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>

diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index ee993e7..97e6233 100644 (file)
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -171,7 +171,9 @@ struct qib_ctxtdata {
        /* how many alloc_pages() chunks in rcvegrbuf_pages */
        u32 rcvegrbuf_chunks;
        /* how many egrbufs per chunk */
-       u32 rcvegrbufs_perchunk;
+       u16 rcvegrbufs_perchunk;
+       /* ilog2 of above */
+       u16 rcvegrbufs_perchunk_shift;
        /* order for rcvegrbuf_pages */
        size_t rcvegrbuf_size;
        /* rcvhdrq size (for freeing) */
@@ -940,7 +942,9 @@ struct qib_devdata {
        /* chip address space used by 4k pio buffers */
        u32 align4k;
        /* size of each rcvegrbuffer */
-       u32 rcvegrbufsize;
+       u16 rcvegrbufsize;
+       /* log2 of above */
+       u16 rcvegrbufsize_shift;
        /* localbus width (1, 2,4,8,16,32) from config space  */
        u32 lbus_width;
        /* localbus speed in MHz */

diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c
index 23e584f..89264ff 100644 (file)
--- 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);
 }
 
 /*

diff --git a/drivers/infiniband/hw/qib/qib_iba6120.c b/drivers/infiniband/hw/qib/qib_iba6120.c
index d8ca0a0..781a802 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_iba6120.c
+++ b/drivers/infiniband/hw/qib/qib_iba6120.c
@@ -3273,6 +3273,8 @@ static int init_6120_variables(struct qib_devdata *dd)
        /* we always allocate at least 2048 bytes for eager buffers */
        ret = ib_mtu_enum_to_int(qib_ibmtu);
        dd->rcvegrbufsize = ret != -1 ? max(ret, 2048) : QIB_DEFAULT_MTU;
+       BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
+       dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
        qib_6120_tidtemplate(dd);
 

diff --git a/drivers/infiniband/hw/qib/qib_iba7220.c b/drivers/infiniband/hw/qib/qib_iba7220.c
index e1f9474..3f1d562 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_iba7220.c
+++ b/drivers/infiniband/hw/qib/qib_iba7220.c
@@ -4085,6 +4085,8 @@ static int qib_init_7220_variables(struct qib_devdata *dd)
        /* we always allocate at least 2048 bytes for eager buffers */
        ret = ib_mtu_enum_to_int(qib_ibmtu);
        dd->rcvegrbufsize = ret != -1 ? max(ret, 2048) : QIB_DEFAULT_MTU;
+       BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
+       dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
        qib_7220_tidtemplate(dd);
 

diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index 5ea9ece..f3f4b55 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -6205,6 +6205,8 @@ static int qib_init_7322_variables(struct qib_devdata *dd)
 
        /* we always allocate at least 2048 bytes for eager buffers */
        dd->rcvegrbufsize = max(mtu, 2048);
+       BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
+       dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
        qib_7322_tidtemplate(dd);
 

diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index 021636d..21ffa7c 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -183,6 +183,9 @@ struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt)
                rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt +
                        rcd->rcvegrbufs_perchunk - 1) /
                        rcd->rcvegrbufs_perchunk;
+               BUG_ON(!is_power_of_2(rcd->rcvegrbufs_perchunk));
+               rcd->rcvegrbufs_perchunk_shift =
+                       ilog2(rcd->rcvegrbufs_perchunk);
        }
        return rcd;
 }