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| author | Björn Töpel <bjorn.topel@intel.com> | 2019-02-14 14:03:02 +0100 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2019-02-21 11:07:49 -0800 |
| commit | 59eb2a884f5380011179acc4662fc2cc2d850454 (patch) | |
| tree | e2d1a2c7fd0d379dfe6bf09a44e1ab3e7e1f648e /drivers/fpga/altera-hps2fpga.c | |
| parent | 4a9b32f30f805ca596d76605903a48eab58e0b88 (diff) | |
i40e: fix XDP_REDIRECT/XDP xmit ring cleanup race
When the driver clears the XDP xmit ring due to re-configuration or
teardown, in-progress ndo_xdp_xmit must be taken into consideration.
The ndo_xdp_xmit function is typically called from a NAPI context that
the driver does not control. Therefore, we must be careful not to
clear the XDP ring, while the call is on-going. This patch adds a
synchronize_rcu() to wait for napi(s) (preempt-disable regions and
softirqs), prior clearing the queue. Further, the __I40E_CONFIG_BUSY
flag is checked in the ndo_xdp_xmit implementation to avoid touching
the XDP xmit queue during re-configuration.
Fixes: d9314c474d4f ("i40e: add support for XDP_REDIRECT")
Fixes: 123cecd427b6 ("i40e: added queue pair disable/enable functions")
Reported-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/fpga/altera-hps2fpga.c')
0 files changed, 0 insertions, 0 deletions