From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0CD59154425 for ; Fri, 28 Aug 2026 03:03:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787886213; cv=none; b=LAyVMhOF0Mpqw5seiT0Uc16NLwuarFwiXLmvUHCXjCRLZ5bQslSrwW9k1gaSW7attgbWC4xck/mvocRqwMBi7/5A9lyz1CohIl+RximnPrIki/KStMBvEj+D2Y/FMn/faDswH3uMv2B57Xsu5HqtQhwdUapf9PYcMlIHeHJoGUc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787886213; c=relaxed/simple; bh=hKjcfysmqpwkfoKcmOZNV4zNNLgROO+mCygL3RPRE0Y=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=HtgNYxEp5I+0zQatzSIBjMXIFuYmo3ZMoWwdKtLqLX6gOBawRnk7DSrded0d8550CSV1Al/VZRbcCkWNkILYckIohaGrnYTxenPttHClh5Evlg2y4rvhy8GsRonlqiRXvsymbBYFZGAS6miuKMeu6rXf4tv1iDbRTYQi3/cvQHI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to; spf=none smtp.mailfrom=dama.to; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b=uIiGQS0l; arc=none smtp.client-ip=209.85.210.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=dama.to Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b="uIiGQS0l" Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-8525efa7274so533894b3a.2 for ; Thu, 27 Aug 2026 20:03:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dama-to.20251104.gappssmtp.com; s=20251104; t=1787886211; x=1788491011; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :content-type:mime-version:references:mail-followup-to:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=S/6wjXJ5t2JcwV8iIbOzHQwgonuJXRvuDvZRhLDazjw=; b=uIiGQS0lCLCPCmusn0yZEF3h+v8Pn1tC5GSproN6glBsYySEbAvYPsHTnVkbIfdFXK EGWx4lb5Sai+vK/nEu0GJ7P5IoLkD//xpGRIFPpGC8ZCrBguyUQGZnvJS48Ym+JxgBM7 ZmTSYkBoH9XZmH7T5O5NSWfrfBQJcUBw+3ZD1IlYUg53yv/Cst0G7p5upLLQp9q7872J vNTO+5VMUz/mo1/y3WGKVWhawpOkAMM2oupWtZVc7ZG9EhnXocLxjaew5AbMzdYP2ONf JgjoJnd5SjqSM9IaAgrNd3BDDx9ZhUZMNfAQSfwUCLa1SEJQCvdVb7icPdkjVUMx1ZTV uPLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787886211; x=1788491011; h=in-reply-to:content-transfer-encoding:content-disposition :content-type:mime-version:references:mail-followup-to:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to:content-type; bh=S/6wjXJ5t2JcwV8iIbOzHQwgonuJXRvuDvZRhLDazjw=; b=QYCQNa9kasoDWYIgGE1oc0r9nGT2tvAFmeERvAAk06uK6awKQgc8QVeh6CJZ/YnMA0 xlBjYytqxXaUrT705DUfBJkETfTGrIkv8e6xfogSwP/j3stiE6SlGKr9mNU8HJJlJvQv BZIwCM3CqYWSUCq3Q0jo5BkALrfrCJZSebBFu9Vdx2DMe7M2fm68e0nRLlkDvFfHAjVR 7UifrnzcRTNOKJbQ8Y92R6CoYnrKRiKa2cI/A/AcTYDXRR4+2qf14+akdbFaA8iiMhD+ Wg3Oo7i7wmHqxi9TzDDvLAh9Km5ohQ4+pjarSLFKYP4NnuKVyGfPak+aGqZIu3r+ao9n XMUw== X-Forwarded-Encrypted: i=1; AHgh+RpQ4shfdok84DhTh39sMbAZbjZOppcyB55GPFccpj6Jh6VfvRmlH9+IWnJ9VmUhG+vbmusZOn1atqcAaPo=@vger.kernel.org X-Gm-Message-State: AFuF++m10Io81+oBZf+eySFsk8/l9haLdqYpV3YdIh1El4M2XbSjSW/U NdgXQWAc6mnFO84DKBflriX/s+b60DmJM73tcwnTJhYJIl0UBhsT9rNDUaSF09h5LOU= X-Gm-Gg: AR+sD12TB2CGEn6faJq1XKeZq8/AjaxojnEnwt2DwyzA9NjxpBlODPntpJrhTlOqYRx rbNzB5GTGEDvhOgNphvxo7+34E2Hr7t3v8F2nebVDY2fA8fHD7APwVMjbrwD2JHUYf2dl9P1ymr itbJ2bPFPuqJAe6Ez4/u+/lpbmiPl5luvmFdbepaN1t3QlzJNuwyRrtsgk0+VonulNV5fOW+uJk cxwvZFJbpBNYCwa9cCsmeEv/mAUMDysSK0b1f6gq9s1n6eTaZXqDQqMN3ARvwro6HrNUPoSIN2P o4M+q7OVSqwoImRNy2TvRs4Vh1xw0CiGS7m2Hl4P6wzrtzjg08MkT1KdV7d6mfn0Yw3EJu6LxIn 3XFO/kbpfthGgBVDa6OVqhO7nF8DaydVFYl40XGI3M9/t0NzQb/GNiXqbGowfPYfdAk9DSqJSzp 8LdGObtNF0WLkw9Fy2O3LUecDIdt19V9mLoSw1UhwQ/RspM2ebTVEc X-Received: by 2002:a05:6a00:4210:b0:853:59ed:5539 with SMTP id d2e1a72fcca58-8562aeacd01mr7858899b3a.16.1787886209642; Thu, 27 Aug 2026 20:03:29 -0700 (PDT) Received: from localhost ([2a03:2880:2ff:48::]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8569fa7d94fsm137211b3a.17.2026.08.27.20.03.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Aug 2026 20:03:28 -0700 (PDT) Date: Thu, 27 Aug 2026 20:03:27 -0700 From: Joe Damato To: Michael Chan Cc: netdev@vger.kernel.org, Pavan Chebbi , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Colin Winegarden , Rukhsana Ansari , Kalesh AP , horms@kernel.org, linux-kernel@vger.kernel.org, raphaelcf@meta.com, stable@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH net v3] bnxt_en: Bound SW TPA IDs to prevent crashes Message-ID: Mail-Followup-To: Joe Damato , Michael Chan , netdev@vger.kernel.org, Pavan Chebbi , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Colin Winegarden , Rukhsana Ansari , Kalesh AP , horms@kernel.org, linux-kernel@vger.kernel.org, raphaelcf@meta.com, stable@vger.kernel.org, llvm@lists.linux.dev References: <20260827185700.2157164-1-joe@dama.to> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Aug 27, 2026 at 05:00:29PM -0700, Michael Chan wrote: > On Thu, Aug 27, 2026 at 4:41 PM Joe Damato wrote: > > > > On Thu, Aug 27, 2026 at 04:07:16PM -0700, Michael Chan wrote: > > > On Thu, Aug 27, 2026 at 11:57 AM Joe Damato wrote: > > > > > > > @@ -3831,6 +3834,7 @@ static int bnxt_alloc_tpa_info(struct bnxt *bp) > > > > int i, rc; > > > > > > > > bp->max_tpa = MAX_TPA; > > > > + bp->max_tpa_roundup_size = MAX_TPA; > > > > > > This is strictly not needed. If we return early below, it means the > > > chip does not support TPA at all. We skip allocating the TPA array > > > for every ring, so it really makes no difference. > > > > > > BNXT_SUPPORTS_TPA() will be false if we return early. LRO and HW_GRO > > > will not be supported. So I would say it's a false positive from > > > Sashiko. Thanks. > > > > Sorry, I should have been more explicit in my last message: is it worth a > > respin to remove this? Unless I am misunderstanding something, it's harmless > > and while not necessary, might be more clear for a human reader? > > > > Yes, the extra line is harmless. But I think it will further confuse > the reader (or AI) into thinking that TPA is supported when we return > early. I slightly prefer not adding this line. If you end up > re-spinning, maybe add an extra comment explaining that TPA is not > supported when we return early? Thanks. I think I'll propose something like this for the next version: @@ -3832,6 +3835,10 @@ static int bnxt_alloc_tpa_info(struct bnxt *bp) bp->max_tpa = MAX_TPA; if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) { + /* TPA is not supported at all, so there is nothing to + * allocate. BNXT_SUPPORTS_TPA() is false in this case and + * neither LRO nor HW GRO can be enabled. + */ if (!bp->max_tpa_v2) return 0; bp->max_tpa = min_t(u16, bp->max_tpa_v2, MAX_TPA_P5); @@ -3839,6 +3846,7 @@ static int bnxt_alloc_tpa_info(struct bnxt *bp) if (bp->max_tpa <= 32 && BNXT_CHIP_P5(bp) && !BNXT_NPAR(bp)) bp->max_tpa = MAX_TPA_P5; } + bp->max_tpa_roundup_size = roundup_pow_of_two(bp->max_tpa); Because otherwise max_tpa_roundup_size would be 0 and bnxt_alloc_one_tpa_info (and other tpa functions) would use an alloc size of 0 and return ZERO_SIZE_PTR (non-NULL) which would then break checks like: if (!rxr->rx_tpa) because it would be ZERO_SIZE_PTR instead of NULL. Am I getting that right?