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Message-Id: <1433460376-9387-10-git-send-email-kys@microsoft.com>
Date: Thu, 4 Jun 2015 16:26:16 -0700
From: "K. Y. Srinivasan" <kys@...rosoft.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
vkuznets@...hat.com, jasowang@...hat.com
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V2 10/10] Drivers: hv: vmbus: Permit sending of packets without payload
The guest may have to send a completion packet back to the host.
To support this usage, permit sending a packet without a payload -
we would be only sending the descriptor in this case.
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
drivers/hv/channel.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 603ce97..c4dcab0 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -601,6 +601,7 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
u64 aligned_data = 0;
int ret;
bool signal = false;
+ int num_vecs = ((bufferlen != 0) ? 3 : 1);
/* Setup the descriptor */
@@ -618,7 +619,8 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
bufferlist[2].iov_base = &aligned_data;
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
- ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
+ ret = hv_ringbuffer_write(&channel->outbound, bufferlist, num_vecs,
+ &signal);
/*
* Signalling the host is conditional on many factors:
--
1.7.4.1
--
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