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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a72808b658
Create a similar helper for locating the offset to the DSA header relative to skb->data, and make the existing EtherType header taggers to use it. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#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_port *dp = dsa_slave_to_port(dev);
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__be16 *phdr;
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u16 hdr;
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skb_push(skb, QCA_HDR_LEN);
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dsa_alloc_etype_header(skb, QCA_HDR_LEN);
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phdr = dsa_etype_header_pos_tx(skb);
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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 | BIT(dp->index);
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*phdr = htons(hdr);
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return skb;
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}
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static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
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{
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u8 ver;
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u16 hdr;
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int port;
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__be16 *phdr;
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if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
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return NULL;
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phdr = dsa_etype_header_pos_rx(skb);
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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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return NULL;
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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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dsa_strip_etype_header(skb, QCA_HDR_LEN);
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/* Get source port information */
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port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
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skb->dev = dsa_master_find_slave(dev, 0, port);
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if (!skb->dev)
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return NULL;
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return skb;
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}
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static const struct dsa_device_ops qca_netdev_ops = {
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.name = "qca",
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.proto = DSA_TAG_PROTO_QCA,
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.xmit = qca_tag_xmit,
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.rcv = qca_tag_rcv,
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.needed_headroom = QCA_HDR_LEN,
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};
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
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module_dsa_tag_driver(qca_netdev_ops);
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