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Allow ethernet drivers to pass in packets connected via the nextpkt pointer.

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Handling packets in this way allows drivers to amortize work during packet reception.

Submitted by:	Vijay Singh
Sponsored by:	NetApp
This commit is contained in:
George V. Neville-Neil 2013-11-18 22:58:14 +00:00
parent c4dfa475ca
commit 4857f5fbbc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=258328
1 changed files with 18 additions and 6 deletions
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24
sys/net/if_ethersubr.c
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@ -708,13 +708,25 @@ static void
ether_input(struct ifnet *ifp, struct mbuf *m)
{
/*
* We will rely on rcvif being set properly in the deferred context,
* so assert it is correct here.
*/
KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
struct mbuf *mn;
netisr_dispatch(NETISR_ETHER, m);
/*
* The drivers are allowed to pass in a chain of packets linked with
* m_nextpkt. We split them up into separate packets here and pass
* them up. This allows the drivers to amortize the receive lock.
*/
while (m) {
mn = m->m_nextpkt;
m->m_nextpkt = NULL;
/*
* We will rely on rcvif being set properly in the deferred context,
* so assert it is correct here.
*/
KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
netisr_dispatch(NETISR_ETHER, m);
m = mn;
}
}
/*