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Message-Id: <1450355735-30846-4-git-send-email-saeedm@mellanox.com>
Date: Thu, 17 Dec 2015 14:35:34 +0200
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
Eran Ben Elisha <eranbe@...lanox.com>,
Tal Alon <talal@...lanox.com>,
Richard Cochran <richardcochran@...il.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net-next V1 3/4] net/mlx5e: Add HW timestamping (TS) support
From: Eran Ben Elisha <eranbe@...lanox.com>
Add support for enable/disable HW timestamping for incoming and/or
outgoing packets. To enable/disable HW timestamping appropriate
ioctl should be used. Currently HWTSTAMP_FILTER_ALL/NONE and
HWTSAMP_TX_ON/OFF only are supported. Make all relevant changes in
RX/TX flows to consider TS request and plant HW timestamps into
relevant structures.
Add internal clock for converting hardware timestamp to nanoseconds. In
addition, add a service task to catch internal clock overflow, to make
sure timestamping is accurate.
Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en.h | 21 ++++
drivers/net/ethernet/mellanox/mlx5/core/en_clock.c | 119 ++++++++++++++++++++
.../net/ethernet/mellanox/mlx5/core/en_ethtool.c | 29 +++++
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 101 ++++++++++++++++-
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 9 ++
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c | 14 +++
7 files changed, 293 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index fe11e96..01c0256 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -5,4 +5,4 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
mad.o transobj.o vport.o sriov.o fs_cmd.o fs_core.o
mlx5_core-$(CONFIG_MLX5_CORE_EN) += wq.o eswitch.o \
en_main.o en_fs.o en_ethtool.o en_tx.o en_rx.o \
- en_txrx.o
+ en_txrx.o en_clock.o
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index f689ce5..84e65a5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -32,6 +32,8 @@
#include <linux/if_vlan.h>
#include <linux/etherdevice.h>
+#include <linux/timecounter.h>
+#include <linux/net_tstamp.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/qp.h>
#include <linux/mlx5/cq.h>
@@ -63,6 +65,7 @@
#define MLX5E_TX_CQ_POLL_BUDGET 128
#define MLX5E_UPDATE_STATS_INTERVAL 200 /* msecs */
#define MLX5E_SQ_BF_BUDGET 16
+#define MLX5E_SERVICE_TASK_DELAY (HZ / 4)
#define MLX5E_NUM_MAIN_GROUPS 9
@@ -486,6 +489,16 @@ struct mlx5e_flow_tables {
struct mlx5e_flow_table main;
};
+struct mlx5e_tstamp {
+ rwlock_t lock;
+ struct cyclecounter cycles;
+ struct timecounter clock;
+ struct hwtstamp_config hwtstamp_config;
+ u32 nominal_c_mult;
+ unsigned long last_overflow_check;
+ unsigned long overflow_period;
+};
+
struct mlx5e_priv {
/* priv data path fields - start */
int default_vlan_prio;
@@ -515,10 +528,12 @@ struct mlx5e_priv {
struct work_struct update_carrier_work;
struct work_struct set_rx_mode_work;
struct delayed_work update_stats_work;
+ struct delayed_work service_task;
struct mlx5_core_dev *mdev;
struct net_device *netdev;
struct mlx5e_stats stats;
+ struct mlx5e_tstamp tstamp;
};
#define MLX5E_NET_IP_ALIGN 2
@@ -585,6 +600,12 @@ void mlx5e_destroy_flow_tables(struct mlx5e_priv *priv);
void mlx5e_init_eth_addr(struct mlx5e_priv *priv);
void mlx5e_set_rx_mode_work(struct work_struct *work);
+void mlx5e_fill_hwstamp(struct mlx5e_tstamp *clock,
+ struct skb_shared_hwtstamps *hwts,
+ u64 timestamp);
+void mlx5e_timestamp_overflow_check(struct mlx5e_priv *priv);
+void mlx5e_timestamp_init(struct mlx5e_priv *priv);
+
int mlx5e_vlan_rx_add_vid(struct net_device *dev, __always_unused __be16 proto,
u16 vid);
int mlx5e_vlan_rx_kill_vid(struct net_device *dev, __always_unused __be16 proto,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c b/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
new file mode 100644
index 0000000..9bc0058
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_clock.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/clocksource.h>
+#include "en.h"
+
+enum {
+ MLX5E_CYCLES_SHIFT = 23
+};
+
+void mlx5e_fill_hwstamp(struct mlx5e_tstamp *tstamp,
+ struct skb_shared_hwtstamps *hwts,
+ u64 timestamp)
+{
+ unsigned long flags;
+ u64 nsec;
+
+ memset(hwts, 0, sizeof(struct skb_shared_hwtstamps));
+ read_lock_irqsave(&tstamp->lock, flags);
+ nsec = timecounter_cyc2time(&tstamp->clock, timestamp);
+ read_unlock_irqrestore(&tstamp->lock, flags);
+
+ hwts->hwtstamp = ns_to_ktime(nsec);
+}
+
+static cycle_t mlx5e_read_clock(const struct cyclecounter *cc)
+{
+ struct mlx5e_tstamp *tstamp = container_of(cc, struct mlx5e_tstamp,
+ cycles);
+ struct mlx5e_priv *priv = container_of(tstamp, struct mlx5e_priv,
+ tstamp);
+
+ return mlx5_core_read_clock(priv->mdev) & cc->mask;
+}
+
+void mlx5e_timestamp_overflow_check(struct mlx5e_priv *priv)
+{
+ bool timeout = time_is_before_jiffies(priv->tstamp.last_overflow_check +
+ priv->tstamp.overflow_period);
+ unsigned long flags;
+
+ if (timeout) {
+ write_lock_irqsave(&priv->tstamp.lock, flags);
+ timecounter_read(&priv->tstamp.clock);
+ write_unlock_irqrestore(&priv->tstamp.lock, flags);
+ priv->tstamp.last_overflow_check = jiffies;
+ }
+}
+
+static void mlx5e_timestamp_init_config(struct mlx5e_tstamp *tstamp)
+{
+ tstamp->hwtstamp_config.flags = 0;
+ tstamp->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
+ tstamp->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
+}
+
+void mlx5e_timestamp_init(struct mlx5e_priv *priv)
+{
+ struct mlx5e_tstamp *tstamp = &priv->tstamp;
+ u64 ns;
+ u64 frac = 0;
+ u32 dev_freq;
+
+ mlx5e_timestamp_init_config(tstamp);
+ dev_freq = MLX5_CAP_GEN(priv->mdev, device_frequency_khz);
+ if (!dev_freq) {
+ mlx5_core_warn(priv->mdev, "invalid device_frequency_khz. %s failed\n",
+ __func__);
+ return;
+ }
+ rwlock_init(&tstamp->lock);
+ memset(&tstamp->cycles, 0, sizeof(tstamp->cycles));
+ tstamp->cycles.read = mlx5e_read_clock;
+ tstamp->cycles.shift = MLX5E_CYCLES_SHIFT;
+ tstamp->cycles.mult = clocksource_khz2mult(dev_freq,
+ tstamp->cycles.shift);
+ tstamp->nominal_c_mult = tstamp->cycles.mult;
+ tstamp->cycles.mask = CLOCKSOURCE_MASK(41);
+
+ timecounter_init(&tstamp->clock, &tstamp->cycles,
+ ktime_to_ns(ktime_get_real()));
+
+ /* Calculate period in seconds to call the overflow watchdog - to make
+ * sure counter is checked at least once every wrap around.
+ */
+ ns = cyclecounter_cyc2ns(&tstamp->cycles, tstamp->cycles.mask, frac,
+ &frac);
+ do_div(ns, NSEC_PER_SEC / 2 / HZ);
+ tstamp->overflow_period = ns;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 2e022e9..8e86f2c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -855,6 +855,34 @@ static int mlx5e_set_pauseparam(struct net_device *netdev,
return err;
}
+static int mlx5e_get_ts_info(struct net_device *dev,
+ struct ethtool_ts_info *info)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+ int ret;
+
+ ret = ethtool_op_get_ts_info(dev, info);
+ if (ret)
+ return ret;
+
+ if (MLX5_CAP_GEN(priv->mdev, device_frequency_khz)) {
+ info->so_timestamping |=
+ SOF_TIMESTAMPING_TX_HARDWARE |
+ SOF_TIMESTAMPING_RX_HARDWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE;
+
+ info->tx_types =
+ (1 << HWTSTAMP_TX_OFF) |
+ (1 << HWTSTAMP_TX_ON);
+
+ info->rx_filters =
+ (1 << HWTSTAMP_FILTER_NONE) |
+ (1 << HWTSTAMP_FILTER_ALL);
+ }
+
+ return 0;
+}
+
const struct ethtool_ops mlx5e_ethtool_ops = {
.get_drvinfo = mlx5e_get_drvinfo,
.get_link = ethtool_op_get_link,
@@ -878,4 +906,5 @@ const struct ethtool_ops mlx5e_ethtool_ops = {
.set_tunable = mlx5e_set_tunable,
.get_pauseparam = mlx5e_get_pauseparam,
.set_pauseparam = mlx5e_set_pauseparam,
+ .get_ts_info = mlx5e_get_ts_info,
};
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index d4601a5..c8c4fa7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -884,6 +884,30 @@ static void mlx5e_close_cq(struct mlx5e_cq *cq)
mlx5e_destroy_cq(cq);
}
+/* mlx5e_service_task - Run service task for tasks that needed to be done
+ * periodically
+ */
+static void mlx5e_service_task(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct mlx5e_priv *priv = container_of(dwork, struct mlx5e_priv,
+ service_task);
+
+ mutex_lock(&priv->state_lock);
+ if (test_bit(MLX5E_STATE_OPENED, &priv->state) &&
+ !test_bit(MLX5E_STATE_DESTROYING, &priv->state)) {
+ if (MLX5_CAP_GEN(priv->mdev, device_frequency_khz)) {
+ mlx5e_timestamp_overflow_check(priv);
+ /* Only mlx5e_timestamp_overflow_check is called from
+ * this service task. schedule a new task only if clock
+ * is initialized. if changed, move the scheduler.
+ */
+ schedule_delayed_work(dwork, MLX5E_SERVICE_TASK_DELAY);
+ }
+ }
+ mutex_unlock(&priv->state_lock);
+}
+
static int mlx5e_get_cpu(struct mlx5e_priv *priv, int ix)
{
return cpumask_first(priv->mdev->priv.irq_info[ix].mask);
@@ -1429,6 +1453,7 @@ int mlx5e_open_locked(struct net_device *netdev)
mlx5e_redirect_rqts(priv);
schedule_delayed_work(&priv->update_stats_work, 0);
+ schedule_delayed_work(&priv->service_task, 0);
return 0;
@@ -1932,6 +1957,77 @@ static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu)
return err;
}
+static int mlx5e_hwstamp_set(struct net_device *dev, struct ifreq *ifr)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+ struct hwtstamp_config config;
+
+ if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz))
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ /* TX HW timestamp */
+ switch (config.tx_type) {
+ case HWTSTAMP_TX_OFF:
+ case HWTSTAMP_TX_ON:
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ /* RX HW timestamp */
+ switch (config.rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ break;
+ case HWTSTAMP_FILTER_ALL:
+ case HWTSTAMP_FILTER_SOME:
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ config.rx_filter = HWTSTAMP_FILTER_ALL;
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ priv->tstamp.hwtstamp_config.tx_type = config.tx_type;
+ priv->tstamp.hwtstamp_config.rx_filter = config.rx_filter;
+
+ return copy_to_user(ifr->ifr_data, &config,
+ sizeof(config)) ? -EFAULT : 0;
+}
+
+static int mlx5e_hwstamp_get(struct net_device *dev, struct ifreq *ifr)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+
+ return copy_to_user(ifr->ifr_data, &priv->tstamp.hwtstamp_config,
+ sizeof(priv->tstamp.hwtstamp_config)) ? -EFAULT : 0;
+}
+
+static int mlx5e_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ switch (cmd) {
+ case SIOCSHWTSTAMP:
+ return mlx5e_hwstamp_set(dev, ifr);
+ case SIOCGHWTSTAMP:
+ return mlx5e_hwstamp_get(dev, ifr);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
static int mlx5e_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
{
struct mlx5e_priv *priv = netdev_priv(dev);
@@ -2015,7 +2111,8 @@ static struct net_device_ops mlx5e_netdev_ops = {
.ndo_vlan_rx_add_vid = mlx5e_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = mlx5e_vlan_rx_kill_vid,
.ndo_set_features = mlx5e_set_features,
- .ndo_change_mtu = mlx5e_change_mtu
+ .ndo_change_mtu = mlx5e_change_mtu,
+ .ndo_do_ioctl = mlx5e_ioctl,
};
static int mlx5e_check_required_hca_cap(struct mlx5_core_dev *mdev)
@@ -2096,6 +2193,7 @@ static void mlx5e_build_netdev_priv(struct mlx5_core_dev *mdev,
INIT_WORK(&priv->update_carrier_work, mlx5e_update_carrier_work);
INIT_WORK(&priv->set_rx_mode_work, mlx5e_set_rx_mode_work);
INIT_DELAYED_WORK(&priv->update_stats_work, mlx5e_update_stats_work);
+ INIT_DELAYED_WORK(&priv->service_task, mlx5e_service_task);
}
static void mlx5e_set_netdev_dev_addr(struct net_device *netdev)
@@ -2270,6 +2368,7 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
}
mlx5e_init_eth_addr(priv);
+ mlx5e_timestamp_init(priv);
err = register_netdev(netdev);
if (err) {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 7c8c408..4ae70cd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -36,6 +36,10 @@
#include <net/busy_poll.h>
#include "en.h"
+#define MLX5E_RX_HW_STAMP(priv) \
+ (priv->tstamp.hwtstamp_config.rx_filter == \
+ HWTSTAMP_FILTER_ALL)
+
static inline int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq,
struct mlx5e_rx_wqe *wqe, u16 ix)
{
@@ -189,6 +193,7 @@ static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
struct sk_buff *skb)
{
struct net_device *netdev = rq->netdev;
+ struct mlx5e_priv *priv = netdev_priv(netdev);
u32 cqe_bcnt = be32_to_cpu(cqe->byte_cnt);
int lro_num_seg;
@@ -202,6 +207,10 @@ static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
rq->stats.lro_bytes += cqe_bcnt;
}
+ if (MLX5E_RX_HW_STAMP(priv))
+ mlx5e_fill_hwstamp(&priv->tstamp, skb_hwtstamps(skb),
+ get_cqe_ts(cqe));
+
mlx5e_handle_csum(netdev, cqe, rq, skb);
skb->protocol = eth_type_trans(skb, netdev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index 0fcfe64..6d53386 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -37,6 +37,9 @@
#define MLX5E_SQ_NOPS_ROOM MLX5_SEND_WQE_MAX_WQEBBS
#define MLX5E_SQ_STOP_ROOM (MLX5_SEND_WQE_MAX_WQEBBS +\
MLX5E_SQ_NOPS_ROOM)
+#define MLX5E_TX_HW_STAMP(priv, skb) \
+ (priv->tstamp.hwtstamp_config.tx_type == HWTSTAMP_TX_ON && \
+ skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
void mlx5e_send_nop(struct mlx5e_sq *sq, bool notify_hw)
{
@@ -271,6 +274,9 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *sq, struct sk_buff *skb)
MLX5_SEND_WQEBB_NUM_DS);
sq->pc += MLX5E_TX_SKB_CB(skb)->num_wqebbs;
+ if (MLX5E_TX_HW_STAMP(sq->channel->priv, skb))
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
netdev_tx_sent_queue(sq->txq, MLX5E_TX_SKB_CB(skb)->num_bytes);
if (unlikely(!mlx5e_sq_has_room_for(sq, MLX5E_SQ_STOP_ROOM))) {
@@ -369,6 +375,14 @@ bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq)
continue;
}
+ if (MLX5E_TX_HW_STAMP(sq->channel->priv, skb)) {
+ struct skb_shared_hwtstamps hwts;
+
+ mlx5e_fill_hwstamp(&sq->cq.channel->priv->tstamp,
+ &hwts, get_cqe_ts(cqe));
+ skb_tstamp_tx(skb, &hwts);
+ }
+
for (j = 0; j < MLX5E_TX_SKB_CB(skb)->num_dma; j++) {
struct mlx5e_sq_dma *dma =
mlx5e_dma_get(sq, dma_fifo_cc++);
--
1.7.1
--
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