FreeBSD/Linux Kernel Cross Reference
sys/dev/ixgbe/if_fdir.c

     /******************************************************************************
     
       Copyright (c) 2001-2017, Intel Corporation
       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.
    
       3. Neither the name of the Intel Corporation nor the names of its
          contributors may be used to endorse or promote products derived from
          this software without specific prior written permission.
    
      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
    
    ******************************************************************************/
    /*$FreeBSD$*/
    
    #include "ixgbe.h"
    
    #ifdef IXGBE_FDIR
    
    void
    ixgbe_init_fdir(struct ixgbe_softc *sc)
    {
            u32 hdrm = 32 << fdir_pballoc;
    
            if (!(sc->feat_en & IXGBE_FEATURE_FDIR))
                    return;
    
            sc->hw.mac.ops.setup_rxpba(&sc->hw, 0, hdrm,
                PBA_STRATEGY_EQUAL);
            ixgbe_init_fdir_signature_82599(&sc->hw, fdir_pballoc);
    } /* ixgbe_init_fdir */
    
    void
    ixgbe_reinit_fdir(void *context)
    {
            if_ctx_t       ctx = context;
            struct ixgbe_softc *sc = iflib_get_softc(ctx);
            if_t           ifp = iflib_get_ifp(ctx);
    
            if (!(sc->feat_en & IXGBE_FEATURE_FDIR))
                    return;
            if (sc->fdir_reinit != 1) /* Shouldn't happen */
                    return;
            ixgbe_reinit_fdir_tables_82599(&sc->hw);
            sc->fdir_reinit = 0;
            /* re-enable flow director interrupts */
            IXGBE_WRITE_REG(&sc->hw, IXGBE_EIMS, IXGBE_EIMS_FLOW_DIR);
            /* Restart the interface */
            if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0);
    } /* ixgbe_reinit_fdir */
    
    /************************************************************************
     * ixgbe_atr
     *
     *   Parse packet headers so that Flow Director can make
     *   a hashed filter table entry allowing traffic flows
     *   to be identified and kept on the same cpu.  This
     *   would be a performance hit, but we only do it at
     *   IXGBE_FDIR_RATE of packets.
     ************************************************************************/
    void
    ixgbe_atr(struct tx_ring *txr, struct mbuf *mp)
    {
            struct ixgbe_softc             *sc = txr->sc;
            struct ix_queue            *que;
            struct ip                  *ip;
            struct tcphdr              *th;
            struct udphdr              *uh;
            struct ether_vlan_header   *eh;
            union ixgbe_atr_hash_dword input = {.dword = 0};
            union ixgbe_atr_hash_dword common = {.dword = 0};
            int                        ehdrlen, ip_hlen;
            u16                        etype;
    
            eh = mtod(mp, struct ether_vlan_header *);
            if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
                    ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
                    etype = eh->evl_proto;
            } else {
                    ehdrlen = ETHER_HDR_LEN;
                   etype = eh->evl_encap_proto;
           }
   
           /* Only handling IPv4 */
           if (etype != htons(ETHERTYPE_IP))
                   return;
   
           ip = (struct ip *)(mp->m_data + ehdrlen);
           ip_hlen = ip->ip_hl << 2;
   
           /* check if we're UDP or TCP */
           switch (ip->ip_p) {
           case IPPROTO_TCP:
                   th = (struct tcphdr *)((caddr_t)ip + ip_hlen);
                   /* src and dst are inverted */
                   common.port.dst ^= th->th_sport;
                   common.port.src ^= th->th_dport;
                   input.formatted.flow_type ^= IXGBE_ATR_FLOW_TYPE_TCPV4;
                   break;
           case IPPROTO_UDP:
                   uh = (struct udphdr *)((caddr_t)ip + ip_hlen);
                   /* src and dst are inverted */
                   common.port.dst ^= uh->uh_sport;
                   common.port.src ^= uh->uh_dport;
                   input.formatted.flow_type ^= IXGBE_ATR_FLOW_TYPE_UDPV4;
                   break;
           default:
                   return;
           }
   
           input.formatted.vlan_id = htobe16(mp->m_pkthdr.ether_vtag);
           if (mp->m_pkthdr.ether_vtag)
                   common.flex_bytes ^= htons(ETHERTYPE_VLAN);
           else
                   common.flex_bytes ^= etype;
           common.ip ^= ip->ip_src.s_addr ^ ip->ip_dst.s_addr;
   
           que = &sc->queues[txr->me];
           /*
            * This assumes the Rx queue and Tx
            * queue are bound to the same CPU
            */
           ixgbe_fdir_add_signature_filter_82599(&sc->hw,
               input, common, que->msix);
   } /* ixgbe_atr */
   
   #else
   
   /* TASK_INIT needs this function defined regardless if it's enabled */
   void
   ixgbe_reinit_fdir(void *context)
   {
           UNREFERENCED_PARAMETER(context);
   } /* ixgbe_reinit_fdir */
   
   void
   ixgbe_atr(struct tx_ring *txr, struct mbuf *mp)
   {
           UNREFERENCED_2PARAMETER(txr, mp);
   } /* ixgbe_atr */
   
   #endif

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