From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 044031FDE19 for ; Sun, 18 May 2025 06:42:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747550567; cv=none; b=MlkAUwEeBaGyj2GwSK0cP70OCla2LI0My3lcGZLusCC0jpxBcPa2u8Kq54Oi6ghqBNxKyATZ/4XHbxwy78LrzUSAyFsI1+rU23smSlSStd7UgFa0YT96wGnV2E4toObKw5h2r28ho8US0oZnXzSiPOXZRTLaxO6Ts1ROuB5HIVA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747550567; c=relaxed/simple; bh=ezJL7GLVyvwrh6XqZKLUL1k3ZwdgZ8lVGWbU8kDm1FU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YLT7b9/FvoeefTmROeUNSIGCUTR2I11u3IRUCXYBpSKEvQK4v20sE0/C3g7pRbBTZfNYnpr0VScC6r7XmNbPTQPzv5HVbFE1rRy6Wm0Jq/Bu5sbHvqjZQ0R6YFYFFXbaY2bHwtZByHJCz8Lu/4Zav5tleVCAe4SFIthzkYcZgh8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aG0++5kB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aG0++5kB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7B38C4CEE7; Sun, 18 May 2025 06:42:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747550566; bh=ezJL7GLVyvwrh6XqZKLUL1k3ZwdgZ8lVGWbU8kDm1FU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=aG0++5kBwmnGoBa2TQbF2xTXchDzoCaqq86ISaxRS7XSZsSL9DEP77BQwVcqrnvwS x3XZaJ7SMmbrBE7xw9lmkYNBSx5IMI0Da9StI0G+fBrBPm4TKwBgFmdQNwxvgYc93j qw4TbftNNRvDV2OqXYYwQueSVEkyQEHCsbZxMnlcPWXBX68nHEPD7OjWzS7jqHk98A P6X0kU1BXMMSIaHBqTKoh8HhJaaCqE0Bk3SA4//nOyP7CAePZYA0C7059+I9yXlq7w FSLJ3tQ8Aa2KuZRseqa3xyn7Z+gszi6PasQP595xLZiyJ+PupoXwOt8JLFY9SBpzhi VMYb/l3SVOtiw== Date: Sun, 18 May 2025 09:42:41 +0300 From: Leon Romanovsky To: Michael Margolin Cc: jgg@nvidia.com, linux-rdma@vger.kernel.org, sleybo@amazon.com, matua@amazon.com, gal.pressman@linux.dev, Daniel Kranzdorf , Yonatan Nachum Subject: Re: [PATCH for-next] RDMA/efa: Add CQ with external memory support Message-ID: <20250518064241.GC7435@unreal> References: <20250515145040.6862-1-mrgolin@amazon.com> Precedence: bulk X-Mailing-List: linux-rdma@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: <20250515145040.6862-1-mrgolin@amazon.com> On Thu, May 15, 2025 at 02:50:40PM +0000, Michael Margolin wrote: > Add an option to create CQ using external memory instead of allocating > in the driver. The memory can be passed from userspace by dmabuf fd and > an offset. EFA is unique here. This patch is missing description of why it is needed, and why existing solutions if any exist, can't be used. Thanks