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-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1854842 Title: mlx5_core reports hardware checksum error for padded packets on Mellanox NICs Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: Fix Committed Bug description: BugLink: https://bugs.launchpad.net/bugs/1854842 [Impact] On machines equipped with Mellanox NIC's, in this particular case, Mellanox 5 series NICs using the mlx5_core driver, there is a kernel splat when sending large IP packets which have padding at the end. enp6s0f0: hw csum failure CPU: 19 PID: 0 Comm: swapper/19 Not tainted 4.15.0-72-generic Call Trace: <IRQ> dump_stack+0x63/0x8e netdev_rx_csum_fault+0x38/0x40 __skb_checksum_complete+0xbc/0xd0 nf_ip_checksum+0xc3/0xf0 icmp_error+0x27d/0x310 [nf_conntrack_ipv4] nf_conntrack_in+0x15a/0x510 [nf_conntrack] ? __skb_checksum+0x68/0x330 ipv4_conntrack_in+0x1c/0x20 [nf_conntrack_ipv4] nf_hook_slow+0x48/0xc0 ? skb_send_sock+0x50/0x50 ip_rcv+0x301/0x360 ? inet_del_offload+0x40/0x40 __netif_receive_skb_core+0x432/0xb80 __netif_receive_skb+0x18/0x60 ? __netif_receive_skb+0x18/0x60 netif_receive_skb_internal+0x45/0xe0 napi_gro_receive+0xc5/0xf0 mlx5e_handle_rx_cqe+0x48d/0x5e0 [mlx5_core] ? enqueue_task_rt+0x1b4/0x2e0 mlx5e_poll_rx_cq+0xd1/0x8c0 [mlx5_core] mlx5e_napi_poll+0x9d/0x290 [mlx5_core] net_rx_action+0x140/0x3a0 __do_softirq+0xe4/0x2d4 irq_exit+0xc5/0xd0 do_IRQ+0x86/0xe0 common_interrupt+0x8c/0x8c </IRQ> This bug is a further attempt to fix these splats, as there has been previous fixes in LP #1840854 and a series of commits which landed in 4.15.0-67 (LP #1847155) as a part of upstream -stable patches. This bug will also fix the same problems on the new Mellanox CX6 and Bluefield hardware, which has been enabled already via previous upstream -stable patches which landed in LP #1847155. [Fix] This particular issue was fixed for Mellanox series 5 drivers in the following commits: commit 0aa1d18615c163f92935b806dcaff9157645233a Author: Saeed Mahameed <sae...@mellanox.com> Date: Tue Mar 12 00:24:52 2019 -0700 Subject: net/mlx5e: Rx, Fixup skb checksum for packets with tail padding This commit required a minor backport. This commit was selected for upstream -stable in 4.19.76 and 5.0.10. This commit appears to be omitted from "Bionic update: upstream stable patchset 2019-10-07", which is LP #1847155, probably due to requiring a backport. commit db849faa9bef993a1379dc510623f750a72fa7ce Author: Saeed Mahameed <sae...@mellanox.com> Date: Fri May 3 13:14:59 2019 -0700 Subject: net/mlx5e: Rx, Fix checksum calculation for new hardware This commit required a minor backport. This commit was selected for upstream -stable in 5.1.21 and 5.2.4. This commit has already been applied to the disco kernel, as part of stable updates. [Testcase] The following scapy script will reproduce this issue. Run from the machine with the Mellanox series 5 NIC: 1) a=Ether(dst='ff:ff:ff:ff:ff:ff')/IP(dst='127.0.0.1')/ICMP()/Padding(load='\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe') 2) sendp(a, iface='enp6s0f0') 3) Check dmesg on the reciever side. The example uses localhost, so check dmesg. I have built some test kernels, which are available here: https://launchpad.net/~mruffell/+archive/ubuntu/lp1854842-test This kernel contains 0aa1d18615c163f92935b806dcaff9157645233a. and https://launchpad.net/~mruffell/+archive/ubuntu/lp1854842-test-2 This kernel contains db849faa9bef993a1379dc510623f750a72fa7ce. If you install the test kernels the issue is resolved. [Regression Potential] The changes are limited to the mlx5_core driver, and only modify how packet checksums are calculated when padding is involved. Both patches have been accepted and published by upstream -stable, and are widely accepted by the community. Because of this, I believe the risk of regression is low. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1854842/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
