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Define and use two macros for loopback checksum offload:

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LO_CSUM_FEATURES - a bitmask of supported transmit offload features, which
  will be stored in if_hwassist if IFCAP_TXCSUM is enabled, and be cleared
  from mbuf packet header csum flags on transmit. (1)

LO_CSUM_SET - a bitmask of supported receive offload features, which will
  be set on the mbuf packet header csum flags on transmit if IFCAP_RXCSUM
  is enabled.

While here, fix SCTP offload for loopback: offer generation on the
transmit side, don't just skip validation on the receive side.

Obtained from:  DragonflyBSD (1)
MFC after:      1 week
This commit is contained in:
Robert Watson 2009-03-16 10:56:50 +00:00
parent 6465d2d9d2
commit 5bb89930e4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189873
1 changed files with 9 additions and 6 deletions
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15
sys/net/if_loop.c
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@ -94,6 +94,11 @@
#define LOMTU 16384
#endif
#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
CSUM_IP_CHECKED | CSUM_IP_VALID | \
CSUM_SCTP_VALID)
int loioctl(struct ifnet *, u_long, caddr_t);
static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
int looutput(struct ifnet *ifp, struct mbuf *m,
@ -139,7 +144,7 @@ lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
ifp->if_output = looutput;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
ifp->if_hwassist = CSUM_IP | CSUM_TCP | CSUM_UDP;
ifp->if_hwassist = LO_CSUM_FEATURES;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
if (V_loif == NULL)
@ -216,11 +221,9 @@ looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
case AF_INET:
if (ifp->if_capenable & IFCAP_RXCSUM) {
m->m_pkthdr.csum_data = 0xffff;
m->m_pkthdr.csum_flags = CSUM_DATA_VALID |
CSUM_PSEUDO_HDR | CSUM_IP_CHECKED |
CSUM_IP_VALID | CSUM_SCTP_VALID;
m->m_pkthdr.csum_flags = LO_CSUM_SET;
}
m->m_pkthdr.csum_flags &= ~(CSUM_IP | CSUM_TCP | CSUM_UDP);
m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
case AF_INET6:
case AF_IPX:
case AF_APPLETALK:
@ -407,7 +410,7 @@ loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
if ((mask & IFCAP_TXCSUM) != 0)
ifp->if_capenable ^= IFCAP_TXCSUM;
if (ifp->if_capenable & IFCAP_TXCSUM)
ifp->if_hwassist = CSUM_IP | CSUM_TCP | CSUM_UDP;
ifp->if_hwassist = LO_CSUM_FEATURES;
else
ifp->if_hwassist = 0;
break;