netdev - [RFC PATCH 3/7] drivers: net: xgene: NIC driver Rx ring ECN

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Date:   Wed, 11 Jan 2023 14:34:23 +0000
From:   jgh@...hat.com
To:     netdev@...r.kernel.org
Cc:     Jeremy Harris <jgh@...hat.com>
Subject: [RFC PATCH 3/7] drivers: net: xgene: NIC driver Rx ring ECN

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

Sample NIC driver support.
This is the preferred model, usable where the driver has explicit
knowlege of the receive ring size and fill count.

Signed-off-by: Jeremy Harris <jgh@...hat.com>
---
 drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index 390671640388..4f48f5a8ea8b 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -667,7 +667,8 @@ static bool xgene_enet_errata_10GE_8(struct sk_buff *skb, u32 len, u8 status)
 
 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 			       struct xgene_enet_raw_desc *raw_desc,
-			       struct xgene_enet_raw_desc *exp_desc)
+			       struct xgene_enet_raw_desc *exp_desc,
+			       bool congestion)
 {
 	struct xgene_enet_desc_ring *buf_pool, *page_pool;
 	u32 datalen, frag_size, skb_index;
@@ -757,6 +758,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 
 	rx_ring->rx_packets++;
 	rx_ring->rx_bytes += datalen;
+	skb->congestion_experienced = congestion;
 	napi_gro_receive(&rx_ring->napi, skb);
 
 out:
@@ -814,7 +816,9 @@ static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
 			desc_count++;
 		}
 		if (is_rx_desc(raw_desc)) {
-			ret = xgene_enet_rx_frame(ring, raw_desc, exp_desc);
+			/* We are congested when the ring is 7/8'ths full
+			 */
+			ret = xgene_enet_rx_frame(ring, raw_desc, exp_desc, count > slots * 7 / 8);
 		} else {
 			ret = xgene_enet_tx_completion(ring, raw_desc);
 			is_completion = true;
-- 
2.39.0