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Author: theop-dd

pkg/security/ebpf/probes/rawpacket/pcap.go

@@ -113,37 +113,35 @@ func dropStatsIncrementInsts(filterIndex int, dropStatsMapFd int, nextLabel stri
 	initLabel := fmt.Sprintf("init_drop_stat_%d", filterIndex)
 
 	return asm.Instructions{
+		// Put the key on the stack
 		asm.Mov.Reg(asm.R1, asm.RFP).WithSymbol(incLabel),
 		asm.Add.Imm(asm.R1, int32(dropStatsKeyStackOffset)),
 		asm.Mov.Imm(asm.R2, int32(filterIndex)),
 		asm.StoreMem(asm.R1, 0, asm.R2, asm.DWord),
-
+		// Lookup in the map
 		asm.LoadMapPtr(asm.R1, dropStatsMapFd),
 		asm.Mov.Reg(asm.R2, asm.RFP),
 		asm.Add.Imm(asm.R2, int32(dropStatsKeyStackOffset)),
 		asm.FnMapLookupElem.Call(),
 		asm.JEq.Imm(asm.R0, 0, initLabel),
-
+		// Increment if it exists
 		asm.Mov.Reg(asm.R5, asm.R0),
 		asm.LoadMem(asm.R6, asm.R5, 0, asm.DWord),
 		asm.Add.Imm(asm.R6, 1),
 		asm.StoreMem(asm.R5, 0, asm.R6, asm.DWord),
-
 		asm.Ja.Label(nextLabel),
-
+		// Otherwise create the key and insert it
 		asm.Mov.Reg(asm.R3, asm.RFP).WithSymbol(initLabel),
 		asm.Add.Imm(asm.R3, int32(dropStatsValStackOffset)),
 		asm.Mov.Imm(asm.R4, 1),
 		asm.StoreMem(asm.R3, 0, asm.R4, asm.DWord),
-
 		asm.LoadMapPtr(asm.R1, dropStatsMapFd),
 		asm.Mov.Reg(asm.R2, asm.RFP),
 		asm.Add.Imm(asm.R2, int32(dropStatsKeyStackOffset)),
 		asm.Mov.Reg(asm.R3, asm.RFP),
 		asm.Add.Imm(asm.R3, int32(dropStatsValStackOffset)),
 		asm.Mov.Imm(asm.R4, 0),
 		asm.FnMapUpdateElem.Call(),
-
 		asm.Ja.Label(nextLabel),
 	}
 }