eth: take size_t size in eth_process

kernel-src/include/kernel/eth.h

@@ -1,6 +1,7 @@
 #ifndef _ETH_H
 #define _ETH_H
 
+#include <stddef.h>
 #include <stdint.h>
 #include <kernel/net.h>
 
@@ -13,6 +14,6 @@ typedef struct {
 #define ETH_PROTO_IP 0x0800
 #define ETH_PROTO_ARP 0x0806
 
-void eth_process(netdev_t *netdev, void *buffer);
+void eth_process(netdev_t *netdev, void *buffer, size_t size);
 
 #endif

kernel-src/io/net/eth.c

@@ -3,7 +3,10 @@
 #include <logging.h>
 
 // runs on dpc context, called by the individual driver dpcs on a receive.
-void eth_process(netdev_t *netdev, void *buffer) {
+void eth_process(netdev_t *netdev, void *buffer, size_t size) {
+	if (size < sizeof(ethframe_t))
+		return;
+
 	ethframe_t *frame = buffer;
 
 	mac_t dst, src;

kernel-src/io/net/loopback.c

@@ -40,7 +40,7 @@ static int loopback_sendpacket(netdev_t *netdev, netdesc_t desc, mac_t targetmac
 	memcpy(desc.address, &ethframe, sizeof(ethframe_t));
 
 	long ipl = interrupt_raiseipl(IPL_DPC);
-	eth_process(netdev, desc.address);
+	eth_process(netdev, desc.address, desc.size);
 	interrupt_loweripl(ipl);
 
 	return netdev->freedesc(netdev, &desc);

kernel-src/io/net/rtl8169.c

@@ -54,6 +54,7 @@
 #define RX_DESCRIPTOR_COUNT 1024
 #define TX_DESCRIPTOR_COUNT 1024
 #define RX_BUFFER_SIZE 1524
+#define RX_FCS_SIZE 4
 
 #define DESCRIPTOR_OWN (1 << 15)
 #define DESCRIPTOR_EOR (1 << 14)
@@ -133,7 +134,8 @@ static void rtl8169_dpc_rx(context_t *, dpcarg_t arg) {
 		volatile descriptor_t *descriptor = &dev->rx_ring[dev->rx_next];
 		void *buffer = MAKE_HHDM((void *)(descriptor->addr_low | ((uint64_t)descriptor->addr_high << 32)));
 
-		eth_process(&dev->netdev, buffer);
+		if (descriptor->length >= RX_FCS_SIZE)
+			eth_process(&dev->netdev, buffer, descriptor->length - RX_FCS_SIZE);
 
 		uint16_t eor = descriptor->flags & DESCRIPTOR_EOR;
 		descriptor->length = RX_BUFFER_SIZE;

kernel-src/io/net/u80211/kernel_interface.c

@@ -299,6 +299,5 @@ static void u80211_kernel_interface_init(void) {
 INIT_ROUTINE_DEFINE(u80211, INIT_ROUTINE_FLAGS_NONE, u80211_kernel_interface_init, work_queue);
 
 void u80211_kernel_receive_callback(u80211_device_t *device, void *buffer, size_t size) {
-	(void)size;
-	eth_process(device->driver_data, buffer);
+	eth_process(device->driver_data, buffer, size);
 }

kernel-src/io/net/vionet.c

@@ -45,8 +45,11 @@ static void rx_dpc(context_t *context, dpcarg_t arg) {
 	while (netdev->rxqueue.lastusedindex != VIO_QUEUE_DEV_IDX(&netdev->rxqueue)) {
 		int idx = netdev->rxqueue.lastusedindex++ % netdev->rxqueue.size;
 		int buffidx = VIO_QUEUE_DEV_RING(&netdev->rxqueue)[idx].index;
-		void *ethbufferphys = (void *)(buffers[buffidx].address + sizeof(vioframe_t));
-		eth_process((netdev_t *)netdev, MAKE_HHDM(ethbufferphys));
+		size_t size = VIO_QUEUE_DEV_RING(&netdev->rxqueue)[idx].length;
+		if (size >= sizeof(vioframe_t)) {
+			void *phys = (void *)(buffers[buffidx].address + sizeof(vioframe_t));
+			eth_process((netdev_t *)netdev, MAKE_HHDM(phys), size - sizeof(vioframe_t));
+		}
 		VIO_QUEUE_DRV_RING(&netdev->rxqueue)[VIO_QUEUE_DRV_IDX(&netdev->rxqueue)++ % netdev->rxqueue.size] = buffidx;
 		*netdev->rxqueue.notify = 0;
 	}