support for RX and TX timestamps

contrib/ports/xmos/include/netif/ethernetif.h

@@ -39,7 +39,7 @@ int xcore_ethernetif_init(const uint8_t* mac_address_phy, const xtcp_ipconfig_t*
 void xcore_lwip_init_timers(uint32_t period[NUM_TIMEOUTS], uint32_t timeout[NUM_TIMEOUTS], uint32_t time_now);
 
 /* LwIP Ethernet packet input function */
-void ethernetif_input(const uint8_t buffer[], int32_t n_bytes);
+void ethernetif_input(const uint8_t buffer[], int32_t n_bytes, uint32_t timestamp);
 
 /* Wrapper for LwIP link notifications */
 void xcore_net_link_up(void);

contrib/ports/xmos/include/netif/xcore_netif_output.h

@@ -26,4 +26,6 @@ void xcore_netif_output_init(client ethernet_tx_if ?i_eth_tx, client mii_if ?i_m
  */
 void xcore_netif_low_level_output(int buffer[], size_t n_bytes);
 
+uint32_t xcore_netif_low_level_output_timed(int buffer[], size_t n_bytes);
+
 #endif /* __XCORE_NETIF_H__ */

contrib/ports/xmos/lib/minimal/lwipopts.h

@@ -160,7 +160,20 @@
 
 // Custom data in pbuf to hold remote address for UDP recvfrom()
 #include "xtcp.h"
-#define LWIP_PBUF_CUSTOM_DATA xtcp_host_t remote;
-#define LWIP_PBUF_CUSTOM_DATA_INIT(p) p->remote.ipaddr[0] = 0; p->remote.ipaddr[1] = 0; p->remote.ipaddr[2] = 0; p->remote.ipaddr[3] = 0; p->remote.port_number = 0;
+#define LWIP_PBUF_CUSTOM_DATA         \
+  xtcp_host_t remote;                 \
+  unsigned timestamp;
+
+#define LWIP_PBUF_CUSTOM_DATA_INIT(p) \
+  p->remote.ipaddr[0] = 0;            \
+  p->remote.ipaddr[1] = 0;            \
+  p->remote.ipaddr[2] = 0;            \
+  p->remote.ipaddr[3] = 0;            \
+  p->remote.port_number = 0;          \
+  p->timestamp = 0;
+
+// this reuses the flag field to avoid adding an additional field;
+// care should be taken if lwIP adds additional flags
+#define PBUF_FLAG_TX_TIMESTAMP      0x80
 
 #endif /* __LWIPOPTS_H__ */

contrib/ports/xmos/lib/standard/lwipopts.h

@@ -159,7 +159,20 @@
 
 // Custom data in pbuf to hold remote address for UDP recvfrom()
 #include "xtcp.h"
-#define LWIP_PBUF_CUSTOM_DATA xtcp_host_t remote;
-#define LWIP_PBUF_CUSTOM_DATA_INIT(p) p->remote.ipaddr[0] = 0; p->remote.ipaddr[1] = 0; p->remote.ipaddr[2] = 0; p->remote.ipaddr[3] = 0; p->remote.port_number = 0;
+#define LWIP_PBUF_CUSTOM_DATA         \
+  xtcp_host_t remote;                 \
+  unsigned timestamp;
+
+#define LWIP_PBUF_CUSTOM_DATA_INIT(p) \
+  p->remote.ipaddr[0] = 0;            \
+  p->remote.ipaddr[1] = 0;            \
+  p->remote.ipaddr[2] = 0;            \
+  p->remote.ipaddr[3] = 0;            \
+  p->remote.port_number = 0;          \
+  p->timestamp = 0;
+
+// this reuses the flag field to avoid adding an additional field;
+// care should be taken if lwIP adds additional flags
+#define PBUF_FLAG_TX_TIMESTAMP      0x80
 
 #endif /* __LWIPOPTS_H__ */

contrib/ports/xmos/port/ethernetif.c

@@ -162,12 +162,18 @@ static err_t xcore_ethernetif_linkoutput(struct netif *netif, struct pbuf *p) {
 
     n_bytes = 60;
     /* Start MAC transmit here */
-    xcore_netif_low_level_output(txbuf, n_bytes);
+    if (p->flags & PBUF_FLAG_TX_TIMESTAMP)
+      p->timestamp = xcore_netif_low_level_output_timed(txbuf, n_bytes);
+    else
+      xcore_netif_low_level_output(txbuf, n_bytes);
   } else {
     // NOTE: this is not expecting or setup to deal with pbuf chains
 
     /* Start MAC transmit here */
-    xcore_netif_low_level_output(p->payload, n_bytes);
+    if (p->flags & PBUF_FLAG_TX_TIMESTAMP)
+      p->timestamp = xcore_netif_low_level_output_timed(p->payload, n_bytes);
+    else
+      xcore_netif_low_level_output(p->payload, n_bytes);
   }
 
 #if ETH_PAD_SIZE
@@ -324,12 +330,14 @@ void xcore_timeout(xtcp_lwip_timeout_type timeout) {
  * interface.
  *
  */
-void ethernetif_input(const uint8_t buffer[], int32_t n_bytes) {
+void ethernetif_input(const uint8_t buffer[], int32_t n_bytes, uint32_t timestamp) {
   /* move received packet into a new pbuf */
   struct pbuf *p = xcore_net_low_level_input(buffer, n_bytes);
 
   /* if no packet could be read, silently ignore this */
   if (p != NULL) {
+    p->timestamp = timestamp;
+
     /* pass all packets to ethernet_input, which decides what packets it supports */
     if (xcore_netif.input(p, &xcore_netif) != ERR_OK) {
 

contrib/ports/xmos/port/xcore_netif_output.xc

@@ -62,3 +62,17 @@ void xcore_netif_low_level_output(int buffer[], size_t n_bytes) {
     fail("xcore_netif_low_level_output: netif output interface not set.\n");
   }
 }
+
+uint32_t xcore_netif_low_level_output_timed(int buffer[], size_t n_bytes) {
+  if (xcore_netif_eth == XCORE_NETIF_ETH_TX) {
+    unsafe {
+      // TODO - Check whether ETHERNET_ALL_INTERFACES is correct when we support dual-PHY
+      return ((client interface ethernet_tx_if)xtcp_i_eth_tx).send_timed_packet((char *)buffer,
+                                                                                n_bytes,
+                                                                                ETHERNET_ALL_INTERFACES);
+    }
+  } else {
+    fail("xcore_netif_low_level_output: netif output interface not set.\n");
+    return 0;
+  }
+}