Date: Thu, 13 Jun 2024 01:47:44 +0000
From: Ziwei Xiao <ziweixiao@...gle.com>
To: netdev@...r.kernel.org
Cc: jeroendb@...gle.com, pkaligineedi@...gle.com, shailend@...gle.com, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	willemb@...gle.com, hramamurthy@...gle.com, ziweixiao@...gle.com, 
	rushilg@...gle.com, horms@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 5/5] gve: Add flow steering ethtool support

From: Jeroen de Borst <jeroendb@...gle.com>

Implement the ethtool commands that can be used to configure and query
flow-steering rules. For these ethtool commands, the driver will
temporarily drop the rtnl lock to reduce the latency for the flow
steering commands on separate NICs. It will then be protected by the new
added adminq lock.

A large part of this change consists of translating the ethtool
representation of 'ntuples' to our internal gve_flow_rule and vice-versa
in the new created gve_flow_rule.c

Considering the possible large amount of flow rules, the driver doesn't
store all the rules locally. When the user runs 'ethtool -n <nic>' to
check the registered rules, the driver will send adminq command to
query a limited amount of rules/rule ids(that filled in a 4096 bytes dma
memory) at a time as a cache for the ethtool queries. The adminq query
commands will be repeated for several times until the ethtool has
queried all the needed rules.

Signed-off-by: Jeroen de Borst <jeroendb@...gle.com>
Co-developed-by: Ziwei Xiao <ziweixiao@...gle.com>
Signed-off-by: Ziwei Xiao <ziweixiao@...gle.com>
Reviewed-by: Praveen Kaligineedi <pkaligineedi@...gle.com>
Reviewed-by: Harshitha Ramamurthy <hramamurthy@...gle.com>
Reviewed-by: Willem de Bruijn <willemb@...gle.com>
---
Changes in v2:
	- Fix the sparse warning of be16_to_cpu by switching to use the
	  new added structure gve_adminq_queried_flow_rule from the
	  previous patch to do the be16_to_cpu operations
	- Use kvfree instead of kfree for the rule allocated by kvzalloc
	- Delete the check that disallows rx queue count changing when
	  there are rules alive because it already has a check in
	  net/ethtool/channels.c that ensures rx queue count change to
	  be failed if requested channel counts are too low for existing
	  ntuple filter settings

 drivers/net/ethernet/google/gve/Makefile      |   2 +-
 drivers/net/ethernet/google/gve/gve.h         |   8 +-
 drivers/net/ethernet/google/gve/gve_ethtool.c |  80 ++++-
 .../net/ethernet/google/gve/gve_flow_rule.c   | 298 ++++++++++++++++++
 drivers/net/ethernet/google/gve/gve_main.c    |  32 +-
 5 files changed, 411 insertions(+), 9 deletions(-)
 create mode 100644 drivers/net/ethernet/google/gve/gve_flow_rule.c

diff --git a/drivers/net/ethernet/google/gve/Makefile b/drivers/net/ethernet/google/gve/Makefile
index b9a6be76531b..9ed07080b38a 100644
--- a/drivers/net/ethernet/google/gve/Makefile
+++ b/drivers/net/ethernet/google/gve/Makefile
@@ -1,4 +1,4 @@
 # Makefile for the Google virtual Ethernet (gve) driver
 
 obj-$(CONFIG_GVE) += gve.o
-gve-objs := gve_main.o gve_tx.o gve_tx_dqo.o gve_rx.o gve_rx_dqo.o gve_ethtool.o gve_adminq.o gve_utils.o
+gve-objs := gve_main.o gve_tx.o gve_tx_dqo.o gve_rx.o gve_rx_dqo.o gve_ethtool.o gve_adminq.o gve_utils.o gve_flow_rule.o
diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index b9e9dd958f3c..84ac004d3953 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: (GPL-2.0 OR MIT)
  * Google virtual Ethernet (gve) driver
  *
- * Copyright (C) 2015-2021 Google, Inc.
+ * Copyright (C) 2015-2024 Google LLC
  */
 
 #ifndef _GVE_H_
@@ -1170,6 +1170,12 @@ int gve_adjust_config(struct gve_priv *priv,
 int gve_adjust_queues(struct gve_priv *priv,
 		      struct gve_queue_config new_rx_config,
 		      struct gve_queue_config new_tx_config);
+/* flow steering rule */
+int gve_get_flow_rule_entry(struct gve_priv *priv, struct ethtool_rxnfc *cmd);
+int gve_get_flow_rule_ids(struct gve_priv *priv, struct ethtool_rxnfc *cmd, u32 *rule_locs);
+int gve_add_flow_rule(struct gve_priv *priv, struct ethtool_rxnfc *cmd);
+int gve_del_flow_rule(struct gve_priv *priv, struct ethtool_rxnfc *cmd);
+int gve_flow_rules_reset(struct gve_priv *priv);
 /* report stats handling */
 void gve_handle_report_stats(struct gve_priv *priv);
 /* exported by ethtool.c */
diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c
index ffaa878d67bc..01ff72be0dca 100644
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c
+++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
 /* Google virtual Ethernet (gve) driver
  *
- * Copyright (C) 2015-2021 Google, Inc.
+ * Copyright (C) 2015-2024 Google LLC
  */
 
 #include <linux/rtnetlink.h>
@@ -775,6 +775,82 @@ static int gve_set_coalesce(struct net_device *netdev,
 	return 0;
 }
 
+static int gve_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
+{
+	struct gve_priv *priv = netdev_priv(netdev);
+	int err = 0;
+
+	if (!(netdev->features & NETIF_F_NTUPLE))
+		return -EOPNOTSUPP;
+
+	dev_hold(netdev);
+	rtnl_unlock();
+
+	switch (cmd->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		err = gve_add_flow_rule(priv, cmd);
+		break;
+	case ETHTOOL_SRXCLSRLDEL:
+		err = gve_del_flow_rule(priv, cmd);
+		break;
+	case ETHTOOL_SRXFH:
+		err = -EOPNOTSUPP;
+		break;
+	default:
+		err = -EOPNOTSUPP;
+		break;
+	}
+
+	rtnl_lock();
+	dev_put(netdev);
+	return err;
+}
+
+static int gve_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd, u32 *rule_locs)
+{
+	struct gve_priv *priv = netdev_priv(netdev);
+	int err = 0;
+
+	dev_hold(netdev);
+	rtnl_unlock();
+
+	switch (cmd->cmd) {
+	case ETHTOOL_GRXRINGS:
+		cmd->data = priv->rx_cfg.num_queues;
+		break;
+	case ETHTOOL_GRXCLSRLCNT:
+		if (!priv->max_flow_rules) {
+			err = -EOPNOTSUPP;
+			goto out;
+		}
+
+		err = gve_adminq_query_flow_rules(priv, GVE_FLOW_RULE_QUERY_STATS, 0);
+		if (err)
+			goto out;
+
+		cmd->rule_cnt = priv->num_flow_rules;
+		cmd->data = priv->max_flow_rules;
+		break;
+	case ETHTOOL_GRXCLSRULE:
+		err = gve_get_flow_rule_entry(priv, cmd);
+		break;
+	case ETHTOOL_GRXCLSRLALL:
+		err = gve_get_flow_rule_ids(priv, cmd, (u32 *)rule_locs);
+		break;
+	case ETHTOOL_GRXFH:
+		err = -EOPNOTSUPP;
+		break;
+	default:
+		err = -EOPNOTSUPP;
+		break;
+	}
+
+out:
+	rtnl_lock();
+	dev_put(netdev);
+	return err;
+}
+
 const struct ethtool_ops gve_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS,
 	.supported_ring_params = ETHTOOL_RING_USE_TCP_DATA_SPLIT,
@@ -786,6 +862,8 @@ const struct ethtool_ops gve_ethtool_ops = {
 	.get_msglevel = gve_get_msglevel,
 	.set_channels = gve_set_channels,
 	.get_channels = gve_get_channels,
+	.set_rxnfc = gve_set_rxnfc,
+	.get_rxnfc = gve_get_rxnfc,
 	.get_link = ethtool_op_get_link,
 	.get_coalesce = gve_get_coalesce,
 	.set_coalesce = gve_set_coalesce,
diff --git a/drivers/net/ethernet/google/gve/gve_flow_rule.c b/drivers/net/ethernet/google/gve/gve_flow_rule.c
new file mode 100644
index 000000000000..0bb8cd1876a3
--- /dev/null
+++ b/drivers/net/ethernet/google/gve/gve_flow_rule.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/* Google virtual Ethernet (gve) driver
+ *
+ * Copyright (C) 2015-2024 Google LLC
+ */
+
+#include "gve.h"
+#include "gve_adminq.h"
+
+static
+int gve_fill_ethtool_flow_spec(struct ethtool_rx_flow_spec *fsp,
+			       struct gve_adminq_queried_flow_rule *rule)
+{
+	struct gve_adminq_flow_rule *flow_rule = &rule->flow_rule;
+	static const u16 flow_type_lut[] = {
+		[GVE_FLOW_TYPE_TCPV4]	= TCP_V4_FLOW,
+		[GVE_FLOW_TYPE_UDPV4]	= UDP_V4_FLOW,
+		[GVE_FLOW_TYPE_SCTPV4]	= SCTP_V4_FLOW,
+		[GVE_FLOW_TYPE_AHV4]	= AH_V4_FLOW,
+		[GVE_FLOW_TYPE_ESPV4]	= ESP_V4_FLOW,
+		[GVE_FLOW_TYPE_TCPV6]	= TCP_V6_FLOW,
+		[GVE_FLOW_TYPE_UDPV6]	= UDP_V6_FLOW,
+		[GVE_FLOW_TYPE_SCTPV6]	= SCTP_V6_FLOW,
+		[GVE_FLOW_TYPE_AHV6]	= AH_V6_FLOW,
+		[GVE_FLOW_TYPE_ESPV6]	= ESP_V6_FLOW,
+	};
+
+	if (be16_to_cpu(flow_rule->flow_type) >= ARRAY_SIZE(flow_type_lut))
+		return -EINVAL;
+
+	fsp->flow_type = flow_type_lut[be16_to_cpu(flow_rule->flow_type)];
+
+	memset(&fsp->h_u, 0, sizeof(fsp->h_u));
+	memset(&fsp->h_ext, 0, sizeof(fsp->h_ext));
+	memset(&fsp->m_u, 0, sizeof(fsp->m_u));
+	memset(&fsp->m_ext, 0, sizeof(fsp->m_ext));
+
+	switch (fsp->flow_type) {
+	case TCP_V4_FLOW:
+	case UDP_V4_FLOW:
+	case SCTP_V4_FLOW:
+		fsp->h_u.tcp_ip4_spec.ip4src = flow_rule->key.src_ip[0];
+		fsp->h_u.tcp_ip4_spec.ip4dst = flow_rule->key.dst_ip[0];
+		fsp->h_u.tcp_ip4_spec.psrc = flow_rule->key.src_port;
+		fsp->h_u.tcp_ip4_spec.pdst = flow_rule->key.dst_port;
+		fsp->h_u.tcp_ip4_spec.tos = flow_rule->key.tos;
+		fsp->m_u.tcp_ip4_spec.ip4src = flow_rule->mask.src_ip[0];
+		fsp->m_u.tcp_ip4_spec.ip4dst = flow_rule->mask.dst_ip[0];
+		fsp->m_u.tcp_ip4_spec.psrc = flow_rule->mask.src_port;
+		fsp->m_u.tcp_ip4_spec.pdst = flow_rule->mask.dst_port;
+		fsp->m_u.tcp_ip4_spec.tos = flow_rule->mask.tos;
+		break;
+	case AH_V4_FLOW:
+	case ESP_V4_FLOW:
+		fsp->h_u.ah_ip4_spec.ip4src = flow_rule->key.src_ip[0];
+		fsp->h_u.ah_ip4_spec.ip4dst = flow_rule->key.dst_ip[0];
+		fsp->h_u.ah_ip4_spec.spi = flow_rule->key.spi;
+		fsp->h_u.ah_ip4_spec.tos = flow_rule->key.tos;
+		fsp->m_u.ah_ip4_spec.ip4src = flow_rule->mask.src_ip[0];
+		fsp->m_u.ah_ip4_spec.ip4dst = flow_rule->mask.dst_ip[0];
+		fsp->m_u.ah_ip4_spec.spi = flow_rule->mask.spi;
+		fsp->m_u.ah_ip4_spec.tos = flow_rule->mask.tos;
+		break;
+	case TCP_V6_FLOW:
+	case UDP_V6_FLOW:
+	case SCTP_V6_FLOW:
+		memcpy(fsp->h_u.tcp_ip6_spec.ip6src, &flow_rule->key.src_ip,
+		       sizeof(struct in6_addr));
+		memcpy(fsp->h_u.tcp_ip6_spec.ip6dst, &flow_rule->key.dst_ip,
+		       sizeof(struct in6_addr));
+		fsp->h_u.tcp_ip6_spec.psrc = flow_rule->key.src_port;
+		fsp->h_u.tcp_ip6_spec.pdst = flow_rule->key.dst_port;
+		fsp->h_u.tcp_ip6_spec.tclass = flow_rule->key.tclass;
+		memcpy(fsp->m_u.tcp_ip6_spec.ip6src, &flow_rule->mask.src_ip,
+		       sizeof(struct in6_addr));
+		memcpy(fsp->m_u.tcp_ip6_spec.ip6dst, &flow_rule->mask.dst_ip,
+		       sizeof(struct in6_addr));
+		fsp->m_u.tcp_ip6_spec.psrc = flow_rule->mask.src_port;
+		fsp->m_u.tcp_ip6_spec.pdst = flow_rule->mask.dst_port;
+		fsp->m_u.tcp_ip6_spec.tclass = flow_rule->mask.tclass;
+		break;
+	case AH_V6_FLOW:
+	case ESP_V6_FLOW:
+		memcpy(fsp->h_u.ah_ip6_spec.ip6src, &flow_rule->key.src_ip,
+		       sizeof(struct in6_addr));
+		memcpy(fsp->h_u.ah_ip6_spec.ip6dst, &flow_rule->key.dst_ip,
+		       sizeof(struct in6_addr));
+		fsp->h_u.ah_ip6_spec.spi = flow_rule->key.spi;
+		fsp->h_u.ah_ip6_spec.tclass = flow_rule->key.tclass;
+		memcpy(fsp->m_u.ah_ip6_spec.ip6src, &flow_rule->mask.src_ip,
+		       sizeof(struct in6_addr));
+		memcpy(fsp->m_u.ah_ip6_spec.ip6dst, &flow_rule->mask.dst_ip,
+		       sizeof(struct in6_addr));
+		fsp->m_u.ah_ip6_spec.spi = flow_rule->mask.spi;
+		fsp->m_u.ah_ip6_spec.tclass = flow_rule->mask.tclass;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	fsp->ring_cookie = be16_to_cpu(flow_rule->action);
+
+	return 0;
+}
+
+static int gve_generate_flow_rule(struct gve_priv *priv, struct ethtool_rx_flow_spec *fsp,
+				  struct gve_adminq_flow_rule *rule)
+{
+	static const u16 flow_type_lut[] = {
+		[TCP_V4_FLOW]	= GVE_FLOW_TYPE_TCPV4,
+		[UDP_V4_FLOW]	= GVE_FLOW_TYPE_UDPV4,
+		[SCTP_V4_FLOW]	= GVE_FLOW_TYPE_SCTPV4,
+		[AH_V4_FLOW]	= GVE_FLOW_TYPE_AHV4,
+		[ESP_V4_FLOW]	= GVE_FLOW_TYPE_ESPV4,
+		[TCP_V6_FLOW]	= GVE_FLOW_TYPE_TCPV6,
+		[UDP_V6_FLOW]	= GVE_FLOW_TYPE_UDPV6,
+		[SCTP_V6_FLOW]	= GVE_FLOW_TYPE_SCTPV6,
+		[AH_V6_FLOW]	= GVE_FLOW_TYPE_AHV6,
+		[ESP_V6_FLOW]	= GVE_FLOW_TYPE_ESPV6,
+	};
+	u32 flow_type;
+
+	if (fsp->ring_cookie == RX_CLS_FLOW_DISC)
+		return -EOPNOTSUPP;
+
+	if (fsp->ring_cookie >= priv->rx_cfg.num_queues)
+		return -EINVAL;
+
+	rule->action = cpu_to_be16(fsp->ring_cookie);
+
+	flow_type = fsp->flow_type & ~(FLOW_EXT | FLOW_MAC_EXT | FLOW_RSS);
+	if (!flow_type || flow_type >= ARRAY_SIZE(flow_type_lut))
+		return -EINVAL;
+
+	rule->flow_type = cpu_to_be16(flow_type_lut[flow_type]);
+
+	switch (flow_type) {
+	case TCP_V4_FLOW:
+	case UDP_V4_FLOW:
+	case SCTP_V4_FLOW:
+		rule->key.src_ip[0] = fsp->h_u.tcp_ip4_spec.ip4src;
+		rule->key.dst_ip[0] = fsp->h_u.tcp_ip4_spec.ip4dst;
+		rule->key.src_port = fsp->h_u.tcp_ip4_spec.psrc;
+		rule->key.dst_port = fsp->h_u.tcp_ip4_spec.pdst;
+		rule->mask.src_ip[0] = fsp->m_u.tcp_ip4_spec.ip4src;
+		rule->mask.dst_ip[0] = fsp->m_u.tcp_ip4_spec.ip4dst;
+		rule->mask.src_port = fsp->m_u.tcp_ip4_spec.psrc;
+		rule->mask.dst_port = fsp->m_u.tcp_ip4_spec.pdst;
+		break;
+	case AH_V4_FLOW:
+	case ESP_V4_FLOW:
+		rule->key.src_ip[0] = fsp->h_u.tcp_ip4_spec.ip4src;
+		rule->key.dst_ip[0] = fsp->h_u.tcp_ip4_spec.ip4dst;
+		rule->key.spi = fsp->h_u.ah_ip4_spec.spi;
+		rule->mask.src_ip[0] = fsp->m_u.tcp_ip4_spec.ip4src;
+		rule->mask.dst_ip[0] = fsp->m_u.tcp_ip4_spec.ip4dst;
+		rule->mask.spi = fsp->m_u.ah_ip4_spec.spi;
+		break;
+	case TCP_V6_FLOW:
+	case UDP_V6_FLOW:
+	case SCTP_V6_FLOW:
+		memcpy(&rule->key.src_ip, fsp->h_u.tcp_ip6_spec.ip6src,
+		       sizeof(struct in6_addr));
+		memcpy(&rule->key.dst_ip, fsp->h_u.tcp_ip6_spec.ip6dst,
+		       sizeof(struct in6_addr));
+		rule->key.src_port = fsp->h_u.tcp_ip6_spec.psrc;
+		rule->key.dst_port = fsp->h_u.tcp_ip6_spec.pdst;
+		memcpy(&rule->mask.src_ip, fsp->m_u.tcp_ip6_spec.ip6src,
+		       sizeof(struct in6_addr));
+		memcpy(&rule->mask.dst_ip, fsp->m_u.tcp_ip6_spec.ip6dst,
+		       sizeof(struct in6_addr));
+		rule->mask.src_port = fsp->m_u.tcp_ip6_spec.psrc;
+		rule->mask.dst_port = fsp->m_u.tcp_ip6_spec.pdst;
+		break;
+	case AH_V6_FLOW:
+	case ESP_V6_FLOW:
+		memcpy(&rule->key.src_ip, fsp->h_u.usr_ip6_spec.ip6src,
+		       sizeof(struct in6_addr));
+		memcpy(&rule->key.dst_ip, fsp->h_u.usr_ip6_spec.ip6dst,
+		       sizeof(struct in6_addr));
+		rule->key.spi = fsp->h_u.ah_ip6_spec.spi;
+		memcpy(&rule->mask.src_ip, fsp->m_u.usr_ip6_spec.ip6src,
+		       sizeof(struct in6_addr));
+		memcpy(&rule->mask.dst_ip, fsp->m_u.usr_ip6_spec.ip6dst,
+		       sizeof(struct in6_addr));
+		rule->key.spi = fsp->h_u.ah_ip6_spec.spi;
+		break;
+	default:
+		/* not doing un-parsed flow types */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int gve_get_flow_rule_entry(struct gve_priv *priv, struct ethtool_rxnfc *cmd)
+{
+	struct gve_adminq_queried_flow_rule *rules_cache = priv->flow_rules_cache.rules_cache;
+	struct ethtool_rx_flow_spec *fsp = (struct ethtool_rx_flow_spec *)&cmd->fs;
+	u32 *cache_num = &priv->flow_rules_cache.rules_cache_num;
+	struct gve_adminq_queried_flow_rule *rule = NULL;
+	int err = 0;
+	u32 i;
+
+	if (!priv->max_flow_rules)
+		return -EOPNOTSUPP;
+
+	if (!priv->flow_rules_cache.rules_cache_synced ||
+	    fsp->location < be32_to_cpu(rules_cache[0].location) ||
+	    fsp->location > be32_to_cpu(rules_cache[*cache_num - 1].location)) {
+		err = gve_adminq_query_flow_rules(priv, GVE_FLOW_RULE_QUERY_RULES, fsp->location);
+		if (err)
+			return err;
+
+		priv->flow_rules_cache.rules_cache_synced = true;
+	}
+
+	for (i = 0; i < *cache_num; i++) {
+		if (fsp->location == be32_to_cpu(rules_cache[i].location)) {
+			rule = &rules_cache[i];
+			break;
+		}
+	}
+
+	if (!rule)
+		return -EINVAL;
+
+	err = gve_fill_ethtool_flow_spec(fsp, rule);
+
+	return err;
+}
+
+int gve_get_flow_rule_ids(struct gve_priv *priv, struct ethtool_rxnfc *cmd, u32 *rule_locs)
+{
+	__be32 *rule_ids_cache = priv->flow_rules_cache.rule_ids_cache;
+	u32 *cache_num = &priv->flow_rules_cache.rule_ids_cache_num;
+	u32 starting_rule_id = 0;
+	u32 i = 0, j = 0;
+	int err = 0;
+
+	if (!priv->max_flow_rules)
+		return -EOPNOTSUPP;
+
+	do {
+		err = gve_adminq_query_flow_rules(priv, GVE_FLOW_RULE_QUERY_IDS,
+						  starting_rule_id);
+		if (err)
+			return err;
+
+		for (i = 0; i < *cache_num; i++) {
+			if (j >= cmd->rule_cnt)
+				return -EMSGSIZE;
+
+			rule_locs[j++] = be32_to_cpu(rule_ids_cache[i]);
+			starting_rule_id = be32_to_cpu(rule_ids_cache[i]) + 1;
+		}
+	} while (*cache_num != 0);
+	cmd->data = priv->max_flow_rules;
+
+	return err;
+}
+
+int gve_add_flow_rule(struct gve_priv *priv, struct ethtool_rxnfc *cmd)
+{
+	struct ethtool_rx_flow_spec *fsp = &cmd->fs;
+	struct gve_adminq_flow_rule *rule = NULL;
+	int err;
+
+	if (!priv->max_flow_rules)
+		return -EOPNOTSUPP;
+
+	rule = kvzalloc(sizeof(*rule), GFP_KERNEL);
+	if (!rule)
+		return -ENOMEM;
+
+	err = gve_generate_flow_rule(priv, fsp, rule);
+	if (err)
+		goto out;
+
+	err = gve_adminq_add_flow_rule(priv, rule, fsp->location);
+
+out:
+	kvfree(rule);
+	if (err)
+		dev_err(&priv->pdev->dev, "Failed to add the flow rule: %u", fsp->location);
+
+	return err;
+}
+
+int gve_del_flow_rule(struct gve_priv *priv, struct ethtool_rxnfc *cmd)
+{
+	struct ethtool_rx_flow_spec *fsp = (struct ethtool_rx_flow_spec *)&cmd->fs;
+
+	if (!priv->max_flow_rules)
+		return -EOPNOTSUPP;
+
+	return gve_adminq_del_flow_rule(priv, fsp->location);
+}
diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index fc142856e189..9744b426940e 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
 /* Google virtual Ethernet (gve) driver
  *
- * Copyright (C) 2015-2021 Google, Inc.
+ * Copyright (C) 2015-2024 Google LLC
  */
 
 #include <linux/bpf.h>
@@ -635,6 +635,12 @@ static void gve_teardown_device_resources(struct gve_priv *priv)
 
 	/* Tell device its resources are being freed */
 	if (gve_get_device_resources_ok(priv)) {
+		err = gve_flow_rules_reset(priv);
+		if (err) {
+			dev_err(&priv->pdev->dev,
+				"Failed to reset flow rules: err=%d\n", err);
+			gve_trigger_reset(priv);
+		}
 		/* detach the stats report */
 		err = gve_adminq_report_stats(priv, 0, 0x0, GVE_STATS_REPORT_TIMER_PERIOD);
 		if (err) {
@@ -1779,6 +1785,14 @@ static int gve_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 	}
 }
 
+int gve_flow_rules_reset(struct gve_priv *priv)
+{
+	if (!priv->max_flow_rules)
+		return 0;
+
+	return gve_adminq_reset_flow_rules(priv);
+}
+
 int gve_adjust_config(struct gve_priv *priv,
 		      struct gve_tx_alloc_rings_cfg *tx_alloc_cfg,
 		      struct gve_rx_alloc_rings_cfg *rx_alloc_cfg)
@@ -2052,15 +2066,21 @@ static int gve_set_features(struct net_device *netdev,
 		netdev->features ^= NETIF_F_LRO;
 		if (netif_carrier_ok(netdev)) {
 			err = gve_adjust_config(priv, &tx_alloc_cfg, &rx_alloc_cfg);
-			if (err) {
-				/* Revert the change on error. */
-				netdev->features = orig_features;
-				return err;
-			}
+			if (err)
+				goto revert_features;
 		}
 	}
+	if ((netdev->features & NETIF_F_NTUPLE) && !(features & NETIF_F_NTUPLE)) {
+		err = gve_flow_rules_reset(priv);
+		if (err)
+			goto revert_features;
+	}
 
 	return 0;
+
+revert_features:
+	netdev->features = orig_features;
+	return err;
 }
 
 static const struct net_device_ops gve_netdev_ops = {
-- 
2.45.2.627.g7a2c4fd464-goog

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