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Drivers: hv: vmbus: Suport an API to send pagebuffers with additional control

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Implement an API for sending pagebuffers that gives more control to the client
in terms of setting the vmbus flags as well as deciding when to
notify the host. This will be useful for enabling batch processing.

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 2015-02-28 11:39:03 -08:00 committed by Greg Kroah-Hartman
parent a13e8bbe85
commit 87e93d6170
2 changed files with 36 additions and 6 deletions
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33
drivers/hv/channel.c
View file

@ -636,13 +636,18 @@ int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
EXPORT_SYMBOL(vmbus_sendpacket);
/*
* vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
* packets using a GPADL Direct packet type.
* vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer
* packets using a GPADL Direct packet type. This interface allows you
* to control notifying the host. This will be useful for sending
* batched data. Also the sender can control the send flags
* explicitly.
*/
int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount, void *buffer, u32 bufferlen,
u64 requestid)
u64 requestid,
u32 flags,
bool kick_q)
{
int ret;
int i;
@ -670,7 +675,7 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
/* Setup the descriptor */
desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
desc.flags = flags;
desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
desc.length8 = (u16)(packetlen_aligned >> 3);
desc.transactionid = requestid;
@ -691,11 +696,27 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
if (ret == 0 && signal)
if ((ret == 0) && kick_q && signal)
vmbus_setevent(channel);
return ret;
}
/*
* vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
* packets using a GPADL Direct packet type.
*/
int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount, void *buffer, u32 bufferlen,
u64 requestid)
{
u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount,
buffer, bufferlen, requestid,
flags, true);
}
EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
/*

9
include/linux/hyperv.h
View file

@ -874,6 +874,15 @@ extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
u32 bufferlen,
u64 requestid);
extern int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount,
void *buffer,
u32 bufferlen,
u64 requestid,
u32 flags,
bool kick_q);
extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
struct hv_multipage_buffer *mpb,
void *buffer,