net/hyperv: Add NETVSP protocol version negotiation

Automatically negotiate the highest protocol version mutually recognized by
both host and guest.

Signed-off-by: Haiyang Zhang <[e-mail]>
Signed-off-by: K. Y. Srinivasan <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/net/hyperv/hyperv_net.h

···
 #define NVSP_INVALID_PROTOCOL_VERSION	((u32)0xFFFFFFFF)
 
 #define NVSP_PROTOCOL_VERSION_1		2
-#define NVSP_MIN_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1
-#define NVSP_MAX_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1
+#define NVSP_PROTOCOL_VERSION_2		0x30002
 
 enum {
 	NVSP_MSG_TYPE_NONE = 0,
···
 	NVSP_MSG1_TYPE_SEND_RNDIS_PKT,
 	NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
 
-	/*
-	 * This should be set to the number of messages for the version with
-	 * the maximum number of messages.
-	 */
-	NVSP_NUM_MSG_PER_VERSION		= 9,
+	/* Version 2 messages */
+	NVSP_MSG2_TYPE_SEND_CHIMNEY_DELEGATED_BUF,
+	NVSP_MSG2_TYPE_SEND_CHIMNEY_DELEGATED_BUF_COMP,
+	NVSP_MSG2_TYPE_REVOKE_CHIMNEY_DELEGATED_BUF,
+
+	NVSP_MSG2_TYPE_RESUME_CHIMNEY_RX_INDICATION,
+
+	NVSP_MSG2_TYPE_TERMINATE_CHIMNEY,
+	NVSP_MSG2_TYPE_TERMINATE_CHIMNEY_COMP,
+
+	NVSP_MSG2_TYPE_INDICATE_CHIMNEY_EVENT,
+
+	NVSP_MSG2_TYPE_SEND_CHIMNEY_PKT,
+	NVSP_MSG2_TYPE_SEND_CHIMNEY_PKT_COMP,
+
+	NVSP_MSG2_TYPE_POST_CHIMNEY_RECV_REQ,
+	NVSP_MSG2_TYPE_POST_CHIMNEY_RECV_REQ_COMP,
+
+	NVSP_MSG2_TYPE_ALLOC_RXBUF,
+	NVSP_MSG2_TYPE_ALLOC_RXBUF_COMP,
+
+	NVSP_MSG2_TYPE_FREE_RXBUF,
+
+	NVSP_MSG2_TYPE_SEND_VMQ_RNDIS_PKT,
+	NVSP_MSG2_TYPE_SEND_VMQ_RNDIS_PKT_COMP,
+
+	NVSP_MSG2_TYPE_SEND_NDIS_CONFIG,
+
+	NVSP_MSG2_TYPE_ALLOC_CHIMNEY_HANDLE,
+	NVSP_MSG2_TYPE_ALLOC_CHIMNEY_HANDLE_COMP,
 };
 
 enum {
···
 	NVSP_STAT_PROTOCOL_TOO_OLD,
 	NVSP_STAT_INVALID_RNDIS_PKT,
 	NVSP_STAT_BUSY,
+	NVSP_STAT_PROTOCOL_UNSUPPORTED,
 	NVSP_STAT_MAX,
 };
 
···
 						send_rndis_pkt_complete;
 } __packed;
 
+
+/*
+ * Network VSP protocol version 2 messages:
+ */
+struct nvsp_2_vsc_capability {
+	union {
+		u64 data;
+		struct {
+			u64 vmq:1;
+			u64 chimney:1;
+			u64 sriov:1;
+			u64 ieee8021q:1;
+			u64 correlation_id:1;
+		};
+	};
+} __packed;
+
+struct nvsp_2_send_ndis_config {
+	u32 mtu;
+	u32 reserved;
+	struct nvsp_2_vsc_capability capability;
+} __packed;
+
+/* Allocate receive buffer */
+struct nvsp_2_alloc_rxbuf {
+	/* Allocation ID to match the allocation request and response */
+	u32 alloc_id;
+
+	/* Length of the VM shared memory receive buffer that needs to
+	 * be allocated
+	 */
+	u32 len;
+} __packed;
+
+/* Allocate receive buffer complete */
+struct nvsp_2_alloc_rxbuf_comp {
+	/* The NDIS_STATUS code for buffer allocation */
+	u32 status;
+
+	u32 alloc_id;
+
+	/* GPADL handle for the allocated receive buffer */
+	u32 gpadl_handle;
+
+	/* Receive buffer ID */
+	u64 recv_buf_id;
+} __packed;
+
+struct nvsp_2_free_rxbuf {
+	u64 recv_buf_id;
+} __packed;
+
+union nvsp_2_message_uber {
+	struct nvsp_2_send_ndis_config send_ndis_config;
+	struct nvsp_2_alloc_rxbuf alloc_rxbuf;
+	struct nvsp_2_alloc_rxbuf_comp alloc_rxbuf_comp;
+	struct nvsp_2_free_rxbuf free_rxbuf;
+} __packed;
+
 union nvsp_all_messages {
 	union nvsp_message_init_uber init_msg;
 	union nvsp_1_message_uber v1_msg;
+	union nvsp_2_message_uber v2_msg;
 } __packed;
 
 /* ALL Messages */
···
 /* Per netvsc channel-specific */
 struct netvsc_device {
 	struct hv_device *dev;
+
+	u32 nvsp_version;
 
 	atomic_t num_outstanding_sends;
 	bool destroy;

drivers/net/hyperv/netvsc.c

···
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/netdevice.h>
+#include <linux/if_ether.h>
 
 #include "hyperv_net.h"
 
···
 }
 
 
-static int netvsc_connect_vsp(struct hv_device *device)
+/* Negotiate NVSP protocol version */
+static int negotiate_nvsp_ver(struct hv_device *device,
+			      struct netvsc_device *net_device,
+			      struct nvsp_message *init_packet,
+			      u32 nvsp_ver)
 {
 	int ret, t;
+
+	memset(init_packet, 0, sizeof(struct nvsp_message));
+	init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
+	init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
+	init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
+
+	/* Send the init request */
+	ret = vmbus_sendpacket(device->channel, init_packet,
+			       sizeof(struct nvsp_message),
+			       (unsigned long)init_packet,
+			       VM_PKT_DATA_INBAND,
+			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+	if (ret != 0)
+		return ret;
+
+	t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
+
+	if (t == 0)
+		return -ETIMEDOUT;
+
+	if (init_packet->msg.init_msg.init_complete.status !=
+	    NVSP_STAT_SUCCESS)
+		return -EINVAL;
+
+	if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
+		return 0;
+
+	/* NVSPv2 only: Send NDIS config */
+	memset(init_packet, 0, sizeof(struct nvsp_message));
+	init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
+	init_packet->msg.v2_msg.send_ndis_config.mtu = ETH_DATA_LEN;
+
+	ret = vmbus_sendpacket(device->channel, init_packet,
+				sizeof(struct nvsp_message),
+				(unsigned long)init_packet,
+				VM_PKT_DATA_INBAND, 0);
+
+	return ret;
+}
+
+static int netvsc_connect_vsp(struct hv_device *device)
+{
+	int ret;
 	struct netvsc_device *net_device;
 	struct nvsp_message *init_packet;
 	int ndis_version;
···
 
 	init_packet = &net_device->channel_init_pkt;
 
-	memset(init_packet, 0, sizeof(struct nvsp_message));
-	init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
-	init_packet->msg.init_msg.init.min_protocol_ver =
-		NVSP_MIN_PROTOCOL_VERSION;
-	init_packet->msg.init_msg.init.max_protocol_ver =
-		NVSP_MAX_PROTOCOL_VERSION;
-
-	/* Send the init request */
-	ret = vmbus_sendpacket(device->channel, init_packet,
-			       sizeof(struct nvsp_message),
-			       (unsigned long)init_packet,
-			       VM_PKT_DATA_INBAND,
-			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-
-	if (ret != 0)
-		goto cleanup;
-
-	t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
-
-	if (t == 0) {
-		ret = -ETIMEDOUT;
-		goto cleanup;
-	}
-
-	if (init_packet->msg.init_msg.init_complete.status !=
-	    NVSP_STAT_SUCCESS) {
-		ret = -EINVAL;
-		goto cleanup;
-	}
-
-	if (init_packet->msg.init_msg.init_complete.
-	    negotiated_protocol_ver != NVSP_PROTOCOL_VERSION_1) {
+	/* Negotiate the latest NVSP protocol supported */
+	if (negotiate_nvsp_ver(device, net_device, init_packet,
+			       NVSP_PROTOCOL_VERSION_2) == 0) {
+		net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
+	} else if (negotiate_nvsp_ver(device, net_device, init_packet,
+				    NVSP_PROTOCOL_VERSION_1) == 0) {
+		net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
+	} else {
 		ret = -EPROTO;
 		goto cleanup;
 	}
+
+	pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
+
 	/* Send the ndis version */
 	memset(init_packet, 0, sizeof(struct nvsp_message));