From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 D634832D440 for ; Tue, 16 Dec 2025 07:55:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765871705; cv=none; b=dm/eEMPf09ZBK/bJJLE4oEbAvTfcSDKBi1GS8rctY37s8XddoPNv4ueQHDZGln+0jI0iP00rQ2ZGP207u52H1A+pN363wbRXHYGuRKxMm+A0jNsbR1z9VDSDzA7h9VRljzZruEpqeNL8V2tRfndDBmiNsZUE/BuTdhSv7eG59A0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765871705; c=relaxed/simple; bh=WLSVqasYiJTVyin6HRxLxdxum8ueE9wAziy3TUoPrdw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KrBcoV/GoKbpVVze4NIyHPeHUSw7sqECDCn7Mxb0XiPdovckrmbyCiqPzcpEMVc+lP8+XmzzILcvv5ATbC38JJvRFc7Ct+vpRzMI+f3CjB9cKee7+Tbwpk7evonxOdjua49O5B63v3lkrs3DrLJYHYHdkE3gWgpL4N4RFTVbjyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=kQo0H+UM; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="kQo0H+UM" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=2BHX70gh7pB5E0m+whMnbHJ2VXB0+k9OykglcNKjY3Q=; b=kQo0H+UM6meA1Pi340i7wpz8h6 TIpolmZkiqw+eQUHebyXxqt5KR5HaY1eq+fD4zKzq9FxLp786OsGY7ZTntYoKwrK86yFV4kG0+SPP fKCGzM2mar4WZtm2Ea5vmbgCXZe5drGHwxEQAEkivWGkkhudu32xE0uYPE+rKAD/rAhHnNTNHgCOz YHmkosKTrk1g8WURg/Y0KDqw18OxPgoXdwOVvZELz5PxZoVfq95ENHx2QSzTA9NHnB9Wb+XyAmQxW 5QSZJ5l4hlHqzjW2uZXIZ5Wm9DlctIbezQCadKSBapCVzqpzAP3QArUiDEzgySetmYkPRD5fkze0Q 08HJ3zuA==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vVPtd-00000004sja-00Hy; Tue, 16 Dec 2025 07:55:01 +0000 Date: Mon, 15 Dec 2025 23:55:00 -0800 From: Christoph Hellwig To: Logan Gunthorpe Cc: dmaengine@vger.kernel.org, Vinod Koul , Kelvin Cao , George Ge , Christoph Hellwig , Christophe Jaillet Subject: Re: [PATCH v11 0/3] Switchtec Switch DMA Engine Driver Message-ID: References: <20251215181649.2605-1-logang@deltatee.com> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251215181649.2605-1-logang@deltatee.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Mon, Dec 15, 2025 at 11:16:46AM -0700, Logan Gunthorpe wrote: > This is v11 of the Switchtec Switch DMA Engine Driver. We sent v10 in the > previous cycle with almost no feedback. > > To reiterate the response to the feedback we keep getting: virt-dma in > not appropriate for this driver because the hardware has a submission > queue itself. There's no sense adding a software queue when entries can > just be placed on the hardware queue. This is the same as similar dma > engine drivers which came before it: ioat and plx. > > The patchset has been rebased on v6.19-rc1. This still looks good to me.