From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Christian Eggers ceggers@arri.de
[ Upstream commit ef3f72fee286bd270453ce2344feb7295a798508 ]
The caller (dsa_slave_xmit) guarantees that the frame length is at least ETH_ZLEN and that enough memory for tail tagging is available.
Signed-off-by: Christian Eggers ceggers@arri.de Signed-off-by: Vladimir Oltean vladimir.oltean@nxp.com Reviewed-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/dsa/tag_trailer.c | 31 ++----------------------------- 1 file changed, 2 insertions(+), 29 deletions(-)
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c index 3a1cc24a4f0a..5b97ede56a0f 100644 --- a/net/dsa/tag_trailer.c +++ b/net/dsa/tag_trailer.c @@ -13,42 +13,15 @@ static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev) { struct dsa_port *dp = dsa_slave_to_port(dev); - struct sk_buff *nskb; - int padlen; u8 *trailer;
- /* - * We have to make sure that the trailer ends up as the very - * last 4 bytes of the packet. This means that we have to pad - * the packet to the minimum ethernet frame size, if necessary, - * before adding the trailer. - */ - padlen = 0; - if (skb->len < 60) - padlen = 60 - skb->len; - - nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC); - if (!nskb) - return NULL; - skb_reserve(nskb, NET_IP_ALIGN); - - skb_reset_mac_header(nskb); - skb_set_network_header(nskb, skb_network_header(skb) - skb->head); - skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head); - skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len)); - consume_skb(skb); - - if (padlen) { - skb_put_zero(nskb, padlen); - } - - trailer = skb_put(nskb, 4); + trailer = skb_put(skb, 4); trailer[0] = 0x80; trailer[1] = 1 << dp->index; trailer[2] = 0x10; trailer[3] = 0x00;
- return nskb; + return skb; }
static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,