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Commit ccef9bcc authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

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: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 638fea33

drivers/hv/channel.c

+4 −14
Original line number Diff line number Diff line
@@ -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);

drivers/hv/channel_mgmt.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

drivers/hv/hyperv_vmbus.h

+2 −1
Original line number Diff line number Diff line
@@ -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,

drivers/hv/ring_buffer.c

+12 −3
Original line number Diff line number Diff line
@@ -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;

}