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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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aacb0c2e52
After prior kernel change, mmap() on TCP socket only reserves VMA.
We have to use getsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...)
to perform the transfert of pages from skbs in TCP receive queue into such VMA.
struct tcp_zerocopy_receive {
__u64 address; /* in: address of mapping */
__u32 length; /* in/out: number of bytes to map/mapped */
__u32 recv_skip_hint; /* out: amount of bytes to skip */
};
After a successful getsockopt(...TCP_ZEROCOPY_RECEIVE...), @length contains
number of bytes that were mapped, and @recv_skip_hint contains number of bytes
that should be read using conventional read()/recv()/recvmsg() system calls,
to skip a sequence of bytes that can not be mapped, because not properly page
aligned.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| .. | ||
| forwarding | ||
| .gitignore | ||
| config | ||
| fib_tests.sh | ||
| fib-onlink-tests.sh | ||
| in_netns.sh | ||
| Makefile | ||
| msg_zerocopy.c | ||
| msg_zerocopy.sh | ||
| netdevice.sh | ||
| pmtu.sh | ||
| psock_fanout.c | ||
| psock_lib.h | ||
| psock_tpacket.c | ||
| reuseaddr_conflict.c | ||
| reuseport_bpf_cpu.c | ||
| reuseport_bpf_numa.c | ||
| reuseport_bpf.c | ||
| reuseport_dualstack.c | ||
| rtnetlink.sh | ||
| run_afpackettests | ||
| run_netsocktests | ||
| socket.c | ||
| tcp_mmap.c | ||
| test_bpf.sh | ||
| udpgso_bench_rx.c | ||
| udpgso_bench_tx.c | ||
| udpgso_bench.sh | ||
| udpgso.c | ||
| udpgso.sh | ||