Merge branch 'intel-wired-lan-driver-updates-2025-01-06-igb-igc-ixgbe-ixgbevf-i40e...

Tony Nguyen says:

====================
Intel Wired LAN Driver Updates 2025-01-06 (igb, igc, ixgbe, ixgbevf, i40e, fm10k)

For igb:

Sriram Yagnaraman and Kurt Kanzenbach add support for AF_XDP
zero-copy.

Original cover letter:
The first couple of patches adds helper functions to prepare for AF_XDP
zero-copy support which comes in the last couple of patches, one each
for Rx and TX paths.

As mentioned in v1 patchset [0], I don't have access to an actual IGB
device to provide correct performance numbers. I have used Intel 82576EB
emulator in QEMU [1] to test the changes to IGB driver.

The tests use one isolated vCPU for RX/TX and one isolated vCPU for the
xdp-sock application [2]. Hope these measurements provide at the least
some indication on the increase in performance when using ZC, especially
in the TX path. It would be awesome if someone with a real IGB NIC can
test the patch.

AF_XDP performance using 64 byte packets in Kpps.
Benchmark:	XDP-SKB		XDP-DRV		XDP-DRV(ZC)
rxdrop		220		235		350
txpush		1.000		1.000		410
l2fwd 		1.000		1.000		200

AF_XDP performance using 1500 byte packets in Kpps.
Benchmark:	XDP-SKB		XDP-DRV		XDP-DRV(ZC)
rxdrop		200		210		310
txpush		1.000		1.000		410
l2fwd 		0.900		1.000		160

[0]: https://lore.kernel.org/intel-wired-lan/20230704095915.9750-1-sriram.yagnaraman@est.tech/
[1]: https://www.qemu.org/docs/master/system/devices/igb.html
[2]: https://github.com/xdp-project/bpf-examples/tree/master/AF_XDP-example

Subsequent changes and information can be found here:
https://lore.kernel.org/intel-wired-lan/20241018-b4-igb_zero_copy-v9-0-da139d78d796@linutronix.de/

Yue Haibing converts use of ERR_PTR return to traditional error code
which resolves a smatch warning.

For igc:

Song Yoong Siang allows for the XDP program to be hot-swapped.

Yue Haibing converts use of ERR_PTR return to traditional error code
which resolves a smatch warning.

Joe Damato adds sets IRQ and queues to NAPI instances to allow for
reporting via netdev-genl API.

For ixgbe:

Yue Haibing converts use of ERR_PTR return to traditional error code
which resolves a smatch warning.

For ixgbevf:

Yue Haibing converts use of ERR_PTR return to traditional error code
which resolves a smatch warning.

For i40e:

Alex implements "mdd-auto-reset-vf" private flag to automatically reset
VFs when encountering an MDD event.

For fm10k:

Dr. David Alan Gilbert removes an unused function.
====================

Link: https://patch.msgid.link/20250106221929.956999-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>