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Backport ravb driver performance improvements
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[6.1.y,cip,v2,0/9] Backport ravb driver performance improvements
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[6.1.y,cip,v2,1/9] net: ravb: Simplify poll & receive functions
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[6.1.y,cip,v2,2/9] net: ravb: Align poll function with NAPI docs
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[6.1.y,cip,v2,3/9] net: ravb: Refactor RX ring refill
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[6.1.y,cip,v2,4/9] net: ravb: Refactor GbEth RX code path
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[6.1.y,cip,v2,5/9] net: add netdev_sw_irq_coalesce_default_on()
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[6.1.y,cip,v2,6/9] net: ravb: Enable SW IRQ Coalescing for GbEth
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[6.1.y,cip,v2,7/9] net: ravb: Use NAPI threaded mode on 1-core CPUs with GbEth IP
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[6.1.y,cip,v2,8/9] net: ravb: Allocate RX buffers via page pool
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[6.1.y,cip,v2,9/9] ravb: RAVB should select PAGE_POOL
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This series includes the performance improvements present in Linux v6.11-rc1 along with dependencies. The patch commit messages have not been changed as part of this backport, so they refer to performance achieved during testing with the upstream kernel. The performance improvement achieved by applying this backport series on top of v6.1.101-cip25 is as follows, measured using iperf3: RZ/G2L: * Similar TX/RX bandwidth * 50% less CPU usage during TCP RX test * 21% less CPU usage during UDP RX test RZ/G2UL: * 6% increase in TCP TX bandwidth * 34% increase in TCP RX bandwidth * 500% increase in UDP RX bandwidth * 24% loss in UDP TX bandwidth RZ/G3S: * 38% increase in TCP TX bandwidth * 48% increase in TCP RX bandwidth * 481% increase in UDP RX bandwidth * 17% loss in UDP TX bandwidth RZ/Five: * 19% increase in TCP TX bandwidth * 225% increase in TCP RX bandwidth * >10,000% increase in UDP RX bandwidth (UDP RX bandwidth was <100kbps and unstable with v6.1.101-cip25 so it's difficult to get an exact figure here) * 6% loss in UDP TX bandwidth Small losses in UDP TX bandwidth are considered acceptable to achieve the above improvements in other test cases. If UDP TX bandwidth must be maximised for a particular use case, NAPI threaded mode can be disabled at runtime via sysfs writes. Changes v1->v2: * Added Geert's patch to ensure that PAGE_PAGE is enabled. * Added Pavel's Reviewed-by tag to patches 1-8. * Removed unnecessary whitespace in commit messages. Geert Uytterhoeven (1): ravb: RAVB should select PAGE_POOL Heiner Kallweit (1): net: add netdev_sw_irq_coalesce_default_on() Paul Barker (7): net: ravb: Simplify poll & receive functions net: ravb: Align poll function with NAPI docs net: ravb: Refactor RX ring refill net: ravb: Refactor GbEth RX code path net: ravb: Enable SW IRQ Coalescing for GbEth net: ravb: Use NAPI threaded mode on 1-core CPUs with GbEth IP net: ravb: Allocate RX buffers via page pool drivers/net/ethernet/renesas/Kconfig | 1 + drivers/net/ethernet/renesas/ravb.h | 14 +- drivers/net/ethernet/renesas/ravb_main.c | 488 +++++++++++++---------- include/linux/netdevice.h | 1 + net/core/dev.c | 16 + 5 files changed, 299 insertions(+), 221 deletions(-)