RECEIVE_BUFFER_SIZE is not enough

[caowangbao]

When there are 252 VF, the size of IFLA_VFINFO_LIST will reach 65524 (252*260+4). In addition, when considering other fields such as IFLA_STATS64, IFLA_STATS, IFLA_AF_SPEC, etc., nlmsg_len can easily exceed 65535.

Meanwhile, in a kernel submission (torvalds/linux@75345f8), the BROADCAST field was added to VF, making the size of a single VF reach 296. With this change, when there are 222 VF, the size of IFLA_VFINFO_LIST will reach 65716.

Therefore, RECEIVE_BUFFER_SIZE=65535 is not enough.