V_sphash_mask
#define SPHASH_HASHVAL(id) (key_u32hash(id) & V_sphash_mask)
V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
for (i = 0; i < V_sphash_mask + 1; i++)
hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);