From: Logan Gunthorpe <logang@deltatee.com> To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>, Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>, Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>, Max Gurtovoy <maxg@mellanox.com>, Stephen Bates <sbates@raithlin.com>, Logan Gunthorpe <logang@deltatee.com>, Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Subject: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl Date: Thu, 1 Aug 2019 17:45:07 -0600 Message-ID: <20190801234514.7941-9-logang@deltatee.com> (raw) In-Reply-To: <20190801234514.7941-1-logang@deltatee.com> This patch rejects any new connection to the passthru-ctrl if this controller is already connected to a different host. At the time of allocating the controller we check if the subsys associated with the passthru ctrl is already connected to a host and reject it if the hostnqn differs. Connections from the same host (by hostnqn) are supported to allow for multipath. [chaitanya.kulkarni@wdc.com: based conceptually on a similar patch but different implementation] Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/nvme/target/core.c | 4 ++++ drivers/nvme/target/io-cmd-passthru.c | 31 +++++++++++++++++++++++++++ drivers/nvme/target/nvmet.h | 7 ++++++ 3 files changed, 42 insertions(+) diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 2e75968af7f4..c655f26db3da 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -1278,6 +1278,10 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, if (!ctrl->sqs) goto out_free_cqs; + ret = nvmet_passthru_alloc_ctrl(subsys, hostnqn); + if (ret) + goto out_free_sqs; + ret = ida_simple_get(&cntlid_ida, NVME_CNTLID_MIN, NVME_CNTLID_MAX, GFP_KERNEL); diff --git a/drivers/nvme/target/io-cmd-passthru.c b/drivers/nvme/target/io-cmd-passthru.c index b199785500ad..06a919283cc5 100644 --- a/drivers/nvme/target/io-cmd-passthru.c +++ b/drivers/nvme/target/io-cmd-passthru.c @@ -104,6 +104,37 @@ void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) mutex_unlock(&subsys->lock); } +int nvmet_passthru_alloc_ctrl(struct nvmet_subsys *subsys, + const char *hostnqn) +{ + struct nvmet_ctrl *ctrl; + + /* + * Check here if this subsystem is already connected to the passthru + * ctrl. We allow only one host to connect to a given passthru + * subsystem. + */ + int rc = 0; + + mutex_lock(&subsys->lock); + + if (!subsys->passthru_ctrl) + goto out; + + if (list_empty(&subsys->ctrls)) + goto out; + + ctrl = list_first_entry(&subsys->ctrls, struct nvmet_ctrl, + subsys_entry); + + if (strcmp(hostnqn, ctrl->hostnqn)) + rc = -ENODEV; + +out: + mutex_unlock(&subsys->lock); + return rc; +} + static void nvmet_passthru_req_complete(struct nvmet_req *req, struct request *rq, u16 status) { diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index aff4db03269d..6436cb990905 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -513,6 +513,8 @@ void nvmet_passthru_destroy(void); void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys); int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys); void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys); +int nvmet_passthru_alloc_ctrl(struct nvmet_subsys *subsys, + const char *hostnqn); u16 nvmet_parse_passthru_cmd(struct nvmet_req *req); static inline @@ -536,6 +538,11 @@ static inline void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) static inline void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) { } +static inline int nvmet_passthru_alloc_ctrl(struct nvmet_subsys *subsys, + const char *hostnqn) +{ + return 0; +} static inline u16 nvmet_parse_passthru_cmd(struct nvmet_req *req) { return 0; -- 2.20.1
next prev parent reply index Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-01 23:44 [PATCH v7 00/14] nvmet: add target passthru commands support Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 01/14] nvme-core: introduce nvme_ctrl_get_by_path() Logan Gunthorpe 2019-08-14 14:20 ` Max Gurtovoy 2019-08-15 11:46 ` Max Gurtovoy 2019-08-15 15:59 ` Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 02/14] nvme-core: export existing ctrl and ns interfaces Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 03/14] nvmet: add return value to nvmet_add_async_event() Logan Gunthorpe 2019-08-14 14:26 ` Max Gurtovoy 2019-08-14 16:59 ` Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 04/14] nvmet: make nvmet_copy_ns_identifier() non-static Logan Gunthorpe 2019-08-14 14:29 ` Max Gurtovoy 2019-08-15 7:15 ` Chaitanya Kulkarni 2019-08-01 23:45 ` [PATCH v7 05/14] nvmet-passthru: update KConfig with config passthru option Logan Gunthorpe 2019-08-14 14:31 ` Max Gurtovoy 2019-08-01 23:45 ` [PATCH v7 06/14] nvmet-passthru: add passthru code to process commands Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 07/14] nvmet-passthru: add enable/disable helpers Logan Gunthorpe 2019-08-15 12:20 ` Max Gurtovoy 2019-08-15 16:02 ` Logan Gunthorpe 2019-08-01 23:45 ` Logan Gunthorpe [this message] 2019-08-15 12:36 ` [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl Max Gurtovoy 2019-08-15 16:06 ` Logan Gunthorpe 2019-08-18 10:33 ` Max Gurtovoy 2019-08-22 0:09 ` Sagi Grimberg 2019-08-22 8:50 ` Max Gurtovoy 2019-08-22 17:41 ` Sagi Grimberg 2019-08-22 19:17 ` Sagi Grimberg 2019-08-22 19:41 ` Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 09/14] nvmet-core: don't check the data len for pt-ctrl Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 10/14] nvmet-tcp: don't check data_len in nvmet_tcp_map_data() Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 11/14] nvmet-configfs: introduce passthru configfs interface Logan Gunthorpe 2019-08-15 12:46 ` Max Gurtovoy 2019-08-01 23:45 ` [PATCH v7 12/14] block: don't check blk_rq_is_passthrough() in blk_do_io_stat() Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 13/14] block: call blk_account_io_start() in blk_execute_rq_nowait() Logan Gunthorpe 2019-08-01 23:45 ` [PATCH v7 14/14] nvmet-passthru: support block accounting Logan Gunthorpe
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