If bpf(4) has not been compiled into the kernel, initialize the bpf interface
pointer to a zeroed, statically allocated bpf_if structure. This way the LIST_EMPTY() macro will always return true. This allows us to remove the additional unconditional memory reference for each packet in the fast path. Discussed with: sam
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=159595
@ -1790,6 +1790,7 @@ SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,bpf_drvinit,NULL)
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* A 'better' implementation would allow the core bpf functionality
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* to be loaded at runtime.
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*/
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static struct bpf_if bp_null;
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void
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bpf_tap(bp, pkt, pktlen)
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@ -1820,6 +1821,8 @@ bpfattach(ifp, dlt, hdrlen)
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struct ifnet *ifp;
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u_int dlt, hdrlen;
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{
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bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf);
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}
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void
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@ -1828,6 +1831,8 @@ bpfattach2(ifp, dlt, hdrlen, driverp)
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u_int dlt, hdrlen;
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struct bpf_if **driverp;
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{
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*driverp = &bp_null;
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}
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void
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@ -630,7 +630,7 @@ static __inline int
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bpf_peers_present(struct bpf_if *bpf)
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{
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if (bpf && !LIST_EMPTY(&bpf->bif_dlist))
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if (!LIST_EMPTY(&bpf->bif_dlist))
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return (1);
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return (0);
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}
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