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https://bugs.launchpad.net/bugs/1540435
Title:
Introducing ConnectX-4 Ethernet SRIOV
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
This patchset introduces the support of Ethernet SRIOV in ConnectX-4
family of 100G Ethernet NICs.
Basic Introduction:
ConnectX-4 HW architecture provides two kinds of underlying HW switches.
MPFS (Multi Physical Function Switch) or L2 Table in Software terms:
The HCA has one MPFS switch per physical port, this switch is responsible
of forwarding Unicast traffic to the various overlying Physical Functions
(PFs).
Multicast traffic is flooded amongst all the PFs, Each PF can request to
forward a unicast MAC to its E-Switch Uplink vport (which we will cover
later)
through SET_L2_TABLE_ENTRY HW command.
MPFS has five ports, four are connected to PFs (one for each) and one is
connected
directly to the Physical Port (Physical Link).
E-Switch (Ethernet Switch):
The HCA has one per physical function. The main responsibility of this
component is
to forward Unicast/Multicast and vlan tagged/untagged traffic to the various
Virtual Functions (VFs) allocated by the PF. Unlike MPFS, the PF needs to
explicitly
create the E-Switch FDB table, Which is a HW flow table managed by the PF
driver
whenever vport_group_manager capability bit is set for this PF.
E-Switch has Virtual Ports (vports) entities as its ports, vport0 and uplink
vport
are special kind of vports that represents PF vport (vport0) and uplink vport
which
is connected to the MPFS switch (if exists) as the PF external link.
vport1..vportN represent VF0..VF(N-1) egress/ingress ports.
E-Switch FDB contains forwarding rules such as:
UC MAC0 -> vport0(PF).
UC MAC1 -> vport1.
UC MAC2 -> vport2.
MC MACX -> vport0, vport2, Uplink.
MC MACY -> vport1, Uplink.
For unmatched traffic FDB has the following default rules:
Unmatched Traffic (src vport != Uplink) -> Uplink.
Unmatched Traffic (src vport == Uplink) -> vport0(PF).
NIC VPort context:
Each NIC (VF/PF) has its own vport context which will be used to store the
current
NIC vport context (UC/MC and vlan lists) and other NIC properties such as
MTU, promisc
mode, etc.. NIC (VF/PF) driver is responsible of constantly updating this
context.
FDB rules population:
Each NIC vport (VF/PF) will notify E-Switch manager of its UC/MC vport
context changes via modify vport context command, which will be
translated to an event that will be handled by E-Switch manager (PF)
which will update FDB table accordingly.
Both PF and VF use the same driver and submit commands directly to the
firmware.
The PF sees the vport_group_manager capability bit and as such runs the code
to populate the embedded switches as explained above.
The patch goes as follows:
Patches 1-2 introduces the basic PCI SRIOV functionalities and the support of
Connectx4 to enable specific VFs via enable/disable HCA commands. These two
patches will be also in use later for the IB SRIOV flow.
Patches 3-8 Introduces the basic E-Switch capabilities and commands to be
used later by
VF to modify and update its NIC vport context, and by PF (E-Switch Manager)
driver to
Query the VF NIC context and acts accordingly.
Patches 9-10 Provide the needed functionality of a NIC driver VF/PF to
support SRIOV,
mainly vport context update support.
Patch 11 ("net/mlx5: Introducing E-Switch and l2 table"), Introduces the basic
E-Switch support and infrastructure to read vport context events and to update
MPFS L2 Table of the UC mac addresses request by the PF.
Patches 12-18 Introduces SRIOV enablemenet and E-Switch FDB table management
It adds the Basic E-Swtich public API to set and get sriov properties to be
used
in PF netdev sriov ndos.
Patchset was applied ontop of commit 3f8c0f7 "gianfar: use
of_property_read_bool()"
Saeed, Eli and Or.
Eli Cohen (2):
net/mlx5_core: Modify enable/disable hca functions
net/mlx5_core: Add base sriov support
Saeed Mahameed (18):
net/mlx5: Add HW capabilities and structs for SR-IOV E-Switch.
net/mlx5: Update access functions to Query/Modify vport MAC address
net/mlx5: Introduce access functions to modify/query vport mac lists
net/mlx5: Introduce access functions to modify/query vport state
net/mlx5: Introduce access functions to modify/query vport promisc mode
net/mlx5: Introduce access functions to modify/query vport vlans
net/mlx5e: Write UC/MC list and promisc mode into vport context
net/mlx5e: Write vlan list into vport context
net/mlx5: Introducing E-Switch and l2 table
net/mlx5: E-Switch, Introduce FDB hardware capabilities
net/mlx5: E-Switch, Add SR-IOV (FDB) support
net/mlx5: E-Switch, Introduce Vport administration functions
net/mlx5: E-Switch, Introduce HCA cap and E-Switch vport context
net/mlx5: E-Switch, Introduce set vport vlan (VST mode)
net/mlx5: E-Switch, Introduce get vf statistics
net/mlx5e: Add support for SR-IOV ndos
net/mlx5e: Assign random MAC address if needed
net/mlx5: Fix query E-Switch capabilities
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