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nvme: add vectored-io support for user-passthrough

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Add a new NVME_IOCTL_IO64_CMD_VEC ioctl that works like the existing
NVME_IOCTL_IO64_CMD ioctl except that it takes and array of iovecs
and thus supports vectored I/O.

  - cmd.addr is base address of user iovec array
  - cmd.vec_cnt is count of iovec array elements

This patch does not include vectored-variant for admin-commands as most
of them are light on buffers and likely to have low invocation frequency.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Kanchan Joshi
2022-02-10 11:07:55 +05:30
committed by Christoph Hellwig
parent bd83fe6f2c
commit 89377bc197
2 changed files with 31 additions and 10 deletions
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6
include/uapi/linux/nvme_ioctl.h
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@@ -55,7 +55,10 @@ struct nvme_passthru_cmd64 {
__u64 metadata;
__u64 addr;
__u32 metadata_len;
__u32 data_len;
union {
__u32 data_len; /* for non-vectored io */
__u32 vec_cnt; /* for vectored io */
};
__u32 cdw10;
__u32 cdw11;
__u32 cdw12;
@@ -78,5 +81,6 @@ struct nvme_passthru_cmd64 {
#define NVME_IOCTL_RESCAN _IO('N', 0x46)
#define NVME_IOCTL_ADMIN64_CMD _IOWR('N', 0x47, struct nvme_passthru_cmd64)
#define NVME_IOCTL_IO64_CMD _IOWR('N', 0x48, struct nvme_passthru_cmd64)
#define NVME_IOCTL_IO64_CMD_VEC _IOWR('N', 0x49, struct nvme_passthru_cmd64)
#endif /* _UAPI_LINUX_NVME_IOCTL_H */