On 08.04.2021 20:35, Sven Van Asbroeck wrote:
> Hi George,
>
> On Thu, Apr 8, 2021 at 2:26 PM Sven Van Asbroeck <thesve...@gmail.com> wrote:
>>
>> George, I will send a patch for you to try shortly. Except if you're
>> already ahead :)
>
> Would this work for you? It does for me.
>
> diff --git a/drivers/net/ethernet/microchip/lan743x_main.c
> b/drivers/net/ethernet/microchip/lan743x_main.c
> index dbdfabff3b00..7b6794aa8ea9 100644
> --- a/drivers/net/ethernet/microchip/lan743x_main.c
> +++ b/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;
>
A completely unrelated question:
How about VLAN packets with a 802.1Q tag? Should VLAN_ETH_HLEN be used?
> 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 - 2);
> + 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;
>
