https://bugs.dpdk.org/show_bug.cgi?id=961
Bug ID: 961
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: dev@dpdk.org
Reporter: i...@cgstowernetworks.com
Target Milestone: ---
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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