xref: /src/sys/dev/pci/ixgbe/if_fdir.c

/* $NetBSD: if_fdir.c,v 1.4 2021/04/30 06:41:36 msaitoh Exp $ */
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  modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
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      notice, this list of conditions and the following disclaimer in the
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   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.

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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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/*$FreeBSD: head/sys/dev/ixgbe/if_fdir.c 327031 2017-12-20 18:15:06Z erj $*/

#include "ixgbe.h"

#ifdef IXGBE_FDIR

void
ixgbe_init_fdir(struct adapter *adapter)
{
	u32 hdrm = 32 << fdir_pballoc;

	if (!(adapter->feat_en & IXGBE_FEATURE_FDIR))
		return;

	adapter->hw.mac.ops.setup_rxpba(&adapter->hw, 0, hdrm,
	    PBA_STRATEGY_EQUAL);
	ixgbe_init_fdir_signature_82599(&adapter->hw, fdir_pballoc);
} /* ixgbe_init_fdir */

void
ixgbe_reinit_fdir(void *context)
{
	struct adapter *adapter = context;
	struct ifnet   *ifp = adapter->ifp;

	KASSERT(mutex_owned(&adapter->core_mtx));

	if (!(adapter->feat_en & IXGBE_FEATURE_FDIR))
		return;
	if (adapter->fdir_reinit != 1) /* Shouldn't happen */
		return;
	ixgbe_reinit_fdir_tables_82599(&adapter->hw);
	adapter->fdir_reinit = 0;
	/* re-enable flow director interrupts */
	IXGBE_WRITE_REG(&adapter->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 adapter             *adapter = txr->adapter;
	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 = &adapter->queues[txr->me];
	/*
	 * This assumes the Rx queue and Tx
	 * queue are bound to the same CPU
	 */
	ixgbe_fdir_add_signature_filter_82599(&adapter->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_1PARAMETER(context);
} /* ixgbe_reinit_fdir */

void
ixgbe_atr(struct tx_ring *txr, struct mbuf *mp)
{
	UNREFERENCED_2PARAMETER(txr, mp);
} /* ixgbe_atr */

#endif