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IB/qib: Eliminate divide/mod in converting idx to egr buf pointer

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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>
This commit is contained in:
Mike Marciniszyn
2011-09-23 13:16:39 -04:00
committed by Roland Dreier
parent cc6ea1385b
commit 9e1c0e4325
6 changed files with 18 additions and 5 deletions
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6
drivers/infiniband/hw/qib/qib_driver.c
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@@ -279,10 +279,10 @@ bail:
*/
static inline void *qib_get_egrbuf(const struct qib_ctxtdata *rcd, u32 etail)
{
const u32 chunk = etail / rcd->rcvegrbufs_perchunk;
const u32 idx = etail % rcd->rcvegrbufs_perchunk;
const u32 chunk = etail >> rcd->rcvegrbufs_perchunk_shift;
const u32 idx = etail & ((u32)rcd->rcvegrbufs_perchunk - 1);
return rcd->rcvegrbuf[chunk] + idx * rcd->dd->rcvegrbufsize;
return rcd->rcvegrbuf[chunk] + (idx << rcd->dd->rcvegrbufsize_shift);
}
/*