diff options
| author | Lorenzo Bianconi <lorenzo@kernel.org> | 2025-07-31 12:29:08 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-08-01 13:52:36 -0700 |
| commit | 38358fa3cc8e16c6862a3e5c5c233f9f652e3a6d (patch) | |
| tree | 870a706e68842b07cf55fbbdd8865bc41e54716b /drivers | |
| parent | f8fded7536a9350ce849f21eee124d66056aa54c (diff) | |
net: airoha: Fix PPE table access in airoha_ppe_debugfs_foe_show()
In order to avoid any possible race we need to hold the ppe_lock
spinlock accessing the hw PPE table. airoha_ppe_foe_get_entry routine is
always executed holding ppe_lock except in airoha_ppe_debugfs_foe_show
routine. Fix the problem introducing airoha_ppe_foe_get_entry_locked
routine.
Fixes: 3fe15c640f380 ("net: airoha: Introduce PPE debugfs support")
Reviewed-by: Dawid Osuchowski <dawid.osuchowski@linux.intel.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20250731-airoha_ppe_foe_get_entry_locked-v2-1-50efbd8c0fd6@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/airoha/airoha_ppe.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c index c354d536bc66..47411d2cbd28 100644 --- a/drivers/net/ethernet/airoha/airoha_ppe.c +++ b/drivers/net/ethernet/airoha/airoha_ppe.c @@ -508,9 +508,11 @@ static void airoha_ppe_foe_flow_stats_update(struct airoha_ppe *ppe, FIELD_PREP(AIROHA_FOE_IB2_NBQ, nbq); } -struct airoha_foe_entry *airoha_ppe_foe_get_entry(struct airoha_ppe *ppe, - u32 hash) +static struct airoha_foe_entry * +airoha_ppe_foe_get_entry_locked(struct airoha_ppe *ppe, u32 hash) { + lockdep_assert_held(&ppe_lock); + if (hash < PPE_SRAM_NUM_ENTRIES) { u32 *hwe = ppe->foe + hash * sizeof(struct airoha_foe_entry); struct airoha_eth *eth = ppe->eth; @@ -537,6 +539,18 @@ struct airoha_foe_entry *airoha_ppe_foe_get_entry(struct airoha_ppe *ppe, return ppe->foe + hash * sizeof(struct airoha_foe_entry); } +struct airoha_foe_entry *airoha_ppe_foe_get_entry(struct airoha_ppe *ppe, + u32 hash) +{ + struct airoha_foe_entry *hwe; + + spin_lock_bh(&ppe_lock); + hwe = airoha_ppe_foe_get_entry_locked(ppe, hash); + spin_unlock_bh(&ppe_lock); + + return hwe; +} + static bool airoha_ppe_foe_compare_entry(struct airoha_flow_table_entry *e, struct airoha_foe_entry *hwe) { @@ -651,7 +665,7 @@ airoha_ppe_foe_commit_subflow_entry(struct airoha_ppe *ppe, struct airoha_flow_table_entry *f; int type; - hwe_p = airoha_ppe_foe_get_entry(ppe, hash); + hwe_p = airoha_ppe_foe_get_entry_locked(ppe, hash); if (!hwe_p) return -EINVAL; @@ -703,7 +717,7 @@ static void airoha_ppe_foe_insert_entry(struct airoha_ppe *ppe, spin_lock_bh(&ppe_lock); - hwe = airoha_ppe_foe_get_entry(ppe, hash); + hwe = airoha_ppe_foe_get_entry_locked(ppe, hash); if (!hwe) goto unlock; @@ -818,7 +832,7 @@ airoha_ppe_foe_flow_l2_entry_update(struct airoha_ppe *ppe, u32 ib1, state; int idle; - hwe = airoha_ppe_foe_get_entry(ppe, iter->hash); + hwe = airoha_ppe_foe_get_entry_locked(ppe, iter->hash); if (!hwe) continue; @@ -855,7 +869,7 @@ static void airoha_ppe_foe_flow_entry_update(struct airoha_ppe *ppe, if (e->hash == 0xffff) goto unlock; - hwe_p = airoha_ppe_foe_get_entry(ppe, e->hash); + hwe_p = airoha_ppe_foe_get_entry_locked(ppe, e->hash); if (!hwe_p) goto unlock; |