[PATCH net-next 0/4] mlxsw: Refactor parsing configuration

[PATCH net-next 0/4] mlxsw: Refactor parsing configuration

[Ido Schimmel]

From: Ido Schimmel <idosch@nvidia.com>

The Spectrum ASIC has a configurable limit on how deep into the packet
it parses. By default, the limit is 96 bytes.

There are several cases where this parsing depth is not enough and there
is a need to increase it: Decapsulation of VxLAN packets and
timestamping of PTP packets.

Currently, parsing depth API is maintained as part of VxLAN module,
because the MPRS register which configures parsing depth also configures
UDP destination port number used for VxLAN encapsulation and
decapsulation.

However, in addition to two above mentioned users of this API, the
multipath hash code also needs to invoke it in order to correctly hash
based on inner fields of IPv6-in-IPv6 packets.

Upcoming support for IPv6-in-IPv6 tunneling will add another user, as
without increasing the parsing depth such packets cannot be properly
decapsulated.

Therefore, this patchset refactors the parsing configuration API and
moves it out of the VxLAN module to the main driver code.

Tested using existing selftests.

Patch set overview:

Patch #1 adds the new parsing configuration infrastructure.
Patch #2 converts existing users to the new infrastructure.
Patch #3 deletes the old infrastructure.
Patch #4 calls the new infrastructure from the multipath hash code.

Amit Cohen (4):
  mlxsw: spectrum: Add infrastructure for parsing configuration
  mlxsw: Convert existing consumers to use new API for parsing
    configuration
  mlxsw: Remove old parsing depth infrastructure
  mlxsw: spectrum_router: Increase parsing depth for multipath hash

 .../net/ethernet/mellanox/mlxsw/spectrum.c    | 82 ++++++++++++++++
 .../net/ethernet/mellanox/mlxsw/spectrum.h    | 12 +++
 .../ethernet/mellanox/mlxsw/spectrum_nve.h    |  1 -
 .../mellanox/mlxsw/spectrum_nve_vxlan.c       | 94 ++++---------------
 .../ethernet/mellanox/mlxsw/spectrum_ptp.c    |  4 +-
 .../ethernet/mellanox/mlxsw/spectrum_router.c | 44 ++++++++-
 .../ethernet/mellanox/mlxsw/spectrum_router.h |  1 +
 7 files changed, 160 insertions(+), 78 deletions(-)

-- 
2.31.1

[PATCH net-next 1/4] mlxsw: spectrum: Add infrastructure for parsing configuration

[Ido Schimmel]

From: Amit Cohen <amcohen@nvidia.com>

Spectrum ASICs have a configurable limit on how deep into the packet
they parse. By default, the limit is 96 bytes.

There are several cases where this parsing depth is not enough and there
is a need to increase it. Currently, increasing parsing depth is
maintained as part of VxLAN module, because the MPRS register which
configures parsing depth also configures UDP destination port number
used for VxLAN encapsulation and decapsulation.

Add an API for increasing parsing depth as part of spectrum.c code, so
that it will be possible to use it from other modules. In addition, add
an API for setting UDP destination port and protect it using a dedicated
lock for saving parsing configurations. The lock is needed as not all
the callers hold RTNL lock.

Maintain a counter for increased parsing depth consumers. For first
consumer subscription, increase the parsing depth and for last consumer
unsubscription, set parsing depth to default value.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum.c    | 82 +++++++++++++++++++
 .../net/ethernet/mellanox/mlxsw/spectrum.h    | 12 +++
 2 files changed, 94 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 081408e892d5..250c5a24264d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2717,6 +2717,22 @@ mlxsw_sp_sample_trigger_params_unset(struct mlxsw_sp *mlxsw_sp,
 static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
 				    unsigned long event, void *ptr);
 
+#define MLXSW_SP_DEFAULT_PARSING_DEPTH 96
+#define MLXSW_SP_INCREASED_PARSING_DEPTH 128
+#define MLXSW_SP_DEFAULT_VXLAN_UDP_DPORT 4789
+
+static void mlxsw_sp_parsing_init(struct mlxsw_sp *mlxsw_sp)
+{
+	mlxsw_sp->parsing.parsing_depth = MLXSW_SP_DEFAULT_PARSING_DEPTH;
+	mlxsw_sp->parsing.vxlan_udp_dport = MLXSW_SP_DEFAULT_VXLAN_UDP_DPORT;
+	mutex_init(&mlxsw_sp->parsing.lock);
+}
+
+static void mlxsw_sp_parsing_fini(struct mlxsw_sp *mlxsw_sp)
+{
+	mutex_destroy(&mlxsw_sp->parsing.lock);
+}
+
 static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
 			 const struct mlxsw_bus_info *mlxsw_bus_info,
 			 struct netlink_ext_ack *extack)
@@ -2727,6 +2743,7 @@ static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->core = mlxsw_core;
 	mlxsw_sp->bus_info = mlxsw_bus_info;
 
+	mlxsw_sp_parsing_init(mlxsw_sp);
 	mlxsw_core_emad_string_tlv_enable(mlxsw_core);
 
 	err = mlxsw_sp_base_mac_get(mlxsw_sp);
@@ -2926,6 +2943,7 @@ static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp_fids_fini(mlxsw_sp);
 err_fids_init:
 	mlxsw_sp_kvdl_fini(mlxsw_sp);
+	mlxsw_sp_parsing_fini(mlxsw_sp);
 	return err;
 }
 
@@ -3046,6 +3064,7 @@ static void mlxsw_sp_fini(struct mlxsw_core *mlxsw_core)
 	mlxsw_sp_policers_fini(mlxsw_sp);
 	mlxsw_sp_fids_fini(mlxsw_sp);
 	mlxsw_sp_kvdl_fini(mlxsw_sp);
+	mlxsw_sp_parsing_fini(mlxsw_sp);
 }
 
 /* Per-FID flood tables are used for both "true" 802.1D FIDs and emulated
@@ -3611,6 +3630,69 @@ void mlxsw_sp_port_dev_put(struct mlxsw_sp_port *mlxsw_sp_port)
 	dev_put(mlxsw_sp_port->dev);
 }
 
+int mlxsw_sp_parsing_depth_inc(struct mlxsw_sp *mlxsw_sp)
+{
+	char mprs_pl[MLXSW_REG_MPRS_LEN];
+	int err = 0;
+
+	mutex_lock(&mlxsw_sp->parsing.lock);
+
+	if (refcount_inc_not_zero(&mlxsw_sp->parsing.parsing_depth_ref))
+		goto out_unlock;
+
+	mlxsw_reg_mprs_pack(mprs_pl, MLXSW_SP_INCREASED_PARSING_DEPTH,
+			    mlxsw_sp->parsing.vxlan_udp_dport);
+	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
+	if (err)
+		goto out_unlock;
+
+	mlxsw_sp->parsing.parsing_depth = MLXSW_SP_INCREASED_PARSING_DEPTH;
+	refcount_set(&mlxsw_sp->parsing.parsing_depth_ref, 1);
+
+out_unlock:
+	mutex_unlock(&mlxsw_sp->parsing.lock);
+	return err;
+}
+
+void mlxsw_sp_parsing_depth_dec(struct mlxsw_sp *mlxsw_sp)
+{
+	char mprs_pl[MLXSW_REG_MPRS_LEN];
+
+	mutex_lock(&mlxsw_sp->parsing.lock);
+
+	if (!refcount_dec_and_test(&mlxsw_sp->parsing.parsing_depth_ref))
+		goto out_unlock;
+
+	mlxsw_reg_mprs_pack(mprs_pl, MLXSW_SP_DEFAULT_PARSING_DEPTH,
+			    mlxsw_sp->parsing.vxlan_udp_dport);
+	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
+	mlxsw_sp->parsing.parsing_depth = MLXSW_SP_DEFAULT_PARSING_DEPTH;
+
+out_unlock:
+	mutex_unlock(&mlxsw_sp->parsing.lock);
+}
+
+int mlxsw_sp_parsing_vxlan_udp_dport_set(struct mlxsw_sp *mlxsw_sp,
+					 __be16 udp_dport)
+{
+	char mprs_pl[MLXSW_REG_MPRS_LEN];
+	int err;
+
+	mutex_lock(&mlxsw_sp->parsing.lock);
+
+	mlxsw_reg_mprs_pack(mprs_pl, mlxsw_sp->parsing.parsing_depth,
+			    be16_to_cpu(udp_dport));
+	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
+	if (err)
+		goto out_unlock;
+
+	mlxsw_sp->parsing.vxlan_udp_dport = be16_to_cpu(udp_dport);
+
+out_unlock:
+	mutex_unlock(&mlxsw_sp->parsing.lock);
+	return err;
+}
+
 static void
 mlxsw_sp_port_lag_uppers_cleanup(struct mlxsw_sp_port *mlxsw_sp_port,
 				 struct net_device *lag_dev)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index f99db88ee884..3a43cba6d23c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -148,6 +148,13 @@ struct mlxsw_sp_port_mapping {
 	u8 lane;
 };
 
+struct mlxsw_sp_parsing {
+	refcount_t parsing_depth_ref;
+	u16 parsing_depth;
+	u16 vxlan_udp_dport;
+	struct mutex lock; /* Protects parsing configuration */
+};
+
 struct mlxsw_sp {
 	struct mlxsw_sp_port **ports;
 	struct mlxsw_core *core;
@@ -173,6 +180,7 @@ struct mlxsw_sp {
 	struct mlxsw_sp_counter_pool *counter_pool;
 	struct mlxsw_sp_span *span;
 	struct mlxsw_sp_trap *trap;
+	struct mlxsw_sp_parsing parsing;
 	const struct mlxsw_sp_switchdev_ops *switchdev_ops;
 	const struct mlxsw_sp_kvdl_ops *kvdl_ops;
 	const struct mlxsw_afa_ops *afa_ops;
@@ -652,6 +660,10 @@ struct mlxsw_sp_port *mlxsw_sp_port_dev_lower_find(struct net_device *dev);
 struct mlxsw_sp_port *mlxsw_sp_port_lower_dev_hold(struct net_device *dev);
 void mlxsw_sp_port_dev_put(struct mlxsw_sp_port *mlxsw_sp_port);
 struct mlxsw_sp_port *mlxsw_sp_port_dev_lower_find_rcu(struct net_device *dev);
+int mlxsw_sp_parsing_depth_inc(struct mlxsw_sp *mlxsw_sp);
+void mlxsw_sp_parsing_depth_dec(struct mlxsw_sp *mlxsw_sp);
+int mlxsw_sp_parsing_vxlan_udp_dport_set(struct mlxsw_sp *mlxsw_sp,
+					 __be16 udp_dport);
 
 /* spectrum_dcb.c */
 #ifdef CONFIG_MLXSW_SPECTRUM_DCB
-- 
2.31.1

[PATCH net-next 2/4] mlxsw: Convert existing consumers to use new API for parsing configuration

[Ido Schimmel]

From: Amit Cohen <amcohen@nvidia.com>

Convert VxLAN and PTP modules to increase parsing depth using new API
that was added in the previous patch.

Separate MPRS register's configuration to VxLAN related configuration
and parsing depth configuration. Handle each one using the appropriate
API.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
 .../mellanox/mlxsw/spectrum_nve_vxlan.c       | 26 ++++++++++++++-----
 .../ethernet/mellanox/mlxsw/spectrum_ptp.c    |  4 +--
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
index b84bb4b65098..c722ac370fb6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
@@ -238,10 +238,14 @@ static int mlxsw_sp1_nve_vxlan_init(struct mlxsw_sp_nve *nve,
 	struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
 	int err;
 
-	err = __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, config->udp_dport);
+	err = mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, config->udp_dport);
 	if (err)
 		return err;
 
+	err = mlxsw_sp_parsing_depth_inc(mlxsw_sp);
+	if (err)
+		goto err_parsing_depth_inc;
+
 	err = mlxsw_sp1_nve_vxlan_config_set(mlxsw_sp, config);
 	if (err)
 		goto err_config_set;
@@ -263,7 +267,9 @@ static int mlxsw_sp1_nve_vxlan_init(struct mlxsw_sp_nve *nve,
 err_rtdp_set:
 	mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp);
 err_config_set:
-	__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
+	mlxsw_sp_parsing_depth_dec(mlxsw_sp);
+err_parsing_depth_inc:
+	mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, 0);
 	return err;
 }
 
@@ -275,7 +281,8 @@ static void mlxsw_sp1_nve_vxlan_fini(struct mlxsw_sp_nve *nve)
 	mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id,
 					 config->ul_proto, &config->ul_sip);
 	mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp);
-	__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
+	mlxsw_sp_parsing_depth_dec(mlxsw_sp);
+	mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, 0);
 }
 
 static int
@@ -412,10 +419,14 @@ static int mlxsw_sp2_nve_vxlan_init(struct mlxsw_sp_nve *nve,
 	struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
 	int err;
 
-	err = __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, config->udp_dport);
+	err = mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, config->udp_dport);
 	if (err)
 		return err;
 
+	err = mlxsw_sp_parsing_depth_inc(mlxsw_sp);
+	if (err)
+		goto err_parsing_depth_inc;
+
 	err = mlxsw_sp2_nve_vxlan_config_set(mlxsw_sp, config);
 	if (err)
 		goto err_config_set;
@@ -438,7 +449,9 @@ static int mlxsw_sp2_nve_vxlan_init(struct mlxsw_sp_nve *nve,
 err_rtdp_set:
 	mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
 err_config_set:
-	__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
+	mlxsw_sp_parsing_depth_dec(mlxsw_sp);
+err_parsing_depth_inc:
+	mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, 0);
 	return err;
 }
 
@@ -450,7 +463,8 @@ static void mlxsw_sp2_nve_vxlan_fini(struct mlxsw_sp_nve *nve)
 	mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id,
 					 config->ul_proto, &config->ul_sip);
 	mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
-	__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
+	mlxsw_sp_parsing_depth_dec(mlxsw_sp);
+	mlxsw_sp_parsing_vxlan_udp_dport_set(mlxsw_sp, 0);
 }
 
 const struct mlxsw_sp_nve_ops mlxsw_sp2_nve_vxlan_ops = {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
index bfef65d1587c..1a180384e7e8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
@@ -975,14 +975,14 @@ static int mlxsw_sp1_ptp_mtpppc_update(struct mlxsw_sp_port *mlxsw_sp_port,
 	}
 
 	if ((ing_types || egr_types) && !(orig_ing_types || orig_egr_types)) {
-		err = mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp);
+		err = mlxsw_sp_parsing_depth_inc(mlxsw_sp);
 		if (err) {
 			netdev_err(mlxsw_sp_port->dev, "Failed to increase parsing depth");
 			return err;
 		}
 	}
 	if (!(ing_types || egr_types) && (orig_ing_types || orig_egr_types))
-		mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp);
+		mlxsw_sp_parsing_depth_dec(mlxsw_sp);
 
 	return mlxsw_sp1_ptp_mtpppc_set(mlxsw_sp_port->mlxsw_sp,
 				       ing_types, egr_types);
-- 
2.31.1

[PATCH net-next 3/4] mlxsw: Remove old parsing depth infrastructure

[Ido Schimmel]

From: Amit Cohen <amcohen@nvidia.com>

The previous patches added new API to handle parsing depth and converted
the existing code to use it.

Remove the old infrastructure which is not needed anymore.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_nve.h    |  1 -
 .../mellanox/mlxsw/spectrum_nve_vxlan.c       | 68 -------------------
 2 files changed, 69 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h
index d8104fc6c900..98d1fdc25eac 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h
@@ -29,7 +29,6 @@ struct mlxsw_sp_nve {
 	unsigned int num_max_mc_entries[MLXSW_SP_L3_PROTO_MAX];
 	u32 tunnel_index;
 	u16 ul_rif_index;	/* Reserved for Spectrum */
-	unsigned int inc_parsing_depth_refs;
 };
 
 struct mlxsw_sp_nve_ops {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
index c722ac370fb6..d018d2da5949 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
@@ -10,14 +10,6 @@
 #include "spectrum.h"
 #include "spectrum_nve.h"
 
-/* Eth (18B) | IPv6 (40B) | UDP (8B) | VxLAN (8B) | Eth (14B) | IPv6 (40B)
- *
- * In the worst case - where we have a VLAN tag on the outer Ethernet
- * header and IPv6 in overlay and underlay - we need to parse 128 bytes
- */
-#define MLXSW_SP_NVE_VXLAN_PARSING_DEPTH 128
-#define MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH 96
-
 #define MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS	(VXLAN_F_UDP_ZERO_CSUM_TX | \
 						 VXLAN_F_LEARN)
 
@@ -115,66 +107,6 @@ static void mlxsw_sp_nve_vxlan_config(const struct mlxsw_sp_nve *nve,
 	config->udp_dport = cfg->dst_port;
 }
 
-static int __mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
-				      unsigned int parsing_depth,
-				      __be16 udp_dport)
-{
-	char mprs_pl[MLXSW_REG_MPRS_LEN];
-
-	mlxsw_reg_mprs_pack(mprs_pl, parsing_depth, be16_to_cpu(udp_dport));
-	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
-}
-
-static int mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
-				    __be16 udp_dport)
-{
-	int parsing_depth = mlxsw_sp->nve->inc_parsing_depth_refs ?
-				MLXSW_SP_NVE_VXLAN_PARSING_DEPTH :
-				MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH;
-
-	return __mlxsw_sp_nve_parsing_set(mlxsw_sp, parsing_depth, udp_dport);
-}
-
-static int
-__mlxsw_sp_nve_inc_parsing_depth_get(struct mlxsw_sp *mlxsw_sp,
-				     __be16 udp_dport)
-{
-	int err;
-
-	mlxsw_sp->nve->inc_parsing_depth_refs++;
-
-	err = mlxsw_sp_nve_parsing_set(mlxsw_sp, udp_dport);
-	if (err)
-		goto err_nve_parsing_set;
-	return 0;
-
-err_nve_parsing_set:
-	mlxsw_sp->nve->inc_parsing_depth_refs--;
-	return err;
-}
-
-static void
-__mlxsw_sp_nve_inc_parsing_depth_put(struct mlxsw_sp *mlxsw_sp,
-				     __be16 udp_dport)
-{
-	mlxsw_sp->nve->inc_parsing_depth_refs--;
-	mlxsw_sp_nve_parsing_set(mlxsw_sp, udp_dport);
-}
-
-int mlxsw_sp_nve_inc_parsing_depth_get(struct mlxsw_sp *mlxsw_sp)
-{
-	__be16 udp_dport = mlxsw_sp->nve->config.udp_dport;
-
-	return __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, udp_dport);
-}
-
-void mlxsw_sp_nve_inc_parsing_depth_put(struct mlxsw_sp *mlxsw_sp)
-{
-	__be16 udp_dport = mlxsw_sp->nve->config.udp_dport;
-
-	__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, udp_dport);
-}
-
 static void
 mlxsw_sp_nve_vxlan_config_prepare(char *tngcr_pl,
 				  const struct mlxsw_sp_nve_config *config)
-- 
2.31.1

[PATCH net-next 4/4] mlxsw: spectrum_router: Increase parsing depth for multipath hash

[Ido Schimmel]

From: Amit Cohen <amcohen@nvidia.com>

Commit 01848e05f8bb ("mlxsw: spectrum_router: Add support for inner
layer 3 multipath hash policy") and commit daeabf89eb89 ("mlxsw:
spectrum_router: Add support for custom multipath hash policy") added
support for multipath hash policies where the hash is calculated based
on inner packet fields.

For IPv6-in-IPv6 packets, the default parsing depth (96 bytes) is not
enough when these policies are used.

Therefore, for such cases, call the new API to increase / decrease the
parsing depth as necessary. Care is taken to ensure the API is not
called multiple times.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_router.c | 44 ++++++++++++++++++-
 .../ethernet/mellanox/mlxsw/spectrum_router.h |  1 +
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index f69cbb3852d5..19bb3ca0515e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -9484,6 +9484,7 @@ struct mlxsw_sp_mp_hash_config {
 	DECLARE_BITMAP(fields, __MLXSW_REG_RECR2_FIELD_CNT);
 	DECLARE_BITMAP(inner_headers, __MLXSW_REG_RECR2_HEADER_CNT);
 	DECLARE_BITMAP(inner_fields, __MLXSW_REG_RECR2_INNER_FIELD_CNT);
+	bool inc_parsing_depth;
 };
 
 #define MLXSW_SP_MP_HASH_HEADER_SET(_headers, _header) \
@@ -9654,6 +9655,7 @@ static void mlxsw_sp_mp6_hash_init(struct mlxsw_sp *mlxsw_sp,
 		MLXSW_SP_MP_HASH_FIELD_SET(fields, IPV6_FLOW_LABEL);
 		/* Inner */
 		mlxsw_sp_mp_hash_inner_l3(config);
+		config->inc_parsing_depth = true;
 		break;
 	case 3:
 		/* Outer */
@@ -9678,22 +9680,53 @@ static void mlxsw_sp_mp6_hash_init(struct mlxsw_sp *mlxsw_sp,
 			MLXSW_SP_MP_HASH_FIELD_SET(fields, TCP_UDP_DPORT);
 		/* Inner */
 		mlxsw_sp_mp_hash_inner_custom(config, hash_fields);
+		if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
+			config->inc_parsing_depth = true;
 		break;
 	}
 }
 
+static int mlxsw_sp_mp_hash_parsing_depth_adjust(struct mlxsw_sp *mlxsw_sp,
+						 bool old_inc_parsing_depth,
+						 bool new_inc_parsing_depth)
+{
+	int err;
+
+	if (!old_inc_parsing_depth && new_inc_parsing_depth) {
+		err = mlxsw_sp_parsing_depth_inc(mlxsw_sp);
+		if (err)
+			return err;
+		mlxsw_sp->router->inc_parsing_depth = true;
+	} else if (old_inc_parsing_depth && !new_inc_parsing_depth) {
+		mlxsw_sp_parsing_depth_dec(mlxsw_sp);
+		mlxsw_sp->router->inc_parsing_depth = false;
+	}
+
+	return 0;
+}
+
 static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
 {
+	bool old_inc_parsing_depth, new_inc_parsing_depth;
 	struct mlxsw_sp_mp_hash_config config = {};
 	char recr2_pl[MLXSW_REG_RECR2_LEN];
 	unsigned long bit;
 	u32 seed;
+	int err;
 
 	seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
 	mlxsw_reg_recr2_pack(recr2_pl, seed);
 	mlxsw_sp_mp4_hash_init(mlxsw_sp, &config);
 	mlxsw_sp_mp6_hash_init(mlxsw_sp, &config);
 
+	old_inc_parsing_depth = mlxsw_sp->router->inc_parsing_depth;
+	new_inc_parsing_depth = config.inc_parsing_depth;
+	err = mlxsw_sp_mp_hash_parsing_depth_adjust(mlxsw_sp,
+						    old_inc_parsing_depth,
+						    new_inc_parsing_depth);
+	if (err)
+		return err;
+
 	for_each_set_bit(bit, config.headers, __MLXSW_REG_RECR2_HEADER_CNT)
 		mlxsw_reg_recr2_outer_header_enables_set(recr2_pl, bit, 1);
 	for_each_set_bit(bit, config.fields, __MLXSW_REG_RECR2_FIELD_CNT)
@@ -9703,7 +9736,16 @@ static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
 	for_each_set_bit(bit, config.inner_fields, __MLXSW_REG_RECR2_INNER_FIELD_CNT)
 		mlxsw_reg_recr2_inner_header_fields_enable_set(recr2_pl, bit, 1);
 
-	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(recr2), recr2_pl);
+	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(recr2), recr2_pl);
+	if (err)
+		goto err_reg_write;
+
+	return 0;
+
+err_reg_write:
+	mlxsw_sp_mp_hash_parsing_depth_adjust(mlxsw_sp, new_inc_parsing_depth,
+					      old_inc_parsing_depth);
+	return err;
 }
 #else
 static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
index c5d7007f9173..25d3eae63501 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -81,6 +81,7 @@ struct mlxsw_sp_router {
 	size_t adj_grp_size_ranges_count;
 	struct delayed_work nh_grp_activity_dw;
 	struct list_head nh_res_grp_list;
+	bool inc_parsing_depth;
 };
 
 struct mlxsw_sp_fib_entry_priv {
-- 
2.31.1

Re: [PATCH net-next 0/4] mlxsw: Refactor parsing configuration

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Sun, 22 Aug 2021 14:37:12 +0300 you wrote:
> From: Ido Schimmel <idosch@nvidia.com>
> 
> The Spectrum ASIC has a configurable limit on how deep into the packet
> it parses. By default, the limit is 96 bytes.
> 
> There are several cases where this parsing depth is not enough and there
> is a need to increase it: Decapsulation of VxLAN packets and
> timestamping of PTP packets.
> 
> [...]

Here is the summary with links:
  - [net-next,1/4] mlxsw: spectrum: Add infrastructure for parsing configuration
    https://git.kernel.org/netdev/net-next/c/2d91f0803b84
  - [net-next,2/4] mlxsw: Convert existing consumers to use new API for parsing configuration
    https://git.kernel.org/netdev/net-next/c/0071e7cdc386
  - [net-next,3/4] mlxsw: Remove old parsing depth infrastructure
    https://git.kernel.org/netdev/net-next/c/c3d2ed93b14d
  - [net-next,4/4] mlxsw: spectrum_router: Increase parsing depth for multipath hash
    https://git.kernel.org/netdev/net-next/c/43c1b83305fa

You are awesome, thank you!
--
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