From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 864BB468C0A for ; Wed, 2 Sep 2026 20:06:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788379571; cv=none; b=A54MUT6CtZZR/1qyOaRs8UGStzOFZWSoldf0E/o2EnW5RGyzAm4YtxBPoGM+PJ0XNORQwY1mr1YI6cSEAYSIjg+bsDN/5pciz+IyzoC2WZsJkcYtxBB1SFna3AmJEwnBzdbU1Ud5GPqJ0N1B19LTaMI4FFjsAdo6GdOzc1jCTIg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788379571; c=relaxed/simple; bh=00jeLAyGx8pUqOu+C12Ta11isenUJ5gOIoXRiGQ/vOg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WTCBkfizP26V8ajzFOqifFdXBTIYg1LiV6zWtvIALbJZ4LSNuLcBoQahEP3T/rc9dCJGpgHqK3wyVjFHXP0Sh13UZXNvPgosADTG3+ddXwd5hDqqnAQE0jc4gYmQHYn6VxA+ndtzqla2ZzO9Hsj0hLhxIy1wkXmeeasT9pyDFIk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bGJQaJfV; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bGJQaJfV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1788379568; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7S+46ev46/4yG1E8XUsVniDJoHCi+hDFBp54jOlRy1g=; b=bGJQaJfV3BLZkxURikc4zQ/EOnhLJu/IZ7uuFH7rOaSxzYGze8inHlt/2wlThPQsfyVxpE yE0/GaDShRyaSeaa1RCswBuHvlOdSaZN7nNE/23zZ47kh0bGnEejm671RPRVsnwRNIuxzu PXU/yRyEYMiNyiuV0E0RAWurTtKlqYw= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-687-206uQ71GPvKtm7JkxKrxQQ-1; Wed, 02 Sep 2026 16:06:05 -0400 X-MC-Unique: 206uQ71GPvKtm7JkxKrxQQ-1 X-Mimecast-MFC-AGG-ID: 206uQ71GPvKtm7JkxKrxQQ_1788379561 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id ECF571955D99; Wed, 2 Sep 2026 20:06:00 +0000 (UTC) Received: from jtaubepe-thinkpadx1carbongen12.ibmlowe.csb (unknown [10.17.16.153]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2590A1955F02; Wed, 2 Sep 2026 20:05:57 +0000 (UTC) From: Jesse Taube To: linux-nvme@lists.infradead.org Cc: linux-scsi@vger.kernel.org, Jonathan Corbet , Shuah Khan , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , Justin Tee , Naresh Gottumukkala , Paul Ely , Chaitanya Kulkarni , "James E.J. Bottomley" , "Martin K. Petersen" , Nilesh Javali , GR-QLogic-Storage-Upstream@marvell.com, Hannes Reinecke , Jesse Taube , "Gustavo A. R. Silva" , John Meneghini , Bryan Gurney , Chris Leech , "Ewan D . Milne" , shinichiro.kawasaki@wdc.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH v2 2/7] nvme-multipath: numa support for marginal paths Date: Wed, 2 Sep 2026 16:05:42 -0400 Message-ID: <20260902200547.184734-3-jtaubepe@redhat.com> In-Reply-To: <20260902200547.184734-1-jtaubepe@redhat.com> References: <20260902200547.184734-1-jtaubepe@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 FPIN LI (link integrity) messages are received when the attached fabric detects hardware errors. In response to these messages I/O should be directed away from the affected ports, and only used if no other non-marginal paths are available. To handle this a new controller flag 'NVME_CTRL_MARGINAL' is added which will cause the multipath scheduler to skip these paths when checking for 'optimized' paths. Signed-off-by: Jesse Taube --- This is a distinct change from the previous commit which treated marginal paths as non-optimized but still usable. This changes the priority of marginal paths to be lower than non-optimized paths. V10 -> V1: - New commit V1 -> V2: - Rewrite --- drivers/nvme/host/multipath.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 9b9a657fa330..dbf09cdda815 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -305,16 +305,45 @@ static bool nvme_path_is_disabled(struct nvme_ns *ns) return false; } +static bool nvme_path_is_usable(struct nvme_ns *ns) +{ + /* Only NVME_ANA_OPTIMIZED and NVME_ANA_NONOPTIMIZED are usable */ + return !nvme_path_is_disabled(ns) && + (ns->ana_state == NVME_ANA_OPTIMIZED || + ns->ana_state == NVME_ANA_NONOPTIMIZED); +} + +static bool nvme_all_paths_marginal(struct nvme_ns_head *head) +{ + struct nvme_ns *ns; + + list_for_each_entry_srcu(ns, &head->list, siblings, + srcu_read_lock_held(&head->srcu)) { + /* skip paths which can not be used */ + if (!nvme_path_is_usable(ns)) + continue; + if (!nvme_ctrl_is_marginal(ns->ctrl)) + return false; + } + + return true; +} + static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node) { int found_distance = INT_MAX, fallback_distance = INT_MAX, distance; struct nvme_ns *found = NULL, *fallback = NULL, *ns; + bool need_marginal = nvme_all_paths_marginal(head); list_for_each_entry_srcu(ns, &head->list, siblings, srcu_read_lock_held(&head->srcu)) { if (nvme_path_is_disabled(ns)) continue; + /* Skip marginal paths unless we need to use them */ + if (!need_marginal && nvme_ctrl_is_marginal(ns->ctrl)) + continue; + if (ns->ctrl->numa_node != NUMA_NO_NODE && READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA) distance = node_distance(node, ns->ctrl->numa_node); @@ -339,6 +368,7 @@ static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node) } } + /* No optimized path found, use the fallback */ if (!found) found = fallback; if (found) @@ -444,7 +474,8 @@ static struct nvme_ns *nvme_queue_depth_path(struct nvme_ns_head *head) static inline bool nvme_path_is_optimized(struct nvme_ns *ns) { return nvme_ctrl_state(ns->ctrl) == NVME_CTRL_LIVE && - ns->ana_state == NVME_ANA_OPTIMIZED; + ns->ana_state == NVME_ANA_OPTIMIZED && + !nvme_ctrl_is_marginal(ns->ctrl); } static struct nvme_ns *nvme_numa_path(struct nvme_ns_head *head) -- 2.55.0