2019-04-28 17:37:10 +00:00
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// SPDX-License-Identifier: GPL-2.0
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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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#include <linux/etherdevice.h>
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2022-02-02 00:03:22 +00:00
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#include <linux/bitfield.h>
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2022-02-02 00:03:23 +00:00
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#include <linux/dsa/tag_qca.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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static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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2017-10-16 15:12:15 +00:00
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struct dsa_port *dp = dsa_slave_to_port(dev);
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2020-07-05 19:30:08 +00:00
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__be16 *phdr;
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u16 hdr;
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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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2021-08-10 13:13:54 +00:00
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dsa_alloc_etype_header(skb, QCA_HDR_LEN);
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2021-08-10 13:13:56 +00:00
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phdr = dsa_etype_header_pos_tx(skb);
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2016-09-15 14:26:40 +00:00
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/* Set the version field, and set destination port information */
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2022-02-02 00:03:22 +00:00
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hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
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hdr |= QCA_HDR_XMIT_FROM_CPU;
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hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(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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2021-07-31 14:14:32 +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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2016-09-15 14:26:40 +00:00
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{
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2022-02-02 00:03:25 +00:00
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u8 ver, pk_type;
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2020-07-05 19:30:08 +00:00
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__be16 *phdr;
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2022-02-02 00:03:25 +00:00
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int port;
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u16 hdr;
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BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
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2016-09-15 14:26:40 +00:00
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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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2021-08-10 13:13:55 +00:00
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phdr = dsa_etype_header_pos_rx(skb);
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2016-09-15 14:26:40 +00:00
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hdr = ntohs(*phdr);
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/* Make sure the version is correct */
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2022-02-02 00:03:22 +00:00
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ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
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2016-09-15 14:26:40 +00:00
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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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2022-02-02 00:03:25 +00:00
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/* Get pk type */
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pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
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/* Ethernet MDIO read/write packet */
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if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK)
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return NULL;
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2022-02-02 00:03:26 +00:00
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/* Ethernet MIB counter packet */
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if (pk_type == QCA_HDR_RECV_TYPE_MIB)
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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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2021-08-10 13:13:53 +00:00
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dsa_strip_etype_header(skb, QCA_HDR_LEN);
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2016-09-15 14:26:40 +00:00
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/* Get source port information */
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2022-02-02 00:03:22 +00:00
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port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
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2016-09-15 14:26:40 +00:00
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2017-10-16 15:12:17 +00:00
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skb->dev = dsa_master_find_slave(dev, 0, port);
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2017-09-29 21:19:15 +00:00
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if (!skb->dev)
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return NULL;
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2016-09-15 14:26:40 +00:00
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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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2019-04-28 17:37:21 +00:00
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static const struct dsa_device_ops qca_netdev_ops = {
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2019-04-28 17:37:11 +00:00
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.name = "qca",
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2019-04-28 17:37:14 +00:00
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.proto = DSA_TAG_PROTO_QCA,
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2016-09-15 14:26:40 +00:00
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.xmit = qca_tag_xmit,
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.rcv = qca_tag_rcv,
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2021-06-11 19:01:24 +00:00
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.needed_headroom = QCA_HDR_LEN,
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2022-02-02 00:03:24 +00:00
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.promisc_on_master = true,
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2016-09-15 14:26:40 +00:00
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};
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2019-04-28 17:37:12 +00:00
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2019-04-28 17:37:13 +00:00
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MODULE_LICENSE("GPL");
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2019-04-28 17:37:12 +00:00
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
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2019-04-28 17:37:15 +00:00
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module_dsa_tag_driver(qca_netdev_ops);
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