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| author | K. Y. Srinivasan <kys@microsoft.com> | 2016-07-02 01:26:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 13:05:41 +0200 |
| commit | ccef9bcc02ee63ac171ea9f0d51e04b3e55b3a12 (patch) | |
| tree | 90726ee1cfee006f7c79c459c61fc43892e3e732 /drivers/hv/ring_buffer.c | |
| parent | Drivers: hv: vmbus: fix the race when querying & updating the percpu list (diff) | |
| download | linux-ccef9bcc02ee63ac171ea9f0d51e04b3e55b3a12.tar.xz linux-ccef9bcc02ee63ac171ea9f0d51e04b3e55b3a12.zip | |
Drivers: hv: vmbus: Enable explicit signaling policy for NIC channels
For synthetic NIC channels, enable explicit signaling policy as netvsc wants to
explicitly control when the host is to be signaled.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/ring_buffer.c')
| -rw-r--r-- | drivers/hv/ring_buffer.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index fe586bf74e17..e3edcaee7ab3 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -66,12 +66,20 @@ u32 hv_end_read(struct hv_ring_buffer_info *rbi) * arrived. */ -static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi) +static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi, + enum hv_signal_policy policy) { virt_mb(); if (READ_ONCE(rbi->ring_buffer->interrupt_mask)) return false; + /* + * When the client wants to control signaling, + * we only honour the host interrupt mask. + */ + if (policy == HV_SIGNAL_POLICY_EXPLICIT) + return true; + /* check interrupt_mask before read_index */ virt_rmb(); /* @@ -264,7 +272,8 @@ void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info) /* Write to the ring buffer. */ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info, - struct kvec *kv_list, u32 kv_count, bool *signal, bool lock) + struct kvec *kv_list, u32 kv_count, bool *signal, bool lock, + enum hv_signal_policy policy) { int i = 0; u32 bytes_avail_towrite; @@ -326,7 +335,7 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info, if (lock) spin_unlock_irqrestore(&outring_info->ring_lock, flags); - *signal = hv_need_to_signal(old_write, outring_info); + *signal = hv_need_to_signal(old_write, outring_info, policy); return 0; } |