IB/qib: Eliminate divide/mod in converting idx to egr buf pointer
The context init now saves a shift from rcvegrbufs_perchunk rcvegrbufs_perchunk_shift using ilog2. A BUG_ON() protects the power of 2 assumption. Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
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