ctcm: infrastructure for replaced ctc driver

ctcm driver supports the channel-to-channel connections of the
old ctc driver plus an additional MPC protocol to provide SNA
connectivity.

This new ctcm driver replaces the existing ctc driver.

Signed-off-by: Peter Tiedemann <ptiedem@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 239 insertions, 0 deletions

diff --git a/drivers/s390/net/ctcm_mpc.h b/drivers/s390/net/ctcm_mpc.h
new file mode 100644
index 00000000000..f99686069a9
--- /dev/null
+++ b/drivers/s390/net/ctcm_mpc.h
@@ -0,0 +1,239 @@
+/*
+ * drivers/s390/net/ctcm_mpc.h
+ *
+ * Copyright IBM Corp. 2007
+ * Authors:	Peter Tiedemann (ptiedem@de.ibm.com)
+ *
+ * 	MPC additions:
+ *		Belinda Thompson (belindat@us.ibm.com)
+ *		Andy Richter (richtera@us.ibm.com)
+ */
+
+#ifndef _CTC_MPC_H_
+#define _CTC_MPC_H_
+
+#include <linux/skbuff.h>
+#include "fsm.h"
+
+/*
+ * MPC external interface
+ * Note that ctc_mpc_xyz are called with a lock on ................
+ */
+
+/*  port_number is the mpc device 0, 1, 2 etc mpc2 is port_number 2 */
+
+/*  passive open  Just wait for XID2 exchange */
+extern int ctc_mpc_alloc_channel(int port,
+		void (*callback)(int port_num, int max_write_size));
+/* active open  Alloc then send XID2 */
+extern void ctc_mpc_establish_connectivity(int port,
+		void (*callback)(int port_num, int rc, int max_write_size));
+
+extern void ctc_mpc_dealloc_ch(int port);
+extern void ctc_mpc_flow_control(int port, int flowc);
+
+/*
+ * other MPC Group prototypes and structures
+ */
+
+#define ETH_P_SNA_DIX	0x80D5
+
+/*
+ * Declaration of an XID2
+ *
+ */
+#define ALLZEROS 0x0000000000000000
+
+#define XID_FM2		0x20
+#define XID2_0		0x00
+#define XID2_7		0x07
+#define XID2_WRITE_SIDE 0x04
+#define XID2_READ_SIDE	0x05
+
+struct xid2 {
+	__u8	xid2_type_id;
+	__u8	xid2_len;
+	__u32	xid2_adj_id;
+	__u8	xid2_rlen;
+	__u8	xid2_resv1;
+	__u8	xid2_flag1;
+	__u8	xid2_fmtt;
+	__u8	xid2_flag4;
+	__u16	xid2_resv2;
+	__u8	xid2_tgnum;
+	__u32	xid2_sender_id;
+	__u8	xid2_flag2;
+	__u8	xid2_option;
+	char  xid2_resv3[8];
+	__u16	xid2_resv4;
+	__u8	xid2_dlc_type;
+	__u16	xid2_resv5;
+	__u8	xid2_mpc_flag;
+	__u8	xid2_resv6;
+	__u16	xid2_buf_len;
+	char xid2_buffer[255 - (13 * sizeof(__u8) +
+				2 * sizeof(__u32) +
+				4 * sizeof(__u16) +
+				8 * sizeof(char))];
+} __attribute__ ((packed));
+
+#define XID2_LENGTH  (sizeof(struct xid2))
+
+struct th_header {
+	__u8	th_seg;
+	__u8	th_ch_flag;
+#define TH_HAS_PDU	0xf0
+#define TH_IS_XID	0x01
+#define TH_SWEEP_REQ	0xfe
+#define TH_SWEEP_RESP	0xff
+	__u8	th_blk_flag;
+#define TH_DATA_IS_XID	0x80
+#define TH_RETRY	0x40
+#define TH_DISCONTACT	0xc0
+#define TH_SEG_BLK	0x20
+#define TH_LAST_SEG	0x10
+#define TH_PDU_PART	0x08
+	__u8	th_is_xid;	/* is 0x01 if this is XID  */
+	__u32	th_seq_num;
+} __attribute__ ((packed));
+
+struct th_addon {
+	__u32	th_last_seq;
+	__u32	th_resvd;
+} __attribute__ ((packed));
+
+struct th_sweep {
+	struct th_header th;
+	struct th_addon sw;
+} __attribute__ ((packed));
+
+#define TH_HEADER_LENGTH (sizeof(struct th_header))
+#define TH_SWEEP_LENGTH (sizeof(struct th_sweep))
+
+#define PDU_LAST	0x80
+#define PDU_CNTL	0x40
+#define PDU_FIRST	0x20
+
+struct pdu {
+	__u32	pdu_offset;
+	__u8	pdu_flag;
+	__u8	pdu_proto;   /*  0x01 is APPN SNA  */
+	__u16	pdu_seq;
+} __attribute__ ((packed));
+
+#define PDU_HEADER_LENGTH  (sizeof(struct pdu))
+
+struct qllc {
+	__u8	qllc_address;
+#define QLLC_REQ	0xFF
+#define QLLC_RESP	0x00
+	__u8	qllc_commands;
+#define QLLC_DISCONNECT 0x53
+#define QLLC_UNSEQACK	0x73
+#define QLLC_SETMODE	0x93
+#define QLLC_EXCHID	0xBF
+} __attribute__ ((packed));
+
+
+/*
+ * Definition of one MPC group
+ */
+
+#define MAX_MPCGCHAN		10
+#define MPC_XID_TIMEOUT_VALUE	10000
+#define MPC_CHANNEL_ADD		0
+#define MPC_CHANNEL_REMOVE	1
+#define MPC_CHANNEL_ATTN	2
+#define XSIDE	1
+#define YSIDE	0
+
+struct mpcg_info {
+	struct sk_buff	*skb;
+	struct channel	*ch;
+	struct xid2	*xid;
+	struct th_sweep	*sweep;
+	struct th_header *th;
+};
+
+struct mpc_group {
+	struct tasklet_struct mpc_tasklet;
+	struct tasklet_struct mpc_tasklet2;
+	int	changed_side;
+	int	saved_state;
+	int	channels_terminating;
+	int	out_of_sequence;
+	int	flow_off_called;
+	int	port_num;
+	int	port_persist;
+	int	alloc_called;
+	__u32	xid2_adj_id;
+	__u8	xid2_tgnum;
+	__u32	xid2_sender_id;
+	int	num_channel_paths;
+	int	active_channels[2];
+	__u16	group_max_buflen;
+	int	outstanding_xid2;
+	int	outstanding_xid7;
+	int	outstanding_xid7_p2;
+	int	sweep_req_pend_num;
+	int	sweep_rsp_pend_num;
+	struct sk_buff	*xid_skb;
+	char		*xid_skb_data;
+	struct th_header *xid_th;
+	struct xid2	*xid;
+	char		*xid_id;
+	struct th_header *rcvd_xid_th;
+	struct sk_buff	*rcvd_xid_skb;
+	char		*rcvd_xid_data;
+	__u8		in_sweep;
+	__u8		roll;
+	struct xid2	*saved_xid2;
+	void 		(*allochanfunc)(int, int);
+	int		allocchan_callback_retries;
+	void 		(*estconnfunc)(int, int, int);
+	int		estconn_callback_retries;
+	int		estconn_called;
+	int		xidnogood;
+	int		send_qllc_disc;
+	fsm_timer	timer;
+	fsm_instance	*fsm; /* group xid fsm */
+};
+
+#ifdef DEBUGDATA
+void ctcmpc_dumpit(char *buf, int len);
+#else
+static inline void ctcmpc_dumpit(char *buf, int len)
+{
+}
+#endif
+
+#ifdef DEBUGDATA
+/*
+ * Dump header and first 16 bytes of an sk_buff for debugging purposes.
+ *
+ * skb	 The struct sk_buff to dump.
+ * offset Offset relative to skb-data, where to start the dump.
+ */
+void ctcmpc_dump_skb(struct sk_buff *skb, int offset);
+#else
+static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
+{}
+#endif
+
+static inline void ctcmpc_dump32(char *buf, int len)
+{
+	if (len < 32)
+		ctcmpc_dumpit(buf, len);
+	else
+		ctcmpc_dumpit(buf, 32);
+}
+
+int ctcmpc_open(struct net_device *);
+void ctcm_ccw_check_rc(struct channel *, int, char *);
+void mpc_group_ready(unsigned long adev);
+int mpc_channel_action(struct channel *ch, int direction, int action);
+void mpc_action_send_discontact(unsigned long thischan);
+void mpc_action_discontact(fsm_instance *fi, int event, void *arg);
+void ctcmpc_bh(unsigned long thischan);
+#endif
+/* --- This is the END my friend --- */