netdev - [PATCH net-next 07/13] bnxt_en: Add new BNXT_FLTR_INSERTED flag to bnxt_filter

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Message-Id: <20231221220218.197386-8-michael.chan@broadcom.com>
Date: Thu, 21 Dec 2023 14:02:12 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com
Subject: [PATCH net-next 07/13] bnxt_en: Add new BNXT_FLTR_INSERTED flag to bnxt_filter_base struct.

Change the unused flag to BNXT_FLTR_INSERTED.  To prepare for multiple
pathways that an ntuple filter can be deleted, we add this flag.  These
filter structures can be retreived from the RCU hash table but only
the caller that sees that the BNXT_FLTR_INSERTED flag is set can delete
the filter structure and clear the flag under spinlock.

Reviewed-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 10 ++++++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 267ffcffa2b4..16eae3bd90e5 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5343,6 +5343,10 @@ void bnxt_del_l2_filter(struct bnxt *bp, struct bnxt_l2_filter *fltr)
 	if (!atomic_dec_and_test(&fltr->refcnt))
 		return;
 	spin_lock_bh(&bp->ntp_fltr_lock);
+	if (!test_and_clear_bit(BNXT_FLTR_INSERTED, &fltr->base.state)) {
+		spin_unlock_bh(&bp->ntp_fltr_lock);
+		return;
+	}
 	hlist_del_rcu(&fltr->base.hash);
 	if (fltr->base.flags) {
 		clear_bit(fltr->base.sw_id, bp->ntp_fltr_bmap);
@@ -5489,6 +5493,7 @@ static int bnxt_init_l2_filter(struct bnxt *bp, struct bnxt_l2_filter *fltr,
 	}
 	head = &bp->l2_fltr_hash_tbl[idx];
 	hlist_add_head_rcu(&fltr->base.hash, head);
+	set_bit(BNXT_FLTR_INSERTED, &fltr->base.state);
 	atomic_set(&fltr->refcnt, 1);
 	return 0;
 }
@@ -13996,6 +14001,7 @@ static int bnxt_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 	new_fltr->base.type = BNXT_FLTR_TYPE_NTUPLE;
 	new_fltr->base.flags = BNXT_ACT_RING_DST;
 	hlist_add_head_rcu(&new_fltr->base.hash, head);
+	set_bit(BNXT_FLTR_INSERTED, &new_fltr->base.state);
 	bp->ntp_fltr_count++;
 	spin_unlock_bh(&bp->ntp_fltr_lock);
 
@@ -14042,6 +14048,10 @@ static void bnxt_cfg_ntp_filters(struct bnxt *bp)
 
 			if (del) {
 				spin_lock_bh(&bp->ntp_fltr_lock);
+				if (!test_and_clear_bit(BNXT_FLTR_INSERTED, &fltr->base.state)) {
+					spin_unlock_bh(&bp->ntp_fltr_lock);
+					continue;
+				}
 				hlist_del_rcu(&fltr->base.hash);
 				bp->ntp_fltr_count--;
 				spin_unlock_bh(&bp->ntp_fltr_lock);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 3f4e4708f7d8..867cab036e13 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1348,7 +1348,7 @@ struct bnxt_filter_base {
 	u16			vf_idx;
 	unsigned long		state;
 #define BNXT_FLTR_VALID		0
-#define BNXT_FLTR_UPDATE	1
+#define BNXT_FLTR_INSERTED	1
 
 	struct rcu_head         rcu;
 };
-- 
2.30.1


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