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Drivers: hv: vmbus: Enable explicit signaling policy for NIC channels

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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>
This commit is contained in:
K. Y. Srinivasan 2016-07-01 16:26:35 -07:00 committed by Greg Kroah-Hartman
parent 638fea33ae
commit ccef9bcc02
4 changed files with 20 additions and 18 deletions
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18
drivers/hv/channel.c
View File

@ -650,7 +650,7 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, num_vecs,
&signal, lock);
&signal, lock, channel->signal_policy);
/*
* Signalling the host is conditional on many factors:
@ -671,11 +671,6 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
* mechanism which can hurt the performance otherwise.
*/
if (channel->signal_policy)
signal = true;
else
kick_q = true;
if (((ret == 0) && kick_q && signal) ||
(ret && !is_hvsock_channel(channel)))
vmbus_setevent(channel);
@ -768,7 +763,7 @@ int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3,
&signal, lock);
&signal, lock, channel->signal_policy);
/*
* Signalling the host is conditional on many factors:
@ -786,11 +781,6 @@ int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
* enough condition that it should not matter.
*/
if (channel->signal_policy)
signal = true;
else
kick_q = true;
if (((ret == 0) && kick_q && signal) || (ret))
vmbus_setevent(channel);
@ -852,7 +842,7 @@ int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3,
&signal, lock);
&signal, lock, channel->signal_policy);
if (ret == 0 && signal)
vmbus_setevent(channel);
@ -917,7 +907,7 @@ int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3,
&signal, lock);
&signal, lock, channel->signal_policy);
if (ret == 0 && signal)
vmbus_setevent(channel);

2
drivers/hv/channel_mgmt.c
View File

@ -426,6 +426,8 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
}
dev_type = hv_get_dev_type(&newchannel->offermsg.offer.if_type);
if (dev_type == HV_NIC)
set_channel_signal_state(newchannel, HV_SIGNAL_POLICY_EXPLICIT);
init_vp_index(newchannel, dev_type);

3
drivers/hv/hyperv_vmbus.h
View File

@ -529,7 +529,8 @@ void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
struct kvec *kv_list,
u32 kv_count, bool *signal, bool lock);
u32 kv_count, bool *signal, bool lock,
enum hv_signal_policy policy);
int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info,
void *buffer, u32 buflen, u32 *buffer_actual_len,

15
drivers/hv/ring_buffer.c
View File

@ -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;
}