lan743x: fix ethernet frame cutoff issue

The ethernet frame length is calculated incorrectly. Depending on
the value of RX_HEAD_PADDING, this may result in ethernet frames
that are too short (cut off at the end), or too long (garbage added
to the end).

Fix by calculating the ethernet frame length correctly. For added
clarity, use the ETH_FCS_LEN constant in the calculation.

Many thanks to Heiner Kallweit for suggesting this solution.
Suggested-by: Heiner Kallweit <hkallweit1@gmail.com>
Fixes: 3e21a10f ("lan743x: trim all 4 bytes of the FCS; not just 2")
Link: https://lore.kernel.org/lkml/20210408172353.21143-1-TheSven73@gmail.com/Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com>
Reviewed-by: George McCollister <george.mccollister@gmail.com>
Tested-by: George McCollister <george.mccollister@gmail.com>
Link: https://lore.kernel.org/r/20210409003904.8957-1-TheSven73@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/lan743x_main.c

@@ -885,8 +885,8 @@ static int lan743x_mac_set_mtu(struct lan743x_adapter *adapter, int new_mtu)
 	}
 
 	mac_rx &= ~(MAC_RX_MAX_SIZE_MASK_);
-	mac_rx |= (((new_mtu + ETH_HLEN + 4) << MAC_RX_MAX_SIZE_SHIFT_) &
-		  MAC_RX_MAX_SIZE_MASK_);
+	mac_rx |= (((new_mtu + ETH_HLEN + ETH_FCS_LEN)
+		  << MAC_RX_MAX_SIZE_SHIFT_) & MAC_RX_MAX_SIZE_MASK_);
 	lan743x_csr_write(adapter, MAC_RX, mac_rx);
 
 	if (enabled) {
@@ -1944,7 +1944,7 @@ static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index)
 	struct sk_buff *skb;
 	dma_addr_t dma_ptr;
 
-	buffer_length = netdev->mtu + ETH_HLEN + 4 + RX_HEAD_PADDING;
+	buffer_length = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + RX_HEAD_PADDING;
 
 	descriptor = &rx->ring_cpu_ptr[index];
 	buffer_info = &rx->buffer_info[index];
@@ -2040,7 +2040,7 @@ lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length)
 		dev_kfree_skb_irq(skb);
 		return NULL;
 	}
-	frame_length = max_t(int, 0, frame_length - RX_HEAD_PADDING - 4);
+	frame_length = max_t(int, 0, frame_length - ETH_FCS_LEN);
 	if (skb->len > frame_length) {
 		skb->tail -= skb->len - frame_length;
 		skb->len = frame_length;