RDMA/cxgb4: Max fastreg depth depends on DSGL support

The max depth of a fastreg mr depends on whether the device supports
DSGL or not.  So compute it dynamically based on the device support
and the module use_dsgl option.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 9b4a8b88908e..2c037e1746d3 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -566,7 +566,8 @@ static int build_fastreg(struct t4_sq *sq, union t4_wr *wqe,
         int pbllen = roundup(wr->wr.fast_reg.page_list_len * sizeof(u64), 32);
         int rem;
 
-        if (wr->wr.fast_reg.page_list_len > T4_MAX_FR_DEPTH)
+        if (wr->wr.fast_reg.page_list_len >
+            t4_max_fr_depth(use_dsgl))
                 return -EINVAL;
 
         wqe->fr.qpbinde_to_dcacpu = 0;