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![Wei Liu](/assets/img/avatar_default.png)
Interrupt is enabled when bind_interdomain_evtchn_to_irqhandler returns.
If there's interrupt pending interrupt handler is invoked.
NAPI needs to be initialised before binding interrupt otherwise the
interrupt handler will try to scheduling a NAPI instance that is not
initialised yet, resulting in kernel OOPS.
This fixes a regression introduced in ea2c5e13
("xen-netback: move NAPI
add/remove calls").
Ideally function calls to create kthreads should also be moved before
binding but I intent to fix this regression with minimal changes and
refactor the code with another patch.
Reported-by: Thomas Leonard <talex5@gmail.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
730 lines
19 KiB
C
730 lines
19 KiB
C
/*
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* Network-device interface management.
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*
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* Copyright (c) 2004-2005, Keir Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "common.h"
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#include <linux/kthread.h>
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_vlan.h>
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#include <linux/vmalloc.h>
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#include <xen/events.h>
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#include <asm/xen/hypercall.h>
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#include <xen/balloon.h>
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#define XENVIF_QUEUE_LENGTH 32
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#define XENVIF_NAPI_WEIGHT 64
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/* This function is used to set SKBTX_DEV_ZEROCOPY as well as
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* increasing the inflight counter. We need to increase the inflight
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* counter because core driver calls into xenvif_zerocopy_callback
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* which calls xenvif_skb_zerocopy_complete.
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*/
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void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
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struct sk_buff *skb)
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{
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skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
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atomic_inc(&queue->inflight_packets);
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}
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void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
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{
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atomic_dec(&queue->inflight_packets);
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}
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static inline void xenvif_stop_queue(struct xenvif_queue *queue)
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{
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struct net_device *dev = queue->vif->dev;
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if (!queue->vif->can_queue)
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return;
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netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
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}
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int xenvif_schedulable(struct xenvif *vif)
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{
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return netif_running(vif->dev) &&
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test_bit(VIF_STATUS_CONNECTED, &vif->status);
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}
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static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
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{
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struct xenvif_queue *queue = dev_id;
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if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))
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napi_schedule(&queue->napi);
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return IRQ_HANDLED;
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}
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int xenvif_poll(struct napi_struct *napi, int budget)
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{
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struct xenvif_queue *queue =
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container_of(napi, struct xenvif_queue, napi);
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int work_done;
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/* This vif is rogue, we pretend we've there is nothing to do
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* for this vif to deschedule it from NAPI. But this interface
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* will be turned off in thread context later.
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*/
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if (unlikely(queue->vif->disabled)) {
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napi_complete(napi);
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return 0;
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}
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work_done = xenvif_tx_action(queue, budget);
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if (work_done < budget) {
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napi_complete(napi);
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xenvif_napi_schedule_or_enable_events(queue);
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}
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return work_done;
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}
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static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
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{
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struct xenvif_queue *queue = dev_id;
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struct netdev_queue *net_queue =
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netdev_get_tx_queue(queue->vif->dev, queue->id);
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/* QUEUE_STATUS_RX_PURGE_EVENT is only set if either QDisc was off OR
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* the carrier went down and this queue was previously blocked
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*/
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if (unlikely(netif_tx_queue_stopped(net_queue) ||
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(!netif_carrier_ok(queue->vif->dev) &&
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test_bit(QUEUE_STATUS_RX_STALLED, &queue->status))))
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set_bit(QUEUE_STATUS_RX_PURGE_EVENT, &queue->status);
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xenvif_kick_thread(queue);
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return IRQ_HANDLED;
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}
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irqreturn_t xenvif_interrupt(int irq, void *dev_id)
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{
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xenvif_tx_interrupt(irq, dev_id);
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xenvif_rx_interrupt(irq, dev_id);
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return IRQ_HANDLED;
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}
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int xenvif_queue_stopped(struct xenvif_queue *queue)
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{
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struct net_device *dev = queue->vif->dev;
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unsigned int id = queue->id;
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return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id));
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}
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void xenvif_wake_queue(struct xenvif_queue *queue)
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{
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struct net_device *dev = queue->vif->dev;
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unsigned int id = queue->id;
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netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
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}
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/* Callback to wake the queue's thread and turn the carrier off on timeout */
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static void xenvif_rx_stalled(unsigned long data)
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{
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struct xenvif_queue *queue = (struct xenvif_queue *)data;
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if (xenvif_queue_stopped(queue)) {
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set_bit(QUEUE_STATUS_RX_PURGE_EVENT, &queue->status);
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xenvif_kick_thread(queue);
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}
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}
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static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = vif->num_queues;
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u16 index;
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int min_slots_needed;
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BUG_ON(skb->dev != dev);
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/* Drop the packet if queues are not set up */
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if (num_queues < 1)
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goto drop;
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/* Obtain the queue to be used to transmit this packet */
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index = skb_get_queue_mapping(skb);
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if (index >= num_queues) {
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pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.",
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index, vif->dev->name);
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index %= num_queues;
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}
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queue = &vif->queues[index];
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/* Drop the packet if queue is not ready */
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if (queue->task == NULL ||
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queue->dealloc_task == NULL ||
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!xenvif_schedulable(vif))
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goto drop;
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/* At best we'll need one slot for the header and one for each
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* frag.
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*/
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min_slots_needed = 1 + skb_shinfo(skb)->nr_frags;
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/* If the skb is GSO then we'll also need an extra slot for the
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* metadata.
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*/
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if (skb_is_gso(skb))
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min_slots_needed++;
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/* If the skb can't possibly fit in the remaining slots
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* then turn off the queue to give the ring a chance to
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* drain.
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*/
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if (!xenvif_rx_ring_slots_available(queue, min_slots_needed)) {
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queue->rx_stalled.function = xenvif_rx_stalled;
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queue->rx_stalled.data = (unsigned long)queue;
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xenvif_stop_queue(queue);
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mod_timer(&queue->rx_stalled,
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jiffies + rx_drain_timeout_jiffies);
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}
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skb_queue_tail(&queue->rx_queue, skb);
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xenvif_kick_thread(queue);
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return NETDEV_TX_OK;
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drop:
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vif->dev->stats.tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = vif->num_queues;
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unsigned long rx_bytes = 0;
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unsigned long rx_packets = 0;
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unsigned long tx_bytes = 0;
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unsigned long tx_packets = 0;
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unsigned int index;
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if (vif->queues == NULL)
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goto out;
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/* Aggregate tx and rx stats from each queue */
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for (index = 0; index < num_queues; ++index) {
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queue = &vif->queues[index];
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rx_bytes += queue->stats.rx_bytes;
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rx_packets += queue->stats.rx_packets;
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tx_bytes += queue->stats.tx_bytes;
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tx_packets += queue->stats.tx_packets;
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}
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out:
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vif->dev->stats.rx_bytes = rx_bytes;
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vif->dev->stats.rx_packets = rx_packets;
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vif->dev->stats.tx_bytes = tx_bytes;
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vif->dev->stats.tx_packets = tx_packets;
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return &vif->dev->stats;
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}
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static void xenvif_up(struct xenvif *vif)
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{
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = vif->num_queues;
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unsigned int queue_index;
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for (queue_index = 0; queue_index < num_queues; ++queue_index) {
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queue = &vif->queues[queue_index];
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napi_enable(&queue->napi);
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enable_irq(queue->tx_irq);
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if (queue->tx_irq != queue->rx_irq)
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enable_irq(queue->rx_irq);
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xenvif_napi_schedule_or_enable_events(queue);
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}
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}
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static void xenvif_down(struct xenvif *vif)
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{
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = vif->num_queues;
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unsigned int queue_index;
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for (queue_index = 0; queue_index < num_queues; ++queue_index) {
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queue = &vif->queues[queue_index];
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napi_disable(&queue->napi);
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disable_irq(queue->tx_irq);
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if (queue->tx_irq != queue->rx_irq)
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disable_irq(queue->rx_irq);
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del_timer_sync(&queue->credit_timeout);
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}
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}
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static int xenvif_open(struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
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xenvif_up(vif);
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netif_tx_start_all_queues(dev);
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return 0;
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}
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static int xenvif_close(struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
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xenvif_down(vif);
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netif_tx_stop_all_queues(dev);
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return 0;
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}
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static int xenvif_change_mtu(struct net_device *dev, int mtu)
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{
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struct xenvif *vif = netdev_priv(dev);
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int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
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if (mtu > max)
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return -EINVAL;
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dev->mtu = mtu;
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return 0;
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}
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static netdev_features_t xenvif_fix_features(struct net_device *dev,
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netdev_features_t features)
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{
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struct xenvif *vif = netdev_priv(dev);
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if (!vif->can_sg)
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features &= ~NETIF_F_SG;
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if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4))
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features &= ~NETIF_F_TSO;
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if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6))
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features &= ~NETIF_F_TSO6;
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if (!vif->ip_csum)
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features &= ~NETIF_F_IP_CSUM;
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if (!vif->ipv6_csum)
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features &= ~NETIF_F_IPV6_CSUM;
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return features;
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}
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static const struct xenvif_stat {
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char name[ETH_GSTRING_LEN];
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u16 offset;
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} xenvif_stats[] = {
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{
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"rx_gso_checksum_fixup",
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offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
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},
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/* If (sent != success + fail), there are probably packets never
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* freed up properly!
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*/
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{
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"tx_zerocopy_sent",
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offsetof(struct xenvif_stats, tx_zerocopy_sent),
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},
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{
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"tx_zerocopy_success",
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offsetof(struct xenvif_stats, tx_zerocopy_success),
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},
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{
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"tx_zerocopy_fail",
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offsetof(struct xenvif_stats, tx_zerocopy_fail)
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},
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/* Number of packets exceeding MAX_SKB_FRAG slots. You should use
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* a guest with the same MAX_SKB_FRAG
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*/
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{
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"tx_frag_overflow",
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offsetof(struct xenvif_stats, tx_frag_overflow)
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},
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};
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static int xenvif_get_sset_count(struct net_device *dev, int string_set)
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{
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switch (string_set) {
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case ETH_SS_STATS:
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return ARRAY_SIZE(xenvif_stats);
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default:
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return -EINVAL;
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}
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}
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static void xenvif_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats, u64 * data)
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{
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struct xenvif *vif = netdev_priv(dev);
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unsigned int num_queues = vif->num_queues;
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int i;
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unsigned int queue_index;
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struct xenvif_stats *vif_stats;
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for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
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unsigned long accum = 0;
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for (queue_index = 0; queue_index < num_queues; ++queue_index) {
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vif_stats = &vif->queues[queue_index].stats;
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accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
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}
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data[i] = accum;
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}
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}
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static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
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{
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int i;
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switch (stringset) {
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case ETH_SS_STATS:
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for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
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memcpy(data + i * ETH_GSTRING_LEN,
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xenvif_stats[i].name, ETH_GSTRING_LEN);
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break;
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}
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}
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static const struct ethtool_ops xenvif_ethtool_ops = {
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.get_link = ethtool_op_get_link,
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.get_sset_count = xenvif_get_sset_count,
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.get_ethtool_stats = xenvif_get_ethtool_stats,
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.get_strings = xenvif_get_strings,
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};
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static const struct net_device_ops xenvif_netdev_ops = {
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.ndo_start_xmit = xenvif_start_xmit,
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.ndo_get_stats = xenvif_get_stats,
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.ndo_open = xenvif_open,
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.ndo_stop = xenvif_close,
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.ndo_change_mtu = xenvif_change_mtu,
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.ndo_fix_features = xenvif_fix_features,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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};
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struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
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unsigned int handle)
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{
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int err;
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struct net_device *dev;
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struct xenvif *vif;
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char name[IFNAMSIZ] = {};
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snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
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/* Allocate a netdev with the max. supported number of queues.
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* When the guest selects the desired number, it will be updated
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* via netif_set_real_num_*_queues().
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*/
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dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN,
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ether_setup, xenvif_max_queues);
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if (dev == NULL) {
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pr_warn("Could not allocate netdev for %s\n", name);
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return ERR_PTR(-ENOMEM);
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}
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SET_NETDEV_DEV(dev, parent);
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vif = netdev_priv(dev);
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vif->domid = domid;
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vif->handle = handle;
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vif->can_sg = 1;
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vif->ip_csum = 1;
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vif->dev = dev;
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vif->disabled = false;
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/* Start out with no queues. */
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vif->queues = NULL;
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vif->num_queues = 0;
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dev->netdev_ops = &xenvif_netdev_ops;
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dev->hw_features = NETIF_F_SG |
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NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
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NETIF_F_TSO | NETIF_F_TSO6;
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dev->features = dev->hw_features | NETIF_F_RXCSUM;
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dev->ethtool_ops = &xenvif_ethtool_ops;
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dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
|
|
|
|
/*
|
|
* Initialise a dummy MAC address. We choose the numerically
|
|
* largest non-broadcast address to prevent the address getting
|
|
* stolen by an Ethernet bridge for STP purposes.
|
|
* (FE:FF:FF:FF:FF:FF)
|
|
*/
|
|
memset(dev->dev_addr, 0xFF, ETH_ALEN);
|
|
dev->dev_addr[0] &= ~0x01;
|
|
|
|
netif_carrier_off(dev);
|
|
|
|
err = register_netdev(dev);
|
|
if (err) {
|
|
netdev_warn(dev, "Could not register device: err=%d\n", err);
|
|
free_netdev(dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
netdev_dbg(dev, "Successfully created xenvif\n");
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
return vif;
|
|
}
|
|
|
|
int xenvif_init_queue(struct xenvif_queue *queue)
|
|
{
|
|
int err, i;
|
|
|
|
queue->credit_bytes = queue->remaining_credit = ~0UL;
|
|
queue->credit_usec = 0UL;
|
|
init_timer(&queue->credit_timeout);
|
|
queue->credit_window_start = get_jiffies_64();
|
|
|
|
skb_queue_head_init(&queue->rx_queue);
|
|
skb_queue_head_init(&queue->tx_queue);
|
|
|
|
queue->pending_cons = 0;
|
|
queue->pending_prod = MAX_PENDING_REQS;
|
|
for (i = 0; i < MAX_PENDING_REQS; ++i)
|
|
queue->pending_ring[i] = i;
|
|
|
|
spin_lock_init(&queue->callback_lock);
|
|
spin_lock_init(&queue->response_lock);
|
|
|
|
/* If ballooning is disabled, this will consume real memory, so you
|
|
* better enable it. The long term solution would be to use just a
|
|
* bunch of valid page descriptors, without dependency on ballooning
|
|
*/
|
|
err = alloc_xenballooned_pages(MAX_PENDING_REQS,
|
|
queue->mmap_pages,
|
|
false);
|
|
if (err) {
|
|
netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < MAX_PENDING_REQS; i++) {
|
|
queue->pending_tx_info[i].callback_struct = (struct ubuf_info)
|
|
{ .callback = xenvif_zerocopy_callback,
|
|
.ctx = NULL,
|
|
.desc = i };
|
|
queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
|
|
}
|
|
|
|
init_timer(&queue->rx_stalled);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void xenvif_carrier_on(struct xenvif *vif)
|
|
{
|
|
rtnl_lock();
|
|
if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
|
|
dev_set_mtu(vif->dev, ETH_DATA_LEN);
|
|
netdev_update_features(vif->dev);
|
|
set_bit(VIF_STATUS_CONNECTED, &vif->status);
|
|
netif_carrier_on(vif->dev);
|
|
if (netif_running(vif->dev))
|
|
xenvif_up(vif);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref,
|
|
unsigned long rx_ring_ref, unsigned int tx_evtchn,
|
|
unsigned int rx_evtchn)
|
|
{
|
|
struct task_struct *task;
|
|
int err = -ENOMEM;
|
|
|
|
BUG_ON(queue->tx_irq);
|
|
BUG_ON(queue->task);
|
|
BUG_ON(queue->dealloc_task);
|
|
|
|
err = xenvif_map_frontend_rings(queue, tx_ring_ref, rx_ring_ref);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
init_waitqueue_head(&queue->wq);
|
|
init_waitqueue_head(&queue->dealloc_wq);
|
|
atomic_set(&queue->inflight_packets, 0);
|
|
|
|
netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
|
|
XENVIF_NAPI_WEIGHT);
|
|
|
|
if (tx_evtchn == rx_evtchn) {
|
|
/* feature-split-event-channels == 0 */
|
|
err = bind_interdomain_evtchn_to_irqhandler(
|
|
queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
|
|
queue->name, queue);
|
|
if (err < 0)
|
|
goto err_unmap;
|
|
queue->tx_irq = queue->rx_irq = err;
|
|
disable_irq(queue->tx_irq);
|
|
} else {
|
|
/* feature-split-event-channels == 1 */
|
|
snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
|
|
"%s-tx", queue->name);
|
|
err = bind_interdomain_evtchn_to_irqhandler(
|
|
queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
|
|
queue->tx_irq_name, queue);
|
|
if (err < 0)
|
|
goto err_unmap;
|
|
queue->tx_irq = err;
|
|
disable_irq(queue->tx_irq);
|
|
|
|
snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
|
|
"%s-rx", queue->name);
|
|
err = bind_interdomain_evtchn_to_irqhandler(
|
|
queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
|
|
queue->rx_irq_name, queue);
|
|
if (err < 0)
|
|
goto err_tx_unbind;
|
|
queue->rx_irq = err;
|
|
disable_irq(queue->rx_irq);
|
|
}
|
|
|
|
task = kthread_create(xenvif_kthread_guest_rx,
|
|
(void *)queue, "%s-guest-rx", queue->name);
|
|
if (IS_ERR(task)) {
|
|
pr_warn("Could not allocate kthread for %s\n", queue->name);
|
|
err = PTR_ERR(task);
|
|
goto err_rx_unbind;
|
|
}
|
|
queue->task = task;
|
|
|
|
task = kthread_create(xenvif_dealloc_kthread,
|
|
(void *)queue, "%s-dealloc", queue->name);
|
|
if (IS_ERR(task)) {
|
|
pr_warn("Could not allocate kthread for %s\n", queue->name);
|
|
err = PTR_ERR(task);
|
|
goto err_rx_unbind;
|
|
}
|
|
queue->dealloc_task = task;
|
|
|
|
wake_up_process(queue->task);
|
|
wake_up_process(queue->dealloc_task);
|
|
|
|
return 0;
|
|
|
|
err_rx_unbind:
|
|
unbind_from_irqhandler(queue->rx_irq, queue);
|
|
queue->rx_irq = 0;
|
|
err_tx_unbind:
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
queue->tx_irq = 0;
|
|
err_unmap:
|
|
xenvif_unmap_frontend_rings(queue);
|
|
err:
|
|
module_put(THIS_MODULE);
|
|
return err;
|
|
}
|
|
|
|
void xenvif_carrier_off(struct xenvif *vif)
|
|
{
|
|
struct net_device *dev = vif->dev;
|
|
|
|
rtnl_lock();
|
|
if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) {
|
|
netif_carrier_off(dev); /* discard queued packets */
|
|
if (netif_running(dev))
|
|
xenvif_down(vif);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
void xenvif_disconnect(struct xenvif *vif)
|
|
{
|
|
struct xenvif_queue *queue = NULL;
|
|
unsigned int num_queues = vif->num_queues;
|
|
unsigned int queue_index;
|
|
|
|
xenvif_carrier_off(vif);
|
|
|
|
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
|
queue = &vif->queues[queue_index];
|
|
|
|
netif_napi_del(&queue->napi);
|
|
|
|
if (queue->task) {
|
|
del_timer_sync(&queue->rx_stalled);
|
|
kthread_stop(queue->task);
|
|
queue->task = NULL;
|
|
}
|
|
|
|
if (queue->dealloc_task) {
|
|
kthread_stop(queue->dealloc_task);
|
|
queue->dealloc_task = NULL;
|
|
}
|
|
|
|
if (queue->tx_irq) {
|
|
if (queue->tx_irq == queue->rx_irq)
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
else {
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
unbind_from_irqhandler(queue->rx_irq, queue);
|
|
}
|
|
queue->tx_irq = 0;
|
|
}
|
|
|
|
xenvif_unmap_frontend_rings(queue);
|
|
}
|
|
}
|
|
|
|
/* Reverse the relevant parts of xenvif_init_queue().
|
|
* Used for queue teardown from xenvif_free(), and on the
|
|
* error handling paths in xenbus.c:connect().
|
|
*/
|
|
void xenvif_deinit_queue(struct xenvif_queue *queue)
|
|
{
|
|
free_xenballooned_pages(MAX_PENDING_REQS, queue->mmap_pages);
|
|
}
|
|
|
|
void xenvif_free(struct xenvif *vif)
|
|
{
|
|
struct xenvif_queue *queue = NULL;
|
|
unsigned int num_queues = vif->num_queues;
|
|
unsigned int queue_index;
|
|
|
|
unregister_netdev(vif->dev);
|
|
|
|
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
|
queue = &vif->queues[queue_index];
|
|
xenvif_deinit_queue(queue);
|
|
}
|
|
|
|
vfree(vif->queues);
|
|
vif->queues = NULL;
|
|
vif->num_queues = 0;
|
|
|
|
free_netdev(vif->dev);
|
|
|
|
module_put(THIS_MODULE);
|
|
}
|