506 lines
12 KiB
C
506 lines
12 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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#define XENVIF_QUEUE_LENGTH 32
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#define XENVIF_NAPI_WEIGHT 64
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int xenvif_schedulable(struct xenvif *vif)
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{
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return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
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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 *vif = dev_id;
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if (RING_HAS_UNCONSUMED_REQUESTS(&vif->tx))
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napi_schedule(&vif->napi);
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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 *vif = container_of(napi, struct xenvif, napi);
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int work_done;
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work_done = xenvif_tx_action(vif, budget);
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if (work_done < budget) {
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int more_to_do = 0;
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unsigned long flags;
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/* It is necessary to disable IRQ before calling
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* RING_HAS_UNCONSUMED_REQUESTS. Otherwise we might
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* lose event from the frontend.
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*
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* Consider:
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* RING_HAS_UNCONSUMED_REQUESTS
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* <frontend generates event to trigger napi_schedule>
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* __napi_complete
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*
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* This handler is still in scheduled state so the
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* event has no effect at all. After __napi_complete
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* this handler is descheduled and cannot get
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* scheduled again. We lose event in this case and the ring
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* will be completely stalled.
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*/
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local_irq_save(flags);
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RING_FINAL_CHECK_FOR_REQUESTS(&vif->tx, more_to_do);
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if (!more_to_do)
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__napi_complete(napi);
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local_irq_restore(flags);
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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 *vif = dev_id;
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vif->rx_event = true;
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xenvif_kick_thread(vif);
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return IRQ_HANDLED;
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}
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static 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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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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int min_slots_needed;
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BUG_ON(skb->dev != dev);
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/* Drop the packet if vif is not ready */
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if (vif->task == NULL || !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_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
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skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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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(vif, min_slots_needed))
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xenvif_stop_queue(vif);
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skb_queue_tail(&vif->rx_queue, skb);
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xenvif_kick_thread(vif);
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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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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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napi_enable(&vif->napi);
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enable_irq(vif->tx_irq);
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if (vif->tx_irq != vif->rx_irq)
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enable_irq(vif->rx_irq);
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xenvif_check_rx_xenvif(vif);
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}
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static void xenvif_down(struct xenvif *vif)
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{
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napi_disable(&vif->napi);
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disable_irq(vif->tx_irq);
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if (vif->tx_irq != vif->rx_irq)
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disable_irq(vif->rx_irq);
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del_timer_sync(&vif->credit_timeout);
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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 (netif_carrier_ok(dev))
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xenvif_up(vif);
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netif_start_queue(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 (netif_carrier_ok(dev))
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xenvif_down(vif);
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netif_stop_queue(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, rx_gso_checksum_fixup)
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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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void *vif = netdev_priv(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
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data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
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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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int i;
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snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
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dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
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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->grant_copy_op = vmalloc(sizeof(struct gnttab_copy) *
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MAX_GRANT_COPY_OPS);
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if (vif->grant_copy_op == NULL) {
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pr_warn("Could not allocate grant copy space for %s\n", name);
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free_netdev(dev);
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return ERR_PTR(-ENOMEM);
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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->credit_bytes = vif->remaining_credit = ~0UL;
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vif->credit_usec = 0UL;
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init_timer(&vif->credit_timeout);
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vif->credit_window_start = get_jiffies_64();
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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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SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
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dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
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skb_queue_head_init(&vif->rx_queue);
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skb_queue_head_init(&vif->tx_queue);
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vif->pending_cons = 0;
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vif->pending_prod = MAX_PENDING_REQS;
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for (i = 0; i < MAX_PENDING_REQS; i++)
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vif->pending_ring[i] = i;
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for (i = 0; i < MAX_PENDING_REQS; i++)
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vif->mmap_pages[i] = NULL;
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/*
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* Initialise a dummy MAC address. We choose the numerically
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* largest non-broadcast address to prevent the address getting
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* stolen by an Ethernet bridge for STP purposes.
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* (FE:FF:FF:FF:FF:FF)
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*/
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memset(dev->dev_addr, 0xFF, ETH_ALEN);
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dev->dev_addr[0] &= ~0x01;
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netif_napi_add(dev, &vif->napi, xenvif_poll, XENVIF_NAPI_WEIGHT);
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netif_carrier_off(dev);
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err = register_netdev(dev);
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if (err) {
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netdev_warn(dev, "Could not register device: err=%d\n", err);
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free_netdev(dev);
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return ERR_PTR(err);
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}
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netdev_dbg(dev, "Successfully created xenvif\n");
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__module_get(THIS_MODULE);
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return vif;
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}
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int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
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unsigned long rx_ring_ref, unsigned int tx_evtchn,
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unsigned int rx_evtchn)
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{
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struct task_struct *task;
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int err = -ENOMEM;
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BUG_ON(vif->tx_irq);
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BUG_ON(vif->task);
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err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
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if (err < 0)
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goto err;
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init_waitqueue_head(&vif->wq);
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if (tx_evtchn == rx_evtchn) {
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/* feature-split-event-channels == 0 */
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err = bind_interdomain_evtchn_to_irqhandler(
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vif->domid, tx_evtchn, xenvif_interrupt, 0,
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vif->dev->name, vif);
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if (err < 0)
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goto err_unmap;
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vif->tx_irq = vif->rx_irq = err;
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disable_irq(vif->tx_irq);
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} else {
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/* feature-split-event-channels == 1 */
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snprintf(vif->tx_irq_name, sizeof(vif->tx_irq_name),
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"%s-tx", vif->dev->name);
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err = bind_interdomain_evtchn_to_irqhandler(
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vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
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vif->tx_irq_name, vif);
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if (err < 0)
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goto err_unmap;
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vif->tx_irq = err;
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disable_irq(vif->tx_irq);
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snprintf(vif->rx_irq_name, sizeof(vif->rx_irq_name),
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"%s-rx", vif->dev->name);
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err = bind_interdomain_evtchn_to_irqhandler(
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vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
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vif->rx_irq_name, vif);
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if (err < 0)
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goto err_tx_unbind;
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vif->rx_irq = err;
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disable_irq(vif->rx_irq);
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}
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task = kthread_create(xenvif_kthread,
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(void *)vif, "%s", vif->dev->name);
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if (IS_ERR(task)) {
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pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
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err = PTR_ERR(task);
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goto err_rx_unbind;
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}
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vif->task = task;
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rtnl_lock();
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if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
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dev_set_mtu(vif->dev, ETH_DATA_LEN);
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netdev_update_features(vif->dev);
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netif_carrier_on(vif->dev);
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if (netif_running(vif->dev))
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xenvif_up(vif);
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rtnl_unlock();
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wake_up_process(vif->task);
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return 0;
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err_rx_unbind:
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unbind_from_irqhandler(vif->rx_irq, vif);
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vif->rx_irq = 0;
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err_tx_unbind:
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unbind_from_irqhandler(vif->tx_irq, vif);
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vif->tx_irq = 0;
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err_unmap:
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xenvif_unmap_frontend_rings(vif);
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err:
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module_put(THIS_MODULE);
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return err;
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}
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void xenvif_carrier_off(struct xenvif *vif)
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{
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struct net_device *dev = vif->dev;
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rtnl_lock();
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netif_carrier_off(dev); /* discard queued packets */
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if (netif_running(dev))
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xenvif_down(vif);
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rtnl_unlock();
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}
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void xenvif_disconnect(struct xenvif *vif)
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{
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if (netif_carrier_ok(vif->dev))
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xenvif_carrier_off(vif);
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if (vif->task) {
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kthread_stop(vif->task);
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vif->task = NULL;
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}
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if (vif->tx_irq) {
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if (vif->tx_irq == vif->rx_irq)
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unbind_from_irqhandler(vif->tx_irq, vif);
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else {
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unbind_from_irqhandler(vif->tx_irq, vif);
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unbind_from_irqhandler(vif->rx_irq, vif);
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}
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vif->tx_irq = 0;
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}
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xenvif_unmap_frontend_rings(vif);
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}
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void xenvif_free(struct xenvif *vif)
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{
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netif_napi_del(&vif->napi);
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unregister_netdev(vif->dev);
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vfree(vif->grant_copy_op);
|
|
free_netdev(vif->dev);
|
|
|
|
module_put(THIS_MODULE);
|
|
}
|