From mboxrd@z Thu Jan 1 00:00:00 1970 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 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.lore.kernel.org (Postfix) with ESMTPS id 4F71FC433F5 for ; Wed, 20 Apr 2022 09:28:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dOEB42yd5Z5Usk+ssmLsNw3rzqziiIYI6EYTF/teq6A=; b=3QcNMy/rVGG9eE71lP7VNSA6pd jzpvgSnIf67ZMjAbYwfI1mAxNmLrD9uTI78kEPNwa/HAyMymMvw19Kb3TU0jo3fZGH2FmCeWeI3mQ yJ84kPMQJa1AH7OJ2hMjwYV9lrpWkj3DXdjnqBhoVoIBaDJdtR/rmlna/it8qRbKKMzqp1uO1nP4P 6pU9MuBf7a593EKh8CGbhf9dIw6EJgUjjaUg2CAIOa9qZAwkv3Hb9GU7ulX556iiWR5Tq8CeVTyBu k06c6QA4F6qHE4IRkuVaj/wdmEhdctM2ibvQglm7LZQSz2UyRIeAWVJnGMb290HiYZ9MA/qyVstLK CFeDgC2Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nh6cs-008KQ9-HZ; Wed, 20 Apr 2022 09:27:54 +0000 Received: from smtp-out2.suse.de ([195.135.220.29]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nh6ch-008KJy-Dd for linux-nvme@lists.infradead.org; Wed, 20 Apr 2022 09:27:45 +0000 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 93DE91F74F; Wed, 20 Apr 2022 09:27:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1650446858; h=from:from:reply-to: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=dOEB42yd5Z5Usk+ssmLsNw3rzqziiIYI6EYTF/teq6A=; b=My2F23pCi6yDRELXP6tVQue6tJXE7XoE8v0rs4MrozPQPh5MQpJTlW0Z1irZLGXNpmkQDQ R01U7zR2vQiTebyasSREHcQ443Upwrtl6yjE+guVoTgwQuNJQCuwMwMznC9C5ysUkcyb5+ ktahEn2X2flBPiW5qZ9HMDqys4s+KI4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1650446858; h=from:from:reply-to: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=dOEB42yd5Z5Usk+ssmLsNw3rzqziiIYI6EYTF/teq6A=; b=iUcJabm9IzXmFg6diHT2c6qPMGuYVpzcYy7XrvOma1XM2jDi3Lr3VVlo7GOo68DHCGc6UM E5xjaToUORjSoBBA== Received: from adalid.arch.suse.de (adalid.arch.suse.de [10.161.8.13]) by relay2.suse.de (Postfix) with ESMTP id 8ABDB2C14E; Wed, 20 Apr 2022 09:27:38 +0000 (UTC) Received: by adalid.arch.suse.de (Postfix, from userid 16045) id 7B5015193E7E; Wed, 20 Apr 2022 11:27:38 +0200 (CEST) From: Hannes Reinecke To: Sagi Grimberg Cc: Christoph Hellwig , Keith Busch , linux-nvme@lists.infradead.org, Hannes Reinecke Subject: [PATCH 2/4] nvmet: per-port discovery subsystem Date: Wed, 20 Apr 2022 11:27:28 +0200 Message-Id: <20220420092730.35101-3-hare@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220420092730.35101-1-hare@suse.de> References: <20220420092730.35101-1-hare@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220420_022743_646260_1E083DCF X-CRM114-Status: GOOD ( 19.06 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Add a 'disc_subsys' pointer to each port to specify which discovery subsystem to use. The pointer is set when a discovery subsystem is linked into a port, and reset if that link is removed. Signed-off-by: Hannes Reinecke --- drivers/nvme/target/configfs.c | 10 +++++++++ drivers/nvme/target/core.c | 15 ++++++++++--- drivers/nvme/target/discovery.c | 39 ++++++++++++++++++++++----------- drivers/nvme/target/nvmet.h | 1 + 4 files changed, 49 insertions(+), 16 deletions(-) diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c index 38b0ab9fb721..44573fe0dfe4 100644 --- a/drivers/nvme/target/configfs.c +++ b/drivers/nvme/target/configfs.c @@ -821,6 +821,12 @@ static int nvmet_port_subsys_allow_link(struct config_item *parent, link->subsys = subsys; down_write(&nvmet_config_sem); + if (subsys->type == NVME_NQN_CURR && + port->disc_subsys) { + pr_err("discovery subsystem already present\n"); + ret = -EAGAIN; + goto out_free_link; + } ret = -EEXIST; list_for_each_entry(p, &port->subsystems, entry) { if (p->subsys == subsys) @@ -835,6 +841,8 @@ static int nvmet_port_subsys_allow_link(struct config_item *parent, list_add_tail(&link->entry, &port->subsystems); subsys->port_count++; + if (subsys->type == NVME_NQN_CURR) + port->disc_subsys = subsys; nvmet_port_disc_changed(port, subsys); up_write(&nvmet_config_sem); @@ -866,6 +874,8 @@ static void nvmet_port_subsys_drop_link(struct config_item *parent, subsys->port_count--; nvmet_port_del_ctrls(port, subsys); nvmet_port_disc_changed(port, subsys); + if (port->disc_subsys == subsys) + port->disc_subsys = NULL; if (list_empty(&port->subsystems)) nvmet_disable_port(port); diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 90e75324dae0..afd80999a335 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -1495,10 +1495,19 @@ static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, if (!port) return NULL; + /* + * As per spec discovery subsystems with a unique NQN + * have to respond to both NQNs, the unique NQN and the + * standard discovery NQN. + */ if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) { - if (!kref_get_unless_zero(&nvmet_disc_subsys->ref)) - return NULL; - return nvmet_disc_subsys; + struct nvmet_subsys *disc_subsys; + + disc_subsys = port->disc_subsys ? + port->disc_subsys : nvmet_disc_subsys; + if (!kref_get_unless_zero(&disc_subsys->ref)) + return NULL; + return disc_subsys; } down_read(&nvmet_config_sem); diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c index b5012df790d5..6b8aa6c4e752 100644 --- a/drivers/nvme/target/discovery.c +++ b/drivers/nvme/target/discovery.c @@ -29,18 +29,22 @@ void nvmet_port_disc_changed(struct nvmet_port *port, struct nvmet_subsys *subsys) { struct nvmet_ctrl *ctrl; + struct nvmet_subsys *disc_subsys; lockdep_assert_held(&nvmet_config_sem); nvmet_genctr++; - mutex_lock(&nvmet_disc_subsys->lock); - list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) { + disc_subsys = port->disc_subsys ? + port->disc_subsys : nvmet_disc_subsys; + + mutex_lock(&disc_subsys->lock); + list_for_each_entry(ctrl, &disc_subsys->ctrls, subsys_entry) { if (subsys && !nvmet_host_allowed(subsys, ctrl->hostnqn)) continue; __nvmet_disc_changed(port, ctrl); } - mutex_unlock(&nvmet_disc_subsys->lock); + mutex_unlock(&disc_subsys->lock); /* If transport can signal change, notify transport */ if (port->tr_ops && port->tr_ops->discovery_chg) @@ -48,19 +52,23 @@ void nvmet_port_disc_changed(struct nvmet_port *port, } static void __nvmet_subsys_disc_changed(struct nvmet_port *port, - struct nvmet_subsys *subsys, struct nvmet_host *host) { struct nvmet_ctrl *ctrl; + struct nvmet_subsys *disc_subsys; + + disc_subsys = port->disc_subsys ? + port->disc_subsys : nvmet_disc_subsys; - mutex_lock(&nvmet_disc_subsys->lock); - list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) { + mutex_lock(&disc_subsys->lock); + + list_for_each_entry(ctrl, &disc_subsys->ctrls, subsys_entry) { if (host && strcmp(nvmet_host_name(host), ctrl->hostnqn)) continue; __nvmet_disc_changed(port, ctrl); } - mutex_unlock(&nvmet_disc_subsys->lock); + mutex_unlock(&disc_subsys->lock); } void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, @@ -76,7 +84,7 @@ void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, list_for_each_entry(s, &port->subsystems, entry) { if (s->subsys != subsys) continue; - __nvmet_subsys_disc_changed(port, subsys, host); + __nvmet_subsys_disc_changed(port, host); } } @@ -146,7 +154,10 @@ static size_t discovery_log_entries(struct nvmet_req *req) struct nvmet_ctrl *ctrl = req->sq->ctrl; struct nvmet_subsys_link *p; struct nvmet_port *r; - size_t entries = 1; + size_t entries = 0; + + if (!req->port->disc_subsys) + entries++; list_for_each_entry(p, &req->port->subsystems, entry) { if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn)) @@ -208,10 +219,12 @@ static void nvmet_execute_disc_get_log_page(struct nvmet_req *req) nvmet_set_disc_traddr(req, req->port, traddr); - nvmet_format_discovery_entry(hdr, req->port, - nvmet_disc_subsys->subsysnqn, - traddr, NVME_NQN_CURR, numrec); - numrec++; + if (!req->port->disc_subsys) { + nvmet_format_discovery_entry(hdr, req->port, + nvmet_disc_subsys->subsysnqn, + traddr, NVME_NQN_CURR, numrec); + numrec++; + } list_for_each_entry(p, &req->port->subsystems, entry) { if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn)) diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index ecba3890ce65..8df297a190bf 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -144,6 +144,7 @@ struct nvmet_port { struct list_head global_entry; struct config_group ana_groups_group; struct nvmet_ana_group ana_default_group; + struct nvmet_subsys *disc_subsys; enum nvme_ana_state *ana_state; void *priv; bool enabled; -- 2.29.2