PCAP PMD receives packets larger then MTU

https://bugs.dpdk.org/show_bug.cgi?id=960

            Bug ID: 960
           Summary: PCAP PMD receives packets larger then MTU
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Created attachment 197
--> https://bugs.dpdk.org/attachment.cgi?id=197&action=edit
pcap with 1 packet ~9000B

Here is example of MTU (max-pkt-len) set to ~300B but driver receives packet of ~9000B (the jumbo pcap is attached)

<code>

root@u18c_9td3:/home/cgs/workspace/master/jumbo# ./dpdk-testpmd --no-huge
-m1024 -l 0-3 -n 4 --vdev
'net_pcap0,rx_pcap=jumbo_9000.pcap,tx_pcap=file_tx.pcap' -- --no-flush-rx
--total-num-mbufs=2048  --max-pkt-len=300 -i
EAL: Detected CPU lcores: 6
EAL: Detected NUMA nodes: 1
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
Interactive-mode selected
Warning: NUMA should be configured manually by using --port-numa-config and
--ring-numa-config parameters along with --numa.
testpmd: create a new mbuf pool <mb_pool_0>: n=2048, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc

Warning! port-topology=paired and odd forward ports number, the last port will pair with itself.

Configuring Port 0 (socket 0)
Port 0: 02:70:63:61:70:00
Checking link statuses...
Done
testpmd> show port info 0

********************* Infos for port 0 *********************
MAC address: 02:70:63:61:70:00
Device name: net_pcap0
Driver name: net_pcap
Firmware-version: not available
Devargs: rx_pcap=jumbo_9000.pcap,tx_pcap=file_tx.pcap
Connect to socket: 0
memory allocation on the socket: 0
Link status: up
Link speed: 10 Gbps
Link duplex: full-duplex
Autoneg status: Off
MTU: 282
Promiscuous mode: enabled
Allmulticast mode: enabled
Maximum number of MAC addresses: 1
Maximum number of MAC addresses of hash filtering: 0
VLAN offload:
strip off, filter off, extend off, qinq strip off
No RSS offload flow type is supported.
Minimum size of RX buffer: 0
Maximum configurable length of RX packet: 4294967295
Maximum configurable size of LRO aggregated packet: 0
Current number of RX queues: 1
Max possible RX queues: 1
Max possible number of RXDs per queue: 65535
Min possible number of RXDs per queue: 0
RXDs number alignment: 1
Current number of TX queues: 1
Max possible TX queues: 1
Max possible number of TXDs per queue: 65535
Min possible number of TXDs per queue: 0
TXDs number alignment: 1
Max segment number per packet: 65535
Max segment number per MTU/TSO: 65535
Device capabilities: 0x0( )
testpmd> set verbose 3
Change verbose level from 0 to 3
testpmd> start
io packet forwarding - ports=1 - cores=1 - streams=1 - NUMA support enabled, MP allocation mode: native
Logical Core 1 (socket 0) forwards packets on 1 streams:
RX P=0/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00

io packet forwarding packets/burst=32
nb forwarding cores=1 - nb forwarding ports=1
port 0: RX queue number: 1 Tx queue number: 1
Rx offloads=0x0 Tx offloads=0x0
RX queue: 0
RX desc=0 - RX free threshold=0
RX threshold registers: pthresh=0 hthresh=0 wthresh=0
RX Offloads=0x0
TX queue: 0
TX desc=0 - TX free threshold=0
TX threshold registers: pthresh=0 hthresh=0 wthresh=0
TX offloads=0x0 - TX RS bit threshold=0
testpmd> port 0/queue 0: received 1 packets
src=04:F4:BC:3E:E4:25 - dst=00:00:00:00:00:00 - type=0x0800 - length=8996 -
nb_segs=5 - timestamp 1266577613728443 - sw ptype: L2_ETHER L3_IPV4 - l2_len=14 - l3_len=20 - Receive queue=0x0
ol_flags: RTE_MBUF_F_RX_L4_CKSUM_UNKNOWN RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN
RTE_MBUF_F_RX_OUTER_L4_CKSUM_UNKNOWN
port 0/queue 0: sent 1 packets
src=04:F4:BC:3E:E4:25 - dst=00:00:00:00:00:00 - type=0x0800 - length=8996 -
nb_segs=5 - timestamp 1266577613728443 - sw ptype: L2_ETHER L3_IPV4 - l2_len=14 - l3_len=20 - Send queue=0x0
ol_flags: RTE_MBUF_F_TX_L4_NO_CKSUM

testpmd> stop
Telling cores to stop...
Waiting for lcores to finish...

---------------------- Forward statistics for port 0 ----------------------

  RX-packets: 1              RX-dropped: 0             RX-total: 1
  TX-packets: 1              TX-dropped: 0             TX-total: 1

----------------------------------------------------------------------------

+++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++

  RX-packets: 1              RX-dropped: 0             RX-total: 1
  TX-packets: 1              TX-dropped: 0             TX-total: 1

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.
testpmd> show port stats 0

######################## NIC statistics for port 0 ########################
RX-packets: 1 RX-missed: 0 RX-bytes: 8996
RX-errors: 0
RX-nombuf: 0
TX-packets: 1 TX-errors: 0 TX-bytes: 8996

Throughput (since last show)

  Rx-pps:            0          Rx-bps:            0
  Tx-pps:            0          Tx-bps:            0

############################################################################
testpmd> quit

Stopping port 0...
Stopping ports...
Done

Shutting down port 0...
Closing ports...
Port 0 is closed
Done

Bye...

There's further issues for apps (non test-pmd) that use pcap driver as they may unexpectedly get segmented mbufs w/o setting RTE_ETH_RX_OFFLOAD_SCATTER

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