diff options
Diffstat (limited to 'drivers/net/ethernet/qualcomm/rmnet')
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/Makefile | 10 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 499 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h | 85 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 252 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.h | 25 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 95 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c | 114 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 439 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h | 26 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c | 292 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.h | 29 |
12 files changed, 1879 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/Kconfig b/drivers/net/ethernet/qualcomm/rmnet/Kconfig new file mode 100644 index 000000000..9bb06d284 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/Kconfig @@ -0,0 +1,13 @@ +# +# RMNET MAP driver +# + +menuconfig RMNET + tristate "RmNet MAP driver" + default n + select GRO_CELLS + ---help--- + If you select this, you will enable the RMNET module which is used + for handling data in the multiplexing and aggregation protocol (MAP) + format in the embedded data path. RMNET devices can be attached to + any IP mode physical device. diff --git a/drivers/net/ethernet/qualcomm/rmnet/Makefile b/drivers/net/ethernet/qualcomm/rmnet/Makefile new file mode 100644 index 000000000..01bddf207 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for the RMNET module +# + +rmnet-y := rmnet_config.o +rmnet-y += rmnet_vnd.o +rmnet-y += rmnet_handlers.o +rmnet-y += rmnet_map_data.o +rmnet-y += rmnet_map_command.o +obj-$(CONFIG_RMNET) += rmnet.o diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c new file mode 100644 index 000000000..05c438f47 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -0,0 +1,499 @@ +/* Copyright (c) 2013-2018, 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 configuration engine + * + */ + +#include <net/sock.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netdevice.h> +#include "rmnet_config.h" +#include "rmnet_handlers.h" +#include "rmnet_vnd.h" +#include "rmnet_private.h" + +/* Local Definitions and Declarations */ + +static const struct nla_policy rmnet_policy[IFLA_RMNET_MAX + 1] = { + [IFLA_RMNET_MUX_ID] = { .type = NLA_U16 }, + [IFLA_RMNET_FLAGS] = { .len = sizeof(struct ifla_rmnet_flags) }, +}; + +static int rmnet_is_real_dev_registered(const struct net_device *real_dev) +{ + return rcu_access_pointer(real_dev->rx_handler) == rmnet_rx_handler; +} + +/* Needs rtnl lock */ +static struct rmnet_port* +rmnet_get_port_rtnl(const struct net_device *real_dev) +{ + return rtnl_dereference(real_dev->rx_handler_data); +} + +static int rmnet_unregister_real_device(struct net_device *real_dev) +{ + struct rmnet_port *port = rmnet_get_port_rtnl(real_dev); + + if (port->nr_rmnet_devs) + return -EINVAL; + + netdev_rx_handler_unregister(real_dev); + + kfree(port); + + netdev_dbg(real_dev, "Removed from rmnet\n"); + return 0; +} + +static int rmnet_register_real_device(struct net_device *real_dev, + struct netlink_ext_ack *extack) +{ + struct rmnet_port *port; + int rc, entry; + + ASSERT_RTNL(); + + if (rmnet_is_real_dev_registered(real_dev)) { + port = rmnet_get_port_rtnl(real_dev); + if (port->rmnet_mode != RMNET_EPMODE_VND) { + NL_SET_ERR_MSG_MOD(extack, "bridge device already exists"); + return -EINVAL; + } + + return 0; + } + + port = kzalloc(sizeof(*port), GFP_ATOMIC); + if (!port) + return -ENOMEM; + + port->dev = real_dev; + rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, port); + if (rc) { + kfree(port); + return -EBUSY; + } + + for (entry = 0; entry < RMNET_MAX_LOGICAL_EP; entry++) + INIT_HLIST_HEAD(&port->muxed_ep[entry]); + + netdev_dbg(real_dev, "registered with rmnet\n"); + return 0; +} + +static void rmnet_unregister_bridge(struct rmnet_port *port) +{ + struct net_device *bridge_dev, *real_dev, *rmnet_dev; + struct rmnet_port *real_port; + + if (port->rmnet_mode != RMNET_EPMODE_BRIDGE) + return; + + rmnet_dev = port->rmnet_dev; + if (!port->nr_rmnet_devs) { + /* bridge device */ + real_dev = port->bridge_ep; + bridge_dev = port->dev; + + real_port = rmnet_get_port_rtnl(real_dev); + real_port->bridge_ep = NULL; + real_port->rmnet_mode = RMNET_EPMODE_VND; + } else { + /* real device */ + bridge_dev = port->bridge_ep; + + port->bridge_ep = NULL; + port->rmnet_mode = RMNET_EPMODE_VND; + } + + netdev_upper_dev_unlink(bridge_dev, rmnet_dev); + rmnet_unregister_real_device(bridge_dev); +} + +static int rmnet_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION; + struct net_device *real_dev; + int mode = RMNET_EPMODE_VND; + struct rmnet_endpoint *ep; + struct rmnet_port *port; + int err = 0; + u16 mux_id; + + if (!tb[IFLA_LINK]) { + NL_SET_ERR_MSG_MOD(extack, "link not specified"); + return -EINVAL; + } + + real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + if (!real_dev || !dev) + return -ENODEV; + + if (!data[IFLA_RMNET_MUX_ID]) + return -EINVAL; + + ep = kzalloc(sizeof(*ep), GFP_ATOMIC); + if (!ep) + return -ENOMEM; + + mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); + + err = rmnet_register_real_device(real_dev, extack); + if (err) + goto err0; + + port = rmnet_get_port_rtnl(real_dev); + err = rmnet_vnd_newlink(mux_id, dev, port, real_dev, ep); + if (err) + goto err1; + + err = netdev_upper_dev_link(real_dev, dev, extack); + if (err < 0) + goto err2; + + port->rmnet_mode = mode; + port->rmnet_dev = dev; + + hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]); + + if (data[IFLA_RMNET_FLAGS]) { + struct ifla_rmnet_flags *flags; + + flags = nla_data(data[IFLA_RMNET_FLAGS]); + data_format = flags->flags & flags->mask; + } + + netdev_dbg(dev, "data format [0x%08X]\n", data_format); + port->data_format = data_format; + + return 0; + +err2: + unregister_netdevice(dev); + rmnet_vnd_dellink(mux_id, port, ep); +err1: + rmnet_unregister_real_device(real_dev); +err0: + kfree(ep); + return err; +} + +static void rmnet_dellink(struct net_device *dev, struct list_head *head) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct net_device *real_dev, *bridge_dev; + struct rmnet_port *real_port, *bridge_port; + struct rmnet_endpoint *ep; + u8 mux_id = priv->mux_id; + + real_dev = priv->real_dev; + + if (!rmnet_is_real_dev_registered(real_dev)) + return; + + real_port = rmnet_get_port_rtnl(real_dev); + bridge_dev = real_port->bridge_ep; + if (bridge_dev) { + bridge_port = rmnet_get_port_rtnl(bridge_dev); + rmnet_unregister_bridge(bridge_port); + } + + ep = rmnet_get_endpoint(real_port, mux_id); + if (ep) { + hlist_del_init_rcu(&ep->hlnode); + rmnet_vnd_dellink(mux_id, real_port, ep); + kfree(ep); + } + + netdev_upper_dev_unlink(real_dev, dev); + rmnet_unregister_real_device(real_dev); + unregister_netdevice_queue(dev, head); +} + +static void rmnet_force_unassociate_device(struct net_device *real_dev) +{ + struct hlist_node *tmp_ep; + struct rmnet_endpoint *ep; + struct rmnet_port *port; + unsigned long bkt_ep; + LIST_HEAD(list); + + port = rmnet_get_port_rtnl(real_dev); + + if (port->nr_rmnet_devs) { + /* real device */ + rmnet_unregister_bridge(port); + hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) { + unregister_netdevice_queue(ep->egress_dev, &list); + netdev_upper_dev_unlink(real_dev, ep->egress_dev); + rmnet_vnd_dellink(ep->mux_id, port, ep); + hlist_del_init_rcu(&ep->hlnode); + kfree(ep); + } + rmnet_unregister_real_device(real_dev); + unregister_netdevice_many(&list); + } else { + rmnet_unregister_bridge(port); + } +} + +static int rmnet_config_notify_cb(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct net_device *real_dev = netdev_notifier_info_to_dev(data); + + if (!rmnet_is_real_dev_registered(real_dev)) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_UNREGISTER: + netdev_dbg(real_dev, "Kernel unregister\n"); + rmnet_force_unassociate_device(real_dev); + break; + + default: + break; + } + + return NOTIFY_DONE; +} + +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_RMNET_MUX_ID]) + return -EINVAL; + + mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); + if (mux_id > (RMNET_MAX_LOGICAL_EP - 1)) + return -ERANGE; + + return 0; +} + +static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[], + struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct net_device *real_dev; + struct rmnet_port *port; + u16 mux_id; + + if (!dev) + return -ENODEV; + + real_dev = priv->real_dev; + if (!rmnet_is_real_dev_registered(real_dev)) + return -ENODEV; + + port = rmnet_get_port_rtnl(real_dev); + + if (data[IFLA_RMNET_MUX_ID]) { + mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); + + if (mux_id != priv->mux_id) { + struct rmnet_endpoint *ep; + + ep = rmnet_get_endpoint(port, priv->mux_id); + if (!ep) + return -ENODEV; + + if (rmnet_get_endpoint(port, mux_id)) { + NL_SET_ERR_MSG_MOD(extack, + "MUX ID already exists"); + return -EINVAL; + } + + hlist_del_init_rcu(&ep->hlnode); + hlist_add_head_rcu(&ep->hlnode, + &port->muxed_ep[mux_id]); + + ep->mux_id = mux_id; + priv->mux_id = mux_id; + } + } + + if (data[IFLA_RMNET_FLAGS]) { + struct ifla_rmnet_flags *flags; + + flags = nla_data(data[IFLA_RMNET_FLAGS]); + port->data_format = flags->flags & flags->mask; + } + + return 0; +} + +static size_t rmnet_get_size(const struct net_device *dev) +{ + return + /* IFLA_RMNET_MUX_ID */ + nla_total_size(2) + + /* IFLA_RMNET_FLAGS */ + nla_total_size(sizeof(struct ifla_rmnet_flags)); +} + +static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct net_device *real_dev; + struct ifla_rmnet_flags f; + struct rmnet_port *port; + + real_dev = priv->real_dev; + + if (nla_put_u16(skb, IFLA_RMNET_MUX_ID, priv->mux_id)) + goto nla_put_failure; + + if (rmnet_is_real_dev_registered(real_dev)) { + port = rmnet_get_port_rtnl(real_dev); + f.flags = port->data_format; + } else { + f.flags = 0; + } + + f.mask = ~0; + + if (nla_put(skb, IFLA_RMNET_FLAGS, sizeof(f), &f)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +struct rtnl_link_ops rmnet_link_ops __read_mostly = { + .kind = "rmnet", + .maxtype = __IFLA_RMNET_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, + .changelink = rmnet_changelink, + .policy = rmnet_policy, + .fill_info = rmnet_fill_info, +}; + +struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev) +{ + if (rmnet_is_real_dev_registered(real_dev)) + return rcu_dereference_bh(real_dev->rx_handler_data); + else + return NULL; +} + +struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id) +{ + struct rmnet_endpoint *ep; + + hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) { + if (ep->mux_id == mux_id) + return ep; + } + + return NULL; +} + +int rmnet_add_bridge(struct net_device *rmnet_dev, + struct net_device *slave_dev, + struct netlink_ext_ack *extack) +{ + struct rmnet_priv *priv = netdev_priv(rmnet_dev); + struct net_device *real_dev = priv->real_dev; + struct rmnet_port *port, *slave_port; + int err; + + port = rmnet_get_port_rtnl(real_dev); + + /* If there is more than one rmnet dev attached, its probably being + * used for muxing. Skip the briding in that case + */ + if (port->nr_rmnet_devs > 1) + return -EINVAL; + + if (rmnet_is_real_dev_registered(slave_dev)) + return -EBUSY; + + err = rmnet_register_real_device(slave_dev, extack); + if (err) + return -EBUSY; + + err = netdev_master_upper_dev_link(slave_dev, rmnet_dev, NULL, NULL, + extack); + if (err) { + rmnet_unregister_real_device(slave_dev); + return err; + } + + slave_port = rmnet_get_port_rtnl(slave_dev); + slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE; + slave_port->bridge_ep = real_dev; + slave_port->rmnet_dev = rmnet_dev; + + port->rmnet_mode = RMNET_EPMODE_BRIDGE; + port->bridge_ep = slave_dev; + + netdev_dbg(slave_dev, "registered with rmnet as slave\n"); + return 0; +} + +int rmnet_del_bridge(struct net_device *rmnet_dev, + struct net_device *slave_dev) +{ + struct rmnet_port *port = rmnet_get_port_rtnl(slave_dev); + + rmnet_unregister_bridge(port); + + netdev_dbg(slave_dev, "removed from rmnet as slave\n"); + return 0; +} + +/* 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) +{ + rtnl_link_unregister(&rmnet_link_ops); + unregister_netdevice_notifier(&rmnet_dev_notifier); +} + +module_init(rmnet_init) +module_exit(rmnet_exit) +MODULE_LICENSE("GPL v2"); diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h new file mode 100644 index 000000000..7691d1abe --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h @@ -0,0 +1,85 @@ +/* Copyright (c) 2013-2014, 2016-2018 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> +#include <net/gro_cells.h> + +#ifndef _RMNET_CONFIG_H_ +#define _RMNET_CONFIG_H_ + +#define RMNET_MAX_LOGICAL_EP 255 + +struct rmnet_endpoint { + u8 mux_id; + struct net_device *egress_dev; + struct hlist_node hlnode; +}; + +/* One instance of this structure is instantiated for each real_dev associated + * with rmnet. + */ +struct rmnet_port { + struct net_device *dev; + u32 data_format; + u8 nr_rmnet_devs; + u8 rmnet_mode; + struct hlist_head muxed_ep[RMNET_MAX_LOGICAL_EP]; + struct net_device *bridge_ep; + struct net_device *rmnet_dev; +}; + +extern struct rtnl_link_ops rmnet_link_ops; + +struct rmnet_vnd_stats { + u64 rx_pkts; + u64 rx_bytes; + u64 tx_pkts; + u64 tx_bytes; + u32 tx_drops; +}; + +struct rmnet_pcpu_stats { + struct rmnet_vnd_stats stats; + struct u64_stats_sync syncp; +}; + +struct rmnet_priv_stats { + u64 csum_ok; + u64 csum_valid_unset; + u64 csum_validation_failed; + u64 csum_err_bad_buffer; + u64 csum_err_invalid_ip_version; + u64 csum_err_invalid_transport; + u64 csum_fragmented_pkt; + u64 csum_skipped; + u64 csum_sw; +}; + +struct rmnet_priv { + u8 mux_id; + struct net_device *real_dev; + struct rmnet_pcpu_stats __percpu *pcpu_stats; + struct gro_cells gro_cells; + struct rmnet_priv_stats stats; +}; + +struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev); +struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id); +int rmnet_add_bridge(struct net_device *rmnet_dev, + struct net_device *slave_dev, + struct netlink_ext_ack *extack); +int rmnet_del_bridge(struct net_device *rmnet_dev, + struct net_device *slave_dev); +#endif /* _RMNET_CONFIG_H_ */ diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c new file mode 100644 index 000000000..9b1804a22 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c @@ -0,0 +1,252 @@ +/* Copyright (c) 2013-2018, 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 <linux/if_arp.h> +#include <net/sock.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 void +rmnet_deliver_skb(struct sk_buff *skb) +{ + struct rmnet_priv *priv = netdev_priv(skb->dev); + + 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); + gro_cells_receive(&priv->gro_cells, skb); +} + +/* MAP handler */ + +static void +__rmnet_map_ingress_handler(struct sk_buff *skb, + struct rmnet_port *port) +{ + struct rmnet_endpoint *ep; + u16 len, pad; + u8 mux_id; + + if (RMNET_MAP_GET_CD_BIT(skb)) { + if (port->data_format & RMNET_FLAGS_INGRESS_MAP_COMMANDS) + return rmnet_map_command(skb, port); + + goto free_skb; + } + + mux_id = RMNET_MAP_GET_MUX_ID(skb); + pad = RMNET_MAP_GET_PAD(skb); + len = RMNET_MAP_GET_LENGTH(skb) - pad; + + if (mux_id >= RMNET_MAX_LOGICAL_EP) + goto free_skb; + + ep = rmnet_get_endpoint(port, mux_id); + if (!ep) + goto free_skb; + + skb->dev = ep->egress_dev; + + /* Subtract MAP header */ + skb_pull(skb, sizeof(struct rmnet_map_header)); + rmnet_set_skb_proto(skb); + + if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) { + if (!rmnet_map_checksum_downlink_packet(skb, len + pad)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + } + + skb_trim(skb, len); + rmnet_deliver_skb(skb); + return; + +free_skb: + kfree_skb(skb); +} + +static void +rmnet_map_ingress_handler(struct sk_buff *skb, + struct rmnet_port *port) +{ + struct sk_buff *skbn; + + if (skb->dev->type == ARPHRD_ETHER) { + if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_ATOMIC)) { + kfree_skb(skb); + return; + } + + skb_push(skb, ETH_HLEN); + } + + if (port->data_format & RMNET_FLAGS_INGRESS_DEAGGREGATION) { + while ((skbn = rmnet_map_deaggregate(skb, port)) != NULL) + __rmnet_map_ingress_handler(skbn, port); + + consume_skb(skb); + } else { + __rmnet_map_ingress_handler(skb, port); + } +} + +static int rmnet_map_egress_handler(struct sk_buff *skb, + struct rmnet_port *port, u8 mux_id, + 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 (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4) { + additional_header_len = sizeof(struct rmnet_map_ul_csum_header); + required_headroom += additional_header_len; + } + + if (skb_headroom(skb) < required_headroom) { + if (pskb_expand_head(skb, required_headroom, 0, GFP_ATOMIC)) + return -ENOMEM; + } + + if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4) + rmnet_map_checksum_uplink_packet(skb, orig_dev); + + map_header = rmnet_map_add_map_header(skb, additional_header_len, 0); + if (!map_header) + return -ENOMEM; + + map_header->mux_id = mux_id; + + skb->protocol = htons(ETH_P_MAP); + + return 0; +} + +static void +rmnet_bridge_handler(struct sk_buff *skb, struct net_device *bridge_dev) +{ + if (skb_mac_header_was_set(skb)) + skb_push(skb, skb->mac_len); + + if (bridge_dev) { + skb->dev = bridge_dev; + dev_queue_xmit(skb); + } +} + +/* 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 sk_buff *skb = *pskb; + struct rmnet_port *port; + struct net_device *dev; + + if (!skb) + goto done; + + if (skb->pkt_type == PACKET_LOOPBACK) + return RX_HANDLER_PASS; + + dev = skb->dev; + port = rmnet_get_port_rcu(dev); + if (unlikely(!port)) { + atomic_long_inc(&skb->dev->rx_nohandler); + kfree_skb(skb); + goto done; + } + + switch (port->rmnet_mode) { + case RMNET_EPMODE_VND: + rmnet_map_ingress_handler(skb, port); + break; + case RMNET_EPMODE_BRIDGE: + rmnet_bridge_handler(skb, port->bridge_ep); + break; + } + +done: + return RX_HANDLER_CONSUMED; +} + +/* 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 net_device *orig_dev; + struct rmnet_port *port; + struct rmnet_priv *priv; + u8 mux_id; + + sk_pacing_shift_update(skb->sk, 8); + + orig_dev = skb->dev; + priv = netdev_priv(orig_dev); + skb->dev = priv->real_dev; + mux_id = priv->mux_id; + + port = rmnet_get_port_rcu(skb->dev); + if (!port) + goto drop; + + if (rmnet_map_egress_handler(skb, port, mux_id, orig_dev)) + goto drop; + + rmnet_vnd_tx_fixup(skb, orig_dev); + + dev_queue_xmit(skb); + return; + +drop: + this_cpu_inc(priv->pcpu_stats->stats.tx_drops); + kfree_skb(skb); +} diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.h new file mode 100644 index 000000000..3537e4cee --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.h @@ -0,0 +1,25 @@ +/* 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); + +rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb); + +#endif /* _RMNET_HANDLERS_H_ */ diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h new file mode 100644 index 000000000..70879a3ab --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h @@ -0,0 +1,95 @@ +/* Copyright (c) 2013-2018, 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; + __be16 flow_control_seq_num; + __be32 qos_id; + } flow_control; + u8 data[0]; + }; +} __aligned(1); + +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; + __be16 pkt_len; +} __aligned(1); + +struct rmnet_map_dl_csum_trailer { + u8 reserved1; + u8 valid:1; + u8 reserved2:7; + u16 csum_start_offset; + u16 csum_length; + __be16 csum_value; +} __aligned(1); + +struct rmnet_map_ul_csum_header { + __be16 csum_start_offset; + u16 csum_insert_offset:14; + u16 udp_ind:1; + u16 csum_enabled:1; +} __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 + +struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb, + struct rmnet_port *port); +struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb, + int hdrlen, int pad); +void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port); +int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len); +void rmnet_map_checksum_uplink_packet(struct sk_buff *skb, + struct net_device *orig_dev); + +#endif /* _RMNET_MAP_H_ */ diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c new file mode 100644 index 000000000..3ee8ae9b6 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c @@ -0,0 +1,114 @@ +/* Copyright (c) 2013-2018, 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_port *port, + 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 = rmnet_get_endpoint(port, mux_id); + if (!ep) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + + 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_port *port) +{ + struct rmnet_map_control_command *cmd; + struct net_device *dev = skb->dev; + + if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) + skb_trim(skb, + skb->len - sizeof(struct rmnet_map_dl_csum_trailer)); + + skb->protocol = htons(ETH_P_MAP); + + cmd = RMNET_MAP_GET_CMD_START(skb); + cmd->cmd_type = type & 0x03; + + netif_tx_lock(dev); + dev->netdev_ops->ndo_start_xmit(skb, dev); + netif_tx_unlock(dev); +} + +/* Process MAP command frame and send N/ACK message as appropriate. Message cmd + * name is decoded here and appropriate handler is called. + */ +void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port) +{ + 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, port, 1); + break; + + case RMNET_MAP_COMMAND_FLOW_DISABLE: + rc = rmnet_map_do_flow_control(skb, port, 0); + break; + + default: + rc = RMNET_MAP_COMMAND_UNSUPPORTED; + kfree_skb(skb); + break; + } + if (rc == RMNET_MAP_COMMAND_ACK) + rmnet_map_send_ack(skb, rc, port); +} diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c new file mode 100644 index 000000000..b2090cedd --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c @@ -0,0 +1,439 @@ +/* Copyright (c) 2013-2018, 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 <linux/ip.h> +#include <linux/ipv6.h> +#include <net/ip6_checksum.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) + +static __sum16 *rmnet_map_get_csum_field(unsigned char protocol, + const void *txporthdr) +{ + __sum16 *check = NULL; + + switch (protocol) { + case IPPROTO_TCP: + check = &(((struct tcphdr *)txporthdr)->check); + break; + + case IPPROTO_UDP: + check = &(((struct udphdr *)txporthdr)->check); + break; + + default: + check = NULL; + break; + } + + return check; +} + +static int +rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb, + struct rmnet_map_dl_csum_trailer *csum_trailer, + struct rmnet_priv *priv) +{ + __sum16 *csum_field, csum_temp, pseudo_csum, hdr_csum, ip_payload_csum; + u16 csum_value, csum_value_final; + struct iphdr *ip4h; + void *txporthdr; + __be16 addend; + + ip4h = (struct iphdr *)(skb->data); + if ((ntohs(ip4h->frag_off) & IP_MF) || + ((ntohs(ip4h->frag_off) & IP_OFFSET) > 0)) { + priv->stats.csum_fragmented_pkt++; + return -EOPNOTSUPP; + } + + txporthdr = skb->data + ip4h->ihl * 4; + + csum_field = rmnet_map_get_csum_field(ip4h->protocol, txporthdr); + + if (!csum_field) { + priv->stats.csum_err_invalid_transport++; + return -EPROTONOSUPPORT; + } + + /* RFC 768 - Skip IPv4 UDP packets where sender checksum field is 0 */ + if (*csum_field == 0 && ip4h->protocol == IPPROTO_UDP) { + priv->stats.csum_skipped++; + return 0; + } + + csum_value = ~ntohs(csum_trailer->csum_value); + hdr_csum = ~ip_fast_csum(ip4h, (int)ip4h->ihl); + ip_payload_csum = csum16_sub((__force __sum16)csum_value, + (__force __be16)hdr_csum); + + pseudo_csum = ~csum_tcpudp_magic(ip4h->saddr, ip4h->daddr, + ntohs(ip4h->tot_len) - ip4h->ihl * 4, + ip4h->protocol, 0); + addend = (__force __be16)ntohs((__force __be16)pseudo_csum); + pseudo_csum = csum16_add(ip_payload_csum, addend); + + addend = (__force __be16)ntohs((__force __be16)*csum_field); + csum_temp = ~csum16_sub(pseudo_csum, addend); + csum_value_final = (__force u16)csum_temp; + + if (unlikely(csum_value_final == 0)) { + switch (ip4h->protocol) { + case IPPROTO_UDP: + /* RFC 768 - DL4 1's complement rule for UDP csum 0 */ + csum_value_final = ~csum_value_final; + break; + + case IPPROTO_TCP: + /* DL4 Non-RFC compliant TCP checksum found */ + if (*csum_field == (__force __sum16)0xFFFF) + csum_value_final = ~csum_value_final; + break; + } + } + + if (csum_value_final == ntohs((__force __be16)*csum_field)) { + priv->stats.csum_ok++; + return 0; + } else { + priv->stats.csum_validation_failed++; + return -EINVAL; + } +} + +#if IS_ENABLED(CONFIG_IPV6) +static int +rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, + struct rmnet_map_dl_csum_trailer *csum_trailer, + struct rmnet_priv *priv) +{ + __sum16 *csum_field, ip6_payload_csum, pseudo_csum, csum_temp; + u16 csum_value, csum_value_final; + __be16 ip6_hdr_csum, addend; + struct ipv6hdr *ip6h; + void *txporthdr; + u32 length; + + ip6h = (struct ipv6hdr *)(skb->data); + + txporthdr = skb->data + sizeof(struct ipv6hdr); + csum_field = rmnet_map_get_csum_field(ip6h->nexthdr, txporthdr); + + if (!csum_field) { + priv->stats.csum_err_invalid_transport++; + return -EPROTONOSUPPORT; + } + + csum_value = ~ntohs(csum_trailer->csum_value); + ip6_hdr_csum = (__force __be16) + ~ntohs((__force __be16)ip_compute_csum(ip6h, + (int)(txporthdr - (void *)(skb->data)))); + ip6_payload_csum = csum16_sub((__force __sum16)csum_value, + ip6_hdr_csum); + + length = (ip6h->nexthdr == IPPROTO_UDP) ? + ntohs(((struct udphdr *)txporthdr)->len) : + ntohs(ip6h->payload_len); + pseudo_csum = ~(csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, + length, ip6h->nexthdr, 0)); + addend = (__force __be16)ntohs((__force __be16)pseudo_csum); + pseudo_csum = csum16_add(ip6_payload_csum, addend); + + addend = (__force __be16)ntohs((__force __be16)*csum_field); + csum_temp = ~csum16_sub(pseudo_csum, addend); + csum_value_final = (__force u16)csum_temp; + + if (unlikely(csum_value_final == 0)) { + switch (ip6h->nexthdr) { + case IPPROTO_UDP: + /* RFC 2460 section 8.1 + * DL6 One's complement rule for UDP checksum 0 + */ + csum_value_final = ~csum_value_final; + break; + + case IPPROTO_TCP: + /* DL6 Non-RFC compliant TCP checksum found */ + if (*csum_field == (__force __sum16)0xFFFF) + csum_value_final = ~csum_value_final; + break; + } + } + + if (csum_value_final == ntohs((__force __be16)*csum_field)) { + priv->stats.csum_ok++; + return 0; + } else { + priv->stats.csum_validation_failed++; + return -EINVAL; + } +} +#endif + +static void rmnet_map_complement_ipv4_txporthdr_csum_field(void *iphdr) +{ + struct iphdr *ip4h = (struct iphdr *)iphdr; + void *txphdr; + u16 *csum; + + txphdr = iphdr + ip4h->ihl * 4; + + if (ip4h->protocol == IPPROTO_TCP || ip4h->protocol == IPPROTO_UDP) { + csum = (u16 *)rmnet_map_get_csum_field(ip4h->protocol, txphdr); + *csum = ~(*csum); + } +} + +static void +rmnet_map_ipv4_ul_csum_header(void *iphdr, + struct rmnet_map_ul_csum_header *ul_header, + struct sk_buff *skb) +{ + struct iphdr *ip4h = (struct iphdr *)iphdr; + __be16 *hdr = (__be16 *)ul_header, offset; + + offset = htons((__force u16)(skb_transport_header(skb) - + (unsigned char *)iphdr)); + ul_header->csum_start_offset = offset; + ul_header->csum_insert_offset = skb->csum_offset; + ul_header->csum_enabled = 1; + if (ip4h->protocol == IPPROTO_UDP) + ul_header->udp_ind = 1; + else + ul_header->udp_ind = 0; + + /* Changing remaining fields to network order */ + hdr++; + *hdr = htons((__force u16)*hdr); + + skb->ip_summed = CHECKSUM_NONE; + + rmnet_map_complement_ipv4_txporthdr_csum_field(iphdr); +} + +#if IS_ENABLED(CONFIG_IPV6) +static void rmnet_map_complement_ipv6_txporthdr_csum_field(void *ip6hdr) +{ + struct ipv6hdr *ip6h = (struct ipv6hdr *)ip6hdr; + void *txphdr; + u16 *csum; + + txphdr = ip6hdr + sizeof(struct ipv6hdr); + + if (ip6h->nexthdr == IPPROTO_TCP || ip6h->nexthdr == IPPROTO_UDP) { + csum = (u16 *)rmnet_map_get_csum_field(ip6h->nexthdr, txphdr); + *csum = ~(*csum); + } +} + +static void +rmnet_map_ipv6_ul_csum_header(void *ip6hdr, + struct rmnet_map_ul_csum_header *ul_header, + struct sk_buff *skb) +{ + struct ipv6hdr *ip6h = (struct ipv6hdr *)ip6hdr; + __be16 *hdr = (__be16 *)ul_header, offset; + + offset = htons((__force u16)(skb_transport_header(skb) - + (unsigned char *)ip6hdr)); + ul_header->csum_start_offset = offset; + ul_header->csum_insert_offset = skb->csum_offset; + ul_header->csum_enabled = 1; + + if (ip6h->nexthdr == IPPROTO_UDP) + ul_header->udp_ind = 1; + else + ul_header->udp_ind = 0; + + /* Changing remaining fields to network order */ + hdr++; + *hdr = htons((__force u16)*hdr); + + skb->ip_summed = CHECKSUM_NONE; + + rmnet_map_complement_ipv6_txporthdr_csum_field(ip6hdr); +} +#endif + +/* 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; + + 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_port *port) +{ + 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 (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) + packet_len += sizeof(struct rmnet_map_dl_csum_trailer); + + if (((int)skb->len - (int)packet_len) < 0) + return NULL; + + /* Some hardware can send us empty frames. Catch them */ + if (ntohs(maph->pkt_len) == 0) + return NULL; + + skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC); + if (!skbn) + return NULL; + + skb_reserve(skbn, RMNET_MAP_DEAGGR_HEADROOM); + skb_put(skbn, packet_len); + memcpy(skbn->data, skb->data, packet_len); + skb_pull(skb, packet_len); + + return skbn; +} + +/* Validates packet checksums. Function takes a pointer to + * the beginning of a buffer which contains the IP payload + + * padding + checksum trailer. + * Only IPv4 and IPv6 are supported along with TCP & UDP. + * Fragmented or tunneled packets are not supported. + */ +int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len) +{ + struct rmnet_priv *priv = netdev_priv(skb->dev); + struct rmnet_map_dl_csum_trailer *csum_trailer; + + if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { + priv->stats.csum_sw++; + return -EOPNOTSUPP; + } + + csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len); + + if (!csum_trailer->valid) { + priv->stats.csum_valid_unset++; + return -EINVAL; + } + + if (skb->protocol == htons(ETH_P_IP)) { + return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer, priv); + } else if (skb->protocol == htons(ETH_P_IPV6)) { +#if IS_ENABLED(CONFIG_IPV6) + return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer, priv); +#else + priv->stats.csum_err_invalid_ip_version++; + return -EPROTONOSUPPORT; +#endif + } else { + priv->stats.csum_err_invalid_ip_version++; + return -EPROTONOSUPPORT; + } + + return 0; +} + +/* Generates UL checksum meta info header for IPv4 and IPv6 over TCP and UDP + * packets that are supported for UL checksum offload. + */ +void rmnet_map_checksum_uplink_packet(struct sk_buff *skb, + struct net_device *orig_dev) +{ + struct rmnet_priv *priv = netdev_priv(orig_dev); + struct rmnet_map_ul_csum_header *ul_header; + void *iphdr; + + ul_header = (struct rmnet_map_ul_csum_header *) + skb_push(skb, sizeof(struct rmnet_map_ul_csum_header)); + + if (unlikely(!(orig_dev->features & + (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))) + goto sw_csum; + + if (skb->ip_summed == CHECKSUM_PARTIAL) { + iphdr = (char *)ul_header + + sizeof(struct rmnet_map_ul_csum_header); + + if (skb->protocol == htons(ETH_P_IP)) { + rmnet_map_ipv4_ul_csum_header(iphdr, ul_header, skb); + return; + } else if (skb->protocol == htons(ETH_P_IPV6)) { +#if IS_ENABLED(CONFIG_IPV6) + rmnet_map_ipv6_ul_csum_header(iphdr, ul_header, skb); + return; +#else + priv->stats.csum_err_invalid_ip_version++; + goto sw_csum; +#endif + } else { + priv->stats.csum_err_invalid_ip_version++; + } + } + +sw_csum: + ul_header->csum_start_offset = 0; + ul_header->csum_insert_offset = 0; + ul_header->csum_enabled = 0; + ul_header->udp_ind = 0; + + priv->stats.csum_sw++; +} diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h new file mode 100644 index 000000000..b9cc4f85f --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h @@ -0,0 +1,26 @@ +/* Copyright (c) 2013-2014, 2016-2018 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_PACKET_SIZE 16384 +#define RMNET_DFLT_PACKET_SIZE 1500 +#define RMNET_NEEDED_HEADROOM 16 +#define RMNET_TX_QUEUE_LEN 1000 + +/* 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_ */ diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c new file mode 100644 index 000000000..ed02926f5 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c @@ -0,0 +1,292 @@ +/* Copyright (c) 2013-2018, 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) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct rmnet_pcpu_stats *pcpu_ptr; + + pcpu_ptr = this_cpu_ptr(priv->pcpu_stats); + + u64_stats_update_begin(&pcpu_ptr->syncp); + pcpu_ptr->stats.rx_pkts++; + pcpu_ptr->stats.rx_bytes += skb->len; + u64_stats_update_end(&pcpu_ptr->syncp); +} + +void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct rmnet_pcpu_stats *pcpu_ptr; + + pcpu_ptr = this_cpu_ptr(priv->pcpu_stats); + + u64_stats_update_begin(&pcpu_ptr->syncp); + pcpu_ptr->stats.tx_pkts++; + pcpu_ptr->stats.tx_bytes += skb->len; + u64_stats_update_end(&pcpu_ptr->syncp); +} + +/* 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->real_dev) { + rmnet_egress_handler(skb); + } else { + this_cpu_inc(priv->pcpu_stats->stats.tx_drops); + 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 int rmnet_vnd_get_iflink(const struct net_device *dev) +{ + struct rmnet_priv *priv = netdev_priv(dev); + + return priv->real_dev->ifindex; +} + +static int rmnet_vnd_init(struct net_device *dev) +{ + struct rmnet_priv *priv = netdev_priv(dev); + int err; + + priv->pcpu_stats = alloc_percpu(struct rmnet_pcpu_stats); + if (!priv->pcpu_stats) + return -ENOMEM; + + err = gro_cells_init(&priv->gro_cells, dev); + if (err) { + free_percpu(priv->pcpu_stats); + return err; + } + + return 0; +} + +static void rmnet_vnd_uninit(struct net_device *dev) +{ + struct rmnet_priv *priv = netdev_priv(dev); + + gro_cells_destroy(&priv->gro_cells); + free_percpu(priv->pcpu_stats); +} + +static void rmnet_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *s) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct rmnet_vnd_stats total_stats; + struct rmnet_pcpu_stats *pcpu_ptr; + unsigned int cpu, start; + + memset(&total_stats, 0, sizeof(struct rmnet_vnd_stats)); + + for_each_possible_cpu(cpu) { + pcpu_ptr = per_cpu_ptr(priv->pcpu_stats, cpu); + + do { + start = u64_stats_fetch_begin_irq(&pcpu_ptr->syncp); + total_stats.rx_pkts += pcpu_ptr->stats.rx_pkts; + total_stats.rx_bytes += pcpu_ptr->stats.rx_bytes; + total_stats.tx_pkts += pcpu_ptr->stats.tx_pkts; + total_stats.tx_bytes += pcpu_ptr->stats.tx_bytes; + } while (u64_stats_fetch_retry_irq(&pcpu_ptr->syncp, start)); + + total_stats.tx_drops += pcpu_ptr->stats.tx_drops; + } + + s->rx_packets = total_stats.rx_pkts; + s->rx_bytes = total_stats.rx_bytes; + s->tx_packets = total_stats.tx_pkts; + s->tx_bytes = total_stats.tx_bytes; + s->tx_dropped = total_stats.tx_drops; +} + +static const struct net_device_ops rmnet_vnd_ops = { + .ndo_start_xmit = rmnet_vnd_start_xmit, + .ndo_change_mtu = rmnet_vnd_change_mtu, + .ndo_get_iflink = rmnet_vnd_get_iflink, + .ndo_add_slave = rmnet_add_bridge, + .ndo_del_slave = rmnet_del_bridge, + .ndo_init = rmnet_vnd_init, + .ndo_uninit = rmnet_vnd_uninit, + .ndo_get_stats64 = rmnet_get_stats64, +}; + +static const char rmnet_gstrings_stats[][ETH_GSTRING_LEN] = { + "Checksum ok", + "Checksum valid bit not set", + "Checksum validation failed", + "Checksum error bad buffer", + "Checksum error bad ip version", + "Checksum error bad transport", + "Checksum skipped on ip fragment", + "Checksum skipped", + "Checksum computed in software", +}; + +static void rmnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf) +{ + switch (stringset) { + case ETH_SS_STATS: + memcpy(buf, &rmnet_gstrings_stats, + sizeof(rmnet_gstrings_stats)); + break; + } +} + +static int rmnet_get_sset_count(struct net_device *dev, int sset) +{ + switch (sset) { + case ETH_SS_STATS: + return ARRAY_SIZE(rmnet_gstrings_stats); + default: + return -EOPNOTSUPP; + } +} + +static void rmnet_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, u64 *data) +{ + struct rmnet_priv *priv = netdev_priv(dev); + struct rmnet_priv_stats *st = &priv->stats; + + if (!data) + return; + + memcpy(data, st, ARRAY_SIZE(rmnet_gstrings_stats) * sizeof(u64)); +} + +static const struct ethtool_ops rmnet_ethtool_ops = { + .get_ethtool_stats = rmnet_get_ethtool_stats, + .get_strings = rmnet_get_strings, + .get_sset_count = rmnet_get_sset_count, +}; + +/* 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) +{ + rmnet_dev->netdev_ops = &rmnet_vnd_ops; + rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE; + rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM; + eth_random_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; + rmnet_dev->ethtool_ops = &rmnet_ethtool_ops; + + /* This perm addr will be used as interface identifier by IPv6 */ + rmnet_dev->addr_assign_type = NET_ADDR_RANDOM; + eth_random_addr(rmnet_dev->perm_addr); +} + +/* Exposed API */ + +int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev, + struct rmnet_port *port, + struct net_device *real_dev, + struct rmnet_endpoint *ep) +{ + struct rmnet_priv *priv = netdev_priv(rmnet_dev); + int rc; + + if (ep->egress_dev) + return -EINVAL; + + if (rmnet_get_endpoint(port, id)) + return -EBUSY; + + rmnet_dev->hw_features = NETIF_F_RXCSUM; + rmnet_dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + rmnet_dev->hw_features |= NETIF_F_SG; + + priv->real_dev = real_dev; + + rc = register_netdevice(rmnet_dev); + if (!rc) { + ep->egress_dev = rmnet_dev; + ep->mux_id = id; + port->nr_rmnet_devs++; + + rmnet_dev->rtnl_link_ops = &rmnet_link_ops; + + priv->mux_id = id; + + netdev_dbg(rmnet_dev, "rmnet dev created\n"); + } + + return rc; +} + +int rmnet_vnd_dellink(u8 id, struct rmnet_port *port, + struct rmnet_endpoint *ep) +{ + if (id >= RMNET_MAX_LOGICAL_EP || !ep->egress_dev) + return -EINVAL; + + ep->egress_dev = NULL; + port->nr_rmnet_devs--; + return 0; +} + +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; +} diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.h new file mode 100644 index 000000000..22cfdfd56 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.h @@ -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); +int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev, + struct rmnet_port *port, + struct net_device *real_dev, + struct rmnet_endpoint *ep); +int rmnet_vnd_dellink(u8 id, struct rmnet_port *port, + struct rmnet_endpoint *ep); +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); +void rmnet_vnd_setup(struct net_device *dev); +#endif /* _RMNET_VND_H_ */ |