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a32190b154
For PDelay_Resp messages we will likely have a negative value in the correction field. The switch hardware cannot correctly update such values (produces an off by one error in the UDP checksum), so it must be moved to the time stamp field in the tail tag. Format of the correction field is 48 bit ns + 16 bit fractional ns. After updating the correction field, clone is no longer required hence it is freed. Signed-off-by: Christian Eggers <ceggers@arri.de> Co-developed-by: Arun Ramadoss <arun.ramadoss@microchip.com> Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Microchip switch tag common header
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*
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* Copyright (C) 2022 Microchip Technology Inc.
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*/
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#ifndef _NET_DSA_KSZ_COMMON_H_
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#define _NET_DSA_KSZ_COMMON_H_
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#include <net/dsa.h>
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/* All time stamps from the KSZ consist of 2 bits for seconds and 30 bits for
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* nanoseconds. This is NOT the same as 32 bits for nanoseconds.
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*/
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#define KSZ_TSTAMP_SEC_MASK GENMASK(31, 30)
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#define KSZ_TSTAMP_NSEC_MASK GENMASK(29, 0)
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static inline ktime_t ksz_decode_tstamp(u32 tstamp)
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{
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u64 ns = FIELD_GET(KSZ_TSTAMP_SEC_MASK, tstamp) * NSEC_PER_SEC +
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FIELD_GET(KSZ_TSTAMP_NSEC_MASK, tstamp);
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return ns_to_ktime(ns);
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}
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struct ksz_deferred_xmit_work {
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struct dsa_port *dp;
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struct sk_buff *skb;
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struct kthread_work work;
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};
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struct ksz_tagger_data {
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void (*xmit_work_fn)(struct kthread_work *work);
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void (*hwtstamp_set_state)(struct dsa_switch *ds, bool on);
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};
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struct ksz_skb_cb {
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struct sk_buff *clone;
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unsigned int ptp_type;
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bool update_correction;
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u32 tstamp;
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};
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#define KSZ_SKB_CB(skb) \
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((struct ksz_skb_cb *)((skb)->cb))
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static inline struct ksz_tagger_data *
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ksz_tagger_data(struct dsa_switch *ds)
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{
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return ds->tagger_data;
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}
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#endif /* _NET_DSA_KSZ_COMMON_H_ */
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