[PATCH net-next 02/12] eth: mvpp2: implement new RSS context API

[Jakub Kicinski <kuba@kernel.org>]

Implement the separate create/modify/delete ops for RSS.
No deep changes, just split of the logic.

No problems with IDs - even tho RSS tables are per device
the driver already seems to allocate IDs linearly per port
(there's a translation table from per-port context ID
to device context ID).

mvpp2 doesn't have a key for the hash, and indir table
is always specified at creation by the core, so the only
default we need to set for new contexts is hfunc.

Compile-tested only.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
CC: marcin.s.wojtas@gmail.com
CC: linux@armlinux.org.uk
---
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 81 ++++++++++++++-----
 1 file changed, 61 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 0d62a33afa80..e962959676ac 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5696,40 +5696,77 @@ static int mvpp2_ethtool_get_rxfh(struct net_device *dev,
 	return ret;
 }
 
-static int mvpp2_ethtool_set_rxfh(struct net_device *dev,
-				  struct ethtool_rxfh_param *rxfh,
-				  struct netlink_ext_ack *extack)
+static bool mvpp2_ethtool_rxfh_okay(struct mvpp2_port *port,
+				    struct ethtool_rxfh_param *rxfh)
+{
+	if (!mvpp22_rss_is_supported(port))
+		return false;
+
+	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
+	    rxfh->hfunc != ETH_RSS_HASH_CRC32)
+		return false;
+
+	if (rxfh->key)
+		return false;
+
+	return true;
+}
+
+static int mvpp2_create_rxfh_context(struct net_device *dev,
+				     struct ethtool_rxfh_context *ctx,
+				     const struct ethtool_rxfh_param *rxfh,
+				     struct netlink_ext_ack *extack)
 {
 	struct mvpp2_port *port = netdev_priv(dev);
 	u32 *rss_context = &rxfh->rss_context;
 	int ret = 0;
 
-	if (!mvpp22_rss_is_supported(port))
+	if (!mvpp2_ethtool_rxfh_okay(port, rxfh))
 		return -EOPNOTSUPP;
 
-	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
-	    rxfh->hfunc != ETH_RSS_HASH_CRC32)
+	ctx->hfunc = ETH_RSS_HASH_CRC32;
+
+	ret = mvpp22_port_rss_ctx_create(port, rss_context);
+	if (ret)
+		return ret;
+
+	return mvpp22_port_rss_ctx_indir_set(port, *rss_context, rxfh->indir);
+}
+
+static int mvpp2_modify_rxfh_context(struct net_device *dev,
+				     struct ethtool_rxfh_context *ctx,
+				     const struct ethtool_rxfh_param *rxfh,
+				     struct netlink_ext_ack *extack)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+	int ret = 0;
+
+	if (!mvpp2_ethtool_rxfh_okay(port, rxfh))
 		return -EOPNOTSUPP;
 
-	if (rxfh->key)
-		return -EOPNOTSUPP;
-
-	if (*rss_context && rxfh->rss_delete)
-		return mvpp22_port_rss_ctx_delete(port, *rss_context);
-
-	if (*rss_context == ETH_RXFH_CONTEXT_ALLOC) {
-		ret = mvpp22_port_rss_ctx_create(port, rss_context);
-		if (ret)
-			return ret;
-	}
-
 	if (rxfh->indir)
-		ret = mvpp22_port_rss_ctx_indir_set(port, *rss_context,
+		ret = mvpp22_port_rss_ctx_indir_set(port, rxfh->rss_context,
 						    rxfh->indir);
-
 	return ret;
 }
 
+static int mvpp2_remove_rxfh_context(struct net_device *dev,
+				     struct ethtool_rxfh_context *ctx,
+				     u32 rss_context,
+				     struct netlink_ext_ack *extack)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+
+	return mvpp22_port_rss_ctx_delete(port, rss_context);
+}
+
+static int mvpp2_ethtool_set_rxfh(struct net_device *dev,
+				  struct ethtool_rxfh_param *rxfh,
+				  struct netlink_ext_ack *extack)
+{
+	return mvpp2_modify_rxfh_context(dev, NULL, rxfh, extack);
+}
+
 /* Device ops */
 
 static const struct net_device_ops mvpp2_netdev_ops = {
@@ -5750,6 +5787,7 @@ static const struct net_device_ops mvpp2_netdev_ops = {
 
 static const struct ethtool_ops mvpp2_eth_tool_ops = {
 	.cap_rss_ctx_supported	= true,
+	.rxfh_max_context_id	= MVPP22_N_RSS_TABLES,
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
 	.nway_reset		= mvpp2_ethtool_nway_reset,
@@ -5772,6 +5810,9 @@ static const struct ethtool_ops mvpp2_eth_tool_ops = {
 	.get_rxfh_indir_size	= mvpp2_ethtool_get_rxfh_indir_size,
 	.get_rxfh		= mvpp2_ethtool_get_rxfh,
 	.set_rxfh		= mvpp2_ethtool_set_rxfh,
+	.create_rxfh_context	= mvpp2_create_rxfh_context,
+	.modify_rxfh_context	= mvpp2_modify_rxfh_context,
+	.delete_rxfh_context	= mvpp2_delete_rxfh_context,
 };
 
 /* Used for PPv2.1, or PPv2.2 with the old Device Tree binding that
-- 
2.45.2