-struct sk_buff* atm_alloc_tx(struct atm_vcc *vcc, unsigned int size)
-{
- int conn;
- struct sk_buff *skb;
-
- /* oversize packet */
- if ( size > aal5s_max_packet_size ) {
- pr_err("atm_alloc_tx: oversize packet\n");
- return NULL;
- }
- /* send buffer overflow */
- if ( sk_wmem_alloc_get(sk_atm(vcc)) && !atm_may_send(vcc, size) ) {
- pr_err("atm_alloc_tx: send buffer overflow\n");
- return NULL;
- }
- conn = find_vcc(vcc);
- if ( conn < 0 ) {
- pr_err("atm_alloc_tx: unknown VCC\n");
- return NULL;
- }
-
- skb = dev_alloc_skb(size);
- if ( skb == NULL ) {
- pr_err("atm_alloc_tx: sk buffer is used up\n");
- return NULL;
- }
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0))
- refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
-#else
- atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
-#endif
-
- return skb;
-}
-