common/sys/softmac_impl.h

	softmac_impl.h revision 2c2d21e98a95cba5687ec6574c974a5c6c4a6adb
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_SOFTMAC_IMPL_H
#define _SYS_SOFTMAC_IMPL_H

#include <sys/types.h>
#include <sys/ethernet.h>
#include <sys/taskq.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>
#include <sys/strsun.h>
#include <sys/stream.h>
#include <sys/dlpi.h>
#include <sys/mac.h>
#include <sys/mac_provider.h>
#include <sys/mac_client.h>
#include <sys/mac_client_priv.h>
#include <sys/mac_ether.h>

#ifdef  __cplusplus
extern "C" {
#endif

typedef void    (*softmac_rx_t)(void *, mac_resource_handle_t, mblk_t *,
            mac_header_info_t *);

typedef struct softmac_lower_rxinfo_s {
    softmac_rx_t    slr_rx;
    void        *slr_arg;
} softmac_lower_rxinfo_t;

typedef struct softmac_lower_s {
    ldi_handle_t        sl_lh;
    struct softmac      *sl_softmac;
    queue_t         *sl_wq;
    struct softmac_upper_s  *sl_sup;
    softmac_lower_rxinfo_t  *sl_rxinfo;

    /*
     * When a control message is processed, either sl_pending_prim or
     * sl_pending_ioctl will be set.  They will be cleared when the
     * acknowledgement of the specific control message is received
     * from the underlying legacy driver.
     */
    kmutex_t        sl_mutex;
    kcondvar_t      sl_cv;
    t_uscalar_t     sl_pending_prim;
    boolean_t       sl_pending_ioctl;
    mblk_t          *sl_ack_mp;
} softmac_lower_t;

typedef enum {
    SOFTMAC_UNINIT,
    SOFTMAC_ATTACH_INPROG,
    SOFTMAC_ATTACH_DONE,
    SOFTMAC_DETACH_INPROG,
} softmac_state_t;

typedef struct softmac_dev_s {
    dev_t   sd_dev;
} softmac_dev_t;

/*
 * smac_flag values.
 */
#define SOFTMAC_GLDV3       0x01
#define SOFTMAC_NOSUPP      0x02
#define SOFTMAC_NEED_RECREATE   0x04
#define SOFTMAC_NOTIFY_QUIT 0x08

#define SMAC_NONZERO_NODECNT(softmac)       \
    ((softmac->smac_softmac[0] != NULL) +   \
    (softmac->smac_softmac[1] != NULL))

/*
 * The softmac structure allows all minor nodes (at most two, style-1 and
 * style-2) for the same device to be processed.  A softmac_dev_t will be
 * created for each minor node.
 *
 * We try to "register" the mac after all the softmac_dev_t's are processed so
 * that even if DLPI operations fail (because of driver bugs) for one minor
 * node, the other minor node can still be used to register the mac.
 * (Specifically, an incorrect xxx_getinfo() implementation will cause style-2
 * minor node mac registration to fail.)
 *
 * Locking description:
 *  WO: write once, valid the life time.
 */
typedef struct softmac {
    char        smac_devname[MAXNAMELEN];   /* WO */
    major_t     smac_umajor;            /* WO */
    int     smac_uppa;          /* WO */
    uint32_t    smac_cnt;   /* WO, # of minor nodes */

    kmutex_t    smac_mutex;
    kcondvar_t  smac_cv;
    softmac_state_t smac_state;     /* smac_mutex */
    /*
     * The smac_hold_cnt field increases when softmac_hold_device() is
     * called to force the dls_vlan_t of the device to be created.  The
     * device pre-detach fails if this counter is not 0.
     */
    uint32_t    smac_hold_cnt;      /* smac_mutex */
    uint32_t    smac_flags;     /* smac_mutex */
    int     smac_attacherr;     /* smac_mutex */
    mac_handle_t    smac_mh;
    softmac_dev_t   *smac_softmac[2];   /* smac_mutex */

    /*
     * Number of minor nodes whose post-attach routine has succeeded.
     * This should be the same as the numbers of softmac_dev_t.
     * Note that it does not imply SOFTMAC_ATTACH_DONE as the taskq might
     * be still ongoing.
     */
    uint32_t    smac_attachok_cnt;  /* smac_mutex */
    /*
     * Number of softmac_dev_t left when pre-detach fails. This is used
     * to indicate whether postattach is called because of a failed
     * pre-detach.
     */
    uint32_t    smac_attached_left; /* smac_mutex */

    /*
     * Thread handles the DL_NOTIFY_IND message from the lower stream.
     */
    kthread_t   *smac_notify_thread;    /* smac_mutex */
    /*
     * Head and tail of the DL_NOTIFY_IND messsages.
     */
    mblk_t      *smac_notify_head;  /* smac_mutex */
    mblk_t      *smac_notify_tail;  /* smac_mutex */

    /*
     * The remaining fields are used to register the MAC for a legacy
     * device.  They are set in softmac_mac_register() and do not change.
     * One can access them when mac_register() is done without locks.
     */

    /*
     * media type is needed for create <link name, linkid> mapping, so
     * it is set for GLDv3 device as well
     */
    uint_t      smac_media;
    /* DLPI style of the underlying device */
    int     smac_style;
    dev_t       smac_dev;
    size_t      smac_saplen;
    size_t      smac_addrlen;
    uchar_t     smac_unicst_addr[MAXMACADDRLEN];
    uint_t      smac_min_sdu;
    uint_t      smac_max_sdu;
    uint32_t    smac_margin;

    /* Notifications the underlying driver can support. */
    uint32_t    smac_notifications;

    /*
     * Capabilities of the underlying driver.
     */
    uint32_t    smac_capab_flags;
    uint32_t    smac_hcksum_txflags;
    boolean_t   smac_no_capability_req;
    dl_capab_mdt_t  smac_mdt_capab;
    boolean_t   smac_mdt;

    /*
     * Lower stream structure, accessed by the MAC provider API. The GLDv3
     * framework assures it's validity.
     */
    softmac_lower_t *smac_lower;

    kmutex_t    smac_active_mutex;
    /*
     * Set by xxx_active_set() when aggregation is created.
     */
    boolean_t   smac_active;    /* smac_active_mutex */
    /*
     * Numbers of the bounded streams in the fast-path mode.
     */
    uint32_t    smac_nactive;   /* smac_active_mutex */

    kmutex_t    smac_fp_mutex;
    kcondvar_t  smac_fp_cv;
    /*
     * numbers of clients that request to disable fastpath.
     */
    uint32_t    smac_fp_disable_clients;    /* smac_fp_mutex */
    boolean_t   smac_fastpath_admin_disabled;   /* smac_fp_mutex */

    /*
     * stream list over this softmac.
     */
    list_t          smac_sup_list;      /* smac_fp_mutex */
} softmac_t;

typedef struct smac_ioc_start_s {
    softmac_lower_t *si_slp;
} smac_ioc_start_t;

#define SMAC_IOC    ('S' << 24 | 'M' << 16 | 'C' << 8)
#define SMAC_IOC_START  (SMAC_IOC | 0x01)

/*
 * The su_mode of a non-IP/ARP stream is UNKNOWN, and the su_mode of an IP/ARP
 * stream is either SLOWPATH or FASTPATH.
 */
#define SOFTMAC_UNKNOWN     0x00
#define SOFTMAC_SLOWPATH    0x01
#define SOFTMAC_FASTPATH    0x02

typedef struct softmac_switch_req_s {
    list_node_t ssq_req_list_node;
    uint32_t    ssq_expected_mode;
} softmac_switch_req_t;

#define DATAPATH_MODE(softmac)                      \
    ((((softmac)->smac_fp_disable_clients != 0) ||          \
    (softmac)->smac_fastpath_admin_disabled) ? SOFTMAC_SLOWPATH :   \
    SOFTMAC_FASTPATH)


/*
 * Locking description:
 *
 *  WO: Set once and valid for life;
 *  SL: Serialized by the control path (softmac_wput_nondata_task())
 */
typedef struct softmac_upper_s {
    softmac_t       *su_softmac;    /* WO */
    queue_t         *su_rq;     /* WO */
    queue_t         *su_wq;     /* WO */

    /*
     * List of upper streams that has pending DLPI messages to be processed.
     */
    list_node_t     su_taskq_list_node; /* softmac_taskq_lock */

    /*
     * non-NULL for IP/ARP streams in the fast-path mode
     */
    softmac_lower_t     *su_slp;    /* SL & su_mutex */

    /*
     * List of all IP/ARP upperstreams on the same softmac (including
     * the ones in both data-path modes).
     */
    list_node_t     su_list_node;   /* smac_fp_mutex */

    /*
     * List of datapath switch requests.
     */
    list_t          su_req_list;    /* smac_fp_mutex */

    /*
     * Place holder of RX callbacks used to handles data messages comes
     * from the dedicated-lower-stream associated with the IP/ARP stream.
     * Another RX callback is softmac_drop_rxinfo, which is a global
     * variable.
     */
    softmac_lower_rxinfo_t  su_rxinfo;      /* WO */
    softmac_lower_rxinfo_t  su_direct_rxinfo;   /* WO */

    /*
     * Used to serialize the DLPI operation and fastpath<->slowpath
     * switching over operation.
     */
    kmutex_t        su_disp_mutex;
    kcondvar_t      su_disp_cv;
    mblk_t          *su_pending_head;   /* su_disp_mutex */
    mblk_t          *su_pending_tail;   /* su_disp_mutex */
    boolean_t       su_dlpi_pending;    /* su_disp_mutex */
    boolean_t       su_closing;     /* su_disp_mutex */

    uint32_t        su_bound : 1,       /* SL */
                su_active : 1,      /* SL */
                su_direct : 1,      /* SL */
                su_is_arp : 1,
                su_pad_to_32:28;

    /*
     * Used for fastpath data path.
     */
    kmutex_t        su_mutex;
    kcondvar_t      su_cv;
    mblk_t          *su_tx_flow_mp;     /* su_mutex */
    boolean_t       su_tx_busy;     /* su_mutex */
    /*
     * Number of softmac_srv() operation in fastpath processing.
     */
    uint32_t        su_tx_inprocess;    /* su_mutex */
    /*
     * SOFTMAC_SLOWPATH or SOFTMAC_FASTPATH
     */
    uint32_t        su_mode;        /* SL & su_mutex */

    /*
     * Whether this stream is already scheduled in softmac_taskq_list.
     */
    boolean_t       su_taskq_scheduled; /* softmac_taskq_lock */

    /*
     * The DLD_CAPAB_DIRECT related notify callback.
     */
    mac_tx_notify_t     su_tx_notify_func;  /* su_mutex */
    void            *su_tx_notify_arg;  /* su_mutex */
} softmac_upper_t;

#define SOFTMAC_EQ_PENDING(sup, mp) {                   \
    if ((sup)->su_pending_head == NULL) {               \
        (sup)->su_pending_head = (sup)->su_pending_tail = (mp); \
    } else {                            \
        (sup)->su_pending_tail->b_next = (mp);          \
        (sup)->su_pending_tail = (mp);              \
    }                               \
}

#define SOFTMAC_DQ_PENDING(sup, mpp) {                  \
    if ((sup)->su_pending_head == NULL) {               \
        *(mpp) = NULL;                      \
    } else {                            \
        *(mpp) = (sup)->su_pending_head;            \
        if (((sup)->su_pending_head = (*(mpp))->b_next) == NULL)\
            (sup)->su_pending_tail = NULL;          \
        (*(mpp))->b_next = NULL;                \
    }                               \
}

/*
 * A macro to check whether the write-queue of the lower stream is full
 * and packets need to be enqueued.
 *
 * Because softmac is pushed right above the underlying device and
 * _I_INSERT/_I_REMOVE is not processed in the lower stream, it is
 * safe to directly access the q_next pointer.
 */
#define SOFTMAC_CANPUTNEXT(q)   \
    (!((q)->q_next->q_nfsrv->q_flag & QFULL) || canput((q)->q_next))


extern dev_info_t       *softmac_dip;
#define SOFTMAC_DEV_NAME    "softmac"

extern int  softmac_send_bind_req(softmac_lower_t *, uint_t);
extern int  softmac_send_unbind_req(softmac_lower_t *);
extern int  softmac_send_notify_req(softmac_lower_t *, uint32_t);
extern int  softmac_send_promisc_req(softmac_lower_t *, t_uscalar_t,
    boolean_t);
extern void softmac_init();
extern void softmac_fini();
extern void softmac_fp_init();
extern void softmac_fp_fini();
extern boolean_t softmac_busy();
extern int  softmac_fill_capab(ldi_handle_t, softmac_t *);
extern int  softmac_capab_enable(softmac_lower_t *);
extern void softmac_rput_process_notdata(queue_t *, softmac_upper_t *,
    mblk_t *);
extern void softmac_rput_process_data(softmac_lower_t *, mblk_t *);
extern int  softmac_output(softmac_lower_t *, mblk_t *, t_uscalar_t,
    t_uscalar_t, mblk_t **);
extern int  softmac_mexchange_error_ack(mblk_t **, t_uscalar_t,
    t_uscalar_t, t_uscalar_t);

extern int  softmac_m_promisc(void *, boolean_t);
extern int  softmac_m_multicst(void *, boolean_t, const uint8_t *);
extern int  softmac_m_unicst(void *, const uint8_t *);
extern void softmac_m_ioctl(void *, queue_t *, mblk_t *);
extern int  softmac_m_stat(void *, uint_t, uint64_t *);
extern mblk_t   *softmac_m_tx(void *, mblk_t *);
extern int  softmac_proto_tx(softmac_lower_t *, mblk_t *, mblk_t **);
extern void softmac_ioctl_tx(softmac_lower_t *, mblk_t *, mblk_t **);
extern void softmac_notify_thread(void *);

extern int  softmac_hold(dev_t, softmac_t **);
extern void softmac_rele(softmac_t *);
extern int  softmac_lower_setup(softmac_t *, softmac_upper_t *,
    softmac_lower_t **);
extern boolean_t    softmac_active_set(void *);
extern void softmac_active_clear(void *);
extern int  softmac_fastpath_disable(void *);
extern void softmac_fastpath_enable(void *);
extern int  softmac_datapath_switch(softmac_t *, boolean_t, boolean_t);

extern void softmac_wput_data(softmac_upper_t *, mblk_t *);
extern void softmac_wput_nondata(softmac_upper_t *, mblk_t *);
extern void softmac_upperstream_close(softmac_upper_t *);

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_SOFTMAC_IMPL_H */