net: ethtool: pass a pointer to parameters to get/set_rxfh ethtool ops

The get/set_rxfh ethtool ops currently takes the rxfh (RSS) parameters
as direct function arguments. This will force us to change the API (and
all drivers' functions) every time some new parameters are added.

This is part 1/2 of the fix, as suggested in [1]:

- First simplify the code by always providing a pointer to all params
   (indir, key and func); the fact that some of them may be NULL seems
   like a weird historic thing or a premature optimization.
   It will simplify the drivers if all pointers are always present.

 - Then make the functions take a dev pointer, and a pointer to a
   single struct wrapping all arguments. The set_* should also take
   an extack.

Link: https://lore.kernel.org/netdev/20231121152906.2dd5f487@kernel.org/ [1]
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Suggested-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Link: https://lore.kernel.org/r/20231213003321.605376-2-ahmed.zaki@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 21 insertions, 19 deletions

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c b/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
index f4b680286911..0304f03d4093 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
@@ -1137,7 +1137,7 @@ static int hinic_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
 }
 
 static int hinic_get_rxfh(struct net_device *netdev,
-			  u32 *indir, u8 *key, u8 *hfunc)
+			  struct ethtool_rxfh_param *rxfh)
 {
 	struct hinic_dev *nic_dev = netdev_priv(netdev);
 	u8 hash_engine_type = 0;
@@ -1146,32 +1146,33 @@ static int hinic_get_rxfh(struct net_device *netdev,
 	if (!(nic_dev->flags & HINIC_RSS_ENABLE))
 		return -EOPNOTSUPP;
 
-	if (hfunc) {
-		err = hinic_rss_get_hash_engine(nic_dev,
-						nic_dev->rss_tmpl_idx,
-						&hash_engine_type);
-		if (err)
-			return -EFAULT;
+	err = hinic_rss_get_hash_engine(nic_dev,
+					nic_dev->rss_tmpl_idx,
+					&hash_engine_type);
+	if (err)
+		return -EFAULT;
 
-		*hfunc = hash_engine_type ? ETH_RSS_HASH_TOP : ETH_RSS_HASH_XOR;
-	}
+	rxfh->hfunc = hash_engine_type ? ETH_RSS_HASH_TOP : ETH_RSS_HASH_XOR;
 
-	if (indir) {
+	if (rxfh->indir) {
 		err = hinic_rss_get_indir_tbl(nic_dev,
-					      nic_dev->rss_tmpl_idx, indir);
+					      nic_dev->rss_tmpl_idx,
+					      rxfh->indir);
 		if (err)
 			return -EFAULT;
 	}
 
-	if (key)
+	if (rxfh->key)
 		err = hinic_rss_get_template_tbl(nic_dev,
-						 nic_dev->rss_tmpl_idx, key);
+						 nic_dev->rss_tmpl_idx,
+						 rxfh->key);
 
 	return err;
 }
 
-static int hinic_set_rxfh(struct net_device *netdev, const u32 *indir,
-			  const u8 *key, const u8 hfunc)
+static int hinic_set_rxfh(struct net_device *netdev,
+			  struct ethtool_rxfh_param *rxfh,
+			  struct netlink_ext_ack *extack)
 {
 	struct hinic_dev *nic_dev = netdev_priv(netdev);
 	int err = 0;
@@ -1179,11 +1180,12 @@ static int hinic_set_rxfh(struct net_device *netdev, const u32 *indir,
 	if (!(nic_dev->flags & HINIC_RSS_ENABLE))
 		return -EOPNOTSUPP;
 
-	if (hfunc != ETH_RSS_HASH_NO_CHANGE) {
-		if (hfunc != ETH_RSS_HASH_TOP && hfunc != ETH_RSS_HASH_XOR)
+	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE) {
+		if (rxfh->hfunc != ETH_RSS_HASH_TOP &&
+		    rxfh->hfunc != ETH_RSS_HASH_XOR)
 			return -EOPNOTSUPP;
 
-		nic_dev->rss_hash_engine = (hfunc == ETH_RSS_HASH_XOR) ?
+		nic_dev->rss_hash_engine = (rxfh->hfunc == ETH_RSS_HASH_XOR) ?
 			HINIC_RSS_HASH_ENGINE_TYPE_XOR :
 			HINIC_RSS_HASH_ENGINE_TYPE_TOEP;
 		err = hinic_rss_set_hash_engine
@@ -1193,7 +1195,7 @@ static int hinic_set_rxfh(struct net_device *netdev, const u32 *indir,
 			return -EFAULT;
 	}
 
-	err = __set_rss_rxfh(netdev, indir, key);
+	err = __set_rss_rxfh(netdev, rxfh->indir, rxfh->key);
 
 	return err;
 }