void *m_ext_get(struct vmm_mbuf *m, u32 size, enum vmm_mbuf_alloc_types how)
{
void *buf;
u32 slab;
struct mempool *mp = NULL;
if (VMM_MBUF_ALLOC_DMA == how) {
buf = vmm_dma_malloc(size);
if (!buf) {
return NULL;
}
m->m_flags |= M_EXT_DMA;
MEXTADD(m, buf, size, ext_dma_free, NULL);
} else {
for (slab = 0; slab < EPOOL_SLAB_COUNT; slab++) {
if (size <= epool_slab_buf_size(slab)) {
mp = mbpctrl.epool_slabs[slab];
break;
}
}
if (mp && (buf = mempool_malloc(mp))) {
m->m_flags |= M_EXT_POOL;
MEXTADD(m, buf, size, ext_pool_free, mp);
} else if ((buf = vmm_malloc(size))) {
m->m_flags |= M_EXT_HEAP;
MEXTADD(m, buf, size, ext_heap_free, NULL);
} else {
return NULL;
}
}
return m->m_extbuf;
}
void *vmm_dma_zalloc(virtual_size_t size)
{
void *ret = vmm_dma_malloc(size);
if (ret) {
memset(ret, 0, size);
}
return ret;
}
/*
* m_ext_dma_ensure: Ensure that the data buffer is DMA proof, reallocating
* and copying data to do so.
*/
void m_ext_dma_ensure(struct vmm_mbuf *m)
{
char *buf = NULL;
if (vmm_is_dma(m->m_extbuf)) {
return;
}
buf = vmm_dma_malloc(m->m_len);
memcpy(buf, m->m_extbuf, m->m_len);
if (m->m_extfree) {
m->m_extfree(m, m->m_extbuf, m->m_extlen, m->m_extarg);
} else {
vmm_free(m->m_extbuf);
}
MEXTADD(m, buf, m->m_len, ext_dma_free, 0);
}