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Currently, we stop tx queues when we have one urb submitted. This means we will immediately hit dev_hard_start_xmit's tx-queues-off -> NETDEV_TX_BUSY case, and revert to the requeue -> gso_skb single-dequeue path, and no longer be able to pack skbs without an xmit_more indication. Instead, allow a few urbs to be in-flight, with a limit of 16kB of data outstanding (after which we will disable queues). With this, the tx path will cause fewer requeues (and therefore non-packed transfers) under normal loads. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Link: https://patch.msgid.link/20260724-dev-mctp-usb-1-1-v5-12-e66bbba0dbdc@codeconstruct.com.au Signed-off-by: Jakub Kicinski <kuba@kernel.org>