On Thu, Oct 18, 2018 at 08:45:15PM +0800, 张萌 wrote:
> Hi, guys:
>
> I got stuck in Nicira extension actions when developing my own
> openflow controller.
>
> When I marsh the stack_push action, the ovs snooper tells “|zero bit source
> field ipv6_dst” as the following picture.
>
>
>
>
>
> is there anywhere i can find a dev doc of Nicira extension in ovs ?
The main documentation is in lib/ofp-actions.c. It's pretty simple
really:
/* Action structure for NXAST_STACK_PUSH and NXAST_STACK_POP.
*
* Pushes (or pops) field[offset: offset + n_bits] to (or from)
* top of the stack.
*/
struct nx_action_stack {
ovs_be16 type; /* OFPAT_VENDOR. */
ovs_be16 len; /* Length is 16. */
ovs_be32 vendor; /* NX_VENDOR_ID. */
ovs_be16 subtype; /* NXAST_STACK_PUSH or NXAST_STACK_POP. */
ovs_be16 offset; /* Bit offset into the field. */
/* Followed by:
* - OXM/NXM header for field to push or pop (4 or 8 bytes).
* - ovs_be16 'n_bits', the number of bits to extract from the field.
* - Enough 0-bytes to pad out the action to 24 bytes. */
uint8_t pad[12]; /* See above. */
};
OFP_ASSERT(sizeof(struct nx_action_stack) == 24);
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