ipheth: fix EOVERFLOW in ipheth_rcvbulk_callback

When rx_buf is allocated we need to account for IPHETH_IP_ALIGN,
which reduces the usable size by 2 bytes. Otherwise we have 1512
bytes usable instead of 1514, and if we receive more than 1512
bytes, ipheth_rcvbulk_callback is called with status -EOVERFLOW,
after which the driver malfunctiones and all communication stops.

Resolves ipheth 2-1:4.2: ipheth_rcvbulk_callback: urb status: -75

Fixes: f33d9e2b48a3 ("usbnet: ipheth: fix connectivity with iOS 14")
Signed-off-by: Georgi Valkov <gvalkov@abv.bg>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/all/B60B8A4B-92A0-49B3-805D-809A2433B46C@abv.bg/
Link: https://lore.kernel.org/all/24851bd2769434a5fc24730dce8e8a984c5a4505.1643699778.git.jan.kiszka@siemens.com/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
index cd33955..6a769df 100644 (file)
--- a/drivers/net/usb/ipheth.c
+++ b/drivers/net/usb/ipheth.c
@@ -121,7 +121,7 @@ static int ipheth_alloc_urbs(struct ipheth_device *iphone)
        if (tx_buf == NULL)
                goto free_rx_urb;
 
-       rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
+       rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE + IPHETH_IP_ALIGN,
                                    GFP_KERNEL, &rx_urb->transfer_dma);
        if (rx_buf == NULL)
                goto free_tx_buf;
@@ -146,7 +146,7 @@ error_nomem:
 
 static void ipheth_free_urbs(struct ipheth_device *iphone)
 {
-       usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
+       usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE + IPHETH_IP_ALIGN, iphone->rx_buf,
                          iphone->rx_urb->transfer_dma);
        usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
                          iphone->tx_urb->transfer_dma);
@@ -317,7 +317,7 @@ static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
 
        usb_fill_bulk_urb(dev->rx_urb, udev,
                          usb_rcvbulkpipe(udev, dev->bulk_in),
-                         dev->rx_buf, IPHETH_BUF_SIZE,
+                         dev->rx_buf, IPHETH_BUF_SIZE + IPHETH_IP_ALIGN,
                          ipheth_rcvbulk_callback,
                          dev);
        dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;