netdev - [PATCH 06/13] net: ravb: Let IP specific receive function to interrogate descriptors

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Date: Mon, 20 Nov 2023 10:45:59 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: s.shtylyov@....ru,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	p.zabel@...gutronix.de,
	yoshihiro.shimoda.uh@...esas.com,
	geert+renesas@...der.be,
	wsa+renesas@...g-engineering.com,
	biju.das.jz@...renesas.com,
	prabhakar.mahadev-lad.rj@...renesas.com,
	sergei.shtylyov@...entembedded.com,
	mitsuhiro.kimura.kc@...esas.com,
	masaru.nagai.vx@...esas.com
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH 06/13] net: ravb: Let IP specific receive function to interrogate descriptors

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

ravb_poll() initial code used to interrogate the first descriptor of the
RX queue in case gptp is false to know if ravb_rx() should be called.
This is done for non GPTP IPs. For GPTP IPs the driver PTP specific
information was used to know if receive function should be called. As
every IP has it's own receive function that interrogates the RX descriptor
list in the same way the ravb_poll() was doing there is no need to double
check this in ravb_poll(). Removing the code form ravb_poll() and
adjusting ravb_rx_gbeth() leads to a cleaner code.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 588e3be692d3..0fc9810c5e78 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -771,12 +771,15 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
 	int limit;
 
 	entry = priv->cur_rx[q] % priv->num_rx_ring[q];
+	desc = &priv->gbeth_rx_ring[entry];
+	if (desc->die_dt == DT_FEMPTY)
+		return false;
+
 	boguscnt = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
 	stats = &priv->stats[q];
 
 	boguscnt = min(boguscnt, *quota);
 	limit = boguscnt;
-	desc = &priv->gbeth_rx_ring[entry];
 	while (desc->die_dt != DT_FEMPTY) {
 		/* Descriptor type must be checked before all other reads */
 		dma_rmb();
@@ -1279,25 +1282,16 @@ static int ravb_poll(struct napi_struct *napi, int budget)
 	struct net_device *ndev = napi->dev;
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
-	bool gptp = info->gptp || info->ccc_gac;
-	struct ravb_rx_desc *desc;
 	unsigned long flags;
 	int q = napi - priv->napi;
 	int mask = BIT(q);
 	int quota = budget;
-	unsigned int entry;
 
-	if (!gptp) {
-		entry = priv->cur_rx[q] % priv->num_rx_ring[q];
-		desc = &priv->gbeth_rx_ring[entry];
-	}
 	/* Processing RX Descriptor Ring */
 	/* Clear RX interrupt */
 	ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
-	if (gptp || desc->die_dt != DT_FEMPTY) {
-		if (ravb_rx(ndev, &quota, q))
-			goto out;
-	}
+	if (ravb_rx(ndev, &quota, q))
+		goto out;
 
 	/* Processing TX Descriptor Ring */
 	spin_lock_irqsave(&priv->lock, flags);
-- 
2.39.2