Dexuan Cui <decui@xxxxxxxxxxxxx> writes:
> 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);
Using ARRAY_SIZE(bufferlist) instead of 4 would allow us to keep this
line untouched when we decide to add something (and compiler will
optimize it to 4 anyway).
> +
> + 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 */
--
Vitaly
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