netdev - [PATCH net 0/2] intel: Interpret .set

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Message-Id: <20240514-iwl-net-2024-05-14-set-channels-fixes-v1-0-eb18d88e30c3@intel.com>
Date: Tue, 14 May 2024 11:51:11 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: netdev <netdev@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>, 
 David Miller <davem@...emloft.net>
Cc: Jacob Keller <jacob.e.keller@...el.com>, 
 Larysa Zaremba <larysa.zaremba@...el.com>, 
 Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>, 
 Chandan Kumar Rout <chandanx.rout@...el.com>, 
 Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>, 
 Maciej Fijalkowski <maciej.fijalkowski@...el.com>, 
 Przemek Kitszel <przemyslaw.kitszel@...el.com>, 
 Igor Bagnucki <igor.bagnucki@...el.com>, 
 Krishneil Singh <krishneil.k.singh@...el.com>, 
 Simon Horman <horms@...nel.org>
Subject: [PATCH net 0/2] intel: Interpret .set_channels() input differently

The ice and idpf drivers can trigger a crash with AF_XDP due to incorrect
interpretation of the asymmetric Tx and Rx parameters in their
.set_channels() implementations:

1. ethtool -l <IFNAME> -> combined: 40
2. Attach AF_XDP to queue 30
3. ethtool -L <IFNAME> rx 15 tx 15
   combined number is not specified, so command becomes {rx_count = 15,
   tx_count = 15, combined_count = 40}.
4. ethnl_set_channels checks, if there are any AF_XDP of queues from the
   new (combined_count + rx_count) to the old one, so from 55 to 40, check
   does not trigger.
5. the driver interprets `rx 15 tx 15` as 15 combined channels and deletes
   the queue that AF_XDP is attached to.

This is fundamentally a problem with interpreting a request for asymmetric
queues as symmetric combined queues.

Fix the ice and idpf drivers to stop interpreting such requests as a
request for combined queues. Due to current driver design for both ice and
idpf, it is not possible to support requests of the same count of Tx and Rx
queues with independent interrupts, (i.e. ethtool -L <IFNAME> rx 15 tx 15)
so such requests are now rejected.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
Larysa Zaremba (2):
      ice: Interpret .set_channels() input differently
      idpf: Interpret .set_channels() input differently

 drivers/net/ethernet/intel/ice/ice_ethtool.c   | 22 ++++++----------------
 drivers/net/ethernet/intel/idpf/idpf_ethtool.c | 21 ++++++---------------
 2 files changed, 12 insertions(+), 31 deletions(-)
---
base-commit: aea27a92a41dae14843f92c79e9e42d8f570105c
change-id: 20240514-iwl-net-2024-05-14-set-channels-fixes-25be6f04a86d

Best regards,
-- 
Jacob Keller <jacob.e.keller@...el.com>