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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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3
Kernel/Syscalls/socket.cpp
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@ -249,7 +249,8 @@ ssize_t Process::sys$recvmsg(int sockfd, Userspace<struct msghdr*> user_msg, int
auto data_buffer = UserOrKernelBuffer::for_user_buffer((u8*)iovs[0].iov_base, iovs[0].iov_len);
if (!data_buffer.has_value())
return -EFAULT;
auto result = socket.recvfrom(*description, data_buffer.value(), iovs[0].iov_len, flags, user_addr, user_addr_length);
timeval timestamp = { 0, 0 };
auto result = socket.recvfrom(*description, data_buffer.value(), iovs[0].iov_len, flags, user_addr, user_addr_length, timestamp);
if (flags & MSG_DONTWAIT)
description->set_blocking(original_blocking);