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vfs_lwip/lwip: Lwip::lock for concurrent access

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This is required in case the send and receive of IP packets is
performed by multiple thread because lwip is not thread safe.

issue #3568
This commit is contained in:
Sebastian Sumpf 2019-12-06 14:12:04 +01:00 committed by Christian Helmuth
parent 9812799b24
commit 9767c4db0e
4 changed files with 31 additions and 15 deletions
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6
repos/libports/include/lwip/genode_init.h
View File

@ -17,6 +17,10 @@
#include <timer/timeout.h>
#include <base/allocator.h>
namespace Lwip { void genode_init(Genode::Allocator &heap, Genode::Timeout_scheduler &timer); }
namespace Lwip {
void genode_init(Genode::Allocator &heap, Genode::Timeout_scheduler &timer);
Genode::Lock &lock();
}
#endif

2
repos/libports/include/lwip/nic_netif.h
View File

@ -26,6 +26,7 @@
#endif
/* Genode includes */
#include <lwip/genode_init.h>
#include <nic/packet_allocator.h>
#include <nic_session/connection.h>
#include <base/log.h>
@ -140,6 +141,7 @@ class Lwip::Nic_netif
void handle_rx_packets()
{
Genode::Lock::Guard g { Lwip::lock() };
auto &rx = *_nic.rx();
while (rx.packet_avail() && rx.ready_to_ack()) {

13
repos/libports/src/lib/lwip/platform/sys_arch.cc
View File

@ -36,8 +36,11 @@ namespace Lwip {
struct Sys_timer
{
void check_timeouts(Genode::Duration) {
sys_check_timeouts(); }
void check_timeouts(Genode::Duration)
{
Genode::Lock::Guard g{ Lwip::lock() };
sys_check_timeouts();
}
Genode::Timeout_scheduler &timer;
@ -62,6 +65,12 @@ namespace Lwip {
lwip_init();
}
Genode::Lock &lock()
{
static Genode::Lock _lwip_lock;
return _lwip_lock;
}
}

25
repos/libports/src/lib/vfs/lwip/vfs.cc
View File

@ -898,6 +898,7 @@ class Lwip::Udp_socket_dir final :
char *dst, file_size count,
file_size &out_count) override
{
Genode::Lock::Guard g { Lwip::lock() };
Read_result result = Read_result::READ_ERR_INVALID;
switch(handle.kind) {
@ -983,6 +984,8 @@ class Lwip::Udp_socket_dir final :
char const *src, file_size count,
file_size &out_count) override
{
Genode::Lock::Guard g { Lwip::lock() };
switch(handle.kind) {
case Lwip_file_handle::DATA: {
@ -1287,6 +1290,8 @@ class Lwip::Tcp_socket_dir final :
char *dst, file_size count,
file_size &out_count) override
{
Genode::Lock::Guard g { Lwip::lock() };
switch(handle.kind) {
case Lwip_file_handle::DATA:
@ -1371,7 +1376,11 @@ class Lwip::Tcp_socket_dir final :
handle.kind = Lwip_file_handle::LOCATION;
/* read the location of the new socket directory */
return handle.read(dst, count, out_count);
Lwip::lock().unlock();
Read_result result = handle.read(dst, count, out_count);
Lwip::lock().lock();
return result;
}
return Read_result::READ_QUEUED;
@ -1433,6 +1442,7 @@ class Lwip::Tcp_socket_dir final :
char const *src, file_size count,
file_size &out_count) override
{
Genode::Lock::Guard g { Lwip::lock() };
if (_pcb == NULL) {
/* socket is closed */
return Write_result::WRITE_ERR_IO;
@ -1958,17 +1968,8 @@ class Lwip::File_system final : public Vfs::File_system, public Lwip::Directory
if ((vfs_handle->status_flags() & OPEN_MODE_ACCMODE) == OPEN_MODE_RDONLY)
return Write_result::WRITE_ERR_INVALID;
if (Lwip_handle *handle = dynamic_cast<Lwip_handle*>(vfs_handle)) {
while (true) {
res = handle->write(src, count, out_count);
if (res != WRITE_ERR_WOULD_BLOCK || out_count) break;
/*
* XXX: block for signals until the write completes
* or fails, this is not how it should be done, but
* it's how lxip does it
*/
_ep.wait_and_dispatch_one_io_signal();
}
res = handle->write(src, count, out_count);
if (res == WRITE_ERR_WOULD_BLOCK) throw Insufficient_buffer();
}
return res;
}