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Mon, 24 Mar 2025 08:49:53 +0100 Date: Mon, 24 Mar 2025 08:49:52 +0100 From: Johan Hovold To: Clayton Craft Cc: Johan Hovold , Jeff Johnson , Miaoqing Pan , Steev Klimaszewski , Jens Glathe , ath11k@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] wifi: ath11k: fix rx completion meta data corruption Message-ID: References: <20250321145302.4775-1-johan+linaro@kernel.org> <51a59b41-4214-4e24-bfe8-3d8174ba1a3b@craftyguy.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51a59b41-4214-4e24-bfe8-3d8174ba1a3b@craftyguy.net> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250324_004955_841264_40BC178F X-CRM114-Status: GOOD ( 24.76 ) X-BeenThere: ath11k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath11k" Errors-To: ath11k-bounces+ath11k=archiver.kernel.org@lists.infradead.org On Sun, Mar 23, 2025 at 11:15:54PM -0700, Clayton Craft wrote: > On 3/21/25 07:53, Johan Hovold wrote: > > Add the missing memory barrier to make sure that the REO dest ring > > descriptor is read after the head pointer to avoid using stale data on > > weakly ordered architectures like aarch64. > > > > This may fix the ring-buffer corruption worked around by commit > > f9fff67d2d7c ("wifi: ath11k: Fix SKB corruption in REO destination > > ring") by silently discarding data, and may possibly also address user > > reported errors like: > > > > ath11k_pci 0006:01:00.0: msdu_done bit in attention is not set > > > > Tested-on: WCN6855 hw2.1 WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41 > > > > Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") > > Cc: stable@vger.kernel.org # 5.6 > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=218005 > > Signed-off-by: Johan Hovold > > --- > > > > As I reported here: > > > > https://lore.kernel.org/lkml/Z9G5zEOcTdGKm7Ei@hovoldconsulting.com/ > > > > the ath11k and ath12k appear to be missing a number of memory barriers > > that are required on weakly ordered architectures like aarch64 to avoid > > memory corruption issues. > > > > Here's a fix for one more such case which people already seem to be > > hitting. > > > > Note that I've seen one "msdu_done" bit not set warning also with this > > patch so whether it helps with that at all remains to be seen. I'm CCing > > Jens and Steev that see these warnings frequently and that may be able > > to help out with testing. > > Before this patch I was seeing this "msdu_done bit" an average of about > 40 times per hour... e.g. a recent boot period of 43hrs saw 1600 of > these msgs. I've been testing this patch for about 10 hours now > connected to the same network etc, and haven't seen this "msdu_done bit" > message once. So, even if it's not completely resolving this for > everyone, it seems to be a huge improvement for me. > > 0006:01:00.0 Network controller: Qualcomm Technologies, Inc QCNFA765 > Wireless Network Adapter (rev 01) > ath11k_pci 0006:01:00.0: chip_id 0x2 chip_family 0xb board_id 0x8c > soc_id 0x400c0210 > ath11k_pci 0006:01:00.0: fw_version 0x11088c35 fw_build_timestamp > 2024-04-17 08:34 fw_build_id > WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41 > > Tested-by: Clayton Craft Thanks for testing and confirming my suspicion. Johan