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

[Shawn Guo]

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.

Shawn