if_fdir.c

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      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.
 
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/*$FreeBSD$*/
 
#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);
        struct ifnet   *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 */
        ifp->if_drv_flags |= IFF_DRV_RUNNING;
} /* 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