1 files changed, 20 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index e1317f581168..fac5c6e68011 100644
--- a/drivers/infiniband/hw/cxgb4/cq.c
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -764,7 +764,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
         struct c4iw_create_cq_resp uresp;
         struct c4iw_ucontext *ucontext = NULL;
         int ret;
-        size_t memsize;
+        size_t memsize, hwentries;
         struct c4iw_mm_entry *mm, *mm2;
 
         PDBG("%s ib_dev %p entries %d\n", __func__, ibdev, entries);
@@ -788,14 +788,29 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
          * entries must be multiple of 16 for HW.
          */
         entries = roundup(entries, 16);
-        memsize = entries * sizeof *chp->cq.queue;
+
+        /*
+         * Make actual HW queue 2x to avoid cdix_inc overflows.
+         */
+        hwentries = entries * 2;
+
+        /*
+         * Make HW queue at least 64 entries so GTS updates aren't too
+         * frequent.
+         */
+        if (hwentries < 64)
+                hwentries = 64;
+
+        memsize = hwentries * sizeof *chp->cq.queue;
 
         /*
          * memsize must be a multiple of the page size if its a user cq.
          */
-        if (ucontext)
+        if (ucontext) {
                 memsize = roundup(memsize, PAGE_SIZE);
-        chp->cq.size = entries;
+                hwentries = memsize / sizeof *chp->cq.queue;
+        }
+        chp->cq.size = hwentries;
         chp->cq.memsize = memsize;
 
         ret = create_cq(&rhp->rdev, &chp->cq,
@@ -805,7 +820,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
 
         chp->rhp = rhp;
         chp->cq.size--;                         /* status page */
-        chp->ibcq.cqe = chp->cq.size - 1;
+        chp->ibcq.cqe = entries - 2;
         spin_lock_init(&chp->lock);
         atomic_set(&chp->refcnt, 1);
         init_waitqueue_head(&chp->wait);