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bcm63xx: enetsw: switch to netdev_alloc_skb_ip_align

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Increases packet processing performance by 30%.
Tested on BCM6328 320 MHz and iperf3 -M 512 for packet/sec performance.

Before:
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-30.00  sec   120 MBytes  33.7 Mbits/sec  277             sender
[  4]   0.00-30.00  sec   120 MBytes  33.5 Mbits/sec                  receiver

After:
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-30.00  sec   155 MBytes  43.3 Mbits/sec  354             sender
[  4]   0.00-30.00  sec   154 MBytes  43.1 Mbits/sec                  receiver

Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
[Merge patches, amend commit and add patch description]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Sieng Piaw Liew 2020-11-02 11:12:19 +08:00 committed by Álvaro Fernández Rojas
parent eefbcf2915
commit ba74da5b99
1 changed files with 37 additions and 0 deletions
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37
target/linux/bcm63xx/patches-5.4/441-bcm63xx_enet-alloc_rx_skb_ip_align.patch Normal file
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@ -0,0 +1,37 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Mon, 30 Nov 2020 11:07:47 +0800
Subject: [PATCH] bcm63xx: enetsw: switch to netdev_alloc_skb_ip_align
Increases packet processing performance by 30%.
Tested on BCM6328 320 MHz and iperf3 -M 512 for packet/sec performance.
Before:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
[ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
After:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 155 MBytes 43.3 Mbits/sec 354 sender
[ 4] 0.00-30.00 sec 154 MBytes 43.1 Mbits/sec receiver
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 6 +++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -239,7 +239,10 @@ static int bcm_enet_refill_rx(struct net
desc = &priv->rx_desc_cpu[desc_idx];
if (!priv->rx_skb[desc_idx]) {
- skb = netdev_alloc_skb(dev, priv->rx_skb_size);
+ if (priv->enet_is_sw)
+ skb = netdev_alloc_skb_ip_align(dev, priv->rx_skb_size);
+ else
+ skb = netdev_alloc_skb(dev, priv->rx_skb_size);
if (!skb)
break;
priv->rx_skb[desc_idx] = skb;