f81a43e8da
Now that tag drivers dynamically register, we don't need the static table. Remove it. This also means the tag driver structures can be made static. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
115 lines
2.9 KiB
C
115 lines
2.9 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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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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return NULL;
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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 | 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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struct packet_type *pt)
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{
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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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return NULL;
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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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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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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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/* 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 int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
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int *offset)
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{
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*offset = QCA_HDR_LEN;
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*proto = ((__be16 *)skb->data)[0];
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return 0;
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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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.flow_dissect = qca_tag_flow_dissect,
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.overhead = 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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