netdev - [RFC bpf-next 0/6] net: xsk: minor improvements around queue handling

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Message-Id: <20180726214148.2087-1-jakub.kicinski@netronome.com>
Date:   Thu, 26 Jul 2018 14:41:42 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     alexei.starovoitov@...il.com, daniel@...earbox.net,
        brouer@...hat.com,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [RFC bpf-next 0/6] net: xsk: minor improvements around queue handling

Hi!

This set tries to make the core take care of error checking for the
drivers.  In particular making sure that the AF_XDP UMEM is not installed
on queues which don't exist (or are disabled) and that changing queue
(AKA ethtool channel) count cannot disable queues with active AF_XDF
zero-copy sockets.

I'm sending as an RFC because I'm not entirely sure what the desired
behaviour is here.  Is it Okay to install AF_XDP on queues which don't
exist?  I presume not?  Are the AF_XDP queue_ids referring to TX queues
as well as RX queues in case of the driver?  I presume not?  Should
we try to prevent disabling queues which have non zero-copy sockets
installed as well? :S

Anyway, if any of those patches seem useful and reasonable, please let
me know I will repost as non-RFC.

Jakub Kicinski (6):
  net: update real_num_rx_queues even when !CONFIG_SYSFS
  xsk: refactor xdp_umem_assign_dev()
  xsk: don't allow umem replace at stack level
  xsk: don't allow installing UMEM beyond the number of queues
  ethtool: rename local variable max -> curr
  ethtool: don't allow disabling queues with umem installed

 include/linux/netdevice.h | 16 +++++++--
 net/core/ethtool.c        | 19 ++++++----
 net/xdp/xdp_umem.c        | 73 ++++++++++++++++++++++++---------------
 3 files changed, 71 insertions(+), 37 deletions(-)

-- 
2.17.1