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bcm63xx: batch process RX path

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Use netif_receive_skb_list to batch process skb in RX.
Tested on BCM6328 320 MHz using iperf3 -M 512, increasing performance by 12.5%.

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   136 MBytes  37.9 Mbits/sec  203             sender
[  4]   0.00-30.00  sec   135 MBytes  37.7 Mbits/sec                  receiver

Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
[Amend commit description]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Sieng Piaw Liew 2020-11-30 11:32:18 +08:00 committed by Álvaro Fernández Rojas
parent f330f991c1
commit eefbcf2915
1 changed files with 53 additions and 0 deletions
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53
target/linux/bcm63xx/patches-5.4/440-bcm63xx_enet-batch_process_RX_path.patch Normal file
View File

@ -0,0 +1,53 @@
From 1606f78dc82e4f311ca5844a0605a62cd141a072 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: batch process RX path
Use netif_receive_skb_list to batch process skb in RX.
Tested on BCM6328 320 MHz using iperf3 -M 512, increasing performance
by 12.5%.
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 136 MBytes 37.9 Mbits/sec 203 sender
[ 4] 0.00-30.00 sec 135 MBytes 37.7 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, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -301,10 +301,12 @@ static int bcm_enet_receive_queue(struct
struct bcm_enet_priv *priv;
struct device *kdev;
int processed;
+ struct list_head rx_list;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
processed = 0;
+ INIT_LIST_HEAD(&rx_list);
/* don't scan ring further than number of refilled
* descriptor */
@@ -393,10 +395,12 @@ static int bcm_enet_receive_queue(struct
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
- netif_receive_skb(skb);
+ list_add_tail(&skb->list, &rx_list);
} while (--budget > 0);
+ netif_receive_skb_list(&rx_list);
+
if (processed || !priv->rx_desc_count) {
bcm_enet_refill_rx(dev);