This patch addresses the issue where the igc_xsk_wakeup function
was triggering an incorrect IRQ for tx-0 when the i226 is configured
with only 2 combined queues or in an environment with 2 active CPU cores.
This prevented XDP Zero-copy send functionality in such split IRQ
configurations.

The fix implements the correct logic for extracting q_vectors saved
during rx and tx ring allocation and utilizes flags provided by the
ndo_xsk_wakeup API to trigger the appropriate IRQ.

Fixes: fc9df2a0b520 ("igc: Enable RX via AF_XDP zero-copy")
Fixes: 15fd021bc427 ("igc: Add Tx hardware timestamp request for AF_XDP zero-copy packet")
Signed-off-by: Vivek Behera <vivek.behera@siemens.com>
Reviewed-by: Jacob Keller <jacob.keller@intel.com>
Reviewed-by: Aleksandr loktinov <aleksandr.loktionov@intel.com>
Reviewed-by: Piotr Kwapulinski <piotr.kwapulinski@intel.com>
---
v1: https://lore.kernel.org/intel-wired-lan/AS1PR10MB5392B7268416DB8A1624FDB88FA7A@AS1PR10MB5392.EURPRD10.PROD.OUTLOOK.COM/
v2: https://lore.kernel.org/intel-wired-lan/AS1PR10MB539280B1427DA0ABE9D65E628FA5A@AS1PR10MB5392.EURPRD10.PROD.OUTLOOK.COM/
v3: https://lore.kernel.org/intel-wired-lan/IA3PR11MB8986E4ACB7F264CF2DD1D750E5A0A@IA3PR11MB8986.namprd11.prod.outlook.com/
v4: https://lore.kernel.org/intel-wired-lan/AS1PR10MB53926CB955FBD4F9F4A018818FA0A@AS1PR10MB5392.EURPRD10.PROD.OUTLOOK.COM/
v5: https://lore.kernel.org/intel-wired-lan/AS1PR10MB5392FCA415A38B9DD7BB5F218FA0A@AS1PR10MB5392.EURPRD10.PROD.OUTLOOK.COM/
v6: https://lore.kernel.org/intel-wired-lan/20251211173916.23951-1-vivek.behera@siemens.com/
v7: https://lore.kernel.org/intel-wired-lan/20251212163208.137164-1-vivek.behera@siemens.com/
v8: https://lore.kernel.org/intel-wired-lan/20251215122052.412327-1-vivek.behera@siemens.com/
v9: https://lore.kernel.org/intel-wired-lan/20251220110009.137245-1-vivek.behera@siemens.com/
v10: https://lore.kernel.org/intel-wired-lan/20260117150753.2088857-1-vivek.behera@siemens.com/
changelog:
v1
- Inital description of the Bug and steps to reproduce with RTC Testbench
- Test results after applying the patch
v1 -> v2
- Handling of RX and TX Wakeup in igc_xsk_wakeup for a split IRQ configuration
- Removal of igc_trigger_rxtxq_interrupt (now redundant)
- Added flag to igc_xsk_wakeup function call in igc_ptp_free_tx_buffer
v2 -> v3
- Added 'Fixes:' tags for the relevant commits.
- Added reviewer
v3 -> v4
- Added reviewer
v4 -> v5
- Updated comment style from multi-star to standard linux convention
v5 -> v6
- Resolve formatting issues highlighted by reviewers
- Try to include version histroy as defined in netdev guidelines
- Included review suggestions from Przemyslaw
- Added reviewers
v6 -> v7
- Included review suggestions from Przemyslaw missed in v6
v7 -> v8
- Modified sequence to complete all error checks for rx and tx
  before updating napi states and triggering irq
v8 -> v9
- Included review feedback and suggestions from Tony and Siang
v9 -> v10
- Introduced a simplified logic for sequential check for RX and TX
v10 -> v11
- Improved explanation of implemented logic in comment block
---
 drivers/net/ethernet/intel/igc/igc_main.c | 34 ++++++++++++++++-------
 drivers/net/ethernet/intel/igc/igc_ptp.c  |  3 +-
 2 files changed, 26 insertions(+), 11 deletions(-)

Tested-by: Avigail Dahan <avigailx.dahan@intel.com>