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Message-Id: <E1kDVMl-0000kL-AI@rmk-PC.armlinux.org.uk>
Date: Wed, 02 Sep 2020 17:12:07 +0100
From: Russell King <rmk+kernel@...linux.org.uk>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
Antoine Tenart <antoine.tenart@...tlin.com>,
Richard Cochran <richardcochran@...il.com>
Cc: Matteo Croce <mcroce@...hat.com>,
Andre Przywara <andre.przywara@....com>,
Sven Auhagen <sven.auhagen@...eatech.de>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH net-next 7/7] net: mvpp2: ptp: add support for transmit
timestamping
Add support for timestamping transmit packets. We allocate SYNC
messages to queue 1, every other message to queue 0.
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 48 +++++-
.../net/ethernet/marvell/mvpp2/mvpp2_main.c | 155 ++++++++++++++++--
2 files changed, 192 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 50956551b336..834775843067 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -12,6 +12,7 @@
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
+#include <linux/net_tstamp.h>
#include <linux/phy.h>
#include <linux/phylink.h>
#include <net/flow_offload.h>
@@ -804,6 +805,43 @@ enum mvpp2_prs_l3_cast {
MVPP2_PRS_L3_BROAD_CAST
};
+/* PTP descriptor constants. The low bits of the descriptor are stored
+ * separately from the high bits.
+ */
+#define MVPP22_PTP_DESC_MASK_LOW 0xfff
+
+/* PTPAction */
+enum mvpp22_ptp_action {
+ MVPP22_PTP_ACTION_NONE = 0,
+ MVPP22_PTP_ACTION_FORWARD = 1,
+ MVPP22_PTP_ACTION_CAPTURE = 3,
+ /* The following have not been verified */
+ MVPP22_PTP_ACTION_ADDTIME = 4,
+ MVPP22_PTP_ACTION_ADDCORRECTEDTIME = 5,
+ MVPP22_PTP_ACTION_CAPTUREADDTIME = 6,
+ MVPP22_PTP_ACTION_CAPTUREADDCORRECTEDTIME = 7,
+ MVPP22_PTP_ACTION_ADDINGRESSTIME = 8,
+ MVPP22_PTP_ACTION_CAPTUREADDINGRESSTIME = 9,
+ MVPP22_PTP_ACTION_CAPTUREINGRESSTIME = 10,
+};
+
+/* PTPPacketFormat */
+enum mvpp22_ptp_packet_format {
+ MVPP22_PTP_PKT_FMT_PTPV2 = 0,
+ MVPP22_PTP_PKT_FMT_PTPV1 = 1,
+ MVPP22_PTP_PKT_FMT_Y1731 = 2,
+ MVPP22_PTP_PKT_FMT_NTPTS = 3,
+ MVPP22_PTP_PKT_FMT_NTPRX = 4,
+ MVPP22_PTP_PKT_FMT_NTPTX = 5,
+ MVPP22_PTP_PKT_FMT_TWAMP = 6,
+};
+
+#define MVPP22_PTP_ACTION(x) (((x) & 15) << 0)
+#define MVPP22_PTP_PACKETFORMAT(x) (((x) & 7) << 4)
+#define MVPP22_PTP_MACTIMESTAMPINGEN BIT(11)
+#define MVPP22_PTP_TIMESTAMPENTRYID(x) (((x) & 31) << 12)
+#define MVPP22_PTP_TIMESTAMPQUEUESELECT BIT(18)
+
/* BM constants */
#define MVPP2_BM_JUMBO_BUF_NUM 512
#define MVPP2_BM_LONG_BUF_NUM 1024
@@ -1022,6 +1060,11 @@ struct mvpp2_ethtool_fs {
struct ethtool_rxnfc rxnfc;
};
+struct mvpp2_hwtstamp_queue {
+ struct sk_buff *skb[32];
+ u8 next;
+};
+
struct mvpp2_port {
u8 id;
@@ -1108,6 +1151,8 @@ struct mvpp2_port {
bool hwtstamp;
bool rx_hwtstamp;
+ enum hwtstamp_tx_types tx_hwtstamp_type;
+ struct mvpp2_hwtstamp_queue tx_hwtstamp_queue[2];
};
/* The mvpp2_tx_desc and mvpp2_rx_desc structures describe the
@@ -1176,7 +1221,8 @@ struct mvpp22_tx_desc {
u8 packet_offset;
u8 phys_txq;
__le16 data_size;
- __le64 reserved1;
+ __le32 ptp_descriptor;
+ __le32 reserved2;
__le64 buf_dma_addr_ptp;
__le64 buf_cookie_misc;
};
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index f3148e033bfe..7130e31c7431 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -28,6 +28,7 @@
#include <linux/phy.h>
#include <linux/phylink.h>
#include <linux/phy/phy.h>
+#include <linux/ptp_classify.h>
#include <linux/clk.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
@@ -2984,13 +2985,19 @@ static irqreturn_t mvpp2_isr(int irq, void *dev_id)
static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
{
+ struct skb_shared_hwtstamps shhwtstamps;
+ struct mvpp2_hwtstamp_queue *queue;
+ struct sk_buff *skb;
void __iomem *ptp_q;
+ unsigned int id;
u32 r0, r1, r2;
ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
if (nq)
ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
+ queue = &port->tx_hwtstamp_queue[nq];
+
while (1) {
r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
if (!r0)
@@ -2998,6 +3005,18 @@ static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
+
+ id = (r0 >> 1) & 31;
+
+ skb = queue->skb[id];
+ queue->skb[id] = NULL;
+ if (skb) {
+ u32 ts = r2 << 19 | r1 << 3 | r0 >> 13;
+
+ mvpp22_tai_tstamp(port->priv->tai, ts, &shhwtstamps);
+ skb_tstamp_tx(skb, &shhwtstamps);
+ dev_kfree_skb_any(skb);
+ }
}
}
@@ -3654,6 +3673,92 @@ tx_desc_unmap_put(struct mvpp2_port *port, struct mvpp2_tx_queue *txq,
mvpp2_txq_desc_put(txq);
}
+static void mvpp2_txdesc_clear_ptp(struct mvpp2_port *port,
+ struct mvpp2_tx_desc *desc)
+{
+ /* We only need to clear the low bits */
+ if (port->priv->hw_version != MVPP21)
+ desc->pp22.ptp_descriptor &=
+ cpu_to_le32(~MVPP22_PTP_DESC_MASK_LOW);
+}
+
+static bool mvpp2_tx_hw_tstamp(struct mvpp2_port *port,
+ struct mvpp2_tx_desc *tx_desc,
+ struct sk_buff *skb)
+{
+ struct mvpp2_hwtstamp_queue *queue;
+ unsigned int mtype, type, i;
+ struct ptp_header *hdr;
+ u64 ptpdesc;
+
+ if (port->priv->hw_version == MVPP21 ||
+ port->tx_hwtstamp_type == HWTSTAMP_TX_OFF)
+ return false;
+
+ type = ptp_classify_raw(skb);
+ if (!type)
+ return false;
+
+ hdr = ptp_parse_header(skb, type);
+ if (!hdr)
+ return false;
+
+ ptpdesc = MVPP22_PTP_MACTIMESTAMPINGEN |
+ MVPP22_PTP_ACTION_CAPTURE;
+ queue = &port->tx_hwtstamp_queue[0];
+
+ switch (type & PTP_CLASS_VMASK) {
+ case PTP_CLASS_V1:
+ ptpdesc |= MVPP22_PTP_PACKETFORMAT(MVPP22_PTP_PKT_FMT_PTPV1);
+ break;
+
+ case PTP_CLASS_V2:
+ ptpdesc |= MVPP22_PTP_PACKETFORMAT(MVPP22_PTP_PKT_FMT_PTPV2);
+ mtype = hdr->tsmt & 15;
+ /* Direct PTP Sync messages to queue 1 */
+ if (mtype == 0) {
+ ptpdesc |= MVPP22_PTP_TIMESTAMPQUEUESELECT;
+ queue = &port->tx_hwtstamp_queue[1];
+ }
+ break;
+ }
+
+ /* Take a reference on the skb and insert into our queue */
+ i = queue->next;
+ queue->next = (i + 1) & 31;
+ if (queue->skb[i])
+ dev_kfree_skb_any(queue->skb[i]);
+ queue->skb[i] = skb_get(skb);
+
+ ptpdesc |= MVPP22_PTP_TIMESTAMPENTRYID(i);
+
+ /*
+ * 3:0 - PTPAction
+ * 6:4 - PTPPacketFormat
+ * 7 - PTP_CF_WraparoundCheckEn
+ * 9:8 - IngressTimestampSeconds[1:0]
+ * 10 - Reserved
+ * 11 - MACTimestampingEn
+ * 17:12 - PTP_TimestampQueueEntryID[5:0]
+ * 18 - PTPTimestampQueueSelect
+ * 19 - UDPChecksumUpdateEn
+ * 27:20 - TimestampOffset
+ * PTP, NTPTransmit, OWAMP/TWAMP - L3 to PTP header
+ * NTPTs, Y.1731 - L3 to timestamp entry
+ * 35:28 - UDP Checksum Offset
+ *
+ * stored in tx descriptor bits 75:64 (11:0) and 191:168 (35:12)
+ */
+ tx_desc->pp22.ptp_descriptor &=
+ cpu_to_le32(~MVPP22_PTP_DESC_MASK_LOW);
+ tx_desc->pp22.ptp_descriptor |=
+ cpu_to_le32(ptpdesc & MVPP22_PTP_DESC_MASK_LOW);
+ tx_desc->pp22.buf_dma_addr_ptp &= cpu_to_le64(~0xffffff0000000000ULL);
+ tx_desc->pp22.buf_dma_addr_ptp |= cpu_to_le64((ptpdesc >> 12) << 40);
+
+ return true;
+}
+
/* Handle tx fragmentation processing */
static int mvpp2_tx_frag_process(struct mvpp2_port *port, struct sk_buff *skb,
struct mvpp2_tx_queue *aggr_txq,
@@ -3670,6 +3775,7 @@ static int mvpp2_tx_frag_process(struct mvpp2_port *port, struct sk_buff *skb,
void *addr = skb_frag_address(frag);
tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
+ mvpp2_txdesc_clear_ptp(port, tx_desc);
mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
mvpp2_txdesc_size_set(port, tx_desc, skb_frag_size(frag));
@@ -3719,6 +3825,7 @@ static inline void mvpp2_tso_put_hdr(struct sk_buff *skb,
struct mvpp2_tx_desc *tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
dma_addr_t addr;
+ mvpp2_txdesc_clear_ptp(port, tx_desc);
mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
mvpp2_txdesc_size_set(port, tx_desc, hdr_sz);
@@ -3743,6 +3850,7 @@ static inline int mvpp2_tso_put_data(struct sk_buff *skb,
struct mvpp2_tx_desc *tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
dma_addr_t buf_dma_addr;
+ mvpp2_txdesc_clear_ptp(port, tx_desc);
mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
mvpp2_txdesc_size_set(port, tx_desc, sz);
@@ -3859,6 +3967,9 @@ static netdev_tx_t mvpp2_tx(struct sk_buff *skb, struct net_device *dev)
/* Get a descriptor for the first part of the packet */
tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
+ if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ||
+ !mvpp2_tx_hw_tstamp(port, tx_desc, skb))
+ mvpp2_txdesc_clear_ptp(port, tx_desc);
mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
mvpp2_txdesc_size_set(port, tx_desc, skb_headlen(skb));
@@ -4618,6 +4729,7 @@ static int mvpp2_set_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
{
struct hwtstamp_config config;
void __iomem *ptp;
+ u32 gcr, int_mask;
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
@@ -4625,30 +4737,51 @@ static int mvpp2_set_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
if (config.flags)
return -EINVAL;
- if (config.tx_type != HWTSTAMP_TX_OFF)
+ if (config.tx_type != HWTSTAMP_TX_OFF &&
+ config.tx_type != HWTSTAMP_TX_ON)
return -ERANGE;
ptp = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
+
+ int_mask = gcr = 0;
+ if (config.tx_type != HWTSTAMP_TX_OFF) {
+ gcr |= MVPP22_PTP_GCR_TSU_ENABLE | MVPP22_PTP_GCR_TX_RESET;
+ int_mask |= MVPP22_PTP_INT_MASK_QUEUE1 |
+ MVPP22_PTP_INT_MASK_QUEUE0;
+ }
+
+ /* It seems we must also release the TX reset when enabling the TSU */
+ if (config.rx_filter != HWTSTAMP_FILTER_NONE)
+ gcr |= MVPP22_PTP_GCR_TSU_ENABLE | MVPP22_PTP_GCR_RX_RESET |
+ MVPP22_PTP_GCR_TX_RESET;
+
+ if (gcr & MVPP22_PTP_GCR_TSU_ENABLE)
+ mvpp22_tai_start(port->priv->tai);
+
if (config.rx_filter != HWTSTAMP_FILTER_NONE) {
config.rx_filter = HWTSTAMP_FILTER_ALL;
- mvpp22_tai_start(port->priv->tai);
mvpp2_modify(ptp + MVPP22_PTP_GCR,
MVPP22_PTP_GCR_RX_RESET |
MVPP22_PTP_GCR_TX_RESET |
- MVPP22_PTP_GCR_TSU_ENABLE,
- MVPP22_PTP_GCR_RX_RESET |
- MVPP22_PTP_GCR_TX_RESET |
- MVPP22_PTP_GCR_TSU_ENABLE);
+ MVPP22_PTP_GCR_TSU_ENABLE, gcr);
port->rx_hwtstamp = true;
} else {
port->rx_hwtstamp = false;
mvpp2_modify(ptp + MVPP22_PTP_GCR,
MVPP22_PTP_GCR_RX_RESET |
MVPP22_PTP_GCR_TX_RESET |
- MVPP22_PTP_GCR_TSU_ENABLE, 0);
- mvpp22_tai_stop(port->priv->tai);
+ MVPP22_PTP_GCR_TSU_ENABLE, gcr);
}
+ mvpp2_modify(ptp + MVPP22_PTP_INT_MASK,
+ MVPP22_PTP_INT_MASK_QUEUE1 |
+ MVPP22_PTP_INT_MASK_QUEUE0, int_mask);
+
+ if (!(gcr & MVPP22_PTP_GCR_TSU_ENABLE))
+ mvpp22_tai_stop(port->priv->tai);
+
+ port->tx_hwtstamp_type = config.tx_type;
+
if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
return -EFAULT;
@@ -4661,7 +4794,7 @@ static int mvpp2_get_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
memset(&config, 0, sizeof(config));
- config.tx_type = HWTSTAMP_TX_OFF;
+ config.tx_type = port->tx_hwtstamp_type;
config.rx_filter = port->rx_hwtstamp ?
HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE;
@@ -4683,9 +4816,11 @@ static int mvpp2_ethtool_get_ts_info(struct net_device *dev,
info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE |
+ SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
- info->tx_types = BIT(HWTSTAMP_TX_OFF);
+ info->tx_types = BIT(HWTSTAMP_TX_OFF) |
+ BIT(HWTSTAMP_TX_ON);
info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
BIT(HWTSTAMP_FILTER_ALL);
--
2.20.1
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