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[xen] More netback fixes 

(including reintroducing support for feature-rx-notify, which was regressed by
the fix to #767261).

svn path=/dists/sid/linux/; revision=22235
This commit is contained in:
Ian Campbell 2014-12-29 23:16:40 +00:00
parent d0e9352ff8
commit b84001ac07
6 changed files with 366 additions and 0 deletions
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2
debian/changelog vendored
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@ -34,6 +34,8 @@ linux (3.16.7-ckt2-2) UNRELEASED; urgency=medium
- [/orion5x]: Make SERIO and dependants modular
* [arhmf] Add device-tree for LinkSprite pcDuino V3. Patch from Karsten
Merker (Closes: #774067)
* [xen] More netback fixes (including reintroducing support for
feature-rx-notify, which was regressed by the fix to #767261).
-- Ben Hutchings <ben@decadent.org.uk> Sat, 13 Dec 2014 11:45:48 +0000

50
debian/patches/bugfix/all/netback-don-t-store-invalid-vif-pointer.patch vendored Normal file
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@ -0,0 +1,50 @@
From e67d8dd0e2c1b8b4573a6a3f05f609be230dfaff Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@suse.com>
Date: Tue, 9 Dec 2014 11:47:04 +0000
Subject: [PATCH 3/4] netback: don't store invalid vif pointer
Origin: https://git.kernel.org/linus/f15650b7f94879667f253bc32de7431c1baf2d6e
When xenvif_alloc() fails, it returns a non-NULL error indicator. To
avoid eventual races, we shouldn't store that into struct backend_info
as readers of it only check for NULL.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/xen-netback/xenbus.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 0b4f1c7..cc8f8ba 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -404,6 +404,7 @@ static int backend_create_xenvif(struct backend_info *be)
int err;
long handle;
struct xenbus_device *dev = be->dev;
+ struct xenvif *vif;
if (be->vif != NULL)
return 0;
@@ -414,13 +415,13 @@ static int backend_create_xenvif(struct backend_info *be)
return (err < 0) ? err : -EINVAL;
}
- be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
- if (IS_ERR(be->vif)) {
- err = PTR_ERR(be->vif);
- be->vif = NULL;
+ vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
+ if (IS_ERR(vif)) {
+ err = PTR_ERR(vif);
xenbus_dev_fatal(dev, err, "creating interface");
return err;
}
+ be->vif = vif;
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
return 0;
--
1.7.10.4

38
debian/patches/bugfix/all/xen-netback-Disable-NAPI-after-disabling-interrupts.patch vendored Normal file
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@ -0,0 +1,38 @@
From bafb73e2d50d3addd0f79e09ea3f2e2950505733 Mon Sep 17 00:00:00 2001
From: Zoltan Kiss <zoltan.kiss@linaro.org>
Date: Tue, 28 Oct 2014 15:29:30 +0000
Subject: [PATCH 1/4] xen-netback: Disable NAPI after disabling interrupts
Origin: https://git.kernel.org/linus/8fe78989c3445a221cfcc54964e7e62718883615
Otherwise the interrupt handler still calls napi_complete. Although it
won't schedule NAPI again as either NAPI_STATE_DISABLE or
NAPI_STATE_SCHED is set, it is just unnecessary, and it makes more
sense to do this way.
Signed-off-by: Zoltan Kiss <zoltan.kiss@linaro.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/xen-netback/interface.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 21d8db8..ddcb757 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -235,10 +235,10 @@ static void xenvif_down(struct xenvif *vif)
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
- napi_disable(&queue->napi);
disable_irq(queue->tx_irq);
if (queue->tx_irq != queue->rx_irq)
disable_irq(queue->rx_irq);
+ napi_disable(&queue->napi);
del_timer_sync(&queue->credit_timeout);
}
}
--
1.7.10.4

84
debian/patches/bugfix/all/xen-netback-do-not-report-success-if-backend_create_.patch vendored Normal file
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@ -0,0 +1,84 @@
From 0a640486cd7694015eaa7221714f9a2ce654f7a7 Mon Sep 17 00:00:00 2001
From: Alexey Khoroshilov <khoroshilov@ispras.ru>
Date: Mon, 24 Nov 2014 13:58:00 +0300
Subject: [PATCH 2/4] xen-netback: do not report success if
backend_create_xenvif() fails
Origin: https://git.kernel.org/linus/2dd34339ac6305c4f2f4e589b858212e339d31e9
If xenvif_alloc() or xenbus_scanf() fail in backend_create_xenvif(),
xenbus is left in offline mode but netback_probe() reports success.
The patch implements propagation of error code for backend_create_xenvif().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/xen-netback/xenbus.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 396b3d9..0b4f1c7 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -39,7 +39,7 @@ struct backend_info {
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue);
static void connect(struct backend_info *be);
static int read_xenbus_vif_flags(struct backend_info *be);
-static void backend_create_xenvif(struct backend_info *be);
+static int backend_create_xenvif(struct backend_info *be);
static void unregister_hotplug_status_watch(struct backend_info *be);
static void set_backend_state(struct backend_info *be,
enum xenbus_state state);
@@ -352,7 +352,9 @@ static int netback_probe(struct xenbus_device *dev,
be->state = XenbusStateInitWait;
/* This kicks hotplug scripts, so do it immediately. */
- backend_create_xenvif(be);
+ err = backend_create_xenvif(be);
+ if (err)
+ goto fail;
return 0;
@@ -397,19 +399,19 @@ static int netback_uevent(struct xenbus_device *xdev,
}
-static void backend_create_xenvif(struct backend_info *be)
+static int backend_create_xenvif(struct backend_info *be)
{
int err;
long handle;
struct xenbus_device *dev = be->dev;
if (be->vif != NULL)
- return;
+ return 0;
err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle);
if (err != 1) {
xenbus_dev_fatal(dev, err, "reading handle");
- return;
+ return (err < 0) ? err : -EINVAL;
}
be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
@@ -417,10 +419,11 @@ static void backend_create_xenvif(struct backend_info *be)
err = PTR_ERR(be->vif);
be->vif = NULL;
xenbus_dev_fatal(dev, err, "creating interface");
- return;
+ return err;
}
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
+ return 0;
}
static void backend_disconnect(struct backend_info *be)
--
1.7.10.4

188
debian/patches/bugfix/all/xen-netback-support-frontends-without-feature-rx-not.patch vendored Normal file
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@ -0,0 +1,188 @@
From 0baa6f7d5b0ed21b28768d151b1d74cb9b88dacf Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@citrix.com>
Date: Thu, 18 Dec 2014 11:13:06 +0000
Subject: [PATCH 4/4] xen-netback: support frontends without feature-rx-notify
again
Origin: https://git.kernel.org/linus/26c0e102585d5a4d311f5d6eb7f524d288e7f6b7
Commit bc96f648df1bbc2729abbb84513cf4f64273a1f1 (xen-netback: make
feature-rx-notify mandatory) incorrectly assumed that there were no
frontends in use that did not support this feature. But the frontend
driver in MiniOS does not and since this is used by (qemu) stubdoms,
these stopped working.
Netback sort of works as-is in this mode except:
- If there are no Rx requests and the internal Rx queue fills, only
the drain timeout will wake the thread. The default drain timeout
of 10 s would give unacceptable pauses.
- If an Rx stall was detected and the internal Rx queue is drained,
then the Rx thread would never wake.
Handle these two cases (when feature-rx-notify is disabled) by:
- Reducing the drain timeout to 30 ms.
- Disabling Rx stall detection.
Reported-by: John <jw@nuclearfallout.net>
Tested-by: John <jw@nuclearfallout.net>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/xen-netback/common.h | 4 +++-
drivers/net/xen-netback/interface.c | 4 +++-
drivers/net/xen-netback/netback.c | 27 ++++++++++++++-------------
drivers/net/xen-netback/xenbus.c | 12 +++++++++---
4 files changed, 29 insertions(+), 18 deletions(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 083ecc9..5f1fda4 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -230,6 +230,8 @@ struct xenvif {
*/
bool disabled;
unsigned long status;
+ unsigned long drain_timeout;
+ unsigned long stall_timeout;
/* Queues */
struct xenvif_queue *queues;
@@ -328,7 +330,7 @@ irqreturn_t xenvif_interrupt(int irq, void *dev_id);
extern bool separate_tx_rx_irq;
extern unsigned int rx_drain_timeout_msecs;
-extern unsigned int rx_drain_timeout_jiffies;
+extern unsigned int rx_stall_timeout_msecs;
extern unsigned int xenvif_max_queues;
#ifdef CONFIG_DEBUG_FS
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index ddcb757..af047c2 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -166,7 +166,7 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
goto drop;
cb = XENVIF_RX_CB(skb);
- cb->expires = jiffies + rx_drain_timeout_jiffies;
+ cb->expires = jiffies + vif->drain_timeout;
xenvif_rx_queue_tail(queue, skb);
xenvif_kick_thread(queue);
@@ -414,6 +414,8 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
vif->ip_csum = 1;
vif->dev = dev;
vif->disabled = false;
+ vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
+ vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
/* Start out with no queues. */
vif->queues = NULL;
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 6563f07..c39aace 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -60,14 +60,12 @@ module_param(separate_tx_rx_irq, bool, 0644);
*/
unsigned int rx_drain_timeout_msecs = 10000;
module_param(rx_drain_timeout_msecs, uint, 0444);
-unsigned int rx_drain_timeout_jiffies;
/* The length of time before the frontend is considered unresponsive
* because it isn't providing Rx slots.
*/
-static unsigned int rx_stall_timeout_msecs = 60000;
+unsigned int rx_stall_timeout_msecs = 60000;
module_param(rx_stall_timeout_msecs, uint, 0444);
-static unsigned int rx_stall_timeout_jiffies;
unsigned int xenvif_max_queues;
module_param_named(max_queues, xenvif_max_queues, uint, 0644);
@@ -2022,7 +2020,7 @@ static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)
return !queue->stalled
&& prod - cons < XEN_NETBK_RX_SLOTS_MAX
&& time_after(jiffies,
- queue->last_rx_time + rx_stall_timeout_jiffies);
+ queue->last_rx_time + queue->vif->stall_timeout);
}
static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)
@@ -2040,8 +2038,9 @@ static bool xenvif_have_rx_work(struct xenvif_queue *queue)
{
return (!skb_queue_empty(&queue->rx_queue)
&& xenvif_rx_ring_slots_available(queue, XEN_NETBK_RX_SLOTS_MAX))
- || xenvif_rx_queue_stalled(queue)
- || xenvif_rx_queue_ready(queue)
+ || (queue->vif->stall_timeout &&
+ (xenvif_rx_queue_stalled(queue)
+ || xenvif_rx_queue_ready(queue)))
|| kthread_should_stop()
|| queue->vif->disabled;
}
@@ -2094,6 +2093,9 @@ int xenvif_kthread_guest_rx(void *data)
struct xenvif_queue *queue = data;
struct xenvif *vif = queue->vif;
+ if (!vif->stall_timeout)
+ xenvif_queue_carrier_on(queue);
+
for (;;) {
xenvif_wait_for_rx_work(queue);
@@ -2120,10 +2122,12 @@ int xenvif_kthread_guest_rx(void *data)
* while it's probably not responsive, drop the
* carrier so packets are dropped earlier.
*/
- if (xenvif_rx_queue_stalled(queue))
- xenvif_queue_carrier_off(queue);
- else if (xenvif_rx_queue_ready(queue))
- xenvif_queue_carrier_on(queue);
+ if (vif->stall_timeout) {
+ if (xenvif_rx_queue_stalled(queue))
+ xenvif_queue_carrier_off(queue);
+ else if (xenvif_rx_queue_ready(queue))
+ xenvif_queue_carrier_on(queue);
+ }
/* Queued packets may have foreign pages from other
* domains. These cannot be queued indefinitely as
@@ -2194,9 +2198,6 @@ static int __init netback_init(void)
if (rc)
goto failed_init;
- rx_drain_timeout_jiffies = msecs_to_jiffies(rx_drain_timeout_msecs);
- rx_stall_timeout_jiffies = msecs_to_jiffies(rx_stall_timeout_msecs);
-
#ifdef CONFIG_DEBUG_FS
xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL);
if (IS_ERR_OR_NULL(xen_netback_dbg_root))
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index cc8f8ba..60f7c7d 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -887,9 +887,15 @@ static int read_xenbus_vif_flags(struct backend_info *be)
return -EOPNOTSUPP;
if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-rx-notify", "%d", &val) < 0 || val == 0) {
- xenbus_dev_fatal(dev, -EINVAL, "feature-rx-notify is mandatory");
- return -EINVAL;
+ "feature-rx-notify", "%d", &val) < 0)
+ val = 0;
+ if (!val) {
+ /* - Reduce drain timeout to poll more frequently for
+ * Rx requests.
+ * - Disable Rx stall detection.
+ */
+ be->vif->drain_timeout = msecs_to_jiffies(30);
+ be->vif->stall_timeout = 0;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
--
1.7.10.4

4
debian/patches/series vendored
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@ -157,6 +157,10 @@ bugfix/all/xen-netback-move-netif_napi_add-before-binding-inter.patch
bugfix/all/xen-netback-make-feature-rx-notify-mandatory.patch
bugfix/all/xen-netback-fix-unlimited-guest-Rx-internal-queue-an.patch
bugfix/all/xen-netback-reintroduce-guest-Rx-stall-detection.patch
bugfix/all/xen-netback-Disable-NAPI-after-disabling-interrupts.patch
bugfix/all/xen-netback-do-not-report-success-if-backend_create_.patch
bugfix/all/netback-don-t-store-invalid-vif-pointer.patch
bugfix/all/xen-netback-support-frontends-without-feature-rx-not.patch
bugfix/all/of-fdt-memblock_reserve-memreserve-regions-in-the-ca.patch
# memfd_create() & kdbus backport