eth: sfc: migrate to new RXFH callbacks

Migrate to new callbacks added by commit 9bb00786fc61 ("net: ethtool:
add dedicated callbacks for getting and setting rxfh fields").

This driver's RXFH config is read only / fixed so the conversion
is purely factoring out the handling into a helper. One thing of
note that this is one of the two drivers which pays attention to
rss_context.

Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://patch.msgid.link/20250618203823.1336156-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 57 insertions, 48 deletions

diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c
index afbedca63b29..23c6a7df78d0 100644
--- a/drivers/net/ethernet/sfc/ethtool.c
+++ b/drivers/net/ethernet/sfc/ethtool.c
@@ -268,6 +268,7 @@ const struct ethtool_ops efx_ethtool_ops = {
 	.rxfh_priv_size		= sizeof(struct efx_rss_context_priv),
 	.get_rxfh		= efx_ethtool_get_rxfh,
 	.set_rxfh		= efx_ethtool_set_rxfh,
+	.get_rxfh_fields	= efx_ethtool_get_rxfh_fields,
 	.create_rxfh_context	= efx_ethtool_create_rxfh_context,
 	.modify_rxfh_context	= efx_ethtool_modify_rxfh_context,
 	.remove_rxfh_context	= efx_ethtool_remove_rxfh_context,
diff --git a/drivers/net/ethernet/sfc/ethtool_common.c b/drivers/net/ethernet/sfc/ethtool_common.c
index 2d734496733f..823263969f92 100644
--- a/drivers/net/ethernet/sfc/ethtool_common.c
+++ b/drivers/net/ethernet/sfc/ethtool_common.c
@@ -800,66 +800,72 @@ static int efx_ethtool_get_class_rule(struct efx_nic *efx,
 	return rc;
 }
 
-int efx_ethtool_get_rxnfc(struct net_device *net_dev,
-			  struct ethtool_rxnfc *info, u32 *rule_locs)
+int efx_ethtool_get_rxfh_fields(struct net_device *net_dev,
+				struct ethtool_rxfh_fields *info)
 {
 	struct efx_nic *efx = efx_netdev_priv(net_dev);
-	u32 rss_context = 0;
-	s32 rc = 0;
-
-	switch (info->cmd) {
-	case ETHTOOL_GRXRINGS:
-		info->data = efx->n_rx_channels;
-		return 0;
+	struct efx_rss_context_priv *ctx;
+	__u64 data;
+	int rc = 0;
 
-	case ETHTOOL_GRXFH: {
-		struct efx_rss_context_priv *ctx = &efx->rss_context.priv;
-		__u64 data;
+	ctx = &efx->rss_context.priv;
 
-		mutex_lock(&net_dev->ethtool->rss_lock);
-		if (info->flow_type & FLOW_RSS && info->rss_context) {
-			ctx = efx_find_rss_context_entry(efx, info->rss_context);
-			if (!ctx) {
-				rc = -ENOENT;
-				goto out_unlock;
-			}
+	mutex_lock(&net_dev->ethtool->rss_lock);
+	if (info->rss_context) {
+		ctx = efx_find_rss_context_entry(efx, info->rss_context);
+		if (!ctx) {
+			rc = -ENOENT;
+			goto out_unlock;
 		}
+	}
 
-		data = 0;
-		if (!efx_rss_active(ctx)) /* No RSS */
-			goto out_setdata_unlock;
+	data = 0;
+	if (!efx_rss_active(ctx)) /* No RSS */
+		goto out_setdata_unlock;
 
-		switch (info->flow_type & ~FLOW_RSS) {
-		case UDP_V4_FLOW:
-		case UDP_V6_FLOW:
-			if (ctx->rx_hash_udp_4tuple)
-				data = (RXH_L4_B_0_1 | RXH_L4_B_2_3 |
-					RXH_IP_SRC | RXH_IP_DST);
-			else
-				data = RXH_IP_SRC | RXH_IP_DST;
-			break;
-		case TCP_V4_FLOW:
-		case TCP_V6_FLOW:
+	switch (info->flow_type) {
+	case UDP_V4_FLOW:
+	case UDP_V6_FLOW:
+		if (ctx->rx_hash_udp_4tuple)
 			data = (RXH_L4_B_0_1 | RXH_L4_B_2_3 |
 				RXH_IP_SRC | RXH_IP_DST);
-			break;
-		case SCTP_V4_FLOW:
-		case SCTP_V6_FLOW:
-		case AH_ESP_V4_FLOW:
-		case AH_ESP_V6_FLOW:
-		case IPV4_FLOW:
-		case IPV6_FLOW:
+		else
 			data = RXH_IP_SRC | RXH_IP_DST;
-			break;
-		default:
-			break;
-		}
+		break;
+	case TCP_V4_FLOW:
+	case TCP_V6_FLOW:
+		data = (RXH_L4_B_0_1 | RXH_L4_B_2_3 |
+			RXH_IP_SRC | RXH_IP_DST);
+		break;
+	case SCTP_V4_FLOW:
+	case SCTP_V6_FLOW:
+	case AH_ESP_V4_FLOW:
+	case AH_ESP_V6_FLOW:
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+		data = RXH_IP_SRC | RXH_IP_DST;
+		break;
+	default:
+		break;
+	}
 out_setdata_unlock:
-		info->data = data;
+	info->data = data;
 out_unlock:
-		mutex_unlock(&net_dev->ethtool->rss_lock);
-		return rc;
-	}
+	mutex_unlock(&net_dev->ethtool->rss_lock);
+	return rc;
+}
+
+int efx_ethtool_get_rxnfc(struct net_device *net_dev,
+			  struct ethtool_rxnfc *info, u32 *rule_locs)
+{
+	struct efx_nic *efx = efx_netdev_priv(net_dev);
+	u32 rss_context = 0;
+	s32 rc = 0;
+
+	switch (info->cmd) {
+	case ETHTOOL_GRXRINGS:
+		info->data = efx->n_rx_channels;
+		return 0;
 
 	case ETHTOOL_GRXCLSRLCNT:
 		info->data = efx_filter_get_rx_id_limit(efx);
diff --git a/drivers/net/ethernet/sfc/ethtool_common.h b/drivers/net/ethernet/sfc/ethtool_common.h
index fc52e891637d..24db4fccbe78 100644
--- a/drivers/net/ethernet/sfc/ethtool_common.h
+++ b/drivers/net/ethernet/sfc/ethtool_common.h
@@ -49,6 +49,8 @@ int efx_ethtool_get_rxfh(struct net_device *net_dev,
 int efx_ethtool_set_rxfh(struct net_device *net_dev,
 			 struct ethtool_rxfh_param *rxfh,
 			 struct netlink_ext_ack *extack);
+int efx_ethtool_get_rxfh_fields(struct net_device *net_dev,
+				struct ethtool_rxfh_fields *info);
 int efx_ethtool_create_rxfh_context(struct net_device *net_dev,
 				    struct ethtool_rxfh_context *ctx,
 				    const struct ethtool_rxfh_param *rxfh,