From 6d5918487d06c85c193d01c12f2297ca3d9f6433 Mon Sep 17 00:00:00 2001
From: blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 2 Oct 2009 09:41:22 +0000
Subject: adds atm driver for ifxmips, code ported from wippies 2.6.16 gpl
 release. it compiles but throws ioctl -EINVAL during bring up of atm device,
 hence marked as broken

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17819 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 package/ifxmips-atm/src/skb.c | 128 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 package/ifxmips-atm/src/skb.c

(limited to 'package/ifxmips-atm/src/skb.c')

diff --git a/package/ifxmips-atm/src/skb.c b/package/ifxmips-atm/src/skb.c
new file mode 100644
index 000000000..7ad60fd75
--- /dev/null
+++ b/package/ifxmips-atm/src/skb.c
@@ -0,0 +1,128 @@
+#include <linux/skbuff.h>
+
+#include "common.h"
+
+void resize_skb_rx(struct sk_buff *skb, unsigned int size, int is_cell)
+{
+    if((u32)skb < 0x80000000)
+    {
+        int key = 0;
+        printk("resize_skb_rx problem: skb = %08X, size = %d, is_cell = %d\n", (u32)skb, size, is_cell);
+        while(!key){}
+    }
+    skb->data = (unsigned char*)(((u32)skb->head + 16 + (DMA_ALIGNMENT - 1)) & ~(DMA_ALIGNMENT - 1));
+    skb->tail = skb->data;
+
+    /*  Set up other state  */
+    skb->len = 0;
+    skb->cloned = 0;
+#if defined(CONFIG_IMQ) || defined (CONFIG_IMQ_MODULE)
+    skb->imq_flags = 0;
+    skb->nf_info = NULL;
+#endif
+    skb->data_len = 0;
+}
+
+struct sk_buff* alloc_skb_rx(void)
+{
+    struct sk_buff *skb;
+
+    /*  allocate memroy including trailer and padding   */
+    skb = dev_alloc_skb(ppe_dev.aal5.rx_buffer_size + DMA_ALIGNMENT);
+    if (skb)
+    {
+        /*  must be burst length alignment  */
+        if ( ((u32)skb->data & (DMA_ALIGNMENT - 1)) != 0 )
+            skb_reserve(skb, ~((u32)skb->data + (DMA_ALIGNMENT - 1)) & (DMA_ALIGNMENT - 1));
+        /*  put skb in reserved area "skb->data - 4"    */
+        *((u32*)skb->data - 1) = (u32)skb;
+        /*  invalidate cache    */
+        dma_cache_inv((unsigned long)skb->head, (u32)skb->end - (u32)skb->head);
+    }
+    return skb;
+}
+
+void atm_free_tx_skb_vcc(struct sk_buff *skb)
+{
+    struct atm_vcc* vcc;
+
+    if ( (u32)skb <= 0x80000000 )
+    {
+        volatile int key = 0;
+        printk("atm_free_tx_skb_vcc: skb = %08X\n", (u32)skb);
+        for ( ; !key; );
+    }
+
+    vcc = ATM_SKB(skb)->vcc;
+    if ( vcc != NULL && vcc->pop != NULL )
+    {
+        if ( atomic_read(&skb->users) == 0 )
+        {
+            volatile int key = 0;
+            printk("atm_free_tx_skb_vcc(vcc->pop): skb->users == 0, skb = %08X\n", (u32)skb);
+            for ( ; !key; );
+        }
+        vcc->pop(vcc, skb);
+    }
+    else
+    {
+        if ( atomic_read(&skb->users) == 0 )
+        {
+            volatile int key = 0;
+            printk("atm_free_tx_skb_vcc(dev_kfree_skb_any): skb->users == 0, skb = %08X\n", (u32)skb);
+            for ( ; !key; );
+        }
+        dev_kfree_skb_any(skb);
+    }
+}
+
+struct sk_buff* alloc_skb_tx(unsigned int size)
+{
+    struct sk_buff *skb;
+
+    /*  allocate memory including header and padding    */
+    size += TX_INBAND_HEADER_LENGTH + MAX_TX_PACKET_ALIGN_BYTES + MAX_TX_PACKET_PADDING_BYTES;
+    size &= ~(DMA_ALIGNMENT - 1);
+    skb = dev_alloc_skb(size + DMA_ALIGNMENT);
+    /*  must be burst length alignment  */
+    if ( skb )
+        skb_reserve(skb, (~((u32)skb->data + (DMA_ALIGNMENT - 1)) & (DMA_ALIGNMENT - 1)) + TX_INBAND_HEADER_LENGTH);
+    return skb;
+}
+
+struct sk_buff* atm_alloc_tx(struct atm_vcc *vcc, unsigned int size)
+{
+    int conn;
+    struct sk_buff *skb;
+
+    /*  oversize packet */
+    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 )
+    {
+        printk("atm_alloc_tx: oversize packet\n");
+        return NULL;
+    }
+    /*  send buffer overflow    */
+    if ( atomic_read(&vcc->sk.sk_wmem_alloc) && !atm_may_send(vcc, size) )
+    {
+        printk("atm_alloc_tx: send buffer overflow\n");
+        return NULL;
+    }
+    conn = find_vcc(vcc);
+    if ( conn < 0 )
+    {
+        printk("atm_alloc_tx: unknown VCC\n");
+        return NULL;
+    }
+
+    skb = dev_alloc_skb(size);
+    if ( skb == NULL )
+    {
+        printk("atm_alloc_tx: sk buffer is used up\n");
+        return NULL;
+    }
+#define ATM_PDU_OVHD 0
+    atomic_add(skb->truesize + ATM_PDU_OVHD, &vcc->sk.sk_wmem_alloc);
+
+    return skb;
+}
+
-- 
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