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From: Srivats P <pstavirs@gmail.com>
To: Xdp <xdp-newbies@vger.kernel.org>
Subject: AF_XDP sendto kick returning EPERM
Date: Fri, 23 Apr 2021 21:14:05 +0530	[thread overview]
Message-ID: <CANzUK58=fjW-iqBqm6drSfC679T0C+68bRj8BzxqrTYWAzDHJg@mail.gmail.com> (raw)

Hi,

I'm using sendto() to kick tx in my AF_XDP program after I submit
descriptors to the tx ring -

ret = sendto(xsk_socket__fd(xsk_), NULL, 0, MSG_DONTWAIT, NULL, 0);

However, I'm receiving EPERM as the return value every time. AFAIK
this is not an expected return value. Since this is with i40e, I
checked i40e_xsk_wakeup() - but that also doesn't return EPERM. I am
running as root and I don't see any problems with creating the xsk,
configuring umem etc.

Also, no packets seem to go out either.

# uname -a
Linux Ostinato-1 5.11.15-1-default #1 SMP Fri Apr 16 16:47:34 UTC 2021
(64fb5bf) x86_64 x86_64 x86_64 GNU/Linux

I don't see the problem on another machine with i40e but older kernel 5.4 series

Any suggestions on what to look for or how to proceed?

Srivats

             reply	other threads:[~2021-04-23 15:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 15:44 Srivats P [this message]
2021-04-27  7:28 ` AF_XDP sendto kick returning EPERM Magnus Karlsson
2021-04-29 15:47   ` Srivats P
2021-05-03  8:24     ` Magnus Karlsson
2021-05-07 14:47       ` Srivats P
2021-05-07 15:09         ` Srivats P
2021-05-09 15:41           ` Maciej Fijalkowski
2021-05-11 12:02             ` Srivats P

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