This patch updates the SCIF header file and IOCTL interface with the changes required to support RMAs. APIs added include the ability to pin pages and register those pages with SCIF. SCIF kernel clients can also add references to remote registered pages and access them via the CPU. The user space IOCTL interface has been updated to enable SCIF registration, RDMA/CPU copies and fence APIs for RDMA synchronization.
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| @@ -106,6 +106,82 @@ struct scifioctl_msg { · 105 unmodified lines | ||
| 106 | 106 | __s32 out_len; |
| 107 | 107 | }; |
| 108 | 108 | |
| 109 | +/** | |
| 110 | + * struct scifioctl_reg - used for SCIF_REG IOCTL | |
| 111 | + * @addr: starting virtual address | |
| 112 | + * @len: length of range | |
| 113 | + * @offset: offset of window | |
| 114 | + * @prot: read/write protection | |
| 115 | + * @flags: flags | |
| 116 | + * @out_offset: offset returned | |
| 117 | + */ | |
| 118 | +struct scifioctl_reg { | |
| 119 | + __u64 addr; | |
| 120 | + __u64 len; | |
| 121 | + __s64 offset; | |
| 122 | + __s32 prot; | |
| 123 | + __s32 flags; | |
| 124 | + __s64 out_offset; | |
| 125 | +}; | |
| 126 | + | |
| 127 | +/** | |
| 128 | + * struct scifioctl_unreg - used for SCIF_UNREG IOCTL | |
| 129 | + * @offset: start of range to unregister | |
| 130 | + * @len: length of range to unregister | |
| 131 | + */ | |
| 132 | +struct scifioctl_unreg { | |
| 133 | + __s64 offset; | |
| 134 | + __u64 len; | |
| 135 | +}; | |
| 136 | + | |
| 137 | +/** | |
| 138 | + * struct scifioctl_copy - used for SCIF DMA copy IOCTLs | |
| 139 | + * | |
| 140 | + * @loffset: offset in local registered address space to/from | |
| 141 | + * which to copy | |
| 142 | + * @len: length of range to copy | |
| 143 | + * @roffset: offset in remote registered address space to/from | |
| 144 | + * which to copy | |
| 145 | + * @addr: user virtual address to/from which to copy | |
| 146 | + * @flags: flags | |
| 147 | + * | |
| 148 | + * This structure is used for SCIF_READFROM, SCIF_WRITETO, SCIF_VREADFROM | |
| 149 | + * and SCIF_VREADFROM IOCTL's. | |
| 150 | + */ | |
| 151 | +struct scifioctl_copy { | |
| 152 | + __s64 loffset; | |
| 153 | + __u64 len; | |
| 154 | + __s64 roffset; | |
| 155 | + __u64 addr; | |
| 156 | + __s32 flags; | |
| 157 | +}; | |
| 158 | + | |
| 159 | +/** | |
| 160 | + * struct scifioctl_fence_mark - used for SCIF_FENCE_MARK IOCTL | |
| 161 | + * @flags: flags | |
| 162 | + * @mark: fence handle which is a pointer to a __s32 | |
| 163 | + */ | |
| 164 | +struct scifioctl_fence_mark { | |
| 165 | + __s32 flags; | |
| 166 | + __u64 mark; | |
| 167 | +}; | |
| 168 | + | |
| 169 | +/** | |
| 170 | + * struct scifioctl_fence_signal - used for SCIF_FENCE_SIGNAL IOCTL | |
| 171 | + * @loff: local offset | |
| 172 | + * @lval: value to write to loffset | |
| 173 | + * @roff: remote offset | |
| 174 | + * @rval: value to write to roffset | |
| 175 | + * @flags: flags | |
| 176 | + */ | |
| 177 | +struct scifioctl_fence_signal { | |
| 178 | + __s64 loff; | |
| 179 | + __u64 lval; | |
| 180 | + __s64 roff; | |
| 181 | + __u64 rval; | |
| 182 | + __s32 flags; | |
| 183 | +}; | |
| 184 | + | |
| 109 | 185 | /** |
| 110 | 186 | * struct scifioctl_node_ids - used for SCIF_GET_NODEIDS IOCTL |
| 111 | 187 | * @nodes: pointer to an array of node_ids |
| @@ -125,6 +201,15 @@ struct scifioctl_node_ids { · 13 unmodified lines | ||
| 125 | 201 | #define SCIF_ACCEPTREG _IOWR('s', 5, __u64) |
| 126 | 202 | #define SCIF_SEND _IOWR('s', 6, struct scifioctl_msg) |
| 127 | 203 | #define SCIF_RECV _IOWR('s', 7, struct scifioctl_msg) |
| 204 | +#define SCIF_REG _IOWR('s', 8, struct scifioctl_reg) | |
| 205 | +#define SCIF_UNREG _IOWR('s', 9, struct scifioctl_unreg) | |
| 206 | +#define SCIF_READFROM _IOWR('s', 10, struct scifioctl_copy) | |
| 207 | +#define SCIF_WRITETO _IOWR('s', 11, struct scifioctl_copy) | |
| 208 | +#define SCIF_VREADFROM _IOWR('s', 12, struct scifioctl_copy) | |
| 209 | +#define SCIF_VWRITETO _IOWR('s', 13, struct scifioctl_copy) | |
| 128 | 210 | #define SCIF_GET_NODEIDS _IOWR('s', 14, struct scifioctl_node_ids) |
| 211 | +#define SCIF_FENCE_MARK _IOWR('s', 15, struct scifioctl_fence_mark) | |
| 212 | +#define SCIF_FENCE_WAIT _IOWR('s', 16, __s32) | |
| 213 | +#define SCIF_FENCE_SIGNAL _IOWR('s', 17, struct scifioctl_fence_signal) | |
| 129 | 214 | |
| 130 | 215 | #endif /* SCIF_IOCTL_H */ |