[PATCH ath-next] wifi: ath12k: change MAC buffer ring size to 4096

[Shawn Guo]

+ Jeff

On Fri, Oct 23, 2026 at 11:13:56AM +0800, Baochen Qiang wrote:
> 
> 
> On 10/23/2026 10:43 AM, Shawn Guo wrote:
> > On Fri, Oct 23, 2026 at 10:13:18AM +0800, Baochen Qiang wrote:
> >> On 10/22/2026 9:44 PM, Shawn Guo wrote:
> > 
> > [...]
> > 
> >>> I bisected drivers/net/wireless/ath/ath12k between v7.3 (broken) and
> >>> the ath tag (working). It lands on:
> >>>
> >>>   15f7603b69a8 ("wifi: ath12k: Increase RXDMA buffer ring size for default memory profile")
> >>>
> >>> The previous commit, 643f0bf93617, still has 4096 entries and is broken.
> >>> 15f7603b69a8 changes one line, .rxdma_buf_ring_size from 4096 to 8192,
> >>> and works.
> >>
> >> thanks for sharing this. I can repro it using the 481 firmware once get 15f7603b69a8 reverted.
> > 
> > Thanks for confirming!
> > 
> >> so the rule here seems that rxdma_buf_ring_size must be at least twice as large as
> >> DP_RX_MAC_BUF_RING_SIZE (I also tries four times large, it works). This rule looks
> >> reasonable to me, since WCN7850 get twos HW MACs and its firmware setups rx_mac_buf ring
> >> for each, and each ring fills itself using the buffers all from the single RXDMA buffer ring.
> >>
> >> maybe I should submit a patch mandate this rule.
> > 
> > I'm more concerned about how we would fix the regression for 7.3.x stable
> > kernel.
> 
> we can try to ask stable team to backport 15f7603b69a8 ?

Ok, I can do the backport after the commit lands mainline, assuming it's
part of Jeff's PR for 7.4 merge window.

Shawn