IB/qib: Add prefetch for eager buffers

Add a prefetch call when a packet has been stored.  The nature of the
prefetch is correctly determined by the alternatives mechanism.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c
index 6fc9365ba8a6..8895cfec5019 100644
--- a/drivers/infiniband/hw/qib/qib_driver.c
+++ b/drivers/infiniband/hw/qib/qib_driver.c
@@ -38,6 +38,7 @@
 #include <linux/netdevice.h>
 #include <linux/vmalloc.h>
 #include <linux/module.h>
+#include <linux/prefetch.h>
 
 #include "qib.h"
 
@@ -481,8 +482,10 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
                         etail = qib_hdrget_index(rhf_addr);
                         updegr = 1;
                         if (tlen > sizeof(*hdr) ||
-                            etype >= RCVHQ_RCV_TYPE_NON_KD)
+                            etype >= RCVHQ_RCV_TYPE_NON_KD) {
                                 ebuf = qib_get_egrbuf(rcd, etail);
+                                prefetch_range(ebuf, tlen - sizeof(*hdr));
+                        }
                 }
                 if (!eflags) {
                         u16 lrh_len = be16_to_cpu(hdr->lrh[2]) << 2;