Remaining Problems:
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Remaining Problems:
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1. Serialization of access to variables in the llc structure
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1. Serialization of access to variables in the llc structure
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by mac_data_indicate(), timer expired functions, and data_request() .
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by mac_data_indicate(), timer expired functions, and data_request() .
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There is not serialization of any kind right now.
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There is not serialization of any kind right now.
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While testing, I have not seen any problems that stem from this lack of
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While testing, I have not seen any problems that stem from this lack of
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serialization, but it wories me...
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serialization, but it wories me...
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2. The code is currently able to handle one connection only,
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2. The code is currently able to handle one connection only,
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there is more work in register_cl2llc_client() to make a chain
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there is more work in register_cl2llc_client() to make a chain
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of llc structures and in mac_data_indicate() to find back
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of llc structures and in mac_data_indicate() to find back
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the llc structure addressed by an incoming frame.
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the llc structure addressed by an incoming frame.
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According to IEEE, connections are identified by (remote mac + local mac
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According to IEEE, connections are identified by (remote mac + local mac
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+ dsap + ssap). dsap and ssap do not seem important: existing applications
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+ dsap + ssap). dsap and ssap do not seem important: existing applications
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always use the same dsap/ssap. Its probably sufficient to index on
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always use the same dsap/ssap. Its probably sufficient to index on
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the remote mac only.
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the remote mac only.
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3. There is no test to see if the transmit window is full in data_request()
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3. There is no test to see if the transmit window is full in data_request()
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as described in the doc p73, "7.5.1 Sending I PDUs" 3th alinea.
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as described in the doc p73, "7.5.1 Sending I PDUs" 3th alinea.
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The pdus presented to data_request() could probably go on the
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The pdus presented to data_request() could probably go on the
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awaiting-transmit-queue (atq). The real difficulty is coding a test
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awaiting-transmit-queue (atq). The real difficulty is coding a test
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to see if the transmit window is used up and to send the queue
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to see if the transmit window is used up and to send the queue
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when space in the window becomes available.
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when space in the window becomes available.
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As I have no network layer that can generate a continous flow of pdus it is
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As I have no network layer that can generate a continous flow of pdus it is
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difficult to simulate a remote busy condition and hence to test the code
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difficult to simulate a remote busy condition and hence to test the code
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to handle it.
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to handle it.
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4. A simple flow control algorithm, steering the size of the transmit
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4. A simple flow control algorithm, steering the size of the transmit
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window would be nice to have.
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window would be nice to have.
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