[patch net-next 00/21] mlxsw: Offloading GRE tunnels

[patch net-next 00/21] mlxsw: Offloading GRE tunnels

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Petr says:

This patch series introduces to mlxsw driver support for offloading
IP-in-IP tunnels in general, and for (subset of) GRE in particular.

This patchset supports two ways of configuring GRE:

- So called "hierarchical configuration", where the GRE device has a bound
  dummy device, which is in a different VRF. The VRF with host traffic is
  called "overlay", the one with encapsulated traffic is called "underlay".

- So called "flat configuration", where the GRE device doesn't have a bound
  device, and overlay and underlay are both in the same VRF (possibly the
  default one).

Two routes are then interesting: a route that directs traffic to a GRE
device (which would typically be in overlay VRF, but could be in another
one), and a local route for the tunnel's local address (in underlay).
Handling of these two route types is then introduced as patches to support,
respectively, IPv4 and IPv6 encapsulation and IPv4 decapsulation.

The encap and decap routes then reference a loopback device, a new type of
RIF introduced by this patchset for the specific use of offloading tunnels.

The encap and decap code is abstract with respect to the particulars of
individual L3 tunnel types. This patchset introduces support for GRE
tunnels in particular.

Limitations:
- Each tunnel needs to have a different local address (within a given VRF).
  When two tunnels are used that are in conflict, FIB abort is triggered
  and the driver ceases offloading FIBs. Full handling of such
  configurations needs special setup in the hardware, such that the tunnels
  that share an address are dispatched correctly according to their key (or
  lack thereof). That's currently not implemented, and to keep things
  deterministic, the driver triggers FIB abort.

- A next hop that uses an incompletely-specified tunnel (e.g. such that are
  used for LWT) is not offloaded, but doesn't trigger FIB abort like the
  above. If such routes end up being in a de facto conflict with other
  tunnels, then if there already is an offload for that address, the
  traffic for the conflicting tunnel will end up mismatching the
  configuration of the offloaded tunnel, and thus gets to slow path through
  an error trap.

- GRE checksumming and sequence numbers are not supported and TTL and TOS
  need to be set to inherit. Tunnels with a different configuration are not
  offloaded and their traffic is trapping to slow path.

  Note in particular that TOS of inherit is not the default configuration
  and needs to be explicitly specified when the tunnel is created.

- The only feature that is not graciously handled is that if a change is
  made to the tunnel, e.g. through "ip tunnel change", such changes are not
  reflected in the driver. There is currently no notification mechanism for
  these changes. Introduction of this mechanism and its leverage in the
  driver will be subject of follow-up work. For now this limitation can be
  worked around by removing and re-adding the encap route.

Petr Machata (21):
  mlxsw: reg: Update RITR to support loopback device
  mlxsw: reg: Update RATR to support IP-in-IP tunnels
  mlxsw: reg: Move enum mlxsw_reg_ratr_trap_id
  mlxsw: reg: Add mlxsw_reg_ralue_act_ip2me_tun_pack()
  mlxsw: reg: Extract mlxsw_reg_ritr_mac_pack()
  mlxsw: reg: Give mlxsw_reg_ratr_pack a type parameter
  mlxsw: spectrum_router: Publish mlxsw_sp_l3proto
  mlxsw: spectrum_router: Add mlxsw_sp_ipip_ops
  mlxsw: spectrum_router: Support FID-less RIFs
  mlxsw: spectrum_router: Introduce loopback RIFs
  mlxsw: spectrum_router: Extract mlxsw_sp_fi_is_gateway()
  mlxsw: spectrum_router: Extract mlxsw_sp_rt6_is_gateway()
  mlxsw: spectrum_router: Make nexthops typed
  mlxsw: spectrum_router: Support IPv4 overlay encap
  mlxsw: spectrum_router: Support IPv6 overlay encap
  mlxsw: spectrum_router: Support IPv4 underlay decap
  mlxsw: spectrum_router: Use existing decap route
  mlxsw: spectrum: Register for IPIP_DECAP_ERROR trap
  mlxsw: spectrum_router: Add loopback accessors
  mlxsw: spectrum_router: Support GRE tunnels
  mlxsw: reg: Add Routing Tunnel Decap Properties Register

 drivers/net/ethernet/mellanox/mlxsw/Makefile       |   4 +-
 drivers/net/ethernet/mellanox/mlxsw/reg.h          | 311 ++++++-
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c     |   1 +
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |   1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.c    | 214 +++++
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.h    |  79 ++
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 947 +++++++++++++++++++--
 .../net/ethernet/mellanox/mlxsw/spectrum_router.h  |  28 +
 drivers/net/ethernet/mellanox/mlxsw/trap.h         |   1 +
 9 files changed, 1485 insertions(+), 101 deletions(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
 create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h

-- 
2.9.3

[patch net-next 01/21] mlxsw: reg: Update RITR to support loopback device

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Update the register so that loopback RIFs can be created and loopback
properties specified.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 88 +++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 11e290c..8736f8492 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -3998,6 +3998,8 @@ enum mlxsw_reg_ritr_if_type {
 	MLXSW_REG_RITR_FID_IF,
 	/* Sub-port interface. */
 	MLXSW_REG_RITR_SP_IF,
+	/* Loopback Interface. */
+	MLXSW_REG_RITR_LOOPBACK_IF,
 };
 
 /* reg_ritr_type
@@ -4129,6 +4131,67 @@ MLXSW_ITEM32(reg, ritr, sp_if_system_port, 0x08, 0, 16);
  */
 MLXSW_ITEM32(reg, ritr, sp_if_vid, 0x18, 0, 12);
 
+/* Loopback Interface */
+
+enum mlxsw_reg_ritr_loopback_protocol {
+	/* IPinIP IPv4 underlay Unicast */
+	MLXSW_REG_RITR_LOOPBACK_PROTOCOL_IPIP_IPV4,
+	/* IPinIP IPv6 underlay Unicast */
+	MLXSW_REG_RITR_LOOPBACK_PROTOCOL_IPIP_IPV6,
+};
+
+/* reg_ritr_loopback_protocol
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, loopback_protocol, 0x08, 28, 4);
+
+enum mlxsw_reg_ritr_loopback_ipip_type {
+	/* Tunnel is IPinIP. */
+	MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_IP,
+	/* Tunnel is GRE, no key. */
+	MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP,
+	/* Tunnel is GRE, with a key. */
+	MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP,
+};
+
+/* reg_ritr_loopback_ipip_type
+ * Encapsulation type.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, loopback_ipip_type, 0x10, 24, 4);
+
+enum mlxsw_reg_ritr_loopback_ipip_options {
+	/* The key is defined by gre_key. */
+	MLXSW_REG_RITR_LOOPBACK_IPIP_OPTIONS_GRE_KEY_PRESET,
+};
+
+/* reg_ritr_loopback_ipip_options
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, loopback_ipip_options, 0x10, 20, 4);
+
+/* reg_ritr_loopback_ipip_uvr
+ * Underlay Virtual Router ID.
+ * Range is 0..cap_max_virtual_routers-1.
+ * Reserved for Spectrum-2.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, loopback_ipip_uvr, 0x10, 0, 16);
+
+/* reg_ritr_loopback_ipip_usip*
+ * Encapsulation Underlay source IP.
+ * Access: RW
+ */
+MLXSW_ITEM_BUF(reg, ritr, loopback_ipip_usip6, 0x18, 16);
+MLXSW_ITEM32(reg, ritr, loopback_ipip_usip4, 0x24, 0, 32);
+
+/* reg_ritr_loopback_ipip_gre_key
+ * GRE Key.
+ * Reserved when ipip_type is not IP_IN_GRE_KEY_IN_IP.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, loopback_ipip_gre_key, 0x28, 0, 32);
+
 /* Shared between ingress/egress */
 enum mlxsw_reg_ritr_counter_set_type {
 	/* No Count. */
@@ -4219,6 +4282,31 @@ static inline void mlxsw_reg_ritr_pack(char *payload, bool enable,
 	mlxsw_reg_ritr_if_mac_memcpy_to(payload, mac);
 }
 
+static inline void
+mlxsw_reg_ritr_loopback_ipip_common_pack(char *payload,
+			    enum mlxsw_reg_ritr_loopback_ipip_type ipip_type,
+			    enum mlxsw_reg_ritr_loopback_ipip_options options,
+			    u16 uvr_id, u32 gre_key)
+{
+	mlxsw_reg_ritr_loopback_ipip_type_set(payload, ipip_type);
+	mlxsw_reg_ritr_loopback_ipip_options_set(payload, options);
+	mlxsw_reg_ritr_loopback_ipip_uvr_set(payload, uvr_id);
+	mlxsw_reg_ritr_loopback_ipip_gre_key_set(payload, gre_key);
+}
+
+static inline void
+mlxsw_reg_ritr_loopback_ipip4_pack(char *payload,
+			    enum mlxsw_reg_ritr_loopback_ipip_type ipip_type,
+			    enum mlxsw_reg_ritr_loopback_ipip_options options,
+			    u16 uvr_id, u32 usip, u32 gre_key)
+{
+	mlxsw_reg_ritr_loopback_protocol_set(payload,
+				    MLXSW_REG_RITR_LOOPBACK_PROTOCOL_IPIP_IPV4);
+	mlxsw_reg_ritr_loopback_ipip_common_pack(payload, ipip_type, options,
+						 uvr_id, gre_key);
+	mlxsw_reg_ritr_loopback_ipip_usip4_set(payload, usip);
+}
+
 /* RATR - Router Adjacency Table Register
  * --------------------------------------
  * The RATR register is used to configure the Router Adjacency (next-hop)
-- 
2.9.3

[patch net-next 02/21] mlxsw: reg: Update RATR to support IP-in-IP tunnels

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

So far, adjacencies have always been of type Ethernet (with value of 0),
and thus there was no need to explicitly support RATR type. However to
support IP-in-IP adjacencies, this type and a suite of IP-in-IP-specific
attributes need to be added.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 66 +++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 8736f8492..6a7757f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -4362,6 +4362,38 @@ MLXSW_ITEM32(reg, ratr, v, 0x00, 24, 1);
  */
 MLXSW_ITEM32(reg, ratr, a, 0x00, 16, 1);
 
+enum mlxsw_reg_ratr_type {
+	/* Ethernet */
+	MLXSW_REG_RATR_TYPE_ETHERNET,
+	/* IPoIB Unicast without GRH.
+	 * Reserved for Spectrum.
+	 */
+	MLXSW_REG_RATR_TYPE_IPOIB_UC,
+	/* IPoIB Unicast with GRH. Supported only in table 0 (Ethernet unicast
+	 * adjacency).
+	 * Reserved for Spectrum.
+	 */
+	MLXSW_REG_RATR_TYPE_IPOIB_UC_W_GRH,
+	/* IPoIB Multicast.
+	 * Reserved for Spectrum.
+	 */
+	MLXSW_REG_RATR_TYPE_IPOIB_MC,
+	/* MPLS.
+	 * Reserved for SwitchX/-2.
+	 */
+	MLXSW_REG_RATR_TYPE_MPLS,
+	/* IPinIP Encap.
+	 * Reserved for SwitchX/-2.
+	 */
+	MLXSW_REG_RATR_TYPE_IPIP,
+};
+
+/* reg_ratr_type
+ * Adjacency entry type.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ratr, type, 0x04, 28, 4);
+
 /* reg_ratr_adjacency_index_low
  * Bits 15:0 of index into the adjacency table.
  * For SwitchX and SwitchX-2, the adjacency table is linear and
@@ -4416,6 +4448,34 @@ MLXSW_ITEM32(reg, ratr, trap_id, 0x0C, 0, 8);
  */
 MLXSW_ITEM_BUF(reg, ratr, eth_destination_mac, 0x12, 6);
 
+enum mlxsw_reg_ratr_ipip_type {
+	/* IPv4, address set by mlxsw_reg_ratr_ipip_ipv4_udip. */
+	MLXSW_REG_RATR_IPIP_TYPE_IPV4,
+	/* IPv6, address set by mlxsw_reg_ratr_ipip_ipv6_ptr. */
+	MLXSW_REG_RATR_IPIP_TYPE_IPV6,
+};
+
+/* reg_ratr_ipip_type
+ * Underlay destination ip type.
+ * Note: the type field must match the protocol of the router interface.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ratr, ipip_type, 0x10, 16, 4);
+
+/* reg_ratr_ipip_ipv4_udip
+ * Underlay ipv4 dip.
+ * Reserved when ipip_type is IPv6.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ratr, ipip_ipv4_udip, 0x18, 0, 32);
+
+/* reg_ratr_ipip_ipv6_ptr
+ * Pointer to IPv6 underlay destination ip address.
+ * For Spectrum: Pointer to KVD linear space.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ratr, ipip_ipv6_ptr, 0x1C, 0, 24);
+
 static inline void
 mlxsw_reg_ratr_pack(char *payload,
 		    enum mlxsw_reg_ratr_op op, bool valid,
@@ -4435,6 +4495,12 @@ static inline void mlxsw_reg_ratr_eth_entry_pack(char *payload,
 	mlxsw_reg_ratr_eth_destination_mac_memcpy_to(payload, dest_mac);
 }
 
+static inline void mlxsw_reg_ratr_ipip4_entry_pack(char *payload, u32 ipv4_udip)
+{
+	mlxsw_reg_ratr_ipip_type_set(payload, MLXSW_REG_RATR_IPIP_TYPE_IPV4);
+	mlxsw_reg_ratr_ipip_ipv4_udip_set(payload, ipv4_udip);
+}
+
 /* RICNT - Router Interface Counter Register
  * -----------------------------------------
  * The RICNT register retrieves per port performance counters
-- 
2.9.3

[patch net-next 03/21] mlxsw: reg: Move enum mlxsw_reg_ratr_trap_id

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

This enum is used with reg_ratr_trap_id, so move it next to the register
definition.

While at it, drop the enumerator initializers.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 6a7757f..bf936b6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -4423,17 +4423,17 @@ enum mlxsw_reg_ratr_trap_action {
  */
 MLXSW_ITEM32(reg, ratr, trap_action, 0x0C, 28, 4);
 
-enum mlxsw_reg_ratr_trap_id {
-	MLXSW_REG_RATR_TRAP_ID_RTR_EGRESS0 = 0,
-	MLXSW_REG_RATR_TRAP_ID_RTR_EGRESS1 = 1,
-};
-
 /* reg_ratr_adjacency_index_high
  * Bits 23:16 of the adjacency_index.
  * Access: Index
  */
 MLXSW_ITEM32(reg, ratr, adjacency_index_high, 0x0C, 16, 8);
 
+enum mlxsw_reg_ratr_trap_id {
+	MLXSW_REG_RATR_TRAP_ID_RTR_EGRESS0,
+	MLXSW_REG_RATR_TRAP_ID_RTR_EGRESS1,
+};
+
 /* reg_ratr_trap_id
  * Trap ID to be reported to CPU.
  * Trap-ID is RTR_EGRESS0 or RTR_EGRESS1.
-- 
2.9.3

[patch net-next 04/21] mlxsw: reg: Add mlxsw_reg_ralue_act_ip2me_tun_pack()

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

To implement IP-in-IP decapsulation, Spectrum uses LPM entries of type
IP2ME with tunnel validity bit and tunnel pointer set. The necessary
register fields are already available, so add a function to pack the
RALUE as appropriate.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index bf936b6..24296cf 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -5054,6 +5054,15 @@ mlxsw_reg_ralue_act_ip2me_pack(char *payload)
 					MLXSW_REG_RALUE_ACTION_TYPE_IP2ME);
 }
 
+static inline void
+mlxsw_reg_ralue_act_ip2me_tun_pack(char *payload, u32 tunnel_ptr)
+{
+	mlxsw_reg_ralue_action_type_set(payload,
+					MLXSW_REG_RALUE_ACTION_TYPE_IP2ME);
+	mlxsw_reg_ralue_ip2me_v_set(payload, 1);
+	mlxsw_reg_ralue_ip2me_tunnel_ptr_set(payload, tunnel_ptr);
+}
+
 /* RAUHT - Router Algorithmic LPM Unicast Host Table Register
  * ----------------------------------------------------------
  * The RAUHT register is used to configure and query the Unicast Host table in
-- 
2.9.3

[patch net-next 05/21] mlxsw: reg: Extract mlxsw_reg_ritr_mac_pack()

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Unlike other interface types, loopback RIFs do not have MAC address. So
drop the corresponding argument from mlxsw_reg_ritr_pack() and move it
to a new function. Call that from callers of mlxsw_reg_ritr_pack.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h             | 7 +++++--
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 7 ++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 24296cf..27a378d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -4262,8 +4262,7 @@ static inline void mlxsw_reg_ritr_sp_if_pack(char *payload, bool lag,
 
 static inline void mlxsw_reg_ritr_pack(char *payload, bool enable,
 				       enum mlxsw_reg_ritr_if_type type,
-				       u16 rif, u16 vr_id, u16 mtu,
-				       const char *mac)
+				       u16 rif, u16 vr_id, u16 mtu)
 {
 	bool op = enable ? MLXSW_REG_RITR_RIF_CREATE : MLXSW_REG_RITR_RIF_DEL;
 
@@ -4279,6 +4278,10 @@ static inline void mlxsw_reg_ritr_pack(char *payload, bool enable,
 	mlxsw_reg_ritr_lb_en_set(payload, 1);
 	mlxsw_reg_ritr_virtual_router_set(payload, vr_id);
 	mlxsw_reg_ritr_mtu_set(payload, mtu);
+}
+
+static inline void mlxsw_reg_ritr_mac_pack(char *payload, const char *mac)
+{
 	mlxsw_reg_ritr_if_mac_memcpy_to(payload, mac);
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index de15eac..3ddfbe3 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -4955,8 +4955,8 @@ static int mlxsw_sp_rif_subport_op(struct mlxsw_sp_rif *rif, bool enable)
 
 	rif_subport = mlxsw_sp_rif_subport_rif(rif);
 	mlxsw_reg_ritr_pack(ritr_pl, enable, MLXSW_REG_RITR_SP_IF,
-			    rif->rif_index, rif->vr_id, rif->dev->mtu,
-			    rif->dev->dev_addr);
+			    rif->rif_index, rif->vr_id, rif->dev->mtu);
+	mlxsw_reg_ritr_mac_pack(ritr_pl, rif->dev->dev_addr);
 	mlxsw_reg_ritr_sp_if_pack(ritr_pl, rif_subport->lag,
 				  rif_subport->lag ? rif_subport->lag_id :
 						     rif_subport->system_port,
@@ -4998,7 +4998,8 @@ static int mlxsw_sp_rif_vlan_fid_op(struct mlxsw_sp_rif *rif,
 	char ritr_pl[MLXSW_REG_RITR_LEN];
 
 	mlxsw_reg_ritr_pack(ritr_pl, enable, type, rif->rif_index, rif->vr_id,
-			    rif->dev->mtu, rif->dev->dev_addr);
+			    rif->dev->mtu);
+	mlxsw_reg_ritr_mac_pack(ritr_pl, rif->dev->dev_addr);
 	mlxsw_reg_ritr_fid_set(ritr_pl, type, vid_fid);
 
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ritr), ritr_pl);
-- 
2.9.3

[patch net-next 06/21] mlxsw: reg: Give mlxsw_reg_ratr_pack a type parameter

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

To support IPIP, the driver needs to be able to construct an IPIP
adjacency. Change mlxsw_reg_ratr_pack to take an adjacency type as an
argument. Adjust the one existing caller.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h             | 2 ++
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 27a378d..680bc7e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -4482,11 +4482,13 @@ MLXSW_ITEM32(reg, ratr, ipip_ipv6_ptr, 0x1C, 0, 24);
 static inline void
 mlxsw_reg_ratr_pack(char *payload,
 		    enum mlxsw_reg_ratr_op op, bool valid,
+		    enum mlxsw_reg_ratr_type type,
 		    u32 adjacency_index, u16 egress_rif)
 {
 	MLXSW_REG_ZERO(ratr, payload);
 	mlxsw_reg_ratr_op_set(payload, op);
 	mlxsw_reg_ratr_v_set(payload, valid);
+	mlxsw_reg_ratr_type_set(payload, type);
 	mlxsw_reg_ratr_adjacency_index_low_set(payload, adjacency_index);
 	mlxsw_reg_ratr_adjacency_index_high_set(payload, adjacency_index >> 16);
 	mlxsw_reg_ratr_egress_router_interface_set(payload, egress_rif);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 3ddfbe3..4e47d45 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1928,7 +1928,8 @@ static int mlxsw_sp_nexthop_mac_update(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 	char ratr_pl[MLXSW_REG_RATR_LEN];
 
 	mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
-			    true, adj_index, neigh_entry->rif);
+			    true, MLXSW_REG_RATR_TYPE_ETHERNET,
+			    adj_index, neigh_entry->rif);
 	mlxsw_reg_ratr_eth_entry_pack(ratr_pl, neigh_entry->ha);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 }
-- 
2.9.3

[patch net-next 07/21] mlxsw: spectrum_router: Publish mlxsw_sp_l3proto

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

The spectrum_ipip module that will be introduced in the follow-up
patches needs to know the data type.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 5 -----
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h | 5 +++++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 4e47d45..f866ac5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -405,11 +405,6 @@ struct mlxsw_sp_rt6 {
 	struct rt6_info *rt;
 };
 
-enum mlxsw_sp_l3proto {
-	MLXSW_SP_L3_PROTO_IPV4,
-	MLXSW_SP_L3_PROTO_IPV6,
-};
-
 struct mlxsw_sp_lpm_tree {
 	u8 id; /* tree ID */
 	unsigned int ref_count;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
index 87a04af..67c6c1d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -37,6 +37,11 @@
 
 #include "spectrum.h"
 
+enum mlxsw_sp_l3proto {
+	MLXSW_SP_L3_PROTO_IPV4,
+	MLXSW_SP_L3_PROTO_IPV6,
+};
+
 enum mlxsw_sp_rif_counter_dir {
 	MLXSW_SP_RIF_COUNTER_INGRESS,
 	MLXSW_SP_RIF_COUNTER_EGRESS,
-- 
2.9.3

[patch net-next 08/21] mlxsw: spectrum_router: Add mlxsw_sp_ipip_ops

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Details of individual tunnel types are kept in an array of
mlxsw_sp_ipip_ops objects. Follow-up patches will use the list to
determine whether a constructed RIF should be a loopback, and to decide
whether a next hop references a tunnel.

The list is currently empty, follow-up patches will add support for GRE.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/Makefile       |  4 +-
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.c    | 38 ++++++++++++++++
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.h    | 51 ++++++++++++++++++++++
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 19 ++++++++
 4 files changed, 110 insertions(+), 2 deletions(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
 create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h

diff --git a/drivers/net/ethernet/mellanox/mlxsw/Makefile b/drivers/net/ethernet/mellanox/mlxsw/Makefile
index f9956f3..891ff41 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/Makefile
+++ b/drivers/net/ethernet/mellanox/mlxsw/Makefile
@@ -16,8 +16,8 @@ mlxsw_spectrum-objs		:= spectrum.o spectrum_buffers.o \
 				   spectrum_switchdev.o spectrum_router.o \
 				   spectrum_kvdl.o spectrum_acl_tcam.o \
 				   spectrum_acl.o spectrum_flower.o \
-				   spectrum_cnt.o \
-				   spectrum_fid.o
+				   spectrum_cnt.o spectrum_fid.o \
+				   spectrum_ipip.o
 mlxsw_spectrum-$(CONFIG_MLXSW_SPECTRUM_DCB)	+= spectrum_dcb.o
 mlxsw_spectrum-$(CONFIG_NET_DEVLINK) += spectrum_dpipe.o
 obj-$(CONFIG_MLXSW_MINIMAL)	+= mlxsw_minimal.o
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
new file mode 100644
index 0000000..20b0b96
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
@@ -0,0 +1,38 @@
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "spectrum_ipip.h"
+
+const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
+};
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
new file mode 100644
index 0000000..65eb493
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
@@ -0,0 +1,51 @@
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MLXSW_IPIP_H_
+#define _MLXSW_IPIP_H_
+
+#include "spectrum_router.h"
+
+enum mlxsw_sp_ipip_type {
+	MLXSW_SP_IPIP_TYPE_MAX,
+};
+
+struct mlxsw_sp_ipip_ops {
+	int dev_type;
+	enum mlxsw_sp_l3proto ul_proto; /* Underlay. */
+};
+
+extern const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[];
+
+#endif /* _MLXSW_IPIP_H_*/
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index f866ac5..f85d249 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -62,6 +62,7 @@
 #include "reg.h"
 #include "spectrum_cnt.h"
 #include "spectrum_dpipe.h"
+#include "spectrum_ipip.h"
 #include "spectrum_router.h"
 
 struct mlxsw_sp_vr;
@@ -89,6 +90,7 @@ struct mlxsw_sp_router {
 	bool aborted;
 	struct notifier_block fib_nb;
 	const struct mlxsw_sp_rif_ops **rif_ops_arr;
+	const struct mlxsw_sp_ipip_ops **ipip_ops_arr;
 };
 
 struct mlxsw_sp_rif {
@@ -5152,6 +5154,16 @@ static void mlxsw_sp_rifs_fini(struct mlxsw_sp *mlxsw_sp)
 	kfree(mlxsw_sp->router->rifs);
 }
 
+static int mlxsw_sp_ipips_init(struct mlxsw_sp *mlxsw_sp)
+{
+	mlxsw_sp->router->ipip_ops_arr = mlxsw_sp_ipip_ops_arr;
+	return 0;
+}
+
+static void mlxsw_sp_ipips_fini(struct mlxsw_sp *mlxsw_sp)
+{
+}
+
 static void mlxsw_sp_router_fib_dump_flush(struct notifier_block *nb)
 {
 	struct mlxsw_sp_router *router;
@@ -5211,6 +5223,10 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
 	if (err)
 		goto err_rifs_init;
 
+	err = mlxsw_sp_ipips_init(mlxsw_sp);
+	if (err)
+		goto err_ipips_init;
+
 	err = rhashtable_init(&mlxsw_sp->router->nexthop_ht,
 			      &mlxsw_sp_nexthop_ht_params);
 	if (err)
@@ -5252,6 +5268,8 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
 err_nexthop_group_ht_init:
 	rhashtable_destroy(&mlxsw_sp->router->nexthop_ht);
 err_nexthop_ht_init:
+	mlxsw_sp_ipips_fini(mlxsw_sp);
+err_ipips_init:
 	mlxsw_sp_rifs_fini(mlxsw_sp);
 err_rifs_init:
 	__mlxsw_sp_router_fini(mlxsw_sp);
@@ -5268,6 +5286,7 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 	mlxsw_sp_lpm_fini(mlxsw_sp);
 	rhashtable_destroy(&mlxsw_sp->router->nexthop_group_ht);
 	rhashtable_destroy(&mlxsw_sp->router->nexthop_ht);
+	mlxsw_sp_ipips_fini(mlxsw_sp);
 	mlxsw_sp_rifs_fini(mlxsw_sp);
 	__mlxsw_sp_router_fini(mlxsw_sp);
 	kfree(mlxsw_sp->router);
-- 
2.9.3

[patch net-next 09/21] mlxsw: spectrum_router: Support FID-less RIFs

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Loopback RIFs, which will be introduced in a follow-up patch, differ
from other RIFs in that they do not have a FID associated with them.

To support this, demote FID allocation from mlxsw_sp_rif_create to
configure op of the existing RIF types, and likewise the FID release
from mlxsw_sp_rif_destroy to deconfigure op.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 85 ++++++++++++++++------
 1 file changed, 63 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index f85d249..38477c5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -4444,9 +4444,9 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 {
 	u32 tb_id = l3mdev_fib_table(params->dev);
 	const struct mlxsw_sp_rif_ops *ops;
+	struct mlxsw_sp_fid *fid = NULL;
 	enum mlxsw_sp_rif_type type;
 	struct mlxsw_sp_rif *rif;
-	struct mlxsw_sp_fid *fid;
 	struct mlxsw_sp_vr *vr;
 	u16 rif_index;
 	int err;
@@ -4470,12 +4470,14 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	rif->mlxsw_sp = mlxsw_sp;
 	rif->ops = ops;
 
-	fid = ops->fid_get(rif);
-	if (IS_ERR(fid)) {
-		err = PTR_ERR(fid);
-		goto err_fid_get;
+	if (ops->fid_get) {
+		fid = ops->fid_get(rif);
+		if (IS_ERR(fid)) {
+			err = PTR_ERR(fid);
+			goto err_fid_get;
+		}
+		rif->fid = fid;
 	}
-	rif->fid = fid;
 
 	if (ops->setup)
 		ops->setup(rif, params);
@@ -4484,22 +4486,15 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_configure;
 
-	err = mlxsw_sp_rif_fdb_op(mlxsw_sp, params->dev->dev_addr,
-				  mlxsw_sp_fid_index(fid), true);
-	if (err)
-		goto err_rif_fdb_op;
-
 	mlxsw_sp_rif_counters_alloc(rif);
-	mlxsw_sp_fid_rif_set(fid, rif);
 	mlxsw_sp->router->rifs[rif_index] = rif;
 	vr->rif_count++;
 
 	return rif;
 
-err_rif_fdb_op:
-	ops->deconfigure(rif);
 err_configure:
-	mlxsw_sp_fid_put(fid);
+	if (fid)
+		mlxsw_sp_fid_put(fid);
 err_fid_get:
 	kfree(rif);
 err_rif_alloc:
@@ -4520,12 +4515,11 @@ void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif)
 
 	vr->rif_count--;
 	mlxsw_sp->router->rifs[rif->rif_index] = NULL;
-	mlxsw_sp_fid_rif_set(fid, NULL);
 	mlxsw_sp_rif_counters_free(rif);
-	mlxsw_sp_rif_fdb_op(mlxsw_sp, rif->dev->dev_addr,
-			    mlxsw_sp_fid_index(fid), false);
 	ops->deconfigure(rif);
-	mlxsw_sp_fid_put(fid);
+	if (fid)
+		/* Loopback RIFs are not associated with a FID. */
+		mlxsw_sp_fid_put(fid);
 	kfree(rif);
 	mlxsw_sp_vr_put(vr);
 }
@@ -4965,11 +4959,32 @@ static int mlxsw_sp_rif_subport_op(struct mlxsw_sp_rif *rif, bool enable)
 
 static int mlxsw_sp_rif_subport_configure(struct mlxsw_sp_rif *rif)
 {
-	return mlxsw_sp_rif_subport_op(rif, true);
+	int err;
+
+	err = mlxsw_sp_rif_subport_op(rif, true);
+	if (err)
+		return err;
+
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
+	return 0;
+
+err_rif_fdb_op:
+	mlxsw_sp_rif_subport_op(rif, false);
+	return err;
 }
 
 static void mlxsw_sp_rif_subport_deconfigure(struct mlxsw_sp_rif *rif)
 {
+	struct mlxsw_sp_fid *fid = rif->fid;
+
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_rif_subport_op(rif, false);
 }
 
@@ -5028,8 +5043,17 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		goto err_fid_bc_flood_set;
 
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
 	return 0;
 
+err_rif_fdb_op:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 err_fid_bc_flood_set:
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
@@ -5040,9 +5064,13 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 
 static void mlxsw_sp_rif_vlan_deconfigure(struct mlxsw_sp_rif *rif)
 {
-	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
 	u16 vid = mlxsw_sp_fid_8021q_vid(rif->fid);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_fid *fid = rif->fid;
 
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
@@ -5087,8 +5115,17 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		goto err_fid_bc_flood_set;
 
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
 	return 0;
 
+err_rif_fdb_op:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 err_fid_bc_flood_set:
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
@@ -5099,9 +5136,13 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 
 static void mlxsw_sp_rif_fid_deconfigure(struct mlxsw_sp_rif *rif)
 {
-	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
 	u16 fid_index = mlxsw_sp_fid_index(rif->fid);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_fid *fid = rif->fid;
 
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
-- 
2.9.3

[patch net-next 10/21] mlxsw: spectrum_router: Introduce loopback RIFs

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

When offloading L3 tunnels, an adjacency entry is created that loops the
packet back into the underlay router. Loopback interfaces then hold the
corresponding information and are created for IP-in-IP netdevices.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |   1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 152 ++++++++++++++++++++-
 .../net/ethernet/mellanox/mlxsw/spectrum_router.h  |  13 ++
 3 files changed, 164 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index f8c7f7e..84ce83a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -77,6 +77,7 @@ enum mlxsw_sp_rif_type {
 	MLXSW_SP_RIF_TYPE_SUBPORT,
 	MLXSW_SP_RIF_TYPE_VLAN,
 	MLXSW_SP_RIF_TYPE_FID,
+	MLXSW_SP_RIF_TYPE_IPIP_LB, /* IP-in-IP loopback. */
 	MLXSW_SP_RIF_TYPE_MAX,
 };
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 38477c5..72e386b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1,9 +1,10 @@
 /*
  * drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
- * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016-2017 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  * Copyright (c) 2016 Ido Schimmel <idosch@mellanox.com>
  * Copyright (c) 2016 Yotam Gigi <yotamg@mellanox.com>
+ * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -51,6 +52,7 @@
 #include <net/ip_fib.h>
 #include <net/ip6_fib.h>
 #include <net/fib_rules.h>
+#include <net/ip_tunnels.h>
 #include <net/l3mdev.h>
 #include <net/addrconf.h>
 #include <net/ndisc.h>
@@ -131,6 +133,17 @@ struct mlxsw_sp_rif_subport {
 	bool lag;
 };
 
+struct mlxsw_sp_rif_ipip_lb {
+	struct mlxsw_sp_rif common;
+	struct mlxsw_sp_rif_ipip_lb_config lb_config;
+	u16 ul_vr_id; /* Reserved for Spectrum-2. */
+};
+
+struct mlxsw_sp_rif_params_ipip_lb {
+	struct mlxsw_sp_rif_params common;
+	struct mlxsw_sp_rif_ipip_lb_config lb_config;
+};
+
 struct mlxsw_sp_rif_ops {
 	enum mlxsw_sp_rif_type type;
 	size_t rif_size;
@@ -883,6 +896,25 @@ static void mlxsw_sp_vrs_fini(struct mlxsw_sp *mlxsw_sp)
 	kfree(mlxsw_sp->router->vrs);
 }
 
+static struct net_device *
+__mlxsw_sp_ipip_netdev_ul_dev_get(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+	struct net *net = dev_net(ol_dev);
+
+	return __dev_get_by_index(net, tun->parms.link);
+}
+
+static u32 mlxsw_sp_ipip_dev_ul_tb_id(const struct net_device *ol_dev)
+{
+	struct net_device *d = __mlxsw_sp_ipip_netdev_ul_dev_get(ol_dev);
+
+	if (d)
+		return l3mdev_fib_table(d) ? : RT_TABLE_MAIN;
+	else
+		return l3mdev_fib_table(ol_dev) ? : RT_TABLE_MAIN;
+}
+
 struct mlxsw_sp_neigh_key {
 	struct neighbour *n;
 };
@@ -2236,6 +2268,25 @@ static void mlxsw_sp_nexthop_neigh_fini(struct mlxsw_sp *mlxsw_sp,
 	neigh_release(n);
 }
 
+static bool mlxsw_sp_netdev_ipip_type(const struct mlxsw_sp *mlxsw_sp,
+				      const struct net_device *dev,
+				      enum mlxsw_sp_ipip_type *p_type)
+{
+	struct mlxsw_sp_router *router = mlxsw_sp->router;
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
+	enum mlxsw_sp_ipip_type ipipt;
+
+	for (ipipt = 0; ipipt < MLXSW_SP_IPIP_TYPE_MAX; ++ipipt) {
+		ipip_ops = router->ipip_ops_arr[ipipt];
+		if (dev->type == ipip_ops->dev_type) {
+			if (p_type)
+				*p_type = ipipt;
+			return true;
+		}
+	}
+	return false;
+}
+
 static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 				  struct mlxsw_sp_nexthop_group *nh_grp,
 				  struct mlxsw_sp_nexthop *nh,
@@ -4374,7 +4425,10 @@ mlxsw_sp_dev_rif_type(const struct mlxsw_sp *mlxsw_sp,
 {
 	enum mlxsw_sp_fid_type type;
 
-	/* RIF type is derived from the type of the underlying FID */
+	if (mlxsw_sp_netdev_ipip_type(mlxsw_sp, dev, NULL))
+		return MLXSW_SP_RIF_TYPE_IPIP_LB;
+
+	/* Otherwise RIF type is derived from the type of the underlying FID. */
 	if (is_vlan_dev(dev) && netif_is_bridge_master(vlan_dev_real_dev(dev)))
 		type = MLXSW_SP_FID_TYPE_8021Q;
 	else if (netif_is_bridge_master(dev) && br_vlan_enabled(dev))
@@ -5164,10 +5218,104 @@ static const struct mlxsw_sp_rif_ops mlxsw_sp_rif_fid_ops = {
 	.fid_get		= mlxsw_sp_rif_fid_fid_get,
 };
 
+static struct mlxsw_sp_rif_ipip_lb *
+mlxsw_sp_rif_ipip_lb_rif(struct mlxsw_sp_rif *rif)
+{
+	return container_of(rif, struct mlxsw_sp_rif_ipip_lb, common);
+}
+
+static void
+mlxsw_sp_rif_ipip_lb_setup(struct mlxsw_sp_rif *rif,
+			   const struct mlxsw_sp_rif_params *params)
+{
+	struct mlxsw_sp_rif_params_ipip_lb *params_lb;
+	struct mlxsw_sp_rif_ipip_lb *rif_lb;
+
+	params_lb = container_of(params, struct mlxsw_sp_rif_params_ipip_lb,
+				 common);
+	rif_lb = mlxsw_sp_rif_ipip_lb_rif(rif);
+	rif_lb->lb_config = params_lb->lb_config;
+}
+
+static int
+mlxsw_sp_rif_ipip_lb_op(struct mlxsw_sp_rif_ipip_lb *lb_rif,
+			struct mlxsw_sp_vr *ul_vr, bool enable)
+{
+	struct mlxsw_sp_rif_ipip_lb_config lb_cf = lb_rif->lb_config;
+	struct mlxsw_sp_rif *rif = &lb_rif->common;
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	char ritr_pl[MLXSW_REG_RITR_LEN];
+	u32 saddr4;
+
+	switch (lb_cf.ul_protocol) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		saddr4 = be32_to_cpu(lb_cf.saddr.addr4);
+		mlxsw_reg_ritr_pack(ritr_pl, enable, MLXSW_REG_RITR_LOOPBACK_IF,
+				    rif->rif_index, rif->vr_id, rif->dev->mtu);
+		mlxsw_reg_ritr_loopback_ipip4_pack(ritr_pl, lb_cf.lb_ipipt,
+			    MLXSW_REG_RITR_LOOPBACK_IPIP_OPTIONS_GRE_KEY_PRESET,
+			    ul_vr->id, saddr4, lb_cf.okey);
+		break;
+
+	case MLXSW_SP_L3_PROTO_IPV6:
+		return -EAFNOSUPPORT;
+	}
+
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ritr), ritr_pl);
+}
+
+static int
+mlxsw_sp_rif_ipip_lb_configure(struct mlxsw_sp_rif *rif)
+{
+	struct mlxsw_sp_rif_ipip_lb *lb_rif = mlxsw_sp_rif_ipip_lb_rif(rif);
+	u32 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(rif->dev);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_vr *ul_vr;
+	int err;
+
+	ul_vr = mlxsw_sp_vr_get(mlxsw_sp, ul_tb_id);
+	if (IS_ERR(ul_vr))
+		return PTR_ERR(ul_vr);
+
+	err = mlxsw_sp_rif_ipip_lb_op(lb_rif, ul_vr, true);
+	if (err)
+		goto err_loopback_op;
+
+	lb_rif->ul_vr_id = ul_vr->id;
+	++ul_vr->rif_count;
+	return 0;
+
+err_loopback_op:
+	mlxsw_sp_vr_put(ul_vr);
+	return err;
+}
+
+static void mlxsw_sp_rif_ipip_lb_deconfigure(struct mlxsw_sp_rif *rif)
+{
+	struct mlxsw_sp_rif_ipip_lb *lb_rif = mlxsw_sp_rif_ipip_lb_rif(rif);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_vr *ul_vr;
+
+	ul_vr = &mlxsw_sp->router->vrs[lb_rif->ul_vr_id];
+	mlxsw_sp_rif_ipip_lb_op(lb_rif, ul_vr, false);
+
+	--ul_vr->rif_count;
+	mlxsw_sp_vr_put(ul_vr);
+}
+
+static const struct mlxsw_sp_rif_ops mlxsw_sp_rif_ipip_lb_ops = {
+	.type			= MLXSW_SP_RIF_TYPE_IPIP_LB,
+	.rif_size		= sizeof(struct mlxsw_sp_rif_ipip_lb),
+	.setup                  = mlxsw_sp_rif_ipip_lb_setup,
+	.configure		= mlxsw_sp_rif_ipip_lb_configure,
+	.deconfigure		= mlxsw_sp_rif_ipip_lb_deconfigure,
+};
+
 static const struct mlxsw_sp_rif_ops *mlxsw_sp_rif_ops_arr[] = {
 	[MLXSW_SP_RIF_TYPE_SUBPORT]	= &mlxsw_sp_rif_subport_ops,
 	[MLXSW_SP_RIF_TYPE_VLAN]	= &mlxsw_sp_rif_vlan_ops,
 	[MLXSW_SP_RIF_TYPE_FID]		= &mlxsw_sp_rif_fid_ops,
+	[MLXSW_SP_RIF_TYPE_IPIP_LB]	= &mlxsw_sp_rif_ipip_lb_ops,
 };
 
 static int mlxsw_sp_rifs_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 67c6c1d..a5732aa 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -36,12 +36,25 @@
 #define _MLXSW_ROUTER_H_
 
 #include "spectrum.h"
+#include "reg.h"
 
 enum mlxsw_sp_l3proto {
 	MLXSW_SP_L3_PROTO_IPV4,
 	MLXSW_SP_L3_PROTO_IPV6,
 };
 
+union mlxsw_sp_l3addr {
+	__be32 addr4;
+	struct in6_addr addr6;
+};
+
+struct mlxsw_sp_rif_ipip_lb_config {
+	enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
+	u32 okey;
+	enum mlxsw_sp_l3proto ul_protocol; /* Underlay. */
+	union mlxsw_sp_l3addr saddr;
+};
+
 enum mlxsw_sp_rif_counter_dir {
 	MLXSW_SP_RIF_COUNTER_INGRESS,
 	MLXSW_SP_RIF_COUNTER_EGRESS,
-- 
2.9.3

[patch net-next 11/21] mlxsw: spectrum_router: Extract mlxsw_sp_fi_is_gateway()

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

For IPv4 IP-in-IP offload, routes that direct traffic to IP-in-IP
devices need to be considered gateway routes as well. That involves a
bit more logic, so extract the current test to a separate function,
where the logic can be later added.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 72e386b..04e1887 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -2382,6 +2382,12 @@ static void mlxsw_sp_nexthop_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
 	}
 }
 
+static bool mlxsw_sp_fi_is_gateway(const struct mlxsw_sp *mlxsw_sp,
+				   const struct fib_info *fi)
+{
+	return fi->fib_nh->nh_scope == RT_SCOPE_LINK;
+}
+
 static struct mlxsw_sp_nexthop_group *
 mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi)
 {
@@ -2401,7 +2407,7 @@ mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi)
 	INIT_LIST_HEAD(&nh_grp->fib_list);
 	nh_grp->neigh_tbl = &arp_tbl;
 
-	nh_grp->gateway = fi->fib_nh->nh_scope == RT_SCOPE_LINK;
+	nh_grp->gateway = mlxsw_sp_fi_is_gateway(mlxsw_sp, fi);
 	nh_grp->count = fi->fib_nhs;
 	fib_info_hold(fi);
 	for (i = 0; i < nh_grp->count; i++) {
@@ -2801,10 +2807,10 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp,
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
 		return 0;
 	case RTN_UNICAST:
-		if (fi->fib_nh->nh_scope != RT_SCOPE_LINK)
-			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
-		else
+		if (mlxsw_sp_fi_is_gateway(mlxsw_sp, fi))
 			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_REMOTE;
+		else
+			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
 		return 0;
 	default:
 		return -EINVAL;
-- 
2.9.3

[patch net-next 12/21] mlxsw: spectrum_router: Extract mlxsw_sp_rt6_is_gateway()

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

IPv6 counterpart of the previous patch: introduce a function to
determine whether a given route is a gateway route.

The new function takes a mlxsw_sp argument which follow-up patches will
use. Thus mlxsw_sp_fib6_entry_type_set() got that argument as well.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 04e1887..563e803 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3526,6 +3526,12 @@ static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_nexthop_rif_fini(nh);
 }
 
+static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp,
+				    const struct rt6_info *rt)
+{
+	return rt->rt6i_flags & RTF_GATEWAY;
+}
+
 static struct mlxsw_sp_nexthop_group *
 mlxsw_sp_nexthop6_group_create(struct mlxsw_sp *mlxsw_sp,
 			       struct mlxsw_sp_fib6_entry *fib6_entry)
@@ -3548,7 +3554,7 @@ mlxsw_sp_nexthop6_group_create(struct mlxsw_sp *mlxsw_sp,
 #endif
 	mlxsw_sp_rt6 = list_first_entry(&fib6_entry->rt6_list,
 					struct mlxsw_sp_rt6, list);
-	nh_grp->gateway = !!(mlxsw_sp_rt6->rt->rt6i_flags & RTF_GATEWAY);
+	nh_grp->gateway = mlxsw_sp_rt6_is_gateway(mlxsw_sp, mlxsw_sp_rt6->rt);
 	nh_grp->count = fib6_entry->nrt6;
 	for (i = 0; i < nh_grp->count; i++) {
 		struct rt6_info *rt = mlxsw_sp_rt6->rt;
@@ -3705,7 +3711,8 @@ mlxsw_sp_fib6_entry_nexthop_del(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_rt6_destroy(mlxsw_sp_rt6);
 }
 
-static void mlxsw_sp_fib6_entry_type_set(struct mlxsw_sp_fib_entry *fib_entry,
+static void mlxsw_sp_fib6_entry_type_set(struct mlxsw_sp *mlxsw_sp,
+					 struct mlxsw_sp_fib_entry *fib_entry,
 					 const struct rt6_info *rt)
 {
 	/* Packets hitting RTF_REJECT routes need to be discarded by the
@@ -3718,7 +3725,7 @@ static void mlxsw_sp_fib6_entry_type_set(struct mlxsw_sp_fib_entry *fib_entry,
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
 	else if (rt->rt6i_flags & RTF_REJECT)
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
-	else if (rt->rt6i_flags & RTF_GATEWAY)
+	else if (mlxsw_sp_rt6_is_gateway(mlxsw_sp, rt))
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_REMOTE;
 	else
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
@@ -3758,7 +3765,7 @@ mlxsw_sp_fib6_entry_create(struct mlxsw_sp *mlxsw_sp,
 		goto err_rt6_create;
 	}
 
-	mlxsw_sp_fib6_entry_type_set(fib_entry, mlxsw_sp_rt6->rt);
+	mlxsw_sp_fib6_entry_type_set(mlxsw_sp, fib_entry, mlxsw_sp_rt6->rt);
 
 	INIT_LIST_HEAD(&fib6_entry->rt6_list);
 	list_add_tail(&mlxsw_sp_rt6->list, &fib6_entry->rt6_list);
-- 
2.9.3

[patch net-next 13/21] mlxsw: spectrum_router: Make nexthops typed

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

In the router, some next hops may reference an encapsulating netdevice,
such as GRE or IPIP. To properly offload these next hops, mlxsw needs to
keep track of whether a given next hop is a regular Ethernet entry, or
an IP-in-IP tunneling entry.

To facilitate this book-keeping, add a type field to struct
mlxsw_sp_nexthop. There is, as of this patch, only one next hop type:
MLXSW_SP_NEXTHOP_TYPE_ETH. Follow-up patches will introduce the IP-in-IP
variant.

There are several places where next hops are initialized in the IPv4
path. Instead of replicating the logic at every one of them, factor it
out to a function mlxsw_sp_nexthop4_type_init(). The corresponding fini
is actually protocol-neutral, so put it to mlxsw_sp_nexthop_type_fini(),
but create a corresponding protocoled _fini function that dispatches to
the protocol-neutral one.

The IPv6 path is simpler, but for symmetry with IPv4, create the same
suite of functions with corresponding logic.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 138 ++++++++++++++-------
 1 file changed, 95 insertions(+), 43 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 563e803..53bdd0f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1652,6 +1652,10 @@ static void mlxsw_sp_neigh_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
 	}
 }
 
+enum mlxsw_sp_nexthop_type {
+	MLXSW_SP_NEXTHOP_TYPE_ETH,
+};
+
 struct mlxsw_sp_nexthop_key {
 	struct fib_nh *fib_nh;
 };
@@ -1676,7 +1680,10 @@ struct mlxsw_sp_nexthop {
 	   update:1; /* set indicates that MAC of this neigh should be
 		      * updated in HW
 		      */
-	struct mlxsw_sp_neigh_entry *neigh_entry;
+	enum mlxsw_sp_nexthop_type type;
+	union {
+		struct mlxsw_sp_neigh_entry *neigh_entry;
+	};
 };
 
 struct mlxsw_sp_nexthop_group {
@@ -1964,9 +1971,9 @@ static int mlxsw_sp_nexthop_mac_update(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 }
 
 static int
-mlxsw_sp_nexthop_group_mac_update(struct mlxsw_sp *mlxsw_sp,
-				  struct mlxsw_sp_nexthop_group *nh_grp,
-				  bool reallocate)
+mlxsw_sp_nexthop_group_update(struct mlxsw_sp *mlxsw_sp,
+			      struct mlxsw_sp_nexthop_group *nh_grp,
+			      bool reallocate)
 {
 	u32 adj_index = nh_grp->adj_index; /* base */
 	struct mlxsw_sp_nexthop *nh;
@@ -1982,8 +1989,12 @@ mlxsw_sp_nexthop_group_mac_update(struct mlxsw_sp *mlxsw_sp,
 		}
 
 		if (nh->update || reallocate) {
-			err = mlxsw_sp_nexthop_mac_update(mlxsw_sp,
-							  adj_index, nh);
+			switch (nh->type) {
+			case MLXSW_SP_NEXTHOP_TYPE_ETH:
+				err = mlxsw_sp_nexthop_mac_update
+					    (mlxsw_sp, adj_index, nh);
+				break;
+			}
 			if (err)
 				return err;
 			nh->update = 0;
@@ -2071,8 +2082,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 		/* Nothing was added or removed, so no need to reallocate. Just
 		 * update MAC on existing adjacency indexes.
 		 */
-		err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp,
-							false);
+		err = mlxsw_sp_nexthop_group_update(mlxsw_sp, nh_grp, false);
 		if (err) {
 			dev_warn(mlxsw_sp->bus_info->dev, "Failed to update neigh MAC in adjacency table.\n");
 			goto set_trap;
@@ -2099,7 +2109,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 	nh_grp->adj_index_valid = 1;
 	nh_grp->adj_index = adj_index;
 	nh_grp->ecmp_size = ecmp_size;
-	err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp, true);
+	err = mlxsw_sp_nexthop_group_update(mlxsw_sp, nh_grp, true);
 	if (err) {
 		dev_warn(mlxsw_sp->bus_info->dev, "Failed to update neigh MAC in adjacency table.\n");
 		goto set_trap;
@@ -2287,6 +2297,48 @@ static bool mlxsw_sp_netdev_ipip_type(const struct mlxsw_sp *mlxsw_sp,
 	return false;
 }
 
+static void mlxsw_sp_nexthop_type_fini(struct mlxsw_sp *mlxsw_sp,
+				       struct mlxsw_sp_nexthop *nh)
+{
+	switch (nh->type) {
+	case MLXSW_SP_NEXTHOP_TYPE_ETH:
+		mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
+		mlxsw_sp_nexthop_rif_fini(nh);
+		break;
+	}
+}
+
+static int mlxsw_sp_nexthop4_type_init(struct mlxsw_sp *mlxsw_sp,
+				       struct mlxsw_sp_nexthop *nh,
+				       struct fib_nh *fib_nh)
+{
+	struct net_device *dev = fib_nh->nh_dev;
+	struct mlxsw_sp_rif *rif;
+	int err;
+
+	nh->type = MLXSW_SP_NEXTHOP_TYPE_ETH;
+	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
+	if (!rif)
+		return 0;
+
+	mlxsw_sp_nexthop_rif_init(nh, rif);
+	err = mlxsw_sp_nexthop_neigh_init(mlxsw_sp, nh);
+	if (err)
+		goto err_neigh_init;
+
+	return 0;
+
+err_neigh_init:
+	mlxsw_sp_nexthop_rif_fini(nh);
+	return err;
+}
+
+static void mlxsw_sp_nexthop4_type_fini(struct mlxsw_sp *mlxsw_sp,
+					struct mlxsw_sp_nexthop *nh)
+{
+	mlxsw_sp_nexthop_type_fini(mlxsw_sp, nh);
+}
+
 static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 				  struct mlxsw_sp_nexthop_group *nh_grp,
 				  struct mlxsw_sp_nexthop *nh,
@@ -2294,7 +2346,6 @@ static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 {
 	struct net_device *dev = fib_nh->nh_dev;
 	struct in_device *in_dev;
-	struct mlxsw_sp_rif *rif;
 	int err;
 
 	nh->nh_grp = nh_grp;
@@ -2312,19 +2363,13 @@ static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 	    fib_nh->nh_flags & RTNH_F_LINKDOWN)
 		return 0;
 
-	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
-	if (!rif)
-		return 0;
-	mlxsw_sp_nexthop_rif_init(nh, rif);
-
-	err = mlxsw_sp_nexthop_neigh_init(mlxsw_sp, nh);
+	err = mlxsw_sp_nexthop4_type_init(mlxsw_sp, nh, fib_nh);
 	if (err)
 		goto err_nexthop_neigh_init;
 
 	return 0;
 
 err_nexthop_neigh_init:
-	mlxsw_sp_nexthop_rif_fini(nh);
 	mlxsw_sp_nexthop_remove(mlxsw_sp, nh);
 	return err;
 }
@@ -2332,8 +2377,7 @@ static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 static void mlxsw_sp_nexthop4_fini(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_nexthop *nh)
 {
-	mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
-	mlxsw_sp_nexthop_rif_fini(nh);
+	mlxsw_sp_nexthop4_type_fini(mlxsw_sp, nh);
 	mlxsw_sp_nexthop_remove(mlxsw_sp, nh);
 }
 
@@ -2342,7 +2386,6 @@ static void mlxsw_sp_nexthop4_event(struct mlxsw_sp *mlxsw_sp,
 {
 	struct mlxsw_sp_nexthop_key key;
 	struct mlxsw_sp_nexthop *nh;
-	struct mlxsw_sp_rif *rif;
 
 	if (mlxsw_sp->router->aborted)
 		return;
@@ -2352,18 +2395,12 @@ static void mlxsw_sp_nexthop4_event(struct mlxsw_sp *mlxsw_sp,
 	if (WARN_ON_ONCE(!nh))
 		return;
 
-	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, fib_nh->nh_dev);
-	if (!rif)
-		return;
-
 	switch (event) {
 	case FIB_EVENT_NH_ADD:
-		mlxsw_sp_nexthop_rif_init(nh, rif);
-		mlxsw_sp_nexthop_neigh_init(mlxsw_sp, nh);
+		mlxsw_sp_nexthop4_type_init(mlxsw_sp, nh, fib_nh);
 		break;
 	case FIB_EVENT_NH_DEL:
-		mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
-		mlxsw_sp_nexthop_rif_fini(nh);
+		mlxsw_sp_nexthop4_type_fini(mlxsw_sp, nh);
 		break;
 	}
 
@@ -2376,8 +2413,7 @@ static void mlxsw_sp_nexthop_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
 	struct mlxsw_sp_nexthop *nh, *tmp;
 
 	list_for_each_entry_safe(nh, tmp, &rif->nexthop_list, rif_list_node) {
-		mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
-		mlxsw_sp_nexthop_rif_fini(nh);
+		mlxsw_sp_nexthop_type_fini(mlxsw_sp, nh);
 		mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh->nh_grp);
 	}
 }
@@ -3487,22 +3523,16 @@ mlxsw_sp_fib6_entry_rt_find(const struct mlxsw_sp_fib6_entry *fib6_entry,
 	return NULL;
 }
 
-static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
-				  struct mlxsw_sp_nexthop_group *nh_grp,
-				  struct mlxsw_sp_nexthop *nh,
-				  const struct rt6_info *rt)
+static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
+				       struct mlxsw_sp_nexthop_group *nh_grp,
+				       struct mlxsw_sp_nexthop *nh,
+				       const struct rt6_info *rt)
 {
 	struct net_device *dev = rt->dst.dev;
 	struct mlxsw_sp_rif *rif;
 	int err;
 
-	nh->nh_grp = nh_grp;
-	memcpy(&nh->gw_addr, &rt->rt6i_gateway, sizeof(nh->gw_addr));
-
-	if (!dev)
-		return 0;
-	nh->ifindex = dev->ifindex;
-
+	nh->type = MLXSW_SP_NEXTHOP_TYPE_ETH;
 	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
 	if (!rif)
 		return 0;
@@ -3519,11 +3549,33 @@ static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
 	return err;
 }
 
+static void mlxsw_sp_nexthop6_type_fini(struct mlxsw_sp *mlxsw_sp,
+					struct mlxsw_sp_nexthop *nh)
+{
+	mlxsw_sp_nexthop_type_fini(mlxsw_sp, nh);
+}
+
+static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
+				  struct mlxsw_sp_nexthop_group *nh_grp,
+				  struct mlxsw_sp_nexthop *nh,
+				  const struct rt6_info *rt)
+{
+	struct net_device *dev = rt->dst.dev;
+
+	nh->nh_grp = nh_grp;
+	memcpy(&nh->gw_addr, &rt->rt6i_gateway, sizeof(nh->gw_addr));
+
+	if (!dev)
+		return 0;
+	nh->ifindex = dev->ifindex;
+
+	return mlxsw_sp_nexthop6_type_init(mlxsw_sp, nh_grp, nh, rt);
+}
+
 static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_nexthop *nh)
 {
-	mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
-	mlxsw_sp_nexthop_rif_fini(nh);
+	mlxsw_sp_nexthop6_type_fini(mlxsw_sp, nh);
 }
 
 static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp,
-- 
2.9.3

[patch net-next 14/21] mlxsw: spectrum_router: Support IPv4 overlay encap

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

This introduces some common code for tracking of offloaded IP-in-IP
tunnels, and support for offloading IPv4 overlay encapsulating routes in
particular. A follow-up patch will introduce IPv6 overlay as well.

Offloaded tunnels are kept in a linked list of mlxsw_sp_ipip_entry
objects hooked up in mlxsw_sp_router. A network device that represents
the tunnel is used as a key to look up the corresponding IPIP entry.
Note that in the future, more general keying mechanism will be needed,
because parts of the tunnel information can be provided by the route.

IPIP entries are reference counted, because several next hops may end up
using the same tunnel, and we only want to offload it once.

Encapsulation path hooks into next hop handling. Routes that forward to
a tunnel are now considered gateway routes, thus giving them the same
treatment that other remote routes get. An IPIP next hop type is
introduced.

Details of individual tunnel types are kept in an array of
mlxsw_sp_ipip_ops objects. If a tunnel type doesn't match any of the
known tunnel types, the next-hop is not considered an IPIP next hop.

The list of IPIP tunnel types is currently empty, follow-up patches will
add support for GRE. Traffic to IPIP tunnel types that are not
explicitly recognized by the driver traps and is handled in slow path.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.h    |  20 ++
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 238 ++++++++++++++++++++-
 2 files changed, 257 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
index 65eb493..7b40aa2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
@@ -41,9 +41,29 @@ enum mlxsw_sp_ipip_type {
 	MLXSW_SP_IPIP_TYPE_MAX,
 };
 
+struct mlxsw_sp_ipip_entry {
+	enum mlxsw_sp_ipip_type ipipt;
+	struct net_device *ol_dev; /* Overlay. */
+	struct mlxsw_sp_rif_ipip_lb *ol_lb;
+	unsigned int ref_count; /* Number of next hops using the tunnel. */
+	struct list_head ipip_list_node;
+};
+
 struct mlxsw_sp_ipip_ops {
 	int dev_type;
 	enum mlxsw_sp_l3proto ul_proto; /* Underlay. */
+
+	int (*nexthop_update)(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
+			      struct mlxsw_sp_ipip_entry *ipip_entry);
+
+	bool (*can_offload)(const struct mlxsw_sp *mlxsw_sp,
+			    const struct net_device *ol_dev,
+			    enum mlxsw_sp_l3proto ol_proto);
+
+	/* Return a configuration for creating an overlay loopback RIF. */
+	struct mlxsw_sp_rif_ipip_lb_config
+	(*ol_loopback_config)(struct mlxsw_sp *mlxsw_sp,
+			      const struct net_device *ol_dev);
 };
 
 extern const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[];
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 53bdd0f..231b597 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -89,6 +89,7 @@ struct mlxsw_sp_router {
 	struct delayed_work nexthop_probe_dw;
 #define MLXSW_SP_UNRESOLVED_NH_PROBE_INTERVAL 5000 /* ms */
 	struct list_head nexthop_neighs_list;
+	struct list_head ipip_list;
 	bool aborted;
 	struct notifier_block fib_nb;
 	const struct mlxsw_sp_rif_ops **rif_ops_arr;
@@ -915,6 +916,170 @@ static u32 mlxsw_sp_ipip_dev_ul_tb_id(const struct net_device *ol_dev)
 		return l3mdev_fib_table(ol_dev) ? : RT_TABLE_MAIN;
 }
 
+static struct mlxsw_sp_rif *
+mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
+		    const struct mlxsw_sp_rif_params *params);
+
+static struct mlxsw_sp_rif_ipip_lb *
+mlxsw_sp_ipip_ol_ipip_lb_create(struct mlxsw_sp *mlxsw_sp,
+				enum mlxsw_sp_ipip_type ipipt,
+				struct net_device *ol_dev)
+{
+	struct mlxsw_sp_rif_params_ipip_lb lb_params;
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
+	struct mlxsw_sp_rif *rif;
+
+	ipip_ops = mlxsw_sp->router->ipip_ops_arr[ipipt];
+	lb_params = (struct mlxsw_sp_rif_params_ipip_lb) {
+		.common.dev = ol_dev,
+		.common.lag = false,
+		.lb_config = ipip_ops->ol_loopback_config(mlxsw_sp, ol_dev),
+	};
+
+	rif = mlxsw_sp_rif_create(mlxsw_sp, &lb_params.common);
+	if (IS_ERR(rif))
+		return ERR_CAST(rif);
+	return container_of(rif, struct mlxsw_sp_rif_ipip_lb, common);
+}
+
+static struct mlxsw_sp_ipip_entry *
+mlxsw_sp_ipip_entry_alloc(struct mlxsw_sp *mlxsw_sp,
+			  enum mlxsw_sp_ipip_type ipipt,
+			  struct net_device *ol_dev)
+{
+	struct mlxsw_sp_ipip_entry *ipip_entry;
+	struct mlxsw_sp_ipip_entry *ret = NULL;
+
+	ipip_entry = kzalloc(sizeof(*ipip_entry), GFP_KERNEL);
+	if (!ipip_entry)
+		return ERR_PTR(-ENOMEM);
+
+	ipip_entry->ol_lb = mlxsw_sp_ipip_ol_ipip_lb_create(mlxsw_sp, ipipt,
+							    ol_dev);
+	if (IS_ERR(ipip_entry->ol_lb)) {
+		ret = ERR_CAST(ipip_entry->ol_lb);
+		goto err_ol_ipip_lb_create;
+	}
+
+	ipip_entry->ipipt = ipipt;
+	ipip_entry->ol_dev = ol_dev;
+
+	return ipip_entry;
+
+err_ol_ipip_lb_create:
+	kfree(ipip_entry);
+	return ret;
+}
+
+static void
+mlxsw_sp_ipip_entry_destroy(struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	WARN_ON(ipip_entry->ref_count > 0);
+	mlxsw_sp_rif_destroy(&ipip_entry->ol_lb->common);
+	kfree(ipip_entry);
+}
+
+static __be32
+mlxsw_sp_ipip_netdev_saddr4(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return tun->parms.iph.saddr;
+}
+
+union mlxsw_sp_l3addr
+mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
+			   const struct net_device *ol_dev)
+{
+	switch (proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		return (union mlxsw_sp_l3addr) {
+			.addr4 = mlxsw_sp_ipip_netdev_saddr4(ol_dev),
+		};
+	case MLXSW_SP_L3_PROTO_IPV6:
+		break;
+	};
+
+	WARN_ON(1);
+	return (union mlxsw_sp_l3addr) {
+		.addr4 = 0,
+	};
+}
+
+static bool mlxsw_sp_l3addr_eq(const union mlxsw_sp_l3addr *addr1,
+			       const union mlxsw_sp_l3addr *addr2)
+{
+	return !memcmp(addr1, addr2, sizeof(*addr1));
+}
+
+static bool
+mlxsw_sp_ipip_entry_saddr_matches(struct mlxsw_sp *mlxsw_sp,
+				  const enum mlxsw_sp_l3proto ul_proto,
+				  union mlxsw_sp_l3addr saddr,
+				  u32 ul_tb_id,
+				  struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	u32 tun_ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev);
+	enum mlxsw_sp_ipip_type ipipt = ipip_entry->ipipt;
+	union mlxsw_sp_l3addr tun_saddr;
+
+	if (mlxsw_sp->router->ipip_ops_arr[ipipt]->ul_proto != ul_proto)
+		return false;
+
+	tun_saddr = mlxsw_sp_ipip_netdev_saddr(ul_proto, ipip_entry->ol_dev);
+	return tun_ul_tb_id == ul_tb_id &&
+	       mlxsw_sp_l3addr_eq(&tun_saddr, &saddr);
+}
+
+static struct mlxsw_sp_ipip_entry *
+mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
+			enum mlxsw_sp_ipip_type ipipt,
+			struct net_device *ol_dev)
+{
+	u32 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ol_dev);
+	struct mlxsw_sp_router *router = mlxsw_sp->router;
+	struct mlxsw_sp_ipip_entry *ipip_entry;
+	enum mlxsw_sp_l3proto ul_proto;
+	union mlxsw_sp_l3addr saddr;
+
+	list_for_each_entry(ipip_entry, &mlxsw_sp->router->ipip_list,
+			    ipip_list_node) {
+		if (ipip_entry->ol_dev == ol_dev)
+			goto inc_ref_count;
+
+		/* The configuration where several tunnels have the same local
+		 * address in the same underlay table needs special treatment in
+		 * the HW. That is currently not implemented in the driver.
+		 */
+		ul_proto = router->ipip_ops_arr[ipip_entry->ipipt]->ul_proto;
+		saddr = mlxsw_sp_ipip_netdev_saddr(ul_proto, ol_dev);
+		if (mlxsw_sp_ipip_entry_saddr_matches(mlxsw_sp, ul_proto, saddr,
+						      ul_tb_id, ipip_entry))
+			return ERR_PTR(-EEXIST);
+	}
+
+	ipip_entry = mlxsw_sp_ipip_entry_alloc(mlxsw_sp, ipipt, ol_dev);
+	if (IS_ERR(ipip_entry))
+		return ipip_entry;
+
+	list_add_tail(&ipip_entry->ipip_list_node,
+		      &mlxsw_sp->router->ipip_list);
+
+inc_ref_count:
+	++ipip_entry->ref_count;
+	return ipip_entry;
+}
+
+static void
+mlxsw_sp_ipip_entry_put(struct mlxsw_sp *mlxsw_sp,
+			struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	if (--ipip_entry->ref_count == 0) {
+		list_del(&ipip_entry->ipip_list_node);
+		mlxsw_sp_ipip_entry_destroy(ipip_entry);
+	}
+}
+
 struct mlxsw_sp_neigh_key {
 	struct neighbour *n;
 };
@@ -1654,6 +1819,7 @@ static void mlxsw_sp_neigh_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
 
 enum mlxsw_sp_nexthop_type {
 	MLXSW_SP_NEXTHOP_TYPE_ETH,
+	MLXSW_SP_NEXTHOP_TYPE_IPIP,
 };
 
 struct mlxsw_sp_nexthop_key {
@@ -1683,6 +1849,7 @@ struct mlxsw_sp_nexthop {
 	enum mlxsw_sp_nexthop_type type;
 	union {
 		struct mlxsw_sp_neigh_entry *neigh_entry;
+		struct mlxsw_sp_ipip_entry *ipip_entry;
 	};
 };
 
@@ -1970,6 +2137,16 @@ static int mlxsw_sp_nexthop_mac_update(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 }
 
+static int mlxsw_sp_nexthop_ipip_update(struct mlxsw_sp *mlxsw_sp,
+					u32 adj_index,
+					struct mlxsw_sp_nexthop *nh)
+{
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
+
+	ipip_ops = mlxsw_sp->router->ipip_ops_arr[nh->ipip_entry->ipipt];
+	return ipip_ops->nexthop_update(mlxsw_sp, adj_index, nh->ipip_entry);
+}
+
 static int
 mlxsw_sp_nexthop_group_update(struct mlxsw_sp *mlxsw_sp,
 			      struct mlxsw_sp_nexthop_group *nh_grp,
@@ -1994,6 +2171,10 @@ mlxsw_sp_nexthop_group_update(struct mlxsw_sp *mlxsw_sp,
 				err = mlxsw_sp_nexthop_mac_update
 					    (mlxsw_sp, adj_index, nh);
 				break;
+			case MLXSW_SP_NEXTHOP_TYPE_IPIP:
+				err = mlxsw_sp_nexthop_ipip_update
+					    (mlxsw_sp, adj_index, nh);
+				break;
 			}
 			if (err)
 				return err;
@@ -2297,6 +2478,46 @@ static bool mlxsw_sp_netdev_ipip_type(const struct mlxsw_sp *mlxsw_sp,
 	return false;
 }
 
+static int mlxsw_sp_nexthop_ipip_init(struct mlxsw_sp *mlxsw_sp,
+				      enum mlxsw_sp_ipip_type ipipt,
+				      struct mlxsw_sp_nexthop *nh,
+				      struct net_device *ol_dev)
+{
+	if (!nh->nh_grp->gateway || nh->ipip_entry)
+		return 0;
+
+	nh->ipip_entry = mlxsw_sp_ipip_entry_get(mlxsw_sp, ipipt, ol_dev);
+	if (IS_ERR(nh->ipip_entry))
+		return PTR_ERR(nh->ipip_entry);
+
+	__mlxsw_sp_nexthop_neigh_update(nh, false);
+	return 0;
+}
+
+static void mlxsw_sp_nexthop_ipip_fini(struct mlxsw_sp *mlxsw_sp,
+				       struct mlxsw_sp_nexthop *nh)
+{
+	struct mlxsw_sp_ipip_entry *ipip_entry = nh->ipip_entry;
+
+	if (!ipip_entry)
+		return;
+
+	__mlxsw_sp_nexthop_neigh_update(nh, true);
+	mlxsw_sp_ipip_entry_put(mlxsw_sp, ipip_entry);
+	nh->ipip_entry = NULL;
+}
+
+static bool mlxsw_sp_nexthop4_ipip_type(const struct mlxsw_sp *mlxsw_sp,
+					const struct fib_nh *fib_nh,
+					enum mlxsw_sp_ipip_type *p_ipipt)
+{
+	struct net_device *dev = fib_nh->nh_dev;
+
+	return dev &&
+	       fib_nh->nh_parent->fib_type == RTN_UNICAST &&
+	       mlxsw_sp_netdev_ipip_type(mlxsw_sp, dev, p_ipipt);
+}
+
 static void mlxsw_sp_nexthop_type_fini(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_nexthop *nh)
 {
@@ -2305,6 +2526,9 @@ static void mlxsw_sp_nexthop_type_fini(struct mlxsw_sp *mlxsw_sp,
 		mlxsw_sp_nexthop_neigh_fini(mlxsw_sp, nh);
 		mlxsw_sp_nexthop_rif_fini(nh);
 		break;
+	case MLXSW_SP_NEXTHOP_TYPE_IPIP:
+		mlxsw_sp_nexthop_ipip_fini(mlxsw_sp, nh);
+		break;
 	}
 }
 
@@ -2312,10 +2536,19 @@ static int mlxsw_sp_nexthop4_type_init(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_nexthop *nh,
 				       struct fib_nh *fib_nh)
 {
+	struct mlxsw_sp_router *router = mlxsw_sp->router;
 	struct net_device *dev = fib_nh->nh_dev;
+	enum mlxsw_sp_ipip_type ipipt;
 	struct mlxsw_sp_rif *rif;
 	int err;
 
+	if (mlxsw_sp_nexthop4_ipip_type(mlxsw_sp, fib_nh, &ipipt) &&
+	    router->ipip_ops_arr[ipipt]->can_offload(mlxsw_sp, dev,
+						     MLXSW_SP_L3_PROTO_IPV4)) {
+		nh->type = MLXSW_SP_NEXTHOP_TYPE_IPIP;
+		return mlxsw_sp_nexthop_ipip_init(mlxsw_sp, ipipt, nh, dev);
+	}
+
 	nh->type = MLXSW_SP_NEXTHOP_TYPE_ETH;
 	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
 	if (!rif)
@@ -2421,7 +2654,8 @@ static void mlxsw_sp_nexthop_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
 static bool mlxsw_sp_fi_is_gateway(const struct mlxsw_sp *mlxsw_sp,
 				   const struct fib_info *fi)
 {
-	return fi->fib_nh->nh_scope == RT_SCOPE_LINK;
+	return fi->fib_nh->nh_scope == RT_SCOPE_LINK ||
+	       mlxsw_sp_nexthop4_ipip_type(mlxsw_sp, fi->fib_nh, NULL);
 }
 
 static struct mlxsw_sp_nexthop_group *
@@ -5411,11 +5645,13 @@ static void mlxsw_sp_rifs_fini(struct mlxsw_sp *mlxsw_sp)
 static int mlxsw_sp_ipips_init(struct mlxsw_sp *mlxsw_sp)
 {
 	mlxsw_sp->router->ipip_ops_arr = mlxsw_sp_ipip_ops_arr;
+	INIT_LIST_HEAD(&mlxsw_sp->router->ipip_list);
 	return 0;
 }
 
 static void mlxsw_sp_ipips_fini(struct mlxsw_sp *mlxsw_sp)
 {
+	WARN_ON(!list_empty(&mlxsw_sp->router->ipip_list));
 }
 
 static void mlxsw_sp_router_fib_dump_flush(struct notifier_block *nb)
-- 
2.9.3

[patch net-next 15/21] mlxsw: spectrum_router: Support IPv6 overlay encap

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Add the missing bits to recognize IPv6 next hops as IPIP ones to enable
offloading of IPv6 overlay encapsulation.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c    | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 231b597..05afd53 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3757,15 +3757,32 @@ mlxsw_sp_fib6_entry_rt_find(const struct mlxsw_sp_fib6_entry *fib6_entry,
 	return NULL;
 }
 
+static bool mlxsw_sp_nexthop6_ipip_type(const struct mlxsw_sp *mlxsw_sp,
+					const struct rt6_info *rt,
+					enum mlxsw_sp_ipip_type *ret)
+{
+	return rt->dst.dev &&
+	       mlxsw_sp_netdev_ipip_type(mlxsw_sp, rt->dst.dev, ret);
+}
+
 static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_nexthop_group *nh_grp,
 				       struct mlxsw_sp_nexthop *nh,
 				       const struct rt6_info *rt)
 {
+	struct mlxsw_sp_router *router = mlxsw_sp->router;
 	struct net_device *dev = rt->dst.dev;
+	enum mlxsw_sp_ipip_type ipipt;
 	struct mlxsw_sp_rif *rif;
 	int err;
 
+	if (mlxsw_sp_nexthop6_ipip_type(mlxsw_sp, rt, &ipipt) &&
+	    router->ipip_ops_arr[ipipt]->can_offload(mlxsw_sp, dev,
+						     MLXSW_SP_L3_PROTO_IPV6)) {
+		nh->type = MLXSW_SP_NEXTHOP_TYPE_IPIP;
+		return mlxsw_sp_nexthop_ipip_init(mlxsw_sp, ipipt, nh, dev);
+	}
+
 	nh->type = MLXSW_SP_NEXTHOP_TYPE_ETH;
 	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
 	if (!rif)
@@ -3815,7 +3832,8 @@ static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,
 static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp,
 				    const struct rt6_info *rt)
 {
-	return rt->rt6i_flags & RTF_GATEWAY;
+	return rt->rt6i_flags & RTF_GATEWAY ||
+	       mlxsw_sp_nexthop6_ipip_type(mlxsw_sp, rt, NULL);
 }
 
 static struct mlxsw_sp_nexthop_group *
-- 
2.9.3

[patch net-next 16/21] mlxsw: spectrum_router: Support IPv4 underlay decap

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

Unlike encapsulation, which is represented by a next hop forwarding to
an IPIP tunnel, decapsulation is a type of local route. It is created
for local routes whose prefix corresponds to the local address of one of
offloaded IPIP tunnels. When the tunnel is removed (i.e. all the encap
next hops are removed), the decap offload is migrated back to a trap for
resolution in slow path.

This patch assumes that decap route is already present when encap route
is added. A follow-up patch will fix this issue.

Note that this patch only supports IPv4 underlay. Support for IPv6
underlay will be subject to follow-up work apart from this patchset.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.h    |   7 +
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 141 ++++++++++++++++++++-
 .../net/ethernet/mellanox/mlxsw/spectrum_router.h  |   3 +
 3 files changed, 146 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
index 7b40aa2..cd986bd 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
@@ -36,6 +36,7 @@
 #define _MLXSW_IPIP_H_
 
 #include "spectrum_router.h"
+#include <net/ip_fib.h>
 
 enum mlxsw_sp_ipip_type {
 	MLXSW_SP_IPIP_TYPE_MAX,
@@ -46,6 +47,7 @@ struct mlxsw_sp_ipip_entry {
 	struct net_device *ol_dev; /* Overlay. */
 	struct mlxsw_sp_rif_ipip_lb *ol_lb;
 	unsigned int ref_count; /* Number of next hops using the tunnel. */
+	struct mlxsw_sp_fib_entry *decap_fib_entry;
 	struct list_head ipip_list_node;
 };
 
@@ -64,6 +66,11 @@ struct mlxsw_sp_ipip_ops {
 	struct mlxsw_sp_rif_ipip_lb_config
 	(*ol_loopback_config)(struct mlxsw_sp *mlxsw_sp,
 			      const struct net_device *ol_dev);
+
+	int (*fib_entry_op)(struct mlxsw_sp *mlxsw_sp,
+			    struct mlxsw_sp_ipip_entry *ipip_entry,
+			    enum mlxsw_reg_ralue_op op,
+			    u32 tunnel_index);
 };
 
 extern const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[];
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 05afd53..0d09f81 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -381,6 +381,14 @@ enum mlxsw_sp_fib_entry_type {
 	MLXSW_SP_FIB_ENTRY_TYPE_REMOTE,
 	MLXSW_SP_FIB_ENTRY_TYPE_LOCAL,
 	MLXSW_SP_FIB_ENTRY_TYPE_TRAP,
+
+	/* This is a special case of local delivery, where a packet should be
+	 * decapsulated on reception. Note that there is no corresponding ENCAP,
+	 * because that's a type of next hop, not of FIB entry. (There can be
+	 * several next hops in a REMOTE entry, and some of them may be
+	 * encapsulating entries.)
+	 */
+	MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP,
 };
 
 struct mlxsw_sp_nexthop_group;
@@ -394,12 +402,18 @@ struct mlxsw_sp_fib_node {
 	struct mlxsw_sp_fib_key key;
 };
 
+struct mlxsw_sp_fib_entry_decap {
+	struct mlxsw_sp_ipip_entry *ipip_entry;
+	u32 tunnel_index;
+};
+
 struct mlxsw_sp_fib_entry {
 	struct list_head list;
 	struct mlxsw_sp_fib_node *fib_node;
 	enum mlxsw_sp_fib_entry_type type;
 	struct list_head nexthop_group_node;
 	struct mlxsw_sp_nexthop_group *nh_group;
+	struct mlxsw_sp_fib_entry_decap decap; /* Valid for decap entries. */
 };
 
 struct mlxsw_sp_fib4_entry {
@@ -1031,6 +1045,48 @@ mlxsw_sp_ipip_entry_saddr_matches(struct mlxsw_sp *mlxsw_sp,
 	       mlxsw_sp_l3addr_eq(&tun_saddr, &saddr);
 }
 
+static int
+mlxsw_sp_fib_entry_decap_init(struct mlxsw_sp *mlxsw_sp,
+			      struct mlxsw_sp_fib_entry *fib_entry,
+			      struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	u32 tunnel_index;
+	int err;
+
+	err = mlxsw_sp_kvdl_alloc(mlxsw_sp, 1, &tunnel_index);
+	if (err)
+		return err;
+
+	ipip_entry->decap_fib_entry = fib_entry;
+	fib_entry->decap.ipip_entry = ipip_entry;
+	fib_entry->decap.tunnel_index = tunnel_index;
+	return 0;
+}
+
+static void mlxsw_sp_fib_entry_decap_fini(struct mlxsw_sp *mlxsw_sp,
+					  struct mlxsw_sp_fib_entry *fib_entry)
+{
+	/* Unlink this node from the IPIP entry that it's the decap entry of. */
+	fib_entry->decap.ipip_entry->decap_fib_entry = NULL;
+	fib_entry->decap.ipip_entry = NULL;
+	mlxsw_sp_kvdl_free(mlxsw_sp, fib_entry->decap.tunnel_index);
+}
+
+static int mlxsw_sp_fib_entry_update(struct mlxsw_sp *mlxsw_sp,
+				     struct mlxsw_sp_fib_entry *fib_entry);
+
+static void
+mlxsw_sp_ipip_entry_demote_decap(struct mlxsw_sp *mlxsw_sp,
+				 struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	struct mlxsw_sp_fib_entry *fib_entry = ipip_entry->decap_fib_entry;
+
+	mlxsw_sp_fib_entry_decap_fini(mlxsw_sp, fib_entry);
+	fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
+
+	mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
+}
+
 static struct mlxsw_sp_ipip_entry *
 mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
 			enum mlxsw_sp_ipip_type ipipt,
@@ -1076,10 +1132,51 @@ mlxsw_sp_ipip_entry_put(struct mlxsw_sp *mlxsw_sp,
 {
 	if (--ipip_entry->ref_count == 0) {
 		list_del(&ipip_entry->ipip_list_node);
+		if (ipip_entry->decap_fib_entry)
+			mlxsw_sp_ipip_entry_demote_decap(mlxsw_sp, ipip_entry);
 		mlxsw_sp_ipip_entry_destroy(ipip_entry);
 	}
 }
 
+static bool
+mlxsw_sp_ipip_entry_matches_decap(struct mlxsw_sp *mlxsw_sp,
+				  const struct net_device *ul_dev,
+				  enum mlxsw_sp_l3proto ul_proto,
+				  union mlxsw_sp_l3addr ul_dip,
+				  struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	u32 ul_tb_id = l3mdev_fib_table(ul_dev) ? : RT_TABLE_MAIN;
+	enum mlxsw_sp_ipip_type ipipt = ipip_entry->ipipt;
+	struct net_device *ipip_ul_dev;
+
+	if (mlxsw_sp->router->ipip_ops_arr[ipipt]->ul_proto != ul_proto)
+		return false;
+
+	ipip_ul_dev = __mlxsw_sp_ipip_netdev_ul_dev_get(ipip_entry->ol_dev);
+	return mlxsw_sp_ipip_entry_saddr_matches(mlxsw_sp, ul_proto, ul_dip,
+						 ul_tb_id, ipip_entry) &&
+	       (!ipip_ul_dev || ipip_ul_dev == ul_dev);
+}
+
+/* Given decap parameters, find the corresponding IPIP entry. */
+static struct mlxsw_sp_ipip_entry *
+mlxsw_sp_ipip_entry_find_by_decap(struct mlxsw_sp *mlxsw_sp,
+				  const struct net_device *ul_dev,
+				  enum mlxsw_sp_l3proto ul_proto,
+				  union mlxsw_sp_l3addr ul_dip)
+{
+	struct mlxsw_sp_ipip_entry *ipip_entry;
+
+	list_for_each_entry(ipip_entry, &mlxsw_sp->router->ipip_list,
+			    ipip_list_node)
+		if (mlxsw_sp_ipip_entry_matches_decap(mlxsw_sp, ul_dev,
+						      ul_proto, ul_dip,
+						      ipip_entry))
+			return ipip_entry;
+
+	return NULL;
+}
+
 struct mlxsw_sp_neigh_key {
 	struct neighbour *n;
 };
@@ -2186,9 +2283,6 @@ mlxsw_sp_nexthop_group_update(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
-static int mlxsw_sp_fib_entry_update(struct mlxsw_sp *mlxsw_sp,
-				     struct mlxsw_sp_fib_entry *fib_entry);
-
 static bool
 mlxsw_sp_fib_node_entry_is_first(const struct mlxsw_sp_fib_node *fib_node,
 				 const struct mlxsw_sp_fib_entry *fib_entry);
@@ -2779,6 +2873,8 @@ mlxsw_sp_fib_entry_should_offload(const struct mlxsw_sp_fib_entry *fib_entry)
 		return !!nh_group->adj_index_valid;
 	case MLXSW_SP_FIB_ENTRY_TYPE_LOCAL:
 		return !!nh_group->nh_rif;
+	case MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP:
+		return true;
 	default:
 		return false;
 	}
@@ -2810,7 +2906,8 @@ mlxsw_sp_fib4_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)
 	struct mlxsw_sp_nexthop_group *nh_grp = fib_entry->nh_group;
 	int i;
 
-	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL) {
+	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL ||
+	    fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP) {
 		nh_grp->nexthops->key.fib_nh->nh_flags |= RTNH_F_OFFLOAD;
 		return;
 	}
@@ -3015,6 +3112,22 @@ static int mlxsw_sp_fib_entry_op_trap(struct mlxsw_sp *mlxsw_sp,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
 }
 
+static int
+mlxsw_sp_fib_entry_op_ipip_decap(struct mlxsw_sp *mlxsw_sp,
+				 struct mlxsw_sp_fib_entry *fib_entry,
+				 enum mlxsw_reg_ralue_op op)
+{
+	struct mlxsw_sp_ipip_entry *ipip_entry = fib_entry->decap.ipip_entry;
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
+
+	if (WARN_ON(!ipip_entry))
+		return -EINVAL;
+
+	ipip_ops = mlxsw_sp->router->ipip_ops_arr[ipip_entry->ipipt];
+	return ipip_ops->fib_entry_op(mlxsw_sp, ipip_entry, op,
+				      fib_entry->decap.tunnel_index);
+}
+
 static int __mlxsw_sp_fib_entry_op(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_fib_entry *fib_entry,
 				   enum mlxsw_reg_ralue_op op)
@@ -3026,6 +3139,9 @@ static int __mlxsw_sp_fib_entry_op(struct mlxsw_sp *mlxsw_sp,
 		return mlxsw_sp_fib_entry_op_local(mlxsw_sp, fib_entry, op);
 	case MLXSW_SP_FIB_ENTRY_TYPE_TRAP:
 		return mlxsw_sp_fib_entry_op_trap(mlxsw_sp, fib_entry, op);
+	case MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP:
+		return mlxsw_sp_fib_entry_op_ipip_decap(mlxsw_sp,
+							fib_entry, op);
 	}
 	return -EINVAL;
 }
@@ -3060,11 +3176,23 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp,
 			     const struct fib_entry_notifier_info *fen_info,
 			     struct mlxsw_sp_fib_entry *fib_entry)
 {
+	union mlxsw_sp_l3addr dip = { .addr4 = htonl(fen_info->dst) };
+	struct net_device *dev = fen_info->fi->fib_dev;
+	struct mlxsw_sp_ipip_entry *ipip_entry;
 	struct fib_info *fi = fen_info->fi;
 
 	switch (fen_info->type) {
-	case RTN_BROADCAST: /* fall through */
 	case RTN_LOCAL:
+		ipip_entry = mlxsw_sp_ipip_entry_find_by_decap(mlxsw_sp, dev,
+						 MLXSW_SP_L3_PROTO_IPV4, dip);
+		if (ipip_entry) {
+			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP;
+			return mlxsw_sp_fib_entry_decap_init(mlxsw_sp,
+							     fib_entry,
+							     ipip_entry);
+		}
+		/* fall through */
+	case RTN_BROADCAST:
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
 		return 0;
 	case RTN_UNREACHABLE: /* fall through */
@@ -3557,6 +3685,9 @@ mlxsw_sp_fib4_node_entry_unlink(struct mlxsw_sp *mlxsw_sp,
 {
 	mlxsw_sp_fib_node_entry_del(mlxsw_sp, &fib4_entry->common);
 	mlxsw_sp_fib4_node_list_remove(fib4_entry);
+
+	if (fib4_entry->common.type == MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP)
+		mlxsw_sp_fib_entry_decap_fini(mlxsw_sp, &fib4_entry->common);
 }
 
 static void mlxsw_sp_fib4_entry_replace(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 a5732aa..4276f5f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -97,5 +97,8 @@ mlxsw_sp_neigh_entry_counter_update(struct mlxsw_sp *mlxsw_sp,
 				    struct mlxsw_sp_neigh_entry *neigh_entry,
 				    bool adding);
 bool mlxsw_sp_neigh_ipv6_ignore(struct mlxsw_sp_neigh_entry *neigh_entry);
+union mlxsw_sp_l3addr
+mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
+			   const struct net_device *ol_dev);
 
 #endif /* _MLXSW_ROUTER_H_*/
-- 
2.9.3

[patch net-next 17/21] mlxsw: spectrum_router: Use existing decap route

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

The local route that points at IPIP's underlay device (decap route) can
be present long before the GRE device. Thus when an encap route is
added, it's necessary to look inside the underlay FIB if the decap route
is already present. If so, the current trap offload needs to be
withdrawn and replaced with a decap offload.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 80 ++++++++++++++++++++--
 1 file changed, 76 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 0d09f81..2189cf0 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1072,6 +1072,9 @@ static void mlxsw_sp_fib_entry_decap_fini(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_kvdl_free(mlxsw_sp, fib_entry->decap.tunnel_index);
 }
 
+static struct mlxsw_sp_fib_node *
+mlxsw_sp_fib_node_lookup(struct mlxsw_sp_fib *fib, const void *addr,
+			 size_t addr_len, unsigned char prefix_len);
 static int mlxsw_sp_fib_entry_update(struct mlxsw_sp *mlxsw_sp,
 				     struct mlxsw_sp_fib_entry *fib_entry);
 
@@ -1087,6 +1090,73 @@ mlxsw_sp_ipip_entry_demote_decap(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
 }
 
+static void
+mlxsw_sp_ipip_entry_promote_decap(struct mlxsw_sp *mlxsw_sp,
+				  struct mlxsw_sp_ipip_entry *ipip_entry,
+				  struct mlxsw_sp_fib_entry *decap_fib_entry)
+{
+	if (mlxsw_sp_fib_entry_decap_init(mlxsw_sp, decap_fib_entry,
+					  ipip_entry))
+		return;
+	decap_fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP;
+
+	if (mlxsw_sp_fib_entry_update(mlxsw_sp, decap_fib_entry))
+		mlxsw_sp_ipip_entry_demote_decap(mlxsw_sp, ipip_entry);
+}
+
+/* Given an IPIP entry, find the corresponding decap route. */
+static struct mlxsw_sp_fib_entry *
+mlxsw_sp_ipip_entry_find_decap(struct mlxsw_sp *mlxsw_sp,
+			       struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	static struct mlxsw_sp_fib_node *fib_node;
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
+	struct mlxsw_sp_fib_entry *fib_entry;
+	unsigned char saddr_prefix_len;
+	union mlxsw_sp_l3addr saddr;
+	struct mlxsw_sp_fib *ul_fib;
+	struct mlxsw_sp_vr *ul_vr;
+	const void *saddrp;
+	size_t saddr_len;
+	u32 ul_tb_id;
+	u32 saddr4;
+
+	ipip_ops = mlxsw_sp->router->ipip_ops_arr[ipip_entry->ipipt];
+
+	ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev);
+	ul_vr = mlxsw_sp_vr_find(mlxsw_sp, ul_tb_id);
+	if (!ul_vr)
+		return NULL;
+
+	ul_fib = mlxsw_sp_vr_fib(ul_vr, ipip_ops->ul_proto);
+	saddr = mlxsw_sp_ipip_netdev_saddr(ipip_ops->ul_proto,
+					   ipip_entry->ol_dev);
+
+	switch (ipip_ops->ul_proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		saddr4 = be32_to_cpu(saddr.addr4);
+		saddrp = &saddr4;
+		saddr_len = 4;
+		saddr_prefix_len = 32;
+		break;
+	case MLXSW_SP_L3_PROTO_IPV6:
+		WARN_ON(1);
+		return NULL;
+	}
+
+	fib_node = mlxsw_sp_fib_node_lookup(ul_fib, saddrp, saddr_len,
+					    saddr_prefix_len);
+	if (!fib_node || list_empty(&fib_node->entry_list))
+		return NULL;
+
+	fib_entry = list_first_entry(&fib_node->entry_list,
+				     struct mlxsw_sp_fib_entry, list);
+	if (fib_entry->type != MLXSW_SP_FIB_ENTRY_TYPE_TRAP)
+		return NULL;
+
+	return fib_entry;
+}
+
 static struct mlxsw_sp_ipip_entry *
 mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
 			enum mlxsw_sp_ipip_type ipipt,
@@ -1094,6 +1164,7 @@ mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
 {
 	u32 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ol_dev);
 	struct mlxsw_sp_router *router = mlxsw_sp->router;
+	struct mlxsw_sp_fib_entry *decap_fib_entry;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
 	enum mlxsw_sp_l3proto ul_proto;
 	union mlxsw_sp_l3addr saddr;
@@ -1118,6 +1189,11 @@ mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
 	if (IS_ERR(ipip_entry))
 		return ipip_entry;
 
+	decap_fib_entry = mlxsw_sp_ipip_entry_find_decap(mlxsw_sp, ipip_entry);
+	if (decap_fib_entry)
+		mlxsw_sp_ipip_entry_promote_decap(mlxsw_sp, ipip_entry,
+						  decap_fib_entry);
+
 	list_add_tail(&ipip_entry->ipip_list_node,
 		      &mlxsw_sp->router->ipip_list);
 
@@ -3259,10 +3335,6 @@ static void mlxsw_sp_fib4_entry_destroy(struct mlxsw_sp *mlxsw_sp,
 	kfree(fib4_entry);
 }
 
-static struct mlxsw_sp_fib_node *
-mlxsw_sp_fib_node_lookup(struct mlxsw_sp_fib *fib, const void *addr,
-			 size_t addr_len, unsigned char prefix_len);
-
 static struct mlxsw_sp_fib4_entry *
 mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
 			   const struct fib_entry_notifier_info *fen_info)
-- 
2.9.3

[patch net-next 18/21] mlxsw: spectrum: Register for IPIP_DECAP_ERROR trap

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

These traps are generated for packets that fail checks for source IP,
encapsulation type, or GRE key. Trap these packets to CPU for follow-up
handling by the kernel, which will send ICMP destination unreachable
responses.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 1 +
 drivers/net/ethernet/mellanox/mlxsw/trap.h     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 992cbfa..ed7cd6c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3400,6 +3400,7 @@ static const struct mlxsw_listener mlxsw_sp_listener[] = {
 	MLXSW_SP_RXL_MARK(HOST_MISS_IPV6, TRAP_TO_CPU, HOST_MISS, false),
 	MLXSW_SP_RXL_MARK(ROUTER_ALERT_IPV4, TRAP_TO_CPU, ROUTER_EXP, false),
 	MLXSW_SP_RXL_MARK(ROUTER_ALERT_IPV6, TRAP_TO_CPU, ROUTER_EXP, false),
+	MLXSW_SP_RXL_MARK(IPIP_DECAP_ERROR, TRAP_TO_CPU, ROUTER_EXP, false),
 	/* PKT Sample trap */
 	MLXSW_RXL(mlxsw_sp_rx_listener_sample_func, PKT_SAMPLE, MIRROR_TO_CPU,
 		  false, SP_IP2ME, DISCARD),
diff --git a/drivers/net/ethernet/mellanox/mlxsw/trap.h b/drivers/net/ethernet/mellanox/mlxsw/trap.h
index 6165239..f396a1f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/trap.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/trap.h
@@ -85,6 +85,7 @@ enum {
 	MLXSW_TRAP_ID_HOST_MISS_IPV4 = 0x90,
 	MLXSW_TRAP_ID_IPV6_MC_LINK_LOCAL_DEST = 0x91,
 	MLXSW_TRAP_ID_HOST_MISS_IPV6 = 0x92,
+	MLXSW_TRAP_ID_IPIP_DECAP_ERROR = 0xB1,
 	MLXSW_TRAP_ID_ROUTER_ALERT_IPV4 = 0xD6,
 	MLXSW_TRAP_ID_ROUTER_ALERT_IPV6 = 0xD7,
 	MLXSW_TRAP_ID_ACL0 = 0x1C0,
-- 
2.9.3

[patch net-next 19/21] mlxsw: spectrum_router: Add loopback accessors

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

struct mlxsw_sp_rif is a router-private structure, and therefore
everything related to it is as well: parameters, and derived RIF types
including loopbacks. IPIP module needs access to some details of
loopback interfaces, but exporting all the RIF shebang would create too
large an interface.

So instead export just the bare minimum necessary: accessors for RIF
index and underlay VRF ID.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 10 ++++++++++
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 2189cf0..6068eea 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -5007,6 +5007,16 @@ u16 mlxsw_sp_rif_index(const struct mlxsw_sp_rif *rif)
 	return rif->rif_index;
 }
 
+u16 mlxsw_sp_ipip_lb_rif_index(const struct mlxsw_sp_rif_ipip_lb *lb_rif)
+{
+	return lb_rif->common.rif_index;
+}
+
+u16 mlxsw_sp_ipip_lb_ul_vr_id(const struct mlxsw_sp_rif_ipip_lb *lb_rif)
+{
+	return lb_rif->ul_vr_id;
+}
+
 int mlxsw_sp_rif_dev_ifindex(const struct mlxsw_sp_rif *rif)
 {
 	return rif->dev->ifindex;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
index 4276f5f..9632476 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -48,6 +48,7 @@ union mlxsw_sp_l3addr {
 	struct in6_addr addr6;
 };
 
+struct mlxsw_sp_rif_ipip_lb;
 struct mlxsw_sp_rif_ipip_lb_config {
 	enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
 	u32 okey;
@@ -65,6 +66,8 @@ struct mlxsw_sp_neigh_entry;
 struct mlxsw_sp_rif *mlxsw_sp_rif_by_index(const struct mlxsw_sp *mlxsw_sp,
 					   u16 rif_index);
 u16 mlxsw_sp_rif_index(const struct mlxsw_sp_rif *rif);
+u16 mlxsw_sp_ipip_lb_rif_index(const struct mlxsw_sp_rif_ipip_lb *rif);
+u16 mlxsw_sp_ipip_lb_ul_vr_id(const struct mlxsw_sp_rif_ipip_lb *rif);
 int mlxsw_sp_rif_dev_ifindex(const struct mlxsw_sp_rif *rif);
 int mlxsw_sp_rif_counter_value_get(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_rif *rif,
-- 
2.9.3

[patch net-next 20/21] mlxsw: spectrum_router: Support GRE tunnels

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

This patch introduces callbacks and tunnel type to offload GRE tunnels.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.c    | 176 +++++++++++++++++++++
 .../net/ethernet/mellanox/mlxsw/spectrum_ipip.h    |   1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  |  26 +++
 .../net/ethernet/mellanox/mlxsw/spectrum_router.h  |   4 +
 4 files changed, 207 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
index 20b0b96..702fe94 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
@@ -32,7 +32,183 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <net/ip_tunnels.h>
+
 #include "spectrum_ipip.h"
 
+static bool
+mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return !!(tun->parms.i_flags & TUNNEL_KEY);
+}
+
+static bool
+mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return !!(tun->parms.o_flags & TUNNEL_KEY);
+}
+
+static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return mlxsw_sp_ipip_netdev_has_ikey(ol_dev) ?
+		be32_to_cpu(tun->parms.i_key) : 0;
+}
+
+static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
+		be32_to_cpu(tun->parms.o_key) : 0;
+}
+
+static int
+mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
+				  struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
+	__be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
+	char ratr_pl[MLXSW_REG_RATR_LEN];
+
+	mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
+			    true, MLXSW_REG_RATR_TYPE_IPIP,
+			    adj_index, rif_index);
+	mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));
+
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
+}
+
+static int
+mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
+				     u32 tunnel_index,
+				     struct mlxsw_sp_ipip_entry *ipip_entry)
+{
+	bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev);
+	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
+	u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev);
+	char rtdp_pl[MLXSW_REG_RTDP_LEN];
+	unsigned int type_check;
+	u32 daddr4;
+
+	mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index);
+
+	type_check = has_ikey ?
+		MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
+		MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;
+
+	/* Linux demuxes tunnels based on packet SIP (which must match tunnel
+	 * remote IP). Thus configure decap so that it filters out packets that
+	 * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
+	 * generated for packets that fail this criterion. Linux then handles
+	 * such packets in slow path and generates ICMP destination unreachable.
+	 */
+	daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
+	mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
+				  MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
+				  type_check, has_ikey, daddr4, ikey);
+
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
+}
+
+static int
+mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
+				      u32 dip, u8 prefix_len, u16 ul_vr_id,
+				      enum mlxsw_reg_ralue_op op,
+				      u32 tunnel_index)
+{
+	char ralue_pl[MLXSW_REG_RALUE_LEN];
+
+	mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
+			      ul_vr_id, prefix_len, dip);
+	mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
+}
+
+static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
+					struct mlxsw_sp_ipip_entry *ipip_entry,
+					enum mlxsw_reg_ralue_op op,
+					u32 tunnel_index)
+{
+	u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
+	__be32 dip;
+	int err;
+
+	err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
+						   ipip_entry);
+	if (err)
+		return err;
+
+	dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
+					 ipip_entry->ol_dev).addr4;
+	return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
+						     32, ul_vr_id, op,
+						     tunnel_index);
+}
+
+static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
+					  const struct net_device *ol_dev)
+{
+	union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
+	union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);
+	union mlxsw_sp_l3addr naddr = {0};
+
+	/* Tunnels with unset local or remote address are valid in Linux and
+	 * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
+	 * (NBMA) tunnels. In principle these can be offloaded, but the driver
+	 * currently doesn't support this. So punt.
+	 */
+	return memcmp(&saddr, &naddr, sizeof(naddr)) &&
+	       memcmp(&daddr, &naddr, sizeof(naddr));
+}
+
+static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
+					   const struct net_device *ol_dev,
+					   enum mlxsw_sp_l3proto ol_proto)
+{
+	struct ip_tunnel *tunnel = netdev_priv(ol_dev);
+	__be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
+	bool inherit_ttl = tunnel->parms.iph.ttl == 0;
+	bool inherit_tos = tunnel->parms.iph.tos & 0x1;
+
+	return (tunnel->parms.i_flags & ~okflags) == 0 &&
+	       (tunnel->parms.o_flags & ~okflags) == 0 &&
+	       inherit_ttl && inherit_tos &&
+	       mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
+}
+
+static struct mlxsw_sp_rif_ipip_lb_config
+mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp,
+				      const struct net_device *ol_dev)
+{
+	enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
+
+	lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
+		MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP :
+		MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP;
+	return (struct mlxsw_sp_rif_ipip_lb_config){
+		.lb_ipipt = lb_ipipt,
+		.okey = mlxsw_sp_ipip_netdev_okey(ol_dev),
+		.ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
+		.saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
+						    ol_dev),
+	};
+}
+
+static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
+	.dev_type = ARPHRD_IPGRE,
+	.ul_proto = MLXSW_SP_L3_PROTO_IPV4,
+	.nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
+	.fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
+	.can_offload = mlxsw_sp_ipip_can_offload_gre4,
+	.ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
+};
+
 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
+	[MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,
 };
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
index cd986bd..1c2db83 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h
@@ -39,6 +39,7 @@
 #include <net/ip_fib.h>
 
 enum mlxsw_sp_ipip_type {
+	MLXSW_SP_IPIP_TYPE_GRE4,
 	MLXSW_SP_IPIP_TYPE_MAX,
 };
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 6068eea..f0fb898 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1020,6 +1020,32 @@ mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
 	};
 }
 
+__be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
+{
+	struct ip_tunnel *tun = netdev_priv(ol_dev);
+
+	return tun->parms.iph.daddr;
+}
+
+union mlxsw_sp_l3addr
+mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto,
+			   const struct net_device *ol_dev)
+{
+	switch (proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		return (union mlxsw_sp_l3addr) {
+			.addr4 = mlxsw_sp_ipip_netdev_daddr4(ol_dev),
+		};
+	case MLXSW_SP_L3_PROTO_IPV6:
+		break;
+	};
+
+	WARN_ON(1);
+	return (union mlxsw_sp_l3addr) {
+		.addr4 = 0,
+	};
+}
+
 static bool mlxsw_sp_l3addr_eq(const union mlxsw_sp_l3addr *addr1,
 			       const union mlxsw_sp_l3addr *addr2)
 {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
index 9632476..345fcc4 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -103,5 +103,9 @@ bool mlxsw_sp_neigh_ipv6_ignore(struct mlxsw_sp_neigh_entry *neigh_entry);
 union mlxsw_sp_l3addr
 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
 			   const struct net_device *ol_dev);
+union mlxsw_sp_l3addr
+mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto,
+			   const struct net_device *ol_dev);
+__be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev);
 
 #endif /* _MLXSW_ROUTER_H_*/
-- 
2.9.3

[patch net-next 21/21] mlxsw: reg: Add Routing Tunnel Decap Properties Register

[Jiri Pirko]

From: Petr Machata <petrm@mellanox.com>

The RTDP register is used for configuring the tunnel decap properties of
NVE and IPinIP.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 129 ++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 680bc7e..cc27c5d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -5,6 +5,7 @@
  * Copyright (c) 2015 Elad Raz <eladr@mellanox.com>
  * Copyright (c) 2015-2017 Jiri Pirko <jiri@mellanox.com>
  * Copyright (c) 2016 Yotam Gigi <yotamg@mellanox.com>
+ * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -5468,6 +5469,133 @@ static inline void mlxsw_reg_rauhtd_ent_ipv6_unpack(char *payload,
 	mlxsw_reg_rauhtd_ipv6_ent_dip_memcpy_from(payload, rec_index, p_dip);
 }
 
+/* RTDP - Routing Tunnel Decap Properties Register
+ * -----------------------------------------------
+ * The RTDP register is used for configuring the tunnel decap properties of NVE
+ * and IPinIP.
+ */
+#define MLXSW_REG_RTDP_ID 0x8020
+#define MLXSW_REG_RTDP_LEN 0x44
+
+MLXSW_REG_DEFINE(rtdp, MLXSW_REG_RTDP_ID, MLXSW_REG_RTDP_LEN);
+
+enum mlxsw_reg_rtdp_type {
+	MLXSW_REG_RTDP_TYPE_NVE,
+	MLXSW_REG_RTDP_TYPE_IPIP,
+};
+
+/* reg_rtdp_type
+ * Type of the RTDP entry as per enum mlxsw_reg_rtdp_type.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, type, 0x00, 28, 4);
+
+/* reg_rtdp_tunnel_index
+ * Index to the Decap entry.
+ * For Spectrum, Index to KVD Linear.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, rtdp, tunnel_index, 0x00, 0, 24);
+
+/* IPinIP */
+
+/* reg_rtdp_ipip_irif
+ * Ingress Router Interface for the overlay router
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_irif, 0x04, 16, 16);
+
+enum mlxsw_reg_rtdp_ipip_sip_check {
+	/* No sip checks. */
+	MLXSW_REG_RTDP_IPIP_SIP_CHECK_NO,
+	/* Filter packet if underlay is not IPv4 or if underlay SIP does not
+	 * equal ipv4_usip.
+	 */
+	MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
+	/* Filter packet if underlay is not IPv6 or if underlay SIP does not
+	 * equal ipv6_usip.
+	 */
+	MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV6 = 3,
+};
+
+/* reg_rtdp_ipip_sip_check
+ * SIP check to perform. If decapsulation failed due to these configurations
+ * then trap_id is IPIP_DECAP_ERROR.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_sip_check, 0x04, 0, 3);
+
+/* If set, allow decapsulation of IPinIP (without GRE). */
+#define MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_IPIP	BIT(0)
+/* If set, allow decapsulation of IPinGREinIP without a key. */
+#define MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE	BIT(1)
+/* If set, allow decapsulation of IPinGREinIP with a key. */
+#define MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY	BIT(2)
+
+/* reg_rtdp_ipip_type_check
+ * Flags as per MLXSW_REG_RTDP_IPIP_TYPE_CHECK_*. If decapsulation failed due to
+ * these configurations then trap_id is IPIP_DECAP_ERROR.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_type_check, 0x08, 24, 3);
+
+/* reg_rtdp_ipip_gre_key_check
+ * Whether GRE key should be checked. When check is enabled:
+ * - A packet received as IPinIP (without GRE) will always pass.
+ * - A packet received as IPinGREinIP without a key will not pass the check.
+ * - A packet received as IPinGREinIP with a key will pass the check only if the
+ *   key in the packet is equal to expected_gre_key.
+ * If decapsulation failed due to GRE key then trap_id is IPIP_DECAP_ERROR.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_gre_key_check, 0x08, 23, 1);
+
+/* reg_rtdp_ipip_ipv4_usip
+ * Underlay IPv4 address for ipv4 source address check.
+ * Reserved when sip_check is not '1'.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_ipv4_usip, 0x0C, 0, 32);
+
+/* reg_rtdp_ipip_ipv6_usip_ptr
+ * This field is valid when sip_check is "sipv6 check explicitly". This is a
+ * pointer to the IPv6 DIP which is configured by RIPS. For Spectrum, the index
+ * is to the KVD linear.
+ * Reserved when sip_check is not MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV6.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_ipv6_usip_ptr, 0x10, 0, 24);
+
+/* reg_rtdp_ipip_expected_gre_key
+ * GRE key for checking.
+ * Reserved when gre_key_check is '0'.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, rtdp, ipip_expected_gre_key, 0x14, 0, 32);
+
+static inline void mlxsw_reg_rtdp_pack(char *payload,
+				       enum mlxsw_reg_rtdp_type type,
+				       u32 tunnel_index)
+{
+	MLXSW_REG_ZERO(rtdp, payload);
+	mlxsw_reg_rtdp_type_set(payload, type);
+	mlxsw_reg_rtdp_tunnel_index_set(payload, tunnel_index);
+}
+
+static inline void
+mlxsw_reg_rtdp_ipip4_pack(char *payload, u16 irif,
+			  enum mlxsw_reg_rtdp_ipip_sip_check sip_check,
+			  unsigned int type_check, bool gre_key_check,
+			  u32 ipv4_usip, u32 expected_gre_key)
+{
+	mlxsw_reg_rtdp_ipip_irif_set(payload, irif);
+	mlxsw_reg_rtdp_ipip_sip_check_set(payload, sip_check);
+	mlxsw_reg_rtdp_ipip_type_check_set(payload, type_check);
+	mlxsw_reg_rtdp_ipip_gre_key_check_set(payload, gre_key_check);
+	mlxsw_reg_rtdp_ipip_ipv4_usip_set(payload, ipv4_usip);
+	mlxsw_reg_rtdp_ipip_expected_gre_key_set(payload, expected_gre_key);
+}
+
 /* MFCR - Management Fan Control Register
  * --------------------------------------
  * This register controls the settings of the Fan Speed PWM mechanism.
@@ -6729,6 +6857,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(rgcr),
 	MLXSW_REG(ritr),
 	MLXSW_REG(ratr),
+	MLXSW_REG(rtdp),
 	MLXSW_REG(ricnt),
 	MLXSW_REG(ralta),
 	MLXSW_REG(ralst),
-- 
2.9.3