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| author | Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-09-23 13:16:39 -0400 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-10-21 09:38:52 -0700 |
| commit | 9e1c0e43257b6df1ef012dd37c3f0f93b1ee47af (patch) | |
| tree | be40833860d385491b1ac8fa13dffe414954ee76 /drivers/infiniband/hw/qib/qib_driver.c | |
| parent | cc6ea1385b43487f6ef03bdc91416c8366d28311 (diff) | |
| download | op-kernel-dev-9e1c0e43257b6df1ef012dd37c3f0f93b1ee47af.zip op-kernel-dev-9e1c0e43257b6df1ef012dd37c3f0f93b1ee47af.tar.gz | |
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>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_driver.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_driver.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c index 23e584f..89264ff 100644 --- a/drivers/infiniband/hw/qib/qib_driver.c +++ b/drivers/infiniband/hw/qib/qib_driver.c @@ -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); } /* |
