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Avoid calling CURVNET_[SET|RESTORE] for each packet

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The LRO possible test was calling CURVNET_SET once for IPv4 or IPv6 for
each packet in a chain. Only call it once per chain instead.

Submitted by:	Matthew Macy <mmacy@mattmacy.io>
Reviewed by:	cem, ae
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D13368
This commit is contained in:
shurd 2017-12-05 20:43:24 +00:00
parent 53dcd76891
commit f54cf2fa3b
1 changed files with 25 additions and 20 deletions
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45
sys/net/iflib.c
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@ -2467,13 +2467,26 @@ iflib_rxd_pkt_get(iflib_rxq_t rxq, if_rxd_info_t ri)
}
#if defined(INET6) || defined(INET)
static void
iflib_get_ip_forwarding(struct lro_ctrl *lc, bool *v4, bool *v6)
{
CURVNET_SET(lc->ifp->if_vnet);
#if defined(INET6)
*v6 = VNET(ip6_forwarding);
#endif
#if defined(INET)
*v4 = VNET(ipforwarding);
#endif
CURVNET_RESTORE();
}
/*
* Returns true if it's possible this packet could be LROed.
* if it returns false, it is guaranteed that tcp_lro_rx()
* would not return zero.
*/
static bool
iflib_check_lro_possible(struct lro_ctrl *lc, struct mbuf *m)
iflib_check_lro_possible(struct mbuf *m, bool v4_forwarding, bool v6_forwarding)
{
struct ether_header *eh;
uint16_t eh_type;
@ -2483,32 +2496,21 @@ iflib_check_lro_possible(struct lro_ctrl *lc, struct mbuf *m)
switch (eh_type) {
#if defined(INET6)
case ETHERTYPE_IPV6:
{
CURVNET_SET(lc->ifp->if_vnet);
if (VNET(ip6_forwarding) == 0) {
CURVNET_RESTORE();
return true;
}
CURVNET_RESTORE();
break;
}
return !v6_forwarding;
#endif
#if defined (INET)
case ETHERTYPE_IP:
{
CURVNET_SET(lc->ifp->if_vnet);
if (VNET(ipforwarding) == 0) {
CURVNET_RESTORE();
return true;
}
CURVNET_RESTORE();
break;
}
return !v4_forwarding;
#endif
}
return false;
}
#else
static void
iflib_get_ip_forwarding(struct lro_ctrl *lc __unused, bool *v4 __unused, bool *v6 __unused)
{
}
#endif
static bool
@ -2525,6 +2527,7 @@ iflib_rxeof(iflib_rxq_t rxq, qidx_t budget)
struct ifnet *ifp;
int lro_enabled;
bool lro_possible = false;
bool v4_forwarding, v6_forwarding;
/*
* XXX early demux data packets so that if_input processing only handles
@ -2601,6 +2604,8 @@ iflib_rxeof(iflib_rxq_t rxq, qidx_t budget)
__iflib_fl_refill_lt(ctx, fl, budget + 8);
lro_enabled = (if_getcapenable(ifp) & IFCAP_LRO);
if (lro_enabled)
iflib_get_ip_forwarding(&rxq->ifr_lc, &v4_forwarding, &v6_forwarding);
mt = mf = NULL;
while (mh != NULL) {
m = mh;
@ -2615,7 +2620,7 @@ iflib_rxeof(iflib_rxq_t rxq, qidx_t budget)
#if defined(INET6) || defined(INET)
if (lro_enabled) {
if (!lro_possible) {
lro_possible = iflib_check_lro_possible(&rxq->ifr_lc, m);
lro_possible = iflib_check_lro_possible(m, v4_forwarding, v6_forwarding);
if (lro_possible && mf != NULL) {
ifp->if_input(ifp, mf);
DBG_COUNTER_INC(rx_if_input);