Add bare minimum structures and helper functions required for
io_uring passthrough commands. This will enable the follow up
patch to add tests for nvme-ns generic character device.
Signed-off-by: Ankit Kumar <ankit.kumar@xxxxxxxxxxx>
---
test/nvme.h | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 168 insertions(+)
create mode 100644 test/nvme.h
diff --git a/test/nvme.h b/test/nvme.h
new file mode 100644
index 0000000..14dc338
--- /dev/null
+++ b/test/nvme.h
@@ -0,0 +1,168 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: Helpers for NVMe uring passthrough commands
+ */
+#ifndef LIBURING_NVME_H
+#define LIBURING_NVME_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/ioctl.h>
+#include <linux/nvme_ioctl.h>
+
+/*
+ * If the uapi headers installed on the system lacks nvme uring command
+ * support, use the local version to prevent compilation issues.
+ */
+#ifndef CONFIG_HAVE_NVME_URING
+struct nvme_uring_cmd {
+ __u8 opcode;
+ __u8 flags;
+ __u16 rsvd1;
+ __u32 nsid;
+ __u32 cdw2;
+ __u32 cdw3;
+ __u64 metadata;
+ __u64 addr;
+ __u32 metadata_len;
+ __u32 data_len;
+ __u32 cdw10;
+ __u32 cdw11;
+ __u32 cdw12;
+ __u32 cdw13;
+ __u32 cdw14;
+ __u32 cdw15;
+ __u32 timeout_ms;
+ __u32 rsvd2;
+};
+
+#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)
+#endif /* CONFIG_HAVE_NVME_URING */
+
+#define NVME_DEFAULT_IOCTL_TIMEOUT 0
+#define NVME_IDENTIFY_DATA_SIZE 4096
+#define NVME_IDENTIFY_CSI_SHIFT 24
+#define NVME_IDENTIFY_CNS_NS 0
+#define NVME_CSI_NVM 0
+
+enum nvme_admin_opcode {
+ nvme_admin_identify = 0x06,
+};
+
+enum nvme_io_opcode {
+ nvme_cmd_write = 0x01,
+ nvme_cmd_read = 0x02,
+};
+
+int nsid;
+__u32 lba_shift;
+
+struct nvme_lbaf {
+ __le16 ms;
+ __u8 ds;
+ __u8 rp;
+};
+
+struct nvme_id_ns {
+ __le64 nsze;
+ __le64 ncap;
+ __le64 nuse;
+ __u8 nsfeat;
+ __u8 nlbaf;
+ __u8 flbas;
+ __u8 mc;
+ __u8 dpc;
+ __u8 dps;
+ __u8 nmic;
+ __u8 rescap;
+ __u8 fpi;
+ __u8 dlfeat;
+ __le16 nawun;
+ __le16 nawupf;
+ __le16 nacwu;
+ __le16 nabsn;
+ __le16 nabo;
+ __le16 nabspf;
+ __le16 noiob;
+ __u8 nvmcap[16];
+ __le16 npwg;
+ __le16 npwa;
+ __le16 npdg;
+ __le16 npda;
+ __le16 nows;
+ __le16 mssrl;
+ __le32 mcl;
+ __u8 msrc;
+ __u8 rsvd81[11];
+ __le32 anagrpid;
+ __u8 rsvd96[3];
+ __u8 nsattr;
+ __le16 nvmsetid;
+ __le16 endgid;
+ __u8 nguid[16];
+ __u8 eui64[8];
+ struct nvme_lbaf lbaf[16];
+ __u8 rsvd192[192];
+ __u8 vs[3712];
+};
+
+static inline int ilog2(uint32_t i)
+{
+ int log = -1;
+
+ while (i) {
+ i >>= 1;
+ log++;
+ }
+ return log;
+}
+
+int nvme_get_info(const char *file)
+{
+ struct nvme_id_ns ns;
+ int fd, err;
+ __u32 lba_size;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ perror("file open");
+ return -errno;
+ }
+
+ nsid = ioctl(fd, NVME_IOCTL_ID);
+ if (nsid < 0) {
+ close(fd);
+ return -errno;
+ }
+
+ struct nvme_passthru_cmd cmd = {
+ .opcode = nvme_admin_identify,
+ .nsid = nsid,
+ .addr = (__u64)(uintptr_t)&ns,
+ .data_len = NVME_IDENTIFY_DATA_SIZE,
+ .cdw10 = NVME_IDENTIFY_CNS_NS,
+ .cdw11 = NVME_CSI_NVM << NVME_IDENTIFY_CSI_SHIFT,
+ .timeout_ms = NVME_DEFAULT_IOCTL_TIMEOUT,
+ };
+
+ err = ioctl(fd, NVME_IOCTL_ADMIN_CMD, &cmd);
+ if (err) {
+ close(fd);
+ return err;
+ }
+
+ lba_size = 1 << ns.lbaf[(ns.flbas & 0x0f)].ds;
+ lba_shift = ilog2(lba_size);
+
+ close(fd);
+ return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
2.17.1
