This fix is for IPv6 checksum offload error on RHEL65.
Any optimalisation above -O0 provide error in IPv6 checksum
flag "-fstrict-aliasing" is default for optimalisation above -O0.
The solution is to add typedef with __attribute__((__may_alias__) for uint16_t.
Step 1 : start testpmd
./testpmd -c 0x6 -n 4 -- -i --portmask=0x3 --disable-hw-vlan --enable-rx-cksum
--crc-strip --txqflags=0
Step 2 : settings and start
set verbose 1
set fwd csum
start
Step 3 : send scapy with bad checksum IPv6/TCP packet
Ether(src="52:00:00:00:00:00",
dst="90:e2:ba:4a:33:5d")/IPv6(src="::1")/TCP(chksum=0xf)/("X"*46)
Step 4 : Recieved packets:
RESULTS:
IPv6/TCP': ['0xd41'] or other unexpected.
EXPECTED RESULTS:
IPv6/TCP': ['0x9f5e']
Daniel Mrzyglod (1):
net: fix build with gcc 4.4.7 and strict aliasing
lib/librte_net/rte_ip.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
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2.5.0
