netdev - [PATCH] qed: Skip DORQ attention handling during recovery

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Date:   Sun, 1 Aug 2021 13:26:38 +0300
From:   Shai Malin <smalin@...vell.com>
To:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC:     <aelior@...vell.com>, <smalin@...vell.com>, <malin1024@...il.com>
Subject: [PATCH] qed: Skip DORQ attention handling during recovery

The device recovery flow will reset the entire HW device, in that case
the DORQ HW block attention is redundant.

Signed-off-by: Ariel Elior <aelior@...vell.com>
Signed-off-by: Shai Malin <smalin@...vell.com>
---
 drivers/net/ethernet/qlogic/qed/qed_int.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c
index 578935f643b8..ab6d4f737316 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_int.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_int.c
@@ -464,12 +464,19 @@ static int qed_dorq_attn_int_sts(struct qed_hwfn *p_hwfn)
 	u32 int_sts, first_drop_reason, details, address, all_drops_reason;
 	struct qed_ptt *p_ptt = p_hwfn->p_dpc_ptt;
 
+	int_sts = qed_rd(p_hwfn, p_ptt, DORQ_REG_INT_STS);
+	if (int_sts == 0xdeadbeaf) {
+		DP_NOTICE(p_hwfn->cdev,
+			  "DORQ is being reset, skipping int_sts handler\n");
+
+		return 0;
+	}
+
 	/* int_sts may be zero since all PFs were interrupted for doorbell
 	 * overflow but another one already handled it. Can abort here. If
 	 * This PF also requires overflow recovery we will be interrupted again.
 	 * The masked almost full indication may also be set. Ignoring.
 	 */
-	int_sts = qed_rd(p_hwfn, p_ptt, DORQ_REG_INT_STS);
 	if (!(int_sts & ~DORQ_REG_INT_STS_DORQ_FIFO_AFULL))
 		return 0;
 
@@ -528,6 +535,9 @@ static int qed_dorq_attn_int_sts(struct qed_hwfn *p_hwfn)
 
 static int qed_dorq_attn_cb(struct qed_hwfn *p_hwfn)
 {
+	if (p_hwfn->cdev->recov_in_prog)
+		return 0;
+
 	p_hwfn->db_recovery_info.dorq_attn = true;
 	qed_dorq_attn_overflow(p_hwfn);
 
-- 
2.22.0