Convert the ixgbe driver to use the new .get_rx_ring_count ethtool
operation for handling ETHTOOL_GRXRINGS command. This simplifies the
code by extracting the ring count logic into a dedicated callback.

The new callback provides the same functionality in a more direct way,
following the ongoing ethtool API modernization.

This was compile-tested only.

Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
---
Changes in v2:
- Explictly describe that the patch was compile-tested only.
- Link to v1: https://patch.msgid.link/20251112-ixgbe_gxrings-v1-1-960e139697fa@debian.org
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 2d660e9edb80..2ad81f687a84 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -2805,6 +2805,14 @@ static int ixgbe_rss_indir_tbl_max(struct ixgbe_adapter *adapter)
 		return 64;
 }
 
+static u32 ixgbe_get_rx_ring_count(struct net_device *dev)
+{
+	struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
+
+	return min_t(u32, adapter->num_rx_queues,
+		     ixgbe_rss_indir_tbl_max(adapter));
+}
+
 static int ixgbe_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
 			   u32 *rule_locs)
 {
@@ -2812,11 +2820,6 @@ static int ixgbe_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
 	int ret = -EOPNOTSUPP;
 
 	switch (cmd->cmd) {
-	case ETHTOOL_GRXRINGS:
-		cmd->data = min_t(int, adapter->num_rx_queues,
-				  ixgbe_rss_indir_tbl_max(adapter));
-		ret = 0;
-		break;
 	case ETHTOOL_GRXCLSRLCNT:
 		cmd->rule_cnt = adapter->fdir_filter_count;
 		ret = 0;
@@ -3743,6 +3746,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops = {
 	.get_ethtool_stats      = ixgbe_get_ethtool_stats,
 	.get_coalesce           = ixgbe_get_coalesce,
 	.set_coalesce           = ixgbe_set_coalesce,
+	.get_rx_ring_count	= ixgbe_get_rx_ring_count,
 	.get_rxnfc		= ixgbe_get_rxnfc,
 	.set_rxnfc		= ixgbe_set_rxnfc,
 	.get_rxfh_indir_size	= ixgbe_rss_indir_size,
@@ -3791,6 +3795,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops_e610 = {
 	.get_ethtool_stats      = ixgbe_get_ethtool_stats,
 	.get_coalesce           = ixgbe_get_coalesce,
 	.set_coalesce           = ixgbe_set_coalesce,
+	.get_rx_ring_count	= ixgbe_get_rx_ring_count,
 	.get_rxnfc		= ixgbe_get_rxnfc,
 	.set_rxnfc		= ixgbe_set_rxnfc,
 	.get_rxfh_indir_size	= ixgbe_rss_indir_size,

---
base-commit: bde974ef62569a7da12aa71d182a760cd6223c36
change-id: 20251112-ixgbe_gxrings-61c6f71d712b

Best regards,
--  
Breno Leitao <leitao@debian.org>