drivers: net: ethernet: qualcomm: rmnet: Initial implementation

RmNet driver provides a transport agnostic MAP (multiplexing and
aggregation protocol) support in embedded module. Module provides
virtual network devices which can be attached to any IP-mode
physical device. This will be used to provide all MAP functionality
on future hardware in a single consistent location.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 88 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
new file mode 100644
index 000000000000..2aabad289b10
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -0,0 +1,88 @@
+/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _RMNET_MAP_H_
+#define _RMNET_MAP_H_
+
+struct rmnet_map_control_command {
+	u8  command_name;
+	u8  cmd_type:2;
+	u8  reserved:6;
+	u16 reserved2;
+	u32 transaction_id;
+	union {
+		struct {
+			u16 ip_family:2;
+			u16 reserved:14;
+			u16 flow_control_seq_num;
+			u32 qos_id;
+		} flow_control;
+		u8 data[0];
+	};
+}  __aligned(1);
+
+enum rmnet_map_results {
+	RMNET_MAP_SUCCESS,
+	RMNET_MAP_CONSUMED,
+	RMNET_MAP_GENERAL_FAILURE,
+	RMNET_MAP_NOT_ENABLED,
+	RMNET_MAP_FAILED_AGGREGATION,
+	RMNET_MAP_FAILED_MUX
+};
+
+enum rmnet_map_commands {
+	RMNET_MAP_COMMAND_NONE,
+	RMNET_MAP_COMMAND_FLOW_DISABLE,
+	RMNET_MAP_COMMAND_FLOW_ENABLE,
+	/* These should always be the last 2 elements */
+	RMNET_MAP_COMMAND_UNKNOWN,
+	RMNET_MAP_COMMAND_ENUM_LENGTH
+};
+
+struct rmnet_map_header {
+	u8  pad_len:6;
+	u8  reserved_bit:1;
+	u8  cd_bit:1;
+	u8  mux_id;
+	u16 pkt_len;
+}  __aligned(1);
+
+#define RMNET_MAP_GET_MUX_ID(Y) (((struct rmnet_map_header *) \
+				 (Y)->data)->mux_id)
+#define RMNET_MAP_GET_CD_BIT(Y) (((struct rmnet_map_header *) \
+				(Y)->data)->cd_bit)
+#define RMNET_MAP_GET_PAD(Y) (((struct rmnet_map_header *) \
+				(Y)->data)->pad_len)
+#define RMNET_MAP_GET_CMD_START(Y) ((struct rmnet_map_control_command *) \
+				    ((Y)->data + \
+				      sizeof(struct rmnet_map_header)))
+#define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
+					(Y)->data)->pkt_len))
+
+#define RMNET_MAP_COMMAND_REQUEST     0
+#define RMNET_MAP_COMMAND_ACK         1
+#define RMNET_MAP_COMMAND_UNSUPPORTED 2
+#define RMNET_MAP_COMMAND_INVALID     3
+
+#define RMNET_MAP_NO_PAD_BYTES        0
+#define RMNET_MAP_ADD_PAD_BYTES       1
+
+u8 rmnet_map_demultiplex(struct sk_buff *skb);
+struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
+				      struct rmnet_real_dev_info *rdinfo);
+
+struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
+						  int hdrlen, int pad);
+rx_handler_result_t rmnet_map_command(struct sk_buff *skb,
+				      struct rmnet_real_dev_info *rdinfo);
+
+#endif /* _RMNET_MAP_H_ */