Document the interface method if_input().
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@ -84,6 +84,8 @@
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.Fn IF_DEQUEUE "struct ifqueue *ifq" "struct mbuf *m"
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.\"
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.Ss "struct ifnet Member Functions"
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.Ft void
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.Fn \*(lp*if_input\*(rp "struct ifnet *ifp" "struct mbuf *m"
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.Ft int
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.Fo \*(lp*if_output\*(rp
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.Fa "struct ifnet *ifp" "struct mbuf *m"
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@ -329,6 +331,15 @@ There are in addition a number of function pointers which the driver
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must initialize to complete its interface with the generic interface
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layer:
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.Bl -ohang -offset indent
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.It Fn if_input
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Pass a packet to an appropriate upper layer as determined
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from the link-layer header of the packet.
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This routine is to be called from an interrupt handler or
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used to emulate reception of a packet on this interface.
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A single function implementing
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.Fn if_input
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can be shared among multiple drivers utilizing the same link-layer
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framing, e.g., Ethernet.
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.It Fn if_output
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Output a packet on interface
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.Fa ifp ,
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