[v4,iwl-net,0/8] ice: fix AF_XDP ZC timeout and concurrency issues

Message

Maciej Fijalkowski June 27, 2024, 1:17 p.m. UTC

Hi,

changes included in this patchset address an issue that customer has
been facing when AF_XDP ZC Tx sockets were used in combination with flow
control and regular Tx traffic.

After executing:
ethtool --set-priv-flags $dev link-down-on-close on
ethtool -A $dev rx on tx on

launching multiple ZC Tx sockets on $dev + pinging remote interface (so
that regular Tx traffic is present) and then going through down/up of
$dev, Tx timeout occured and then most of the time ice driver was unable
to recover from that state.

These patches combined together solve the described above issue on
customer side. Main focus here is to forbid producing Tx descriptors
when either carrier is not yet initialized or process of bringing
interface down has already started.

Olek,
we decided not to check IFF_UP as you initially suggested. Reason is
that when link goes down netif_running() has broader scope than IFF_UP
being set as the former (the __LINK_STATE_START bit) is cleared earlier
in the core.

Thanks,
Maciej

v3-v4:
- turn carrier on in ice_qp_ena() only when physical link is up [Michal]

v2->v3:
- drop redundant braces in patch 3 [Shannon]
- fix naming of ice_xsk_pool() in patch 6 [Shannon]
- add review and test tags

v1->v2:
- fix kdoc issues in patch 6 and 8
- drop Larysa's patches for now


Maciej Fijalkowski (7):
  ice: don't busy wait for Rx queue disable in ice_qp_dis()
  ice: replace synchronize_rcu with synchronize_net
  ice: modify error handling when setting XSK pool in ndo_bpf
  ice: toggle netif_carrier when setting up XSK pool
  ice: improve updating ice_{t,r}x_ring::xsk_pool
  ice: add missing WRITE_ONCE when clearing ice_rx_ring::xdp_prog
  ice: xsk: fix txq interrupt mapping

Michal Kubiak (1):
  ice: respect netif readiness in AF_XDP ZC related ndo's

 drivers/net/ethernet/intel/ice/ice.h      |  11 +-
 drivers/net/ethernet/intel/ice/ice_base.c |   4 +-
 drivers/net/ethernet/intel/ice/ice_main.c |   2 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c |   6 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c  | 159 +++++++++++++---------
 drivers/net/ethernet/intel/ice/ice_xsk.h  |   4 +-
 6 files changed, 109 insertions(+), 77 deletions(-)