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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea7b369900sm4424225ad.34.2026.10.22.20.13.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2026 20:14:00 -0700 (PDT) Message-ID: <38fc5a6d-c019-43bb-98f6-ba6a667c64e1@oss.qualcomm.com> Date: Fri, 23 Oct 2026 11:13:56 +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 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> From: Baochen Qiang Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: s9TyBZhnuvGl-n6apP7fyhd1-pXFcsEu X-Authority-Analysis: v=2.4 cv=cPR1IVeN c=1 sm=1 tr=0 ts=6adad0fb cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=0oYm2DgIxsn4U9MLWVAA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDAxMiBTYWx0ZWRfX9G6Xetth0q1k xZp/mATKcet3ecsYAZQrZTWs4089eeJj7rHoYp/OZc2BTZdVZ9DHAZSftQm2h3VB9pdkx0muSIt CT1O4Z0EvIgenTwKJ7O2AjwAvWOVPFU= X-Proofpoint-ORIG-GUID: s9TyBZhnuvGl-n6apP7fyhd1-pXFcsEu X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDAxMiBTYWx0ZWRfX/nrQPuhOVy+V h2ptwYlU/GKI64I5TGrsEG3fh05EAnGwMIVWCDRKBqw+Vpo5Qi77mBxx7W0aGonPiZQxWxfr9K9 Xy2bGbcwgGIowftWjUYWhXWi2NJYjT+OHJmdR1WuYl404L1aD7/CsIesjd/W6yFxrWU2aSFEYpF 9U7JqEoOJI4ju7ETdFtCxSJEUKd2RaU/NhRvzwN/1PDkfmCxoKFt3gUYZvBkLmalkx2xqMRCFCQ UfuJiuK2hgY0/8xAj8m55rwUs5qt3mScLkqWy3IbYofnu5gZyb7bZloRw2O8taE9z7iQMQWRYnQ nN5mkQyOj+RmXcUhVO24TocgnWTXUS9FSyf+pvBalz0K+FDVQKfbbSKCF4BgMGDcYlZ4qs2JF8H e0pGRQ4AO3HwikRoMEgZbycmvk+HfsNSu6iuTlYfi1lGDOHPvpPtCTcL1qnJxFI9C0wVVVP4NXX uJvZRgQqS/GKPR0ZHqg== 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 adultscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230012 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 ?