/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * This file contains code imported from the OFED rds source file af_rds.c
 * Oracle elects to have and use the contents of af_rds.c under and governed
 * by the OpenIB.org BSD license (see below for full license text). However,
 * the following notice accompanied the original version of this file:
 */

/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/modctl.h>
#include <sys/rds.h>
#include <sys/stropts.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysmacros.h>

#include <inet/ip.h>
#include <net/if_types.h>

#include <sys/ib/clients/rdsv3/rdsv3.h>
#include <sys/ib/clients/rdsv3/rdma.h>
#include <sys/ib/clients/rdsv3/rdma_transport.h>
#include <sys/ib/clients/rdsv3/rdsv3_debug.h>

extern void rdsv3_remove_bound(struct rdsv3_sock *rds);
extern int rdsv3_verify_bind_address(ipaddr_t addr);

extern ddi_taskq_t      *rdsv3_taskq;
extern struct rdma_cm_id *rdsv3_rdma_listen_id;

/* this is just used for stats gathering :/ */
kmutex_t rdsv3_sock_lock;
static unsigned long rdsv3_sock_count;
list_t rdsv3_sock_list;

/*
 * This is called as the final descriptor referencing this socket is closed.
 * We have to unbind the socket so that another socket can be bound to the
 * address it was using.
 *
 * We have to be careful about racing with the incoming path.  sock_orphan()
 * sets SOCK_DEAD and we use that as an indicator to the rx path that new
 * messages shouldn't be queued.
 */
/* ARGSUSED */
static int
rdsv3_release(sock_lower_handle_t proto_handle, int flgs, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs;

        if (!sk)
                goto out;

        rs = rdsv3_sk_to_rs(sk);
        RDSV3_DPRINTF4("rdsv3_release", "Enter(rs: %p, sk: %p)", rs, sk);

        rdsv3_sk_sock_orphan(sk);
        rdsv3_cong_remove_socket(rs);
        rdsv3_remove_bound(rs);

        /*
         * Note - rdsv3_clear_recv_queue grabs rs_recv_lock, so
         * that ensures the recv path has completed messing
         * with the socket.
         *
         * Note2 - rdsv3_clear_recv_queue(rs) should be called first
         * to prevent some race conditions, which is different from
         * the Linux code.
         */
        rdsv3_clear_recv_queue(rs);
        rdsv3_send_drop_to(rs, NULL);
        rdsv3_rdma_drop_keys(rs);
        (void) rdsv3_notify_queue_get(rs, NULL);

        mutex_enter(&rdsv3_sock_lock);
        list_remove_node(&rs->rs_item);
        rdsv3_sock_count--;
        mutex_exit(&rdsv3_sock_lock);

        while (sk->sk_refcount > 1) {
                /* wait for 1 sec and try again */
                delay(drv_usectohz(1000000));
        }

        /* this will free the rs and sk */
        rdsv3_sk_sock_put(sk);

        RDSV3_DPRINTF4("rdsv3_release", "Return (rds: %p)", rs);
out:
        return (0);
}

void
__rdsv3_wake_sk_sleep(struct rsock *sk)
{
        /* wakup anyone waiting in recvmsg */
        if (!rdsv3_sk_sock_flag(sk, SOCK_DEAD) && sk->sk_sleep)
                rdsv3_wake_up(sk->sk_sleep);
}

/*
 * Careful not to race with rdsv3_release -> sock_orphan which clears sk_sleep.
 * _bh() isn't OK here, we're called from interrupt handlers.  It's probably OK
 * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
 * this seems more conservative.
 * NB - normally, one would use sk_callback_lock for this, but we can
 * get here from interrupts, whereas the network code grabs sk_callback_lock
 * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
 */
void
rdsv3_wake_sk_sleep(struct rdsv3_sock *rs)
{
        RDSV3_DPRINTF4("rdsv3_wake_sk_sleep", "Enter(rs: %p)", rs);

        rw_enter(&rs->rs_recv_lock, RW_READER);
        __rdsv3_wake_sk_sleep(rdsv3_rs_to_sk(rs));
        rw_exit(&rs->rs_recv_lock);
}

/*ARGSUSED*/
static int
rdsv3_getname(sock_lower_handle_t proto_handle, struct sockaddr *addr,
    socklen_t *addr_len, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct sockaddr_in *sin = (struct sockaddr_in *)addr;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);

        RDSV3_DPRINTF4("rdsv3_getname", "Enter(rs: %p, port: %d)", rs,
            rs->rs_bound_port);

        sin->sin_port = rs->rs_bound_port;
        sin->sin_addr.s_addr = rs->rs_bound_addr;

        sin->sin_family = AF_INET_OFFLOAD;

        *addr_len = sizeof (*sin);
        return (0);
}

/*
 * RDS' poll is without a doubt the least intuitive part of the interface,
 * as POLLIN and POLLOUT do not behave entirely as you would expect from
 * a network protocol.
 *
 * POLLIN is asserted if
 *  -   there is data on the receive queue.
 *  -   to signal that a previously congested destination may have become
 *      uncongested
 *  -   A notification has been queued to the socket (this can be a congestion
 *      update, or a RDMA completion).
 *
 * POLLOUT is asserted if there is room on the send queue. This does not mean
 * however, that the next sendmsg() call will succeed. If the application tries
 * to send to a congested destination, the system call may still fail (and
 * return ENOBUFS).
 */
/* ARGSUSED */
static short
rdsv3_poll(sock_lower_handle_t proto_handle, short events, int anyyet,
    cred_t *cr)
{
        struct rsock    *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock       *rs = rdsv3_sk_to_rs(sk);
        unsigned short mask = 0;

#if 0
        RDSV3_DPRINTF4("rdsv3_poll", "enter(%p %x %d)", rs, events, anyyet);
#endif

        /*
         * If rs_seen_congestion is on, wait until it's off.
         * This is implemented for the following OFED code.
         *      if (rs->rs_seen_congestion)
         *              poll_wait(file, &rds_poll_waitq, wait);
         */
        mutex_enter(&rs->rs_congested_lock);
        while (rs->rs_seen_congestion) {
                cv_wait(&rs->rs_congested_cv,
                    &rs->rs_congested_lock);
        }
        mutex_exit(&rs->rs_congested_lock);

        rw_enter(&rs->rs_recv_lock, RW_READER);
        if (!rs->rs_cong_monitor) {
                /*
                 * When a congestion map was updated, we signal POLLIN for
                 * "historical" reasons. Applications can also poll for
                 * WRBAND instead.
                 */
                if (rdsv3_cong_updated_since(&rs->rs_cong_track))
                        mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
        } else {
                mutex_enter(&rs->rs_lock);
                if (rs->rs_cong_notify)
                        mask |= (POLLIN | POLLRDNORM);
                mutex_exit(&rs->rs_lock);
        }
        if (!list_is_empty(&rs->rs_recv_queue) ||
            !list_is_empty(&rs->rs_notify_queue))
                mask |= (POLLIN | POLLRDNORM);
        if (rs->rs_snd_bytes < rdsv3_sk_sndbuf(rs))
                mask |= (POLLOUT | POLLWRNORM);

        /* clear state any time we wake a seen-congested socket */
        if (mask) {
                mutex_enter(&rs->rs_congested_lock);
                rs->rs_seen_congestion = 0;
                mutex_exit(&rs->rs_congested_lock);
        }

        rw_exit(&rs->rs_recv_lock);

#if 0
        RDSV3_DPRINTF4("rdsv3_poll", "return(%p %x)", rs, mask);
#endif

        return (mask);
}

/* ARGSUSED */
static int
rdsv3_ioctl(sock_lower_handle_t proto_handle, int cmd, intptr_t arg,
    int mode, int32_t *rvalp, cred_t *cr)
{
        ksocket_t       so4;
        struct lifconf  lifc;
        struct lifreq   lifr, *lifrp;
        struct ifconf   ifc;
        struct ifreq    ifr;
        int             rval = 0, rc, len;
        int             numifs;
        int             bufsize;
        void            *buf;

        RDSV3_DPRINTF4("rdsv3_ioctl", "enter: cmd: %d", cmd);

        /* Only ipv4 for now */
        rval = ksocket_socket(&so4, PF_INET, SOCK_DGRAM, 0, KSOCKET_NOSLEEP,
            CRED());
        if (rval != 0) {
                RDSV3_DPRINTF2("rdsv3_ioctl", "ksocket_socket returned %d",
                    rval);
                return (rval);
        }

        switch (cmd) {
        case SIOCGLIFNUM :
        case SIOCGIFNUM :
                rval = rdsv3_do_ip_ioctl(so4, &buf, &bufsize, &numifs);
                if (rval != 0) break;
                if (cmd == SIOCGLIFNUM) {
                        struct lifnum   lifn;
                        lifn.lifn_family = AF_INET_OFFLOAD;
                        lifn.lifn_flags = 0;
                        lifn.lifn_count = numifs;
                        (void) ddi_copyout(&lifn, (void *)arg,
                            sizeof (struct lifnum), 0);
                } else {
                        len = 0;
                        for (lifrp = (struct lifreq *)buf, rc = 0; rc < numifs;
                            rc++, lifrp++) {
                                if (strlen(lifrp->lifr_name) <= IFNAMSIZ) {
                                        len++;
                                }
                        }
                        (void) ddi_copyout(&len, (void *)arg,
                            sizeof (int), 0);
                }
                kmem_free(buf, bufsize);
                break;

        case SIOCGLIFCONF :
                if (ddi_copyin((void *)arg, &lifc, sizeof (struct lifconf), 0)
                    != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl", "ddi_copyin failed lifc");
                        rval = EFAULT;
                        break;
                }

                rval = rdsv3_do_ip_ioctl(so4, &buf, &bufsize, &numifs);
                if (rval != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "rdsv3_do_ip_ioctl failed: %d", rval);
                        break;
                }

                if ((lifc.lifc_len > 0) && (numifs > 0)) {
                        if (ddi_copyout(buf, (void *)lifc.lifc_req,
                            (lifc.lifc_len < bufsize) ? lifc.lifc_len :
                            bufsize, 0) != 0) {
                                RDSV3_DPRINTF2("rdsv3_ioctl",
                                    "copyout of records failed");
                                rval = EFAULT;
                        }

                }

                lifc.lifc_len = bufsize;
                if (ddi_copyout(&lifc, (void *)arg, sizeof (struct lifconf),
                    0) != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "copyout of lifconf failed");
                        rval = EFAULT;
                }

                kmem_free(buf, bufsize);
                break;

        case SIOCGIFCONF :
        case O_SIOCGIFCONF :
                if (ddi_copyin((void *)arg, &ifc, sizeof (struct ifconf), 0)
                    != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl", "ddi_copyin failed ifc");
                        rval = EFAULT;
                        break;
                }

                RDSV3_DPRINTF2("rdsv3_ioctl",
                    "O_SIOCGIFCONF: ifc_len: %d, req: %p",
                    ifc.ifc_len, ifc.ifc_req);

                rval = rdsv3_do_ip_ioctl_old(so4, &buf, &bufsize, &numifs);
                if (rval != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "rdsv3_do_ip_ioctl_old failed: %d", rval);
                        break;
                }

                if ((ifc.ifc_len > 0) && (numifs > 0)) {
                        if (ddi_copyout(buf, (void *)ifc.ifc_req,
                            (ifc.ifc_len < bufsize) ? ifc.ifc_len :
                            bufsize, 0) != 0) {
                                RDSV3_DPRINTF2("rdsv3_ioctl",
                                    "copyout of records failed");
                                rval = EFAULT;
                        }

                }

                ifc.ifc_len = bufsize;
                if (ddi_copyout(&ifc, (void *)arg, sizeof (struct ifconf),
                    0) != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "copyout of ifconf failed");
                        rval = EFAULT;
                }

                kmem_free(buf, bufsize);
                break;

        case SIOCGLIFFLAGS :
        case SIOCSLIFFLAGS :
        case SIOCGLIFMTU :
        case SIOCGLIFNETMASK :
        case SIOCGLIFINDEX :
                if (ddi_copyin((void *)arg, &lifr, sizeof (struct lifreq), 0)
                    != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl", "ddi_copyin failed lifr");
                        rval = EFAULT;
                        break;
                }

                rc = ksocket_ioctl(so4, cmd, (intptr_t)&lifr, &rval, CRED());
                if (rc != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "ksocket_ioctl failed: %d, name: %s cmd: 0x%x",
                            rc, lifr.lifr_name, cmd);
                        break;
                }

                (void) ddi_copyout(&lifr, (void *)arg,
                    sizeof (struct lifreq), 0);
                break;

        case SIOCGIFFLAGS :
        case SIOCSIFFLAGS :
        case SIOCGIFMTU :
        case SIOCGIFNETMASK :
        case SIOCGIFINDEX :
                if (ddi_copyin((void *)arg, &ifr, sizeof (struct ifreq), 0)
                    != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl", "ddi_copyin failed ifr");
                        rval = EFAULT;
                        break;
                }

                RDSV3_DPRINTF2("rdsv3_ioctl", "1. name: %s", ifr.ifr_name);

                rc = ksocket_ioctl(so4, cmd, (intptr_t)&ifr, &rval, CRED());
                if (rc != 0) {
                        RDSV3_DPRINTF2("rdsv3_ioctl",
                            "ksocket_ioctl failed: %d, name: %s cmd: 0x%x",
                            rc, ifr.ifr_name, cmd);

                        break;
                }

                RDSV3_DPRINTF2("rdsv3_ioctl", "2. name: %s", ifr.ifr_name);

                (void) ddi_copyout(&ifr, (void *)arg,
                    sizeof (struct ifreq), 0);
                break;

        default:
                if ((cmd >= RDS_INFO_FIRST) &&
                    (cmd <= RDS_INFO_LAST)) {
                        return (rdsv3_info_ioctl((struct rsock *)proto_handle,
                            cmd, (char *)arg, rvalp));
                }
                RDSV3_DPRINTF2("rdsv3_ioctl", "Unknown ioctl cmd: %d",  cmd);
                cmn_err(CE_CONT, "unsupported IOCTL cmd: %d \n", cmd);
                rval = EOPNOTSUPP;
        }

        (void) ksocket_close(so4, CRED());

        RDSV3_DPRINTF4("rdsv3_ioctl", "return: %d cmd: %d", rval, cmd);

        *rvalp = rval;
        return (rval);
}

static int
rdsv3_cancel_sent_to(struct rdsv3_sock *rs, char *optval, int len)
{
        struct sockaddr_in sin;

        /* racing with another thread binding seems ok here */
        if (rs->rs_bound_addr == 0)
                return (-ENOTCONN); /* XXX not a great errno */

        if (len < sizeof (struct sockaddr_in))
                return (-EINVAL);

        if (ddi_copyin((void *)optval, &sin, sizeof (struct sockaddr_in),
            0) != 0) {
                RDSV3_DPRINTF2("rdsv3_cancel_sent_to", "ddi_copyin failed sin");
                return (-EFAULT);
        }

        rdsv3_send_drop_to(rs, &sin);

        return (0);
}

static int
rdsv3_set_bool_option(unsigned char *optvar, char *optval, int optlen)
{
        int value = *optval;

        if (optlen < sizeof (int))
                return (-EINVAL);
        *optvar = !!value;
        return (0);
}

static int
rdsv3_cong_monitor(struct rdsv3_sock *rs, char *optval, int optlen)
{
        int ret;

        ret = rdsv3_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
        if (ret == 0) {
                if (rs->rs_cong_monitor) {
                        rdsv3_cong_add_socket(rs);
                } else {
                        rdsv3_cong_remove_socket(rs);
                        rs->rs_cong_mask = 0;
                        rs->rs_cong_notify = 0;
                }
        }
        return (ret);
}

/*ARGSUSED*/
static int
rdsv3_setsockopt(sock_lower_handle_t proto_handle, int level,
    int optname, const void *optval, socklen_t optlen, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock       *rs = rdsv3_sk_to_rs(sk);
        int     ret = 0;

        RDSV3_DPRINTF4("rdsv3_setsockopt", "enter(%p %d %d)",
            rs, level, optname);

        switch (optname) {
        case RDS_CANCEL_SENT_TO:
                ret = rdsv3_cancel_sent_to(rs, (char *)optval, optlen);
                break;
        case RDS_GET_MR:
                ret = rdsv3_get_mr(rs, optval, optlen);
                break;
        case RDS_GET_MR_FOR_DEST:
                ret = rdsv3_get_mr_for_dest(rs, optval, optlen);
                break;
        case RDS_FREE_MR:
                ret = rdsv3_free_mr(rs, optval, optlen);
                break;
        case RDS_RECVERR:
                ret = rdsv3_set_bool_option(&rs->rs_recverr,
                    (char *)optval, optlen);
                break;
        case RDS_CONG_MONITOR:
                ret = rdsv3_cong_monitor(rs, (char *)optval, optlen);
                break;
        case SO_SNDBUF:
                sk->sk_sndbuf = *(uint_t *)optval;
                return (ret);
        case SO_RCVBUF:
                sk->sk_rcvbuf = *(uint_t *)optval;
                return (ret);
        default:
#if 1
                break;
#else
                ret = -ENOPROTOOPT;
#endif
        }
        return (ret);
}

/* XXX */
/*ARGSUSED*/
static int
rdsv3_getsockopt(sock_lower_handle_t proto_handle, int level,
    int optname, void *optval, socklen_t *optlen, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock       *rs = rdsv3_sk_to_rs(sk);
        int ret = 0;

        RDSV3_DPRINTF4("rdsv3_getsockopt", "enter(%p %d %d)",
            rs, optname, *optlen);

        switch (optname) {
        case SO_SNDBUF:
                RDSV3_DPRINTF4("rdsv3_getsockopt", "SO_SNDBUF(%d)",
                    sk->sk_sndbuf);
                if (*optlen != 0) {
                        *((int *)optval) = sk->sk_sndbuf;
                        *optlen = sizeof (uint_t);
                }
                return (ret);
        case SO_RCVBUF:
                RDSV3_DPRINTF4("rdsv3_getsockopt", "SO_RCVBUF(%d)",
                    sk->sk_rcvbuf);
                if (*optlen != 0) {
                        *((int *)optval) = sk->sk_rcvbuf;
                        *optlen = sizeof (uint_t);
                }
                return (ret);
        case RDS_RECVERR:
                RDSV3_DPRINTF4("rdsv3_getsockopt", "RDSV3_RECVERR(%d)",
                    rs->rs_recverr);
                if (*optlen < sizeof (int))
                        return (-EINVAL);
                else {
                        *(int *)optval = rs->rs_recverr;
                        *optlen = sizeof (int);
                }
                return (0);
        default:
                RDSV3_DPRINTF2("rdsv3_getsockopt",
                    "Unknown: level: %d optname: %d", level, optname);
                ret = -ENOPROTOOPT;
        }

        RDSV3_DPRINTF4("rdsv3_getsockopt", "return(%p %d %d)",
            rs, optname, ret);
        return (ret);
}

/*ARGSUSED*/
static int rdsv3_connect(sock_lower_handle_t proto_handle,
    const struct sockaddr *addr, socklen_t addr_len, sock_connid_t *conn,
    cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct sockaddr_in *sin = (struct sockaddr_in *)addr;
        struct rdsv3_sock       *rs = rdsv3_sk_to_rs(sk);
        int ret = 0;

        RDSV3_DPRINTF4("rdsv3_connect", "Enter(rs: %p)", rs);

        mutex_enter(&sk->sk_lock);

        if (addr_len != sizeof (struct sockaddr_in)) {
                ret = -EINVAL;
                goto out;
        }

        if (sin->sin_family != AF_INET_OFFLOAD) {
                ret = -EAFNOSUPPORT;
                goto out;
        }

        if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
                ret = -EDESTADDRREQ;
                goto out;
        }

        rs->rs_conn_addr = sin->sin_addr.s_addr;
        rs->rs_conn_port = sin->sin_port;

        sk->sk_upcalls->su_connected(sk->sk_upper_handle, 0, NULL, -1);

        RDSV3_DPRINTF4("rdsv3_connect", "Return(rs: %p)", rs);

out:
        mutex_exit(&sk->sk_lock);
        return (ret);
}

/*ARGSUSED*/
static int
rdsv3_shutdown(sock_lower_handle_t proto_handle, int how, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);

        RDSV3_DPRINTF4("rdsv3_shutdown", "Enter(rs: %p)", rs);

        return (0);
}

/*ARGSUSED*/
void
rdsv3_activate(sock_lower_handle_t proto_handle,
    sock_upper_handle_t sock_handle, sock_upcalls_t *sock_upcalls,
    int flags, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);

        RDSV3_DPRINTF4("rdsv3_activate", "Enter(rs: %p)", rs);

        sk->sk_upcalls = sock_upcalls;
        sk->sk_upper_handle = sock_handle;

        RDSV3_DPRINTF4("rdsv3_activate", "Return (rs: %p)", rs);
}


/* ARGSUSED */
int
rdsv3_send_uio(sock_lower_handle_t proto_handle, uio_t *uio,
    struct nmsghdr *msg, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);
        int ret;

        RDSV3_DPRINTF4("rdsv3_send_uio", "Enter(rs: %p)", rs);
        ret = rdsv3_sendmsg(rs, uio, msg, uio->uio_resid);

        RDSV3_DPRINTF4("rdsv3_send_uio", "Return(rs: %p ret %d)", rs, ret);
        if (ret < 0) {
                return (-ret);
        }

        return (0);
}

/* ARGSUSED */
int
rdsv3_recv_uio(sock_lower_handle_t proto_handle, uio_t *uio,
    struct nmsghdr *msg, cred_t *cr)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);
        int ret;

        RDSV3_DPRINTF4("rdsv3_recv_uio", "Enter (rs: %p)", rs);
        ret = rdsv3_recvmsg(rs, uio, msg, uio->uio_resid, msg->msg_flags);

        RDSV3_DPRINTF4("rdsv3_recv_uio", "Return(rs: %p ret %d)", rs, ret);

        if (ret < 0) {
                return (-ret);
        }

        return (0);
}

/*ARGSUSED*/
int
rdsv3_getpeername(sock_lower_handle_t  proto_handle, struct sockaddr *addr,
    socklen_t *addr_len, cred_t *cr)
{
        struct sockaddr_in *sin = (struct sockaddr_in *)addr;
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);

        RDSV3_DPRINTF2("rdsv3_getpeername", "enter(rs: %p)", rs);

        (void) memset(sin->sin_zero, 0, sizeof (sin->sin_zero));

        /* racey, don't care */
        if (!rs->rs_conn_addr)
                return (-ENOTCONN);

        sin->sin_port = rs->rs_conn_port;
        sin->sin_addr.s_addr = rs->rs_conn_addr;

        sin->sin_family = AF_INET_OFFLOAD;

        *addr_len = sizeof (*sin);
        return (0);
}

void
rdsv3_clrflowctrl(sock_lower_handle_t proto_handle)
{
        struct rsock *sk = (struct rsock *)proto_handle;
        struct rdsv3_sock *rs = rdsv3_sk_to_rs(sk);

        RDSV3_DPRINTF2("rdsv3_clrflowctrl", "enter(rs: %p)", rs);
}

#ifndef __lock_lint
static struct sock_downcalls_s rdsv3_sock_downcalls = {
        .sd_close =             rdsv3_release,
        .sd_bind =              rdsv3_bind,
        .sd_connect =           rdsv3_connect,
        .sd_accept =            NULL,
        .sd_getsockname =       rdsv3_getname,
        .sd_poll =              rdsv3_poll,
        .sd_ioctl =             rdsv3_ioctl,
        .sd_listen =            NULL,
        .sd_shutdown =          rdsv3_shutdown,
        .sd_setsockopt =        rdsv3_setsockopt,
        .sd_getsockopt =        rdsv3_getsockopt,
        .sd_send_uio =          rdsv3_send_uio,
        .sd_recv_uio =          rdsv3_recv_uio,
        .sd_activate =          rdsv3_activate,
        .sd_getpeername =       rdsv3_getpeername,
        .sd_send =              NULL,
        .sd_clr_flowctrl =      NULL
};
#else
static struct sock_downcalls_s rdsv3_sock_downcalls = {
        rdsv3_activate,
        NULL,
        rdsv3_bind,
        NULL,
        rdsv3_connect,
        rdsv3_getpeername,
        rdsv3_getname,
        rdsv3_getsockopt,
        rdsv3_setsockopt,
        NULL,
        rdsv3_send_uio,
        rdsv3_recv_uio,
        rdsv3_poll,
        rdsv3_shutdown,
        NULL,
        rdsv3_ioctl,
        rdsv3_release
};
#endif

sock_lower_handle_t
rdsv3_create(int family, int type, int proto, sock_downcalls_t **sock_downcalls,
    uint_t *smodep, int *errorp, int flags, cred_t *credp)
{
        struct rdsv3_sock       *rs;
        struct rsock            *sk;

        RDSV3_DPRINTF4("rdsv3_create", "Enter (family: %d type: %d, proto: %d "
            "flags: %d", family, type, proto, flags);

        sk = rdsv3_sk_alloc();
        if (sk == NULL)
                return (NULL);
        rdsv3_sock_init_data(sk);

        rs = rdsv3_sk_to_rs(sk);
        rs->rs_sk = sk;
        mutex_init(&rs->rs_lock, NULL, MUTEX_DRIVER, NULL);
        rw_init(&rs->rs_recv_lock, NULL, RW_DRIVER, NULL);
        list_create(&rs->rs_send_queue, sizeof (struct rdsv3_message),
            offsetof(struct rdsv3_message, m_sock_item));
        list_create(&rs->rs_recv_queue, sizeof (struct rdsv3_incoming),
            offsetof(struct rdsv3_incoming, i_item));
        list_create(&rs->rs_notify_queue, sizeof (struct rdsv3_notifier),
            offsetof(struct rdsv3_notifier, n_list));
        mutex_init(&rs->rs_rdma_lock, NULL, MUTEX_DRIVER, NULL);
        avl_create(&rs->rs_rdma_keys, rdsv3_mr_compare,
            sizeof (struct rdsv3_mr), offsetof(struct rdsv3_mr, r_rb_node));
        mutex_init(&rs->rs_conn_lock, NULL, MUTEX_DRIVER, NULL);
        mutex_init(&rs->rs_congested_lock, NULL, MUTEX_DRIVER, NULL);
        cv_init(&rs->rs_congested_cv, NULL, CV_DRIVER, NULL);
        rs->rs_cred = credp;
        rs->rs_zoneid = getzoneid();
        crhold(credp);

        mutex_enter(&rdsv3_sock_lock);
        list_insert_tail(&rdsv3_sock_list, rs);
        rdsv3_sock_count++;
        /* Initialize RDMA/IB on the 1st socket if not done at attach */
        if (rdsv3_sock_count == 1) {
                rdsv3_rdma_init();
        }
        mutex_exit(&rdsv3_sock_lock);

        *errorp = 0;
        *smodep = SM_ATOMIC;
        *sock_downcalls = &rdsv3_sock_downcalls;

        RDSV3_DPRINTF4("rdsv3_create", "Return: %p", rs);

        return ((sock_lower_handle_t)rdsv3_rs_to_sk(rs));
}

void
rdsv3_sock_addref(struct rdsv3_sock *rs)
{
        RDSV3_DPRINTF4("rdsv3_sock_addref", "Enter(rs: %p)", rs);
        rdsv3_sk_sock_hold(rdsv3_rs_to_sk(rs));
}

void
rdsv3_sock_put(struct rdsv3_sock *rs)
{
        RDSV3_DPRINTF4("rdsv3_sock_put", "Enter(rs: %p)", rs);
        rdsv3_sk_sock_put(rdsv3_rs_to_sk(rs));
}

static void
rdsv3_sock_inc_info(struct rsock *sock, unsigned int len,
    struct rdsv3_info_iterator *iter, struct rdsv3_info_lengths *lens)
{
        struct rdsv3_sock *rs;
        struct rdsv3_incoming *inc;
        unsigned int total = 0;

        RDSV3_DPRINTF4("rdsv3_sock_inc_info", "Enter(rs: %p)",
            rdsv3_sk_to_rs(sock));

        len /= sizeof (struct rds_info_message);

        mutex_enter(&rdsv3_sock_lock);

        RDSV3_FOR_EACH_LIST_NODE(rs, &rdsv3_sock_list, rs_item) {
                rw_enter(&rs->rs_recv_lock, RW_READER);

                /* XXX too lazy to maintain counts.. */
                RDSV3_FOR_EACH_LIST_NODE(inc, &rs->rs_recv_queue, i_item) {
                        total++;
                        if (total <= len)
                                rdsv3_inc_info_copy(inc, iter, inc->i_saddr,
                                    rs->rs_bound_addr, 1);
                }

                rw_exit(&rs->rs_recv_lock);
        }

        mutex_exit(&rdsv3_sock_lock);

        lens->nr = total;
        lens->each = sizeof (struct rds_info_message);

        RDSV3_DPRINTF4("rdsv3_sock_inc_info", "return(rs: %p)",
            rdsv3_sk_to_rs(sock));
}

static void
rdsv3_sock_info(struct rsock *sock, unsigned int len,
    struct rdsv3_info_iterator *iter, struct rdsv3_info_lengths *lens)
{
        struct rds_info_socket sinfo;
        struct rdsv3_sock *rs;
        unsigned long bytes;

        RDSV3_DPRINTF4("rdsv3_sock_info", "Enter(rs: %p)",
            rdsv3_sk_to_rs(sock));

        len /= sizeof (struct rds_info_socket);

        mutex_enter(&rdsv3_sock_lock);

        if ((len < rdsv3_sock_count) || (iter->addr == NULL))
                goto out;

        bytes = sizeof (struct rds_info_socket);
        RDSV3_FOR_EACH_LIST_NODE(rs, &rdsv3_sock_list, rs_item) {
                sinfo.sndbuf = rdsv3_sk_sndbuf(rs);
                sinfo.rcvbuf = rdsv3_sk_rcvbuf(rs);
                sinfo.bound_addr = rs->rs_bound_addr;
                sinfo.connected_addr = rs->rs_conn_addr;
                sinfo.bound_port = rs->rs_bound_port;
                sinfo.connected_port = rs->rs_conn_port;

                rdsv3_info_copy(iter, &sinfo, bytes);
        }

        RDSV3_DPRINTF4("rdsv3_sock_info", "Return(rs: %p)",
            rdsv3_sk_to_rs(sock));

out:
        lens->nr = rdsv3_sock_count;
        lens->each = sizeof (struct rds_info_socket);

        mutex_exit(&rdsv3_sock_lock);
}

rdsv3_delayed_work_t    *rdsv3_rdma_dwp = NULL;
uint_t                  rdsv3_rdma_init_delay = 5; /* secs */
extern void rdsv3_rdma_init_worker(struct rdsv3_work_s *work);

void
rdsv3_exit(void)
{
        RDSV3_DPRINTF4("rdsv3_exit", "Enter");

        if (rdsv3_rdma_dwp) {
                rdsv3_cancel_delayed_work(rdsv3_rdma_dwp);
        }

        (void) ddi_taskq_dispatch(rdsv3_taskq, rdsv3_rdma_exit,
            NULL, DDI_SLEEP);
        while (rdsv3_rdma_listen_id != NULL) {
#ifndef __lock_lint
                RDSV3_DPRINTF5("rdsv3", "%s-%d Waiting for rdsv3_rdma_exit",
                    __func__, __LINE__);
#endif
                delay(drv_usectohz(1000));
        }

        rdsv3_conn_exit();
        rdsv3_cong_exit();
        rdsv3_sysctl_exit();
        rdsv3_threads_exit();
        rdsv3_stats_exit();
        rdsv3_info_deregister_func(RDS_INFO_SOCKETS, rdsv3_sock_info);
        rdsv3_info_deregister_func(RDS_INFO_RECV_MESSAGES,
            rdsv3_sock_inc_info);

        if (rdsv3_rdma_dwp) {
                kmem_free(rdsv3_rdma_dwp, sizeof (rdsv3_delayed_work_t));
                rdsv3_rdma_dwp = NULL;
        }

        RDSV3_DPRINTF4("rdsv3_exit", "Return");
}

/*ARGSUSED*/
int
rdsv3_init()
{
        int ret;

        RDSV3_DPRINTF4("rdsv3_init", "Enter");

        rdsv3_cong_init();

        ret = rdsv3_conn_init();
        if (ret)
                goto out;
        ret = rdsv3_threads_init();
        if (ret)
                goto out_conn;
        ret = rdsv3_sysctl_init();
        if (ret)
                goto out_threads;
        ret = rdsv3_stats_init();
        if (ret)
                goto out_sysctl;

        rdsv3_info_register_func(RDS_INFO_SOCKETS, rdsv3_sock_info);
        rdsv3_info_register_func(RDS_INFO_RECV_MESSAGES, rdsv3_sock_inc_info);

        /* rdsv3_rdma_init need to be called with a little delay */
        rdsv3_rdma_dwp = kmem_zalloc(sizeof (rdsv3_delayed_work_t), KM_SLEEP);
        RDSV3_INIT_DELAYED_WORK(rdsv3_rdma_dwp, rdsv3_rdma_init_worker);
        rdsv3_queue_delayed_work(rdsv3_wq, rdsv3_rdma_dwp,
            rdsv3_rdma_init_delay);

        RDSV3_DPRINTF4("rdsv3_init", "Return");

        goto out;

out_sysctl:
        rdsv3_sysctl_exit();
out_threads:
        rdsv3_threads_exit();
out_conn:
        rdsv3_conn_exit();
        rdsv3_cong_exit();
out:
        return (ret);
}