[Bug 891] bnxt PMD: multicast filtering fails

[Bug 891] bnxt PMD: multicast filtering fails

[bugzilla]

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: dev@dpdk.org
          Reporter: siwar.zitouni@6wind.com
  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

** 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      

==> 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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