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Subject[PATCH 13/40] Staging: hv: netvsc: Introduce code to properly manage outstanding sends
Date
Introduce code to properly manage outstanding sends.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
drivers/staging/hv/hyperv_net.h | 10 ++++++++++
drivers/staging/hv/netvsc.c | 6 +++++-
2 files changed, 15 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/hv/hyperv_net.h b/drivers/staging/hv/hyperv_net.h
index 5782fea..b5bee9e 100644
--- a/drivers/staging/hv/hyperv_net.h
+++ b/drivers/staging/hv/hyperv_net.h
@@ -371,6 +371,8 @@ struct netvsc_device {

atomic_t refcnt;
atomic_t num_outstanding_sends;
+ bool drain_notify;
+ wait_queue_head_t waiting_to_drain;
/*
* List of free preallocated hv_netvsc_packet to represent receive
* packet
@@ -1051,6 +1053,14 @@ struct rndis_filter_packet {
#define NDIS_PACKET_TYPE_FUNCTIONAL 0x00000400
#define NDIS_PACKET_TYPE_MAC_FRAME 0x00000800

+static inline void netvsc_wait_to_drain(struct netvsc_device *dev)
+{
+ dev->drain_notify = true;
+ wait_event(dev->waiting_to_drain,
+ atomic_read(&dev->num_outstanding_sends) == 0);
+ dev->drain_notify = false;
+}
+


#endif /* _HYPERV_NET_H */
diff --git a/drivers/staging/hv/netvsc.c b/drivers/staging/hv/netvsc.c
index 551537a..bdd5c2b 100644
--- a/drivers/staging/hv/netvsc.c
+++ b/drivers/staging/hv/netvsc.c
@@ -42,6 +42,8 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)

/* Set to 2 to allow both inbound and outbound traffic */
atomic_cmpxchg(&net_device->refcnt, 0, 2);
+ net_device->drain_notify = false;
+ init_waitqueue_head(&net_device->waiting_to_drain);

net_device->dev = device;
device->ext = net_device;
@@ -483,7 +485,9 @@ static void netvsc_send_completion(struct hv_device *device,
nvsc_packet->completion.send.send_completion(
nvsc_packet->completion.send.send_completion_ctx);

- atomic_dec(&net_device->num_outstanding_sends);
+ if (atomic_dec_and_test(&net_device->num_outstanding_sends) &&
+ net_device->drain_notify)
+ wake_up(&net_device->waiting_to_drain);
} else {
netdev_err(ndev, "Unknown send completion packet type- "
"%d received!!\n", nvsp_packet->hdr.msg_type);
--
1.7.4.1


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