IB/mlx4: Do not attemp to report HCA clock offset on VFs

mlx4 VFs can provide CQE raw time-stamping services, but they
don't have the hca core clock mapped to their PCI bars.

As such, we should not attempt to query and report the clock offset
to user space for VFs. Doing so causes query_device over VFs to fail
with -ENOSUPP.

Fixes: 4b664c4355b2 ('IB/mlx4: Add support for CQ time-stamping')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 067a691ecbed449e098d333e8d82cf62c47ebd7a..f419a728a22b084fe1108dea2e647fe4eb4e2d05 100644 (file)
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -253,14 +253,15 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
        props->hca_core_clock = dev->dev->caps.hca_core_clock * 1000UL;
        props->timestamp_mask = 0xFFFFFFFFFFFFULL;
 
-       err = mlx4_get_internal_clock_params(dev->dev, &clock_params);
-       if (err)
-               goto out;
+       if (!mlx4_is_slave(dev->dev))
+               err = mlx4_get_internal_clock_params(dev->dev, &clock_params);
 
        if (uhw->outlen >= resp.response_length + sizeof(resp.hca_core_clock_offset)) {
-               resp.hca_core_clock_offset = clock_params.offset % PAGE_SIZE;
                resp.response_length += sizeof(resp.hca_core_clock_offset);
-               resp.comp_mask |= QUERY_DEVICE_RESP_MASK_TIMESTAMP;
+               if (!err && !mlx4_is_slave(dev->dev)) {
+                       resp.comp_mask |= QUERY_DEVICE_RESP_MASK_TIMESTAMP;
+                       resp.hca_core_clock_offset = clock_params.offset % PAGE_SIZE;
+               }
        }
 
        if (uhw->outlen) {