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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>,
	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
	Logan Gunthorpe <logang@deltatee.com>
Subject: [PATCH v7 09/14] nvmet-core: don't check the data len for pt-ctrl
Date: Thu,  1 Aug 2019 17:45:08 -0600
Message-ID: <20190801234514.7941-10-logang@deltatee.com> (raw)
In-Reply-To: <20190801234514.7941-1-logang@deltatee.com>

From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>

Right now, data_len is calculated before the transfer len after we
parse the command, With passthru interface we allow VUCs (Vendor-Unique
Commands). In order to make the code simple and compact, instead of
assigning the data len or each VUC in the command parse function
just use the transfer len as it is. This may result in error if expected
data_len != transfer_len.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[logang@deltatee.com:
   * added definition of VUC to the commit message and comment
   * use nvmet_req_passthru_ctrl() helper seeing we can't dereference
     subsys->passthru_ctrl if CONFIG_NVME_TARGET_PASSTHRU is not set]
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
 drivers/nvme/target/core.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index c655f26db3da..1cda94437fbf 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -941,7 +941,16 @@ EXPORT_SYMBOL_GPL(nvmet_req_uninit);
 
 void nvmet_req_execute(struct nvmet_req *req)
 {
-	if (unlikely(req->data_len != req->transfer_len)) {
+	/*
+	 * data_len is calculated before the transfer len after we parse
+	 * the command, With passthru interface we allow VUC (Vendor-Unique
+	 * Commands)'s. In order to make the code simple and compact,
+	 * instead of assinging the dala len for each VUC in the command
+	 * parse function just use the transfer len as it is. This may
+	 * result in error if expected data_len != transfer_len.
+	 */
+	if (!(req->sq->ctrl && nvmet_req_passthru_ctrl(req)) &&
+	    unlikely(req->data_len != req->transfer_len)) {
 		req->error_loc = offsetof(struct nvme_common_command, dptr);
 		nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
 	} else
-- 
2.20.1


  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 ` [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl Logan Gunthorpe
2019-08-15 12:36   ` 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 ` Logan Gunthorpe [this message]
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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