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net: mscc: ocelot: support PTP Sync one-step timestamping 

Although HWTSTAMP_TX_ONESTEP_SYNC existed in ioctl for hardware timestamp
configuration, the PTP Sync one-step timestamping had never been supported.

This patch is to truely support it.

- ocelot_port_txtstamp_request()
  This function handles tx timestamp request by storing
  ptp_cmd(tx timestamp type) in OCELOT_SKB_CB(skb)->ptp_cmd,
  and additionally for two-step timestamp storing ts_id in
  OCELOT_SKB_CB(clone)->ptp_cmd.

- ocelot_ptp_rew_op()
  During xmit, this function is called to get rew_op (rewriter option) by
  checking skb->cb for tx timestamp request, and configure to transmitting.

Non-onestep-Sync packet with one-step timestamp request falls back to use
two-step timestamp.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2021-04-27 12:22:03 +08:00 committed by David S. Miller
parent 682eaad93e
commit 39e5308b32
6 changed files with 81 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/net/ethernet/mscc/ocelot.c
View File

@ -6,6 +6,7 @@
*/
#include <linux/dsa/ocelot.h>
#include <linux/if_bridge.h>
#include <linux/ptp_classify.h>
#include <soc/mscc/ocelot_vcap.h>
#include "ocelot.h"
#include "ocelot_vcap.h"
@ -546,6 +547,46 @@ static void ocelot_port_add_txtstamp_skb(struct ocelot *ocelot, int port,
spin_unlock(&ocelot_port->ts_id_lock);
}
u32 ocelot_ptp_rew_op(struct sk_buff *skb)
{
struct sk_buff *clone = OCELOT_SKB_CB(skb)->clone;
u8 ptp_cmd = OCELOT_SKB_CB(skb)->ptp_cmd;
u32 rew_op = 0;
if (ptp_cmd == IFH_REW_OP_TWO_STEP_PTP && clone) {
rew_op = ptp_cmd;
rew_op |= OCELOT_SKB_CB(clone)->ts_id << 3;
} else if (ptp_cmd == IFH_REW_OP_ORIGIN_PTP) {
rew_op = ptp_cmd;
}
return rew_op;
}
EXPORT_SYMBOL(ocelot_ptp_rew_op);
static bool ocelot_ptp_is_onestep_sync(struct sk_buff *skb)
{
struct ptp_header *hdr;
unsigned int ptp_class;
u8 msgtype, twostep;
ptp_class = ptp_classify_raw(skb);
if (ptp_class == PTP_CLASS_NONE)
return false;
hdr = ptp_parse_header(skb, ptp_class);
if (!hdr)
return false;
msgtype = ptp_get_msgtype(hdr, ptp_class);
twostep = hdr->flag_field[0] & 0x2;
if (msgtype == PTP_MSGTYPE_SYNC && twostep == 0)
return true;
return false;
}
int ocelot_port_txtstamp_request(struct ocelot *ocelot, int port,
struct sk_buff *skb,
struct sk_buff **clone)
@ -553,12 +594,24 @@ int ocelot_port_txtstamp_request(struct ocelot *ocelot, int port,
struct ocelot_port *ocelot_port = ocelot->ports[port];
u8 ptp_cmd = ocelot_port->ptp_cmd;
/* Store ptp_cmd in OCELOT_SKB_CB(skb)->ptp_cmd */
if (ptp_cmd == IFH_REW_OP_ORIGIN_PTP) {
if (ocelot_ptp_is_onestep_sync(skb)) {
OCELOT_SKB_CB(skb)->ptp_cmd = ptp_cmd;
return 0;
}
/* Fall back to two-step timestamping */
ptp_cmd = IFH_REW_OP_TWO_STEP_PTP;
}
if (ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
*clone = skb_clone_sk(skb);
if (!(*clone))
return -ENOMEM;
ocelot_port_add_txtstamp_skb(ocelot, port, *clone);
OCELOT_SKB_CB(skb)->ptp_cmd = ptp_cmd;
}
return 0;

8
drivers/net/ethernet/mscc/ocelot_net.c
View File

@ -514,10 +514,10 @@ static netdev_tx_t ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
rew_op = ocelot_port->ptp_cmd;
rew_op |= OCELOT_SKB_CB(clone)->ts_id << 3;
}
if (clone)
OCELOT_SKB_CB(skb)->clone = clone;
rew_op = ocelot_ptp_rew_op(skb);
}
ocelot_port_inject_frame(ocelot, port, 0, rew_op, skb);

8
include/soc/mscc/ocelot.h
View File

@ -691,6 +691,7 @@ struct ocelot_policer {
struct ocelot_skb_cb {
struct sk_buff *clone;
u8 ptp_cmd;
u8 ts_id;
};
@ -748,15 +749,16 @@ u32 __ocelot_target_read_ix(struct ocelot *ocelot, enum ocelot_target target,
void __ocelot_target_write_ix(struct ocelot *ocelot, enum ocelot_target target,
u32 val, u32 reg, u32 offset);
/* Packet I/O */
#if IS_ENABLED(CONFIG_MSCC_OCELOT_SWITCH_LIB)
/* Packet I/O */
bool ocelot_can_inject(struct ocelot *ocelot, int grp);
void ocelot_port_inject_frame(struct ocelot *ocelot, int port, int grp,
u32 rew_op, struct sk_buff *skb);
int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **skb);
void ocelot_drain_cpu_queue(struct ocelot *ocelot, int grp);
u32 ocelot_ptp_rew_op(struct sk_buff *skb);
#else
static inline bool ocelot_can_inject(struct ocelot *ocelot, int grp)
@ -780,6 +782,10 @@ static inline void ocelot_drain_cpu_queue(struct ocelot *ocelot, int grp)
{
}
static inline u32 ocelot_ptp_rew_op(struct sk_buff *skb)
{
return 0;
}
#endif
/* Hardware initialization */

2
net/dsa/Kconfig
View File

@ -111,6 +111,8 @@ config NET_DSA_TAG_RTL4_A
config NET_DSA_TAG_OCELOT
tristate "Tag driver for Ocelot family of switches, using NPI port"
depends on MSCC_OCELOT_SWITCH_LIB || \
(MSCC_OCELOT_SWITCH_LIB=n && COMPILE_TEST)
select PACKING
help
Say Y or M if you want to enable NPI tagging for the Ocelot switches

27
net/dsa/tag_ocelot.c
View File

@ -5,33 +5,14 @@
#include <soc/mscc/ocelot.h>
#include "dsa_priv.h"
static void ocelot_xmit_ptp(struct dsa_port *dp, void *injection,
struct sk_buff *clone)
{
struct ocelot *ocelot = dp->ds->priv;
struct ocelot_port *ocelot_port;
u64 rew_op;
ocelot_port = ocelot->ports[dp->index];
rew_op = ocelot_port->ptp_cmd;
/* Retrieve timestamp ID populated inside OCELOT_SKB_CB(clone)->ts_id
* by ocelot_port_add_txtstamp_skb
*/
if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
rew_op |= OCELOT_SKB_CB(clone)->ts_id << 3;
ocelot_ifh_set_rew_op(injection, rew_op);
}
static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
__be32 ifh_prefix, void **ifh)
{
struct dsa_port *dp = dsa_slave_to_port(netdev);
struct sk_buff *clone = OCELOT_SKB_CB(skb)->clone;
struct dsa_switch *ds = dp->ds;
void *injection;
__be32 *prefix;
u32 rew_op = 0;
injection = skb_push(skb, OCELOT_TAG_LEN);
prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
@ -42,9 +23,9 @@ static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
ocelot_ifh_set_src(injection, ds->num_ports);
ocelot_ifh_set_qos_class(injection, skb->priority);
/* TX timestamping was requested */
if (clone)
ocelot_xmit_ptp(dp, injection, clone);
rew_op = ocelot_ptp_rew_op(skb);
if (rew_op)
ocelot_ifh_set_rew_op(injection, rew_op);
*ifh = injection;
}

41
net/dsa/tag_ocelot_8021q.c
View File

@ -13,32 +13,6 @@
#include <soc/mscc/ocelot_ptp.h>
#include "dsa_priv.h"
static struct sk_buff *ocelot_xmit_ptp(struct dsa_port *dp,
struct sk_buff *skb,
struct sk_buff *clone)
{
struct ocelot *ocelot = dp->ds->priv;
struct ocelot_port *ocelot_port;
int port = dp->index;
u32 rew_op;
if (!ocelot_can_inject(ocelot, 0))
return NULL;
ocelot_port = ocelot->ports[port];
rew_op = ocelot_port->ptp_cmd;
/* Retrieve timestamp ID populated inside OCELOT_SKB_CB(clone)->ts_id
* by ocelot_port_add_txtstamp_skb
*/
if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
rew_op |= OCELOT_SKB_CB(clone)->ts_id << 3;
ocelot_port_inject_frame(ocelot, port, 0, rew_op, skb);
return NULL;
}
static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
@ -46,11 +20,18 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
u16 queue_mapping = skb_get_queue_mapping(skb);
u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
struct sk_buff *clone = OCELOT_SKB_CB(skb)->clone;
struct ocelot *ocelot = dp->ds->priv;
int port = dp->index;
u32 rew_op = 0;
/* TX timestamping was requested, so inject through MMIO */
if (clone)
return ocelot_xmit_ptp(dp, skb, clone);
rew_op = ocelot_ptp_rew_op(skb);
if (rew_op) {
if (!ocelot_can_inject(ocelot, 0))
return NULL;
ocelot_port_inject_frame(ocelot, port, 0, rew_op, skb);
return NULL;
}
return dsa_8021q_xmit(skb, netdev, ETH_P_8021Q,
((pcp << VLAN_PRIO_SHIFT) | tx_vid));