On Mon, Feb 2, 2015 at 12:36 PM, Dexuan Cui <decui@xxxxxxxxxxxxx> wrote:
I got HV_STATUS_INVALID_CONNECTION_ID on Hyper-V 2008 R2 when keeping
running
"rmmod hv_netvsc; modprobe hv_netvsc; rmmod hv_utils; modprobe
hv_utils"
in a Linux guest. Looks the host has some kind of throttling
mechanism if
some kinds of hypercalls are sent too frequently.
Better to clarify this kind of throttling. Looks like it only affects
HVCALL_POST_MESSAGE. Other looks good.
Reviewed-by: Jason Wang <jasowang@xxxxxxxxxx>
Without the patch, the driver can occasionally fail to load.
Also let's retry HV_STATUS_INSUFFICIENT_MEMORY, though we didn't get
it
before.
Removed 'case -ENOMEM', since the hypervisor doesn't return this.
CC: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
---
v2:
updated the subject and changelog
on HV_STATUS_INVALID_CONNECTION_ID: ret = -EAGAIN;
added HV_STATUS_INSUFFICIENT_MEMORY
removed unreachable -ENOMEM
changed the delay from 100ms to 1000ms
arch/x86/include/uapi/asm/hyperv.h | 2 ++
drivers/hv/connection.c | 11 +++++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/uapi/asm/hyperv.h
b/arch/x86/include/uapi/asm/hyperv.h
index 90c458e..ce6068d 100644
--- a/arch/x86/include/uapi/asm/hyperv.h
+++ b/arch/x86/include/uapi/asm/hyperv.h
@@ -225,6 +225,8 @@
#define HV_STATUS_INVALID_HYPERCALL_CODE 2
#define HV_STATUS_INVALID_HYPERCALL_INPUT 3
#define HV_STATUS_INVALID_ALIGNMENT 4
+#define HV_STATUS_INSUFFICIENT_MEMORY 11
+#define HV_STATUS_INVALID_CONNECTION_ID 18
#define HV_STATUS_INSUFFICIENT_BUFFERS 19
typedef struct _HV_REFERENCE_TSC_PAGE {
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index c4acd1c..af2388f 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -440,9 +440,16 @@ int vmbus_post_msg(void *buffer, size_t buflen)
ret = hv_post_message(conn_id, 1, buffer, buflen);
switch (ret) {
+ case HV_STATUS_INVALID_CONNECTION_ID:
+ /*
+ * We could get this if we send messages too
+ * frequently.
+ */
+ ret = -EAGAIN;
+ break;
+ case HV_STATUS_INSUFFICIENT_MEMORY:
case HV_STATUS_INSUFFICIENT_BUFFERS:
ret = -ENOMEM;
- case -ENOMEM:
break;
case HV_STATUS_SUCCESS:
return ret;
@@ -452,7 +459,7 @@ int vmbus_post_msg(void *buffer, size_t buflen)
}
retries++;
- msleep(100);
+ msleep(1000);
}
return ret;
}
--
1.9.1
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
