openwrt/target/linux/bcm63xx/patches-5.4/046-v5.12-bcm63xx_enet-improve-rx-loop.patch
Sieng Piaw Liew 1d6f422e34 bcm63xx: sync ethernet driver with net-next
Sync ethernet driver code with upstream Linux kernel:
-Reduce xmit_more code changes.
-Combine rx cleanup code into a function.
-Convert to build_skb.
-Improve rx loop by optimizing loop tracking.

https://lore.kernel.org/netdev/20210106144208.1935-1-liew.s.piaw@gmail.com/
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
[Amend commit description, move patches to the top since they are going to be
upstreamed]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2021-01-22 12:42:30 +01:00

41 lines
1.4 KiB
Diff

From ae2259eebeacb7753e3043278957b45840123972 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:08 +0800
Subject: [PATCH 7/7] bcm63xx_enet: improve rx loop
Use existing rx processed count to track against budget, thereby making
budget decrement operation redundant.
rx_desc_count can be calculated outside the rx loop, making the loop a
bit smaller.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -340,7 +340,6 @@ static int bcm_enet_receive_queue(struct
priv->rx_curr_desc++;
if (priv->rx_curr_desc == priv->rx_ring_size)
priv->rx_curr_desc = 0;
- priv->rx_desc_count--;
/* if the packet does not have start of packet _and_
* end of packet flag set, then just recycle it */
@@ -405,9 +404,10 @@ static int bcm_enet_receive_queue(struct
dev->stats.rx_bytes += len;
list_add_tail(&skb->list, &rx_list);
- } while (--budget > 0);
+ } while (processed < budget);
netif_receive_skb_list(&rx_list);
+ priv->rx_desc_count -= processed;
if (processed || !priv->rx_desc_count) {
bcm_enet_refill_rx(dev, true);