From patchwork Mon Apr 10 19:10:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Leech X-Patchwork-Id: 13206660 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50BA4C77B61 for ; Mon, 10 Apr 2023 19:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229571AbjDJTMA (ORCPT ); Mon, 10 Apr 2023 15:12:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229523AbjDJTL7 (ORCPT ); Mon, 10 Apr 2023 15:11:59 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0957E1718 for ; Mon, 10 Apr 2023 12:11:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681153876; 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=ingp0g90/6/pJ2ejREIp3ERyxmWHuGCQrWwdDlHfBW0=; b=QD6nevNCKxQOhyJACEljfBoM8dt09tOLZrgAwWxeigfPvBbyKWqqdPGbwUwEZtKxdytCyB yfqZsuY2i3BOOljF/TDt8y/qkRvvC00pkRGQc2kfBNptTMjR/B88hS3ZBByaA4l+B0sX2T KDkIxrEYV6EwkbE0go/kHZOAwD+TRWI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-76-4hfpA3S2N629Bubp-1eNOA-1; Mon, 10 Apr 2023 15:11:12 -0400 X-MC-Unique: 4hfpA3S2N629Bubp-1eNOA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CC9F7101A54F; Mon, 10 Apr 2023 19:11:11 +0000 (UTC) Received: from localhost.redhat.com (unknown [10.2.16.6]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B28E40C83AC; Mon, 10 Apr 2023 19:11:11 +0000 (UTC) From: Chris Leech To: linux-scsi@vger.kernel.org, open-iscsi@googlegroups.com, Hannes Reinecke , Lee Duncan , netdev@vger.kernel.org Cc: Chris Leech Subject: [PATCH 10/11] iscsi: make session and connection lists per-net Date: Mon, 10 Apr 2023 12:10:32 -0700 Message-Id: <20230410191033.1069293-2-cleech@redhat.com> In-Reply-To: <83de4002-6846-2f90-7848-ef477f0b0fe5@suse.de> References: <83de4002-6846-2f90-7848-ef477f0b0fe5@suse.de> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Eliminate the comparisions on list lookups, and it will make it easier to shut down session on net namespace exit in the next patch. Signed-off-by: Chris Leech Reviewed-by: Hannes Reinecke --- drivers/scsi/scsi_transport_iscsi.c | 104 ++++++++++++++++------------ 1 file changed, 61 insertions(+), 43 deletions(-) diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 9a176ea0d866..3a068d8eca2d 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -1734,17 +1734,16 @@ static DECLARE_TRANSPORT_CLASS_NS(iscsi_connection_class, struct iscsi_net { struct sock *nls; + spinlock_t sesslock; + struct list_head sesslist; + spinlock_t connlock; + struct list_head connlist; + struct list_head connlist_err; }; static int iscsi_net_id __read_mostly; static DEFINE_MUTEX(rx_queue_mutex); -static LIST_HEAD(sesslist); -static DEFINE_SPINLOCK(sesslock); -static LIST_HEAD(connlist); -static LIST_HEAD(connlist_err); -static DEFINE_SPINLOCK(connlock); - static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) { struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); @@ -1759,19 +1758,18 @@ static struct iscsi_cls_session *iscsi_session_lookup(struct net *net, { unsigned long flags; struct iscsi_cls_session *sess; - struct net *ns; + struct iscsi_net *isn; - spin_lock_irqsave(&sesslock, flags); - list_for_each_entry(sess, &sesslist, sess_list) { + isn = net_generic(net, iscsi_net_id); + + spin_lock_irqsave(&isn->sesslock, flags); + list_for_each_entry(sess, &isn->sesslist, sess_list) { if (sess->sid == sid) { - ns = iscsi_sess_net(sess); - if (ns != net) - continue; - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); return sess; } } - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); return NULL; } @@ -1783,19 +1781,18 @@ static struct iscsi_cls_conn *iscsi_conn_lookup(struct net *net, uint32_t sid, { unsigned long flags; struct iscsi_cls_conn *conn; - struct net *ns; + struct iscsi_net *isn; - spin_lock_irqsave(&connlock, flags); - list_for_each_entry(conn, &connlist, conn_list) { + isn = net_generic(net, iscsi_net_id); + + spin_lock_irqsave(&isn->connlock, flags); + list_for_each_entry(conn, &isn->connlist, conn_list) { if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { - ns = iscsi_conn_net(conn); - if (ns != net) - continue; - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return conn; } } - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return NULL; } @@ -2207,6 +2204,9 @@ EXPORT_SYMBOL_GPL(iscsi_alloc_session); int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) { struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_cls_host *ihost = shost->shost_data; + struct net *net = iscsi_host_net(ihost); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; int id = 0; int err; @@ -2250,9 +2250,9 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) goto release_dev; } - spin_lock_irqsave(&sesslock, flags); - list_add(&session->sess_list, &sesslist); - spin_unlock_irqrestore(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); + list_add(&session->sess_list, &isn->sesslist); + spin_unlock_irqrestore(&isn->sesslock, flags); iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n"); @@ -2322,15 +2322,17 @@ static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) void iscsi_remove_session(struct iscsi_cls_session *session) { + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; int err; ISCSI_DBG_TRANS_SESSION(session, "Removing session\n"); - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); if (!list_empty(&session->sess_list)) list_del(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); if (!cancel_work_sync(&session->block_work)) cancel_delayed_work_sync(&session->recovery_work); @@ -2541,20 +2543,22 @@ static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data) void iscsi_force_destroy_session(struct iscsi_cls_session *session) { struct iscsi_transport *transport = session->transport; + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; WARN_ON_ONCE(system_state == SYSTEM_RUNNING); - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); if (list_empty(&session->sess_list)) { - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); /* * Conn/ep is already freed. Session is being torn down via * async path. For shutdown we don't care about it so return. */ return; } - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); device_for_each_child(&session->dev, NULL, iscsi_iter_force_destroy_conn_fn); @@ -2625,6 +2629,8 @@ int iscsi_add_conn(struct iscsi_cls_conn *conn) int err; unsigned long flags; struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent); + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); err = device_add(&conn->dev); if (err) { @@ -2640,9 +2646,9 @@ int iscsi_add_conn(struct iscsi_cls_conn *conn) return err; } - spin_lock_irqsave(&connlock, flags); - list_add(&conn->conn_list, &connlist); - spin_unlock_irqrestore(&connlock, flags); + spin_lock_irqsave(&isn->connlock, flags); + list_add(&conn->conn_list, &isn->connlist); + spin_unlock_irqrestore(&isn->connlock, flags); return 0; } @@ -2657,11 +2663,14 @@ EXPORT_SYMBOL_GPL(iscsi_add_conn); */ void iscsi_remove_conn(struct iscsi_cls_conn *conn) { + struct net *net = iscsi_conn_net(conn); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); + unsigned long flags; - spin_lock_irqsave(&connlock, flags); + spin_lock_irqsave(&isn->connlock, flags); list_del(&conn->conn_list); - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); transport_unregister_device(&conn->dev); device_del(&conn->dev); @@ -3432,20 +3441,21 @@ iscsi_set_path(struct net *net, struct iscsi_transport *transport, return err; } -static int iscsi_session_has_conns(int sid) +static int iscsi_session_has_conns(struct net *net, int sid) { + struct iscsi_net *isn = net_generic(net, iscsi_net_id); struct iscsi_cls_conn *conn; unsigned long flags; int found = 0; - spin_lock_irqsave(&connlock, flags); - list_for_each_entry(conn, &connlist, conn_list) { + spin_lock_irqsave(&isn->connlock, flags); + list_for_each_entry(conn, &isn->connlist, conn_list) { if (iscsi_conn_get_sid(conn) == sid) { found = 1; break; } } - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return found; } @@ -4157,7 +4167,7 @@ iscsi_if_recv_msg(struct net *net, struct sk_buff *skb, session = iscsi_session_lookup(net, ev->u.d_session.sid); if (!session) err = -EINVAL; - else if (iscsi_session_has_conns(ev->u.d_session.sid)) + else if (iscsi_session_has_conns(net, ev->u.d_session.sid)) err = -EBUSY; else transport->destroy_session(session); @@ -4166,15 +4176,16 @@ iscsi_if_recv_msg(struct net *net, struct sk_buff *skb, session = iscsi_session_lookup(net, ev->u.d_session.sid); if (!session) err = -EINVAL; - else if (iscsi_session_has_conns(ev->u.d_session.sid)) + else if (iscsi_session_has_conns(net, ev->u.d_session.sid)) err = -EBUSY; else { + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; /* Prevent this session from being found again */ - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); list_del_init(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); queue_work(system_unbound_wq, &session->destroy_work); } @@ -5176,6 +5187,13 @@ static int __net_init iscsi_net_init(struct net *net) if (!nls) return -ENOMEM; isn = net_generic(net, iscsi_net_id); + + INIT_LIST_HEAD(&isn->sesslist); + spin_lock_init(&isn->sesslock); + INIT_LIST_HEAD(&isn->connlist); + INIT_LIST_HEAD(&isn->connlist_err); + spin_lock_init(&isn->connlock); + isn->nls = nls; return 0; } From patchwork Mon Apr 10 19:10:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Leech X-Patchwork-Id: 13206661 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 184DEC77B6F for ; Mon, 10 Apr 2023 19:12:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229744AbjDJTMO (ORCPT ); Mon, 10 Apr 2023 15:12:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229741AbjDJTMK (ORCPT ); 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Mon, 10 Apr 2023 15:11:13 -0400 X-MC-Unique: g0sfIhgJOKebvqPo2cb-6w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9B7DD185A78B; Mon, 10 Apr 2023 19:11:12 +0000 (UTC) Received: from localhost.redhat.com (unknown [10.2.16.6]) by smtp.corp.redhat.com (Postfix) with ESMTP id F2BED40C20FA; Mon, 10 Apr 2023 19:11:11 +0000 (UTC) From: Chris Leech To: linux-scsi@vger.kernel.org, open-iscsi@googlegroups.com, Hannes Reinecke , Lee Duncan , netdev@vger.kernel.org Cc: Chris Leech Subject: [PATCH 11/11] iscsi: force destroy sesions when a network namespace exits Date: Mon, 10 Apr 2023 12:10:33 -0700 Message-Id: <20230410191033.1069293-3-cleech@redhat.com> In-Reply-To: <83de4002-6846-2f90-7848-ef477f0b0fe5@suse.de> References: <83de4002-6846-2f90-7848-ef477f0b0fe5@suse.de> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The namespace is gone, so there is no userspace to clean up. Force close all the sessions. This should be enough for software transports, there's no implementation of migrating physical iSCSI hosts between network namespaces currently. Signed-off-by: Chris Leech Reviewed-by: Hannes Reinecke --- drivers/scsi/scsi_transport_iscsi.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 3a068d8eca2d..8fafa8f0e0df 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -5200,9 +5200,27 @@ static int __net_init iscsi_net_init(struct net *net) static void __net_exit iscsi_net_exit(struct net *net) { + struct iscsi_cls_session *session, *tmp; + struct iscsi_transport *transport; struct iscsi_net *isn; + unsigned long flags; + LIST_HEAD(sessions); isn = net_generic(net, iscsi_net_id); + + /* force session destruction, there is no userspace anymore */ + spin_lock_irqsave(&isn->sesslock, flags); + list_for_each_entry_safe(session, tmp, &isn->sesslist, sess_list) { + list_move_tail(&session->sess_list, &sessions); + } + spin_unlock_irqrestore(&isn->sesslock, flags); + list_for_each_entry_safe(session, tmp, &sessions, sess_list) { + device_for_each_child(&session->dev, NULL, + iscsi_iter_force_destroy_conn_fn); + transport = session->transport; + transport->destroy_session(session); + } + netlink_kernel_release(isn->nls); isn->nls = NULL; }