* [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock
2018-12-19 13:49 [dpdk-dev] [PATCH 0/3] Add rte_eth_read_clock API Tom Barbette
@ 2018-12-19 13:49 ` Tom Barbette
2018-12-20 6:42 ` Shahaf Shuler
2018-12-20 19:55 ` Ferruh Yigit
2018-12-19 13:49 ` [dpdk-dev] [PATCH 2/3] mlx5: Implement support for read_clock Tom Barbette
2018-12-19 13:49 ` [dpdk-dev] [PATCH 3/3] rxtx_callbacks: Add support for HW timestamp Tom Barbette
2 siblings, 2 replies; 7+ messages in thread
From: Tom Barbette @ 2018-12-19 13:49 UTC (permalink / raw)
To: dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon, Ferruh Yigit,
Andrew Rybchenko, Shahaf Shuler, Yongseok Koh, Tom Barbette
Add rte_eth_read_clock to read the raw clock of a devide.
The main use is to get the device clock conversion co-efficients to be
able to translate the raw clock of the timestamp field of the pkt mbuf
to a local synced time value.
This function was missing to allow users to convert the RX timestamp field
to real time without the complexity of the rte_timesync* facility. One can
derivate the clock frequency by calling twice read_clock and then keep a
common time base.
Signed-off-by: Tom Barbette <barbette@kth.se>
---
doc/guides/nics/features.rst | 1 +
lib/librte_ethdev/rte_ethdev.c | 13 +++++++
lib/librte_ethdev/rte_ethdev.h | 44 ++++++++++++++++++++++++
lib/librte_ethdev/rte_ethdev_core.h | 6 ++++
lib/librte_ethdev/rte_ethdev_version.map | 1 +
lib/librte_mbuf/rte_mbuf.h | 2 ++
6 files changed, 67 insertions(+)
diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index d3f904839..45484a30f 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -602,6 +602,7 @@ Supports Timestamp.
* **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_TIMESTAMP``.
* **[provides] mbuf**: ``mbuf.timestamp``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa: DEV_RX_OFFLOAD_TIMESTAMP``.
+* **[implements] eth_dev_ops**: ``read_clock``.
.. _nic_features_macsec_offload:
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 9d5107dce..97f92d11a 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -4124,6 +4124,19 @@ rte_eth_timesync_write_time(uint16_t port_id, const struct timespec *timestamp)
timestamp));
}
+int
+rte_eth_read_clock(uint16_t port_id, uint64_t *timestamp)
+{
+ struct rte_eth_dev *dev;
+
+ RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+ dev = &rte_eth_devices[port_id];
+
+ RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->read_clock, -ENOTSUP);
+ return eth_err(port_id, (*dev->dev_ops->read_clock)(dev,
+ timestamp));
+}
+
int
rte_eth_dev_get_reg_info(uint16_t port_id, struct rte_dev_reg_info *info)
{
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 1960f3a2d..5a831db29 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -3642,6 +3642,50 @@ int rte_eth_timesync_read_time(uint16_t port_id, struct timespec *time);
*/
int rte_eth_timesync_write_time(uint16_t port_id, const struct timespec *time);
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Read the current clock counter of an Ethernet device
+ *
+ * This returns the current raw clock value of an Ethernet device.
+ * The value returned here is from the same clock than the one
+ * filling timestamp field of RX packets. Therefore it can be used
+ * to compute a precise conversion of the device clock to the real time.
+ *
+ * E.g, a simple heuristic to derivate the frequency would be:
+ * uint64_t start, end;
+ * rte_eth_read_clock(port, start);
+ * rte_delay_ms(100);
+ * rte_eth_read_clock(port, end);
+ * double freq = (end - start) * 10;
+ *
+ * Compute a common reference with:
+ * uint64_t base_time_sec = current_time();
+ * uint64_t base_clock;
+ * rte_eth_read_clock(port, base_clock);
+ *
+ * Then, convert the raw mbuf timestamp with:
+ * base_time_sec + (double)(mbuf->timestamp - base_clock) / freq;
+ *
+ * This simple example will not provide a very good accuracy. One must
+ * at least measure multiple times the frequency and do a regression.
+ * To avoid deviation from the system time, the common reference can
+ * be repeated from time to time. The integer division can also be
+ * converted by a multiplication and a shift for better performance.
+ *
+ * @param port_id
+ * The port identifier of the Ethernet device.
+ * @param time
+ * Pointer to the uint64_t that holds the raw clock value.
+ *
+ * @return
+ * - 0: Success.
+ * - -ENODEV: The port ID is invalid.
+ * - -ENOTSUP: The function is not supported by the Ethernet driver.
+ */
+int __rte_experimental rte_eth_read_clock(uint16_t port_id, uint64_t *time);
+
/**
* Config l2 tunnel ether type of an Ethernet device for filtering specific
* tunnel packets by ether type.
diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
index 8f03f83f6..86806b3eb 100644
--- a/lib/librte_ethdev/rte_ethdev_core.h
+++ b/lib/librte_ethdev/rte_ethdev_core.h
@@ -322,6 +322,10 @@ typedef int (*eth_timesync_write_time)(struct rte_eth_dev *dev,
const struct timespec *timestamp);
/**< @internal Function used to get time from the device clock */
+typedef int (*eth_read_clock)(struct rte_eth_dev *dev,
+ uint64_t *timestamp);
+/**< @internal Function used to get the current value of the device clock. */
+
typedef int (*eth_get_reg_t)(struct rte_eth_dev *dev,
struct rte_dev_reg_info *info);
/**< @internal Retrieve registers */
@@ -496,6 +500,8 @@ struct eth_dev_ops {
eth_timesync_read_time timesync_read_time; /** Get the device clock time. */
eth_timesync_write_time timesync_write_time; /** Set the device clock time. */
+ eth_read_clock read_clock;
+
eth_xstats_get_by_id_t xstats_get_by_id;
/**< Get extended device statistic values by ID. */
eth_xstats_get_names_by_id_t xstats_get_names_by_id;
diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
index 92ac3de25..12d6c3c1d 100644
--- a/lib/librte_ethdev/rte_ethdev_version.map
+++ b/lib/librte_ethdev/rte_ethdev_version.map
@@ -249,6 +249,7 @@ EXPERIMENTAL {
rte_eth_switch_domain_free;
rte_flow_conv;
rte_flow_expand_rss;
+ rte_eth_read_clock;
rte_mtr_capabilities_get;
rte_mtr_create;
rte_mtr_destroy;
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 3dbc6695e..4ceefa913 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -605,6 +605,8 @@ struct rte_mbuf {
/** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
* are not normalized but are always the same for a given port.
+ * Some devices allow to query rte_eth_read_clock that will return the
+ * current device timestamp.
*/
uint64_t timestamp;
--
2.17.1
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock
2018-12-19 13:49 ` [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock Tom Barbette
@ 2018-12-20 6:42 ` Shahaf Shuler
2018-12-20 19:55 ` Ferruh Yigit
1 sibling, 0 replies; 7+ messages in thread
From: Shahaf Shuler @ 2018-12-20 6:42 UTC (permalink / raw)
To: Tom Barbette, dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon, Ferruh Yigit,
Andrew Rybchenko, Yongseok Koh
Wednesday, December 19, 2018 3:50 PM, Tom Barbette:
> Subject: [PATCH 1/3] rte_ethdev: Add API function to read dev clock
>
> Add rte_eth_read_clock to read the raw clock of a devide.
>
> The main use is to get the device clock conversion co-efficients to be able to
> translate the raw clock of the timestamp field of the pkt mbuf to a local synced
> time value.
>
> This function was missing to allow users to convert the RX timestamp field to
> real time without the complexity of the rte_timesync* facility. One can
> derivate the clock frequency by calling twice read_clock and then keep a
> common time base.
>
> Signed-off-by: Tom Barbette <barbette@kth.se>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
> ---
> doc/guides/nics/features.rst | 1 +
> lib/librte_ethdev/rte_ethdev.c | 13 +++++++
> lib/librte_ethdev/rte_ethdev.h | 44 ++++++++++++++++++++++++
> lib/librte_ethdev/rte_ethdev_core.h | 6 ++++
> lib/librte_ethdev/rte_ethdev_version.map | 1 +
> lib/librte_mbuf/rte_mbuf.h | 2 ++
> 6 files changed, 67 insertions(+)
>
> diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst index
> d3f904839..45484a30f 100644
> --- a/doc/guides/nics/features.rst
> +++ b/doc/guides/nics/features.rst
> @@ -602,6 +602,7 @@ Supports Timestamp.
> * **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_TIMESTAMP``.
> * **[provides] mbuf**: ``mbuf.timestamp``.
> * **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:
> DEV_RX_OFFLOAD_TIMESTAMP``.
> +* **[implements] eth_dev_ops**: ``read_clock``.
>
> .. _nic_features_macsec_offload:
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 9d5107dce..97f92d11a 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -4124,6 +4124,19 @@ rte_eth_timesync_write_time(uint16_t port_id,
> const struct timespec *timestamp)
> timestamp));
> }
>
> +int
> +rte_eth_read_clock(uint16_t port_id, uint64_t *timestamp) {
> + struct rte_eth_dev *dev;
> +
> + RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
> + dev = &rte_eth_devices[port_id];
> +
> + RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->read_clock, -
> ENOTSUP);
> + return eth_err(port_id, (*dev->dev_ops->read_clock)(dev,
> + timestamp));
> +}
> +
> int
> rte_eth_dev_get_reg_info(uint16_t port_id, struct rte_dev_reg_info *info) {
> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> index 1960f3a2d..5a831db29 100644
> --- a/lib/librte_ethdev/rte_ethdev.h
> +++ b/lib/librte_ethdev/rte_ethdev.h
> @@ -3642,6 +3642,50 @@ int rte_eth_timesync_read_time(uint16_t port_id,
> struct timespec *time);
> */
> int rte_eth_timesync_write_time(uint16_t port_id, const struct timespec
> *time);
>
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Read the current clock counter of an Ethernet device
> + *
> + * This returns the current raw clock value of an Ethernet device.
> + * The value returned here is from the same clock than the one
> + * filling timestamp field of RX packets. Therefore it can be used
> + * to compute a precise conversion of the device clock to the real time.
> + *
> + * E.g, a simple heuristic to derivate the frequency would be:
> + * uint64_t start, end;
> + * rte_eth_read_clock(port, start);
> + * rte_delay_ms(100);
> + * rte_eth_read_clock(port, end);
> + * double freq = (end - start) * 10;
> + *
> + * Compute a common reference with:
> + * uint64_t base_time_sec = current_time();
> + * uint64_t base_clock;
> + * rte_eth_read_clock(port, base_clock);
> + *
> + * Then, convert the raw mbuf timestamp with:
> + * base_time_sec + (double)(mbuf->timestamp - base_clock) / freq;
> + *
> + * This simple example will not provide a very good accuracy. One must
> + * at least measure multiple times the frequency and do a regression.
> + * To avoid deviation from the system time, the common reference can
> + * be repeated from time to time. The integer division can also be
> + * converted by a multiplication and a shift for better performance.
> + *
> + * @param port_id
> + * The port identifier of the Ethernet device.
> + * @param time
> + * Pointer to the uint64_t that holds the raw clock value.
> + *
> + * @return
> + * - 0: Success.
> + * - -ENODEV: The port ID is invalid.
> + * - -ENOTSUP: The function is not supported by the Ethernet driver.
> + */
> +int __rte_experimental rte_eth_read_clock(uint16_t port_id, uint64_t
> +*time);
> +
> /**
> * Config l2 tunnel ether type of an Ethernet device for filtering specific
> * tunnel packets by ether type.
> diff --git a/lib/librte_ethdev/rte_ethdev_core.h
> b/lib/librte_ethdev/rte_ethdev_core.h
> index 8f03f83f6..86806b3eb 100644
> --- a/lib/librte_ethdev/rte_ethdev_core.h
> +++ b/lib/librte_ethdev/rte_ethdev_core.h
> @@ -322,6 +322,10 @@ typedef int (*eth_timesync_write_time)(struct
> rte_eth_dev *dev,
> const struct timespec *timestamp); /**<
> @internal Function used to get time from the device clock */
>
> +typedef int (*eth_read_clock)(struct rte_eth_dev *dev,
> + uint64_t *timestamp);
> +/**< @internal Function used to get the current value of the device
> +clock. */
> +
> typedef int (*eth_get_reg_t)(struct rte_eth_dev *dev,
> struct rte_dev_reg_info *info);
> /**< @internal Retrieve registers */
> @@ -496,6 +500,8 @@ struct eth_dev_ops {
> eth_timesync_read_time timesync_read_time; /** Get the device
> clock time. */
> eth_timesync_write_time timesync_write_time; /** Set the device
> clock time. */
>
> + eth_read_clock read_clock;
> +
> eth_xstats_get_by_id_t xstats_get_by_id;
> /**< Get extended device statistic values by ID. */
> eth_xstats_get_names_by_id_t xstats_get_names_by_id; diff --git
> a/lib/librte_ethdev/rte_ethdev_version.map
> b/lib/librte_ethdev/rte_ethdev_version.map
> index 92ac3de25..12d6c3c1d 100644
> --- a/lib/librte_ethdev/rte_ethdev_version.map
> +++ b/lib/librte_ethdev/rte_ethdev_version.map
> @@ -249,6 +249,7 @@ EXPERIMENTAL {
> rte_eth_switch_domain_free;
> rte_flow_conv;
> rte_flow_expand_rss;
> + rte_eth_read_clock;
> rte_mtr_capabilities_get;
> rte_mtr_create;
> rte_mtr_destroy;
> diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h index
> 3dbc6695e..4ceefa913 100644
> --- a/lib/librte_mbuf/rte_mbuf.h
> +++ b/lib/librte_mbuf/rte_mbuf.h
> @@ -605,6 +605,8 @@ struct rte_mbuf {
>
> /** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
> * are not normalized but are always the same for a given port.
> + * Some devices allow to query rte_eth_read_clock that will return the
> + * current device timestamp.
> */
> uint64_t timestamp;
>
> --
> 2.17.1
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock
2018-12-19 13:49 ` [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock Tom Barbette
2018-12-20 6:42 ` Shahaf Shuler
@ 2018-12-20 19:55 ` Ferruh Yigit
1 sibling, 0 replies; 7+ messages in thread
From: Ferruh Yigit @ 2018-12-20 19:55 UTC (permalink / raw)
To: Tom Barbette, dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon,
Andrew Rybchenko, Shahaf Shuler, Yongseok Koh
On 12/19/2018 1:49 PM, Tom Barbette wrote:
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Read the current clock counter of an Ethernet device
> + *
> + * This returns the current raw clock value of an Ethernet device.
> + * The value returned here is from the same clock than the one
> + * filling timestamp field of RX packets. Therefore it can be used
> + * to compute a precise conversion of the device clock to the real time.
> + *
> + * E.g, a simple heuristic to derivate the frequency would be:
> + * uint64_t start, end;
> + * rte_eth_read_clock(port, start);
> + * rte_delay_ms(100);
> + * rte_eth_read_clock(port, end);
> + * double freq = (end - start) * 10;
> + *
> + * Compute a common reference with:
> + * uint64_t base_time_sec = current_time();
> + * uint64_t base_clock;
> + * rte_eth_read_clock(port, base_clock);
> + *
> + * Then, convert the raw mbuf timestamp with:
> + * base_time_sec + (double)(mbuf->timestamp - base_clock) / freq;
> + *
> + * This simple example will not provide a very good accuracy. One must
> + * at least measure multiple times the frequency and do a regression.
> + * To avoid deviation from the system time, the common reference can
> + * be repeated from time to time. The integer division can also be
> + * converted by a multiplication and a shift for better performance.
> + *
> + * @param port_id
> + * The port identifier of the Ethernet device.
> + * @param time
> + * Pointer to the uint64_t that holds the raw clock value.
> + *
> + * @return
> + * - 0: Success.
> + * - -ENODEV: The port ID is invalid.
> + * - -ENOTSUP: The function is not supported by the Ethernet driver.
> + */
> +int __rte_experimental rte_eth_read_clock(uint16_t port_id, uint64_t *time);
Is this a common enough feature to include into ethdev abstraction layer? Or a
feature for a single vendor?
I would like to get more input from other vendors if this is something they can
benefit from?
^ permalink raw reply [flat|nested] 7+ messages in thread
* [dpdk-dev] [PATCH 2/3] mlx5: Implement support for read_clock
2018-12-19 13:49 [dpdk-dev] [PATCH 0/3] Add rte_eth_read_clock API Tom Barbette
2018-12-19 13:49 ` [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock Tom Barbette
@ 2018-12-19 13:49 ` Tom Barbette
2018-12-20 6:46 ` Shahaf Shuler
2018-12-19 13:49 ` [dpdk-dev] [PATCH 3/3] rxtx_callbacks: Add support for HW timestamp Tom Barbette
2 siblings, 1 reply; 7+ messages in thread
From: Tom Barbette @ 2018-12-19 13:49 UTC (permalink / raw)
To: dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon, Ferruh Yigit,
Andrew Rybchenko, Shahaf Shuler, Yongseok Koh, Tom Barbette
Signed-off-by: Tom Barbette <barbette@kth.se>
---
drivers/net/mlx5/Makefile | 2 +-
drivers/net/mlx5/meson.build | 2 +-
drivers/net/mlx5/mlx5.c | 1 +
drivers/net/mlx5/mlx5.h | 1 +
drivers/net/mlx5/mlx5_ethdev.c | 30 ++++++++++++++++++++++++++++++
drivers/net/mlx5/mlx5_glue.c | 8 ++++++++
drivers/net/mlx5/mlx5_glue.h | 2 ++
7 files changed, 44 insertions(+), 2 deletions(-)
diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile
index 895cdfeed..1353c1827 100644
--- a/drivers/net/mlx5/Makefile
+++ b/drivers/net/mlx5/Makefile
@@ -8,7 +8,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
LIB = librte_pmd_mlx5.a
LIB_GLUE = $(LIB_GLUE_BASE).$(LIB_GLUE_VERSION)
LIB_GLUE_BASE = librte_pmd_mlx5_glue.so
-LIB_GLUE_VERSION = 18.11.0
+LIB_GLUE_VERSION = 19.02.0
# Sources.
SRCS-$(CONFIG_RTE_LIBRTE_MLX5_PMD) += mlx5.c
diff --git a/drivers/net/mlx5/meson.build b/drivers/net/mlx5/meson.build
index 28938db0f..8ba19e818 100644
--- a/drivers/net/mlx5/meson.build
+++ b/drivers/net/mlx5/meson.build
@@ -4,7 +4,7 @@
pmd_dlopen = get_option('enable_driver_mlx_glue')
LIB_GLUE_BASE = 'librte_pmd_mlx5_glue.so'
-LIB_GLUE_VERSION = '18.11.0'
+LIB_GLUE_VERSION = '19.02.0'
LIB_GLUE = LIB_GLUE_BASE + '.' + LIB_GLUE_VERSION
if pmd_dlopen
dpdk_conf.set('RTE_LIBRTE_MLX5_DLOPEN_DEPS', 1)
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 9e5cab169..ed799ab5a 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -372,6 +372,7 @@ const struct eth_dev_ops mlx5_dev_ops = {
.xstats_reset = mlx5_xstats_reset,
.xstats_get_names = mlx5_xstats_get_names,
.dev_infos_get = mlx5_dev_infos_get,
+ .read_clock = mlx5_read_clock,
.dev_supported_ptypes_get = mlx5_dev_supported_ptypes_get,
.vlan_filter_set = mlx5_vlan_filter_set,
.rx_queue_setup = mlx5_rx_queue_setup,
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 75aeeb2b6..82f98334f 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -264,6 +264,7 @@ int mlx5_set_flags(struct rte_eth_dev *dev, unsigned int keep,
unsigned int flags);
int mlx5_dev_configure(struct rte_eth_dev *dev);
void mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info);
+int mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *time);
const uint32_t *mlx5_dev_supported_ptypes_get(struct rte_eth_dev *dev);
int mlx5_link_update(struct rte_eth_dev *dev, int wait_to_complete);
int mlx5_force_link_status_change(struct rte_eth_dev *dev, int status);
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index d178ed6a1..35bfbf769 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -557,6 +557,36 @@ mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
}
}
+/**
+ * Get device current raw clock counter
+ *
+ * @param dev
+ * Pointer to Ethernet device structure.
+ * @param[out] time
+ * Current raw clock counter of the device.
+ *
+ * @return
+ * 0 if the clock has correctly been read
+ * The value of errno in case of error
+ */
+int
+mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *clock)
+{
+ struct priv *priv = dev->data->dev_private;
+ struct ibv_values_ex values;
+ int err = 0;
+
+ values.comp_mask = IBV_VALUES_MASK_RAW_CLOCK;
+ err = mlx5_glue->query_rt_values_ex(priv->ctx, &values);
+ if (err != 0) {
+ DRV_LOG(WARNING, "Could not query the clock !");
+ return err;
+ }
+ *clock = values.raw_clock.tv_nsec;
+ return 0;
+}
+
+
/**
* Get supported packet types.
*
diff --git a/drivers/net/mlx5/mlx5_glue.c b/drivers/net/mlx5/mlx5_glue.c
index dd10ad6de..e23296519 100644
--- a/drivers/net/mlx5/mlx5_glue.c
+++ b/drivers/net/mlx5/mlx5_glue.c
@@ -86,6 +86,13 @@ mlx5_glue_query_device_ex(struct ibv_context *context,
return ibv_query_device_ex(context, input, attr);
}
+static int
+mlx5_glue_query_rt_values_ex(struct ibv_context *context,
+ struct ibv_values_ex *values)
+{
+ return ibv_query_rt_values_ex(context, values);
+}
+
static int
mlx5_glue_query_port(struct ibv_context *context, uint8_t port_num,
struct ibv_port_attr *port_attr)
@@ -491,6 +498,7 @@ const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue){
.close_device = mlx5_glue_close_device,
.query_device = mlx5_glue_query_device,
.query_device_ex = mlx5_glue_query_device_ex,
+ .query_rt_values_ex = mlx5_glue_query_rt_values_ex,
.query_port = mlx5_glue_query_port,
.create_comp_channel = mlx5_glue_create_comp_channel,
.destroy_comp_channel = mlx5_glue_destroy_comp_channel,
diff --git a/drivers/net/mlx5/mlx5_glue.h b/drivers/net/mlx5/mlx5_glue.h
index 2d92ba8bc..31ebee72a 100644
--- a/drivers/net/mlx5/mlx5_glue.h
+++ b/drivers/net/mlx5/mlx5_glue.h
@@ -70,6 +70,8 @@ struct mlx5_glue {
int (*query_device_ex)(struct ibv_context *context,
const struct ibv_query_device_ex_input *input,
struct ibv_device_attr_ex *attr);
+ int (*query_rt_values_ex)(struct ibv_context *context,
+ struct ibv_values_ex *values);
int (*query_port)(struct ibv_context *context, uint8_t port_num,
struct ibv_port_attr *port_attr);
struct ibv_comp_channel *(*create_comp_channel)
--
2.17.1
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [dpdk-dev] [PATCH 2/3] mlx5: Implement support for read_clock
2018-12-19 13:49 ` [dpdk-dev] [PATCH 2/3] mlx5: Implement support for read_clock Tom Barbette
@ 2018-12-20 6:46 ` Shahaf Shuler
0 siblings, 0 replies; 7+ messages in thread
From: Shahaf Shuler @ 2018-12-20 6:46 UTC (permalink / raw)
To: Tom Barbette, dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon, Ferruh Yigit,
Andrew Rybchenko, Yongseok Koh
Wednesday, December 19, 2018 3:50 PM, Tom Barbette:
> Subject: [PATCH 2/3] mlx5: Implement support for read_clock
Implement -> implement (lower case)
>
> Signed-off-by: Tom Barbette <barbette@kth.se>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
> ---
> drivers/net/mlx5/Makefile | 2 +-
> drivers/net/mlx5/meson.build | 2 +-
> drivers/net/mlx5/mlx5.c | 1 +
> drivers/net/mlx5/mlx5.h | 1 +
> drivers/net/mlx5/mlx5_ethdev.c | 30 ++++++++++++++++++++++++++++++
> drivers/net/mlx5/mlx5_glue.c | 8 ++++++++
> drivers/net/mlx5/mlx5_glue.h | 2 ++
> 7 files changed, 44 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile index
> 895cdfeed..1353c1827 100644
> --- a/drivers/net/mlx5/Makefile
> +++ b/drivers/net/mlx5/Makefile
> @@ -8,7 +8,7 @@ include $(RTE_SDK)/mk/rte.vars.mk LIB =
> librte_pmd_mlx5.a LIB_GLUE = $(LIB_GLUE_BASE).$(LIB_GLUE_VERSION)
> LIB_GLUE_BASE = librte_pmd_mlx5_glue.so -LIB_GLUE_VERSION = 18.11.0
> +LIB_GLUE_VERSION = 19.02.0
>
> # Sources.
> SRCS-$(CONFIG_RTE_LIBRTE_MLX5_PMD) += mlx5.c diff --git
> a/drivers/net/mlx5/meson.build b/drivers/net/mlx5/meson.build index
> 28938db0f..8ba19e818 100644
> --- a/drivers/net/mlx5/meson.build
> +++ b/drivers/net/mlx5/meson.build
> @@ -4,7 +4,7 @@
>
> pmd_dlopen = get_option('enable_driver_mlx_glue')
> LIB_GLUE_BASE = 'librte_pmd_mlx5_glue.so'
> -LIB_GLUE_VERSION = '18.11.0'
> +LIB_GLUE_VERSION = '19.02.0'
> LIB_GLUE = LIB_GLUE_BASE + '.' + LIB_GLUE_VERSION if pmd_dlopen
> dpdk_conf.set('RTE_LIBRTE_MLX5_DLOPEN_DEPS', 1) diff --git
> a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c index
> 9e5cab169..ed799ab5a 100644
> --- a/drivers/net/mlx5/mlx5.c
> +++ b/drivers/net/mlx5/mlx5.c
> @@ -372,6 +372,7 @@ const struct eth_dev_ops mlx5_dev_ops = {
> .xstats_reset = mlx5_xstats_reset,
> .xstats_get_names = mlx5_xstats_get_names,
> .dev_infos_get = mlx5_dev_infos_get,
> + .read_clock = mlx5_read_clock,
> .dev_supported_ptypes_get = mlx5_dev_supported_ptypes_get,
> .vlan_filter_set = mlx5_vlan_filter_set,
> .rx_queue_setup = mlx5_rx_queue_setup, diff --git
> a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h index
> 75aeeb2b6..82f98334f 100644
> --- a/drivers/net/mlx5/mlx5.h
> +++ b/drivers/net/mlx5/mlx5.h
> @@ -264,6 +264,7 @@ int mlx5_set_flags(struct rte_eth_dev *dev, unsigned
> int keep,
> unsigned int flags);
> int mlx5_dev_configure(struct rte_eth_dev *dev); void
> mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info);
> +int mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *time);
> const uint32_t *mlx5_dev_supported_ptypes_get(struct rte_eth_dev *dev); int
> mlx5_link_update(struct rte_eth_dev *dev, int wait_to_complete); int
> mlx5_force_link_status_change(struct rte_eth_dev *dev, int status); diff --git
> a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c index
> d178ed6a1..35bfbf769 100644
> --- a/drivers/net/mlx5/mlx5_ethdev.c
> +++ b/drivers/net/mlx5/mlx5_ethdev.c
> @@ -557,6 +557,36 @@ mlx5_dev_infos_get(struct rte_eth_dev *dev, struct
> rte_eth_dev_info *info)
> }
> }
>
> +/**
> + * Get device current raw clock counter
> + *
> + * @param dev
> + * Pointer to Ethernet device structure.
> + * @param[out] time
> + * Current raw clock counter of the device.
> + *
> + * @return
> + * 0 if the clock has correctly been read
> + * The value of errno in case of error
> + */
> +int
> +mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *clock) {
> + struct priv *priv = dev->data->dev_private;
> + struct ibv_values_ex values;
> + int err = 0;
> +
> + values.comp_mask = IBV_VALUES_MASK_RAW_CLOCK;
> + err = mlx5_glue->query_rt_values_ex(priv->ctx, &values);
> + if (err != 0) {
> + DRV_LOG(WARNING, "Could not query the clock !");
> + return err;
> + }
> + *clock = values.raw_clock.tv_nsec;
> + return 0;
> +}
> +
> +
> /**
> * Get supported packet types.
> *
> diff --git a/drivers/net/mlx5/mlx5_glue.c b/drivers/net/mlx5/mlx5_glue.c index
> dd10ad6de..e23296519 100644
> --- a/drivers/net/mlx5/mlx5_glue.c
> +++ b/drivers/net/mlx5/mlx5_glue.c
> @@ -86,6 +86,13 @@ mlx5_glue_query_device_ex(struct ibv_context
> *context,
> return ibv_query_device_ex(context, input, attr); }
>
> +static int
> +mlx5_glue_query_rt_values_ex(struct ibv_context *context,
> + struct ibv_values_ex *values)
> +{
> + return ibv_query_rt_values_ex(context, values); }
> +
> static int
> mlx5_glue_query_port(struct ibv_context *context, uint8_t port_num,
> struct ibv_port_attr *port_attr) @@ -491,6 +498,7 @@
> const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue){
> .close_device = mlx5_glue_close_device,
> .query_device = mlx5_glue_query_device,
> .query_device_ex = mlx5_glue_query_device_ex,
> + .query_rt_values_ex = mlx5_glue_query_rt_values_ex,
> .query_port = mlx5_glue_query_port,
> .create_comp_channel = mlx5_glue_create_comp_channel,
> .destroy_comp_channel = mlx5_glue_destroy_comp_channel, diff --git
> a/drivers/net/mlx5/mlx5_glue.h b/drivers/net/mlx5/mlx5_glue.h index
> 2d92ba8bc..31ebee72a 100644
> --- a/drivers/net/mlx5/mlx5_glue.h
> +++ b/drivers/net/mlx5/mlx5_glue.h
> @@ -70,6 +70,8 @@ struct mlx5_glue {
> int (*query_device_ex)(struct ibv_context *context,
> const struct ibv_query_device_ex_input *input,
> struct ibv_device_attr_ex *attr);
> + int (*query_rt_values_ex)(struct ibv_context *context,
> + struct ibv_values_ex *values);
> int (*query_port)(struct ibv_context *context, uint8_t port_num,
> struct ibv_port_attr *port_attr);
> struct ibv_comp_channel *(*create_comp_channel)
> --
> 2.17.1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [dpdk-dev] [PATCH 3/3] rxtx_callbacks: Add support for HW timestamp
2018-12-19 13:49 [dpdk-dev] [PATCH 0/3] Add rte_eth_read_clock API Tom Barbette
2018-12-19 13:49 ` [dpdk-dev] [PATCH 1/3] rte_ethdev: Add API function to read dev clock Tom Barbette
2018-12-19 13:49 ` [dpdk-dev] [PATCH 2/3] mlx5: Implement support for read_clock Tom Barbette
@ 2018-12-19 13:49 ` Tom Barbette
2 siblings, 0 replies; 7+ messages in thread
From: Tom Barbette @ 2018-12-19 13:49 UTC (permalink / raw)
To: dev
Cc: bruce.richardson, john.mcnamara, Thomas Monjalon, Ferruh Yigit,
Andrew Rybchenko, Shahaf Shuler, Yongseok Koh, Tom Barbette
Use rxtx callback to demonstrate a way to use rte_eth_read_clock to
convert the hardware timestamps to an amount of cycles.
This allows to get the amount of time the packet spent since its entry
in the device. While the regular latency only shows the latency from
when it entered the software stack.
Signed-off-by: Tom Barbette <barbette@kth.se>
---
doc/guides/sample_app_ug/rxtx_callbacks.rst | 9 ++-
examples/rxtx_callbacks/Makefile | 2 +
examples/rxtx_callbacks/main.c | 86 ++++++++++++++++++++-
examples/rxtx_callbacks/meson.build | 1 +
4 files changed, 93 insertions(+), 5 deletions(-)
diff --git a/doc/guides/sample_app_ug/rxtx_callbacks.rst b/doc/guides/sample_app_ug/rxtx_callbacks.rst
index 85d96d8a2..895f02296 100644
--- a/doc/guides/sample_app_ug/rxtx_callbacks.rst
+++ b/doc/guides/sample_app_ug/rxtx_callbacks.rst
@@ -13,6 +13,10 @@ In the sample application a user defined callback is applied to all received
packets to add a timestamp. A separate callback is applied to all packets
prior to transmission to calculate the elapsed time, in CPU cycles.
+If hardware timestamping is supported by the NIC, the sample application will
+also display the average latency since the packet was timestamped in hardware,
+on top of the latency since the packet was received and processed by the RX
+callback.
Compiling the Application
-------------------------
@@ -36,7 +40,10 @@ To run the example in a ``linuxapp`` environment:
.. code-block:: console
- ./build/rxtx_callbacks -l 1 -n 4
+ ./build/rxtx_callbacks -l 1 -n 4 -- [-t]
+
+Use -t to enable hardware timestamping. If not supported by the NIC, an error
+will be displayed.
Refer to *DPDK Getting Started Guide* for general information on running
applications and the Environment Abstraction Layer (EAL) options.
diff --git a/examples/rxtx_callbacks/Makefile b/examples/rxtx_callbacks/Makefile
index e9d30d56f..e70c081f2 100644
--- a/examples/rxtx_callbacks/Makefile
+++ b/examples/rxtx_callbacks/Makefile
@@ -50,6 +50,8 @@ include $(RTE_SDK)/mk/rte.vars.mk
CFLAGS += $(WERROR_FLAGS)
+
+CFLAGS += -DALLOW_EXPERIMENTAL_API
# workaround for a gcc bug with noreturn attribute
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
diff --git a/examples/rxtx_callbacks/main.c b/examples/rxtx_callbacks/main.c
index 2058be627..7000464e1 100644
--- a/examples/rxtx_callbacks/main.c
+++ b/examples/rxtx_callbacks/main.c
@@ -10,6 +10,8 @@
#include <rte_lcore.h>
#include <rte_mbuf.h>
+#include <getopt.h>
+
#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024
@@ -17,6 +19,9 @@
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32
+static const char usage[] =
+ "%s EAL_ARGS -- [-t]\n";
+
static const struct rte_eth_conf port_conf_default = {
.rxmode = {
.max_rx_pkt_len = ETHER_MAX_LEN,
@@ -25,9 +30,14 @@ static const struct rte_eth_conf port_conf_default = {
static struct {
uint64_t total_cycles;
+ uint64_t total_queue_cycles;
uint64_t total_pkts;
} latency_numbers;
+int hw_timestamping;
+
+#define TICKS_PER_CYCLE_SHIFT 16
+uint64_t ticks_per_cycle_mult;
static uint16_t
add_timestamps(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
@@ -43,22 +53,42 @@ add_timestamps(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
}
static uint16_t
-calc_latency(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
+calc_latency(uint16_t port, uint16_t qidx __rte_unused,
struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
{
uint64_t cycles = 0;
+ uint64_t queue_ticks = 0;
uint64_t now = rte_rdtsc();
+ uint64_t ticks;
unsigned i;
- for (i = 0; i < nb_pkts; i++)
+ if (hw_timestamping)
+ rte_eth_read_clock(port, &ticks);
+
+ for (i = 0; i < nb_pkts; i++) {
cycles += now - pkts[i]->udata64;
+ if (hw_timestamping)
+ queue_ticks += ticks - pkts[i]->timestamp;
+ }
+
latency_numbers.total_cycles += cycles;
+ if (hw_timestamping)
+ latency_numbers.total_queue_cycles += (queue_ticks
+ * ticks_per_cycle_mult) >> TICKS_PER_CYCLE_SHIFT;
+
latency_numbers.total_pkts += nb_pkts;
if (latency_numbers.total_pkts > (100 * 1000 * 1000ULL)) {
printf("Latency = %"PRIu64" cycles\n",
latency_numbers.total_cycles / latency_numbers.total_pkts);
- latency_numbers.total_cycles = latency_numbers.total_pkts = 0;
+ if (hw_timestamping) {
+ printf("Latency from HW = %"PRIu64" cycles\n",
+ latency_numbers.total_queue_cycles
+ / latency_numbers.total_pkts);
+ }
+ latency_numbers.total_cycles = 0;
+ latency_numbers.total_queue_cycles = 0;
+ latency_numbers.total_pkts = 0;
}
return nb_pkts;
}
@@ -77,6 +107,7 @@ port_init(uint16_t port, struct rte_mempool *mbuf_pool)
int retval;
uint16_t q;
struct rte_eth_dev_info dev_info;
+ struct rte_eth_rxconf rxconf;
struct rte_eth_txconf txconf;
if (!rte_eth_dev_is_valid_port(port))
@@ -95,9 +126,20 @@ port_init(uint16_t port, struct rte_mempool *mbuf_pool)
if (retval != 0)
return retval;
+ rxconf = dev_info.default_rxconf;
+
+ if (hw_timestamping) {
+ if (!(dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TIMESTAMP)) {
+ printf("\nERROR: Port %u does not support hardware timestamping\n"
+ , port);
+ return -1;
+ }
+ rxconf.offloads |= DEV_RX_OFFLOAD_TIMESTAMP;
+ }
+
for (q = 0; q < rx_rings; q++) {
retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
- rte_eth_dev_socket_id(port), NULL, mbuf_pool);
+ rte_eth_dev_socket_id(port), &rxconf, mbuf_pool);
if (retval < 0)
return retval;
}
@@ -115,6 +157,25 @@ port_init(uint16_t port, struct rte_mempool *mbuf_pool)
if (retval < 0)
return retval;
+ if (hw_timestamping && ticks_per_cycle_mult == 0) {
+ uint64_t cycles_base = rte_rdtsc();
+ uint64_t ticks_base;
+ rte_eth_read_clock(port, &ticks_base);
+ rte_delay_ms(100);
+ uint64_t cycles = rte_rdtsc();
+ uint64_t ticks;
+ rte_eth_read_clock(port, &ticks);
+ uint64_t c_freq = cycles - cycles_base;
+ uint64_t t_freq = ticks - ticks_base;
+ double freq_mult = (double)c_freq / t_freq;
+ printf("TSC Freq ~= %lu\nHW Freq ~= %lu\nRatio : %f\n",
+ c_freq * 10, t_freq * 10, freq_mult);
+ /* TSC will be faster than internal ticks so freq_mult is > 0
+ * We convert the multiplication to an integer shift & mult
+ */
+ ticks_per_cycle_mult = (1 << TICKS_PER_CYCLE_SHIFT) / freq_mult;
+ }
+
struct ether_addr addr;
rte_eth_macaddr_get(port, &addr);
@@ -177,6 +238,11 @@ main(int argc, char *argv[])
struct rte_mempool *mbuf_pool;
uint16_t nb_ports;
uint16_t portid;
+ struct option lgopts[] = {
+ { NULL, 0, 0, 0 }
+ };
+ int opt, option_index;
+
/* init EAL */
int ret = rte_eal_init(argc, argv);
@@ -186,6 +252,18 @@ main(int argc, char *argv[])
argc -= ret;
argv += ret;
+ while ((opt = getopt_long(argc, argv, "t", lgopts, &option_index))
+ != EOF)
+ switch (opt) {
+ case 't':
+ hw_timestamping = 1;
+ break;
+ default:
+ printf(usage, argv[0]);
+ return -1;
+ }
+ optind = 1; /* reset getopt lib */
+
nb_ports = rte_eth_dev_count_avail();
if (nb_ports < 2 || (nb_ports & 1))
rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
diff --git a/examples/rxtx_callbacks/meson.build b/examples/rxtx_callbacks/meson.build
index c34e11e36..2b0a25036 100644
--- a/examples/rxtx_callbacks/meson.build
+++ b/examples/rxtx_callbacks/meson.build
@@ -6,6 +6,7 @@
# To build this example as a standalone application with an already-installed
# DPDK instance, use 'make'
+allow_experimental_apis = true
sources = files(
'main.c'
)
--
2.17.1
^ permalink raw reply [flat|nested] 7+ messages in thread