nvme: code command_id with a genctr for use-after-free validation

nvme: code command_id with a genctr for use-after-free validation

We cannot detect a (perhaps buggy) controller that is sending us
a completion for a request that was already completed (for example
sending a completion twice), this phenomenon was seen in the wild
a few times.

So to protect against this, we use the upper 4 msbits of the nvme sqe
command_id to use as a 4-bit generation counter and verify it matches
the existing request generation that is incrementing on every execution.

The 16-bit command_id structure now is constructed by:
| xxxx | xxxxxxxxxxxx |
  gen    request tag

This means that we are giving up some possible queue depth as 12 bits
allow for a maximum queue depth of 4095 instead of 65536, however we
never create such long queues anyways so no real harm done.

Suggested-by: Keith Busch <[email protected]>
Signed-off-by: Sagi Grimberg <[email protected]>
Acked-by: Keith Busch <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Daniel Wagner <[email protected]>
Tested-by: Daniel Wagner <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>