Subject: [PATCH net-next v4 02/12] eth: mvpp2: implement new RSS context API

From: Jakub Kicinski <[email-masked]>
Date: Thu, 8 Aug 2024 20:18:17 -0700

Implement the separate create/modify/delete ops for RSS.

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, it defaults to
an empty/previous indir table.

Note that there is no key at all, so we don't have to be
concerned with reporting the wrong one (which is addressed
by a patch later in the series).

Compile-tested only.

Reviewed-by: Edward Cree <[email-masked]>
Signed-off-by: Jakub Kicinski <[email-masked]>
---
v4:
 - adjust to meaning of max_context_id from net
v3:
 - fix max_context_id to be inclusive
 - extend commit message with why this is different than patch 6
v2:
 - copy the default indir table
 - use ID from the core
 - fix build issues

CC: [email-masked]
CC: [email-masked]
---
 .../net/ethernet/marvell/mvpp2/mvpp2_cls.c    |  18 +---
 .../net/ethernet/marvell/mvpp2/mvpp2_cls.h    |   2 +-
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 102 +++++++++++++-----
 3 files changed, 79 insertions(+), 43 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index 40aeaa7bd739..1641791a2d5b 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -1522,29 +1522,19 @@ static int mvpp22_rss_context_create(struct mvpp2_port *port, u32 *rss_ctx)
 	return 0;
 }
 
-int mvpp22_port_rss_ctx_create(struct mvpp2_port *port, u32 *port_ctx)
+int mvpp22_port_rss_ctx_create(struct mvpp2_port *port, u32 port_ctx)
 {
 	u32 rss_ctx;
-	int ret, i;
+	int ret;
 
 	ret = mvpp22_rss_context_create(port, &rss_ctx);
 	if (ret)
 		return ret;
 
-	/* Find the first available context number in the port, starting from 1.
-	 * Context 0 on each port is reserved for the default context.
-	 */
-	for (i = 1; i < MVPP22_N_RSS_TABLES; i++) {
-		if (port->rss_ctx[i] < 0)
-			break;
-	}
-
-	if (i == MVPP22_N_RSS_TABLES)
+	if (WARN_ON_ONCE(port->rss_ctx[port_ctx] >= 0))
 		return -EINVAL;
 
-	port->rss_ctx[i] = rss_ctx;
-	*port_ctx = i;
-
+	port->rss_ctx[port_ctx] = rss_ctx;
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
index 663157dc8062..85c9c6e80678 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
@@ -264,7 +264,7 @@ int mvpp22_port_rss_init(struct mvpp2_port *port);
 int mvpp22_port_rss_enable(struct mvpp2_port *port);
 int mvpp22_port_rss_disable(struct mvpp2_port *port);
 
-int mvpp22_port_rss_ctx_create(struct mvpp2_port *port, u32 *rss_ctx);
+int mvpp22_port_rss_ctx_create(struct mvpp2_port *port, u32 rss_ctx);
 int mvpp22_port_rss_ctx_delete(struct mvpp2_port *port, u32 rss_ctx);
 
 int mvpp22_port_rss_ctx_indir_set(struct mvpp2_port *port, u32 rss_ctx,
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 0d62a33afa80..90182f6fd9a1 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5696,38 +5696,80 @@ static int mvpp2_ethtool_get_rxfh(struct net_device *dev,
 	return ret;
 }
 
+static bool mvpp2_ethtool_rxfh_okay(struct mvpp2_port *port,
+				    const 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);
+	int ret = 0;
+
+	if (!mvpp2_ethtool_rxfh_okay(port, rxfh))
+		return -EOPNOTSUPP;
+
+	ctx->hfunc = ETH_RSS_HASH_CRC32;
+
+	ret = mvpp22_port_rss_ctx_create(port, rxfh->rss_context);
+	if (ret)
+		return ret;
+
+	if (!rxfh->indir)
+		ret = mvpp22_port_rss_ctx_indir_get(port, rxfh->rss_context,
+						    ethtool_rxfh_context_indir(ctx));
+	else
+		ret = mvpp22_port_rss_ctx_indir_set(port, rxfh->rss_context,
+						    rxfh->indir);
+	return ret;
+}
+
+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->indir)
+		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)
 {
-	struct mvpp2_port *port = netdev_priv(dev);
-	u32 *rss_context = &rxfh->rss_context;
-	int ret = 0;
-
-	if (!mvpp22_rss_is_supported(port))
-		return -EOPNOTSUPP;
-
-	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
-	    rxfh->hfunc != ETH_RSS_HASH_CRC32)
-		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,
-						    rxfh->indir);
-
-	return ret;
+	return mvpp2_modify_rxfh_context(dev, NULL, rxfh, extack);
 }
 
 /* Device ops */
@@ -5750,6 +5792,7 @@ 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 +5815,9 @@ 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,
+	.remove_rxfh_context	= mvpp2_remove_rxfh_context,
 };
 
 /* Used for PPv2.1, or PPv2.2 with the old Device Tree binding that
-- 
2.46.0