added code to support FEC networking

net/nif.c

@@ -0,0 +1,118 @@
+/*
+ * File:        nif.c
+ * Purpose:     Network InterFace routines
+ *
+ * Notes:
+ *
+ * Modifications:
+ *
+ */
+#include "net.h"
+#include "bas_types.h"
+#include <stdint.h>
+#include <stdbool.h>
+
+int nif_protocol_exist(NIF *nif, uint16_t protocol)
+{
+    /*
+     * This function searches the list of supported protocols
+     * on the particular NIF and if a protocol handler exists,
+     * true is returned.  This function is useful for network cards
+     * that needn't read in the entire frame but can discard frames
+     * arbitrarily.
+     */
+    int index;
+
+    for (index = 0; index < nif->num_protocol; ++index)
+    {
+        if (nif->protocol[index].protocol == protocol)
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+void nif_protocol_handler(NIF *nif, uint16_t protocol, NBUF *pNbuf)
+{
+    /*
+     * This function searches the list of supported protocols
+     * on the particular NIF and if a protocol handler exists,
+     * the protocol handler is invoked.  This routine called by
+     * network device driver after receiving a frame.
+     */
+    int index;
+
+    for (index = 0; index < nif->num_protocol; ++index)
+    {
+        if (nif->protocol[index].protocol == protocol)
+            nif->protocol[index].handler(nif,pNbuf);
+    }
+}
+
+void *nif_get_protocol_info (NIF *nif, uint16_t protocol)
+{
+    /*
+     * This function searches the list of supported protocols
+     * on the particular NIF and returns a pointer to the
+     * config info for 'protocol', otherwise NULL is returned.
+     */
+    int index;
+
+    for (index = 0; index < nif->num_protocol; ++index)
+    {
+        if (nif->protocol[index].protocol == protocol)
+            return (void *)nif->protocol[index].info;
+    }
+    return (void *)0;
+}
+
+int nif_bind_protocol (NIF *nif, uint16_t protocol,
+                   void (*handler)(NIF *,NBUF *),
+                   void *info)
+{
+    /*
+     * This function registers 'protocol' as a supported
+     * protocol in 'nif'.  
+     */
+    if (nif->num_protocol < (MAX_SUP_PROTO - 1))
+    {
+        nif->protocol[nif->num_protocol].protocol = protocol;
+        nif->protocol[nif->num_protocol].handler = (void(*)(NIF*,NBUF*))handler;
+        nif->protocol[nif->num_protocol].info = info;
+        ++nif->num_protocol;
+        return true;
+    }
+    return false;
+}
+
+NIF *nif_init (NIF *nif)
+{
+    int i;
+
+    for (i = 0; i < ETH_ADDR_LEN; ++i)
+    {
+        nif->hwa[i] = 0;
+        nif->broadcast[i] = 0xFF;
+    }
+
+    for (i = 0; i < MAX_SUP_PROTO; ++i)
+    {
+        nif->protocol[i].protocol = 0;
+        nif->protocol[i].handler = 0;
+        nif->protocol[i].info = 0;
+    }
+    nif->num_protocol = 0;
+
+    nif->mtu = 0;
+    nif->ch = 0;
+    nif->send = 0;
+
+    nif->f_rx = 0;
+    nif->f_tx = 0;
+    nif->f_rx_err = 0;
+    nif->f_tx_err = 0;
+    nif->f_err = 0;
+
+    return nif;
+}