package/ifxmips-atm/src/skb.c

   1 #include <linux/skbuff.h>
   2
   3 #include "common.h"
   4
   5 void resize_skb_rx(struct sk_buff *skb, unsigned int size, int is_cell)
   6 {
   7     if((u32)skb < 0x80000000)
   8     {
   9         int key = 0;
  10         printk("resize_skb_rx problem: skb = %08X, size = %d, is_cell = %d\n", (u32)skb, size, is_cell);
  11         while(!key){}
  12     }
  13     skb->data = (unsigned char*)(((u32)skb->head + 16 + (DMA_ALIGNMENT - 1)) & ~(DMA_ALIGNMENT - 1));
  14     skb->tail = skb->data;
  15
  16     /*  Set up other state  */
  17     skb->len = 0;
  18     skb->cloned = 0;
  19 #if defined(CONFIG_IMQ) || defined (CONFIG_IMQ_MODULE)
  20     skb->imq_flags = 0;
  21     skb->nf_info = NULL;
  22 #endif
  23     skb->data_len = 0;
  24 }
  25
  26 struct sk_buff* alloc_skb_rx(void)
  27 {
  28     struct sk_buff *skb;
  29
  30     /*  allocate memroy including trailer and padding   */
  31     skb = dev_alloc_skb(ppe_dev.aal5.rx_buffer_size + DMA_ALIGNMENT);
  32     if (skb)
  33     {
  34         /*  must be burst length alignment  */
  35         if ( ((u32)skb->data & (DMA_ALIGNMENT - 1)) != 0 )
  36             skb_reserve(skb, ~((u32)skb->data + (DMA_ALIGNMENT - 1)) & (DMA_ALIGNMENT - 1));
  37         /*  put skb in reserved area "skb->data - 4"    */
  38         *((u32*)skb->data - 1) = (u32)skb;
  39         /*  invalidate cache    */
  40         dma_cache_inv((unsigned long)skb->head, (u32)skb->end - (u32)skb->head);
  41     }
  42     return skb;
  43 }
  44
  45 void atm_free_tx_skb_vcc(struct sk_buff *skb)
  46 {
  47     struct atm_vcc* vcc;
  48
  49     if ( (u32)skb <= 0x80000000 )
  50     {
  51         volatile int key = 0;
  52         printk("atm_free_tx_skb_vcc: skb = %08X\n", (u32)skb);
  53         for ( ; !key; );
  54     }
  55
  56     vcc = ATM_SKB(skb)->vcc;
  57     if ( vcc != NULL && vcc->pop != NULL )
  58     {
  59         if ( atomic_read(&skb->users) == 0 )
  60         {
  61             volatile int key = 0;
  62             printk("atm_free_tx_skb_vcc(vcc->pop): skb->users == 0, skb = %08X\n", (u32)skb);
  63             for ( ; !key; );
  64         }
  65         vcc->pop(vcc, skb);
  66     }
  67     else
  68     {
  69         if ( atomic_read(&skb->users) == 0 )
  70         {
  71             volatile int key = 0;
  72             printk("atm_free_tx_skb_vcc(dev_kfree_skb_any): skb->users == 0, skb = %08X\n", (u32)skb);
  73             for ( ; !key; );
  74         }
  75         dev_kfree_skb_any(skb);
  76     }
  77 }
  78
  79 struct sk_buff* alloc_skb_tx(unsigned int size)
  80 {
  81     struct sk_buff *skb;
  82
  83     /*  allocate memory including header and padding    */
  84     size += TX_INBAND_HEADER_LENGTH + MAX_TX_PACKET_ALIGN_BYTES + MAX_TX_PACKET_PADDING_BYTES;
  85     size &= ~(DMA_ALIGNMENT - 1);
  86     skb = dev_alloc_skb(size + DMA_ALIGNMENT);
  87     /*  must be burst length alignment  */
  88     if ( skb )
  89         skb_reserve(skb, (~((u32)skb->data + (DMA_ALIGNMENT - 1)) & (DMA_ALIGNMENT - 1)) + TX_INBAND_HEADER_LENGTH);
  90     return skb;
  91 }
  92
  93 struct sk_buff* atm_alloc_tx(struct atm_vcc *vcc, unsigned int size)
  94 {
  95     int conn;
  96     struct sk_buff *skb;
  97
  98     /*  oversize packet */
  99     if ( ((size + TX_INBAND_HEADER_LENGTH + MAX_TX_PACKET_ALIGN_BYTES + MAX_TX_PACKET_PADDING_BYTES) & ~(DMA_ALIGNMENT - 1))  > ppe_dev.aal5.tx_max_packet_size )
 100     {
 101         printk("atm_alloc_tx: oversize packet\n");
 102         return NULL;
 103     }
 104     /*  send buffer overflow    */
 105     if ( atomic_read(&vcc->sk.sk_wmem_alloc) && !atm_may_send(vcc, size) )
 106     {
 107         printk("atm_alloc_tx: send buffer overflow\n");
 108         return NULL;
 109     }
 110     conn = find_vcc(vcc);
 111     if ( conn < 0 )
 112     {
 113         printk("atm_alloc_tx: unknown VCC\n");
 114         return NULL;
 115     }
 116
 117     skb = dev_alloc_skb(size);
 118     if ( skb == NULL )
 119     {
 120         printk("atm_alloc_tx: sk buffer is used up\n");
 121         return NULL;
 122     }
 123 #define ATM_PDU_OVHD 0
 124     atomic_add(skb->truesize + ATM_PDU_OVHD, &vcc->sk.sk_wmem_alloc);
 125
 126     return skb;
 127 }
 128