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-rw-r--r--Documentation/networking/device_drivers/ethernet/mellanox/mlx5.rst46
-rw-r--r--Documentation/networking/devlink/devlink-port.rst122
-rw-r--r--Documentation/networking/ethtool-netlink.rst31
-rw-r--r--Documentation/networking/timestamping.rst32
4 files changed, 196 insertions, 35 deletions
diff --git a/Documentation/networking/device_drivers/ethernet/mellanox/mlx5.rst b/Documentation/networking/device_drivers/ethernet/mellanox/mlx5.rst
index e8fa7ac9e6b1..6969652f593c 100644
--- a/Documentation/networking/device_drivers/ethernet/mellanox/mlx5.rst
+++ b/Documentation/networking/device_drivers/ethernet/mellanox/mlx5.rst
@@ -351,42 +351,26 @@ driver.
MAC address setup
-----------------
-mlx5 driver provides mechanism to setup the MAC address of the PCI VF/SF.
+mlx5 driver support devlink port function attr mechanism to setup MAC
+address. (refer to Documentation/networking/devlink/devlink-port.rst)
-The configured MAC address of the PCI VF/SF will be used by netdevice and rdma
-device created for the PCI VF/SF.
+RoCE capability setup
+---------------------
+Not all mlx5 PCI devices/SFs require RoCE capability.
-- Get the MAC address of the VF identified by its unique devlink port index::
+When RoCE capability is disabled, it saves 1 Mbytes worth of system memory per
+PCI devices/SF.
- $ devlink port show pci/0000:06:00.0/2
- pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
- function:
- hw_addr 00:00:00:00:00:00
-
-- Set the MAC address of the VF identified by its unique devlink port index::
-
- $ devlink port function set pci/0000:06:00.0/2 hw_addr 00:11:22:33:44:55
-
- $ devlink port show pci/0000:06:00.0/2
- pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
- function:
- hw_addr 00:11:22:33:44:55
-
-- Get the MAC address of the SF identified by its unique devlink port index::
-
- $ devlink port show pci/0000:06:00.0/32768
- pci/0000:06:00.0/32768: type eth netdev enp6s0pf0sf88 flavour pcisf pfnum 0 sfnum 88
- function:
- hw_addr 00:00:00:00:00:00
-
-- Set the MAC address of the SF identified by its unique devlink port index::
+mlx5 driver support devlink port function attr mechanism to setup RoCE
+capability. (refer to Documentation/networking/devlink/devlink-port.rst)
- $ devlink port function set pci/0000:06:00.0/32768 hw_addr 00:00:00:00:88:88
+migratable capability setup
+---------------------------
+User who wants mlx5 PCI VFs to be able to perform live migration need to
+explicitly enable the VF migratable capability.
- $ devlink port show pci/0000:06:00.0/32768
- pci/0000:06:00.0/32768: type eth netdev enp6s0pf0sf88 flavour pcisf pfnum 0 sfnum 88
- function:
- hw_addr 00:00:00:00:88:88
+mlx5 driver support devlink port function attr mechanism to setup migratable
+capability. (refer to Documentation/networking/devlink/devlink-port.rst)
SF state setup
--------------
diff --git a/Documentation/networking/devlink/devlink-port.rst b/Documentation/networking/devlink/devlink-port.rst
index 98557c2ab1c1..3da590953ce8 100644
--- a/Documentation/networking/devlink/devlink-port.rst
+++ b/Documentation/networking/devlink/devlink-port.rst
@@ -110,7 +110,7 @@ devlink ports for both the controllers.
Function configuration
======================
-A user can configure the function attribute before enumerating the PCI
+Users can configure one or more function attributes before enumerating the PCI
function. Usually it means, user should configure function attribute
before a bus specific device for the function is created. However, when
SRIOV is enabled, virtual function devices are created on the PCI bus.
@@ -119,9 +119,127 @@ function device to the driver. For subfunctions, this means user should
configure port function attribute before activating the port function.
A user may set the hardware address of the function using
-'devlink port function set hw_addr' command. For Ethernet port function
+`devlink port function set hw_addr` command. For Ethernet port function
this means a MAC address.
+Users may also set the RoCE capability of the function using
+`devlink port function set roce` command.
+
+Users may also set the function as migratable using
+'devlink port function set migratable' command.
+
+Function attributes
+===================
+
+MAC address setup
+-----------------
+The configured MAC address of the PCI VF/SF will be used by netdevice and rdma
+device created for the PCI VF/SF.
+
+- Get the MAC address of the VF identified by its unique devlink port index::
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00
+
+- Set the MAC address of the VF identified by its unique devlink port index::
+
+ $ devlink port function set pci/0000:06:00.0/2 hw_addr 00:11:22:33:44:55
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:11:22:33:44:55
+
+- Get the MAC address of the SF identified by its unique devlink port index::
+
+ $ devlink port show pci/0000:06:00.0/32768
+ pci/0000:06:00.0/32768: type eth netdev enp6s0pf0sf88 flavour pcisf pfnum 0 sfnum 88
+ function:
+ hw_addr 00:00:00:00:00:00
+
+- Set the MAC address of the SF identified by its unique devlink port index::
+
+ $ devlink port function set pci/0000:06:00.0/32768 hw_addr 00:00:00:00:88:88
+
+ $ devlink port show pci/0000:06:00.0/32768
+ pci/0000:06:00.0/32768: type eth netdev enp6s0pf0sf88 flavour pcisf pfnum 0 sfnum 88
+ function:
+ hw_addr 00:00:00:00:88:88
+
+RoCE capability setup
+---------------------
+Not all PCI VFs/SFs require RoCE capability.
+
+When RoCE capability is disabled, it saves system memory per PCI VF/SF.
+
+When user disables RoCE capability for a VF/SF, user application cannot send or
+receive any RoCE packets through this VF/SF and RoCE GID table for this PCI
+will be empty.
+
+When RoCE capability is disabled in the device using port function attribute,
+VF/SF driver cannot override it.
+
+- Get RoCE capability of the VF device::
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 roce enable
+
+- Set RoCE capability of the VF device::
+
+ $ devlink port function set pci/0000:06:00.0/2 roce disable
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 roce disable
+
+migratable capability setup
+---------------------------
+Live migration is the process of transferring a live virtual machine
+from one physical host to another without disrupting its normal
+operation.
+
+User who want PCI VFs to be able to perform live migration need to
+explicitly enable the VF migratable capability.
+
+When user enables migratable capability for a VF, and the HV binds the VF to VFIO driver
+with migration support, the user can migrate the VM with this VF from one HV to a
+different one.
+
+However, when migratable capability is enable, device will disable features which cannot
+be migrated. Thus migratable cap can impose limitations on a VF so let the user decide.
+
+Example of LM with migratable function configuration:
+- Get migratable capability of the VF device::
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 migratable disable
+
+- Set migratable capability of the VF device::
+
+ $ devlink port function set pci/0000:06:00.0/2 migratable enable
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 migratable enable
+
+- Bind VF to VFIO driver with migration support::
+
+ $ echo <pci_id> > /sys/bus/pci/devices/0000:08:00.0/driver/unbind
+ $ echo mlx5_vfio_pci > /sys/bus/pci/devices/0000:08:00.0/driver_override
+ $ echo <pci_id> > /sys/bus/pci/devices/0000:08:00.0/driver/bind
+
+Attach VF to the VM.
+Start the VM.
+Perform live migration.
+
Subfunction
============
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index bede24ef44fd..f10f8eb44255 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -222,6 +222,7 @@ Userspace to kernel:
``ETHTOOL_MSG_MODULE_GET`` get transceiver module parameters
``ETHTOOL_MSG_PSE_SET`` set PSE parameters
``ETHTOOL_MSG_PSE_GET`` get PSE parameters
+ ``ETHTOOL_MSG_RSS_GET`` get RSS settings
===================================== =================================
Kernel to userspace:
@@ -263,6 +264,7 @@ Kernel to userspace:
``ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY`` PHC virtual clocks info
``ETHTOOL_MSG_MODULE_GET_REPLY`` transceiver module parameters
``ETHTOOL_MSG_PSE_GET_REPLY`` PSE parameters
+ ``ETHTOOL_MSG_RSS_GET_REPLY`` RSS settings
======================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -1687,6 +1689,33 @@ to control PoDL PSE Admin functions. This option is implementing
``IEEE 802.3-2018`` 30.15.1.2.1 acPoDLPSEAdminControl. See
``ETHTOOL_A_PODL_PSE_ADMIN_STATE`` for supported values.
+RSS_GET
+=======
+
+Get indirection table, hash key and hash function info associated with a
+RSS context of an interface similar to ``ETHTOOL_GRSSH`` ioctl request.
+
+Request contents:
+
+===================================== ====== ==========================
+ ``ETHTOOL_A_RSS_HEADER`` nested request header
+ ``ETHTOOL_A_RSS_CONTEXT`` u32 context number
+===================================== ====== ==========================
+
+Kernel response contents:
+
+===================================== ====== ==========================
+ ``ETHTOOL_A_RSS_HEADER`` nested reply header
+ ``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func
+ ``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes
+ ``ETHTOOL_A_RSS_HKEY`` binary Hash key bytes
+===================================== ====== ==========================
+
+ETHTOOL_A_RSS_HFUNC attribute is bitmap indicating the hash function
+being used. Current supported options are toeplitz, xor or crc32.
+ETHTOOL_A_RSS_INDIR attribute returns RSS indrection table where each byte
+indicates queue number.
+
Request translation
===================
@@ -1768,7 +1797,7 @@ are netlink only.
``ETHTOOL_GMODULEEEPROM`` ``ETHTOOL_MSG_MODULE_EEPROM_GET``
``ETHTOOL_GEEE`` ``ETHTOOL_MSG_EEE_GET``
``ETHTOOL_SEEE`` ``ETHTOOL_MSG_EEE_SET``
- ``ETHTOOL_GRSSH`` n/a
+ ``ETHTOOL_GRSSH`` ``ETHTOOL_MSG_RSS_GET``
``ETHTOOL_SRSSH`` n/a
``ETHTOOL_GTUNABLE`` n/a
``ETHTOOL_STUNABLE`` n/a
diff --git a/Documentation/networking/timestamping.rst b/Documentation/networking/timestamping.rst
index be4eb1242057..f17c01834a12 100644
--- a/Documentation/networking/timestamping.rst
+++ b/Documentation/networking/timestamping.rst
@@ -179,7 +179,8 @@ SOF_TIMESTAMPING_OPT_ID:
identifier and returns that along with the timestamp. The identifier
is derived from a per-socket u32 counter (that wraps). For datagram
sockets, the counter increments with each sent packet. For stream
- sockets, it increments with every byte.
+ sockets, it increments with every byte. For stream sockets, also set
+ SOF_TIMESTAMPING_OPT_ID_TCP, see the section below.
The counter starts at zero. It is initialized the first time that
the socket option is enabled. It is reset each time the option is
@@ -192,6 +193,35 @@ SOF_TIMESTAMPING_OPT_ID:
among all possibly concurrently outstanding timestamp requests for
that socket.
+SOF_TIMESTAMPING_OPT_ID_TCP:
+ Pass this modifier along with SOF_TIMESTAMPING_OPT_ID for new TCP
+ timestamping applications. SOF_TIMESTAMPING_OPT_ID defines how the
+ counter increments for stream sockets, but its starting point is
+ not entirely trivial. This option fixes that.
+
+ For stream sockets, if SOF_TIMESTAMPING_OPT_ID is set, this should
+ always be set too. On datagram sockets the option has no effect.
+
+ A reasonable expectation is that the counter is reset to zero with
+ the system call, so that a subsequent write() of N bytes generates
+ a timestamp with counter N-1. SOF_TIMESTAMPING_OPT_ID_TCP
+ implements this behavior under all conditions.
+
+ SOF_TIMESTAMPING_OPT_ID without modifier often reports the same,
+ especially when the socket option is set when no data is in
+ transmission. If data is being transmitted, it may be off by the
+ length of the output queue (SIOCOUTQ).
+
+ The difference is due to being based on snd_una versus write_seq.
+ snd_una is the offset in the stream acknowledged by the peer. This
+ depends on factors outside of process control, such as network RTT.
+ write_seq is the last byte written by the process. This offset is
+ not affected by external inputs.
+
+ The difference is subtle and unlikely to be noticed when configured
+ at initial socket creation, when no data is queued or sent. But
+ SOF_TIMESTAMPING_OPT_ID_TCP behavior is more robust regardless of
+ when the socket option is set.
SOF_TIMESTAMPING_OPT_CMSG:
Support recv() cmsg for all timestamped packets. Control messages
generated by cgit (git 2.34.1) at 2025-03-17 01:34:55 +0000