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charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM8PR12MB5447.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 73447924-4e81-40d6-3476-08dd32dfd9e9 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Jan 2025 08:05:17.1082 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: xkoMJkzZhHRCpVcG71EFsfNnT1KH+XiTZMoUe46ymgeEpJXZ8UwUlivCVqofplwf2dkQgPUASP2snF4kywaojQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6618 =0A= =0A= On 10/01/2025 20:58, Martin Karsten wrote:=0A= > On 2025-01-10 13:26, Stanislav Fomichev wrote:=0A= >> On 01/10, Joe Damato wrote:=0A= >>> On Mon, Dec 30, 2024 at 09:31:23AM -0500, Joe Damato wrote:=0A= >>>> On Mon, Dec 23, 2024 at 08:17:08AM +0000, Alex Lazar wrote:=0A= >>>>>=0A= >>>=0A= >>> [...]=0A= >>>=0A= >>>>>=0A= >>>>> Hi Joe,=0A= >>>>>=0A= >>>>> Thanks for the quick response.=0A= >>>>> Comments inline, If you need more details or further clarification,= =0A= >>>>> please let me know.=0A= >>>>=0A= >>>> As mentioned above and in my previous emails: please provide lot=0A= >>>> more detail and make it as easy as possible for me to reproduce this= =0A= >>>> issue with the simplest reproducer possible and a much more detailed= =0A= >>>> explanation.=0A= >>>>=0A= >>>> Please note: I will be out of the office until Jan 9 so my responses= =0A= >>>> will be limited until then.=0A= >>>=0A= >>> Just to follow up on this for anyone who missed the other thread,=0A= >>> Stanislav proposed a patch which _might_ fix the issue being hit=0A= >>> here.=0A= >>>=0A= >>> Please see [1], try that patch, and report back if that patch fixes=0A= >>> the issue.=0A= >>>=0A= >>> Thanks.=0A= >>>=0A= >>> [1]: https://lore.kernel.org/netdev/20250109003436.2829560-1- =0A= >>> sdf@fomichev.me/=0A= >>=0A= >> Note that it might help only if xsk is using busy-polling. Not sure=0A= >> that's the case, it's relatively obscure feature :-)=0A= > =0A= > I believe I have reproduced Alex' issue using the methodology below and = =0A= > your patch fixes it for me.=0A= > =0A= > The experiment uses a server (tilly01) with mlx5 and a client (tilly02). = =0A= > In the problem case, the 'response' packet gets stuck, but the next =0A= > 'request' packets triggers both the stuck and the regular responses. The = =0A= > pattern can also be seen in the tcpdump output at the client. Note that = =0A= > the response packet is not a valid packet (only MAC addresses swapped, = =0A= > not IP addresses), but tcpdump shows it regardless.=0A= > =0A= > Thanks,=0A= > Martin=0A= > =0A= > # on server tilly01=0A= > watch -n 0.5 "sudo ethtool -S ens2f1np1 | fgrep tx_xsk_xmit"=0A= > =0A= > # on client tilly02=0A= > sudo tcpdump -qbi eno3d1 udp=0A= > =0A= > # on client tilly02=0A= > while true; do=0A= > =A0 ssh tilly01 "sudo ifconfig ens2f1np1 down; sudo modprobe -r mlx5_ib;= =0A= > =A0=A0=A0 sleep 1; sudo modprobe mlx5_ib; sudo ifconfig ens2f1np1 up"=0A= > =A0 ssh -f tilly01 "sudo ./bpf-examples/AF_XDP-example/xdpsock \=0A= > =A0=A0=A0 -i ens2f1np1 -N -q 4 --l2fwd -z -B >/dev/null 2>&1"=0A= > =A0 exp=3D1=0A= > =A0 for ((i=3D0;i<5;i++)); do=0A= > =A0=A0=A0 ssh tilly01 "sudo ethtool --config-ntuple ens2f1np1 flow-type = udp4\=0A= > =A0=A0=A0=A0=A0 dst-port 19017 action 4 >/dev/null 2>&1"=0A= > =A0=A0=A0 for ((j=3D0;j<10;j++)); do=0A= > =A0=A0=A0=A0=A0 echo -n "$exp "=0A= > =A0=A0=A0=A0=A0 echo 'send(IP(dst=3D"192.168.199.1",src=3D"192.168.199.2= ")\=0A= > =A0=A0=A0=A0=A0=A0=A0 /UDP(dport=3D19017))' | sudo ./scapy/run_scapy >/d= ev/null 2>&1=0A= > =A0=A0=A0=A0=A0 cnt=3D$(ssh tilly01 ethtool -S ens2f1np1|grep -F tx_xsk_= xmit\=0A= > =A0=A0=A0=A0=A0=A0=A0 |cut -f2 -d:)=0A= > =A0=A0=A0=A0=A0 [ $cnt -eq $exp ] || {=0A= > =A0=A0=A0=A0=A0=A0=A0 echo COUNTER WRONG=0A= > =A0=A0=A0=A0=A0=A0=A0 read x=0A= > =A0=A0=A0=A0=A0 }=0A= > =A0=A0=A0=A0=A0 ((exp+=3D1))=0A= > =A0=A0=A0 done=0A= > =A0=A0=A0 ssh tilly01 sudo ethtool --config-ntuple ens2f1np1 delete 1023= =0A= > =A0 done=0A= > =A0 echo reset=0A= > =A0 ssh tilly01 sudo killall xdpsock=0A= > done=0A= > =0A= =0A= Thanks to Joe Martin and Stanislav for introducing this fix and for your = =0A= efforts in solving this issue. I reviewed it over the weekend and =0A= verified that it solves the problem.=0A= =0A= Thanks,=0A= Alex Lazar=0A= =0A=