Difference between revisions of "Implementing A Very Simple Protocol"
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Very Simple Virtual Circuit Protocol | Very Simple Virtual Circuit Protocol | ||
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| + | Goals | ||
| + | * Describe basic user procedure | ||
| + | * Begin to describe underlying architecture and components | ||
| + | * Talk about substrate concept | ||
Versions | Versions | ||
| Line 6: | Line 11: | ||
** VCI is globally unique | ** VCI is globally unique | ||
* 1 | * 1 | ||
| − | ** VCI can change during transit | + | ** VCI can change during transit as part of pkt processing |
User-space pkt | User-space pkt | ||
| Line 15: | Line 20: | ||
User-Space Implementation | User-Space Implementation | ||
* Filters for local delivery | * Filters for local delivery | ||
| − | * User-space process | + | * User-space process |
| + | ** Has VCI-socket map M | ||
| + | ** Forwards pkt to socket M(pkt.VCI) | ||
Fastpath Implementation | Fastpath Implementation | ||
| + | * Requires mods to Parse and Header Format | ||
| + | * Uses generic Lookup | ||
| + | |||
| + | Interesting Example | ||
Revision as of 03:14, 29 May 2009
Very Simple Virtual Circuit Protocol
Goals
- Describe basic user procedure
- Begin to describe underlying architecture and components
- Talk about substrate concept
Versions
- 0
- VCI in first word of UDP payload
- VCI is globally unique
- 1
- VCI can change during transit as part of pkt processing
User-space pkt
- Tunnel socket appears in UDP header
- VCI is first word of UDP payload
- Payload also has timestamp (for RTT and space-time diagram)
User-Space Implementation
- Filters for local delivery
- User-space process
- Has VCI-socket map M
- Forwards pkt to socket M(pkt.VCI)
Fastpath Implementation
- Requires mods to Parse and Header Format
- Uses generic Lookup
Interesting Example
