vxlan: convert configuration to RCU protection

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Move 'struct vxlan_config' from an embedded structure inside
'struct vxlan_dev' to a dynamically allocated RCU-protected pointer
'vxlan->cfg'.

Updating configuration via vxlan_changelink() or vxlan_dev_configure()
allocates a new struct vxlan_config and publishes it with
rcu_assign_pointer(), freeing the previous config with kfree_rcu().

Readers are converted to use rcu_dereference() or rtnl_dereference().
In vxlan_xmit(), acquire rcu_read_lock() to protect config access.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260922181102.3989489-7-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Eric Dumazet 2026-09-22 18:11:00 +00:00 • committed by Jakub Kicinski

parent 0259a5f127

commit 0db0197ef9

7 changed files with 263 additions and 128 deletions

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14

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

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57

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

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274

drivers/net/vxlan/vxlan_core.c

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10

drivers/net/vxlan/vxlan_mdb.c

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12

drivers/net/vxlan/vxlan_multicast.c

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21

drivers/net/vxlan/vxlan_vnifilter.c

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3

include/net/vxlan.h

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