From: Kuniyuki Iwashima <kuniyu@google.com>
To: Andrew Lunn <andrew+netdev@lunn.ch>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@kernel.org>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
David Ahern <dsahern@kernel.org>,
Ido Schimmel <idosch@nvidia.com>
Cc: Simon Horman <horms@kernel.org>,
Kuniyuki Iwashima <kuniyu@google.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>,
netdev@vger.kernel.org, Petr Machata <petrm@nvidia.com>
Subject: [PATCH v1 net-next 5/8] mlxsw: spectrum: Resolve neigh_table right before neigh_lookup().
Date: Wed, 30 Sep 2026 20:03:13 +0000 [thread overview]
Message-ID: <20260930200326.718459-6-kuniyu@google.com> (raw)
In-Reply-To: <20260930200326.718459-1-kuniyu@google.com>
We will replace neigh_lookup() and neigh_create() with
IPv4/IPv6-specific helpers.
mlxsw has two paths where neigh_table is fetched in advance
and passed down to a function which calls neigh_lookup() and
neigh_create().
To keep the changes simple, let's prepare them beforehand
by delaying the neigh_table resolution until right before
neigh_lookup().
struct mlxsw_sp_nexthop caches neigh_tbl, so it is replaced with
family, and a new helper, mlxsw_sp_nexthop_neigh_lookup(),
resolves neigh_table and calls neigh_lookup() and neigh_create().
Similarly, mlxsw_sp_span_entry_gretap[46]_parms() now pass family
to mlxsw_sp_span_dmac() to resolve neigh_table there just before
neigh_lookup() and neigh_create().
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
Cc: Petr Machata <petrm@nvidia.com>
---
.../ethernet/mellanox/mlxsw/spectrum_router.c | 65 ++++++++++++-------
.../ethernet/mellanox/mlxsw/spectrum_span.c | 31 +++++----
2 files changed, 58 insertions(+), 38 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index f4a435885ba4..ba8a7a44ce9e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3072,9 +3072,9 @@ struct mlxsw_sp_nexthop {
* this nexthop belongs to
*/
struct rhash_head ht_node;
- struct neigh_table *neigh_tbl;
struct mlxsw_sp_nexthop_key key;
unsigned char gw_addr[sizeof(struct in6_addr)];
+ int family;
int ifindex;
int nh_weight;
int norm_nh_weight;
@@ -4300,28 +4300,49 @@ static void __mlxsw_sp_nexthop_neigh_update(struct mlxsw_sp_nexthop *nh,
nh->update = 1;
}
+static struct neighbour *
+mlxsw_sp_nexthop_neigh_lookup(struct mlxsw_sp_nexthop *nh)
+{
+ struct neigh_table *tbl;
+ struct net_device *dev;
+ struct neighbour *n;
+ struct net *net;
+
+ dev = mlxsw_sp_nexthop_dev(nh);
+ net = dev_net(dev);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (nh->family == AF_INET6)
+ tbl = nd_table(net);
+ else
+#endif
+ tbl = arp_table(net);
+
+ n = neigh_lookup(tbl, &nh->gw_addr, dev);
+ if (!n) {
+ n = neigh_create(tbl, &nh->gw_addr, dev);
+ if (!IS_ERR(n))
+ neigh_event_send(n, NULL);
+ }
+
+ return n;
+}
+
static int
mlxsw_sp_nexthop_dead_neigh_replace(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_neigh_entry *neigh_entry)
{
struct neighbour *n, *old_n = neigh_entry->key.n;
struct mlxsw_sp_nexthop *nh;
- struct net_device *dev;
bool entry_connected;
u8 nud_state, dead;
int err;
nh = list_first_entry(&neigh_entry->nexthop_list,
struct mlxsw_sp_nexthop, neigh_list_node);
- dev = mlxsw_sp_nexthop_dev(nh);
-
- n = neigh_lookup(nh->neigh_tbl, &nh->gw_addr, dev);
- if (!n) {
- n = neigh_create(nh->neigh_tbl, &nh->gw_addr, dev);
- if (IS_ERR(n))
- return PTR_ERR(n);
- neigh_event_send(n, NULL);
- }
+ n = mlxsw_sp_nexthop_neigh_lookup(nh);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
mlxsw_sp_neigh_entry_remove(mlxsw_sp, neigh_entry);
neigh_entry->key.n = n;
@@ -4402,7 +4423,6 @@ static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop *nh)
{
struct mlxsw_sp_neigh_entry *neigh_entry;
- struct net_device *dev;
struct neighbour *n;
u8 nud_state, dead;
int err;
@@ -4412,20 +4432,16 @@ static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
if (!nh->nhgi->gateway || nh->neigh_entry)
return 0;
- dev = mlxsw_sp_nexthop_dev(nh);
/* Take a reference of neigh here ensuring that neigh would
* not be destructed before the nexthop entry is finished.
* The reference is taken either in neigh_lookup() or
* in neigh_create() in case n is not found.
*/
- n = neigh_lookup(nh->neigh_tbl, &nh->gw_addr, dev);
- if (!n) {
- n = neigh_create(nh->neigh_tbl, &nh->gw_addr, dev);
- if (IS_ERR(n))
- return PTR_ERR(n);
- neigh_event_send(n, NULL);
- }
+ n = mlxsw_sp_nexthop_neigh_lookup(nh);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
+
neigh_entry = mlxsw_sp_neigh_entry_lookup(mlxsw_sp, n);
if (!neigh_entry) {
neigh_entry = mlxsw_sp_neigh_entry_create(mlxsw_sp, n);
@@ -4630,7 +4646,7 @@ static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
nh->nh_weight = 1;
#endif
memcpy(&nh->gw_addr, &fib_nh->fib_nh_gw4, sizeof(fib_nh->fib_nh_gw4));
- nh->neigh_tbl = arp_table(mlxsw_sp_net(mlxsw_sp));
+ nh->family = AF_INET;
err = mlxsw_sp_nexthop_insert(mlxsw_sp, nh);
if (err)
return err;
@@ -5120,7 +5136,6 @@ mlxsw_sp_nexthop_obj_init(struct mlxsw_sp *mlxsw_sp,
struct nh_notifier_single_info *nh_obj, int weight)
{
struct net_device *dev = nh_obj->dev;
- struct net *net = dev_net(dev);
int err;
nh->nhgi = nh_grp->nhgi;
@@ -5129,12 +5144,12 @@ mlxsw_sp_nexthop_obj_init(struct mlxsw_sp *mlxsw_sp,
switch (nh_obj->gw_family) {
case AF_INET:
memcpy(&nh->gw_addr, &nh_obj->ipv4, sizeof(nh_obj->ipv4));
- nh->neigh_tbl = arp_table(net);
+ nh->family = AF_INET;
break;
case AF_INET6:
memcpy(&nh->gw_addr, &nh_obj->ipv6, sizeof(nh_obj->ipv6));
#if IS_ENABLED(CONFIG_IPV6)
- nh->neigh_tbl = nd_table(net);
+ nh->family = AF_INET6;
#endif
break;
}
@@ -6990,7 +7005,7 @@ static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
nh->nh_weight = rt->fib6_nh->fib_nh_weight;
memcpy(&nh->gw_addr, &rt->fib6_nh->fib_nh_gw6, sizeof(nh->gw_addr));
#if IS_ENABLED(CONFIG_IPV6)
- nh->neigh_tbl = nd_table(mlxsw_sp_net(mlxsw_sp));
+ nh->family = AF_INET6;
#endif
err = mlxsw_sp_nexthop_counter_enable(mlxsw_sp, nh);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 1cd8347c274d..d34d2040177b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -224,14 +224,24 @@ struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_phys = {
.deconfigure = mlxsw_sp_span_entry_phys_deconfigure,
};
-static int mlxsw_sp_span_dmac(struct neigh_table *tbl,
+static int mlxsw_sp_span_dmac(int family,
const void *pkey,
struct net_device *dev,
unsigned char dmac[ETH_ALEN])
{
- struct neighbour *neigh = neigh_lookup(tbl, pkey, dev);
+ struct net *net = dev_net(dev);
+ struct neigh_table *tbl;
+ struct neighbour *neigh;
int err = 0;
+#if IS_ENABLED(CONFIG_IPV6_GRE)
+ if (family == AF_INET6)
+ tbl = nd_table(net);
+ else
+#endif
+ tbl = arp_table(net);
+
+ neigh = neigh_lookup(tbl, pkey, dev);
if (!neigh) {
neigh = neigh_create(tbl, pkey, dev);
if (IS_ERR(neigh))
@@ -355,8 +365,7 @@ mlxsw_sp_span_entry_tunnel_parms_common(struct net_device *edev,
union mlxsw_sp_l3addr saddr,
union mlxsw_sp_l3addr daddr,
union mlxsw_sp_l3addr gw,
- __u8 ttl,
- struct neigh_table *tbl,
+ __u8 ttl, int family,
struct mlxsw_sp_span_parms *sparmsp)
{
unsigned char dmac[ETH_ALEN];
@@ -365,7 +374,7 @@ mlxsw_sp_span_entry_tunnel_parms_common(struct net_device *edev,
if (mlxsw_sp_l3addr_is_zero(gw))
gw = daddr;
- if (!edev || mlxsw_sp_span_dmac(tbl, &gw, edev, dmac))
+ if (!edev || mlxsw_sp_span_dmac(family, &gw, edev, dmac))
goto unoffloadable;
if (is_vlan_dev(edev))
@@ -456,7 +465,6 @@ mlxsw_sp_span_entry_gretap4_parms(struct mlxsw_sp *mlxsw_sp,
bool inherit_tos = tparm.iph.tos & 0x1;
bool inherit_ttl = !tparm.iph.ttl;
union mlxsw_sp_l3addr gw = daddr;
- struct neigh_table *tbl = NULL;
struct net_device *l3edev;
if (!(to_dev->flags & IFF_UP) ||
@@ -470,11 +478,10 @@ mlxsw_sp_span_entry_gretap4_parms(struct mlxsw_sp *mlxsw_sp,
return mlxsw_sp_span_entry_unoffloadable(sparmsp);
l3edev = mlxsw_sp_span_gretap4_route(to_dev, &saddr.addr4, &gw.addr4);
- if (l3edev)
- tbl = arp_table(dev_net(l3edev));
+
return mlxsw_sp_span_entry_tunnel_parms_common(l3edev, saddr, daddr, gw,
tparm.iph.ttl,
- tbl, sparmsp);
+ AF_INET, sparmsp);
}
static int
@@ -564,7 +571,6 @@ mlxsw_sp_span_entry_gretap6_parms(struct mlxsw_sp *mlxsw_sp,
union mlxsw_sp_l3addr daddr = { .addr6 = tparm.raddr };
bool inherit_ttl = !tparm.hop_limit;
union mlxsw_sp_l3addr gw = daddr;
- struct neigh_table *tbl = NULL;
struct net_device *l3edev;
if (!(to_dev->flags & IFF_UP) ||
@@ -578,11 +584,10 @@ mlxsw_sp_span_entry_gretap6_parms(struct mlxsw_sp *mlxsw_sp,
return mlxsw_sp_span_entry_unoffloadable(sparmsp);
l3edev = mlxsw_sp_span_gretap6_route(to_dev, &saddr.addr6, &gw.addr6);
- if (l3edev)
- tbl = nd_table(dev_net(l3edev));
+
return mlxsw_sp_span_entry_tunnel_parms_common(l3edev, saddr, daddr, gw,
tparm.hop_limit,
- tbl, sparmsp);
+ AF_INET6, sparmsp);
}
static int
--
2.56.0.rc1.315.gc6ed9934b7-goog
next prev parent reply other threads:[~2026-09-30 20:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 20:03 [PATCH v1 net-next 0/8] neighbour: Add IPv4/IPv6-specific wrappers for neigh_lookup() and friends Kuniyuki Iwashima
2026-09-30 20:03 ` [PATCH v1 net-next 1/8] ipv4: Rename ipv4_neigh_lookup() to ipv4_dst_neigh_lookup() Kuniyuki Iwashima
2026-09-30 20:03 ` [PATCH v1 net-next 2/8] ipv6: Rename ip6_neigh_lookup() to __ip6_dst_neigh_lookup() Kuniyuki Iwashima
2026-09-30 20:03 ` [PATCH v1 net-next 3/8] ipv4: Add wrappers for neigh_lookup() and neigh_create() Kuniyuki Iwashima
2026-09-30 20:03 ` [PATCH v1 net-next 4/8] ipv6: Add wrappers for neigh_lookup() and (__)?neigh_create() Kuniyuki Iwashima
2026-09-30 20:03 ` Kuniyuki Iwashima [this message]
2026-09-30 20:03 ` [PATCH v1 net-next 6/8] ipv6: Use ipv6_neigh_lookup() and friends Kuniyuki Iwashima
2026-10-02 2:03 ` netdev-bot+sashiko
2026-10-02 17:01 ` Kuniyuki Iwashima
2026-09-30 20:03 ` [PATCH v1 net-next 7/8] ipv4: Use ipv4_neigh_lookup() " Kuniyuki Iwashima
2026-10-02 2:03 ` netdev-bot+sashiko
2026-09-30 20:03 ` [PATCH v1 net-next 8/8] neighbour: Remove __neigh_lookup() and __neigh_lookup_errno() Kuniyuki Iwashima
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