2016-09-15 14:26:40 +00:00
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/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/etherdevice.h>
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2017-05-17 19:46:03 +00:00
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2016-09-15 14:26:40 +00:00
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#include "dsa_priv.h"
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#define QCA_HDR_LEN 2
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#define QCA_HDR_VERSION 0x2
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#define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
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#define QCA_HDR_RECV_VERSION_S 14
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#define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
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#define QCA_HDR_RECV_PRIORITY_S 11
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#define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
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#define QCA_HDR_RECV_TYPE_S 6
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#define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
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#define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
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#define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
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#define QCA_HDR_XMIT_VERSION_S 14
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#define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
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#define QCA_HDR_XMIT_PRIORITY_S 11
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#define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
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#define QCA_HDR_XMIT_CONTROL_S 8
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#define QCA_HDR_XMIT_FROM_CPU BIT(7)
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#define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
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static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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u16 *phdr, hdr;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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if (skb_cow_head(skb, 0) < 0)
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2017-06-01 20:07:15 +00:00
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return NULL;
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2016-09-15 14:26:40 +00:00
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skb_push(skb, QCA_HDR_LEN);
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memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
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phdr = (u16 *)(skb->data + 2 * ETH_ALEN);
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/* Set the version field, and set destination port information */
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hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
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QCA_HDR_XMIT_FROM_CPU |
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2017-01-27 20:29:39 +00:00
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BIT(p->dp->index);
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2016-09-15 14:26:40 +00:00
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*phdr = htons(hdr);
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return skb;
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}
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2017-04-08 15:55:23 +00:00
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static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt,
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struct net_device *orig_dev)
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2016-09-15 14:26:40 +00:00
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{
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struct dsa_switch_tree *dst = dev->dsa_ptr;
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2017-06-13 20:27:22 +00:00
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struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
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2016-09-15 14:26:40 +00:00
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struct dsa_switch *ds;
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u8 ver;
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int port;
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__be16 *phdr, hdr;
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if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
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2017-06-01 20:07:14 +00:00
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return NULL;
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2016-09-15 14:26:40 +00:00
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/* The QCA header is added by the switch between src addr and Ethertype
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* At this point, skb->data points to ethertype so header should be
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* right before
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*/
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phdr = (__be16 *)(skb->data - 2);
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hdr = ntohs(*phdr);
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/* Make sure the version is correct */
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ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
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if (unlikely(ver != QCA_HDR_VERSION))
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2017-06-01 20:07:14 +00:00
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return NULL;
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2016-09-15 14:26:40 +00:00
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/* Remove QCA tag and recalculate checksum */
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skb_pull_rcsum(skb, QCA_HDR_LEN);
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memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
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ETH_HLEN - QCA_HDR_LEN);
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/* This protocol doesn't support cascading multiple switches so it's
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* safe to assume the switch is first in the tree
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*/
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2017-06-13 20:27:22 +00:00
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ds = cpu_dp->ds;
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2016-09-15 14:26:40 +00:00
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if (!ds)
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2017-06-01 20:07:14 +00:00
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return NULL;
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2016-09-15 14:26:40 +00:00
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/* Get source port information */
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port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
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if (!ds->ports[port].netdev)
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2017-06-01 20:07:14 +00:00
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return NULL;
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2016-09-15 14:26:40 +00:00
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/* Update skb & forward the frame accordingly */
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skb->dev = ds->ports[port].netdev;
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2017-04-08 15:55:23 +00:00
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return skb;
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2016-09-15 14:26:40 +00:00
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}
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const struct dsa_device_ops qca_netdev_ops = {
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.xmit = qca_tag_xmit,
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.rcv = qca_tag_rcv,
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};
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