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SubjectRe: [PATCH] add netconsole support for xen-netfront
On Wed, Jan 11, 2012 at 04:52:36PM +0800, Zhenzhong Duan wrote:
> add polling interface to xen-netfront device to support netconsole
>

Ian, any thoughts on the spinlock changes?

> Signed-off-by: Tina.Yang <tina.yang@oracle.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Jeremy Fitzhardinge <jeremy@goop.org>
> Signed-off-by: Zhenzhong.Duan <zhenzhong.duan@oracle.com>
> Tested-by: gurudas.pai <gurudas.pai@oracle.com>
> ---
> drivers/net/xen-netfront.c | 57 ++++++++++++++++++++++++++-----------------
> 1 files changed, 34 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index fa67905..db638b4 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -489,6 +489,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
> int frags = skb_shinfo(skb)->nr_frags;
> unsigned int offset = offset_in_page(data);
> unsigned int len = skb_headlen(skb);
> + unsigned long flags;
>
> frags += DIV_ROUND_UP(offset + len, PAGE_SIZE);
> if (unlikely(frags > MAX_SKB_FRAGS + 1)) {
> @@ -498,12 +499,12 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
> goto drop;
> }
>
> - spin_lock_irq(&np->tx_lock);
> + spin_lock_irqsave(&np->tx_lock, flags);
>
> if (unlikely(!netif_carrier_ok(dev) ||
> (frags > 1 && !xennet_can_sg(dev)) ||
> netif_needs_gso(skb, netif_skb_features(skb)))) {
> - spin_unlock_irq(&np->tx_lock);
> + spin_unlock_irqrestore(&np->tx_lock, flags);
> goto drop;
> }
>
> @@ -574,7 +575,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
> if (!netfront_tx_slot_available(np))
> netif_stop_queue(dev);
>
> - spin_unlock_irq(&np->tx_lock);
> + spin_unlock_irqrestore(&np->tx_lock, flags);
>
> return NETDEV_TX_OK;
>
> @@ -1228,6 +1229,33 @@ static int xennet_set_features(struct net_device *dev,
> return 0;
> }
>
> +static irqreturn_t xennet_interrupt(int irq, void *dev_id)
> +{
> + struct net_device *dev = dev_id;
> + struct netfront_info *np = netdev_priv(dev);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&np->tx_lock, flags);
> +
> + if (likely(netif_carrier_ok(dev))) {
> + xennet_tx_buf_gc(dev);
> + /* Under tx_lock: protects access to rx shared-ring indexes. */
> + if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
> + napi_schedule(&np->napi);
> + }
> +
> + spin_unlock_irqrestore(&np->tx_lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> +static void xennet_poll_controller(struct net_device *dev)
> +{
> + xennet_interrupt(0, dev);
> +}
> +#endif
> +
> static const struct net_device_ops xennet_netdev_ops = {
> .ndo_open = xennet_open,
> .ndo_uninit = xennet_uninit,
> @@ -1239,6 +1267,9 @@ static const struct net_device_ops xennet_netdev_ops = {
> .ndo_validate_addr = eth_validate_addr,
> .ndo_fix_features = xennet_fix_features,
> .ndo_set_features = xennet_set_features,
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> + .ndo_poll_controller = xennet_poll_controller,
> +#endif
> };
>
> static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev)
> @@ -1448,26 +1479,6 @@ static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
> return 0;
> }
>
> -static irqreturn_t xennet_interrupt(int irq, void *dev_id)
> -{
> - struct net_device *dev = dev_id;
> - struct netfront_info *np = netdev_priv(dev);
> - unsigned long flags;
> -
> - spin_lock_irqsave(&np->tx_lock, flags);
> -
> - if (likely(netif_carrier_ok(dev))) {
> - xennet_tx_buf_gc(dev);
> - /* Under tx_lock: protects access to rx shared-ring indexes. */
> - if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
> - napi_schedule(&np->napi);
> - }
> -
> - spin_unlock_irqrestore(&np->tx_lock, flags);
> -
> - return IRQ_HANDLED;
> -}
> -
> static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
> {
> struct xen_netif_tx_sring *txs;
> --
> 1.7.3


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