Description of problem: mlx5_core driver: testpmd start failed when the max-pkt-len is larger than 2100 Version-Release number of selected component (if applicable): [root@dell-per730-56 ~]# uname -r 5.14.0-284.26.1.el9_2.x86_64 [root@dell-per730-56 ~]# rpm -qa|grep dpdk dpdk-22.11-1.el9.x86_64 dpdk-tools-22.11-1.el9.x86_64 How reproducible: Steps to Reproduce: 1. create one vf for two pf [root@dell-per730-56 ~]# echo 1 > /sys/devices/pci0000:00/0000:00:02.0/0000:04:00.0/sriov_numvfs [root@dell-per730-56 ~]# echo 1 > /sys/devices/pci0000:00/0000:00:02.0/0000:04:00.1/sriov_numvfs [root@dell-per730-56 ~]# ip a 6: enp4s0f0np0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9200 qdisc mq state UP mode DEFAULT group default qlen 1000 link/ether ec:0d:9a:a0:1e:54 brd ff:ff:ff:ff:ff:ff vf 0 link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff, spoof checking off, link-state auto, trust off, query_rss off 7: enp4s0f1np1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9200 qdisc mq state UP mode DEFAULT group default qlen 1000 link/ether ec:0d:9a:a0:1e:55 brd ff:ff:ff:ff:ff:ff vf 0 link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff, spoof checking off, link-state auto, trust off, query_rss off 2. configure mtu of pf and vf port to 9200 [root@dell-per730-56 ~]# ip link set enp4s0f0np0 mtu 9200 [root@dell-per730-56 ~]# ip link set enp4s0f1np1 mtu 9200 [root@dell-per730-56 ~]# ip link set dev enp4s0f0v0 mtu 9200 [root@dell-per730-56 ~]# ip link set dev enp4s0f1v0 mtu 9200 3. start testpmd with -max-pkt-len=2100 and -max-pkt-len=9200 [root@dell-per730-56 ~]# dpdk-testpmd -l 0,1,2,3,4 -n 4 -a 0000:04:00.2 -a 0000:04:04.2 --socket-mem 4096,4096 -- -i --numa --max-pkt-len=2100 EAL: Detected CPU lcores: 48 EAL: Detected NUMA nodes: 2 EAL: Detected shared linkage of DPDK EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'VA' EAL: VFIO support initialized EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:00.2 (socket 0) EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:04.2 (socket 0) TELEMETRY: No legacy callbacks, legacy socket not created Interactive-mode selected testpmd: create a new mbuf pool <mb_pool_0>: n=179456, size=2176, socket=0 testpmd: preferred mempool ops selected: ring_mp_mc testpmd: create a new mbuf pool <mb_pool_1>: n=179456, size=2176, socket=1 testpmd: preferred mempool ops selected: ring_mp_mc Configuring Port 0 (socket 0) mlx5_net: port 0 Rx queue 0: Scatter offload is not configured and no enough mbuf space(2176) to contain the maximum RX packet length(2100) with head-room(128) mlx5_net: port 0 unable to allocate rx queue index 0 Fail to configure port 0 rx queues EAL: Error - exiting with code: 1 Cause: Start ports failed Port 0 is closed Port 1 is closed [root@dell-per730-56 ~]# dpdk-testpmd -l 0,1,2,3,4 -n 4 -a 0000:04:00.2 -a 0000:04:04.2 --socket-mem 4096,4096 -- -i --numa --max-pkt-len=9200 EAL: Detected CPU lcores: 48 EAL: Detected NUMA nodes: 2 EAL: Detected shared linkage of DPDK EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'VA' EAL: VFIO support initialized EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:00.2 (socket 0) EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:04.2 (socket 0) TELEMETRY: No legacy callbacks, legacy socket not created Interactive-mode selected testpmd: create a new mbuf pool <mb_pool_0>: n=179456, size=2176, socket=0 testpmd: preferred mempool ops selected: ring_mp_mc testpmd: create a new mbuf pool <mb_pool_1>: n=179456, size=2176, socket=1 testpmd: preferred mempool ops selected: ring_mp_mc Configuring Port 0 (socket 0) mlx5_net: port 0 Rx queue 0: Scatter offload is not configured and no enough mbuf space(2176) to contain the maximum RX packet length(9200) with head-room(128) mlx5_net: port 0 unable to allocate rx queue index 0 Fail to configure port 0 rx queues EAL: Error - exiting with code: 1 Cause: Start ports failed Port 0 is closed Port 1 is closed [root@dell-per730-56 ~]# dpdk-testpmd -l 0,1,2,3,4 -n 4 -a 0000:04:00.2 -a 0000:04:04.2 --socket-mem 4096,4096 -- -i --numa --max-pkt-len=2000 EAL: Detected CPU lcores: 48 EAL: Detected NUMA nodes: 2 EAL: Detected shared linkage of DPDK EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'VA' EAL: VFIO support initialized EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:00.2 (socket 0) EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:04:04.2 (socket 0) TELEMETRY: No legacy callbacks, legacy socket not created Interactive-mode selected testpmd: create a new mbuf pool <mb_pool_0>: n=179456, size=2176, socket=0 testpmd: preferred mempool ops selected: ring_mp_mc testpmd: create a new mbuf pool <mb_pool_1>: n=179456, size=2176, socket=1 testpmd: preferred mempool ops selected: ring_mp_mc Configuring Port 0 (socket 0) Port 0: 16:D9:63:AD:01:4D Configuring Port 1 (socket 0) Port 1: C2:B5:2A:38:1F:BD Checking link statuses... Done testpmd> Actual results: testpmd start with --max-pkt-len=2100 failed. testpmd start with --max-pkt-len=2000 successfully. Expected results: testpmd start with --max-pkt-len=2100 should be successfully. Additional info: