[PATCH net-next v4 7/8] net: ethtool: use the new helper in rss_set_prep_indir()

[Breno Leitao <leitao@debian.org>]

Refactor rss_set_prep_indir() to utilize the new
ethtool_get_rx_ring_count() helper for determining the number of RX
rings, replacing the direct use of get_rxnfc with ETHTOOL_GRXRINGS.

This ensures compatibility with both legacy and new ethtool_ops
interfaces by transparently multiplexing between them.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 net/ethtool/rss.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c
index 202d95e8bf3e1..4dced53be4b3b 100644
--- a/net/ethtool/rss.c
+++ b/net/ethtool/rss.c
@@ -620,23 +620,22 @@ rss_set_prep_indir(struct net_device *dev, struct genl_info *info,
 		   struct rss_reply_data *data, struct ethtool_rxfh_param *rxfh,
 		   bool *reset, bool *mod)
 {
-	const struct ethtool_ops *ops = dev->ethtool_ops;
 	struct netlink_ext_ack *extack = info->extack;
 	struct nlattr **tb = info->attrs;
-	struct ethtool_rxnfc rx_rings;
 	size_t alloc_size;
+	int num_rx_rings;
 	u32 user_size;
 	int i, err;
 
 	if (!tb[ETHTOOL_A_RSS_INDIR])
 		return 0;
-	if (!data->indir_size || !ops->get_rxnfc)
+	if (!data->indir_size)
 		return -EOPNOTSUPP;
 
-	rx_rings.cmd = ETHTOOL_GRXRINGS;
-	err = ops->get_rxnfc(dev, &rx_rings, NULL);
-	if (err)
+	err = ethtool_get_rx_ring_count(dev);
+	if (err < 0)
 		return err;
+	num_rx_rings = err;
 
 	if (nla_len(tb[ETHTOOL_A_RSS_INDIR]) % 4) {
 		NL_SET_BAD_ATTR(info->extack, tb[ETHTOOL_A_RSS_INDIR]);
@@ -665,7 +664,7 @@ rss_set_prep_indir(struct net_device *dev, struct genl_info *info,
 
 	nla_memcpy(rxfh->indir, tb[ETHTOOL_A_RSS_INDIR], alloc_size);
 	for (i = 0; i < user_size; i++) {
-		if (rxfh->indir[i] < rx_rings.data)
+		if (rxfh->indir[i] < num_rx_rings)
 			continue;
 
 		NL_SET_ERR_MSG_ATTR_FMT(extack, tb[ETHTOOL_A_RSS_INDIR],
@@ -682,7 +681,7 @@ rss_set_prep_indir(struct net_device *dev, struct genl_info *info,
 	} else {
 		for (i = 0; i < data->indir_size; i++)
 			rxfh->indir[i] =
-				ethtool_rxfh_indir_default(i, rx_rings.data);
+				ethtool_rxfh_indir_default(i, num_rx_rings);
 	}
 
 	*mod |= memcmp(rxfh->indir, data->indir_table, data->indir_size);

-- 
2.47.3