forked from mirrors/linux
f3097be21b
Meta frame reception relies on the hardware keeping its promise that it will send no other traffic towards the CPU port between a link-local frame and a meta frame. Otherwise there is no other way to associate the meta frame with the link-local frame it's holding a timestamp of. The receive function is made stateful, and buffers a timestampable frame until its meta frame arrives, then merges the two, drops the meta and releases the link-local frame up the stack. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
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*/
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/* Included by drivers/net/dsa/sja1105/sja1105.h and net/dsa/tag_sja1105.c */
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#ifndef _NET_DSA_SJA1105_H
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#define _NET_DSA_SJA1105_H
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <net/dsa.h>
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#define ETH_P_SJA1105 ETH_P_DSA_8021Q
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#define ETH_P_SJA1105_META 0x0008
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/* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */
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#define SJA1105_LINKLOCAL_FILTER_A 0x0180C2000000ull
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#define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFF000000ull
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/* IEEE 1588 Annex F: Transport of PTP over Ethernet (01:1B:19:xx:xx:xx) */
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#define SJA1105_LINKLOCAL_FILTER_B 0x011B19000000ull
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#define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFF000000ull
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/* Source and Destination MAC of follow-up meta frames.
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* Whereas the choice of SMAC only affects the unique identification of the
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* switch as sender of meta frames, the DMAC must be an address that is present
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* in the DSA master port's multicast MAC filter.
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* 01-80-C2-00-00-0E is a good choice for this, as all profiles of IEEE 1588
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* over L2 use this address for some purpose already.
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*/
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#define SJA1105_META_SMAC 0x222222222222ull
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#define SJA1105_META_DMAC 0x0180C200000Eull
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/* Global tagger data: each struct sja1105_port has a reference to
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* the structure defined in struct sja1105_private.
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*/
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struct sja1105_tagger_data {
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struct sk_buff_head skb_rxtstamp_queue;
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struct work_struct rxtstamp_work;
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struct sk_buff *stampable_skb;
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/* Protects concurrent access to the meta state machine
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* from taggers running on multiple ports on SMP systems
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*/
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spinlock_t meta_lock;
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bool hwts_rx_en;
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};
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struct sja1105_skb_cb {
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u32 meta_tstamp;
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};
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#define SJA1105_SKB_CB(skb) \
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((struct sja1105_skb_cb *)DSA_SKB_CB_PRIV(skb))
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struct sja1105_port {
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struct sja1105_tagger_data *data;
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struct dsa_port *dp;
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bool hwts_tx_en;
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int mgmt_slot;
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};
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#endif /* _NET_DSA_SJA1105_H */
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