rds_info_counter
avail = len / sizeof(struct rds_info_counter);
lens->each = sizeof(struct rds_info_counter);
struct rds_info_counter ctr;
EXPECT_EQ(0, len % (socklen_t)sizeof(struct rds_info_counter));
struct rds_info_counter *ctr;
EXPECT_EQ(sizeof(struct rds_info_counter), ret);
ctr = (struct rds_info_counter *)buf;
char small[sizeof(struct rds_info_counter)];