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, 287 insertions, 0 deletions

diff --git a/drivers/s390/net/ctcm_main.h b/drivers/s390/net/ctcm_main.h
new file mode 100644
index 000000000000..95b0c0b6ebc6
--- /dev/null
+++ b/drivers/s390/net/ctcm_main.h
@@ -0,0 +1,287 @@
+/*
+ *      drivers/s390/net/ctcm_main.h
+ *
+ *      Copyright IBM Corp. 2001, 2007
+ *      Authors:        Fritz Elfert (felfert@millenux.com)
+ *                      Peter Tiedemann (ptiedem@de.ibm.com)
+ */
+
+#ifndef _CTCM_MAIN_H_
+#define _CTCM_MAIN_H_
+
+#include <asm/ccwdev.h>
+#include <asm/ccwgroup.h>
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+
+#include "fsm.h"
+#include "cu3088.h"
+#include "ctcm_dbug.h"
+#include "ctcm_mpc.h"
+
+#define CTC_DRIVER_NAME "ctcm"
+#define CTC_DEVICE_NAME "ctc"
+#define CTC_DEVICE_GENE "ctc%d"
+#define MPC_DEVICE_NAME "mpc"
+#define MPC_DEVICE_GENE "mpc%d"
+
+#define CHANNEL_FLAGS_READ      0
+#define CHANNEL_FLAGS_WRITE     1
+#define CHANNEL_FLAGS_INUSE     2
+#define CHANNEL_FLAGS_BUFSIZE_CHANGED   4
+#define CHANNEL_FLAGS_FAILED    8
+#define CHANNEL_FLAGS_WAITIRQ   16
+#define CHANNEL_FLAGS_RWMASK    1
+#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
+
+#define LOG_FLAG_ILLEGALPKT     1
+#define LOG_FLAG_ILLEGALSIZE    2
+#define LOG_FLAG_OVERRUN        4
+#define LOG_FLAG_NOMEM          8
+
+#define ctcm_pr_debug(fmt, arg...) printk(KERN_DEBUG fmt, ##arg)
+#define ctcm_pr_info(fmt, arg...) printk(KERN_INFO fmt, ##arg)
+#define ctcm_pr_notice(fmt, arg...) printk(KERN_NOTICE fmt, ##arg)
+#define ctcm_pr_warn(fmt, arg...) printk(KERN_WARNING fmt, ##arg)
+#define ctcm_pr_emerg(fmt, arg...) printk(KERN_EMERG fmt, ##arg)
+#define ctcm_pr_err(fmt, arg...) printk(KERN_ERR fmt, ##arg)
+#define ctcm_pr_crit(fmt, arg...) printk(KERN_CRIT fmt, ##arg)
+
+/*
+ * CCW commands, used in this driver.
+ */
+#define CCW_CMD_WRITE           0x01
+#define CCW_CMD_READ            0x02
+#define CCW_CMD_NOOP            0x03
+#define CCW_CMD_TIC             0x08
+#define CCW_CMD_SENSE_CMD       0x14
+#define CCW_CMD_WRITE_CTL       0x17
+#define CCW_CMD_SET_EXTENDED    0xc3
+#define CCW_CMD_PREPARE         0xe3
+
+#define CTCM_PROTO_S390         0
+#define CTCM_PROTO_LINUX        1
+#define CTCM_PROTO_LINUX_TTY    2
+#define CTCM_PROTO_OS390        3
+#define CTCM_PROTO_MPC          4
+#define CTCM_PROTO_MAX          4
+
+#define CTCM_BUFSIZE_LIMIT      65535
+#define CTCM_BUFSIZE_DEFAULT    32768
+#define MPC_BUFSIZE_DEFAULT     CTCM_BUFSIZE_LIMIT
+
+#define CTCM_TIME_1_SEC         1000
+#define CTCM_TIME_5_SEC         5000
+#define CTCM_TIME_10_SEC        10000
+
+#define CTCM_INITIAL_BLOCKLEN   2
+
+#define READ                    0
+#define WRITE                   1
+
+#define CTCM_ID_SIZE            BUS_ID_SIZE+3
+
+struct ctcm_profile {
+        unsigned long maxmulti;
+        unsigned long maxcqueue;
+        unsigned long doios_single;
+        unsigned long doios_multi;
+        unsigned long txlen;
+        unsigned long tx_time;
+        struct timespec send_stamp;
+};
+
+/*
+ * Definition of one channel
+ */
+struct channel {
+        struct channel *next;
+        char id[CTCM_ID_SIZE];
+        struct ccw_device *cdev;
+        /*
+         * Type of this channel.
+         * CTC/A or Escon for valid channels.
+         */
+        enum channel_types type;
+        /*
+         * Misc. flags. See CHANNEL_FLAGS_... below
+         */
+        __u32 flags;
+        __u16 protocol;         /* protocol of this channel (4 = MPC) */
+        /*
+         * I/O and irq related stuff
+         */
+        struct ccw1 *ccw;
+        struct irb *irb;
+        /*
+         * RX/TX buffer size
+         */
+        int max_bufsize;
+        struct sk_buff *trans_skb;      /* transmit/receive buffer */
+        struct sk_buff_head io_queue;   /* universal I/O queue */
+        struct tasklet_struct ch_tasklet;       /* MPC ONLY */
+        /*
+         * TX queue for collecting skb's during busy.
+         */
+        struct sk_buff_head collect_queue;
+        /*
+         * Amount of data in collect_queue.
+         */
+        int collect_len;
+        /*
+         * spinlock for collect_queue and collect_len
+         */
+        spinlock_t collect_lock;
+        /*
+         * Timer for detecting unresposive
+         * I/O operations.
+         */
+        fsm_timer timer;
+        /* MPC ONLY section begin */
+        __u32   th_seq_num;     /* SNA TH seq number */
+        __u8    th_seg;
+        __u32   pdu_seq;
+        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 xid2             *rcvd_xid;
+        char                    *rcvd_xid_id;
+        __u8                    in_mpcgroup;
+        fsm_timer               sweep_timer;
+        struct sk_buff_head     sweep_queue;
+        struct th_header        *discontact_th;
+        struct tasklet_struct   ch_disc_tasklet;
+        /* MPC ONLY section end */
+
+        int retry;              /* retry counter for misc. operations */
+        fsm_instance *fsm;      /* finite state machine of this channel */
+        struct net_device *netdev;      /* corresponding net_device */
+        struct ctcm_profile prof;
+        unsigned char *trans_skb_data;
+        __u16 logflags;
+};
+
+struct ctcm_priv {
+        struct net_device_stats stats;
+        unsigned long   tbusy;
+
+        /* The MPC group struct of this interface */
+        struct  mpc_group       *mpcg;  /* MPC only */
+        struct  xid2            *xid;   /* MPC only */
+
+        /* The finite state machine of this interface */
+        fsm_instance *fsm;
+
+        /* The protocol of this device */
+        __u16 protocol;
+
+        /* Timer for restarting after I/O Errors */
+        fsm_timer       restart_timer;
+
+        int buffer_size;        /* ctc only */
+
+        struct channel *channel[2];
+};
+
+int ctcm_open(struct net_device *dev);
+int ctcm_close(struct net_device *dev);
+
+/*
+ * prototypes for non-static sysfs functions
+ */
+int ctcm_add_attributes(struct device *dev);
+void ctcm_remove_attributes(struct device *dev);
+int ctcm_add_files(struct device *dev);
+void ctcm_remove_files(struct device *dev);
+
+/*
+ * Compatibility macros for busy handling
+ * of network devices.
+ */
+static inline void ctcm_clear_busy_do(struct net_device *dev)
+{
+        clear_bit(0, &(((struct ctcm_priv *)dev->priv)->tbusy));
+        netif_wake_queue(dev);
+}
+
+static inline void ctcm_clear_busy(struct net_device *dev)
+{
+        struct mpc_group *grp;
+        grp = ((struct ctcm_priv *)dev->priv)->mpcg;
+
+        if (!(grp && grp->in_sweep))
+                ctcm_clear_busy_do(dev);
+}
+
+
+static inline int ctcm_test_and_set_busy(struct net_device *dev)
+{
+        netif_stop_queue(dev);
+        return test_and_set_bit(0, &(((struct ctcm_priv *)dev->priv)->tbusy));
+}
+
+extern int loglevel;
+extern struct channel *channels;
+
+void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb);
+
+/*
+ * Functions related to setup and device detection.
+ */
+
+static inline int ctcm_less_than(char *id1, char *id2)
+{
+        unsigned long dev1, dev2;
+
+        id1 = id1 + 5;
+        id2 = id2 + 5;
+
+        dev1 = simple_strtoul(id1, &id1, 16);
+        dev2 = simple_strtoul(id2, &id2, 16);
+
+        return (dev1 < dev2);
+}
+
+int ctcm_ch_alloc_buffer(struct channel *ch);
+
+static inline int ctcm_checkalloc_buffer(struct channel *ch)
+{
+        if (ch->trans_skb == NULL)
+                return ctcm_ch_alloc_buffer(ch);
+        if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) {
+                dev_kfree_skb(ch->trans_skb);
+                return ctcm_ch_alloc_buffer(ch);
+        }
+        return 0;
+}
+
+struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
+
+/* test if protocol attribute (of struct ctcm_priv or struct channel)
+ * has MPC protocol setting. Type is not checked
+ */
+#define IS_MPC(p) ((p)->protocol == CTCM_PROTO_MPC)
+
+/* test if struct ctcm_priv of struct net_device has MPC protocol setting */
+#define IS_MPCDEV(d) IS_MPC((struct ctcm_priv *)d->priv)
+
+static inline gfp_t gfp_type(void)
+{
+        return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
+}
+
+/*
+ * Definition of our link level header.
+ */
+struct ll_header {
+        __u16 length;
+        __u16 type;
+        __u16 unused;
+};
+#define LL_HEADER_LENGTH (sizeof(struct ll_header))
+
+#endif