[dpdk-stable] [PATCH 3/4] net/qede/base: fix GRC attention callback

[Rasesh Mody]

Treat any attention which is not for timeout event as invalid
and return status accordingly. The HW error handler logs and clears
the HW attention. Without this fix we can see flood of GRC attentions.

Fixes: e6051bd6b07d ("qede: add interrupt handling support")
Cc: stable at dpdk.org

Signed-off-by: Rasesh Mody <rasesh.mody at cavium.com>
---
 drivers/net/qede/base/ecore_int.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/qede/base/ecore_int.c b/drivers/net/qede/base/ecore_int.c
index ce8fac1..4c271d3 100644
--- a/drivers/net/qede/base/ecore_int.c
+++ b/drivers/net/qede/base/ecore_int.c
@@ -231,15 +231,19 @@ static const char *grc_timeout_attn_master_to_str(u8 master)
 
 static enum _ecore_status_t ecore_grc_attn_cb(struct ecore_hwfn *p_hwfn)
 {
+	enum _ecore_status_t rc = ECORE_SUCCESS;
 	u32 tmp, tmp2;
 
 	/* We've already cleared the timeout interrupt register, so we learn
-	 * of interrupts via the validity register
+	 * of interrupts via the validity register.
+	 * Any attention which is not for a timeout event is treated as fatal.
 	 */
 	tmp = ecore_rd(p_hwfn, p_hwfn->p_dpc_ptt,
 		       GRC_REG_TIMEOUT_ATTN_ACCESS_VALID);
-	if (!(tmp & ECORE_GRC_ATTENTION_VALID_BIT))
+	if (!(tmp & ECORE_GRC_ATTENTION_VALID_BIT)) {
+		rc = ECORE_INVAL;
 		goto out;
+	}
 
 	/* Read the GRC timeout information */
 	tmp = ecore_rd(p_hwfn, p_hwfn->p_dpc_ptt,
@@ -263,11 +267,11 @@ static enum _ecore_status_t ecore_grc_attn_cb(struct ecore_hwfn *p_hwfn)
 		  (tmp2 & ECORE_GRC_ATTENTION_VF_MASK) >>
 		  ECORE_GRC_ATTENTION_VF_SHIFT);
 
-out:
-	/* Regardles of anything else, clean the validity bit */
+	/* Clean the validity bit */
 	ecore_wr(p_hwfn, p_hwfn->p_dpc_ptt,
 		 GRC_REG_TIMEOUT_ATTN_ACCESS_VALID, 0);
-	return ECORE_SUCCESS;
+out:
+	return rc;
 }
 
 #define ECORE_PGLUE_ATTENTION_VALID (1 << 29)
-- 
1.7.10.3