network: Update device statistics (mostly) in the stack.

We bypass device logic in datalink_send_routed_data() in the case
of RTF_LOCAL, so if we don't update the stats there, they'll never
get updated. Furthermore, there's places packets can be dropped
inside the device reader thread. So, we might as well consolidate
the stats-updating logic and get it out of drivers.

(The only remaining case where drivers need to update stats is when
they drop a packet in receive(), as the stack can't tell when an error
from receive() is due to a dropped packet or not.)

Fixes a potential leak on packet drops in the device reader thread,
and fixes loopback statistics for TCP/UDP/etc.

src/add-ons/kernel/network/devices/dialup/dialup.cpp

@@ -448,14 +448,10 @@ dialup_send_data(net_device* _device, net_buffer* buffer)
 	}
 	device->last_closing_flag_sequence_time = system_time();
 
-	device->stats.send.packets++;
-	device->stats.send.bytes += bytesWritten;
 	status = B_OK;
 	goto done;
 
 err:
-	device->stats.send.errors++;
-
 done:
 	free(ioVectors);
 	free(packet);
@@ -502,20 +498,16 @@ dialup_receive_data(net_device* _device, net_buffer** _buffer)
 
 	status = gBufferModule->trim(buffer, bytesRead);
 	if (status < B_OK) {
-		device->stats.receive.dropped++;
+		atomic_add((int32*)&device->stats.receive.dropped, 1);
 		goto err;
 	}
 
-	device->stats.receive.bytes += bytesRead;
-	device->stats.receive.packets++;
-
 	*_buffer = buffer;
 	status = B_OK;
 	goto done;
 
 err:
 	gBufferModule->free(buffer);
-	device->stats.receive.errors++;
 
 done:
 	free(packet);

src/add-ons/kernel/network/devices/ethernet/ethernet.cpp

@@ -313,8 +313,7 @@ ethernet_send_data(net_device *_device, net_buffer *buffer)
 			if (gBufferModule->count_iovecs(allocated) > 1) {
 				dprintf("ethernet_send_data: no write buffer, cannot perform scatter I/O\n");
 				gBufferModule->free(allocated);
-				device->stats.send.errors++;
-				return B_NOT_SUPPORTED;
+				return EMSGSIZE;
 			}
 
 			gBufferModule->get_iovecs(buffer, &iovec, 1);
@@ -328,15 +327,11 @@ ethernet_send_data(net_device *_device, net_buffer *buffer)
 //dprintf("sent: %ld\n", bytesWritten);
 
 	if (bytesWritten < 0) {
-		atomic_add((int32*)&device->stats.send.errors, 1);
 		if (allocated)
 			gBufferModule->free(allocated);
 		return errno;
 	}
 
-	atomic_add((int32*)&device->stats.send.packets, 1);
-	atomic_add64((int64*)&device->stats.send.bytes, bytesWritten);
-
 	gBufferModule->free(original);
 	if (allocated)
 		gBufferModule->free(allocated);
@@ -382,7 +377,6 @@ ethernet_receive_data(net_device *_device, net_buffer **_buffer)
 
 	bytesRead = read(device->fd, iovec.iov_base, iovec.iov_len);
 	if (bytesRead < 0) {
-		atomic_add((int32*)&device->stats.receive.errors, 1);
 		status = errno;
 		goto err;
 	}
@@ -397,9 +391,6 @@ ethernet_receive_data(net_device *_device, net_buffer **_buffer)
 		goto err;
 	}
 
-	atomic_add((int32*)&device->stats.receive.packets, 1);
-	atomic_add64((int64*)&device->stats.receive.bytes, bytesRead);
-
 	*_buffer = buffer;
 	return B_OK;
 

src/add-ons/kernel/network/devices/loopback/loopback.cpp

@@ -110,14 +110,7 @@ loopback_control(net_device *device, int32 op, void *argument,
 status_t
 loopback_send_data(net_device *device, net_buffer *buffer)
 {
-	status_t status = sStackModule->device_enqueue_buffer(device, buffer);
-	if (status == B_OK) {
-		atomic_add64((int64*)&device->stats.send.bytes, buffer->size);
-		atomic_add((int32*)&device->stats.send.packets, 1);
-	} else {
-		atomic_add((int32*)&device->stats.send.errors, 1);
-	}
-	return status;
+	return sStackModule->device_enqueue_buffer(device, buffer);
 }
 
 

src/add-ons/kernel/network/devices/tunnel/tunnel.cpp

@@ -247,13 +247,6 @@ tunnel_write(void* _cookie, off_t position, const void* data, size_t* _length)
 	if (status != B_OK)
 		gBufferModule->free(buffer);
 
-	if (status == B_OK) {
-		atomic_add((int32*)&cookie->device->stats.receive.packets, 1);
-		atomic_add64((int64*)&cookie->device->stats.receive.bytes, buffer->size);
-	} else {
-		atomic_add((int32*)&cookie->device->stats.receive.errors, 1);
-	}
-
 	return status;
 }
 
@@ -468,14 +461,10 @@ tunnel_send_data(net_device* _device, net_buffer* buffer)
 	status = gStackModule->fifo_enqueue_buffer(
 		&device->send_queue, buffer);
 	if (status == B_OK) {
-		atomic_add((int32*)&device->stats.send.packets, 1);
-		atomic_add64((int64*)&device->stats.send.bytes, buffer->size);
-	} else {
-		atomic_add((int32*)&device->stats.send.errors, 1);
+		MutexLocker selectLocker(device->select_lock);
+		notify_select_event_pool(device->select_pool, B_SELECT_READ);
 	}
 
-	MutexLocker selectLocker(device->select_lock);
-	notify_select_event_pool(device->select_pool, B_SELECT_READ);
 	return status;
 }
 

src/add-ons/kernel/network/ppp/ppp/ppp.cpp

@@ -193,13 +193,11 @@ ppp_send_data(net_device *_device, net_buffer *buffer)
 	ppp_device *device = (ppp_device *)_device;
 
 	if (buffer->size > device->frame_size || buffer->size < device->header_length) {
-		device->stats.send.errors++;
 		dprintf("sorry! fail send ppp packet, size wrong!\n");
-		return B_BAD_VALUE;
+		return EMSGSIZE;
 	}
 
 	if (device->KPPP_Interface == NULL) {
-		device->stats.send.errors++;
 		dprintf("Fail send ppp packet, no eth for ppp!\n");
 		return B_BAD_VALUE;
 	}
@@ -209,14 +207,10 @@ ppp_send_data(net_device *_device, net_buffer *buffer)
 	status_t status = device->KPPP_Interface->Send(buffer, 0x0021); // IP_PROTOCOL 0x0021
 
 	if (status != B_OK) {
-		device->stats.send.errors++;
 		dprintf("KPPP_Interface->Send(buffer, 0x0021 IP) fail\n");
 		return B_BAD_VALUE;
 	}
 
-	device->stats.send.packets++;
-	device->stats.send.bytes += net_buffer_size;
-
 	return B_OK;
 }
 
@@ -239,8 +233,6 @@ ppp_receive_data(net_device *_device, net_buffer **_buffer)
 	}
 
 	// (*_buffer)->interface_address = NULL; // strange need to put here
-	device->stats.receive.bytes += (*_buffer)->size;
-	device->stats.receive.packets++;
 
 	return B_OK;
 }

src/add-ons/kernel/network/stack/datalink.cpp

@@ -194,6 +194,21 @@ fill_address(const sockaddr* from, sockaddr* to, size_t maxLength)
 }
 
 
+static void
+update_device_send_stats(struct net_device* device, status_t status, size_t packetSize)
+{
+	if (status == B_OK) {
+		atomic_add((int32*)&device->stats.send.packets, 1);
+		atomic_add64((int64*)&device->stats.send.bytes, packetSize);
+	} else {
+		if (status == ENOBUFS || status == EMSGSIZE)
+			atomic_add((int32*)&device->stats.send.dropped, 1);
+		else
+			atomic_add((int32*)&device->stats.send.errors, 1);
+	}
+}
+
+
 //	#pragma mark - datalink module
 
 
@@ -411,8 +426,12 @@ datalink_send_routed_data(struct net_route* route, net_buffer* buffer)
 		}
 
 		// this one goes back to the domain directly
-		return fifo_enqueue_buffer(
+		const size_t packetSize = buffer->size;
+		status_t status = fifo_enqueue_buffer(
 			&interface->DeviceInterface()->receive_queue, buffer);
+		update_device_send_stats(interface->DeviceInterface()->device,
+			status, packetSize);
+		return status;
 	}
 
 	if ((route->flags & RTF_GATEWAY) != 0) {
@@ -721,7 +740,10 @@ interface_protocol_send_data(net_datalink_protocol* _protocol,
 	if (atomic_get(&interface->DeviceInterface()->monitor_count) > 0)
 		device_interface_monitor_receive(interface->DeviceInterface(), buffer);
 
-	return protocol->device_module->send_data(protocol->device, buffer);
+	const size_t packetSize = buffer->size;
+	status_t status = protocol->device_module->send_data(protocol->device, buffer);
+	update_device_send_stats(protocol->device, status, packetSize);
+	return status;
 }
 
 

src/add-ons/kernel/network/stack/device_interfaces.cpp

@@ -64,14 +64,25 @@ device_reader_thread(void* _interface)
 
 			if (interface->deframe_func(interface->device, buffer) != B_OK) {
 				gNetBufferModule.free(buffer);
+				atomic_add((int32*)&device->stats.receive.dropped, 1);
 				continue;
 			}
 
-			fifo_enqueue_buffer(&interface->receive_queue, buffer);
+			const size_t packetSize = buffer->size;
+			status = fifo_enqueue_buffer(&interface->receive_queue, buffer);
+			if (status == B_OK) {
+				atomic_add((int32*)&device->stats.receive.packets, 1);
+				atomic_add64((int64*)&device->stats.receive.bytes, packetSize);
+			} else {
+				gNetBufferModule.free(buffer);
+				atomic_add((int32*)&device->stats.receive.dropped, 1);
+			}
 		} else if (status == B_DEVICE_NOT_FOUND) {
 			device_removed(device);
 			return status;
 		} else {
+			atomic_add((int32*)&device->stats.receive.errors, 1);
+
 			// In case of error, give the other threads some
 			// time to run since this is a high priority time thread.
 			snooze(10000);