kernel/drivers/net/ethernet/renesas, branch linux-6.18.y

net: renesas: rswitch: fix forwarding offload statemachine

2026-02-26T22:59:23Z

[ Upstream commit e9a5073a98d940837cbb95e71eed1f28f48e7b30 ] A change of the port state of one port, caused the state of another port to change. This behvior was unintended. Fixes: b7502b1043de ("net: renesas: rswitch: add offloading for L2 switching") Signed-off-by: Michael Dege Link: https://patch.msgid.link/20260206-fix-offloading-statemachine-v3-1-07bfba07d03e@renesas.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin

net: ravb: Ensure memory write completes before ringing TX doorbell

2025-10-23T01:15:14Z

Add a final dma_wmb() barrier before triggering the transmit request (TCCR_TSRQ) to ensure all descriptor and buffer writes are visible to the DMA engine. According to the hardware manual, a read-back operation is required before writing to the doorbell register to guarantee completion of previous writes. Instead of performing a dummy read, a dma_wmb() is used to both enforce the same ordering semantics on the CPU side and also to ensure completion of writes. Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Cc: stable@vger.kernel.org Co-developed-by: Fabrizio Castro Signed-off-by: Fabrizio Castro Signed-off-by: Lad Prabhakar Reviewed-by: Niklas Söderlund Link: https://patch.msgid.link/20251017151830.171062-5-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Jakub Kicinski

net: ravb: Enforce descriptor type ordering

2025-10-23T01:15:13Z

Ensure the TX descriptor type fields are published in a safe order so the DMA engine never begins processing a descriptor chain before all descriptor fields are fully initialised. For multi-descriptor transmits the driver writes DT_FEND into the last descriptor and DT_FSTART into the first. The DMA engine begins processing when it observes DT_FSTART. Move the dma_wmb() barrier so it executes immediately after DT_FEND and immediately before writing DT_FSTART (and before DT_FSINGLE in the single-descriptor case). This guarantees that all prior CPU writes to the descriptor memory are visible to the device before DT_FSTART is seen. This avoids a situation where compiler/CPU reordering could publish DT_FSTART ahead of DT_FEND or other descriptor fields, allowing the DMA to start on a partially initialised chain and causing corrupted transmissions or TX timeouts. Such a failure was observed on RZ/G2L with an RT kernel as transmit queue timeouts and device resets. Fixes: 2f45d1902acf ("ravb: minimize TX data copying") Cc: stable@vger.kernel.org Co-developed-by: Fabrizio Castro Signed-off-by: Fabrizio Castro Signed-off-by: Lad Prabhakar Reviewed-by: Niklas Söderlund Link: https://patch.msgid.link/20251017151830.171062-4-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Jakub Kicinski

net: renesas: rswitch: Remove unneeded semicolons

2025-09-26T22:10:08Z

Semicolons after end of function braces are not needed, remove them. Signed-off-by: Geert Uytterhoeven Reviewed-by: Nikita Yushchenko Link: https://patch.msgid.link/e6b57123f319c03b3f078981cb452be49e86253b.1758719832.git.geert+renesas@glider.be Signed-off-by: Jakub Kicinski

net: renesas: rswitch: simplify rswitch_stop()

2025-09-18T08:43:33Z

rswitch_stop() opencodes for_each_set_bit(). CC: Simon Horman Reviewed-by: Nikita Yushchenko Signed-off-by: Yury Norov (NVIDIA) Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250916163516.486827-1-yury.norov@gmail.com Signed-off-by: Paolo Abeni

net: ravb: Fix -Wmaybe-uninitialized warning

2025-09-16T01:35:27Z

Fix a -Wmaybe-uninitialized warning by initializing the variable to NULL. The warning is bogus and should not happen, but fixing it allows running the check on the driver to catch potential future problems. $ make CFLAGS_ravb_main.o=-Wmaybe-uninitialized In function 'ravb_rx_csum_gbeth', inlined from 'ravb_rx_gbeth' at .../linux/drivers/net/ethernet/renesas/ravb_main.c:923:6: .../linux/drivers/net/ethernet/renesas/ravb_main.c:765:25: error: 'skb' may be used uninitialized [-Werror=maybe-uninitialized] 765 | if (unlikely(skb->len < csum_len)) | ~~~^~~~~ .../linux/include/linux/compiler.h:77:45: note: in definition of macro 'unlikely' 77 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ .../linux/drivers/net/ethernet/renesas/ravb_main.c: In function 'ravb_rx_gbeth': .../linux/drivers/net/ethernet/renesas/ravb_main.c:806:25: note: 'skb' was declared here 806 | struct sk_buff *skb; | ^~~ cc1: all warnings being treated as errors Warning was found when cross compiling using aarch64-linux-gnu-gcc (GCC) 15.1.0. Signed-off-by: Niklas Söderlund Reviewed-by: Przemek Kitszel Link: https://patch.msgid.link/20250913133229.2087822-1-niklas.soderlund+renesas@ragnatech.se Signed-off-by: Jakub Kicinski

net: ethernet: renesas: rcar_gen4_ptp: Use lockdep to verify internal usage

2025-09-12T01:34:34Z

Instead of a having a comment that the lock must be held when calling the internal helper add a lockdep check to enforce it. Signed-off-by: Niklas Söderlund Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250908154426.3062861-4-niklas.soderlund+renesas@ragnatech.se Signed-off-by: Jakub Kicinski

net: ethernet: renesas: rcar_gen4_ptp: Hide register layout

2025-09-12T01:34:33Z

With the support for multiple register layout removed all support structures can be removed from the header file. Covert to a simpler structure using defines for the register offsets. There is no functional change, only switching from looking up offsets at runtime to compile time. Signed-off-by: Niklas Söderlund Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250908154426.3062861-3-niklas.soderlund+renesas@ragnatech.se Signed-off-by: Jakub Kicinski

net: ethernet: renesas: rcar_gen4_ptp: Remove different memory layout

2025-09-12T01:34:33Z

When upstreaming the Gen4 PTP support for R-Car S4 the possibility for different memory layouts on other Gen4 SoCs was build in. It turns out this is not needed and instead needlessly makes the driver harder to read, remove the support code that would have allowed different memory layouts. This change only deals with the public functions used by other drivers, follow up work will clean up the rcar_gen4_ptp internals. Signed-off-by: Niklas Söderlund Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250908154426.3062861-2-niklas.soderlund+renesas@ragnatech.se Signed-off-by: Jakub Kicinski

net: sh_eth: Disable WoL if system can not suspend

2025-09-11T00:58:35Z

The MAC can't facilitate WoL if the system can't go to sleep. Gate the WoL support callbacks in ethtool at compile time using CONFIG_PM_SLEEP. Signed-off-by: Niklas Söderlund Reviewed-by: Andrew Lunn Reviewed-by: Geert Uytterhoeven Link: https://patch.msgid.link/20250909085849.3808169-1-niklas.soderlund+renesas@ragnatech.se Signed-off-by: Jakub Kicinski