net: nvethernet: Fix build for Linux v6.8

The ethtool_ops function pointers get_rxfh and set_rxfh were updated for
Linux v6.8 to pass arguments via a new 'ethtool_rxfh_param' structure.
Add a new test for conftest to detect if the get_rxfh and set_rxfh
functions support the 'ethtool_rxfh_param' structure and update the
nvethernet driver accordingly for Linux v6.8.

Bug 4448428

Change-Id: Ia1c49d88c4ac73539454b010af92c261e14be4bf
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3037949
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/net/ethernet/nvidia/nvethernet/ethtool.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-// Copyright (c) 2019-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Copyright (c) 2019-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
 #include <nvidia/conftest.h>
 
@@ -1455,11 +1455,21 @@ static u32 ether_get_rxfh_indir_size(struct net_device *ndev)
  *
  * @retval 0 on success
  */
+#if defined(NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS)
+static int ether_get_rxfh(struct net_device *ndev,
+			  struct ethtool_rxfh_param *rxfh)
+#else
 static int ether_get_rxfh(struct net_device *ndev, u32 *indir, u8 *key,
 			  u8 *hfunc)
+#endif
 {
 	struct ether_priv_data *pdata = netdev_priv(ndev);
 	struct osi_core_priv_data *osi_core = pdata->osi_core;
+#if defined(NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS)
+	u32 *indir = rxfh->indir;
+	u8 *hfunc = &rxfh->hfunc;
+	u8 *key = rxfh->key;
+#endif
 	int i;
 
 	if (indir) {
@@ -1487,12 +1497,23 @@ static int ether_get_rxfh(struct net_device *ndev, u32 *indir, u8 *key,
  * @retval 0 on success
  * @retval -1 on failure.
  */
+#if defined(NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS)
+static int ether_set_rxfh(struct net_device *ndev,
+			  struct ethtool_rxfh_param *rxfh,
+			  struct netlink_ext_ack *extack)
+#else
 static int ether_set_rxfh(struct net_device *ndev, const u32 *indir,
 			  const u8 *key, const u8 hfunc)
+#endif
 {
 	struct ether_priv_data *pdata = netdev_priv(ndev);
 	struct osi_core_priv_data *osi_core = pdata->osi_core;
 	struct osi_ioctl ioctl_data = {};
+#if defined(NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS)
+	u32 *indir = rxfh->indir;
+	u8 hfunc = rxfh->hfunc;
+	u8 *key = rxfh->key;
+#endif
 	int i;
 
 	if (!netif_running(ndev)) {

scripts/conftest/Makefile

@@ -117,6 +117,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_mode_config_struct_has_fb_base_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_scdc_get_set_has_struct_drm_connector_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_coalesce_has_coal_and_extack_args
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_ringparam_has_ringparam_and_extack_args
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_rxfh_has_rxfh_param_args
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += get_file_rcu_has_double_ptr_file_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += get_user_pages
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += i2c_new_client_device

scripts/conftest/conftest.sh

@@ -7035,6 +7035,28 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_ETHTOOL_OPS_GET_SET_RINGPARAM_HAS_RINGPARAM_AND_EXTACT_ARGS" "" "types"
         ;;
 
+        ethtool_ops_get_set_rxfh_has_rxfh_param_args)
+            #
+            # Determine if the 'get_rxfh' and 'set_rxfh' ethtool_ops functions
+            # support the 'ethtool_rxfh_param' argument.
+            #
+            # Added by commit fb6e30a72539 ("net: ethtool: pass a pointer to
+            # parameters to get/set_rxfh ethtool ops") in Linux v6.8.
+            #
+            CODE="
+            #include <linux/ethtool.h>
+            #include <linux/netdevice.h>
+            #include <linux/netlink.h>
+            #include <uapi/linux/ethtool.h>
+            void conftest_ethtool_ops_get_set_rxfh_has_rxfh_param_args(struct ethtool_ops *ops) {
+                    int (*fn)(struct net_device *,
+                    struct ethtool_rxfh_param *rxfh) = ops->get_rxfh;
+            }"
+
+            compile_check_conftest "$CODE" \
+                    "NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS" "" "types"
+        ;;
+
         netif_set_tso_max_size)
             #
             # Determine if netif_set_tso_max_size() function is present