On Wed, 4 Mar 2026 04:50:29 +0000 "Jasper Tran O'Leary" <[email protected]> wrote:
> This patch series adds flow steering support to the Google Virtual > Ethernet (gve) driver. This functionality allows traffic to be directed > to specific receive queues based on user-specified flow patterns. > > The series includes foundational support for extended admin queue > commands needed to handle flow rules, the specific adminqueue commands > for flow rule management, and the integration with the DPDK rte_flow > API. The series adds support flow matching on the following protocols: > IPv4, IPv6, TCP, UDP, SCTP, ESP, and AH. > > Patch Overview: > > 1. "net/gve: add flow steering device option" checks for and enables > the flow steering capability in the device options during > initialization. > 2. "net/gve: introduce extended adminq command" adds infrastructure > for sending extended admin queue commands. These commands use a > flexible buffer descriptor format required for flow rule management. > 3. "net/gve: add adminq commands for flow steering" implements the > specific admin queue commands to add and remove flow rules on the > device, including handling of rule IDs and parameters. > 4. "net/gve: add rte flow API integration" exposes the flow steering > functionality via the DPDK rte_flow API. This includes strict > pattern validation, rule parsing, and lifecycle management (create, > destroy, flush). It ensures thread-safe access to the flow subsystem > and proper resource cleanup during device reset. > > Jasper Tran O'Leary (2): > net/gve: add adminq commands for flow steering > net/gve: add rte flow API integration > > Vee Agarwal (2): > net/gve: add flow steering device option > net/gve: introduce extended adminq command > > doc/guides/nics/features/gve.ini | 12 + > doc/guides/nics/gve.rst | 27 + > doc/guides/rel_notes/release_26_03.rst | 1 + > drivers/net/gve/base/gve.h | 3 +- > drivers/net/gve/base/gve_adminq.c | 118 ++++- > drivers/net/gve/base/gve_adminq.h | 57 +++ > drivers/net/gve/gve_ethdev.c | 83 +++- > drivers/net/gve/gve_ethdev.h | 46 ++ > drivers/net/gve/gve_flow_rule.c | 658 +++++++++++++++++++++++++ > drivers/net/gve/gve_flow_rule.h | 65 +++ > drivers/net/gve/meson.build | 1 + > 11 files changed, 1066 insertions(+), 5 deletions(-) > create mode 100644 dpdk/drivers/net/gve/gve_flow_rule.c > create mode 100644 dpdk/drivers/net/gve/gve_flow_rule.h > Applied to next-net The detailed review report if you are interested. Reviewed the v4 series. Overall this is well-structured — locking discipline is sound, create/destroy/flush paths handle errors correctly with proper resource cleanup, and the bitmap slot is restored on adminq failure. Patches 1/4 and 2/4 are clean. A few items on 3/4 and 4/4: Patch 3/4: [Warning] struct gve_flow_spec has a padding hole after the tos/tclass u8 field (37 bytes of data, padded to 40 by the compiler). Callers zero-initialize today so no live bug, but consider adding GVE_CHECK_STRUCT_LEN for gve_flow_spec and gve_flow_rule_params to guard against future changes, consistent with other adminq structures. Patch 4/4: [Warning] In gve_setup_flow_subsystem, the rte_zmalloc failure path does goto free_flow_rule_bmp which calls gve_flow_free_bmp(priv). This is safe (rte_free(NULL) is a no-op) but misleading — the label says "free" when there's nothing to free. Cleaner to just return -ENOMEM directly on the first failure. [Warning] gve_dev_reset tears down the flow subsystem and re-initializes via gve_init_priv, but does not destroy/recreate flow_rule_lock. This works today because gve_teardown_flow_subsystem doesn't destroy the mutex (only gve_dev_close does), but it's worth a comment to document this invariant.
