bnxt PMD: multicast filtering fails

Bug 891 [email protected] 1 participant 1 message Nov 26, 2021

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2021-11-26 12:52 UTC #0 lore raw

https://bugs.dpdk.org/show_bug.cgi?id=891

            Bug ID: 891
           Summary: bnxt PMD: multicast filtering fails
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

On Broadcom bnxt PF, multicast packets reception is successful only if the multicast mac address of the packets is the first one in the multicast address list of the port.

test: using Testpmd and DPDK version: 20.11.3

*** Test configuration ***
1/ Bind the device to the kernel modules vfio-pci
./dpdk-devbind.py -b vfio-pci 0000:08:00.1
./dpdk-devbind.py -b vfio-pci 0000:08:00.0

2/Launch the app testpmd with the following arguments:
./dpdk-testpmd --log-level=pmd.net.bnxt.driver:8 -l 1,2 -a 0000:08:00.0 -a
0000:08:00.1 -- -i --rxq=1 --txq=1 --coremask=0x04 --total-num-mbufs=250000

testpmd> set fwd rxonly
testpmd> set verbose 1
testpmd> start
testpmd> set promisc all off
testpmd> set allmulti all off

*** Test steps ***

1/ step 1:
** check multicast address list of the ports
testpmd> show port 1 mcast_macs
Number of Multicast MAC address added: 0
testpmd> show port 0 mcast_macs
Number of Multicast MAC address added: 0

** Configure multicast address:
testpmd> mcast_addr add 1 33:33:00:10:00:01
testpmd> show port 1 mcast_macs
Number of Multicast MAC address added: 1
33:33:00:10:00:01

** From a second machine: send the following packet using scapy:
scapy file:
p = Ether(dst='33:33:00:10:00:01', src='ec:0d:9a:37:d1:7b')/IPv6(nh=59, src='fd00:200::2', dst='ff05::10:10:2')/Raw(load=b'kqi1Br') sendp(p, iface='ntfp2', count=5, inter=0.5)

** Result:
testpmd> port 1/queue 0: received 1 packets
src=EC:0D:9A:37:D1:7B - dst=33:33:00:10:00:01 - type=0x86dd - lengt
h=60 - nb_segs=1 - hw ptype: L2_ETHER L3_IPV6_EXT_UNKNOWN - sw ptype : L2_ETHER L3_IPV6 - l2_len=14 - l3_len=40 - Receive queue=0x0
ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_GOOD PKT_RX_OUTER
_L4_CKSUM_UNKNOWN
port 1/queue 0: received 1 packets
src=EC:0D:9A:37:D1:7B - dst=33:33:00:10:00:01 - type=0x86dd - lengt
h=60 - nb_segs=1 - hw ptype: L2_ETHER L3_IPV6_EXT_UNKNOWN - sw ptype : L2_ETHER L3_IPV6 - l2_len=14 - l3_len=40 - Receive queue=0x0
ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_GOOD PKT_RX_OUTER
_L4_CKSUM_UNKNOWN

==> All packets are received on the main machine: Test is successful

PS: ec:0d:9a:37:d1:7 : mac address of the second machine port ntfp2

2/ step 2 : Add more multicast addresses to port 1 (maintain 33:33:00:10:00:01 in the first position of the list) and send the same packets again:

testpmd> show port 1 mcast_macs
Number of Multicast MAC address added: 5
33:33:00:10:00:01
33:33:00:10:00:02
33:33:00:10:00:03
33:33:00:10:00:04
33:33:00:10:00:05

==> All packets are received on the main machine: Test is successful

3/ step 3: Change the order of multicast addresses & resend the same packets

testpmd> mcast_addr remove 1 33:33:00:10:00:01
testpmd> show port 1 mcast_macs
Number of Multicast MAC address added: 4
33:33:00:10:00:02
33:33:00:10:00:03
33:33:00:10:00:04
33:33:00:10:00:05
testpmd> mcast_addr add 1 33:33:00:10:00:01
testpmd> show port 1 mcast_macs
Number of Multicast MAC address added: 5
33:33:00:10:00:02
33:33:00:10:00:03
33:33:00:10:00:04
33:33:00:10:00:05
33:33:00:10:00:01

** Result:
testpmd>

==> No packet is received: Test fails.

FYI:
The same test was applied using dpdk version 21.11 git link: https://github.com/DPDK/dpdk
branch: main
commit: 779279afa579570f4e62b708895fa52de1bee471 latest tag : v21.11-rc4

=> the test shows the same results

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