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104 lines
3.6 KiB
Plaintext
104 lines
3.6 KiB
Plaintext
$FreeBSD$
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Development ideas..
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Archie's suggestions... :-)
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- There should be a new malloc type: M_NETGRAPH
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[DONE]
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- all mallocs/frees now changed to use this.. JRE
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- might further split them out some time.
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- Use MALLOC and FREE macros instead of direct function calls
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[DONE]
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- They allow conditional compilation which keeps
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statistics & counters on various memory allocation
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(or so it seems)
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- Now tend to have NG_FREE_XX() macros. they
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allow better debugging
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- In struct ng_mesg: at least make "header" into "hdr", if not
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getting rid of it altogether. It doesn't seem necessary and
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makes all my C code lines too long.
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- I understand.. one thought however.. consider..
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if char data[0] were not legal, so that data[1] needed to be
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used instead, then the only way to get the size of the header
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would be sizeof(msg.header) as sizeof(msg) would include the dummy
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following bytes. this is a portability issue and I hope
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it will be ported eventually :)
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- Baloney! you can use sizeof(msg) - 1 then.. or just
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make it a macro, then its always portable:
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#ifdef __GNU_C__
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#define NG_MSG_HDR_SIZE (sizeof(struct ng_message))
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#else
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#define NG_MSG_HDR_SIZE (sizeof(struct ng_message) - 1)
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#endif
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- inertia rules :-b
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- Have a user level program to print out and manipulate nodes, etc.
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- [DONE]
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see ngctl, nghook
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- "Netgraph global" flags to turn on tracing, etc.
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- ngctl needs to be rewritten using libnetgraph. Also it needs a
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command to list all existing nodes (in case you don't know the
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name of what you're looking for).
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[DONE]
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- Need a way to get a list of ALL nodes.
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[DONE]
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- see NGM_LISTNODES
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- Enhance "netstat" to display all netgraph nodes -- or at least
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all netgraph socket nodes.
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[DONE]
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- BUG FIX: bind() on a socket should neither require nor allow a
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colon character at the end of the name. Note ngctl allows you
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to do it either way!
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[DONE] (I think)
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- bind on a control socket has been disabled
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it was a bad idea.
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- Need to implement passing meta information through socket nodes
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using sendmsg() and recvmsg().
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- Stuff needing to be added to manual:
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- Awareness of SPL level, use ng_queue*() functions when necessary.
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- Malloc all memory with type M_NETGRAPH. -DONE
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- Write code so it can be an LKM or built into the kernel.. this means
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be careful with things like #ifdef INET.
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- All nodes assume that all data mbufs have the M_PKTHDR flag set!
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The ng_send_data() and related functions should have an
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#ifdef DIAGNOSTIC check to check this assumption for every mbuf.
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-DONE with INVARIANTS. Framework should test this more.
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- More generally, netgraph code should make liberal use of the
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#ifdef DIAGNOSTIC definition.
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-INVARIANTS.
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- Since data and messages are sent functionally, programmers need
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to watch out for infinite feedback loops. Should ng_base.c detect
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this automatically?
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- I've been thinking about this. each node could have a 'colour'
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which is set to the colour of the packet as you pass through.
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hitting a node already of your colour would abort. Each packet
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has another (incremented) colour.
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-new 'item' type can hold a hopcount...
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NEW in 2001
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All piggyback responses have gone away.
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use the node ID in the return address field for quick response delivery.
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Every node has a queue, plus there is a list of nodes that have queued work.
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Extensive use of Mutexes. Getting in shape for SMP.
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Messages and data are deliverd in a new form. An Item now has
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all information needed to queue such a request and deliver it later, so
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it is now the basis of all data transfer since any transfer may need to
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be queued.
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