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Only send packet to bpf if we are committed to send it. Previously it was

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possible that the same packet would show up multiple times.  This poses some
constraints on the TBD locking for snc(4) (see comment).

Obtained from:	DragonFlyBSD
Submitted by:	Joerg Sonnenberger
Reviewed by:	rwatson
This commit is contained in:
Max Laier 2005-02-21 17:30:10 +00:00
parent 93d6cddf05
commit 473156220d
1 changed files with 10 additions and 6 deletions
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16
sys/dev/snc/dp83932.c
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@ -345,12 +345,6 @@ sncstart(ifp)
/* We need the header for m_pkthdr.len. */
M_ASSERTPKTHDR(m);
/*
* If bpf is listening on this interface, let it
* see the packet before we commit it to the wire.
*/
BPF_MTAP(ifp, m);
/*
* If there is nothing in the o/p queue, and there is room in
* the Tx ring, then send the packet directly. Otherwise append
@ -361,6 +355,16 @@ sncstart(ifp)
return;
}
/*
* If bpf is listening on this interface, let it see the packet
* before we commit it to the wire, but only if we are really
* committed to send it.
*
* XXX: Locking must protect m against premature m_freem() in
* sonictxint().
*/
BPF_MTAP(ifp, m);
sc->mtd_prev = sc->mtd_free;
sc->mtd_free = mtd_next;