D26390.id77297.diff
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	Index: head/sys/dev/nvme/nvme.h
	===================================================================
	--- head/sys/dev/nvme/nvme.h
	+++ head/sys/dev/nvme/nvme.h
	@@ -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)
	Index: head/sys/dev/nvme/nvme_ctrlr.c
	===================================================================
	--- head/sys/dev/nvme/nvme_ctrlr.c
	+++ head/sys/dev/nvme/nvme_ctrlr.c
	@@ -1345,6 +1345,9 @@
	gnsid->nsid = 0;
	break;
	}
	+ case NVME_GET_MAX_XFER_SIZE:
	+ (uint64_t )arg = ctrlr->max_xfer_size;
	+ break;
	default:
	return (ENOTTY);
	}