3775b1b7f0
The DSA tagging code does not need to know about the DSA architecture, it only needs to return the slave device corresponding to the source port index (and eventually the source device index for cascade-capable switches) parsed from the frame received on the master device. For this purpose, provide an inline dsa_master_get_slave helper which validates the device and port indexes and look up the slave device. This makes the tagging rcv functions more concise and robust, and also makes dsa_get_cpu_port obsolete. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
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* Broadcom tag support
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*
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* Copyright (C) 2014 Broadcom Corporation
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "dsa_priv.h"
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/* This tag length is 4 bytes, older ones were 6 bytes, we do not
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* handle them
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*/
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#define BRCM_TAG_LEN 4
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/* Tag is constructed and desconstructed using byte by byte access
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* because the tag is placed after the MAC Source Address, which does
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* not make it 4-bytes aligned, so this might cause unaligned accesses
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* on most systems where this is used.
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*/
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/* Ingress and egress opcodes */
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#define BRCM_OPCODE_SHIFT 5
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#define BRCM_OPCODE_MASK 0x7
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/* Ingress fields */
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/* 1st byte in the tag */
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#define BRCM_IG_TC_SHIFT 2
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#define BRCM_IG_TC_MASK 0x7
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/* 2nd byte in the tag */
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#define BRCM_IG_TE_MASK 0x3
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#define BRCM_IG_TS_SHIFT 7
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/* 3rd byte in the tag */
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#define BRCM_IG_DSTMAP2_MASK 1
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#define BRCM_IG_DSTMAP1_MASK 0xff
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/* Egress fields */
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/* 2nd byte in the tag */
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#define BRCM_EG_CID_MASK 0xff
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/* 3rd byte in the tag */
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#define BRCM_EG_RC_MASK 0xff
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#define BRCM_EG_RC_RSVD (3 << 6)
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#define BRCM_EG_RC_EXCEPTION (1 << 5)
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#define BRCM_EG_RC_PROT_SNOOP (1 << 4)
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#define BRCM_EG_RC_PROT_TERM (1 << 3)
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#define BRCM_EG_RC_SWITCH (1 << 2)
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#define BRCM_EG_RC_MAC_LEARN (1 << 1)
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#define BRCM_EG_RC_MIRROR (1 << 0)
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#define BRCM_EG_TC_SHIFT 5
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#define BRCM_EG_TC_MASK 0x7
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#define BRCM_EG_PID_MASK 0x1f
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static struct sk_buff *brcm_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 queue = skb_get_queue_mapping(skb);
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u8 *brcm_tag;
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if (skb_cow_head(skb, BRCM_TAG_LEN) < 0)
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return NULL;
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skb_push(skb, BRCM_TAG_LEN);
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memmove(skb->data, skb->data + BRCM_TAG_LEN, 2 * ETH_ALEN);
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/* Build the tag after the MAC Source Address */
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brcm_tag = skb->data + 2 * ETH_ALEN;
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/* Set the ingress opcode, traffic class, tag enforcment is
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* deprecated
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*/
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brcm_tag[0] = (1 << BRCM_OPCODE_SHIFT) |
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((queue & BRCM_IG_TC_MASK) << BRCM_IG_TC_SHIFT);
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brcm_tag[1] = 0;
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brcm_tag[2] = 0;
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if (p->dp->index == 8)
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brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
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brcm_tag[3] = (1 << p->dp->index) & BRCM_IG_DSTMAP1_MASK;
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return skb;
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}
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static struct sk_buff *brcm_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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int source_port;
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u8 *brcm_tag;
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if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
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return NULL;
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/* skb->data points to the EtherType, the tag is right before it */
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brcm_tag = skb->data - 2;
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/* The opcode should never be different than 0b000 */
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if (unlikely((brcm_tag[0] >> BRCM_OPCODE_SHIFT) & BRCM_OPCODE_MASK))
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return NULL;
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/* We should never see a reserved reason code without knowing how to
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* handle it
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*/
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if (unlikely(brcm_tag[2] & BRCM_EG_RC_RSVD))
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return NULL;
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/* Locate which port this is coming from */
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source_port = brcm_tag[3] & BRCM_EG_PID_MASK;
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skb->dev = dsa_master_get_slave(dev, 0, source_port);
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if (!skb->dev)
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return NULL;
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/* Remove Broadcom tag and update checksum */
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skb_pull_rcsum(skb, BRCM_TAG_LEN);
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/* Move the Ethernet DA and SA */
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memmove(skb->data - ETH_HLEN,
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skb->data - ETH_HLEN - BRCM_TAG_LEN,
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2 * ETH_ALEN);
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return skb;
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}
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const struct dsa_device_ops brcm_netdev_ops = {
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.xmit = brcm_tag_xmit,
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.rcv = brcm_tag_rcv,
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};
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