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igc: skip RX timestamp header for frame preemption verification

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When RX hardware timestamping is enabled, a 16-byte inline timestamp header
is added to the start of the packet buffer, causing FPE handshake
verification to fail.

Because an incorrect packet buffer is passed to igc_fpe_handle_mpacket(),
the mem_is_zero() check inspects the timestamp metadata instead of the
actual mPacket payload. As a result, valid Verify/Response mPackets can be
missed when inline RX timestamps are present.

Pass pktbuf + pkt_offset to igc_fpe_handle_mpacket() so it inspects the
actual mPacket payload instead of the timestamp header.

Fixes: 5422570c00 ("igc: add support for frame preemption verification")
Co-developed-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
Signed-off-by: KhaiWenTan <khai.wen.tan@linux.intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
KhaiWenTan 2026-04-24 15:59:07 +08:00 committed by Tony Nguyen
parent 7bd4355272
commit 38b7a274cf
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/igc/igc_main.c
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@ -2649,7 +2649,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
}
if (igc_fpe_is_pmac_enabled(adapter) &&
igc_fpe_handle_mpacket(adapter, rx_desc, size, pktbuf)) {
igc_fpe_handle_mpacket(adapter, rx_desc, size, pktbuf + pkt_offset)) {
/* Advance the ring next-to-clean */
igc_is_non_eop(rx_ring, rx_desc);
cleaned_count++;