Use a different fanoutID for each new fdbased endpoint.
PiperOrigin-RevId: 274638272
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@ -178,6 +178,14 @@ type Options struct {
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RXChecksumOffload bool
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}
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// fanoutID is used for AF_PACKET based endpoints to enable PACKET_FANOUT
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// support in the host kernel. This allows us to use multiple FD's to receive
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// from the same underlying NIC. The fanoutID needs to be the same for a given
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// set of FD's that point to the same NIC. Trying to set the PACKET_FANOUT
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// option for an FD with a fanoutID already in use by another FD for a different
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// NIC will return an EINVAL.
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var fanoutID = 1
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// New creates a new fd-based endpoint.
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//
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// Makes fd non-blocking, but does not take ownership of fd, which must remain
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@ -245,6 +253,10 @@ func New(opts *Options) (stack.LinkEndpoint, error) {
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e.inboundDispatchers = append(e.inboundDispatchers, inboundDispatcher)
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}
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// Increment fanoutID to ensure that we don't re-use the same fanoutID for
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// the next endpoint.
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fanoutID++
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return e, nil
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}
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@ -265,7 +277,6 @@ func createInboundDispatcher(e *endpoint, fd int, isSocket bool) (linkDispatcher
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case *unix.SockaddrLinklayer:
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// enable PACKET_FANOUT mode is the underlying socket is
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// of type AF_PACKET.
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const fanoutID = 1
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const fanoutType = 0x8000 // PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_DEFRAG
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fanoutArg := fanoutID | fanoutType<<16
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if err := syscall.SetsockoptInt(fd, syscall.SOL_PACKET, unix.PACKET_FANOUT, fanoutArg); err != nil {
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