[PATCH] net: usb: ax88179_178a: add TSO feature

Jacky Chou
2021-11-15T03:50:42Z

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>
---
drivers/net/usb/ax88179_178a.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index c13167183..f78f48d89 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1377,11 +1377,12 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
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 |
@@ -1526,17 +1527,19 @@ ax88179_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
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);
@@ -1547,6 +1550,8 @@ ax88179_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
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;
}

--
2.25.1