From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C03803A1A23; Tue, 4 Aug 2026 21:55:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785880546; cv=none; b=AUwdvRC0Kn1pAYyvmkc3RLJkL2HKTt0iujwU+hR9/eAurzVTHCWJQvnkBOR2QmvqewV8kQhKiz7nGpc42U12pgIX/jTZZjSuyL5wgT44MtJK6nZ23uCNrRJoNxI+e3HbqWBWSM1ppMJjwW31KBFgGwWM9mPAMe0WcD5pa5Ug/D4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785880546; c=relaxed/simple; bh=kT1azf3X8y4IT6vZQyh0JezAI+RYBQ+2ytkS3ld8T8U=; h=Message-ID:Date:MIME-Version:To:Cc:References:From:In-Reply-To: Content-Type:Subject; b=Zl8FPbjpeD+xfsYIBcmVhit1cD7Q0SxniEX9Fqx5l999m8FICiWY4gfM1LoM8NsFM0jboZla7010g79RWIb+SXBqU8b/nPL8aMhjd2Ke9nEIclmndJyTbAk/xDvGX0XWMsF5MxS+PN8AvUz5940WDl7Axu9OcVLYZ4lLfHf6vIU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=OeuGrtOW; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="OeuGrtOW" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:In-Reply-To:From:References:Cc:To: MIME-Version:Date:Message-ID:content-disposition; bh=Kz8BPKp3Ug6p/fQkR2kl6+0G/24Zo28yOS4kq6jQtPU=; b=OeuGrtOWeUNrHxsV0vV/TD0m5m DJsZJLLhzuWxwT1FIerbsrKRCLPEb5joo5o4Na89yxDVNIZZUrBzhIYMApPlK311mxTWlhHy450hL HpnNN2+uiZFBKYvrNgoi+VhzYelDzVL4fAie8mz+V4DGYTQO6ZRj6qvTA1uh3bzqb46bkAwdJY769 JTo15xk5jJIHvHkMd+v2xAQbZJhIGxONLoEXwaq+vsyHsyc/luRjQXWMLdzmk145/s0z30wQjBod0 VrVMBNNzZPTS7i7bvu6unEiLtmPFsywgSTLedR+7b4AHYOBtBguXn4f6koCOekegoUel8sAKxsJ4A Usbv2QpQ==; Received: from guinness.priv.deltatee.com ([172.16.1.162]) by ale.deltatee.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.2) (envelope-from ) id 1wrN6t-000000002SS-1aeE; Tue, 04 Aug 2026 15:55:44 -0600 Message-ID: <694d33b8-8f27-4e87-bc3e-f07e98a05091@deltatee.com> Date: Tue, 4 Aug 2026 15:55:43 -0600 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Leon Romanovsky , Bjorn Helgaas , Jonathan Corbet , Shuah Khan , Alex Williamson Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org References: <20260802-fix-p2p-acs-v1-0-a7c5eb64fff6@nvidia.com> <20260802-fix-p2p-acs-v1-5-a7c5eb64fff6@nvidia.com> Content-Language: en-CA From: Logan Gunthorpe In-Reply-To: <20260802-fix-p2p-acs-v1-5-a7c5eb64fff6@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: leon@kernel.org, bhelgaas@google.com, corbet@lwn.net, skhan@linuxfoundation.org, alex@shazbot.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org X-SA-Exim-Mail-From: logang@deltatee.com X-Spam-Level: Subject: Re: [PATCH 05/13] PCI: Add ACS egress control vector accessor X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) On 2026-08-02 09:09, Leon Romanovsky wrote: > From: Leon Romanovsky > > Whether ACS P2P Egress Control routes, redirects, or blocks a peer-to-peer > request depends on the Egress Control Vector bit for the target port, not > on the enable bit alone (PCIe r7.0, sec 6.12.3). > > Provide a helper to read that bit for a peer Root or Switch Downstream > Port. Report an unreadable or uncovered vector as an error rather than as > a clear bit, so callers do not mistake it for permission to route > directly. > > Signed-off-by: Leon Romanovsky Reviewed-by: Logan Gunthorpe