mirrors/passt
1
0
Fork 0
mirror of https://passt.top/passt synced 2025-05-29 20:35:40 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

checksum: Introduce AVX2 implementation, unify helpers

Browse source 
Provide an AVX2-based function using compiler intrinsics for
TCP/IP-style checksums. The load/unpack/add idea and implementation
is largely based on code from BESS (the Berkeley Extensible Software
Switch) licensed as 3-Clause BSD, with a number of modifications to
further decrease pipeline stalls and to minimise cache pollution.

This speeds up considerably data paths from sockets to tap
interfaces, decreasing overhead for checksum computation, with
16-64KiB packet buffers, from approximately 11% to 7%. The rest is
just syscalls at this point.

While at it, provide convenience targets in the Makefile for avx2,
avx2_debug, and debug targets -- these simply add target-specific
CFLAGS to the build.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-26 07:18:50 +02:00
parent 0be49ccd93
commit 17765f8de0
8 changed files with 332 additions and 92 deletions

19
Makefile
View file

@ -3,8 +3,23 @@ CFLAGS += -DRLIMIT_STACK_VAL=$(shell ulimit -s)
all: passt pasta passt4netns qrap
passt: passt.c passt.h arp.c arp.h dhcp.c dhcp.h dhcpv6.c dhcpv6.h pcap.c pcap.h ndp.c ndp.h siphash.c siphash.h tap.c tap.h icmp.c icmp.h tcp.c tcp.h udp.c udp.h util.c util.h
$(CC) $(CFLAGS) passt.c arp.c dhcp.c dhcpv6.c pcap.c ndp.c siphash.c tap.c icmp.c tcp.c udp.c util.c -o passt
avx2: CFLAGS += -Ofast -mavx2 -ftree-vectorize -funroll-loops
avx2: clean all
avx2_debug: CFLAGS += -Ofast -mavx2 -ftree-vectorize -funroll-loops -DDEBUG -g
avx2_debug: clean all
static: CFLAGS += -static
static: clean all
debug: CFLAGS += -static -DDEBUG -g
debug: clean all
passt: passt.c passt.h arp.c arp.h checksum.c checksum.h dhcp.c dhcp.h \
dhcpv6.c dhcpv6.h pcap.c pcap.h ndp.c ndp.h siphash.c siphash.h \
tap.c tap.h icmp.c icmp.h tcp.c tcp.h udp.c udp.h util.c util.h
$(CC) $(CFLAGS) passt.c arp.c checksum.c dhcp.c dhcpv6.c pcap.c ndp.c \
siphash.c tap.c icmp.c tcp.c udp.c util.c -o passt
pasta: passt
ln -s passt pasta