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871 lines
22 KiB
871 lines
22 KiB
/* |
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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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|
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#include "common.h" |
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|
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#include <linux/kthread.h> |
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#include <linux/sched/task.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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|
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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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|
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#define XENVIF_QUEUE_LENGTH 32 |
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#define XENVIF_NAPI_WEIGHT 64 |
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|
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/* Number of bytes allowed on the internal guest Rx queue. */ |
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#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE) |
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|
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/* This function is used to set SKBFL_ZEROCOPY_ENABLE 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)->flags |= SKBFL_ZEROCOPY_ENABLE; |
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atomic_inc(&queue->inflight_packets); |
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} |
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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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/* Wake the dealloc thread _after_ decrementing inflight_packets so |
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* that if kthread_stop() has already been called, the dealloc thread |
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* does not wait forever with nothing to wake it. |
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*/ |
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wake_up(&queue->dealloc_wq); |
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} |
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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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!vif->disabled; |
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} |
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|
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static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue) |
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{ |
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bool rc; |
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rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx); |
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if (rc) |
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napi_schedule(&queue->napi); |
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return rc; |
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} |
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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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int old; |
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old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending); |
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WARN(old & NETBK_TX_EOI, "Interrupt while EOI pending\n"); |
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if (!xenvif_handle_tx_interrupt(queue)) { |
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atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending); |
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xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS); |
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} |
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return IRQ_HANDLED; |
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} |
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static 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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|
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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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|
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if (work_done < budget) { |
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napi_complete_done(napi, work_done); |
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/* If the queue is rate-limited, it shall be |
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* rescheduled in the timer callback. |
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*/ |
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if (likely(!queue->rate_limited)) |
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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 bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue) |
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{ |
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bool rc; |
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rc = xenvif_have_rx_work(queue, false); |
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if (rc) |
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xenvif_kick_thread(queue); |
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return rc; |
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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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int old; |
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old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending); |
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WARN(old & NETBK_RX_EOI, "Interrupt while EOI pending\n"); |
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if (!xenvif_handle_rx_interrupt(queue)) { |
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atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending); |
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xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS); |
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} |
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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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struct xenvif_queue *queue = dev_id; |
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int old; |
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bool has_rx, has_tx; |
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old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending); |
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WARN(old, "Interrupt while EOI pending\n"); |
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has_tx = xenvif_handle_tx_interrupt(queue); |
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has_rx = xenvif_handle_rx_interrupt(queue); |
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if (!has_rx && !has_tx) { |
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atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending); |
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xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS); |
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} |
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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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static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb, |
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struct net_device *sb_dev) |
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{ |
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struct xenvif *vif = netdev_priv(dev); |
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unsigned int size = vif->hash.size; |
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unsigned int num_queues; |
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/* If queues are not set up internally - always return 0 |
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* as the packet going to be dropped anyway */ |
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num_queues = READ_ONCE(vif->num_queues); |
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if (num_queues < 1) |
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return 0; |
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if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) |
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return netdev_pick_tx(dev, skb, NULL) % |
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dev->real_num_tx_queues; |
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xenvif_set_skb_hash(vif, skb); |
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if (size == 0) |
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return skb_get_hash_raw(skb) % dev->real_num_tx_queues; |
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return vif->hash.mapping[vif->hash.mapping_sel] |
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[skb_get_hash_raw(skb) % size]; |
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} |
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static netdev_tx_t |
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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; |
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u16 index; |
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struct xenvif_rx_cb *cb; |
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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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* This handler should be called inside an RCU read section |
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* so we don't need to enter it here explicitly. |
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*/ |
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num_queues = READ_ONCE(vif->num_queues); |
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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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if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) { |
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struct ethhdr *eth = (struct ethhdr *)skb->data; |
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if (!xenvif_mcast_match(vif, eth->h_dest)) |
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goto drop; |
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} |
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cb = XENVIF_RX_CB(skb); |
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cb->expires = jiffies + vif->drain_timeout; |
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/* If there is no hash algorithm configured then make sure there |
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* is no hash information in the socket buffer otherwise it |
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* would be incorrectly forwarded to the frontend. |
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*/ |
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if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) |
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skb_clear_hash(skb); |
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xenvif_rx_queue_tail(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; |
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u64 rx_bytes = 0; |
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u64 rx_packets = 0; |
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u64 tx_bytes = 0; |
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u64 tx_packets = 0; |
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unsigned int index; |
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rcu_read_lock(); |
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num_queues = READ_ONCE(vif->num_queues); |
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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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rcu_read_unlock(); |
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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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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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napi_disable(&queue->napi); |
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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 ? ETH_MAX_MTU - 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) & GSO_BIT(TCPV4)) |
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features &= ~NETIF_F_TSO; |
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if (~(vif->gso_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; |
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int i; |
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unsigned int queue_index; |
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|
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rcu_read_lock(); |
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num_queues = READ_ONCE(vif->num_queues); |
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|
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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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void *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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rcu_read_unlock(); |
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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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|
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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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|
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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_select_queue = xenvif_select_queue, |
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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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|
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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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|
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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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|
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SET_NETDEV_DEV(dev, parent); |
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|
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vif = netdev_priv(dev); |
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|
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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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vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs); |
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vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs); |
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|
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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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|
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vif->xdp_headroom = 0; |
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|
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spin_lock_init(&vif->lock); |
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INIT_LIST_HEAD(&vif->fe_mcast_addr); |
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|
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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 | NETIF_F_FRAGLIST; |
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dev->features = dev->hw_features | NETIF_F_RXCSUM; |
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dev->ethtool_ops = &xenvif_ethtool_ops; |
|
|
|
dev->tx_queue_len = XENVIF_QUEUE_LENGTH; |
|
|
|
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_broadcast_addr(dev->dev_addr); |
|
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; |
|
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) |
|
{ .callback = xenvif_zerocopy_callback, |
|
{ { .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(queue->task); |
|
put_task_struct(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, |
|
XENVIF_NAPI_WEIGHT); |
|
|
|
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); |
|
}
|
|
|