drivers: net: ethernet: qualcomm: rmnet: Initial implementation
RmNet driver provides a transport agnostic MAP (multiplexing and aggregation protocol) support in embedded module. Module provides virtual network devices which can be attached to any IP-mode physical device. This will be used to provide all MAP functionality on future hardware in a single consistent location. Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Subash Abhinov Kasiviswanathan
David S. Miller
parent
cdf4969c42
commit
ceed73a2cf
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@ -0,0 +1,82 @@
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1. Introduction
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rmnet driver is used for supporting the Multiplexing and aggregation
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Protocol (MAP). This protocol is used by all recent chipsets using Qualcomm
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Technologies, Inc. modems.
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This driver can be used to register onto any physical network device in
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IP mode. Physical transports include USB, HSIC, PCIe and IP accelerator.
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Multiplexing allows for creation of logical netdevices (rmnet devices) to
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handle multiple private data networks (PDN) like a default internet, tethering,
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multimedia messaging service (MMS) or IP media subsystem (IMS). Hardware sends
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packets with MAP headers to rmnet. Based on the multiplexer id, rmnet
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routes to the appropriate PDN after removing the MAP header.
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Aggregation is required to achieve high data rates. This involves hardware
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sending aggregated bunch of MAP frames. rmnet driver will de-aggregate
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these MAP frames and send them to appropriate PDN's.
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2. Packet format
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a. MAP packet (data / control)
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MAP header has the same endianness of the IP packet.
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Packet format -
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Bit 0 1 2-7 8 - 15 16 - 31
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Function Command / Data Reserved Pad Multiplexer ID Payload length
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Bit 32 - x
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Function Raw Bytes
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Command (1)/ Data (0) bit value is to indicate if the packet is a MAP command
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or data packet. Control packet is used for transport level flow control. Data
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packets are standard IP packets.
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Reserved bits are usually zeroed out and to be ignored by receiver.
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Padding is number of bytes to be added for 4 byte alignment if required by
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hardware.
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Multiplexer ID is to indicate the PDN on which data has to be sent.
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Payload length includes the padding length but does not include MAP header
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length.
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b. MAP packet (command specific)
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Bit 0 1 2-7 8 - 15 16 - 31
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Function Command Reserved Pad Multiplexer ID Payload length
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Bit 32 - 39 40 - 45 46 - 47 48 - 63
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Function Command name Reserved Command Type Reserved
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Bit 64 - 95
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Function Transaction ID
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Bit 96 - 127
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Function Command data
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Command 1 indicates disabling flow while 2 is enabling flow
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Command types -
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0 for MAP command request
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1 is to acknowledge the receipt of a command
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2 is for unsupported commands
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3 is for error during processing of commands
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c. Aggregation
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Aggregation is multiple MAP packets (can be data or command) delivered to
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rmnet in a single linear skb. rmnet will process the individual
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packets and either ACK the MAP command or deliver the IP packet to the
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network stack as needed
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MAP header|IP Packet|Optional padding|MAP header|IP Packet|Optional padding....
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MAP header|IP Packet|Optional padding|MAP header|Command Packet|Optional pad...
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3. Userspace configuration
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rmnet userspace configuration is done through netlink library librmnetctl
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and command line utility rmnetcli. Utility is hosted in codeaurora forum git.
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The driver uses rtnl_link_ops for communication.
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https://source.codeaurora.org/quic/la/platform/vendor/qcom-opensource/dataservices/tree/rmnetctl
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@ -59,4 +59,6 @@ config QCOM_EMAC
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low power, Receive-Side Scaling (RSS), and IEEE 1588-2008
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Precision Clock Synchronization Protocol.
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source "drivers/net/ethernet/qualcomm/rmnet/Kconfig"
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endif # NET_VENDOR_QUALCOMM
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@ -9,3 +9,5 @@ obj-$(CONFIG_QCA7000_UART) += qcauart.o
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qcauart-objs := qca_uart.o
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obj-y += emac/
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obj-$(CONFIG_RMNET) += rmnet/
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@ -0,0 +1,12 @@
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#
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# RMNET MAP driver
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#
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menuconfig RMNET
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tristate "RmNet MAP driver"
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default n
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---help---
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If you select this, you will enable the RMNET module which is used
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for handling data in the multiplexing and aggregation protocol (MAP)
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format in the embedded data path. RMNET devices can be attached to
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any IP mode physical device.
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@ -0,0 +1,10 @@
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#
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# Makefile for the RMNET module
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#
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rmnet-y := rmnet_config.o
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rmnet-y += rmnet_vnd.o
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rmnet-y += rmnet_handlers.o
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rmnet-y += rmnet_map_data.o
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rmnet-y += rmnet_map_command.o
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obj-$(CONFIG_RMNET) += rmnet.o
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@ -0,0 +1,419 @@
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/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* RMNET configuration engine
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*
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*/
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#include <net/sock.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netdevice.h>
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#include "rmnet_config.h"
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#include "rmnet_handlers.h"
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#include "rmnet_vnd.h"
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#include "rmnet_private.h"
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/* Locking scheme -
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* The shared resource which needs to be protected is realdev->rx_handler_data.
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* For the writer path, this is using rtnl_lock(). The writer paths are
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* rmnet_newlink(), rmnet_dellink() and rmnet_force_unassociate_device(). These
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* paths are already called with rtnl_lock() acquired in. There is also an
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* ASSERT_RTNL() to ensure that we are calling with rtnl acquired. For
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* dereference here, we will need to use rtnl_dereference(). Dev list writing
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* needs to happen with rtnl_lock() acquired for netdev_master_upper_dev_link().
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* For the reader path, the real_dev->rx_handler_data is called in the TX / RX
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* path. We only need rcu_read_lock() for these scenarios. In these cases,
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* the rcu_read_lock() is held in __dev_queue_xmit() and
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* netif_receive_skb_internal(), so readers need to use rcu_dereference_rtnl()
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* to get the relevant information. For dev list reading, we again acquire
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* rcu_read_lock() in rmnet_dellink() for netdev_master_upper_dev_get_rcu().
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* We also use unregister_netdevice_many() to free all rmnet devices in
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* rmnet_force_unassociate_device() so we dont lose the rtnl_lock() and free in
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* same context.
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*/
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/* Local Definitions and Declarations */
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#define RMNET_LOCAL_LOGICAL_ENDPOINT -1
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struct rmnet_walk_data {
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struct net_device *real_dev;
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struct list_head *head;
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struct rmnet_real_dev_info *real_dev_info;
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};
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static int rmnet_is_real_dev_registered(const struct net_device *real_dev)
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{
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rx_handler_func_t *rx_handler;
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rx_handler = rcu_dereference(real_dev->rx_handler);
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return (rx_handler == rmnet_rx_handler);
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}
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/* Needs either rcu_read_lock() or rtnl lock */
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static struct rmnet_real_dev_info*
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__rmnet_get_real_dev_info(const struct net_device *real_dev)
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{
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if (rmnet_is_real_dev_registered(real_dev))
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return rcu_dereference_rtnl(real_dev->rx_handler_data);
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else
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return NULL;
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}
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/* Needs rtnl lock */
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static struct rmnet_real_dev_info*
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rmnet_get_real_dev_info_rtnl(const struct net_device *real_dev)
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{
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return rtnl_dereference(real_dev->rx_handler_data);
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}
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static struct rmnet_endpoint*
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rmnet_get_endpoint(struct net_device *dev, int config_id)
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{
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struct rmnet_real_dev_info *r;
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struct rmnet_endpoint *ep;
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if (!rmnet_is_real_dev_registered(dev)) {
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ep = rmnet_vnd_get_endpoint(dev);
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} else {
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r = __rmnet_get_real_dev_info(dev);
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if (!r)
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return NULL;
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if (config_id == RMNET_LOCAL_LOGICAL_ENDPOINT)
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ep = &r->local_ep;
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else
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ep = &r->muxed_ep[config_id];
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}
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return ep;
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}
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static int rmnet_unregister_real_device(struct net_device *real_dev,
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struct rmnet_real_dev_info *r)
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{
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if (r->nr_rmnet_devs)
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return -EINVAL;
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kfree(r);
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netdev_rx_handler_unregister(real_dev);
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/* release reference on real_dev */
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dev_put(real_dev);
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netdev_dbg(real_dev, "Removed from rmnet\n");
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return 0;
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}
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static int rmnet_register_real_device(struct net_device *real_dev)
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{
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struct rmnet_real_dev_info *r;
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int rc;
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ASSERT_RTNL();
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if (rmnet_is_real_dev_registered(real_dev))
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return 0;
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r = kzalloc(sizeof(*r), GFP_ATOMIC);
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if (!r)
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return -ENOMEM;
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r->dev = real_dev;
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rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, r);
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if (rc) {
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kfree(r);
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return -EBUSY;
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}
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/* hold on to real dev for MAP data */
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dev_hold(real_dev);
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netdev_dbg(real_dev, "registered with rmnet\n");
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return 0;
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}
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static int rmnet_set_ingress_data_format(struct net_device *dev, u32 idf)
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{
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struct rmnet_real_dev_info *r;
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netdev_dbg(dev, "Ingress format 0x%08X\n", idf);
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r = __rmnet_get_real_dev_info(dev);
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r->ingress_data_format = idf;
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return 0;
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}
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static int rmnet_set_egress_data_format(struct net_device *dev, u32 edf,
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u16 agg_size, u16 agg_count)
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{
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struct rmnet_real_dev_info *r;
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netdev_dbg(dev, "Egress format 0x%08X agg size %d cnt %d\n",
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edf, agg_size, agg_count);
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r = __rmnet_get_real_dev_info(dev);
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r->egress_data_format = edf;
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return 0;
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}
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static int __rmnet_set_endpoint_config(struct net_device *dev, int config_id,
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struct rmnet_endpoint *ep)
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{
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struct rmnet_endpoint *dev_ep;
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dev_ep = rmnet_get_endpoint(dev, config_id);
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if (!dev_ep)
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return -EINVAL;
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memcpy(dev_ep, ep, sizeof(struct rmnet_endpoint));
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if (config_id == RMNET_LOCAL_LOGICAL_ENDPOINT)
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dev_ep->mux_id = 0;
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else
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dev_ep->mux_id = config_id;
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return 0;
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}
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static int rmnet_set_endpoint_config(struct net_device *dev,
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int config_id, u8 rmnet_mode,
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struct net_device *egress_dev)
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{
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struct rmnet_endpoint ep;
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netdev_dbg(dev, "id %d mode %d dev %s\n",
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config_id, rmnet_mode, egress_dev->name);
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if (config_id < RMNET_LOCAL_LOGICAL_ENDPOINT ||
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config_id >= RMNET_MAX_LOGICAL_EP)
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return -EINVAL;
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/* This config is cleared on every set, so its ok to not
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* clear it on a device delete.
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*/
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memset(&ep, 0, sizeof(struct rmnet_endpoint));
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ep.rmnet_mode = rmnet_mode;
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ep.egress_dev = egress_dev;
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return __rmnet_set_endpoint_config(dev, config_id, &ep);
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}
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static int rmnet_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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int ingress_format = RMNET_INGRESS_FORMAT_DEMUXING |
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RMNET_INGRESS_FORMAT_DEAGGREGATION |
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RMNET_INGRESS_FORMAT_MAP;
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int egress_format = RMNET_EGRESS_FORMAT_MUXING |
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RMNET_EGRESS_FORMAT_MAP;
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struct rmnet_real_dev_info *r;
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struct net_device *real_dev;
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int mode = RMNET_EPMODE_VND;
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int err = 0;
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u16 mux_id;
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real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
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if (!real_dev || !dev)
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return -ENODEV;
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if (!data[IFLA_VLAN_ID])
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return -EINVAL;
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mux_id = nla_get_u16(data[IFLA_VLAN_ID]);
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err = rmnet_register_real_device(real_dev);
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if (err)
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goto err0;
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r = rmnet_get_real_dev_info_rtnl(real_dev);
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err = rmnet_vnd_newlink(mux_id, dev, r);
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if (err)
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goto err1;
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err = netdev_master_upper_dev_link(dev, real_dev, NULL, NULL);
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if (err)
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goto err2;
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rmnet_vnd_set_mux(dev, mux_id);
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rmnet_set_egress_data_format(real_dev, egress_format, 0, 0);
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rmnet_set_ingress_data_format(real_dev, ingress_format);
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rmnet_set_endpoint_config(real_dev, mux_id, mode, dev);
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rmnet_set_endpoint_config(dev, mux_id, mode, real_dev);
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return 0;
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err2:
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rmnet_vnd_dellink(mux_id, r);
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err1:
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rmnet_unregister_real_device(real_dev, r);
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err0:
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return err;
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}
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static void rmnet_dellink(struct net_device *dev, struct list_head *head)
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{
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struct rmnet_real_dev_info *r;
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struct net_device *real_dev;
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u8 mux_id;
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rcu_read_lock();
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real_dev = netdev_master_upper_dev_get_rcu(dev);
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rcu_read_unlock();
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if (!real_dev || !rmnet_is_real_dev_registered(real_dev))
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return;
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r = rmnet_get_real_dev_info_rtnl(real_dev);
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mux_id = rmnet_vnd_get_mux(dev);
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rmnet_vnd_dellink(mux_id, r);
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netdev_upper_dev_unlink(dev, real_dev);
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rmnet_unregister_real_device(real_dev, r);
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unregister_netdevice_queue(dev, head);
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}
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static int rmnet_dev_walk_unreg(struct net_device *rmnet_dev, void *data)
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{
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struct rmnet_walk_data *d = data;
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u8 mux_id;
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mux_id = rmnet_vnd_get_mux(rmnet_dev);
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rmnet_vnd_dellink(mux_id, d->real_dev_info);
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netdev_upper_dev_unlink(rmnet_dev, d->real_dev);
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unregister_netdevice_queue(rmnet_dev, d->head);
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return 0;
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}
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static void rmnet_force_unassociate_device(struct net_device *dev)
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{
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struct net_device *real_dev = dev;
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struct rmnet_real_dev_info *r;
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struct rmnet_walk_data d;
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LIST_HEAD(list);
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if (!rmnet_is_real_dev_registered(real_dev))
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return;
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ASSERT_RTNL();
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d.real_dev = real_dev;
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d.head = &list;
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r = rmnet_get_real_dev_info_rtnl(dev);
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d.real_dev_info = r;
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rcu_read_lock();
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netdev_walk_all_lower_dev_rcu(real_dev, rmnet_dev_walk_unreg, &d);
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rcu_read_unlock();
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unregister_netdevice_many(&list);
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rmnet_unregister_real_device(real_dev, r);
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}
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static int rmnet_config_notify_cb(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(data);
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if (!dev)
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return NOTIFY_DONE;
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switch (event) {
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case NETDEV_UNREGISTER:
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netdev_dbg(dev, "Kernel unregister\n");
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rmnet_force_unassociate_device(dev);
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break;
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default:
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break;
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}
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return NOTIFY_DONE;
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}
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|
||||
static struct notifier_block rmnet_dev_notifier __read_mostly = {
|
||||
.notifier_call = rmnet_config_notify_cb,
|
||||
};
|
||||
|
||||
static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
u16 mux_id;
|
||||
|
||||
if (!data || !data[IFLA_VLAN_ID])
|
||||
return -EINVAL;
|
||||
|
||||
mux_id = nla_get_u16(data[IFLA_VLAN_ID]);
|
||||
if (mux_id > (RMNET_MAX_LOGICAL_EP - 1))
|
||||
return -ERANGE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static size_t rmnet_get_size(const struct net_device *dev)
|
||||
{
|
||||
return nla_total_size(2); /* IFLA_VLAN_ID */
|
||||
}
|
||||
|
||||
struct rtnl_link_ops rmnet_link_ops __read_mostly = {
|
||||
.kind = "rmnet",
|
||||
.maxtype = __IFLA_VLAN_MAX,
|
||||
.priv_size = sizeof(struct rmnet_priv),
|
||||
.setup = rmnet_vnd_setup,
|
||||
.validate = rmnet_rtnl_validate,
|
||||
.newlink = rmnet_newlink,
|
||||
.dellink = rmnet_dellink,
|
||||
.get_size = rmnet_get_size,
|
||||
};
|
||||
|
||||
struct rmnet_real_dev_info*
|
||||
rmnet_get_real_dev_info(struct net_device *real_dev)
|
||||
{
|
||||
return __rmnet_get_real_dev_info(real_dev);
|
||||
}
|
||||
|
||||
/* Startup/Shutdown */
|
||||
|
||||
static int __init rmnet_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = register_netdevice_notifier(&rmnet_dev_notifier);
|
||||
if (rc != 0)
|
||||
return rc;
|
||||
|
||||
rc = rtnl_link_register(&rmnet_link_ops);
|
||||
if (rc != 0) {
|
||||
unregister_netdevice_notifier(&rmnet_dev_notifier);
|
||||
return rc;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __exit rmnet_exit(void)
|
||||
{
|
||||
unregister_netdevice_notifier(&rmnet_dev_notifier);
|
||||
rtnl_link_unregister(&rmnet_link_ops);
|
||||
}
|
||||
|
||||
module_init(rmnet_init)
|
||||
module_exit(rmnet_exit)
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
/* Copyright (c) 2013-2014, 2016-2017 The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* RMNET Data configuration engine
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/skbuff.h>
|
||||
|
||||
#ifndef _RMNET_CONFIG_H_
|
||||
#define _RMNET_CONFIG_H_
|
||||
|
||||
#define RMNET_MAX_LOGICAL_EP 255
|
||||
#define RMNET_MAX_VND 32
|
||||
|
||||
/* Information about the next device to deliver the packet to.
|
||||
* Exact usage of this parameter depends on the rmnet_mode.
|
||||
*/
|
||||
struct rmnet_endpoint {
|
||||
u8 rmnet_mode;
|
||||
u8 mux_id;
|
||||
struct net_device *egress_dev;
|
||||
};
|
||||
|
||||
/* One instance of this structure is instantiated for each real_dev associated
|
||||
* with rmnet.
|
||||
*/
|
||||
struct rmnet_real_dev_info {
|
||||
struct net_device *dev;
|
||||
struct rmnet_endpoint local_ep;
|
||||
struct rmnet_endpoint muxed_ep[RMNET_MAX_LOGICAL_EP];
|
||||
u32 ingress_data_format;
|
||||
u32 egress_data_format;
|
||||
struct net_device *rmnet_devices[RMNET_MAX_VND];
|
||||
u8 nr_rmnet_devs;
|
||||
};
|
||||
|
||||
extern struct rtnl_link_ops rmnet_link_ops;
|
||||
|
||||
struct rmnet_priv {
|
||||
struct rmnet_endpoint local_ep;
|
||||
u8 mux_id;
|
||||
};
|
||||
|
||||
struct rmnet_real_dev_info*
|
||||
rmnet_get_real_dev_info(struct net_device *real_dev);
|
||||
|
||||
#endif /* _RMNET_CONFIG_H_ */
|
||||
|
|
@ -0,0 +1,271 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* RMNET Data ingress/egress handler
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/netdev_features.h>
|
||||
#include "rmnet_private.h"
|
||||
#include "rmnet_config.h"
|
||||
#include "rmnet_vnd.h"
|
||||
#include "rmnet_map.h"
|
||||
#include "rmnet_handlers.h"
|
||||
|
||||
#define RMNET_IP_VERSION_4 0x40
|
||||
#define RMNET_IP_VERSION_6 0x60
|
||||
|
||||
/* Helper Functions */
|
||||
|
||||
static void rmnet_set_skb_proto(struct sk_buff *skb)
|
||||
{
|
||||
switch (skb->data[0] & 0xF0) {
|
||||
case RMNET_IP_VERSION_4:
|
||||
skb->protocol = htons(ETH_P_IP);
|
||||
break;
|
||||
case RMNET_IP_VERSION_6:
|
||||
skb->protocol = htons(ETH_P_IPV6);
|
||||
break;
|
||||
default:
|
||||
skb->protocol = htons(ETH_P_MAP);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Generic handler */
|
||||
|
||||
static rx_handler_result_t
|
||||
rmnet_bridge_handler(struct sk_buff *skb, struct rmnet_endpoint *ep)
|
||||
{
|
||||
if (!ep->egress_dev)
|
||||
kfree_skb(skb);
|
||||
else
|
||||
rmnet_egress_handler(skb, ep);
|
||||
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
||||
static rx_handler_result_t
|
||||
rmnet_deliver_skb(struct sk_buff *skb, struct rmnet_endpoint *ep)
|
||||
{
|
||||
switch (ep->rmnet_mode) {
|
||||
case RMNET_EPMODE_NONE:
|
||||
return RX_HANDLER_PASS;
|
||||
|
||||
case RMNET_EPMODE_BRIDGE:
|
||||
return rmnet_bridge_handler(skb, ep);
|
||||
|
||||
case RMNET_EPMODE_VND:
|
||||
skb_reset_transport_header(skb);
|
||||
skb_reset_network_header(skb);
|
||||
rmnet_vnd_rx_fixup(skb, skb->dev);
|
||||
|
||||
skb->pkt_type = PACKET_HOST;
|
||||
skb_set_mac_header(skb, 0);
|
||||
netif_receive_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
|
||||
default:
|
||||
kfree_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
}
|
||||
|
||||
static rx_handler_result_t
|
||||
rmnet_ingress_deliver_packet(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *r)
|
||||
{
|
||||
if (!r) {
|
||||
kfree_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
||||
skb->dev = r->local_ep.egress_dev;
|
||||
|
||||
return rmnet_deliver_skb(skb, &r->local_ep);
|
||||
}
|
||||
|
||||
/* MAP handler */
|
||||
|
||||
static rx_handler_result_t
|
||||
__rmnet_map_ingress_handler(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *r)
|
||||
{
|
||||
struct rmnet_endpoint *ep;
|
||||
u8 mux_id;
|
||||
u16 len;
|
||||
|
||||
if (RMNET_MAP_GET_CD_BIT(skb)) {
|
||||
if (r->ingress_data_format
|
||||
& RMNET_INGRESS_FORMAT_MAP_COMMANDS)
|
||||
return rmnet_map_command(skb, r);
|
||||
|
||||
kfree_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
||||
mux_id = RMNET_MAP_GET_MUX_ID(skb);
|
||||
len = RMNET_MAP_GET_LENGTH(skb) - RMNET_MAP_GET_PAD(skb);
|
||||
|
||||
if (mux_id >= RMNET_MAX_LOGICAL_EP) {
|
||||
kfree_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
||||
ep = &r->muxed_ep[mux_id];
|
||||
|
||||
if (r->ingress_data_format & RMNET_INGRESS_FORMAT_DEMUXING)
|
||||
skb->dev = ep->egress_dev;
|
||||
|
||||
/* Subtract MAP header */
|
||||
skb_pull(skb, sizeof(struct rmnet_map_header));
|
||||
skb_trim(skb, len);
|
||||
rmnet_set_skb_proto(skb);
|
||||
return rmnet_deliver_skb(skb, ep);
|
||||
}
|
||||
|
||||
static rx_handler_result_t
|
||||
rmnet_map_ingress_handler(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *r)
|
||||
{
|
||||
struct sk_buff *skbn;
|
||||
int rc;
|
||||
|
||||
if (r->ingress_data_format & RMNET_INGRESS_FORMAT_DEAGGREGATION) {
|
||||
while ((skbn = rmnet_map_deaggregate(skb, r)) != NULL)
|
||||
__rmnet_map_ingress_handler(skbn, r);
|
||||
|
||||
consume_skb(skb);
|
||||
rc = RX_HANDLER_CONSUMED;
|
||||
} else {
|
||||
rc = __rmnet_map_ingress_handler(skb, r);
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int rmnet_map_egress_handler(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *r,
|
||||
struct rmnet_endpoint *ep,
|
||||
struct net_device *orig_dev)
|
||||
{
|
||||
int required_headroom, additional_header_len;
|
||||
struct rmnet_map_header *map_header;
|
||||
|
||||
additional_header_len = 0;
|
||||
required_headroom = sizeof(struct rmnet_map_header);
|
||||
|
||||
if (skb_headroom(skb) < required_headroom) {
|
||||
if (pskb_expand_head(skb, required_headroom, 0, GFP_KERNEL))
|
||||
return RMNET_MAP_CONSUMED;
|
||||
}
|
||||
|
||||
map_header = rmnet_map_add_map_header(skb, additional_header_len, 0);
|
||||
if (!map_header)
|
||||
return RMNET_MAP_CONSUMED;
|
||||
|
||||
if (r->egress_data_format & RMNET_EGRESS_FORMAT_MUXING) {
|
||||
if (ep->mux_id == 0xff)
|
||||
map_header->mux_id = 0;
|
||||
else
|
||||
map_header->mux_id = ep->mux_id;
|
||||
}
|
||||
|
||||
skb->protocol = htons(ETH_P_MAP);
|
||||
|
||||
return RMNET_MAP_SUCCESS;
|
||||
}
|
||||
|
||||
/* Ingress / Egress Entry Points */
|
||||
|
||||
/* Processes packet as per ingress data format for receiving device. Logical
|
||||
* endpoint is determined from packet inspection. Packet is then sent to the
|
||||
* egress device listed in the logical endpoint configuration.
|
||||
*/
|
||||
rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
|
||||
{
|
||||
struct rmnet_real_dev_info *r;
|
||||
struct sk_buff *skb = *pskb;
|
||||
struct net_device *dev;
|
||||
int rc;
|
||||
|
||||
if (!skb)
|
||||
return RX_HANDLER_CONSUMED;
|
||||
|
||||
dev = skb->dev;
|
||||
r = rmnet_get_real_dev_info(dev);
|
||||
|
||||
if (r->ingress_data_format & RMNET_INGRESS_FORMAT_MAP) {
|
||||
rc = rmnet_map_ingress_handler(skb, r);
|
||||
} else {
|
||||
switch (ntohs(skb->protocol)) {
|
||||
case ETH_P_MAP:
|
||||
if (r->local_ep.rmnet_mode ==
|
||||
RMNET_EPMODE_BRIDGE) {
|
||||
rc = rmnet_ingress_deliver_packet(skb, r);
|
||||
} else {
|
||||
kfree_skb(skb);
|
||||
rc = RX_HANDLER_CONSUMED;
|
||||
}
|
||||
break;
|
||||
|
||||
case ETH_P_IP:
|
||||
case ETH_P_IPV6:
|
||||
rc = rmnet_ingress_deliver_packet(skb, r);
|
||||
break;
|
||||
|
||||
default:
|
||||
rc = RX_HANDLER_PASS;
|
||||
}
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Modifies packet as per logical endpoint configuration and egress data format
|
||||
* for egress device configured in logical endpoint. Packet is then transmitted
|
||||
* on the egress device.
|
||||
*/
|
||||
void rmnet_egress_handler(struct sk_buff *skb,
|
||||
struct rmnet_endpoint *ep)
|
||||
{
|
||||
struct rmnet_real_dev_info *r;
|
||||
struct net_device *orig_dev;
|
||||
|
||||
orig_dev = skb->dev;
|
||||
skb->dev = ep->egress_dev;
|
||||
|
||||
r = rmnet_get_real_dev_info(skb->dev);
|
||||
if (!r) {
|
||||
kfree_skb(skb);
|
||||
return;
|
||||
}
|
||||
|
||||
if (r->egress_data_format & RMNET_EGRESS_FORMAT_MAP) {
|
||||
switch (rmnet_map_egress_handler(skb, r, ep, orig_dev)) {
|
||||
case RMNET_MAP_CONSUMED:
|
||||
return;
|
||||
|
||||
case RMNET_MAP_SUCCESS:
|
||||
break;
|
||||
|
||||
default:
|
||||
kfree_skb(skb);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
if (ep->rmnet_mode == RMNET_EPMODE_VND)
|
||||
rmnet_vnd_tx_fixup(skb, orig_dev);
|
||||
|
||||
dev_queue_xmit(skb);
|
||||
}
|
||||
|
|
@ -0,0 +1,26 @@
|
|||
/* Copyright (c) 2013, 2016-2017 The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* RMNET Data ingress/egress handler
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _RMNET_HANDLERS_H_
|
||||
#define _RMNET_HANDLERS_H_
|
||||
|
||||
#include "rmnet_config.h"
|
||||
|
||||
void rmnet_egress_handler(struct sk_buff *skb,
|
||||
struct rmnet_endpoint *ep);
|
||||
|
||||
rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb);
|
||||
|
||||
#endif /* _RMNET_HANDLERS_H_ */
|
||||
|
|
@ -0,0 +1,88 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#ifndef _RMNET_MAP_H_
|
||||
#define _RMNET_MAP_H_
|
||||
|
||||
struct rmnet_map_control_command {
|
||||
u8 command_name;
|
||||
u8 cmd_type:2;
|
||||
u8 reserved:6;
|
||||
u16 reserved2;
|
||||
u32 transaction_id;
|
||||
union {
|
||||
struct {
|
||||
u16 ip_family:2;
|
||||
u16 reserved:14;
|
||||
u16 flow_control_seq_num;
|
||||
u32 qos_id;
|
||||
} flow_control;
|
||||
u8 data[0];
|
||||
};
|
||||
} __aligned(1);
|
||||
|
||||
enum rmnet_map_results {
|
||||
RMNET_MAP_SUCCESS,
|
||||
RMNET_MAP_CONSUMED,
|
||||
RMNET_MAP_GENERAL_FAILURE,
|
||||
RMNET_MAP_NOT_ENABLED,
|
||||
RMNET_MAP_FAILED_AGGREGATION,
|
||||
RMNET_MAP_FAILED_MUX
|
||||
};
|
||||
|
||||
enum rmnet_map_commands {
|
||||
RMNET_MAP_COMMAND_NONE,
|
||||
RMNET_MAP_COMMAND_FLOW_DISABLE,
|
||||
RMNET_MAP_COMMAND_FLOW_ENABLE,
|
||||
/* These should always be the last 2 elements */
|
||||
RMNET_MAP_COMMAND_UNKNOWN,
|
||||
RMNET_MAP_COMMAND_ENUM_LENGTH
|
||||
};
|
||||
|
||||
struct rmnet_map_header {
|
||||
u8 pad_len:6;
|
||||
u8 reserved_bit:1;
|
||||
u8 cd_bit:1;
|
||||
u8 mux_id;
|
||||
u16 pkt_len;
|
||||
} __aligned(1);
|
||||
|
||||
#define RMNET_MAP_GET_MUX_ID(Y) (((struct rmnet_map_header *) \
|
||||
(Y)->data)->mux_id)
|
||||
#define RMNET_MAP_GET_CD_BIT(Y) (((struct rmnet_map_header *) \
|
||||
(Y)->data)->cd_bit)
|
||||
#define RMNET_MAP_GET_PAD(Y) (((struct rmnet_map_header *) \
|
||||
(Y)->data)->pad_len)
|
||||
#define RMNET_MAP_GET_CMD_START(Y) ((struct rmnet_map_control_command *) \
|
||||
((Y)->data + \
|
||||
sizeof(struct rmnet_map_header)))
|
||||
#define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
|
||||
(Y)->data)->pkt_len))
|
||||
|
||||
#define RMNET_MAP_COMMAND_REQUEST 0
|
||||
#define RMNET_MAP_COMMAND_ACK 1
|
||||
#define RMNET_MAP_COMMAND_UNSUPPORTED 2
|
||||
#define RMNET_MAP_COMMAND_INVALID 3
|
||||
|
||||
#define RMNET_MAP_NO_PAD_BYTES 0
|
||||
#define RMNET_MAP_ADD_PAD_BYTES 1
|
||||
|
||||
u8 rmnet_map_demultiplex(struct sk_buff *skb);
|
||||
struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *rdinfo);
|
||||
|
||||
struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
|
||||
int hdrlen, int pad);
|
||||
rx_handler_result_t rmnet_map_command(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *rdinfo);
|
||||
|
||||
#endif /* _RMNET_MAP_H_ */
|
||||
|
|
@ -0,0 +1,107 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#include <linux/netdevice.h>
|
||||
#include "rmnet_config.h"
|
||||
#include "rmnet_map.h"
|
||||
#include "rmnet_private.h"
|
||||
#include "rmnet_vnd.h"
|
||||
|
||||
static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *rdinfo,
|
||||
int enable)
|
||||
{
|
||||
struct rmnet_map_control_command *cmd;
|
||||
struct rmnet_endpoint *ep;
|
||||
struct net_device *vnd;
|
||||
u16 ip_family;
|
||||
u16 fc_seq;
|
||||
u32 qos_id;
|
||||
u8 mux_id;
|
||||
int r;
|
||||
|
||||
mux_id = RMNET_MAP_GET_MUX_ID(skb);
|
||||
cmd = RMNET_MAP_GET_CMD_START(skb);
|
||||
|
||||
if (mux_id >= RMNET_MAX_LOGICAL_EP) {
|
||||
kfree_skb(skb);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
||||
ep = &rdinfo->muxed_ep[mux_id];
|
||||
vnd = ep->egress_dev;
|
||||
|
||||
ip_family = cmd->flow_control.ip_family;
|
||||
fc_seq = ntohs(cmd->flow_control.flow_control_seq_num);
|
||||
qos_id = ntohl(cmd->flow_control.qos_id);
|
||||
|
||||
/* Ignore the ip family and pass the sequence number for both v4 and v6
|
||||
* sequence. User space does not support creating dedicated flows for
|
||||
* the 2 protocols
|
||||
*/
|
||||
r = rmnet_vnd_do_flow_control(vnd, enable);
|
||||
if (r) {
|
||||
kfree_skb(skb);
|
||||
return RMNET_MAP_COMMAND_UNSUPPORTED;
|
||||
} else {
|
||||
return RMNET_MAP_COMMAND_ACK;
|
||||
}
|
||||
}
|
||||
|
||||
static void rmnet_map_send_ack(struct sk_buff *skb,
|
||||
unsigned char type,
|
||||
struct rmnet_real_dev_info *rdinfo)
|
||||
{
|
||||
struct rmnet_map_control_command *cmd;
|
||||
int xmit_status;
|
||||
|
||||
skb->protocol = htons(ETH_P_MAP);
|
||||
|
||||
cmd = RMNET_MAP_GET_CMD_START(skb);
|
||||
cmd->cmd_type = type & 0x03;
|
||||
|
||||
netif_tx_lock(skb->dev);
|
||||
xmit_status = skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
|
||||
netif_tx_unlock(skb->dev);
|
||||
}
|
||||
|
||||
/* Process MAP command frame and send N/ACK message as appropriate. Message cmd
|
||||
* name is decoded here and appropriate handler is called.
|
||||
*/
|
||||
rx_handler_result_t rmnet_map_command(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *rdinfo)
|
||||
{
|
||||
struct rmnet_map_control_command *cmd;
|
||||
unsigned char command_name;
|
||||
unsigned char rc = 0;
|
||||
|
||||
cmd = RMNET_MAP_GET_CMD_START(skb);
|
||||
command_name = cmd->command_name;
|
||||
|
||||
switch (command_name) {
|
||||
case RMNET_MAP_COMMAND_FLOW_ENABLE:
|
||||
rc = rmnet_map_do_flow_control(skb, rdinfo, 1);
|
||||
break;
|
||||
|
||||
case RMNET_MAP_COMMAND_FLOW_DISABLE:
|
||||
rc = rmnet_map_do_flow_control(skb, rdinfo, 0);
|
||||
break;
|
||||
|
||||
default:
|
||||
rc = RMNET_MAP_COMMAND_UNSUPPORTED;
|
||||
kfree_skb(skb);
|
||||
break;
|
||||
}
|
||||
if (rc == RMNET_MAP_COMMAND_ACK)
|
||||
rmnet_map_send_ack(skb, rc, rdinfo);
|
||||
return RX_HANDLER_CONSUMED;
|
||||
}
|
||||
|
|
@ -0,0 +1,105 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* RMNET Data MAP protocol
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/netdevice.h>
|
||||
#include "rmnet_config.h"
|
||||
#include "rmnet_map.h"
|
||||
#include "rmnet_private.h"
|
||||
|
||||
#define RMNET_MAP_DEAGGR_SPACING 64
|
||||
#define RMNET_MAP_DEAGGR_HEADROOM (RMNET_MAP_DEAGGR_SPACING / 2)
|
||||
|
||||
/* Adds MAP header to front of skb->data
|
||||
* Padding is calculated and set appropriately in MAP header. Mux ID is
|
||||
* initialized to 0.
|
||||
*/
|
||||
struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
|
||||
int hdrlen, int pad)
|
||||
{
|
||||
struct rmnet_map_header *map_header;
|
||||
u32 padding, map_datalen;
|
||||
u8 *padbytes;
|
||||
|
||||
if (skb_headroom(skb) < sizeof(struct rmnet_map_header))
|
||||
return NULL;
|
||||
|
||||
map_datalen = skb->len - hdrlen;
|
||||
map_header = (struct rmnet_map_header *)
|
||||
skb_push(skb, sizeof(struct rmnet_map_header));
|
||||
memset(map_header, 0, sizeof(struct rmnet_map_header));
|
||||
|
||||
if (pad == RMNET_MAP_NO_PAD_BYTES) {
|
||||
map_header->pkt_len = htons(map_datalen);
|
||||
return map_header;
|
||||
}
|
||||
|
||||
padding = ALIGN(map_datalen, 4) - map_datalen;
|
||||
|
||||
if (padding == 0)
|
||||
goto done;
|
||||
|
||||
if (skb_tailroom(skb) < padding)
|
||||
return NULL;
|
||||
|
||||
padbytes = (u8 *)skb_put(skb, padding);
|
||||
memset(padbytes, 0, padding);
|
||||
|
||||
done:
|
||||
map_header->pkt_len = htons(map_datalen + padding);
|
||||
map_header->pad_len = padding & 0x3F;
|
||||
|
||||
return map_header;
|
||||
}
|
||||
|
||||
/* Deaggregates a single packet
|
||||
* A whole new buffer is allocated for each portion of an aggregated frame.
|
||||
* Caller should keep calling deaggregate() on the source skb until 0 is
|
||||
* returned, indicating that there are no more packets to deaggregate. Caller
|
||||
* is responsible for freeing the original skb.
|
||||
*/
|
||||
struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
|
||||
struct rmnet_real_dev_info *rdinfo)
|
||||
{
|
||||
struct rmnet_map_header *maph;
|
||||
struct sk_buff *skbn;
|
||||
u32 packet_len;
|
||||
|
||||
if (skb->len == 0)
|
||||
return NULL;
|
||||
|
||||
maph = (struct rmnet_map_header *)skb->data;
|
||||
packet_len = ntohs(maph->pkt_len) + sizeof(struct rmnet_map_header);
|
||||
|
||||
if (((int)skb->len - (int)packet_len) < 0)
|
||||
return NULL;
|
||||
|
||||
skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC);
|
||||
if (!skbn)
|
||||
return NULL;
|
||||
|
||||
skbn->dev = skb->dev;
|
||||
skb_reserve(skbn, RMNET_MAP_DEAGGR_HEADROOM);
|
||||
skb_put(skbn, packet_len);
|
||||
memcpy(skbn->data, skb->data, packet_len);
|
||||
skb_pull(skb, packet_len);
|
||||
|
||||
/* Some hardware can send us empty frames. Catch them */
|
||||
if (ntohs(maph->pkt_len) == 0) {
|
||||
kfree_skb(skb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return skbn;
|
||||
}
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
/* Copyright (c) 2013-2014, 2016-2017 The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#ifndef _RMNET_PRIVATE_H_
|
||||
#define _RMNET_PRIVATE_H_
|
||||
|
||||
#define RMNET_MAX_VND 32
|
||||
#define RMNET_MAX_PACKET_SIZE 16384
|
||||
#define RMNET_DFLT_PACKET_SIZE 1500
|
||||
#define RMNET_NEEDED_HEADROOM 16
|
||||
#define RMNET_TX_QUEUE_LEN 1000
|
||||
|
||||
/* Constants */
|
||||
#define RMNET_EGRESS_FORMAT__RESERVED__ BIT(0)
|
||||
#define RMNET_EGRESS_FORMAT_MAP BIT(1)
|
||||
#define RMNET_EGRESS_FORMAT_AGGREGATION BIT(2)
|
||||
#define RMNET_EGRESS_FORMAT_MUXING BIT(3)
|
||||
#define RMNET_EGRESS_FORMAT_MAP_CKSUMV3 BIT(4)
|
||||
#define RMNET_EGRESS_FORMAT_MAP_CKSUMV4 BIT(5)
|
||||
|
||||
#define RMNET_INGRESS_FIX_ETHERNET BIT(0)
|
||||
#define RMNET_INGRESS_FORMAT_MAP BIT(1)
|
||||
#define RMNET_INGRESS_FORMAT_DEAGGREGATION BIT(2)
|
||||
#define RMNET_INGRESS_FORMAT_DEMUXING BIT(3)
|
||||
#define RMNET_INGRESS_FORMAT_MAP_COMMANDS BIT(4)
|
||||
#define RMNET_INGRESS_FORMAT_MAP_CKSUMV3 BIT(5)
|
||||
#define RMNET_INGRESS_FORMAT_MAP_CKSUMV4 BIT(6)
|
||||
|
||||
/* Pass the frame up the stack with no modifications to skb->dev */
|
||||
#define RMNET_EPMODE_NONE (0)
|
||||
/* Replace skb->dev to a virtual rmnet device and pass up the stack */
|
||||
#define RMNET_EPMODE_VND (1)
|
||||
/* Pass the frame directly to another device with dev_queue_xmit() */
|
||||
#define RMNET_EPMODE_BRIDGE (2)
|
||||
|
||||
#endif /* _RMNET_PRIVATE_H_ */
|
||||
|
|
@ -0,0 +1,170 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
*
|
||||
* RMNET Data virtual network driver
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/etherdevice.h>
|
||||
#include <linux/if_arp.h>
|
||||
#include <net/pkt_sched.h>
|
||||
#include "rmnet_config.h"
|
||||
#include "rmnet_handlers.h"
|
||||
#include "rmnet_private.h"
|
||||
#include "rmnet_map.h"
|
||||
#include "rmnet_vnd.h"
|
||||
|
||||
/* RX/TX Fixup */
|
||||
|
||||
void rmnet_vnd_rx_fixup(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
dev->stats.rx_packets++;
|
||||
dev->stats.rx_bytes += skb->len;
|
||||
}
|
||||
|
||||
void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
dev->stats.tx_packets++;
|
||||
dev->stats.tx_bytes += skb->len;
|
||||
}
|
||||
|
||||
/* Network Device Operations */
|
||||
|
||||
static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
|
||||
struct net_device *dev)
|
||||
{
|
||||
struct rmnet_priv *priv;
|
||||
|
||||
priv = netdev_priv(dev);
|
||||
if (priv->local_ep.egress_dev) {
|
||||
rmnet_egress_handler(skb, &priv->local_ep);
|
||||
} else {
|
||||
dev->stats.tx_dropped++;
|
||||
kfree_skb(skb);
|
||||
}
|
||||
return NETDEV_TX_OK;
|
||||
}
|
||||
|
||||
static int rmnet_vnd_change_mtu(struct net_device *rmnet_dev, int new_mtu)
|
||||
{
|
||||
if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE)
|
||||
return -EINVAL;
|
||||
|
||||
rmnet_dev->mtu = new_mtu;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct net_device_ops rmnet_vnd_ops = {
|
||||
.ndo_start_xmit = rmnet_vnd_start_xmit,
|
||||
.ndo_change_mtu = rmnet_vnd_change_mtu,
|
||||
};
|
||||
|
||||
/* Called by kernel whenever a new rmnet<n> device is created. Sets MTU,
|
||||
* flags, ARP type, needed headroom, etc...
|
||||
*/
|
||||
void rmnet_vnd_setup(struct net_device *rmnet_dev)
|
||||
{
|
||||
struct rmnet_priv *priv;
|
||||
|
||||
priv = netdev_priv(rmnet_dev);
|
||||
netdev_dbg(rmnet_dev, "Setting up device %s\n", rmnet_dev->name);
|
||||
|
||||
rmnet_dev->netdev_ops = &rmnet_vnd_ops;
|
||||
rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE;
|
||||
rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM;
|
||||
random_ether_addr(rmnet_dev->dev_addr);
|
||||
rmnet_dev->tx_queue_len = RMNET_TX_QUEUE_LEN;
|
||||
|
||||
/* Raw IP mode */
|
||||
rmnet_dev->header_ops = NULL; /* No header */
|
||||
rmnet_dev->type = ARPHRD_RAWIP;
|
||||
rmnet_dev->hard_header_len = 0;
|
||||
rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
|
||||
|
||||
rmnet_dev->needs_free_netdev = true;
|
||||
}
|
||||
|
||||
/* Exposed API */
|
||||
|
||||
int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
|
||||
struct rmnet_real_dev_info *r)
|
||||
{
|
||||
int rc;
|
||||
|
||||
if (r->rmnet_devices[id])
|
||||
return -EINVAL;
|
||||
|
||||
rc = register_netdevice(rmnet_dev);
|
||||
if (!rc) {
|
||||
r->rmnet_devices[id] = rmnet_dev;
|
||||
r->nr_rmnet_devs++;
|
||||
rmnet_dev->rtnl_link_ops = &rmnet_link_ops;
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int rmnet_vnd_dellink(u8 id, struct rmnet_real_dev_info *r)
|
||||
{
|
||||
if (id >= RMNET_MAX_VND || !r->rmnet_devices[id])
|
||||
return -EINVAL;
|
||||
|
||||
r->rmnet_devices[id] = NULL;
|
||||
r->nr_rmnet_devs--;
|
||||
return 0;
|
||||
}
|
||||
|
||||
u8 rmnet_vnd_get_mux(struct net_device *rmnet_dev)
|
||||
{
|
||||
struct rmnet_priv *priv;
|
||||
|
||||
priv = netdev_priv(rmnet_dev);
|
||||
return priv->mux_id;
|
||||
}
|
||||
|
||||
void rmnet_vnd_set_mux(struct net_device *rmnet_dev, u8 mux_id)
|
||||
{
|
||||
struct rmnet_priv *priv;
|
||||
|
||||
priv = netdev_priv(rmnet_dev);
|
||||
priv->mux_id = mux_id;
|
||||
}
|
||||
|
||||
/* Gets the logical endpoint configuration for a RmNet virtual network device
|
||||
* node. Caller should confirm that devices is a RmNet VND before calling.
|
||||
*/
|
||||
struct rmnet_endpoint *rmnet_vnd_get_endpoint(struct net_device *rmnet_dev)
|
||||
{
|
||||
struct rmnet_priv *priv;
|
||||
|
||||
if (!rmnet_dev)
|
||||
return NULL;
|
||||
|
||||
priv = netdev_priv(rmnet_dev);
|
||||
|
||||
return &priv->local_ep;
|
||||
}
|
||||
|
||||
int rmnet_vnd_do_flow_control(struct net_device *rmnet_dev, int enable)
|
||||
{
|
||||
netdev_dbg(rmnet_dev, "Setting VND TX queue state to %d\n", enable);
|
||||
/* Although we expect similar number of enable/disable
|
||||
* commands, optimize for the disable. That is more
|
||||
* latency sensitive than enable
|
||||
*/
|
||||
if (unlikely(enable))
|
||||
netif_wake_queue(rmnet_dev);
|
||||
else
|
||||
netif_stop_queue(rmnet_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 and
|
||||
* only version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* RMNET Data Virtual Network Device APIs
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _RMNET_VND_H_
|
||||
#define _RMNET_VND_H_
|
||||
|
||||
int rmnet_vnd_do_flow_control(struct net_device *dev, int enable);
|
||||
struct rmnet_endpoint *rmnet_vnd_get_endpoint(struct net_device *dev);
|
||||
int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
|
||||
struct rmnet_real_dev_info *r);
|
||||
int rmnet_vnd_dellink(u8 id, struct rmnet_real_dev_info *r);
|
||||
void rmnet_vnd_rx_fixup(struct sk_buff *skb, struct net_device *dev);
|
||||
void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev);
|
||||
u8 rmnet_vnd_get_mux(struct net_device *rmnet_dev);
|
||||
void rmnet_vnd_set_mux(struct net_device *rmnet_dev, u8 mux_id);
|
||||
void rmnet_vnd_setup(struct net_device *dev);
|
||||
#endif /* _RMNET_VND_H_ */
|
||||
Loading…
Reference in New Issue