[PATCH net-next 02/12] sfc_ef100: fail the probe if NIC uses unsol_ev credits

[Edward Cree]

In the future, EF100 is planned to have a credit-based scheme for
 handling unsolicited events, which drivers will need to use in order
 to function correctly.  However, current EF100 hardware does not yet
 generate unsolicited events and the credit scheme has not yet been
 implemented in firmware.  To prevent compatibility problems later if
 the current driver is used with future firmware which does implement
 it, we check for the corresponding capability flag (which that
 future firmware will set), and if found, we refuse to probe.

Signed-off-by: Edward Cree <ec...@solarflare.com>
---
 drivers/net/ethernet/sfc/ef100_nic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/sfc/ef100_nic.c 
b/drivers/net/ethernet/sfc/ef100_nic.c
index 75131bcf4f1a..c2bec2bdbc1f 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -602,6 +602,12 @@ static int ef100_probe_main(struct efx_nic *efx)
                goto fail;
        }
 
+       if (efx_has_cap(efx, UNSOL_EV_CREDIT_SUPPORTED)) {
+               netif_info(efx, drv, efx->net_dev, "Firmware uses 
unsolicited-event credits\n");
+               rc = -EINVAL;
+               goto fail;
+       }
+
        rc = ef100_phy_probe(efx);
        if (rc)
                goto fail;