/*      $NetBSD: octeon_ipd.c,v 1.8 2021/01/04 17:22:59 thorpej Exp $   */

/*
* Copyright (c) 2007 Internet Initiative Japan, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: octeon_ipd.c,v 1.8 2021/01/04 17:22:59 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <mips/locore.h>
#include <mips/cavium/octeonvar.h>
#include <mips/cavium/dev/octeon_ciureg.h>
#include <mips/cavium/dev/octeon_fpareg.h>
#include <mips/cavium/dev/octeon_fpavar.h>
#include <mips/cavium/dev/octeon_pipreg.h>
#include <mips/cavium/dev/octeon_ipdreg.h>
#include <mips/cavium/dev/octeon_ipdvar.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>

#define IP_OFFSET(data, word2) \
       ((uintptr_t)(data) + (uintptr_t)__SHIFTOUT(word2, PIP_WQE_WORD2_IP_OFFSET))

/* XXX */
void
octipd_init(struct octipd_attach_args *aa, struct octipd_softc **rsc)
{
       struct octipd_softc *sc;
       int status;

       sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
       sc->sc_port = aa->aa_port;
       sc->sc_regt = aa->aa_regt;
       sc->sc_first_mbuff_skip = aa->aa_first_mbuff_skip;
       sc->sc_not_first_mbuff_skip = aa->aa_not_first_mbuff_skip;

       status = bus_space_map(sc->sc_regt, IPD_BASE, IPD_SIZE, 0,
           &sc->sc_regh);
       if (status != 0)
               panic("can't map %s space", "ipd register");

       *rsc = sc;
}

#define _IPD_RD8(sc, off) \
       bus_space_read_8((sc)->sc_regt, (sc)->sc_regh, (off))
#define _IPD_WR8(sc, off, v) \
       bus_space_write_8((sc)->sc_regt, (sc)->sc_regh, (off), (v))

int
octipd_enable(struct octipd_softc *sc)
{
       uint64_t ctl_status;

       ctl_status = _IPD_RD8(sc, IPD_CTL_STATUS_OFFSET);
       SET(ctl_status, IPD_CTL_STATUS_IPD_EN);
       _IPD_WR8(sc, IPD_CTL_STATUS_OFFSET, ctl_status);

       return 0;
}

int
octipd_config(struct octipd_softc *sc)
{
       uint64_t first_mbuff_skip;
       uint64_t not_first_mbuff_skip;
       uint64_t packet_mbuff_size;
       uint64_t first_next_ptr_back;
       uint64_t second_next_ptr_back;
       uint64_t sqe_fpa_queue;
       uint64_t ctl_status;

       /* XXX XXX XXX */
       first_mbuff_skip = 0;
       SET(first_mbuff_skip, (sc->sc_first_mbuff_skip / 8) & IPD_1ST_MBUFF_SKIP_SZ);
       _IPD_WR8(sc, IPD_1ST_MBUFF_SKIP_OFFSET, first_mbuff_skip);
       /* XXX XXX XXX */

       /* XXX XXX XXX */
       not_first_mbuff_skip = 0;
       SET(not_first_mbuff_skip, (sc->sc_not_first_mbuff_skip / 8) &
           IPD_NOT_1ST_MBUFF_SKIP_SZ);
       _IPD_WR8(sc, IPD_NOT_1ST_MBUFF_SKIP_OFFSET, not_first_mbuff_skip);
       /* XXX XXX XXX */

       packet_mbuff_size = 0;
       SET(packet_mbuff_size, (FPA_RECV_PKT_POOL_SIZE / 8) &
           IPD_PACKET_MBUFF_SIZE_MB_SIZE);
       _IPD_WR8(sc, IPD_PACKET_MBUFF_SIZE_OFFSET, packet_mbuff_size);

       first_next_ptr_back = 0;
       SET(first_next_ptr_back, (sc->sc_first_mbuff_skip / 128) & IPD_1ST_NEXT_PTR_BACK_BACK);
       _IPD_WR8(sc, IPD_1ST_NEXT_PTR_BACK_OFFSET, first_next_ptr_back);

       second_next_ptr_back = 0;
       SET(second_next_ptr_back, (sc->sc_not_first_mbuff_skip / 128) &
           IPD_2ND_NEXT_PTR_BACK_BACK);
       _IPD_WR8(sc, IPD_2ND_NEXT_PTR_BACK_OFFSET, second_next_ptr_back);

       sqe_fpa_queue = 0;
       SET(sqe_fpa_queue, FPA_WQE_POOL & IPD_WQE_FPA_QUEUE_WQE_QUE);
       _IPD_WR8(sc, IPD_WQE_FPA_QUEUE_OFFSET, sqe_fpa_queue);

       ctl_status = _IPD_RD8(sc, IPD_CTL_STATUS_OFFSET);
       CLR(ctl_status, IPD_CTL_STATUS_OPC_MODE);
       SET(ctl_status,
           __SHIFTIN(IPD_CTL_STATUS_OPC_MODE_ALL, IPD_CTL_STATUS_OPC_MODE));
       SET(ctl_status, IPD_CTL_STATUS_PBP_EN);

       /*
       * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       *          from SDK
       * SET(ctl_status, IPD_CTL_STATUS_LEN_M8);
       * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       */

       _IPD_WR8(sc, IPD_CTL_STATUS_OFFSET, ctl_status);

       return 0;
}

/*
* octeon work queue entry offload
* L3 error & L4 error
*/
void
octipd_offload(uint64_t word2, void *data, int *rcflags)
{
       int cflags;

       if (ISSET(word2, PIP_WQE_WORD2_IP_NI))
               return;

       cflags = 0;

       if (!ISSET(word2, PIP_WQE_WORD2_IP_V6))
               SET(cflags, M_CSUM_IPv4);

       if (ISSET(word2, PIP_WQE_WORD2_IP_TU)) {
               SET(cflags,
                   !ISSET(word2, PIP_WQE_WORD2_IP_V6) ?
                   (M_CSUM_TCPv4 | M_CSUM_UDPv4) :
                   (M_CSUM_TCPv6 | M_CSUM_UDPv6));
       }

       /* check L3 (IP) error */
       if (ISSET(word2, PIP_WQE_WORD2_IP_IE)) {
               struct ip *ip;

               switch (word2 & PIP_WQE_WORD2_IP_OPECODE) {
               case IPD_WQE_L3_V4_CSUM_ERR:
                       /* CN31XX Pass 1.1 Errata */
                       ip = (struct ip *)(IP_OFFSET(data, word2));
                       if (ip->ip_hl == 5)
                               SET(cflags, M_CSUM_IPv4_BAD);
                       break;
               default:
                       break;
               }
       }

       /* check L4 (UDP / TCP) error */
       if (ISSET(word2, PIP_WQE_WORD2_IP_LE)) {
               switch (word2 & PIP_WQE_WORD2_IP_OPECODE) {
               case IPD_WQE_L4_CSUM_ERR:
                       SET(cflags, M_CSUM_TCP_UDP_BAD);
                       break;
               default:
                       break;
               }
       }

       *rcflags = cflags;
}

void
octipd_sub_port_fcs(struct octipd_softc *sc, int enable)
{
       uint64_t sub_port_fcs;

       sub_port_fcs = _IPD_RD8(sc, IPD_SUB_PORT_FCS_OFFSET);
       if (enable == 0)
               CLR(sub_port_fcs, __BIT(sc->sc_port));
       else
               SET(sub_port_fcs, __BIT(sc->sc_port));
       _IPD_WR8(sc, IPD_SUB_PORT_FCS_OFFSET, sub_port_fcs);
}

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