svn commit: r365946 - head/sys/dev/nvme

[David Bright]

Author: dab
Date: Mon Sep 21 15:41:47 2020
New Revision: 365946
URL: https://svnweb.freebsd.org/changeset/base/365946

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

Modified:
  head/sys/dev/nvme/nvme.h
  head/sys/dev/nvme/nvme_ctrlr.c

Modified: head/sys/dev/nvme/nvme.h
==============================================================================
--- head/sys/dev/nvme/nvme.h	Mon Sep 21 15:24:44 2020	(r365945)
+++ head/sys/dev/nvme/nvme.h	Mon Sep 21 15:41:47 2020	(r365946)
@@ -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)

Modified: head/sys/dev/nvme/nvme_ctrlr.c
==============================================================================
--- head/sys/dev/nvme/nvme_ctrlr.c	Mon Sep 21 15:24:44 2020	(r365945)
+++ head/sys/dev/nvme/nvme_ctrlr.c	Mon Sep 21 15:41:47 2020	(r365946)
@@ -1345,6 +1345,9 @@ nvme_ctrlr_ioctl(struct cdev *cdev, u_long cmd, caddr_
 		gnsid->nsid = 0;
 		break;
 	}
+	case NVME_GET_MAX_XFER_SIZE:
+		*(uint64_t *)arg = ctrlr->max_xfer_size;
+		break;
 	default:
 		return (ENOTTY);
 	}