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bd954b8260
It would be nice if tagging protocol drivers could include just the header they need, since they are (mostly) data path and isolated from most of the other DSA core code does. Create a tag.c and a tag.h file which are meant to support tagging protocol drivers. 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>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
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*/
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#include <linux/bitfield.h>
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#include <linux/etherdevice.h>
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#include "tag.h"
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#define AR9331_NAME "ar9331"
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#define AR9331_HDR_LEN 2
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#define AR9331_HDR_VERSION 1
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#define AR9331_HDR_VERSION_MASK GENMASK(15, 14)
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#define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12)
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#define AR9331_HDR_TYPE_MASK GENMASK(10, 8)
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#define AR9331_HDR_BROADCAST BIT(7)
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#define AR9331_HDR_FROM_CPU BIT(6)
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/* AR9331_HDR_RESERVED - not used or may be version field.
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* According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path
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* and should be set to 0b11 to make it work.
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*/
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#define AR9331_HDR_RESERVED_MASK GENMASK(5, 4)
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#define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0)
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static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb,
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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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__le16 *phdr;
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u16 hdr;
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phdr = skb_push(skb, AR9331_HDR_LEN);
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hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION);
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hdr |= AR9331_HDR_FROM_CPU | dp->index;
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/* 0b10 for AR8216 and 0b11 for AR9331 */
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hdr |= AR9331_HDR_RESERVED_MASK;
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phdr[0] = cpu_to_le16(hdr);
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return skb;
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}
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static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb,
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struct net_device *ndev)
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{
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u8 ver, port;
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u16 hdr;
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if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN)))
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return NULL;
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hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb));
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ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr);
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if (unlikely(ver != AR9331_HDR_VERSION)) {
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netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n",
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__func__, __LINE__, hdr);
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return NULL;
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}
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if (unlikely(hdr & AR9331_HDR_FROM_CPU)) {
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netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n",
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__func__, __LINE__, hdr);
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return NULL;
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}
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skb_pull_rcsum(skb, AR9331_HDR_LEN);
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/* Get source port information */
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port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr);
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skb->dev = dsa_master_find_slave(ndev, 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 ar9331_netdev_ops = {
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.name = AR9331_NAME,
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.proto = DSA_TAG_PROTO_AR9331,
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.xmit = ar9331_tag_xmit,
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.rcv = ar9331_tag_rcv,
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.needed_headroom = AR9331_HDR_LEN,
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};
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331, AR9331_NAME);
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module_dsa_tag_driver(ar9331_netdev_ops);
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