eth: asix88179: packet drop when receiving large fragmented packets

The ASIX 88179A drops packets when receiving fragmented packets larger
than the MTU size due to an insufficient URB buffer size. This change
synchronizes the URB buffer size with the configuration used in the
Linux kernel, resolving the packet drop issue.

To reproduce the issue, set the following configuration:
    CONFIG_IP_DEFRAG=y
    CONFIG_TFTP_BLOCKSIZE=16352

Then, run the `tftp` command. It will fail with a timeout error:

    U-Boot> tftp zero.bin
    Using ax88179_eth device
    TFTP from server 10.0.0.196; our IP address is 10.0.0.18
    Filename 'zero.bin'
    Load address: 0x10000000
    Loading: T T T T T T T T T T T
    Retry count exceeded; starting again

Signed-off-by: Khoa Hoang <admin@khoahoang.com>
Reviewed-by: Marek Vasut <marex@denx.de>

diff --git a/drivers/usb/eth/asix88179.c b/drivers/usb/eth/asix88179.c
index 4bd353b93af844e58b51a735cf6e63976db17293..69d3073b669ab72296ab3f00b59af589a6f386ad 100644 (file)
--- a/drivers/usb/eth/asix88179.c
+++ b/drivers/usb/eth/asix88179.c
@@ -173,7 +173,7 @@
 #define USB_BULK_SEND_TIMEOUT 5000
 #define USB_BULK_RECV_TIMEOUT 5000
 
-#define AX_RX_URB_SIZE 1024 * 0x12
+#define AX_RX_URB_SIZE 1024 * 0x1a
 #define BLK_FRAME_SIZE 0x200
 #define PHY_CONNECT_TIMEOUT 5000
 #define PHY_RESET_TIMEOUT 500
@@ -193,10 +193,10 @@
 static const struct {
        unsigned char ctrl, timer_l, timer_h, size, ifg;
 } AX88179_BULKIN_SIZE[] =      {
-       {7, 0x4f, 0,    0x02, 0xff},
-       {7, 0x20, 3,    0x03, 0xff},
-       {7, 0xae, 7,    0x04, 0xff},
-       {7, 0xcc, 0x4c, 0x04, 8},
+       {7, 0x4f, 0,    0x12, 0xff},
+       {7, 0x20, 3,    0x16, 0xff},
+       {7, 0xae, 7,    0x18, 0xff},
+       {7, 0xcc, 0x4c, 0x18, 8},
 };
 
 /* driver private */
@@ -332,7 +332,7 @@ static int asix_basic_reset(struct ueth_data *dev,
        memcpy(tmp, &AX88179_BULKIN_SIZE[0], 5);
        asix_write_cmd(dev, AX_ACCESS_MAC, AX_RX_BULKIN_QCTRL, 5, 5, tmp);
 
-       dev_priv->rx_urb_size = 128 * 20;
+       dev_priv->rx_urb_size = 1024 * 20;
 
        /* Water Level configuration */
        *tmp = 0x34;