/*
* Network-device interface management.
*
* Copyright (c) 2004-2005, Keir Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "common.h"
#include <linux/kthread.h>
#include <linux/sched/task.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/if_vlan.h>
#include <linux/vmalloc.h>
#include <xen/events.h>
#include <asm/xen/hypercall.h>
#include <xen/balloon.h>
/* Number of bytes allowed on the internal guest Rx queue. */
#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
/* This function is used to set SKBFL_ZEROCOPY_ENABLE as well as
* increasing the inflight counter. We need to increase the inflight
* counter because core driver calls into xenvif_zerocopy_callback
* which calls xenvif_skb_zerocopy_complete.
*/
void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
struct sk_buff *skb)
{
skb_shinfo(skb)->flags |= SKBFL_ZEROCOPY_ENABLE;
atomic_inc(&queue->inflight_packets);
}
void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
{
atomic_dec(&queue->inflight_packets);
/* Wake the dealloc thread _after_ decrementing inflight_packets so
* that if kthread_stop() has already been called, the dealloc thread
* does not wait forever with nothing to wake it.
*/
wake_up(&queue->dealloc_wq);
}
static int xenvif_schedulable(struct xenvif *vif)
{
return netif_running(vif->dev) &&
test_bit(VIF_STATUS_CONNECTED, &vif->status) &&
!vif->disabled;
}
static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue)
{
bool rc;
rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx);
if (rc)
napi_schedule(&queue->napi);
return rc;
}
static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
{
struct xenvif_queue *queue = dev_id;
int old;
old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending);
WARN(old & NETBK_TX_EOI, "Interrupt while EOI pending\n");
if (!xenvif_handle_tx_interrupt(queue)) {
atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending);
xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
}
return IRQ_HANDLED;
}
static int xenvif_poll(struct napi_struct *napi, int budget)
{
struct xenvif_queue *queue =
container_of(napi, struct xenvif_queue, napi);
int work_done;
/* This vif is rogue, we pretend we've there is nothing to do
* for this vif to deschedule it from NAPI. But this interface
* will be turned off in thread context later.
*/
if (unlikely(queue->vif->disabled)) {
napi_complete(napi);
return 0;
}
work_done = xenvif_tx_action(queue, budget);
if (work_done < budget) {
napi_complete_done(napi, work_done);
/* If the queue is rate-limited, it shall be
* rescheduled in the timer callback.
*/
if (likely(!queue->rate_limited))
xenvif_napi_schedule_or_enable_events(queue);
}
return work_done;
}
static bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue)
{
bool rc;
rc = xenvif_have_rx_work(queue, false);
if (rc)
xenvif_kick_thread(queue);
return rc;
}
static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
{
struct xenvif_queue *queue = dev_id;
int old;
old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending);
WARN(old & NETBK_RX_EOI, "Interrupt while EOI pending\n");
if (!xenvif_handle_rx_interrupt(queue)) {
atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending);
xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
}
return IRQ_HANDLED;
}
irqreturn_t xenvif_interrupt(int irq, void *dev_id)
{
struct xenvif_queue *queue = dev_id;
int old;
bool has_rx, has_tx;
old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);
WARN(old, "Interrupt while EOI pending\n");
has_tx = xenvif_handle_tx_interrupt(queue);
has_rx = xenvif_handle_rx_interrupt(queue);
if (!has_rx && !has_tx) {
atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);
xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
}
return IRQ_HANDLED;
}
static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
struct net_device *sb_dev)
{
struct xenvif *vif = netdev_priv(dev);
unsigned int size = vif->hash.size;
unsigned int num_queues;
/* If queues are not set up internally - always return 0
* as the packet going to be dropped anyway */
num_queues = READ_ONCE(vif->num_queues);
if (num_queues < 1)
return 0;
if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
return netdev_pick_tx(dev, skb, NULL) %
dev->real_num_tx_queues;
xenvif_set_skb_hash(vif, skb);
if (size == 0)
return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
return vif->hash.mapping[vif->hash.mapping_sel]
[skb_get_hash_raw(skb) % size];
}
static netdev_tx_t
xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
struct xenvif_queue *queue = NULL;
unsigned int num_queues;
u16 index;
struct xenvif_rx_cb *cb;
BUG_ON(skb->dev != dev);
/* Drop the packet if queues are not set up.
* This handler should be called inside an RCU read section
* so we don't need to enter it here explicitly.
*/
num_queues = READ_ONCE(vif->num_queues);
if (num_queues < 1)
goto drop;
/* Obtain the queue to be used to transmit this packet */
index = skb_get_queue_mapping(skb);
if (index >= num_queues) {
pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",
index, vif->dev->name);
index %= num_queues;
}
queue = &vif->queues[index];
/* Drop the packet if queue is not ready */
if (queue->task == NULL ||
queue->dealloc_task == NULL ||
!xenvif_schedulable(vif))
goto drop;
if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) {
struct ethhdr *eth = (struct ethhdr *)skb->data;
if (!xenvif_mcast_match(vif, eth->h_dest))
goto drop;
}
cb = XENVIF_RX_CB(skb);
cb->expires = jiffies + vif->drain_timeout;
/* If there is no hash algorithm configured then make sure there
* is no hash information in the socket buffer otherwise it
* would be incorrectly forwarded to the frontend.
*/
if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
skb_clear_hash(skb);
/* timestamp packet in software */
skb_tx_timestamp(skb);
if (!xenvif_rx_queue_tail(queue, skb))
goto drop;
xenvif_kick_thread(queue);
return NETDEV_TX_OK;
drop:
vif->dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
struct xenvif_queue *queue = NULL;
unsigned int num_queues;
u64 rx_bytes = 0;
u64 rx_packets = 0;
u64 tx_bytes = 0;
u64 tx_packets = 0;
unsigned int index;
rcu_read_lock();
num_queues = READ_ONCE(vif->num_queues);
/* Aggregate tx and rx stats from each queue */
for (index = 0; index < num_queues; ++index) {
queue = &vif->queues[index];
rx_bytes += queue->stats.rx_bytes;
rx_packets += queue->stats.rx_packets;
tx_bytes += queue->stats.tx_bytes;
tx_packets += queue->stats.tx_packets;
}
rcu_read_unlock();
vif->dev->stats.rx_bytes = rx_bytes;
vif->dev->stats.rx_packets = rx_packets;
vif->dev->stats.tx_bytes = tx_bytes;
vif->dev->stats.tx_packets = tx_packets;
return &vif->dev->stats;
}
static void xenvif_up(struct xenvif *vif)
{
struct xenvif_queue *queue = NULL;
unsigned int num_queues = vif->num_queues;
unsigned int queue_index;
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
napi_enable(&queue->napi);
enable_irq(queue->tx_irq);
if (queue->tx_irq != queue->rx_irq)
enable_irq(queue->rx_irq);
xenvif_napi_schedule_or_enable_events(queue);
}
}
static void xenvif_down(struct xenvif *vif)
{
struct xenvif_queue *queue = NULL;
unsigned int num_queues = vif->num_queues;
unsigned int queue_index;
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
disable_irq(queue->tx_irq);
if (queue->tx_irq != queue->rx_irq)
disable_irq(queue->rx_irq);
napi_disable(&queue->napi);
del_timer_sync(&queue->credit_timeout);
}
}
static int xenvif_open(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
xenvif_up(vif);
netif_tx_start_all_queues(dev);
return 0;
}
static int xenvif_close(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
xenvif_down(vif);
netif_tx_stop_all_queues(dev);
return 0;
}
static int xenvif_change_mtu(struct net_device *dev, int mtu)
{
struct xenvif *vif = netdev_priv(dev);
int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;
if (mtu > max)
return -EINVAL;
WRITE_ONCE(dev->mtu, mtu);
return 0;
}
static netdev_features_t xenvif_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct xenvif *vif = netdev_priv(dev);
if (!vif->can_sg)
features &= ~NETIF_F_SG;
if (~(vif->gso_mask) & GSO_BIT(TCPV4))
features &= ~NETIF_F_TSO;
if (~(vif->gso_mask) & GSO_BIT(TCPV6))
features &= ~NETIF_F_TSO6;
if (!vif->ip_csum)
features &= ~NETIF_F_IP_CSUM;
if (!vif->ipv6_csum)
features &= ~NETIF_F_IPV6_CSUM;
return features;
}
static const struct xenvif_stat {
char name[ETH_GSTRING_LEN];
u16 offset;
} xenvif_stats[] = {
{
"rx_gso_checksum_fixup",
offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
},
/* If (sent != success + fail), there are probably packets never
* freed up properly!
*/
{
"tx_zerocopy_sent",
offsetof(struct xenvif_stats, tx_zerocopy_sent),
},
{
"tx_zerocopy_success",
offsetof(struct xenvif_stats, tx_zerocopy_success),
},
{
"tx_zerocopy_fail",
offsetof(struct xenvif_stats, tx_zerocopy_fail)
},
/* Number of packets exceeding MAX_SKB_FRAG slots. You should use
* a guest with the same MAX_SKB_FRAG
*/
{
"tx_frag_overflow",
offsetof(struct xenvif_stats, tx_frag_overflow)
},
};
static int xenvif_get_sset_count(struct net_device *dev, int string_set)
{
switch (string_set) {
case ETH_SS_STATS:
return ARRAY_SIZE(xenvif_stats);
default:
return -EINVAL;
}
}
static void xenvif_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 * data)
{
struct xenvif *vif = netdev_priv(dev);
unsigned int num_queues;
int i;
unsigned int queue_index;
rcu_read_lock();
num_queues = READ_ONCE(vif->num_queues);
for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
unsigned long accum = 0;
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
void *vif_stats = &vif->queues[queue_index].stats;
accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
}
data[i] = accum;
}
rcu_read_unlock();
}
static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
{
int i;
switch (stringset) {
case ETH_SS_STATS:
for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
memcpy(data + i * ETH_GSTRING_LEN,
xenvif_stats[i].name, ETH_GSTRING_LEN);
break;
}
}
static const struct ethtool_ops xenvif_ethtool_ops = {
.get_link = ethtool_op_get_link,
.get_ts_info = ethtool_op_get_ts_info,
.get_sset_count = xenvif_get_sset_count,
.get_ethtool_stats = xenvif_get_ethtool_stats,
.get_strings = xenvif_get_strings,
};
static const struct net_device_ops xenvif_netdev_ops = {
.ndo_select_queue = xenvif_select_queue,
.ndo_start_xmit = xenvif_start_xmit,
.ndo_get_stats = xenvif_get_stats,
.ndo_open = xenvif_open,
.ndo_stop = xenvif_close,
.ndo_change_mtu = xenvif_change_mtu,
.ndo_fix_features = xenvif_fix_features,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
unsigned int handle)
{
static const u8 dummy_addr[ETH_ALEN] = {
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff,
};
int err;
struct net_device *dev;
struct xenvif *vif;
char name[IFNAMSIZ] = {};
snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
/* Allocate a netdev with the max. supported number of queues.
* When the guest selects the desired number, it will be updated
* via netif_set_real_num_*_queues().
*/
dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN,
ether_setup, xenvif_max_queues);
if (dev == NULL) {
pr_warn("Could not allocate netdev for %s\n", name);
return ERR_PTR(-ENOMEM);
}
SET_NETDEV_DEV(dev, parent);
vif = netdev_priv(dev);
vif->domid = domid;
vif->handle = handle;
vif->can_sg = 1;
vif->ip_csum = 1;
vif->dev = dev;
vif->disabled = false;
vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
/* Start out with no queues. */
vif->queues = NULL;
vif->num_queues = 0;
vif->xdp_headroom = 0;
spin_lock_init(&vif->lock);
INIT_LIST_HEAD(&vif->fe_mcast_addr);
dev->netdev_ops = &xenvif_netdev_ops;
dev->hw_features = NETIF_F_SG |
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_FRAGLIST;
dev->features = dev->hw_features | NETIF_F_RXCSUM;
dev->ethtool_ops = &xenvif_ethtool_ops;
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
/*
* 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)
*/
eth_hw_addr_set(dev, dummy_addr);
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;
timer_setup(&queue->credit_timeout, xenvif_tx_credit_callback, 0);
queue->credit_window_start = get_jiffies_64();
queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;
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 = gnttab_alloc_pages(MAX_PENDING_REQS,
queue->mmap_pages);
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_msgzc)
{ { .ops = &xenvif_ubuf_ops },
{ { .ctx = NULL,
.desc = i } } };
queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
}
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);
if (netif_running(vif->dev))
xenvif_up(vif);
rtnl_unlock();
}
int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
unsigned int evtchn)
{
struct net_device *dev = vif->dev;
struct xenbus_device *xendev = xenvif_to_xenbus_device(vif);
void *addr;
struct xen_netif_ctrl_sring *shared;
RING_IDX rsp_prod, req_prod;
int err;
err = xenbus_map_ring_valloc(xendev, &ring_ref, 1, &addr);
if (err)
goto err;
shared = (struct xen_netif_ctrl_sring *)addr;
rsp_prod = READ_ONCE(shared->rsp_prod);
req_prod = READ_ONCE(shared->req_prod);
BACK_RING_ATTACH(&vif->ctrl, shared, rsp_prod, XEN_PAGE_SIZE);
err = -EIO;
if (req_prod - rsp_prod > RING_SIZE(&vif->ctrl))
goto err_unmap;
err = bind_interdomain_evtchn_to_irq_lateeoi(xendev, evtchn);
if (err < 0)
goto err_unmap;
vif->ctrl_irq = err;
xenvif_init_hash(vif);
err = request_threaded_irq(vif->ctrl_irq, NULL, xenvif_ctrl_irq_fn,
IRQF_ONESHOT, "xen-netback-ctrl", vif);
if (err) {
pr_warn("Could not setup irq handler for %s\n", dev->name);
goto err_deinit;
}
return 0;
err_deinit:
xenvif_deinit_hash(vif);
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;
err_unmap:
xenbus_unmap_ring_vfree(xendev, vif->ctrl.sring);
vif->ctrl.sring = NULL;
err:
return err;
}
static void xenvif_disconnect_queue(struct xenvif_queue *queue)
{
if (queue->task) {
kthread_stop_put(queue->task);
queue->task = NULL;
}
if (queue->dealloc_task) {
kthread_stop(queue->dealloc_task);
queue->dealloc_task = NULL;
}
if (queue->napi.poll) {
netif_napi_del(&queue->napi);
queue->napi.poll = NULL;
}
if (queue->tx_irq) {
unbind_from_irqhandler(queue->tx_irq, queue);
if (queue->tx_irq == queue->rx_irq)
queue->rx_irq = 0;
queue->tx_irq = 0;
}
if (queue->rx_irq) {
unbind_from_irqhandler(queue->rx_irq, queue);
queue->rx_irq = 0;
}
xenvif_unmap_frontend_data_rings(queue);
}
int xenvif_connect_data(struct xenvif_queue *queue,
unsigned long tx_ring_ref,
unsigned long rx_ring_ref,
unsigned int tx_evtchn,
unsigned int rx_evtchn)
{
struct xenbus_device *dev = xenvif_to_xenbus_device(queue->vif);
struct task_struct *task;
int err;
BUG_ON(queue->tx_irq);
BUG_ON(queue->task);
BUG_ON(queue->dealloc_task);
err = xenvif_map_frontend_data_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);
queue->stalled = true;
task = kthread_run(xenvif_kthread_guest_rx, queue,
"%s-guest-rx", queue->name);
if (IS_ERR(task))
goto kthread_err;
queue->task = task;
/*
* Take a reference to the task in order to prevent it from being freed
* if the thread function returns before kthread_stop is called.
*/
get_task_struct(task);
task = kthread_run(xenvif_dealloc_kthread, queue,
"%s-dealloc", queue->name);
if (IS_ERR(task))
goto kthread_err;
queue->dealloc_task = task;
if (tx_evtchn == rx_evtchn) {
/* feature-split-event-channels == 0 */
err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
dev, tx_evtchn, xenvif_interrupt, 0,
queue->name, queue);
if (err < 0)
goto err;
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_lateeoi(
dev, tx_evtchn, xenvif_tx_interrupt, 0,
queue->tx_irq_name, queue);
if (err < 0)
goto err;
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_lateeoi(
dev, rx_evtchn, xenvif_rx_interrupt, 0,
queue->rx_irq_name, queue);
if (err < 0)
goto err;
queue->rx_irq = err;
disable_irq(queue->rx_irq);
}
return 0;
kthread_err:
pr_warn("Could not allocate kthread for %s\n", queue->name);
err = PTR_ERR(task);
err:
xenvif_disconnect_queue(queue);
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_data(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];
xenvif_disconnect_queue(queue);
}
xenvif_mcast_addr_list_free(vif);
}
void xenvif_disconnect_ctrl(struct xenvif *vif)
{
if (vif->ctrl_irq) {
xenvif_deinit_hash(vif);
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;
}
if (vif->ctrl.sring) {
xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
vif->ctrl.sring);
vif->ctrl.sring = NULL;
}
}
/* 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)
{
gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);
}
void xenvif_free(struct xenvif *vif)
{
struct xenvif_queue *queues = vif->queues;
unsigned int num_queues = vif->num_queues;
unsigned int queue_index;
unregister_netdev(vif->dev);
free_netdev(vif->dev);
for (queue_index = 0; queue_index < num_queues; ++queue_index)
xenvif_deinit_queue(&queues[queue_index]);
vfree(queues);
module_put(THIS_MODULE);
}
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