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netstack: don't allocate in XDP hot paths

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In a redis-benchmark PING_INLINE test, this reduces allocations by 84%.

PiperOrigin-RevId: 617542009
This commit is contained in:
Kevin Krakauer
2024-03-20 09:45:47 -07:00
committed by gVisor bot
parent 8f1f1339bf
commit 1f6bd75648
1 changed files with 8 additions and 4 deletions
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pkg/tcpip/link/xdp/endpoint.go
+8 -4
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@@ -301,8 +301,14 @@ func (ep *endpoint) WritePackets(pkts stack.PacketBufferList) (int, tcpip.Error)
// Copy packets into UMEM frame.
frame := ep.control.UMEM.Get(batch[i])
offset := 0
for _, buf := range pkt.AsSlices() {
offset += copy(frame[offset:], buf)
var view *buffer.View
views, pktOffset := pkt.AsViewList()
for view = views.Front(); view != nil && pktOffset >= view.Size(); view = view.Next() {
pktOffset -= view.Size()
}
offset += copy(frame[offset:], view.AsSlice()[pktOffset:])
for view = view.Next(); view != nil; view = view.Next() {
offset += copy(frame[offset:], view.AsSlice())
}
ep.control.TX.Set(index+uint32(i), batch[i])
}
@@ -385,7 +391,5 @@ func (ep *endpoint) dispatch() (bool, tcpip.Error) {
// descriptors in the RX queue.
ep.control.RX.Release(nReceived)
}
return true, nil
}
}