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authorIdo Schimmel <idosch@mellanox.com>2016-08-17 17:39:33 +0300
committerDavid S. Miller <davem@davemloft.net>2016-08-18 02:18:27 +0300
commita94a614fa2bd32848a67f8261228e193beb826ca (patch)
tree4367bf7306d77db2956ff97e0e25fbba1dbba8cc /drivers
parentc20b80187a93b4fcc1c5c46fc8a436df1f17636d (diff)
downloadlinux-a94a614fa2bd32848a67f8261228e193beb826ca.tar.xz
mlxsw: spectrum: Trap loop-backed packets
One of the conditions to generate an ICMP Redirect Message is that "the packet is being forwarded out the same physical interface that it was received from" (RFC 1812). Therefore, we need to be able to trap such packets and let the kernel decide what to do with them. For each RIF, enable the loop-back filter, which will raise the LBERROR trap whenever the ingress RIF equals the egress RIF. Fixes: 99724c18fc66 ("mlxsw: spectrum: Introduce support for router interfaces") Reported-by: Ilan Tayari <ilant@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/reg.h10
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/spectrum.c5
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/trap.h1
3 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 7ca9201f7dcb..a1bd36cc9488 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -3383,6 +3383,15 @@ MLXSW_ITEM32(reg, ritr, ipv4_fe, 0x04, 29, 1);
*/
MLXSW_ITEM32(reg, ritr, ipv6_fe, 0x04, 28, 1);
+/* reg_ritr_lb_en
+ * Loop-back filter enable for unicast packets.
+ * If the flag is set then loop-back filter for unicast packets is
+ * implemented on the RIF. Multicast packets are always subject to
+ * loop-back filtering.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ritr, lb_en, 0x04, 24, 1);
+
/* reg_ritr_virtual_router
* Virtual router ID associated with the router interface.
* Access: RW
@@ -3484,6 +3493,7 @@ static inline void mlxsw_reg_ritr_pack(char *payload, bool enable,
mlxsw_reg_ritr_op_set(payload, op);
mlxsw_reg_ritr_rif_set(payload, rif);
mlxsw_reg_ritr_ipv4_fe_set(payload, 1);
+ mlxsw_reg_ritr_lb_en_set(payload, 1);
mlxsw_reg_ritr_mtu_set(payload, mtu);
mlxsw_reg_ritr_if_mac_memcpy_to(payload, mac);
}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 6b69c8ac7b88..8137daadb25b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2661,6 +2661,11 @@ static const struct mlxsw_rx_listener mlxsw_sp_rx_listener[] = {
{
.func = mlxsw_sp_rx_listener_func,
.local_port = MLXSW_PORT_DONT_CARE,
+ .trap_id = MLXSW_TRAP_ID_LBERROR,
+ },
+ {
+ .func = mlxsw_sp_rx_listener_func,
+ .local_port = MLXSW_PORT_DONT_CARE,
.trap_id = MLXSW_TRAP_ID_OSPF,
},
{
diff --git a/drivers/net/ethernet/mellanox/mlxsw/trap.h b/drivers/net/ethernet/mellanox/mlxsw/trap.h
index 9508e0a49e88..ed8e30186400 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/trap.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/trap.h
@@ -58,6 +58,7 @@ enum {
MLXSW_TRAP_ID_ARPUC = 0x51,
MLXSW_TRAP_ID_MTUERROR = 0x52,
MLXSW_TRAP_ID_TTLERROR = 0x53,
+ MLXSW_TRAP_ID_LBERROR = 0x54,
MLXSW_TRAP_ID_OSPF = 0x55,
MLXSW_TRAP_ID_IP2ME = 0x5F,
MLXSW_TRAP_ID_RTR_INGRESS0 = 0x70,