[PATCH net-next] net: libwx: Add ethtool -L support for VF drivers

[Mengyuan Lou <mengyuanlou@net-swift.com>]

Implement get_channels and set_channels ethtool operations for Wangxun
VF net_device instances in libwx.

This allows users to query and dynamically reconfigure the number of RX/TX
channels on VF interfaces via `ethtool -l/ -L`.

Specifically:
- Add wx_get_channels_vf() and wx_set_channels_vf() to report and update
  channel limits and combined queue counts.
- Re-evaluate RSS limits in txgbevf_set_num_queues() based on user settings
  stored in wx->ring_feature[RING_F_RSS].limit.
- Adjust VF MRQC RSS hash mask logic in wx_setup_vfmrqc_vf() to correctly
  match queue configuration thresholds.

Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
---
 .../net/ethernet/wangxun/libwx/wx_ethtool.c   | 64 +++++++++++++++++++
 .../net/ethernet/wangxun/libwx/wx_vf_lib.c    |  2 +-
 .../ethernet/wangxun/txgbevf/txgbevf_main.c   |  3 +
 3 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
index 940d2e59876c..d24370790941 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
@@ -564,6 +564,68 @@ int wx_set_channels(struct net_device *dev,
 }
 EXPORT_SYMBOL(wx_set_channels);
 
+static void wx_get_channels_vf(struct net_device *dev,
+			       struct ethtool_channels *ch)
+{
+	struct wx *wx = netdev_priv(dev);
+
+	/* report maximum channels */
+	ch->max_combined = wx->mac.max_rx_queues;
+
+	ch->max_other = 1;
+	ch->other_count = 1;
+
+	/* record current channels */
+	ch->combined_count = wx->num_rx_queues;
+}
+
+static int wx_set_channels_vf(struct net_device *dev,
+			      struct ethtool_channels *ch)
+{
+	struct wx *wx = netdev_priv(dev);
+	u16 rss_limit;
+	int ret;
+
+	rss_limit = wx->ring_feature[RING_F_RSS].limit;
+
+	/* verify other_count has not changed */
+	if (ch->other_count != 1)
+		return -EINVAL;
+
+	/* verify the number of channels does not exceed hardware limits */
+	if (ch->combined_count > wx->mac.max_rx_queues)
+		return -EINVAL;
+
+	/* if device is resetting, do nothing */
+	if (test_bit(WX_STATE_RESETTING, wx->state))
+		return -EBUSY;
+
+	wx->ring_feature[RING_F_RSS].limit = ch->combined_count;
+
+	if (netif_running(dev))
+		wxvf_close(dev);
+
+	wx_clear_interrupt_scheme(wx);
+
+	ret = wx_init_interrupt_scheme(wx);
+	if (ret)
+		goto err_out;
+
+	if (netif_running(dev)) {
+		ret = wxvf_open(dev);
+		if (ret)
+			goto err_close;
+	}
+
+	return 0;
+
+err_close:
+	wx_clear_interrupt_scheme(wx);
+err_out:
+	wx->ring_feature[RING_F_RSS].limit = rss_limit;
+	return ret;
+}
+
 u32 wx_rss_indir_size(struct net_device *netdev)
 {
 	struct wx *wx = netdev_priv(netdev);
@@ -852,6 +914,8 @@ static const struct ethtool_ops wx_ethtool_ops_vf = {
 	.set_coalesce		= wx_set_coalesce,
 	.get_ts_info		= ethtool_op_get_ts_info,
 	.get_link_ksettings	= wx_get_link_ksettings_vf,
+	.get_channels		= wx_get_channels_vf,
+	.set_channels		= wx_set_channels_vf,
 };
 
 void wx_set_ethtool_ops_vf(struct net_device *netdev)
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_vf_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_vf_lib.c
index 7325b475ee10..6fec3ab5e4e4 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_vf_lib.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_vf_lib.c
@@ -237,7 +237,7 @@ void wx_setup_vfmrqc_vf(struct wx *wx)
 
 	vfmrqc |= WX_VXMRQC_RSS_EN;
 
-	if (wx->num_rx_queues > 3)
+	if (wx->num_rx_queues >= 3)
 		vfmrqc |= WX_VXMRQC_RSS_HASH(2);
 	else if (wx->num_rx_queues > 1)
 		vfmrqc |= WX_VXMRQC_RSS_HASH(1);
diff --git a/drivers/net/ethernet/wangxun/txgbevf/txgbevf_main.c b/drivers/net/ethernet/wangxun/txgbevf/txgbevf_main.c
index 8b16b900820a..6e8659082051 100644
--- a/drivers/net/ethernet/wangxun/txgbevf/txgbevf_main.c
+++ b/drivers/net/ethernet/wangxun/txgbevf/txgbevf_main.c
@@ -72,6 +72,9 @@ static void txgbevf_set_num_queues(struct wx *wx)
 		queue = min_t(u16, wx->mac.max_rx_queues, wx->mac.max_tx_queues);
 		rss = min_t(u16, queue, rss);
 
+		if (wx->ring_feature[RING_F_RSS].limit)
+			rss = min_t(u16, rss, wx->ring_feature[RING_F_RSS].limit);
+
 		if (wx->vfinfo->vf_api >= wx_mbox_api_13) {
 			wx->num_rx_queues = rss;
 			wx->num_tx_queues = rss;
-- 
2.30.1