nvme: enable uring-passthrough for admin commands

Add two new opcodes that userspace can use for admin commands:
NVME_URING_CMD_ADMIN : non-vectroed
NVME_URING_CMD_ADMIN_VEC : vectored variant

Wire up support when these are issued on controller node(/dev/nvmeX).

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220520090630.70394-3-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 682df98..1a98404 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3146,6 +3146,7 @@ static const struct file_operations nvme_dev_fops = {
        .release        = nvme_dev_release,
        .unlocked_ioctl = nvme_dev_ioctl,
        .compat_ioctl   = compat_ptr_ioctl,
+       .uring_cmd      = nvme_dev_uring_cmd,
 };
 
 static ssize_t nvme_sysfs_reset(struct device *dev,

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 114b490..096b1b4 100644 (file)
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -686,6 +686,29 @@ int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 }
 #endif /* CONFIG_NVME_MULTIPATH */
 
+int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
+{
+       struct nvme_ctrl *ctrl = ioucmd->file->private_data;
+       int ret;
+
+       ret = nvme_uring_cmd_checks(issue_flags);
+       if (ret)
+               return ret;
+
+       switch (ioucmd->cmd_op) {
+       case NVME_URING_CMD_ADMIN:
+               ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false);
+               break;
+       case NVME_URING_CMD_ADMIN_VEC:
+               ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true);
+               break;
+       default:
+               ret = -ENOTTY;
+       }
+
+       return ret;
+}
+
 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
 {
        struct nvme_ns *ns;

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 086ccbd..26d35c5 100644 (file)
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -787,6 +787,7 @@ int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
                unsigned int issue_flags);
 int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo);
+int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
 
 extern const struct attribute_group *nvme_ns_id_attr_groups[];
 extern const struct pr_ops nvme_pr_ops;

diff --git a/include/uapi/linux/nvme_ioctl.h b/include/uapi/linux/nvme_ioctl.h
index 0b1876a..2f76cba 100644 (file)
--- a/include/uapi/linux/nvme_ioctl.h
+++ b/include/uapi/linux/nvme_ioctl.h
@@ -108,5 +108,7 @@ struct nvme_uring_cmd {
 /* io_uring async commands: */
 #define NVME_URING_CMD_IO      _IOWR('N', 0x80, struct nvme_uring_cmd)
 #define NVME_URING_CMD_IO_VEC  _IOWR('N', 0x81, struct nvme_uring_cmd)
+#define NVME_URING_CMD_ADMIN   _IOWR('N', 0x82, struct nvme_uring_cmd)
+#define NVME_URING_CMD_ADMIN_VEC _IOWR('N', 0x83, struct nvme_uring_cmd)
 
 #endif /* _UAPI_LINUX_NVME_IOCTL_H */