netdev - [RFC PATCH 7/7] drivers: net: bnx2: NIC driver Rx ring ECN

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Message-Id: <20230111143427.1127174-8-jgh@redhat.com>
Date:   Wed, 11 Jan 2023 14:34:27 +0000
From:   jgh@...hat.com
To:     netdev@...r.kernel.org
Cc:     Jeremy Harris <jgh@...hat.com>
Subject: [RFC PATCH 7/7] drivers: net: bnx2: NIC driver Rx ring ECN

From: Jeremy Harris <jgh@...hat.com>

Sample NIC driver support.
This is a less-preferred model, which will throttle based on the NAPI
budget rather than the receive ring fill level.

Signed-off-by: Jeremy Harris <jgh@...hat.com>
---
 drivers/net/ethernet/broadcom/bnx2.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index f55ac9c7b6fd..c7d867114234 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -3143,6 +3143,7 @@ bnx2_rx_int(struct bnx2 *bp, struct bnx2_napi *bnapi, int budget)
 {
 	u16 hw_cons, sw_cons, sw_ring_cons, sw_prod, sw_ring_prod;
 	struct bnx2_rx_ring_info *rxr = &bnapi->rx_ring;
+	int congestion_level = budget * 7 / 8;
 	int rx_pkt = 0, pg_ring_used = 0;
 	struct l2_fhdr *rx_hdr;
 
@@ -3273,6 +3274,12 @@ bnx2_rx_int(struct bnx2 *bp, struct bnx2_napi *bnapi, int budget)
 				     PKT_HASH_TYPE_L3);
 
 		skb_record_rx_queue(skb, bnapi - &bp->bnx2_napi[0]);
+
+		/* We are congested if the budget is approached
+		 */
+		if (unlikely(rx_pkt > congestion_level))
+			skb->congestion_experienced = true;
+
 		napi_gro_receive(&bnapi->napi, skb);
 		rx_pkt++;
 
-- 
2.39.0