netxen: cut-through rx changes
NX3031 supports cut-through operation where ingress packets are directly dma'ed into host buffers to reduce latency. This requires larger dma buffers (2kb) and different alignemnt. The buffer posting logic is changed a bit. The free rx buffers are maintained in linked list, since the received reference handles can be out of order. However rx descriptors are still posted sequentially, indexed by producer. Signed-off-by: NDhananjay Phadke <dhananjay@netxen.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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