em(4) receives jumbos by chaining its MCLBYTES sized descriptors together, so to receive a full 9000 byte frame, it needs 5 descriptors. its current mclgeti low watermark is 4.
em(4) receives jumbos by chaining its MCLBYTES sized descriptors
together, so to receive a full 9000 byte frame, it needs 5 descriptors.
its current mclgeti low watermark is 4.

it appears that the chip will block if it has rxed a packet into
its internal buffers waiting for descriptors. if you're at the lwm,
that means you're DoSed.

this raises the lwm so we can get at least two jumbos, ie, 10
descriptors.

ok deraadt@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars