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ethernet: intel: fix building with large NR_CPUS

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[ Upstream commit 24171a5a4a952c26568ff0d2a0bc8c4708a95e1d ]

With large values of CONFIG_NR_CPUS, three Intel ethernet drivers fail to
compile like:

In function ‘i40e_free_q_vector’,
    inlined from ‘i40e_vsi_alloc_q_vectors’ at drivers/net/ethernet/intel/i40e/i40e_main.c:12112:3:
  571 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
include/linux/rcupdate.h:1084:17: note: in expansion of macro ‘BUILD_BUG_ON’
 1084 |                 BUILD_BUG_ON(offsetof(typeof(*(ptr)), rhf) >= 4096);    \
drivers/net/ethernet/intel/i40e/i40e_main.c:5113:9: note: in expansion of macro ‘kfree_rcu’
 5113 |         kfree_rcu(q_vector, rcu);
      |         ^~~~~~~~~

The problem is that the 'rcu' member in 'q_vector' is too far from the start
of the structure. Move this member before the CPU mask instead, in all three
drivers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnd Bergmann 2025-06-20 19:31:24 +02:00 • committed by Greg Kroah-Hartman
commit 02bdbb8dc0
3 changed files with 5 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/net/ethernet/intel/fm10k/fm10k.h
View file

@ -189,13 +189,14 @@ struct fm10k_q_vector {
struct fm10k_ring_container rx, tx;
struct napi_struct napi;
struct rcu_head rcu; /* to avoid race with update stats on free */
cpumask_t affinity_mask;
char name[IFNAMSIZ + 9];
#ifdef CONFIG_DEBUG_FS
struct dentry *dbg_q_vector;
#endif /* CONFIG_DEBUG_FS */
struct rcu_head rcu; /* to avoid race with update stats on free */
/* for dynamic allocation of rings associated with this q_vector */
struct fm10k_ring ring[0] ____cacheline_internodealigned_in_smp;

2
drivers/net/ethernet/intel/i40e/i40e.h
View file

@ -864,6 +864,7 @@ struct i40e_q_vector {
u16 reg_idx; /* register index of the interrupt */
struct napi_struct napi;
struct rcu_head rcu; /* to avoid race with update stats on free */
struct i40e_ring_container rx;
struct i40e_ring_container tx;
@ -874,7 +875,6 @@ struct i40e_q_vector {
cpumask_t affinity_mask;
struct irq_affinity_notify affinity_notify;
struct rcu_head rcu; /* to avoid race with update stats on free */
char name[I40E_INT_NAME_STR_LEN];
bool arm_wb_state;
} ____cacheline_internodealigned_in_smp;

3
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View file

@ -458,9 +458,10 @@ struct ixgbe_q_vector {
struct ixgbe_ring_container rx, tx;
struct napi_struct napi;
struct rcu_head rcu; /* to avoid race with update stats on free */
cpumask_t affinity_mask;
int numa_node;
struct rcu_head rcu; /* to avoid race with update stats on free */
char name[IFNAMSIZ + 9];
/* for dynamic allocation of rings associated with this q_vector */