Add a hook function called on buffer release#1340
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This patch adds a hook function to FreeRTOS-Plus-TCP to notify the network driver whenever a buffer is released. One could use iptraceNETWORK_BUFFER_RELEASED (what I did at first) but this is not what it was designed for. A network driver allocates a buffer to store incoming frames from the network. Once a frame has been received the buffer is passed to FreeRTOS-Plus-TCP which will consume it and then probably release it or not. For a zero-copy network driver using BufferAllocation_1.c it is helpful or even necessary to get a notification once FreeRTOS-Plus-TCP releases a buffer. The notification can be used for memory management, for instance to re-allocate a new buffer to receive further frames.
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Description
This patch adds a hook function to FreeRTOS-Plus-TCP to notify the network driver whenever a buffer is released.
One could use iptraceNETWORK_BUFFER_RELEASED (what I did at first) but this is not what it was designed for.
A network driver allocates a buffer to store incoming frames from the network. Once a frame has been received the buffer is passed to FreeRTOS-Plus-TCP which will consume it and then probably release it or not. For a zero-copy network driver using BufferAllocation_1.c it is helpful or even necessary to get a notification once FreeRTOS-Plus-TCP releases a buffer. The notification can be used for memory management, for instance to re-allocate a new buffer to receive further frames.
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