127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
/*
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* \brief Freescale ethernet driver component
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* \author Stefan Kalkowski
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* \date 2017-11-01
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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#ifndef _SRC__DRIVERS__NIC__FEC__COMPONENT_H_
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#define _SRC__DRIVERS__NIC__FEC__COMPONENT_H_
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/* Genode includes */
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#include <nic/component.h>
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#include <root/component.h>
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#include <lx_kit/scheduler.h>
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extern "C" {
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struct net_device;
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struct napi_struct;
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struct sk_buff;
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}
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class Session_component : public Nic::Session_component
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{
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private:
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struct Tx_data
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{
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net_device * ndev;
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sk_buff * skb;
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};
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struct Rx_data
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{
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struct napi_struct * napi;
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};
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net_device * _ndev = nullptr;
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bool _has_link = false;
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Tx_data _tx_data;
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Rx_data _rx_data;
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static void _run_tx_task(void * args);
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static void _run_rx_task(void * args);
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static net_device * _register_session_component(Session_component &,
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Genode::Session_label);
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Lx::Task _tx_task { _run_tx_task, &_tx_data, "tx_task",
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Lx::Task::PRIORITY_1, Lx::scheduler() };
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Lx::Task _rx_task { _run_rx_task, &_rx_data, "rx_task",
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Lx::Task::PRIORITY_1, Lx::scheduler() };
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bool _send();
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void _handle_rx();
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void _handle_packet_stream() override;
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public:
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Session_component(Genode::size_t const tx_buf_size,
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Genode::size_t const rx_buf_size,
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Genode::Allocator & rx_block_md_alloc,
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Genode::Env & env,
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Genode::Session_label label);
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Nic::Mac_address mac_address() override;
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bool link_state() override { return _has_link; }
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void link_state(bool link);
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void receive(struct sk_buff *skb);
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void unblock_rx_task(napi_struct * n);
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};
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class Root : public Genode::Root_component<Session_component>
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{
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private:
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Genode::Env &_env;
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Genode::Allocator &_md_alloc;
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protected:
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Session_component *_create_session(const char *args)
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{
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using namespace Genode;
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Session_label const label = label_from_args(args);
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size_t ram_quota = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
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size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
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/* deplete ram quota by the memory needed for the session structure */
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size_t session_size = max(4096UL, (unsigned long)sizeof(Session_component));
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/*
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* Check if donated ram quota suffices for both communication
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* buffers and check for overflow
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*/
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if ((ram_quota < session_size) ||
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(tx_buf_size + rx_buf_size < tx_buf_size ||
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tx_buf_size + rx_buf_size > ram_quota - session_size)) {
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Genode::error("insufficient 'ram_quota', got ", ram_quota, ", "
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"need ", tx_buf_size + rx_buf_size + session_size);
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throw Genode::Insufficient_ram_quota();
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}
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return new (Root::md_alloc())
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Session_component(tx_buf_size, rx_buf_size,
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_md_alloc, _env, label);
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}
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public:
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Root(Genode::Env &env, Genode::Allocator &md_alloc)
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: Genode::Root_component<Session_component>(&env.ep().rpc_ep(), &md_alloc),
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_env(env), _md_alloc(md_alloc)
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{ }
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};
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#endif /* _SRC__DRIVERS__NIC__FEC__COMPONENT_H_ */
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