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Merge pull request #315 from neilalexander/flowlabel
Update switch flow separation for IPv4
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commit
ad6ec6ab11
@ -554,17 +554,30 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
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}
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// code isn't multithreaded so appending to this is safe
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coords := sinfo.coords
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// Read IPv6 flowlabel field (20 bits).
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// Assumes packet at least contains IPv6 header.
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flowkey := uint64(bs[1]&0x0f)<<16 | uint64(bs[2])<<8 | uint64(bs[3])
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// Check if the flowlabel was specified
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if flowkey == 0 {
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// Does the packet meet the minimum UDP packet size? (others are bigger)
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if len(bs) >= 48 {
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// Is the protocol TCP, UDP, SCTP?
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// Work out the flowkey - this is used to determine which switch queue
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// traffic will be pushed to in the event of congestion
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var flowkey uint64
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// Get the IP protocol version from the packet
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switch bs[0] & 0xf0 {
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case 0x40: // IPv4 packet
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// Check the packet meets minimum UDP packet length
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if len(bs) >= 24 {
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// Is the protocol TCP, UDP or SCTP?
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if bs[9] == 0x06 || bs[9] == 0x11 || bs[9] == 0x84 {
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ihl := bs[0] & 0x0f * 4 // Header length
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flowkey = uint64(bs[9])<<32 /* proto */ |
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uint64(bs[ihl+0])<<24 | uint64(bs[ihl+1])<<16 /* sport */ |
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uint64(bs[ihl+2])<<8 | uint64(bs[ihl+3]) /* dport */
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}
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}
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case 0x60: // IPv6 packet
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// Check if the flowlabel was specified in the packet header
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flowkey = uint64(bs[1]&0x0f)<<16 | uint64(bs[2])<<8 | uint64(bs[3])
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// If the flowlabel isn't present, make protokey from proto | sport | dport
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// if the packet meets minimum UDP packet length
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if flowkey == 0 && len(bs) >= 48 {
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// Is the protocol TCP, UDP or SCTP?
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if bs[6] == 0x06 || bs[6] == 0x11 || bs[6] == 0x84 {
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// if flowlabel was unspecified (0), try to use known protocols' ports
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// protokey: proto | sport | dport
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flowkey = uint64(bs[6])<<32 /* proto */ |
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uint64(bs[40])<<24 | uint64(bs[41])<<16 /* sport */ |
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uint64(bs[42])<<8 | uint64(bs[43]) /* dport */
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