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kernel: backport tso for asix driver

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Performance comparison (iperf3, mtu 1500):
Before: 53.9 Mbps
After: 87.9 Mbps

The tests were performed on a BT Home Hub 5A router.
The iperf3 server was running on the router, the client
on the host.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
This commit is contained in:
Aleksander Jan Bajkowski 2022-03-07 22:31:45 +01:00 committed by Hauke Mehrtens
parent 084c20f6c5
commit bca663f20f
2 changed files with 136 additions and 0 deletions
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68
target/linux/generic/backport-5.10/797-v5.17-net-usb-ax88179_178a-add-TSO-feature.patch Normal file
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@ -0,0 +1,68 @@
From 16b1c4e01c89ba07367461e0bc4cb84993c2d027 Mon Sep 17 00:00:00 2001
From: Jacky Chou <jackychou@asix.com.tw>
Date: Mon, 15 Nov 2021 11:49:41 +0800
Subject: [PATCH] net: usb: ax88179_178a: add TSO feature
On low-effciency embedded platforms, transmission performance is poor
due to on Bulk-out with single packet.
Adding TSO feature improves the transmission performance and reduces
the number of interrupt caused by Bulk-out complete.
Reference to module, net: usb: aqc111.
Signed-off-by: Jacky Chou <jackychou@asix.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/usb/ax88179_178a.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1377,11 +1377,12 @@ static int ax88179_bind(struct usbnet *d
dev->mii.phy_id = 0x03;
dev->mii.supports_gmii = 1;
- dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
- NETIF_F_RXCSUM;
+ dev->net->features |= NETIF_F_SG | NETIF_F_IP_CSUM |
+ NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | NETIF_F_TSO;
- dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
- NETIF_F_RXCSUM;
+ dev->net->hw_features |= dev->net->features;
+
+ netif_set_gso_max_size(dev->net, 16384);
/* Enable checksum offload */
*tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
@@ -1587,17 +1588,19 @@ ax88179_tx_fixup(struct usbnet *dev, str
{
u32 tx_hdr1, tx_hdr2;
int frame_size = dev->maxpacket;
- int mss = skb_shinfo(skb)->gso_size;
int headroom;
void *ptr;
tx_hdr1 = skb->len;
- tx_hdr2 = mss;
+ tx_hdr2 = skb_shinfo(skb)->gso_size; /* Set TSO mss */
if (((skb->len + 8) % frame_size) == 0)
tx_hdr2 |= 0x80008000; /* Enable padding */
headroom = skb_headroom(skb) - 8;
+ if ((dev->net->features & NETIF_F_SG) && skb_linearize(skb))
+ return NULL;
+
if ((skb_header_cloned(skb) || headroom < 0) &&
pskb_expand_head(skb, headroom < 0 ? 8 : 0, 0, GFP_ATOMIC)) {
dev_kfree_skb_any(skb);
@@ -1608,6 +1611,8 @@ ax88179_tx_fixup(struct usbnet *dev, str
put_unaligned_le32(tx_hdr1, ptr);
put_unaligned_le32(tx_hdr2, ptr + 4);
+ usbnet_set_skb_tx_stats(skb, (skb_shinfo(skb)->gso_segs ?: 1), 0);
+
return skb;
}

68
target/linux/generic/backport-5.15/797-v5.17-net-usb-ax88179_178a-add-TSO-feature.patch Normal file
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@ -0,0 +1,68 @@
From 16b1c4e01c89ba07367461e0bc4cb84993c2d027 Mon Sep 17 00:00:00 2001
From: Jacky Chou <jackychou@asix.com.tw>
Date: Mon, 15 Nov 2021 11:49:41 +0800
Subject: [PATCH] net: usb: ax88179_178a: add TSO feature
On low-effciency embedded platforms, transmission performance is poor
due to on Bulk-out with single packet.
Adding TSO feature improves the transmission performance and reduces
the number of interrupt caused by Bulk-out complete.
Reference to module, net: usb: aqc111.
Signed-off-by: Jacky Chou <jackychou@asix.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/usb/ax88179_178a.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1377,11 +1377,12 @@ static int ax88179_bind(struct usbnet *d
dev->mii.phy_id = 0x03;
dev->mii.supports_gmii = 1;
- dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
- NETIF_F_RXCSUM;
+ dev->net->features |= NETIF_F_SG | NETIF_F_IP_CSUM |
+ NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | NETIF_F_TSO;
- dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
- NETIF_F_RXCSUM;
+ dev->net->hw_features |= dev->net->features;
+
+ netif_set_gso_max_size(dev->net, 16384);
/* Enable checksum offload */
*tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
@@ -1587,17 +1588,19 @@ ax88179_tx_fixup(struct usbnet *dev, str
{
u32 tx_hdr1, tx_hdr2;
int frame_size = dev->maxpacket;
- int mss = skb_shinfo(skb)->gso_size;
int headroom;
void *ptr;
tx_hdr1 = skb->len;
- tx_hdr2 = mss;
+ tx_hdr2 = skb_shinfo(skb)->gso_size; /* Set TSO mss */
if (((skb->len + 8) % frame_size) == 0)
tx_hdr2 |= 0x80008000; /* Enable padding */
headroom = skb_headroom(skb) - 8;
+ if ((dev->net->features & NETIF_F_SG) && skb_linearize(skb))
+ return NULL;
+
if ((skb_header_cloned(skb) || headroom < 0) &&
pskb_expand_head(skb, headroom < 0 ? 8 : 0, 0, GFP_ATOMIC)) {
dev_kfree_skb_any(skb);
@@ -1608,6 +1611,8 @@ ax88179_tx_fixup(struct usbnet *dev, str
put_unaligned_le32(tx_hdr1, ptr);
put_unaligned_le32(tx_hdr2, ptr + 4);
+ usbnet_set_skb_tx_stats(skb, (skb_shinfo(skb)->gso_segs ?: 1), 0);
+
return skb;
}