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Message-ID: <1327934734-8908-17-git-send-email-wei.liu2@citrix.com>
Date: Mon, 30 Jan 2012 14:45:34 +0000
From: Wei Liu <wei.liu2@...rix.com>
To: netdev@...r.kernel.org, xen-devel@...ts.xensource.com
CC: ian.campbell@...rix.com, konrad.wilk@...cle.com,
Wei Liu <wei.liu2@...rix.com>
Subject: [RFC PATCH V3 16/16] netfront: split event channels support.
If this feature is not activated, rx_irq = tx_irq. See corresponding
netback change log for details.
Signed-off-by: Wei Liu <wei.liu2@...rix.com>
---
drivers/net/xen-netfront.c | 147 ++++++++++++++++++++++++++++++++++----------
1 files changed, 115 insertions(+), 32 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 32ec212..72c0429 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -98,7 +98,9 @@ struct netfront_info {
unsigned long rx_gso_checksum_fixup;
- unsigned int evtchn;
+ unsigned int split_evtchn;
+ unsigned int tx_evtchn, rx_evtchn;
+ unsigned int tx_irq, rx_irq;
struct xenbus_device *xbdev;
spinlock_t tx_lock;
@@ -344,7 +346,7 @@ no_skb:
push:
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
if (notify)
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->rx_irq);
}
static int xennet_open(struct net_device *dev)
@@ -577,7 +579,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
if (notify)
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->tx_irq);
u64_stats_update_begin(&stats->syncp);
stats->tx_bytes += skb->len;
@@ -1242,22 +1244,35 @@ static int xennet_set_features(struct net_device *dev, u32 features)
return 0;
}
-static irqreturn_t xennet_interrupt(int irq, void *dev_id)
+static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
{
- struct net_device *dev = dev_id;
- struct netfront_info *np = netdev_priv(dev);
+ struct netfront_info *np = dev_id;
+ struct net_device *dev = np->netdev;
unsigned long flags;
spin_lock_irqsave(&np->tx_lock, flags);
+ xennet_tx_buf_gc(dev);
+ spin_unlock_irqrestore(&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);
- }
+ return IRQ_HANDLED;
+}
- spin_unlock_irqrestore(&np->tx_lock, flags);
+static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
+{
+ struct netfront_info *np = dev_id;
+ struct net_device *dev = np->netdev;
+
+ if (likely(netif_carrier_ok(dev)) &&
+ RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
+ napi_schedule(&np->napi);
+
+ return IRQ_HANDLED;
+}
+static irqreturn_t xennet_interrupt(int irq, void *dev_id)
+{
+ xennet_tx_interrupt(0, dev_id);
+
+ xennet_rx_interrupt(0, dev_id);
return IRQ_HANDLED;
}
@@ -1436,9 +1451,14 @@ static void xennet_disconnect_backend(struct netfront_info *info)
spin_unlock_irq(&info->tx_lock);
spin_unlock_bh(&info->rx_lock);
- if (info->netdev->irq)
- unbind_from_irqhandler(info->netdev->irq, info->netdev);
- info->evtchn = info->netdev->irq = 0;
+ if (info->tx_irq && (info->tx_irq == info->rx_irq))
+ unbind_from_irqhandler(info->tx_irq, info);
+ if (info->tx_irq && (info->tx_irq != info->rx_irq)) {
+ unbind_from_irqhandler(info->tx_irq, info);
+ unbind_from_irqhandler(info->rx_irq, info);
+ }
+ info->tx_evtchn = info->tx_irq = 0;
+ info->rx_evtchn = info->rx_irq = 0;
for (i = 0; i < info->tx_ring_pages; i++) {
int ref = info->tx_ring_ref[i];
@@ -1507,6 +1527,7 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
int err;
struct net_device *netdev = info->netdev;
unsigned int max_tx_ring_page_order, max_rx_ring_page_order;
+ unsigned int split_evtchn;
int i, j;
for (i = 0; i < XENNET_MAX_RING_PAGES; i++) {
@@ -1515,7 +1536,6 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
}
info->rx.sring = NULL;
info->tx.sring = NULL;
- netdev->irq = 0;
err = xen_net_read_mac(dev, netdev->dev_addr);
if (err) {
@@ -1524,6 +1544,12 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
}
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "split-event-channels", "%u",
+ &split_evtchn);
+ if (err < 0)
+ split_evtchn = 0;
+
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"max-tx-ring-page-order", "%u",
&max_tx_ring_page_order);
if (err < 0) {
@@ -1589,20 +1615,59 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
info->rx_ring_ref[j] = err;
}
- err = xenbus_alloc_evtchn(dev, &info->evtchn);
- if (err)
- goto alloc_evtchn_fail;
+ if (!split_evtchn) {
+ err = xenbus_alloc_evtchn(dev, &info->tx_evtchn);
+ if (err)
+ goto alloc_evtchn_fail;
- err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt,
- 0, netdev->name, netdev);
- if (err < 0)
- goto bind_fail;
- netdev->irq = err;
+ err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+ xennet_interrupt,
+ 0, netdev->name, info);
+ if (err < 0)
+ goto bind_fail;
+ info->rx_evtchn = info->tx_evtchn;
+ info->tx_irq = info->rx_irq = err;
+ info->split_evtchn = 0;
+ dev_info(&dev->dev, "single event channel, irq = %d\n",
+ info->tx_irq);
+ } else {
+ err = xenbus_alloc_evtchn(dev, &info->tx_evtchn);
+ if (err)
+ goto alloc_evtchn_fail;
+ err = xenbus_alloc_evtchn(dev, &info->rx_evtchn);
+ if (err) {
+ xenbus_free_evtchn(dev, info->tx_evtchn);
+ goto alloc_evtchn_fail;
+ }
+ err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+ xennet_tx_interrupt,
+ 0, netdev->name, info);
+ if (err < 0)
+ goto bind_fail;
+ info->tx_irq = err;
+ err = bind_evtchn_to_irqhandler(info->rx_evtchn,
+ xennet_rx_interrupt,
+ 0, netdev->name, info);
+ if (err < 0) {
+ unbind_from_irqhandler(info->tx_irq, info);
+ goto bind_fail;
+ }
+ info->rx_irq = err;
+ info->split_evtchn = 1;
+ dev_info(&dev->dev, "split event channels,"
+ " tx_irq = %d, rx_irq = %d\n",
+ info->tx_irq, info->rx_irq);
+ }
return 0;
bind_fail:
- xenbus_free_evtchn(dev, info->evtchn);
+ if (!split_evtchn)
+ xenbus_free_evtchn(dev, info->tx_evtchn);
+ else {
+ xenbus_free_evtchn(dev, info->tx_evtchn);
+ xenbus_free_evtchn(dev, info->rx_evtchn);
+ }
alloc_evtchn_fail:
for (; j >= 0; j--) {
int ref = info->rx_ring_ref[j];
@@ -1690,11 +1755,27 @@ again:
}
}
- err = xenbus_printf(xbt, dev->nodename,
- "event-channel", "%u", info->evtchn);
- if (err) {
- message = "writing event-channel";
- goto abort_transaction;
+
+ if (!info->split_evtchn) {
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel", "%u", info->tx_evtchn);
+ if (err) {
+ message = "writing event-channel";
+ goto abort_transaction;
+ }
+ } else {
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel-tx", "%u", info->tx_evtchn);
+ if (err) {
+ message = "writing event-channel-tx";
+ goto abort_transaction;
+ }
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel-rx", "%u", info->rx_evtchn);
+ if (err) {
+ message = "writing event-channel-rx";
+ goto abort_transaction;
+ }
}
err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
@@ -1808,7 +1889,9 @@ static int xennet_connect(struct net_device *dev)
* packets.
*/
netif_carrier_on(np->netdev);
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->tx_irq);
+ if (np->split_evtchn)
+ notify_remote_via_irq(np->rx_irq);
xennet_tx_buf_gc(dev);
xennet_alloc_rx_buffers(dev);
--
1.7.2.5
--
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