[RFC net-next 5/5] r8169: enable RSS on the RTL8125B

[Vlad Banea <montrealtango@gmail.com>]

The RTL8125B has four RSS queues with the vector-map interrupt model:
RX queue N on vector N, TX on 16, link change on 21, and at least 22
vectors. RSS requires the type 3 descriptor. The RTL8125A has neither,
so enable this for RTL_GIGA_MAC_VER_63 only.

Hash on TCP and IP only: the RTL8125B does not spread UDP flows by port.

Signed-off-by: Vlad Banea <montrealtango@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 27 ++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 85e2c03fa61d..a313216998d2 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -78,6 +78,7 @@
 #define R8169_TX_STOP_THRS	(MAX_SKB_FRAGS + 1)
 #define R8169_TX_START_THRS	(2 * R8169_TX_STOP_THRS)
 #define R8169_MAX_RX_QUEUES	8
+#define R8125B_MAX_RX_QUEUES	4
 #define R8169_DEFAULT_RX_QUEUES	1
 #define R8169_MAX_TX_QUEUES	1
 #define R8169_IRQ_DEFAULT	1
@@ -880,6 +881,13 @@ struct rtl_vec_map {
 	u8 max_nvecs;
 };
 
+static const struct rtl_vec_map rtl_vec_map_8125b = {
+	.tx		= 16,
+	.linkchg	= 21,
+	.min_nvecs	= 22,
+	.max_nvecs	= 32,
+};
+
 static const struct rtl_vec_map rtl_vec_map_8127 = {
 	.tx		= 8,
 	.linkchg	= 29,
@@ -1835,7 +1843,8 @@ static enum rtl_sfp_mode rtl_get_sfp_mode(struct rtl8169_private *tp)
 
 static bool rtl_hw_support_rss(struct rtl8169_private *tp)
 {
-	return tp->mac_version == RTL_GIGA_MAC_VER_80;
+	return tp->mac_version == RTL_GIGA_MAC_VER_63 ||
+	       tp->mac_version == RTL_GIGA_MAC_VER_80;
 }
 
 static enum rtl_dash_type rtl_get_dash_type(struct rtl8169_private *tp)
@@ -2965,6 +2974,20 @@ static void rtl_setup_rx_params(struct rtl8169_private *tp)
 {
 	tp->num_rx_rings = 1;
 	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_63:
+		/* The UDP hash types do not spread UDP flows by port on the
+		 * RTL8125B, so hash TCP and IP only.
+		 */
+		tp->hw_supp_num_rx_queues = R8125B_MAX_RX_QUEUES;
+		tp->rss_data->hw_supp_indir_tbl_entries = RTL_MAX_INDIRECTION_TABLE_ENTRIES;
+		tp->rss_data->hash_types = RSS_CTRL_TCP_IPV4_SUPP |
+					   RSS_CTRL_IPV4_SUPP |
+					   RSS_CTRL_IPV6_SUPP |
+					   RSS_CTRL_IPV6_EXT_SUPP |
+					   RSS_CTRL_TCP_IPV6_SUPP |
+					   RSS_CTRL_TCP_IPV6_EXT_SUPP;
+		tp->rss_desc_type = RX_DESC_TYPE_V3;
+		break;
 	case RTL_GIGA_MAC_VER_80:
 		tp->hw_supp_num_rx_queues = R8169_MAX_RX_QUEUES;
 		tp->rss_data->hw_supp_indir_tbl_entries = RTL_MAX_INDIRECTION_TABLE_ENTRIES;
@@ -6236,6 +6259,8 @@ static void rtl_set_irq_mask(struct rtl8169_private *tp)
 static const struct rtl_vec_map *rtl_get_vec_map(struct rtl8169_private *tp)
 {
 	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_63:
+		return &rtl_vec_map_8125b;
 	case RTL_GIGA_MAC_VER_80:
 		return &rtl_vec_map_8127;
 	default:
-- 
2.53.0