Author: sephe
Date: Tue Oct 10 08:32:03 2017
New Revision: 324489
URL: https://svnweb.freebsd.org/changeset/base/324489
Log:
hyperv/hn: Workaround erroneous hash type observed on WS2016.
Background:
- UDP 4-tuple hash type is unconditionally enabled in Hyper-V on WS2016,
which is _not_ affected by NDIS_OBJTYPE_RSS_PARAMS.
- Non-fragment UDP/IPv4 datagrams' hash type is delivered to VM as
TCP_IPV4.
Currently this erroneous behavior only applies to WS2016/Windows10.
Force l3/l4 protocol check, if the RXed packet's hash type is TCP_IPV4,
and the Hyper-V is running on WS2016/Windows10. If the RXed packet is
UDP datagram, adjust mbuf hash type to UDP_IPV4.
MFC after: 3 days
Sponsored by: Microsoft
Modified:
head/sys/dev/hyperv/netvsc/hn_nvs.c
head/sys/dev/hyperv/netvsc/if_hn.c
head/sys/dev/hyperv/netvsc/if_hnvar.h
Modified: head/sys/dev/hyperv/netvsc/hn_nvs.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hn_nvs.c Tue Oct 10 08:23:19 2017
(r324488)
+++ head/sys/dev/hyperv/netvsc/hn_nvs.c Tue Oct 10 08:32:03 2017
(r324489)
@@ -601,6 +601,11 @@ hn_nvs_attach(struct hn_softc *sc, int mtu)
{
int error;
+ if (hyperv_ver_major >= 10) {
+ /* UDP 4-tuple hash is enforced. */
+ sc->hn_caps |= HN_CAP_UDPHASH;
+ }
+
/*
* Initialize NVS.
*/
Modified: head/sys/dev/hyperv/netvsc/if_hn.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/if_hn.c Tue Oct 10 08:23:19 2017
(r324488)
+++ head/sys/dev/hyperv/netvsc/if_hn.c Tue Oct 10 08:32:03 2017
(r324489)
@@ -385,6 +385,7 @@ static void hn_link_status(struct hn_softc
*);
static int hn_create_rx_data(struct hn_softc *, int);
static void hn_destroy_rx_data(struct hn_softc *);
static int hn_check_iplen(const struct mbuf *, int);
+static void hn_rxpkt_proto(const struct mbuf *, int *, int
*);
static int hn_set_rxfilter(struct hn_softc *, uint32_t);
static int hn_rxfilter_config(struct hn_softc *);
static int hn_rss_reconfig(struct hn_softc *);
@@ -399,6 +400,7 @@ static int hn_tx_ring_create(struct
hn_softc *, int)
static void hn_tx_ring_destroy(struct hn_tx_ring *);
static int hn_create_tx_data(struct hn_softc *, int);
static void hn_fixup_tx_data(struct hn_softc *);
+static void hn_fixup_rx_data(struct hn_softc *);
static void hn_destroy_tx_data(struct hn_softc *);
static void hn_txdesc_dmamap_destroy(struct hn_txdesc *);
static void hn_txdesc_gc(struct hn_tx_ring *,
@@ -2238,9 +2240,10 @@ hn_attach(device_t dev)
#endif
/*
- * Fixup TX stuffs after synthetic parts are attached.
+ * Fixup TX/RX stuffs after synthetic parts are attached.
*/
hn_fixup_tx_data(sc);
+ hn_fixup_rx_data(sc);
ctx = device_get_sysctl_ctx(dev);
child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
@@ -3378,6 +3381,7 @@ hn_rxpkt(struct hn_rx_ring *rxr, const void *data, int
struct mbuf *m_new;
int size, do_lro = 0, do_csum = 1, is_vf = 0;
int hash_type = M_HASHTYPE_NONE;
+ int l3proto = ETHERTYPE_MAX, l4proto = IPPROTO_DONE;
ifp = hn_ifp;
if (rxr->hn_rxvf_ifp != NULL) {
@@ -3477,31 +3481,9 @@ hn_rxpkt(struct hn_rx_ring *rxr, const void *data, int
(NDIS_RXCSUM_INFO_TCPCS_OK | NDIS_RXCSUM_INFO_IPCS_OK))
do_lro = 1;
} else {
- const struct ether_header *eh;
- uint16_t etype;
- int hoff;
-
- hoff = sizeof(*eh);
- /* Checked at the beginning of this function. */
- KASSERT(m_new->m_len >= hoff, ("not ethernet frame"));
-
- eh = mtod(m_new, struct ether_header *);
- etype = ntohs(eh->ether_type);
- if (etype == ETHERTYPE_VLAN) {
- const struct ether_vlan_header *evl;
-
- hoff = sizeof(*evl);
- if (m_new->m_len < hoff)
- goto skip;
- evl = mtod(m_new, struct ether_vlan_header *);
- etype = ntohs(evl->evl_proto);
- }
-
- if (etype == ETHERTYPE_IP) {
- int pr;
-
- pr = hn_check_iplen(m_new, hoff);
- if (pr == IPPROTO_TCP) {
+ hn_rxpkt_proto(m_new, &l3proto, &l4proto);
+ if (l3proto == ETHERTYPE_IP) {
+ if (l4proto == IPPROTO_TCP) {
if (do_csum &&
(rxr->hn_trust_hcsum &
HN_TRUST_HCSUM_TCP)) {
@@ -3512,7 +3494,7 @@ hn_rxpkt(struct hn_rx_ring *rxr, const void *data, int
m_new->m_pkthdr.csum_data = 0xffff;
}
do_lro = 1;
- } else if (pr == IPPROTO_UDP) {
+ } else if (l4proto == IPPROTO_UDP) {
if (do_csum &&
(rxr->hn_trust_hcsum &
HN_TRUST_HCSUM_UDP)) {
@@ -3522,7 +3504,7 @@ hn_rxpkt(struct hn_rx_ring *rxr, const void *data, int
CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
m_new->m_pkthdr.csum_data = 0xffff;
}
- } else if (pr != IPPROTO_DONE && do_csum &&
+ } else if (l4proto != IPPROTO_DONE && do_csum &&
(rxr->hn_trust_hcsum & HN_TRUST_HCSUM_IP)) {
rxr->hn_csum_trusted++;
m_new->m_pkthdr.csum_flags |=
@@ -3530,7 +3512,7 @@ hn_rxpkt(struct hn_rx_ring *rxr, const void *data, int
}
}
}
-skip:
+
if (info->vlan_info != HN_NDIS_VLAN_INFO_INVALID) {
m_new->m_pkthdr.ether_vtag = EVL_MAKETAG(
NDIS_VLAN_INFO_ID(info->vlan_info),
@@ -3585,6 +3567,35 @@ skip:
case NDIS_HASH_TCP_IPV4:
hash_type = M_HASHTYPE_RSS_TCP_IPV4;
+ if (rxr->hn_rx_flags & HN_RX_FLAG_UDP_HASH) {
+ int def_htype = M_HASHTYPE_OPAQUE_HASH;
+
+ if (is_vf)
+ def_htype = M_HASHTYPE_NONE;
+
+ /*
+ * UDP 4-tuple hash is delivered as
+ * TCP 4-tuple hash.
+ */
+ if (l3proto == ETHERTYPE_MAX) {
+ hn_rxpkt_proto(m_new,
+ &l3proto, &l4proto);
+ }
+ if (l3proto == ETHERTYPE_IP) {
+ if (l4proto == IPPROTO_UDP) {
+ hash_type =
+ M_HASHTYPE_RSS_UDP_IPV4;
+ do_lro = 0;
+ } else if (l4proto !=
+ IPPROTO_TCP) {
+ hash_type = def_htype;
+ do_lro = 0;
+ }
+ } else {
+ hash_type = def_htype;
+ do_lro = 0;
+ }
+ }
break;
case NDIS_HASH_IPV6:
@@ -4835,6 +4846,36 @@ hn_check_iplen(const struct mbuf *m, int hoff)
return ip->ip_p;
}
+static void
+hn_rxpkt_proto(const struct mbuf *m_new, int *l3proto, int *l4proto)
+{
+ const struct ether_header *eh;
+ uint16_t etype;
+ int hoff;
+
+ hoff = sizeof(*eh);
+ /* Checked at the beginning of this function. */
+ KASSERT(m_new->m_len >= hoff, ("not ethernet frame"));
+
+ eh = mtod(m_new, const struct ether_header *);
+ etype = ntohs(eh->ether_type);
+ if (etype == ETHERTYPE_VLAN) {
+ const struct ether_vlan_header *evl;
+
+ hoff = sizeof(*evl);
+ if (m_new->m_len < hoff)
+ return;
+ evl = mtod(m_new, const struct ether_vlan_header *);
+ etype = ntohs(evl->evl_proto);
+ }
+ *l3proto = etype;
+
+ if (etype == ETHERTYPE_IP)
+ *l4proto = hn_check_iplen(m_new, hoff);
+ else
+ *l4proto = IPPROTO_DONE;
+}
+
static int
hn_create_rx_data(struct hn_softc *sc, int ring_cnt)
{
@@ -5543,6 +5584,18 @@ hn_fixup_tx_data(struct hn_softc *sc)
if_printf(sc->hn_ifp, "support HASHVAL pktinfo\n");
for (i = 0; i < sc->hn_tx_ring_cnt; ++i)
sc->hn_tx_ring[i].hn_tx_flags |= HN_TX_FLAG_HASHVAL;
+ }
+}
+
+static void
+hn_fixup_rx_data(struct hn_softc *sc)
+{
+
+ if (sc->hn_caps & HN_CAP_UDPHASH) {
+ int i;
+
+ for (i = 0; i < sc->hn_rx_ring_cnt; ++i)
+ sc->hn_rx_ring[i].hn_rx_flags |= HN_RX_FLAG_UDP_HASH;
}
}
Modified: head/sys/dev/hyperv/netvsc/if_hnvar.h
==============================================================================
--- head/sys/dev/hyperv/netvsc/if_hnvar.h Tue Oct 10 08:23:19 2017
(r324488)
+++ head/sys/dev/hyperv/netvsc/if_hnvar.h Tue Oct 10 08:32:03 2017
(r324489)
@@ -97,6 +97,7 @@ struct hn_rx_ring {
#define HN_RX_FLAG_ATTACHED 0x0001
#define HN_RX_FLAG_BR_REF 0x0002
#define HN_RX_FLAG_XPNT_VF 0x0004
+#define HN_RX_FLAG_UDP_HASH 0x0008
struct hn_tx_ring {
#ifndef HN_USE_TXDESC_BUFRING
@@ -304,11 +305,12 @@ do { \
#define HN_CAP_TSO4 0x0080
#define HN_CAP_TSO6 0x0100
#define HN_CAP_HASHVAL 0x0200
+#define HN_CAP_UDPHASH 0x0400
/* Capability description for use with printf(9) %b identifier. */
#define HN_CAP_BITS \
"\020\1VLAN\2MTU\3IPCS\4TCP4CS\5TCP6CS" \
- "\6UDP4CS\7UDP6CS\10TSO4\11TSO6\12HASHVAL"
+ "\6UDP4CS\7UDP6CS\10TSO4\11TSO6\12HASHVAL\13UDPHASH"
#define HN_LINK_FLAG_LINKUP 0x0001
#define HN_LINK_FLAG_NETCHG 0x0002
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