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Message-Id: <1436867936-17765-1-git-send-email-decui@microsoft.com>
Date: Tue, 14 Jul 2015 02:58:56 -0700
From: Dexuan Cui <decui@...rosoft.com>
To: gregkh@...uxfoundation.org, davem@...emloft.net,
stephen@...workplumber.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
driverdev-devel@...uxdriverproject.org, olaf@...fle.de,
apw@...onical.com, jasowang@...hat.com, kys@...rosoft.com
Subject: [V2 3/7] Drivers: hv: vmbus: add APIs to send/recv hvsock packet and get the r/w-ability
This will be used by the coming net/hvsock driver.
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
---
drivers/hv/channel.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/hv/hyperv_vmbus.h | 4 ++
drivers/hv/ring_buffer.c | 14 +++++
include/linux/hyperv.h | 33 ++++++++++++
4 files changed, 182 insertions(+)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index b09d1b7..9c3727a 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -758,6 +758,53 @@ int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl);
/*
+ * vmbus_sendpacket_hvsock - Send the hvsock payload 'buf' into the vmbus
+ * ringbuffer
+ */
+int vmbus_sendpacket_hvsock(struct vmbus_channel *channel, void *buf, u32 len)
+{
+ struct vmpacket_descriptor desc;
+ struct vmpipe_proto_header pipe_hdr;
+ u32 packetlen;
+ u32 packetlen_aligned;
+ struct kvec bufferlist[4];
+ u64 aligned_data = 0;
+ int ret;
+ bool signal = false;
+
+ 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(vmbus_sendpacket_hvsock);
+
+/*
* vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
* packets using a GPADL Direct packet type.
*/
@@ -978,3 +1025,87 @@ int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
return ret;
}
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)
+{
+ struct vmpacket_descriptor *desc;
+ struct vmpipe_proto_header *pipe_hdr;
+ u32 packet_len, payload_len;
+ int ret;
+ bool signal = false;
+
+ *buffer_actual_len = 0;
+
+ if (bufferlen < HVSOCK_HEADER_LEN)
+ return -ENOBUFS;
+
+ ret = hv_ringbuffer_peek(&channel->inbound, buffer,
+ HVSOCK_HEADER_LEN);
+ if (ret != 0)
+ return 0;
+
+ desc = (struct vmpacket_descriptor *)buffer;
+ packet_len = desc->len8 << 3;
+ if (desc->type != VM_PKT_DATA_INBAND ||
+ desc->offset8 != (sizeof(*desc) / 8) ||
+ packet_len < HVSOCK_HEADER_LEN)
+ return -EIO;
+
+ pipe_hdr = (struct vmpipe_proto_header *)(desc + 1);
+ payload_len = pipe_hdr->data_size;
+
+ if (pipe_hdr->pkt_type != 1 || payload_len == 0)
+ return -EIO;
+
+ if (HVSOCK_PKT_LEN(payload_len) != packet_len + PREV_INDICES_LEN)
+ return -EIO;
+
+ if (bufferlen < packet_len - HVSOCK_HEADER_LEN)
+ return -ENOBUFS;
+
+ /* Copy over the hvsock payload to the user buffer */
+ ret = hv_ringbuffer_read(&channel->inbound, buffer,
+ packet_len - HVSOCK_HEADER_LEN,
+ HVSOCK_HEADER_LEN, &signal);
+ if (ret != 0)
+ return ret;
+
+ *buffer_actual_len = payload_len;
+
+ if (signal)
+ vmbus_setevent(channel);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vmbus_recvpacket_hvsock);
+
+/*
+ * vmbus_get_hvsock_rw_status - can the ringbuffer be read/written?
+ */
+void vmbus_get_hvsock_rw_status(struct vmbus_channel *channel,
+ bool *can_read, bool *can_write)
+{
+ u32 avl_read_bytes, avl_write_bytes, dummy;
+
+ if (can_read != NULL) {
+ hv_get_ringbuffer_space(&channel->inbound, &avl_read_bytes,
+ &dummy);
+ *can_read = avl_read_bytes >= HVSOCK_MIN_PKT_LEN;
+ }
+
+ /* We write into the ringbuffer only when we're able to write a
+ * a payload of 4096 bytes (the actual written payload's length may be
+ * less than 4096).
+ */
+ if (can_write != NULL) {
+ hv_get_ringbuffer_space(&channel->outbound, &dummy,
+ &avl_write_bytes);
+ *can_write = avl_write_bytes > HVSOCK_PKT_LEN(PAGE_SIZE);
+ }
+}
+EXPORT_SYMBOL_GPL(vmbus_get_hvsock_rw_status);
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index cddc0c9..d1787d0 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -608,6 +608,10 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
u32 buflen);
+void hv_get_ringbuffer_space(struct hv_ring_buffer_info *inring_info,
+ u32 *bytes_avail_toread,
+ u32 *bytes_avail_towrite);
+
int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
void *buffer,
u32 buflen,
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 6361d12..250d4ab 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -501,6 +501,20 @@ int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
return 0;
}
+void hv_get_ringbuffer_space(struct hv_ring_buffer_info *inring_info,
+ u32 *bytes_avail_toread,
+ u32 *bytes_avail_towrite)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&inring_info->ring_lock, flags);
+
+ hv_get_ringbuffer_availbytes(inring_info,
+ bytes_avail_toread,
+ bytes_avail_towrite);
+
+ spin_unlock_irqrestore(&inring_info->ring_lock, flags);
+}
/*
*
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 8799948..1e4c58e 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -885,6 +885,9 @@ 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,
@@ -934,6 +937,11 @@ extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
u32 *buffer_actual_len,
u64 *requestid);
+extern int vmbus_recvpacket_hvsock(struct vmbus_channel *channel, void *buffer,
+ u32 bufferlen, u32 *buffer_actual_len);
+
+extern void vmbus_get_hvsock_rw_status(struct vmbus_channel *channel,
+ bool *can_read, bool *can_write);
extern void vmbus_ontimer(unsigned long data);
@@ -1261,4 +1269,29 @@ extern __u32 vmbus_proto_version;
int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
const uuid_le *shv_host_servie_id);
+
+struct vmpipe_proto_header {
+ u32 pkt_type;
+
+ union {
+ u32 data_size;
+ struct {
+ u16 data_size;
+ u16 offset;
+ } partial;
+ };
+} __packed;
+
+/* see hv_ringbuffer_read() and hv_ringbuffer_write() */
+#define PREV_INDICES_LEN (sizeof(u64))
+
+#define HVSOCK_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \
+ sizeof(struct vmpipe_proto_header))
+
+#define HVSOCK_PKT_LEN(payload_len) (HVSOCK_HEADER_LEN + \
+ ALIGN((payload_len), 8) + \
+ PREV_INDICES_LEN)
+
+#define HVSOCK_MIN_PKT_LEN HVSOCK_PKT_LEN(1)
+
#endif /* _HYPERV_H */
--
2.1.0
--
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