netdev - [PATCH net-next 3/9] eth: fbnic: factor out clearing the action TCAM

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Message-ID: <20250912201428.566190-4-kuba@kernel.org>
Date: Fri, 12 Sep 2025 13:14:22 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	alexanderduyck@...com,
	jacob.e.keller@...el.com,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 3/9] eth: fbnic: factor out clearing the action TCAM

We'll want to wipe the driver TCAM state after FW crash, to force
a re-programming. Factor out the clearing logic. Remove the micro-
-optimization to skip clearing the BMC entry twice, it doesn't hurt.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 drivers/net/ethernet/meta/fbnic/fbnic_rpc.c | 36 ++++++++++++---------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_rpc.c b/drivers/net/ethernet/meta/fbnic/fbnic_rpc.c
index 4284b3cb7fcc..d944d0fdd3b7 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_rpc.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_rpc.c
@@ -1124,13 +1124,25 @@ void fbnic_write_ip_addr(struct fbnic_dev *fbd)
 	}
 }
 
-void fbnic_clear_rules(struct fbnic_dev *fbd)
+static void fbnic_clear_valid_act_tcam(struct fbnic_dev *fbd)
 {
-	u32 dest = FIELD_PREP(FBNIC_RPC_ACT_TBL0_DEST_MASK,
-			      FBNIC_RPC_ACT_TBL0_DEST_BMC);
 	int i = FBNIC_RPC_TCAM_ACT_NUM_ENTRIES - 1;
 	struct fbnic_act_tcam *act_tcam;
 
+	/* Work from the bottom up deleting all other rules from hardware */
+	do {
+		act_tcam = &fbd->act_tcam[i];
+
+		if (act_tcam->state != FBNIC_TCAM_S_VALID)
+			continue;
+
+		fbnic_clear_act_tcam(fbd, i);
+		act_tcam->state = FBNIC_TCAM_S_UPDATE;
+	} while (i--);
+}
+
+void fbnic_clear_rules(struct fbnic_dev *fbd)
+{
 	/* Clear MAC rules */
 	fbnic_clear_macda(fbd);
 
@@ -1145,6 +1157,11 @@ void fbnic_clear_rules(struct fbnic_dev *fbd)
 	 * the interface back up.
 	 */
 	if (fbnic_bmc_present(fbd)) {
+		u32 dest = FIELD_PREP(FBNIC_RPC_ACT_TBL0_DEST_MASK,
+				      FBNIC_RPC_ACT_TBL0_DEST_BMC);
+		int i = FBNIC_RPC_TCAM_ACT_NUM_ENTRIES - 1;
+		struct fbnic_act_tcam *act_tcam;
+
 		act_tcam = &fbd->act_tcam[i];
 
 		if (act_tcam->state == FBNIC_TCAM_S_VALID &&
@@ -1153,21 +1170,10 @@ void fbnic_clear_rules(struct fbnic_dev *fbd)
 			wr32(fbd, FBNIC_RPC_ACT_TBL1(i), 0);
 
 			act_tcam->state = FBNIC_TCAM_S_UPDATE;
-
-			i--;
 		}
 	}
 
-	/* Work from the bottom up deleting all other rules from hardware */
-	do {
-		act_tcam = &fbd->act_tcam[i];
-
-		if (act_tcam->state != FBNIC_TCAM_S_VALID)
-			continue;
-
-		fbnic_clear_act_tcam(fbd, i);
-		act_tcam->state = FBNIC_TCAM_S_UPDATE;
-	} while (i--);
+	fbnic_clear_valid_act_tcam(fbd);
 }
 
 static void fbnic_delete_act_tcam(struct fbnic_dev *fbd, unsigned int idx)
-- 
2.51.0