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Kernel: Plumb packet receive timestamp from NetworkAdapter to Socket::recvfrom

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Since the receiving socket isn't yet known at packet receive time,
keep timestamps for all packets.

This is useful for keeping statistics about in-kernel queue latencies
in the future, and it can be used to implement SO_TIMESTAMP.
This commit is contained in:
Nico Weber 2020-09-16 12:25:06 -04:00 • committed by Andreas Kling
parent b36a2d6686
commit 416d470d07
10 changed files with 52 additions and 37 deletions
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10
Kernel/Net/NetworkAdapter.h
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@ -67,7 +67,7 @@ public:
int send_ipv4(const MACAddress&, const IPv4Address&, IPv4Protocol, const UserOrKernelBuffer& payload, size_t payload_size, u8 ttl);
int send_ipv4_fragmented(const MACAddress&, const IPv4Address&, IPv4Protocol, const UserOrKernelBuffer& payload, size_t payload_size, u8 ttl);
size_t dequeue_packet(u8* buffer, size_t buffer_size);
size_t dequeue_packet(u8* buffer, size_t buffer_size, timeval& packet_timestamp);
bool has_queued_packets() const { return !m_packet_queue.is_empty(); }
@ -93,7 +93,13 @@ private:
IPv4Address m_ipv4_address;
IPv4Address m_ipv4_netmask;
IPv4Address m_ipv4_gateway;
SinglyLinkedList<KBuffer> m_packet_queue;
struct PacketWithTimestamp {
KBuffer packet;
timeval timestamp;
};
SinglyLinkedList<PacketWithTimestamp> m_packet_queue;
SinglyLinkedList<KBuffer> m_unused_packet_buffers;
size_t m_unused_packet_buffers_count { 0 };
String m_name;