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Add an ioctl to get an NVMe device's maximum transfer size

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Reviewed by:	imp, chuck
Obtained from:	Dell EMC Isilon
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D26390
This commit is contained in:
David Bright 2020-09-21 15:41:47 +00:00
parent cba446e2c2
commit e32d47f32d
2 changed files with 4 additions and 0 deletions
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1
sys/dev/nvme/nvme.h
View File

@ -41,6 +41,7 @@
#define NVME_PASSTHROUGH_CMD _IOWR('n', 0, struct nvme_pt_command)
#define NVME_RESET_CONTROLLER _IO('n', 1)
#define NVME_GET_NSID _IOR('n', 2, struct nvme_get_nsid)
#define NVME_GET_MAX_XFER_SIZE _IOR('n', 3, uint64_t)
#define NVME_IO_TEST _IOWR('n', 100, struct nvme_io_test)
#define NVME_BIO_TEST _IOWR('n', 101, struct nvme_io_test)

3
sys/dev/nvme/nvme_ctrlr.c
View File

@ -1345,6 +1345,9 @@ nvme_ctrlr_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int flag,
gnsid->nsid = 0;
break;
}
case NVME_GET_MAX_XFER_SIZE:
*(uint64_t *)arg = ctrlr->max_xfer_size;
break;
default:
return (ENOTTY);
}