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    tipc: message reassembly using fragment chain · 40ba3cdf
    Erik Hugne 提交于
    When the first fragment of a long data data message is received on a link, a
    reassembly buffer large enough to hold the data from this and all subsequent
    fragments of the message is allocated. The payload of each new fragment is
    copied into this buffer upon arrival. When the last fragment is received, the
    reassembled message is delivered upwards to the port/socket layer.
    
    Not only is this an inefficient approach, but it may also cause bursts of
    reassembly failures in low memory situations. since we may fail to allocate
    the necessary large buffer in the first place. Furthermore, after 100 subsequent
    such failures the link will be reset, something that in reality aggravates the
    situation.
    
    To remedy this problem, this patch introduces a different approach. Instead of
    allocating a big reassembly buffer, we now append the arriving fragments
    to a reassembly chain on the link, and deliver the whole chain up to the
    socket layer once the last fragment has been received. This is safe because
    the retransmission layer of a TIPC link always delivers packets in strict
    uninterrupted order, to the reassembly layer as to all other upper layers.
    Hence there can never be more than one fragment chain pending reassembly at
    any given time in a link, and we can trust (but still verify) that the
    fragments will be chained up in the correct order.
    Signed-off-by: NErik Hugne <erik.hugne@ericsson.com>
    Reviewed-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
    Signed-off-by: NJon Maloy <jon.maloy@ericsson.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    40ba3cdf
node.h 5.3 KB