tres v0.1.0 Openflow.Action.NxRegLoad
Copies value[0:n_bits] to dst[ofs:ofs+n_bits], where a[b:c] denotes the bits within 'a' numbered 'b' through 'c' (not including bit 'c'). Bit numbering starts at 0 for the least-significant bit, 1 for the next most significant bit, and so on.
'dst' is an nxm_header with nxm_hasmask=0. See the documentation for NXAST_REG_MOVE, above, for the permitted fields and for the side effects of loading them.
The 'ofs' and 'n_bits' fields are combined into a single 'ofs_nbits' field to avoid enlarging the structure by another 8 bytes. To allow 'n_bits' to take a value between 1 and 64 (inclusive) while taking up only 6 bits, it is also stored as one less than its true value:
15 6 5 0
+------------------------------+------------------+
| ofs | n_bits - 1 |
+------------------------------+------------------+
The switch will reject actions for which ofs+n_bits is greater than the width of 'dst', or in which any bits in 'value' with value 2n_bits or greater are set to 1, with error type OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT.