vpp: T9146: Enable DPDK no-multi-seg when a full frame fits the buffer

Disabling DPDK multi-segment buffers (no-multi-seg) lets VPP receive each
frame into a single buffer, increasing forwarding throughput. The frame
must then fit the buffer 'data-size', so 'no-multi-seg' is computed: it is
enabled only while the largest MTU across all VPP-bound interfaces, plus
its L2 framing overhead (26 bytes), fits 'data-size'. Otherwise VPP keeps
multi-seg and Jumbo frames still work without a larger buffer.

Changing the MTU of a VPP-bound interface can flip the flag, so
interfaces_ethernet reconfigures VPP when it changes, via an initial
dependency (set_dependents_initial) to avoid a cycle with the existing
vpp -> ethernet dependency.

0 files changed, 0 insertions, 0 deletions