Esempio n. 1
0
/*
 * Similar to rss_m2cpuid, but designed to be used by the IP NETISR
 * on incoming frames.
 *
 * If an existing RSS hash exists and it matches what the configured
 * hashing is, then use it.
 *
 * If there's an existing RSS hash but the desired hash is different,
 * or if there's no useful RSS hash, then calculate it via
 * the software path.
 *
 * XXX TODO: definitely want statistics here!
 */
struct mbuf *
rss_soft_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid)
{
	uint32_t hash_val, hash_type;
	int ret;

	M_ASSERTPKTHDR(m);

	ret = rss_mbuf_software_hash_v4(m, RSS_HASH_PKT_INGRESS,
	    &hash_val, &hash_type);
	if (ret > 0) {
		/* mbuf has a valid hash already; don't need to modify it */
		*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
	} else if (ret == 0) {
		/* hash was done; update */
		m->m_pkthdr.flowid = hash_val;
		M_HASHTYPE_SET(m, hash_type);
		m->m_flags |= M_FLOWID;
		*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
	} else { /* ret < 0 */
		/* no hash was done */
		*cpuid = NETISR_CPUID_NONE;
	}
	return (m);
}
Esempio n. 2
0
static struct inpcbgroup *
in_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
{

	return (in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
	    m->m_pkthdr.flowid));
}
Esempio n. 3
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/*
 * netisr CPU affinity lookup routine for use by protocols.
 */
struct mbuf *
rss_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid)
{

	M_ASSERTPKTHDR(m);
	*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
	return (m);
}
Esempio n. 4
0
int
rss_m2bucket(struct mbuf *m, uint32_t *bucket_id)
{

	M_ASSERTPKTHDR(m);

	return(rss_hash2bucket(m->m_pkthdr.flowid, M_HASHTYPE_GET(m),
	    bucket_id));
}
Esempio n. 5
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static int
nicvf_if_transmit(struct ifnet *ifp, struct mbuf *mbuf)
{
	struct nicvf *nic = if_getsoftc(ifp);
	struct queue_set *qs = nic->qs;
	struct snd_queue *sq;
	struct mbuf *mtmp;
	int qidx;
	int err = 0;


	if (__predict_false(qs == NULL)) {
		panic("%s: missing queue set for %s", __func__,
		    device_get_nameunit(nic->dev));
	}

	/* Select queue */
	if (M_HASHTYPE_GET(mbuf) != M_HASHTYPE_NONE)
		qidx = mbuf->m_pkthdr.flowid % qs->sq_cnt;
	else
		qidx = curcpu % qs->sq_cnt;

	sq = &qs->sq[qidx];

	if (mbuf->m_next != NULL &&
	    (mbuf->m_pkthdr.csum_flags &
	    (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)) != 0) {
		if (M_WRITABLE(mbuf) == 0) {
			mtmp = m_dup(mbuf, M_NOWAIT);
			m_freem(mbuf);
			if (mtmp == NULL)
				return (ENOBUFS);
			mbuf = mtmp;
		}
	}

	err = drbr_enqueue(ifp, sq->br, mbuf);
	if (((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
	    IFF_DRV_RUNNING) || !nic->link_up || (err != 0)) {
		/*
		 * Try to enqueue packet to the ring buffer.
		 * If the driver is not active, link down or enqueue operation
		 * failed, return with the appropriate error code.
		 */
		return (err);
	}

	if (NICVF_TX_TRYLOCK(sq) != 0) {
		err = nicvf_xmit_locked(sq);
		NICVF_TX_UNLOCK(sq);
		return (err);
	} else
		taskqueue_enqueue(sq->snd_taskq, &sq->snd_task);

	return (0);
}
Esempio n. 6
0
/*
 * Do a software calculation of the RSS for the given mbuf.
 *
 * This is typically used by the input path to recalculate the RSS after
 * some form of packet processing (eg de-capsulation, IP fragment reassembly.)
 *
 * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and
 * RSS_HASH_PKT_EGRESS for outgoing.
 *
 * Returns 0 if a hash was done, -1 if no hash was done, +1 if
 * the mbuf already had a valid RSS flowid.
 *
 * This function doesn't modify the mbuf.  It's up to the caller to
 * assign flowid/flowtype as appropriate.
 */
int
rss_mbuf_software_hash_v4(const struct mbuf *m, int dir, uint32_t *hashval,
    uint32_t *hashtype)
{
	const struct ip *ip;
	const struct tcphdr *th;
	const struct udphdr *uh;
	uint32_t flowid;
	uint32_t flowtype;
	uint8_t proto;
	int iphlen;
	int is_frag = 0;

	/*
	 * XXX For now this only handles hashing on incoming mbufs.
	 */
	if (dir != RSS_HASH_PKT_INGRESS) {
		RSS_DEBUG("called on EGRESS packet!\n");
		return (-1);
	}

	/*
	 * First, validate that the mbuf we have is long enough
	 * to have an IPv4 header in it.
	 */
	if (m->m_pkthdr.len < (sizeof(struct ip))) {
		RSS_DEBUG("short mbuf pkthdr\n");
		return (-1);
	}
	if (m->m_len < (sizeof(struct ip))) {
		RSS_DEBUG("short mbuf len\n");
		return (-1);
	}

	/* Ok, let's dereference that */
	ip = mtod(m, struct ip *);
	proto = ip->ip_p;
	iphlen = ip->ip_hl << 2;

	/*
	 * If this is a fragment then it shouldn't be four-tuple
	 * hashed just yet.  Once it's reassembled into a full
	 * frame it should be re-hashed.
	 */
	if (ip->ip_off & htons(IP_MF | IP_OFFMASK))
		is_frag = 1;

	/*
	 * If the mbuf flowid/flowtype matches the packet type,
	 * and we don't support the 4-tuple version of the given protocol,
	 * then signal to the owner that it can trust the flowid/flowtype
	 * details.
	 *
	 * This is a little picky - eg, if TCPv4 / UDPv4 hashing
	 * is supported but we got a TCP/UDP frame only 2-tuple hashed,
	 * then we shouldn't just "trust" the 2-tuple hash.  We need
	 * a 4-tuple hash.
	 */
	flowid = m->m_pkthdr.flowid;
	flowtype = M_HASHTYPE_GET(m);

	if (flowtype != M_HASHTYPE_NONE) {
		switch (proto) {
		case IPPROTO_UDP:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) &&
			    (flowtype == M_HASHTYPE_RSS_UDP_IPV4) &&
			    (is_frag == 0)) {
				return (1);
			}
			/*
			 * Only allow 2-tuple for UDP frames if we don't also
			 * support 4-tuple for UDP.
			 */
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) &&
			    ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) == 0) &&
			    flowtype == M_HASHTYPE_RSS_IPV4) {
				return (1);
			}
			break;
		case IPPROTO_TCP:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) &&
			    (flowtype == M_HASHTYPE_RSS_TCP_IPV4) &&
			    (is_frag == 0)) {
				return (1);
			}
			/*
			 * Only allow 2-tuple for TCP frames if we don't also
			 * support 2-tuple for TCP.
			 */
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) &&
			    ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) == 0) &&
			    flowtype == M_HASHTYPE_RSS_IPV4) {
				return (1);
			}
			break;
		default:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) &&
			    flowtype == M_HASHTYPE_RSS_IPV4) {
				return (1);
			}
			break;
		}
	}

	/*
	 * Decode enough information to make a hash decision.
	 *
	 * XXX TODO: does the hardware hash on 4-tuple if IP
	 *    options are present?
	 */
	if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) &&
	    (proto == IPPROTO_TCP) &&
	    (is_frag == 0)) {
		if (m->m_len < iphlen + sizeof(struct tcphdr)) {
			RSS_DEBUG("short TCP frame?\n");
			return (-1);
		}
		th = (const struct tcphdr *)((c_caddr_t)ip + iphlen);
		return rss_proto_software_hash_v4(ip->ip_src, ip->ip_dst,
		    th->th_sport,
		    th->th_dport,
		    proto,
		    hashval,
		    hashtype);
	} else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) &&
	    (proto == IPPROTO_UDP) &&
	    (is_frag == 0)) {
		uh = (const struct udphdr *)((c_caddr_t)ip + iphlen);
		if (m->m_len < iphlen + sizeof(struct udphdr)) {
			RSS_DEBUG("short UDP frame?\n");
			return (-1);
		}
		return rss_proto_software_hash_v4(ip->ip_src, ip->ip_dst,
		    uh->uh_sport,
		    uh->uh_dport,
		    proto,
		    hashval,
		    hashtype);
	} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) {
		/* Default to 2-tuple hash */
		return rss_proto_software_hash_v4(ip->ip_src, ip->ip_dst,
		    0,	/* source port */
		    0,	/* destination port */
		    0,	/* IPPROTO_IP */
		    hashval,
		    hashtype);
	} else {
		RSS_DEBUG("no available hashtypes!\n");
		return (-1);
	}
}
Esempio n. 7
0
/*
 * Do a software calculation of the RSS for the given mbuf.
 *
 * This is typically used by the input path to recalculate the RSS after
 * some form of packet processing (eg de-capsulation, IP fragment reassembly.)
 *
 * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and
 * RSS_HASH_PKT_EGRESS for outgoing.
 *
 * Returns 0 if a hash was done, -1 if no hash was done, +1 if
 * the mbuf already had a valid RSS flowid.
 *
 * This function doesn't modify the mbuf.  It's up to the caller to
 * assign flowid/flowtype as appropriate.
 */
int
rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval,
    uint32_t *hashtype)
{
	const struct ip6_hdr *ip6;
	const struct tcphdr *th;
	const struct udphdr *uh;
	uint32_t flowtype;
	uint8_t proto;
	int off, newoff;
	int nxt;

	/*
	 * XXX For now this only handles hashing on incoming mbufs.
	 */
	if (dir != RSS_HASH_PKT_INGRESS) {
		RSS_DEBUG("called on EGRESS packet!\n");
		return (-1);
	}

	off = sizeof(struct ip6_hdr);

	/*
	 * First, validate that the mbuf we have is long enough
	 * to have an IPv6 header in it.
	 */
	if (m->m_pkthdr.len < off) {
		RSS_DEBUG("short mbuf pkthdr\n");
		return (-1);
	}
	if (m->m_len < off) {
		RSS_DEBUG("short mbuf len\n");
		return (-1);
	}

	/* Ok, let's dereference that */
	ip6 = mtod(m, struct ip6_hdr *);
	proto = ip6->ip6_nxt;

	/*
	 * Find the beginning of the TCP/UDP header.
	 *
	 * If this is a fragment then it shouldn't be four-tuple
	 * hashed just yet.  Once it's reassembled into a full
	 * frame it should be re-hashed.
	 */
	while (proto != IPPROTO_FRAGMENT) {
		newoff = ip6_nexthdr(m, off, proto, &nxt);
		if (newoff < 0)
			break;
		off = newoff;
		proto = nxt;
	}

	/*
	 * If the mbuf flowid/flowtype matches the packet type,
	 * and we don't support the 4-tuple version of the given protocol,
	 * then signal to the owner that it can trust the flowid/flowtype
	 * details.
	 *
	 * This is a little picky - eg, if TCPv6 / UDPv6 hashing
	 * is supported but we got a TCP/UDP frame only 2-tuple hashed,
	 * then we shouldn't just "trust" the 2-tuple hash.  We need
	 * a 4-tuple hash.
	 */
	flowtype = M_HASHTYPE_GET(m);

	if (flowtype != M_HASHTYPE_NONE) {
		switch (proto) {
		case IPPROTO_UDP:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
			    (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) {
				return (1);
			}
			/*
			 * Only allow 2-tuple for UDP frames if we don't also
			 * support 4-tuple for UDP.
			 */
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
			    ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) &&
			    flowtype == M_HASHTYPE_RSS_IPV6) {
				return (1);
			}
			break;
		case IPPROTO_TCP:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
			    (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) {
				return (1);
			}
			/*
			 * Only allow 2-tuple for TCP frames if we don't also
			 * support 4-tuple for TCP.
			 */
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
			    ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) &&
			    flowtype == M_HASHTYPE_RSS_IPV6) {
				return (1);
			}
			break;
		default:
			if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
			    flowtype == M_HASHTYPE_RSS_IPV6) {
				return (1);
			}
			break;
		}
	}

	/*
	 * Decode enough information to make a hash decision.
	 */
	if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
	    (proto == IPPROTO_TCP)) {
		if (m->m_len < off + sizeof(struct tcphdr)) {
			RSS_DEBUG("short TCP frame?\n");
			return (-1);
		}
		th = (const struct tcphdr *)((c_caddr_t)ip6 + off);
		return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
		    th->th_sport,
		    th->th_dport,
		    proto,
		    hashval,
		    hashtype);
	} else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
	    (proto == IPPROTO_UDP)) {
		if (m->m_len < off + sizeof(struct udphdr)) {
			RSS_DEBUG("short UDP frame?\n");
			return (-1);
		}
		uh = (const struct udphdr *)((c_caddr_t)ip6 + off);
		return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
		    uh->uh_sport,
		    uh->uh_dport,
		    proto,
		    hashval,
		    hashtype);
	} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
		/* Default to 2-tuple hash */
		return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
		    0,	/* source port */
		    0,	/* destination port */
		    0,	/* IPPROTO_IP */
		    hashval,
		    hashtype);
	} else {
		RSS_DEBUG("no available hashtypes!\n");
		return (-1);
	}
}