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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: 99724c18fc ("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>
This commit is contained in:
Ido Schimmel 2016-08-17 16:39:33 +02:00 committed by David S. Miller
parent c20b80187a
commit a94a614fa2
3 changed files with 16 additions and 0 deletions
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10
drivers/net/ethernet/mellanox/mlxsw/reg.h
View File

@ -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);
}

5
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -2658,6 +2658,11 @@ static const struct mlxsw_rx_listener mlxsw_sp_rx_listener[] = {
.local_port = MLXSW_PORT_DONT_CARE,
.trap_id = MLXSW_TRAP_ID_TTLERROR,
},
{
.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,

1
drivers/net/ethernet/mellanox/mlxsw/trap.h
View File

@ -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,