netdev - [PATCH net-next 3/8] bnxt_en: Process the NQ under NAPI continuous polling.

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Date:   Sun,  8 Mar 2020 18:45:49 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 3/8] bnxt_en: Process the NQ under NAPI continuous polling.

When we are in continuous NAPI polling mode, the current code in
bnxt_poll_p5() will only process the completion rings and will not
process the NQ until interrupt is re-enabled.  Tis logic works and
will not cause RX or TX starvation, but async events in the NQ may
be delayed for the duration of continuous NAPI polling.  These
async events may be firmware or VF events.

Continue to handle the NQ after we are done polling the completion
rings.  This actually simplies the code in bnxt_poll_p5().

Acknowledge the NQ so these async events will not overflow.

Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 6b4f8d8..634b1bd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -2424,14 +2424,6 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget)
 	if (cpr->has_more_work) {
 		cpr->has_more_work = 0;
 		work_done = __bnxt_poll_cqs(bp, bnapi, budget);
-		if (cpr->has_more_work) {
-			__bnxt_poll_cqs_done(bp, bnapi, DBR_TYPE_CQ);
-			return work_done;
-		}
-		__bnxt_poll_cqs_done(bp, bnapi, DBR_TYPE_CQ_ARMALL);
-		if (napi_complete_done(napi, work_done))
-			BNXT_DB_NQ_ARM_P5(&cpr->cp_db, cpr->cp_raw_cons);
-		return work_done;
 	}
 	while (1) {
 		cons = RING_CMP(raw_cons);
@@ -2468,7 +2460,10 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget)
 		raw_cons = NEXT_RAW_CMP(raw_cons);
 	}
 	__bnxt_poll_cqs_done(bp, bnapi, DBR_TYPE_CQ);
-	cpr->cp_raw_cons = raw_cons;
+	if (raw_cons != cpr->cp_raw_cons) {
+		cpr->cp_raw_cons = raw_cons;
+		BNXT_DB_NQ_P5(&cpr->cp_db, raw_cons);
+	}
 	return work_done;
 }

-- 
2.5.1