Merge branch 'dsa-ll-fixes'

Vladimir Oltean says:

====================
dsa: Fix mangled link-local MAC DAs with SJA1105 DSA

The SJA1105 hardware tagging protocol is weird and will put DSA
information (source port, switch ID) in the MAC DA of the packets sent
to the CPU, and then send some additional (meta) packets which contain
the original bytes from the previous packet's MAC DA.

The tagging protocol driver contains logic to handle this, but the meta
frames are optional functionality, and there are configurations when
they aren't received (no PTP RX timestamping). Thus, the MAC DA from
packets sent to the stack is not correct in all cases.

Also, during testing it was found that the MAC DA patching procedure was
incorrect.

The investigation comes as a result of this discussion with Paolo:
https://lore.kernel.org/netdev/f494387c8d55d9b1d5a3e88beedeeb448f2e6cc3.camel@redhat.com/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 7 insertions, 48 deletions

diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index fb1549a5fe32..dee35ba924ad 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h
@@ -252,6 +252,7 @@ struct sja1105_private {
 	unsigned long ucast_egress_floods;
 	unsigned long bcast_egress_floods;
 	unsigned long hwts_tx_en;
+	unsigned long hwts_rx_en;
 	const struct sja1105_info *info;
 	size_t max_xfer_len;
 	struct spi_device *spidev;
@@ -289,7 +290,6 @@ struct sja1105_spi_message {
 /* From sja1105_main.c */
 enum sja1105_reset_reason {
 	SJA1105_VLAN_FILTERING = 0,
-	SJA1105_RX_HWTSTAMPING,
 	SJA1105_AGEING_TIME,
 	SJA1105_SCHEDULING,
 	SJA1105_BEST_EFFORT_POLICING,
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index dd154b2b9680..3529a565b4aa 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -867,11 +867,11 @@ static int sja1105_init_general_params(struct sja1105_private *priv)
 		.mac_fltres1 = SJA1105_LINKLOCAL_FILTER_A,
 		.mac_flt1    = SJA1105_LINKLOCAL_FILTER_A_MASK,
 		.incl_srcpt1 = true,
-		.send_meta1  = false,
+		.send_meta1  = true,
 		.mac_fltres0 = SJA1105_LINKLOCAL_FILTER_B,
 		.mac_flt0    = SJA1105_LINKLOCAL_FILTER_B_MASK,
 		.incl_srcpt0 = true,
-		.send_meta0  = false,
+		.send_meta0  = true,
 		/* Default to an invalid value */
 		.mirr_port = priv->ds->num_ports,
 		/* No TTEthernet */
@@ -2215,7 +2215,6 @@ static int sja1105_reload_cbs(struct sja1105_private *priv)
 
 static const char * const sja1105_reset_reasons[] = {
 	[SJA1105_VLAN_FILTERING] = "VLAN filtering",
-	[SJA1105_RX_HWTSTAMPING] = "RX timestamping",
 	[SJA1105_AGEING_TIME] = "Ageing time",
 	[SJA1105_SCHEDULING] = "Time-aware scheduling",
 	[SJA1105_BEST_EFFORT_POLICING] = "Best-effort policing",
diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.c b/drivers/net/dsa/sja1105/sja1105_ptp.c
index 30fb2cc40164..a7d41e781398 100644
--- a/drivers/net/dsa/sja1105/sja1105_ptp.c
+++ b/drivers/net/dsa/sja1105/sja1105_ptp.c
@@ -58,35 +58,10 @@ enum sja1105_ptp_clk_mode {
 #define ptp_data_to_sja1105(d) \
 		container_of((d), struct sja1105_private, ptp_data)
 
-/* Must be called only while the RX timestamping state of the tagger
- * is turned off
- */
-static int sja1105_change_rxtstamping(struct sja1105_private *priv,
-				      bool on)
-{
-	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
-	struct sja1105_general_params_entry *general_params;
-	struct sja1105_table *table;
-
-	table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS];
-	general_params = table->entries;
-	general_params->send_meta1 = on;
-	general_params->send_meta0 = on;
-
-	ptp_cancel_worker_sync(ptp_data->clock);
-	skb_queue_purge(&ptp_data->skb_txtstamp_queue);
-	skb_queue_purge(&ptp_data->skb_rxtstamp_queue);
-
-	return sja1105_static_config_reload(priv, SJA1105_RX_HWTSTAMPING);
-}
-
 int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
 {
-	struct sja1105_tagger_data *tagger_data = sja1105_tagger_data(ds);
 	struct sja1105_private *priv = ds->priv;
 	struct hwtstamp_config config;
-	bool rx_on;
-	int rc;
 
 	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 		return -EFAULT;
@@ -104,26 +79,13 @@ int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
 
 	switch (config.rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
-		rx_on = false;
+		priv->hwts_rx_en &= ~BIT(port);
 		break;
 	default:
-		rx_on = true;
+		priv->hwts_rx_en |= BIT(port);
 		break;
 	}
 
-	if (rx_on != tagger_data->rxtstamp_get_state(ds)) {
-		tagger_data->rxtstamp_set_state(ds, false);
-
-		rc = sja1105_change_rxtstamping(priv, rx_on);
-		if (rc < 0) {
-			dev_err(ds->dev,
-				"Failed to change RX timestamping: %d\n", rc);
-			return rc;
-		}
-		if (rx_on)
-			tagger_data->rxtstamp_set_state(ds, true);
-	}
-
 	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
 		return -EFAULT;
 	return 0;
@@ -131,7 +93,6 @@ int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
 
 int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
 {
-	struct sja1105_tagger_data *tagger_data = sja1105_tagger_data(ds);
 	struct sja1105_private *priv = ds->priv;
 	struct hwtstamp_config config;
 
@@ -140,7 +101,7 @@ int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
 		config.tx_type = HWTSTAMP_TX_ON;
 	else
 		config.tx_type = HWTSTAMP_TX_OFF;
-	if (tagger_data->rxtstamp_get_state(ds))
+	if (priv->hwts_rx_en & BIT(port))
 		config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 	else
 		config.rx_filter = HWTSTAMP_FILTER_NONE;
@@ -413,11 +374,10 @@ static long sja1105_rxtstamp_work(struct ptp_clock_info *ptp)
 
 bool sja1105_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)
 {
-	struct sja1105_tagger_data *tagger_data = sja1105_tagger_data(ds);
 	struct sja1105_private *priv = ds->priv;
 	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
 
-	if (!tagger_data->rxtstamp_get_state(ds))
+	if (!(priv->hwts_rx_en & BIT(port)))
 		return false;
 
 	/* We need to read the full PTP clock to reconstruct the Rx