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charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220728093906epcas5p3fb607ddd16054ca7e6cbf26b53306062 References: <20220728093327.32580-1-ankit.kumar@samsung.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org 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 --- 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 +#include + +/* + * 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