI_DIRECT_DISPATCH())
+ return (true);
+
+ do {
+ new = old = READ_ONCE(napi->_flags);
+
+ /*
+ * If we lost a race before, we need to re-schedule.
+ * Leave IS_SCHEDULED set essentially doing "_prep".
+ */
+ if (!test_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &old))
+ clear_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &new);
+ clear_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &new);
+ } while (atomic_cmpset_acq_long(&napi->_flags, old, new) == 0);
+
+ NAPI_TRACE(napi);
+
+ /* Someone tried to schedule while poll was running. Re-sched. */
+ if (test_bit(LKPI_NAPI_FLAG_LOST_RACE_TRY_AGAIN, &old)) {
+ __napi_schedule(napi);
+ return (false);
+ }
+
+ return (true);
+}
+
+bool
+linuxkpi_napi_complete(struct napi_struct *napi)
+{
+
+ NAPI_TRACE(napi);
+ return (napi_complete_done(napi, 0));
+}
+
+void
+linuxkpi_napi_disable(struct napi_struct *napi)
+{
+ NAPI_TRACE(napi);
+ set_bit(LKPI_NAPI_FLAG_DISABLE_PENDING, &napi->_flags);
+ while (test_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &napi->_flags))
+ pause_sbt("napidslp", SBT_1MS, 0, C_HARDCLOCK);
+ clear_bit(LKPI_NAPI_FLAG_DISABLE_PENDING, &napi->_flags);
+}
+
+void
+linuxkpi_napi_enable(struct napi_struct *napi)
+{
+
+ NAPI_TRACE(napi);
+ KASSERT(!test_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &napi->_flags),
+ ("%s: enabling napi %p already scheduled\n", __func__, napi));
+ mb();
+ /* Let us be scheduled. */
+ clear_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &napi->_flags);
+}
+
+void
+linuxkpi_napi_synchronize(struct napi_struct *napi)
+{
+ NAPI_TRACE(napi);
+#if defined(SMP)
+ /* Check & sleep while a napi is scheduled. */
+ while (test_bit(LKPI_NAPI_FLAG_IS_SCHEDULED, &napi->_flags))
+ pause_sbt("napisslp", SBT_1MS, 0, C_HARDCLOCK);
+#else
+ mb();
+#endif
+}
+
+/* -------------------------------------------------------------------------- */
+
+static void
+lkpi_napi_task(void *ctx, int pending)
+{
+ struct napi_struct *napi;
+ int count;
+
+ KASSERT(ctx != NULL, ("%s: napi %p, pending %d\n",
+ __func__, ctx, pending));
+ napi = ctx;
+ KASSERT(napi->poll != NULL, ("%s: napi %p poll is NULL\n",
+ __func__, napi));
+
+ NAPI_TRACE_TASK(napi, pending, napi->budget);
+ count = napi->poll(napi, napi->budget);
+ napi->rx_count += count;
+ NAPI_TRACE_TASK(napi, pending, count);
+
+ /*
+ * We must not check against count < pending here. There are situations
+ * when a driver may "poll" and we may not have any work to do and that
+ * would make us re-schedule ourseless for ever.
+ */
+ if (count >= napi->budget) {
+ /*
+ * Have to re-schedule ourselves. napi_complete() was not run
+ * in this case which means we are still SCHEDULED.
+ * In order to queue another task we have to directly call
+ * __napi_schedule() without _prep() in the way.
+ */
+ __napi_schedule(napi);
+ }
+}
+
+/* -------------------------------------------------------------------------- */
+
+void
+linuxkpi_netif_napi_add(struct net_device *ndev, struct napi_struct *napi,
+ int(*napi_poll)(struct napi_struct *, int), int budget)
+{
+
+ napi->dev = ndev;
+ napi->poll = napi_poll;
+ napi->budget = budget;
+
+ INIT_LIST_HEAD(&napi->rx_list);
+ napi->rx_count = 0;
+
+ TASK_INIT(&napi->napi_task, 0, lkpi_napi_task, napi);
+
+ NAPI_LOCK(ndev);
+ TAILQ_INSERT_TAIL(&ndev->napi_head, napi, entry);
+ NAPI_UNLOCK(ndev);
+
+ /* Anything else to do on the ndev? */
+ clear_bit(LKPI_NAPI_FLAG_SHUTDOWN, &napi->_flags);
+}
+
+static void
+lkpi_netif_napi_del_locked(struct napi_struct *napi)
+{
+ struct net_device *ndev;
+
+ ndev = napi->dev;
+ NAPI_LOCK_ASSERT(ndev);
+
+ set_bit(LKPI_NAPI_FLAG_SHUTDOWN, &napi->_flags);
+ TAILQ_REMOVE(&ndev->napi_head, napi, entry);
+ while (taskqueue_cancel(ndev->napi_tq, &napi->napi_task, NULL) != 0)
+ taskqueue_drain(ndev->napi_tq, &napi->napi_task);
+}
+
+void
+linuxkpi_netif_napi_del(struct napi_struct *napi)
+{
+ struct net_device *ndev;
+
+ ndev = napi->dev;
+ NAPI_LOCK(ndev);
+ lkpi_netif_napi_del_locked(napi);
+ NAPI_UNLOCK(ndev);
+}
+
+/* -------------------------------------------------------------------------- */
+
+void
+linuxkpi_init_dummy_netdev(struct net_device *ndev)
+{
+
+ memset(ndev, 0, sizeof(*ndev));
+
+ ndev->reg_state = NETREG_DUMMY;
+ NAPI_LOCK_INIT(ndev);
+ TAILQ_INIT(&ndev->napi_head);
+ /* Anything else? */
+
+ ndev->napi_tq = taskqueue_create("tq_ndev_napi", M_WAITOK,
+ taskqueue_thread_enqueue, &ndev->napi_tq);
+ /* One thread for now. */
+ (void) taskqueue_start_threads(&ndev->napi_tq, 1, PWAIT,
+ "ndev napi taskq");
+}
+
+struct net_device *
+linuxkpi_alloc_netdev(size_t len, const char *name, uint32_t flags,
+ void(*setup_func)(struct net_device *))
+{
+ struct net_device *ndev;
+
+ ndev = malloc(sizeof(*ndev) + len, M_NETDEV, M_NOWAIT);
+ if (ndev == NULL)
+ return (ndev);
+
+ /* Always first as it zeros! */
+ linuxkpi_init_dummy_netdev(ndev);
+
+ strlcpy(ndev->name, name, sizeof(*ndev->name));
+
+ /* This needs extending as we support more. */
+
+ setup_func(ndev);
+
+ return (ndev);
+}
+
+void
+linuxkpi_free_netdev(struct net_device *ndev)
+{
+ struct napi_struct *napi, *temp;
+
+ NAPI_LOCK(ndev);
+ TAILQ_FOREACH_SAFE(napi, &ndev->napi_head, entry, temp) {
+ lkpi_netif_napi_del_locked(napi);
+ }
+ NAPI_UNLOCK(ndev);
+
+ taskqueue_free(ndev->napi_tq);
+ ndev->napi_tq = NULL;
+ NAPI_LOCK_DESTROY(ndev);
+
+ /* This needs extending as we support more. */
+
+ free(ndev, M_NETDEV);
+}
diff --git a/sys/conf/files b/sys/conf/files
index 00ae10cf0e6e..080c26d24d6d 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -4602,6 +4602,8 @@ compat/linuxkpi/common/src/linux_kthread.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_lock.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
+compat/linuxkpi/common/src/linux_netdev.c optional compat_linuxkpi \
+ compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_page.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_pci.c optional compat_linuxkpi pci \
diff --git a/sys/modules/linuxkpi/Makefile b/sys/modules/linuxkpi/Makefile
index d73d8ee9c9a9..468abcdc229f 100644
--- a/sys/modules/linuxkpi/Makefile
+++ b/sys/modules/linuxkpi/Makefile
@@ -14,6 +14,7 @@ SRCS= linux_compat.c \
linux_kmod.c \
linux_kthread.c \
linux_lock.c \
+ linux_netdev.c \
linux_page.c \
linux_pci.c \
linux_radix.c \