From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id A371246DAF for ; Thu, 28 Aug 2025 06:40:52 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 9668440263; Thu, 28 Aug 2025 06:40:52 +0200 (CEST) Received: from mail-wr1-f43.google.com (mail-wr1-f43.google.com [209.85.221.43]) by mails.dpdk.org (Postfix) with ESMTP id A68E140263 for ; Thu, 28 Aug 2025 06:40:51 +0200 (CEST) Received: by mail-wr1-f43.google.com with SMTP id ffacd0b85a97d-3c51f0158d8so472073f8f.1 for ; Wed, 27 Aug 2025 21:40:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1756356051; x=1756960851; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=rHKIEIpnlMwyPEBpUaORtKs3OGP4tzr50/S2qlcdSAA=; b=OatQ6+58R/SXgWKvwYobLZru/IxK4jAJ+2tVrK7q/1lOjFH4KwwzSu6QMlOqpMS9+Y LWThmyYcTkopDk2GIKch8CRvsRTRthu7P0IftB8IBMaVVb+d17hRbhwyj4rEDv1vS45b 25oHUEjOPbV4wHA1ehWndnM3lI+0I6isKDU37GlszojIfknPGq4dcsw82zNlZMCq/qBH tOHIxQvUKNrCM7F305jRReGc2szmNKOKYSCdQVbMVy7hJUsGeZM1aC2u8UQlrRSX9DX4 RZ0asdLrIFfLZ/4YXuhfczZsa2kRD43GrmLpaHH/3odDoEeWSrXznMhEcMjH2esc3oSU qdpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756356051; x=1756960851; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=rHKIEIpnlMwyPEBpUaORtKs3OGP4tzr50/S2qlcdSAA=; b=efbz+lCBN1HkNpYBhSDvYp0mmAVXB8HbTA5kjZWG0Eb4Nz3e7oVLsYrlELOuAhjvuu Uk+BpfUZc7EBbJSAAVrDbCYU/xdgigQ2izQwRGv5U68RCCQ4+eppXf29/u3aNcxTUgki SHoFGk2C5BX8KpSajc7r7W6+GOeIbllZnNtFPHaM/Tt+SUvo2uYMG7SGuo0slsuFl5Wu 8waQbS6fp5jK95hkb9jdUcs7GoSM69goBIp6fuh5Kzqp72WnHLfGYgeHJecsqVlPBy5h sMFUP/CE1/aO1OpVjj2cp4uN/9hGI1L2A3qVP2hEyzEdF0unDE4VNIaGgqrjckzbK7Di sZ8A== X-Forwarded-Encrypted: i=1; AJvYcCXS8ZCI7OqTDc15maJ2jgCfBdOeddCcU0tGS6YMZxx4YG7rcdu/sjVmTb+Nlw+UCjab3SsZO7Q=@dpdk.org X-Gm-Message-State: AOJu0YyZujAX9FMVipkqiQ2dtz2LSegNXUnyHyua2n2Rk5n8oRP9cFoZ qlRhANQVSyrLfkwaNeq2MwOHZ5XMCJQHxs7ZUQB/fK5va8H7WJMc6zwnEqlf/He+ZZI= X-Gm-Gg: ASbGncs7UR46VxqY5fSxopUYDWGWY4v9Mc3meDPi4lbJppYOPBqzWV+9d+xfC+xDLvo hMupVR8rEitc3C9h3A93/J2VxdKT0ySeXAkvM2B2A2GsHlkRMrh3jSFFHPoFRDcQ/khBpCjy7ps KLVOAgb/zT+2xxIOaAKopSIDGnXLgjaG4E1aUT1KlV70WpOaxp6mdR1smxIQc4/94CHxvvxOEzi quciDERub7qwQSxH0R5XXaLm5RaMPf5doLTzNLJn5EoQa0GHaW6uM1LFGHHJ5GBRh/HtITFTUun nMQAR3dTUV9v89lBuvuxU8fh+Ic4/RNBCKGFTqmkbw31nRtfNs43b9H4fYj5YUaYtgSKjzBVnz7 H/IQ5rEU5XGtiFVrYOjhTd5qtJo4C9boQ6tAoIlld9Vf/h8wD6Ee4Ti4JX0Eky7aZ4T8YfoyW2j YpGvdYMV70bw== X-Google-Smtp-Source: AGHT+IEGm1E19K5lmExM3QbP+fG2FwAmLAUmIQ4KDpG0ryKVR5TbzncT2H8G0gj08zpC5Rs4rEH5Kw== X-Received: by 2002:a05:6000:2dc1:b0:3ca:4b59:2715 with SMTP id ffacd0b85a97d-3ca4b592d9amr10422338f8f.20.1756356050970; Wed, 27 Aug 2025 21:40:50 -0700 (PDT) Received: from hermes.local (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c711212566sm22185661f8f.41.2025.08.27.21.40.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Aug 2025 21:40:50 -0700 (PDT) Date: Wed, 27 Aug 2025 21:40:44 -0700 From: Stephen Hemminger To: Rongwei Liu Cc: , , , , , , , Dariusz Sosnowski , Bing Zhao Subject: Re: [PATCH v1] net/mlx5: fix probe optimization race condition Message-ID: <20250827214044.16f9baaa@hermes.local> In-Reply-To: <20250828032134.167999-1-rongweil@nvidia.com> References: <20250828032134.167999-1-rongweil@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org On Thu, 28 Aug 2025 06:21:34 +0300 Rongwei Liu wrote: > With dedicated RDMA link monitor, there are two threads > which can update the IB device port information. > > Add a new flag to avoid the race condition. Update should > go through RDMA link monitor once ready. > > Fixes: 51fb5c40c826 ("net/mlx5: optimize device probing") > Cc: rongweil@nvidia.com > Cc: stable@dpdk.org > Signed-off-by: Rongwei Liu > Acked-by: Viacheslav Ovsiienko > --- If variable is modified (with out locking) on two threads it needs to atomic or volatile.