Merge branch 'mlxsw-Small-routing-improvements'

Ido Schimmel says:

====================
mlxsw: Small routing improvements

Patch #1 switches the driver to use a unique and stable ECMP/LAG seed.
This allows for consistent behavior across reboots and avoids hash
polarization at the same time.

Patch #2 relaxes the FIB rule validation in the driver to allow the
installation of rules that direct locally generated traffic (iif=lo).
This does not result in a discrepancy between both data paths because
packets received by the device would never match such rules.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -21,7 +21,7 @@
 #include <linux/dcbnl.h>
 #include <linux/inetdevice.h>
 #include <linux/netlink.h>
-#include <linux/random.h>
+#include <linux/jhash.h>
 #include <net/switchdev.h>
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_mirred.h>
@@ -4227,7 +4227,7 @@ static int mlxsw_sp_lag_init(struct mlxsw_sp *mlxsw_sp)
 	u32 seed;
 	int err;
 
-	get_random_bytes(&seed, sizeof(seed));
+	seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
 	mlxsw_reg_slcr_pack(slcr_pl, MLXSW_REG_SLCR_LAG_HASH_SMAC |
 				     MLXSW_REG_SLCR_LAG_HASH_DMAC |
 				     MLXSW_REG_SLCR_LAG_HASH_ETHERTYPE |

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -13,9 +13,9 @@
 #include <linux/socket.h>
 #include <linux/route.h>
 #include <linux/gcd.h>
-#include <linux/random.h>
 #include <linux/if_macvlan.h>
 #include <linux/refcount.h>
+#include <linux/jhash.h>
 #include <net/netevent.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
@@ -6050,6 +6050,10 @@ static int mlxsw_sp_router_fib_rule_event(unsigned long event,
 	fr_info = container_of(info, struct fib_rule_notifier_info, info);
 	rule = fr_info->rule;
 
+	/* Rule only affects locally generated traffic */
+	if (rule->iifindex == info->net->loopback_dev->ifindex)
+		return 0;
+
 	switch (info->family) {
 	case AF_INET:
 		if (!fib4_rule_default(rule) && !rule->l3mdev)
@@ -7831,7 +7835,7 @@ static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
 	char recr2_pl[MLXSW_REG_RECR2_LEN];
 	u32 seed;
 
-	get_random_bytes(&seed, sizeof(seed));
+	seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
 	mlxsw_reg_recr2_pack(recr2_pl, seed);
 	mlxsw_sp_mp4_hash_init(recr2_pl);
 	mlxsw_sp_mp6_hash_init(recr2_pl);