/*      $NetBSD: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $  */

/*
* Copyright (c) 2018 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>

#include <net/rss_config.h>
#include <net/toeplitz.h>

#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip6.h>

/*
* Same as FreeBSD.
*
* This rss key is assumed for verification suite in many intel Gigabit and
* 10 Gigabit Controller specifications.
*/
static uint8_t rss_default_key[RSS_KEYSIZE] = {
       0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
       0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
       0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
       0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
       0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa,
};

#ifdef NOTYET
/*
* Same as DragonFlyBSD.
*
* This rss key make rss hash value symmetric, that is, the hash value
* calculated by func("source address", "destination address") equals to
* the hash value calculated by func("destination address", "source address").
*/
static uint8_t rss_symmetric_key[RSS_KEYSIZE] = {
       0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
       0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
       0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
       0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
       0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
};
#endif

/*
* sizeof(key) must be more than or equal to RSS_KEYSIZE.
*/
void
rss_getkey(uint8_t *key)
{

       memcpy(key, rss_default_key, sizeof(rss_default_key));
}

/*
* Calculate rss hash value from IPv4 mbuf.
* This function should be called before ip_input().
*/
uint32_t
rss_toeplitz_hash_from_mbuf_ipv4(const struct mbuf *m, u_int flag)
{
       struct ip *ip;
       int hlen;
       uint8_t key[RSS_KEYSIZE];

       KASSERT((m->m_flags & M_PKTHDR) != 0);
       KASSERT(m->m_len >= sizeof (struct ip));

       ip = mtod(m, struct ip *);
       KASSERT(ip->ip_v == IPVERSION);

       hlen = ip->ip_hl << 2;
       if (hlen < sizeof(struct ip))
               return 0;

       rss_getkey(key);

       switch (ip->ip_p) {
       case IPPROTO_TCP:
       {
               if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
                       if (m->m_len >= hlen + sizeof(struct tcphdr)) {
                               struct tcphdr *th;

                               th = (struct tcphdr *)(mtod(m, char *) + hlen);
                               return toeplitz_vhash(key, sizeof(key),
                                   /* ip_src and ip_dst in struct ip must be sequential */
                                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                                   /* th_sport and th_dport in tcphdr must be sequential */
                                   &th->th_sport, sizeof(th->th_sport) * 2,
                                   NULL);
                       } else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
                               uint16_t ports[2];

                               /* ditto */
                               m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
                                   sizeof(ports), ports);
                               return toeplitz_vhash(key, sizeof(key),
                                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                                   ports, sizeof(ports),
                                   NULL);
                       }
               }
               /*
                * Treat as raw packet.
                */
               return toeplitz_vhash(key, sizeof(key),
                   /* ditto */
                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                   NULL);
       }
       case IPPROTO_UDP:
       {
               if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
                       if (m->m_len >= hlen + sizeof(struct udphdr)) {
                               struct udphdr *uh;

                               uh = (struct udphdr *)(mtod(m, char *) + hlen);
                               return toeplitz_vhash(key, sizeof(key),
                                   /* ip_src and ip_dst in struct ip must sequential */
                                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                                   /* uh_sport and uh_dport in udphdr must be sequential */
                                   &uh->uh_sport, sizeof(uh->uh_sport) * 2,
                                   NULL);
                       } else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
                               uint16_t ports[2];

                               /* ditto */
                               m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
                                   sizeof(ports), ports);
                               return toeplitz_vhash(key, sizeof(key),
                                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                                   ports, sizeof(ports),
                                   NULL);
                       }
               }
               /*
                * Treat as raw packet.
                */
               return toeplitz_vhash(key, sizeof(key),
                   /* ditto */
                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                   NULL);
       }
       /*
        * Other protocols are treated as raw packets to apply RPS.
        */
       default:
               return toeplitz_vhash(key, sizeof(key),
                   /* ditto */
                   &ip->ip_src, sizeof(ip->ip_src) * 2,
                   NULL);
       }
}

/*
* Calculate rss hash value from IPv6 mbuf.
* This function should be called before ip6_input().
*/
uint32_t
rss_toeplitz_hash_from_mbuf_ipv6(const struct mbuf *m, u_int flag)
{
       struct ip6_hdr *ip6;
       int hlen;
       uint8_t key[RSS_KEYSIZE];

       KASSERT((m->m_flags & M_PKTHDR) != 0);
       KASSERT(m->m_len >= sizeof (struct ip6_hdr));

       ip6 = mtod(m, struct ip6_hdr *);
       KASSERT((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);

       hlen = sizeof(struct ip6_hdr);
       rss_getkey(key);

       switch (ip6->ip6_nxt) {
       case IPPROTO_TCP:
       {
               if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
                       if (m->m_len >= hlen + sizeof(struct tcphdr)) {
                               struct tcphdr *th;

                               th = (struct tcphdr *)(mtod(m, char *) + hlen);
                               return toeplitz_vhash(key, sizeof(key),
                                   /* ip6_src and ip6_dst in ip6_hdr must be sequential */
                                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                                   /* th_sport and th_dport in tcphdr must be sequential */
                                   &th->th_sport, sizeof(th->th_sport) * 2,
                                   NULL);
                       } else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
                               uint16_t ports[2];

                               /* ditto */
                               m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
                                   sizeof(ports), ports);
                               return toeplitz_vhash(key, sizeof(key),
                                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                                   ports, sizeof(ports),
                                   NULL);
                       }
               }
               /*
                * Treat as raw packet.
                */
               return toeplitz_vhash(key, sizeof(key),
                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                   NULL);
       }
       case IPPROTO_UDP:
       {
               if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
                       if (m->m_len >= hlen + sizeof(struct udphdr)) {
                               struct udphdr *uh;

                               uh = (struct udphdr *)(mtod(m, char *) + hlen);
                               return toeplitz_vhash(key, sizeof(key),
                                   /* ip6_src and ip6_dst in ip6_hdr must sequential */
                                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                                   /* uh_sport and uh_dport in udphdr must be sequential */
                                   &uh->uh_sport, sizeof(uh->uh_sport) * 2,
                                   NULL);
                       } else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
                               uint16_t ports[2];

                               /* ditto */
                               m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
                                   sizeof(ports), ports);
                               return toeplitz_vhash(key, sizeof(key),
                                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                                   &ports, sizeof(ports),
                                   NULL);
                       }
               }
               /*
                * Treat as raw packet.
                */
               return toeplitz_vhash(key, sizeof(key),
                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                   NULL);
       }
       /*
        * Other protocols are treated as raw packets to apply RPS.
        */
       default:
               return toeplitz_vhash(key, sizeof(key),
                   &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
                   NULL);
       }

       return 0;
}

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