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The rxe send path currently counts the number of skbs outstanding between the rxe driver and the ethernet driver to prevent too many packets to accumulate waiting to send. This patch makes the local loopback path behave the same way. The loopback path forwards the packets to the receive path which will eventually call kfree_skb on all packets and drop the qp references. This makes the loopback path more useful for software testing. Link: https://lore.kernel.org/r/20240329145513.35381-13-rpearsonhpe@gmail.com Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>