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Miller" , Jakub Kicinski , Sven Van Asbroeck , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, George McCollister Subject: [PATCH net] lan743x: trim all 4 bytes of the FCS; not just 2 Date: Fri, 5 Mar 2021 16:24:45 -0600 Message-Id: <20210305222445.19053-1-george.mccollister@gmail.com> X-Mailer: git-send-email 2.11.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Trim all 4 bytes of the received FCS; not just 2 of them. Leaving 2 bytes of the FCS on the frame breaks DSA tailing tag drivers. Fixes: a8db76d40e4d ("lan743x: boost performance on cpu archs w/o dma cache= snooping") Signed-off-by: George McCollister --- drivers/net/ethernet/microchip/lan743x_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/et= hernet/microchip/lan743x_main.c index 334e99ffe56f..360d16965a5c 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -2040,7 +2040,7 @@ lan743x_rx_trim_skb(struct sk_buff *skb, int frame_le= ngth) dev_kfree_skb_irq(skb); return NULL; } - frame_length =3D max_t(int, 0, frame_length - RX_HEAD_PADDING - 2); + frame_length =3D max_t(int, 0, frame_length - RX_HEAD_PADDING - 4); if (skb->len > frame_length) { skb->tail -=3D skb->len - frame_length; skb->len =3D frame_length; --=20 2.11.0