From patchwork Mon Feb 26 10:29:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13571879 X-Patchwork-Delegate: snitzer@redhat.com 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 65FCA381A1; Mon, 26 Feb 2024 10:31:16 +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=1708943477; cv=none; b=qwdFOOxO553VgozKTCtIrXOWDL8FZW/8JpQNCF/tE3MDu31We7uv14nHTcJPKOvCg3xNUOGfrkZExRW+96z9RpVMJUaS9EL/kRUxFPvkVVAHfSQca85g1CJ3P198eyf7CjMEQsunCJawcXrkwpad0V2MA/jqmsXMkmTYDRKNH64= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708943477; c=relaxed/simple; bh=tOmNqTt6Uod/QfwH0I/6BBHuD/cSjNyPVCopoGh7ipk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=VEWjg1lHMgXdAZBo5UASgKBht44rH07yClM3YkxGMur0GAAK0XW2KwuSkSY3rfwSLePPeH/4k+hc4js0i2LJx6DtkY3zoiXiTeK6O72nvLuUmY0oi1/ZubH7yweM98lwSBz3uwQu+cSzMtVxZfZEVKRrS1jUGeAPnlIKDPNMd2Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=dXrfya3W; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de 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="dXrfya3W" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=CBcRvD9T7h9nmDg518Gqzpn+ib6AyjtQBtWpmonmt1k=; b=dXrfya3W9gSuHBTkhU2VQBpSQK iNB741ba7FxCT80GvUmGFhMUdXa+1P8cqKVQDTUFBpJNAdWsjjqo0BN9f+dmvRBBLq2dRdHwPY1/P anpNEiIoerHOPxwO0RVEU3JrCjP7WbO3Qqr7VWjl7vcsbF9j46YsaGe5Fn5NiA0s1tRU6sm5F1Tkz fbpjTOCGkMPjOFVxXCXDbIJ9jUzcQarNdEtlddkbroora3XSbuOI28QPhWpKpToHGxyS/LdM4qeOw Ok3UHl1G1iP/t3BVlHsTgnL+EZi4lm/c+vbMsITJm7F1zm0PZoJgKJlB1Ip07BmciTkhJKrn/efXb gfZ+ydlA==; Received: from 213-147-167-65.nat.highway.webapn.at ([213.147.167.65] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1reYGP-000000004we-0FOJ; Mon, 26 Feb 2024 10:31:14 +0000 From: Christoph Hellwig To: Jens Axboe , Mike Snitzer , Mikulas Patocka , Song Liu , Yu Kuai , Philipp Reisner , Lars Ellenberg , =?utf-8?q?Christoph_B=C3=B6hmwa?= =?utf-8?q?lder?= Cc: drbd-dev@lists.linbit.com, dm-devel@lists.linux.dev, linux-block@vger.kernel.org, linux-raid@vger.kernel.org Subject: [PATCH 11/16] drbd: refactor drbd_reconsider_queue_parameters Date: Mon, 26 Feb 2024 11:29:59 +0100 Message-Id: <20240226103004.281412-12-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240226103004.281412-1-hch@lst.de> References: <20240226103004.281412-1-hch@lst.de> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Split out a drbd_max_peer_bio_size helper for the peer I/O size, and condense the various checks to a nested min3(..., max())) instead of using a lot of local variables. Signed-off-by: Christoph Hellwig --- drivers/block/drbd/drbd_nl.c | 84 +++++++++++++++++++++--------------- 1 file changed, 49 insertions(+), 35 deletions(-) diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 43747a1aae4353..9135001a8e572d 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1189,6 +1189,33 @@ static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc) return 0; } +static unsigned int drbd_max_peer_bio_size(struct drbd_device *device) +{ + /* + * We may ignore peer limits if the peer is modern enough. From 8.3.8 + * onwards the peer can use multiple BIOs for a single peer_request. + */ + if (device->state.conn < C_WF_REPORT_PARAMS) + return device->peer_max_bio_size; + + if (first_peer_device(device)->connection->agreed_pro_version < 94) + return min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET); + + /* + * Correct old drbd (up to 8.3.7) if it believes it can do more than + * 32KiB. + */ + if (first_peer_device(device)->connection->agreed_pro_version == 94) + return DRBD_MAX_SIZE_H80_PACKET; + + /* + * drbd 8.3.8 onwards, before 8.4.0 + */ + if (first_peer_device(device)->connection->agreed_pro_version < 100) + return DRBD_MAX_BIO_SIZE_P95; + return DRBD_MAX_BIO_SIZE; +} + static void blk_queue_discard_granularity(struct request_queue *q, unsigned int granularity) { q->limits.discard_granularity = granularity; @@ -1303,48 +1330,35 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi fixup_discard_support(device, q); } -void drbd_reconsider_queue_parameters(struct drbd_device *device, struct drbd_backing_dev *bdev, struct o_qlim *o) +void drbd_reconsider_queue_parameters(struct drbd_device *device, + struct drbd_backing_dev *bdev, struct o_qlim *o) { - unsigned int now, new, local, peer; - - now = queue_max_hw_sectors(device->rq_queue) << 9; - local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */ - peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */ + unsigned int now = queue_max_hw_sectors(device->rq_queue) << + SECTOR_SHIFT; + unsigned int new; if (bdev) { - local = queue_max_hw_sectors(bdev->backing_bdev->bd_disk->queue) << 9; - device->local_max_bio_size = local; - } - local = min(local, DRBD_MAX_BIO_SIZE); - - /* We may ignore peer limits if the peer is modern enough. - Because new from 8.3.8 onwards the peer can use multiple - BIOs for a single peer_request */ - if (device->state.conn >= C_WF_REPORT_PARAMS) { - if (first_peer_device(device)->connection->agreed_pro_version < 94) - peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET); - /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */ - else if (first_peer_device(device)->connection->agreed_pro_version == 94) - peer = DRBD_MAX_SIZE_H80_PACKET; - else if (first_peer_device(device)->connection->agreed_pro_version < 100) - peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */ - else - peer = DRBD_MAX_BIO_SIZE; + struct request_queue *b = bdev->backing_bdev->bd_disk->queue; - /* We may later detach and re-attach on a disconnected Primary. - * Avoid this setting to jump back in that case. - * We want to store what we know the peer DRBD can handle, - * not what the peer IO backend can handle. */ - if (peer > device->peer_max_bio_size) - device->peer_max_bio_size = peer; + device->local_max_bio_size = + queue_max_hw_sectors(b) << SECTOR_SHIFT; } - new = min(local, peer); - if (device->state.role == R_PRIMARY && new < now) - drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now); - - if (new != now) + /* + * We may later detach and re-attach on a disconnected Primary. Avoid + * decreasing the value in this case. + * + * We want to store what we know the peer DRBD can handle, not what the + * peer IO backend can handle. + */ + new = min3(DRBD_MAX_BIO_SIZE, device->local_max_bio_size, + max(drbd_max_peer_bio_size(device), device->peer_max_bio_size)); + if (new != now) { + if (device->state.role == R_PRIMARY && new < now) + drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", + new, now); drbd_info(device, "max BIO size = %u\n", new); + } drbd_setup_queue_param(device, bdev, new, o); }