This will be used by the coming net/hvsock driver.
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
---
drivers/hv/channel.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/hyperv.h | 9 ++++++++
2 files changed, 68 insertions(+)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index cc49966..ce1b885 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -924,6 +924,52 @@ int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
}
EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
+/*
+ * vmbus_sendpacket_hvsock - Send the hvsock payload 'buf' of a length 'len'
+ */
+int vmbus_sendpacket_hvsock(struct vmbus_channel *channel, void *buf, u32 len)
+{
+ struct vmpipe_proto_header pipe_hdr;
+ struct vmpacket_descriptor desc;
+ struct kvec bufferlist[4];
+ u32 packetlen_aligned;
+ u32 packetlen;
+ u64 aligned_data = 0;
+ bool signal = false;
+ int ret;
+
+ packetlen = HVSOCK_HEADER_LEN + len;
+ packetlen_aligned = ALIGN(packetlen, sizeof(u64));
+
+ /* Setup the descriptor */
+ desc.type = VM_PKT_DATA_INBAND;
+ /* in 8-bytes granularity */
+ desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
+ desc.len8 = (u16)(packetlen_aligned >> 3);
+ desc.flags = 0;
+ desc.trans_id = 0;
+
+ pipe_hdr.pkt_type = 1;
+ pipe_hdr.data_size = len;
+
+ bufferlist[0].iov_base = &desc;
+ bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor);
+ bufferlist[1].iov_base = &pipe_hdr;
+ bufferlist[1].iov_len = sizeof(struct vmpipe_proto_header);
+ bufferlist[2].iov_base = buf;
+ bufferlist[2].iov_len = len;
+ bufferlist[3].iov_base = &aligned_data;
+ bufferlist[3].iov_len = packetlen_aligned - packetlen;
+
+ ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 4, &signal);
+
+ if (ret == 0 && signal)
+ vmbus_setevent(channel);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vmbus_sendpacket_hvsock);
+
/**
* vmbus_recvpacket() - Retrieve the user packet on the specified channel
* @channel: Pointer to vmbus_channel structure.
@@ -976,3 +1022,16 @@ int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
HV_RINGBUFFER_READ_FLAG_RAW);
}
EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
+
+/*
+ * vmbus_recvpacket_hvsock - Receive the hvsock payload from the vmbus
+ * ringbuffer into the 'buffer'.
+ */
+int vmbus_recvpacket_hvsock(struct vmbus_channel *channel, void *buffer,
+ u32 bufferlen, u32 *buffer_actual_len)
+{
+ return __vmbus_recvpacket(channel, buffer, bufferlen,
+ buffer_actual_len, NULL,
+ HV_RINGBUFFER_READ_FLAG_HVSOCK);
+}
+EXPORT_SYMBOL_GPL(vmbus_recvpacket_hvsock);
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e005223..646c20d 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -908,6 +908,9 @@ extern int vmbus_sendpacket_ctl(struct vmbus_channel *channel,
u32 flags,
bool kick_q);
+extern int vmbus_sendpacket_hvsock(struct vmbus_channel *channel,
+ void *buf, u32 len);
+
extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount,
@@ -958,6 +961,9 @@ extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
u64 *requestid);
+extern int vmbus_recvpacket_hvsock(struct vmbus_channel *channel, void *buffer,
+ u32 bufferlen, u32 *buffer_actual_len);
+
extern void vmbus_ontimer(unsigned long data);
/* Base driver object */
@@ -1280,4 +1286,7 @@ struct vmpipe_proto_header {
};
} __packed;
+#define HVSOCK_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \
+ sizeof(struct vmpipe_proto_header))
+
#endif /* _HYPERV_H */
--
2.1.4
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