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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea7b3bad94sm4880885ad.49.2026.10.22.21.42.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2026 21:42:12 -0700 (PDT) Message-ID: <76d4ee42-c8da-485d-9623-6f65a19b0c58@oss.qualcomm.com> Date: Fri, 23 Oct 2026 12:42:08 +0800 X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH ath-next] wifi: ath12k: change MAC buffer ring size to 4096 To: Shawn Guo , Jeff Johnson Cc: Yingying Tang , linux-arm-msm@vger.kernel.org, ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, yintang@qti.qualcomm.com References: <20260610031358.2043716-1-yingying.tang@oss.qualcomm.com> <0423c93c-8359-4fd5-9ba0-17e5ed3927dc@oss.qualcomm.com> <38fc5a6d-c019-43bb-98f6-ba6a667c64e1@oss.qualcomm.com> From: Baochen Qiang Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=cZpHPXDM c=1 sm=1 tr=0 ts=6adae5a6 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=0oYm2DgIxsn4U9MLWVAA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDAxOCBTYWx0ZWRfX3FZeOnXEaqQ6 5ur8MDc3OU+qixF+n9HKdQSu2kTBeLglZO58csuwV8ufVY0QgCnNCGMP9SrHhrsq5ZR6pMuJcAV IzmsisLs4F371KHFCV7zBZlHdFaTNOU= X-Proofpoint-GUID: AJbkIhFn4qSwXTZLIHuZCc8aAssip3me X-Proofpoint-ORIG-GUID: AJbkIhFn4qSwXTZLIHuZCc8aAssip3me X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDAxOCBTYWx0ZWRfX0rb8FIK7GjBR AR60Xu6FD3Vxpb6j39Mp6Jdimj9kMhf3jwH3yK4HRoIaU1iWQWlshUHhSO1Qtv/xdEOKAIQHL// 23uztqHn/c9zuLQBQrAme7ZI357MDGfLSWuTDM4KjAeU2TJDzP2PvimbPJ1GAi1h9AVG6wZ+sPP qYjnrYR8rZqHjQ8Vea+mnqcvARmt/bbYrXZ42w4g/WpvK19M7rp4VMZJH0F7k0kXqqmhgrbcH4K X7sVPW02JxUVh/5ZovJBBPFzeAxxWtGaAHzMjhtlOjHjlA6Te/h4FpmYaBKZAYeH60MEmxlQVeX /m6vL7hmUOKMAIzBg9vGlTIb7NZUuUUJe4rHkaWTLy0XbyXHzxqTx8N8kqJENFNVJG0RxPeecuY U1LOArdQwfgcpI97n/vCetqF59Xth3wIhXrro+EaZMHzQo1QUgzvGLbPy1f5y70HS+pK7+7vyat /D/2Ms2nLEFlGsztxlQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-23_01,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 malwarescore=0 adultscore=0 priorityscore=1501 clxscore=1015 spamscore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230018 On 10/23/2026 11:44 AM, Shawn Guo wrote: > + 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 Thank you Shawn!