Introduce new eth_receive routine
The purpose of this routine is receiving a single network frame, outside of
U-Boot's NetLoop(). Exporting it to standalone programs that run on top of
U-Boot will let them utilise networking facilities. For sending a raw frame
the already existing eth_send() can be used.
The direct consumer of this routine is the newly introduced API layer for
external applications (enabled with CONFIG_API).
Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
Signed-off-by: Piotr Kruszynski <ppk@semihalf.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/net.h b/include/net.h
index 603452a..f6decdc 100644
--- a/include/net.h
+++ b/include/net.h
@@ -122,6 +122,9 @@
extern int eth_init(bd_t *bis); /* Initialize the device */
extern int eth_send(volatile void *packet, int length); /* Send a packet */
+#ifdef CONFIG_API
+extern int eth_receive(volatile void *packet, int length); /* Receive a packet */
+#endif
extern int eth_rx(void); /* Check for received packets */
extern void eth_halt(void); /* stop SCC */
extern char *eth_get_name(void); /* get name of current device */
diff --git a/net/eth.c b/net/eth.c
index 1b56a35..4657f79 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -62,6 +62,17 @@
extern int atstk1000_eth_initialize(bd_t *);
extern int mcffec_initialize(bd_t*);
+#ifdef CONFIG_API
+extern void (*push_packet)(volatile void *, int);
+
+static struct {
+ uchar data[PKTSIZE];
+ int length;
+} eth_rcv_bufs[PKTBUFSRX];
+
+static unsigned int eth_rcv_current = 0, eth_rcv_last = 0;
+#endif
+
static struct eth_device *eth_devices, *eth_current;
struct eth_device *eth_get_dev(void)
@@ -457,6 +468,53 @@
return eth_current->recv(eth_current);
}
+#ifdef CONFIG_API
+static void eth_save_packet(volatile void *packet, int length)
+{
+ volatile char *p = packet;
+ int i;
+
+ if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
+ return;
+
+ if (PKTSIZE < length)
+ return;
+
+ for (i = 0; i < length; i++)
+ eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
+
+ eth_rcv_bufs[eth_rcv_last].length = length;
+ eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
+}
+
+int eth_receive(volatile void *packet, int length)
+{
+ volatile char *p = packet;
+ void *pp = push_packet;
+ int i;
+
+ if (eth_rcv_current == eth_rcv_last) {
+ push_packet = eth_save_packet;
+ eth_rx();
+ push_packet = pp;
+
+ if (eth_rcv_current == eth_rcv_last)
+ return -1;
+ }
+
+ if (length < eth_rcv_bufs[eth_rcv_current].length)
+ return -1;
+
+ length = eth_rcv_bufs[eth_rcv_current].length;
+
+ for (i = 0; i < length; i++)
+ p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
+
+ eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
+ return length;
+}
+#endif /* CONFIG_API */
+
void eth_try_another(int first_restart)
{
static struct eth_device *first_failed = NULL;
diff --git a/net/net.c b/net/net.c
index c719bc4..cac3e09 100644
--- a/net/net.c
+++ b/net/net.c
@@ -137,6 +137,9 @@
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar NetEtherNullAddr[6] =
{ 0, 0, 0, 0, 0, 0 };
+#ifdef CONFIG_API
+void (*push_packet)(volatile void *, int len) = 0;
+#endif
#if defined(CONFIG_CMD_CDP)
uchar NetCDPAddr[6] = /* Ethernet bcast address */
{ 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
@@ -1161,6 +1164,13 @@
if (len < ETHER_HDR_SIZE)
return;
+#ifdef CONFIG_API
+ if (push_packet) {
+ (*push_packet)(inpkt, len);
+ return;
+ }
+#endif
+
#if defined(CONFIG_CMD_CDP)
/* keep track if packet is CDP */
iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;