net: ti: icssg: Use undirected TX tag for XDP zero copy in HSR offload mode

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emac_xsk_xmit_zc() has the same issue as the fixed emac_xmit_xdp_frame():
it always sets the CPPI5 descriptor destination tag to emac->port_id,
which directs the PRU firmware to transmit on only one slave port in HSR
mode, breaking redundancy.

Apply the same fix: in HSR offload mode when NETIF_F_HW_HSR_DUP is set,
use PRUETH_UNDIRECTED_PKT_DST_TAG (port 0) so the PRU duplicates frames
to both ports. Also set PRUETH_UNDIRECTED_PKT_TAG_INS when
NETIF_F_HW_HSR_TAG_INS is set so the PRU re-inserts the HSR sequence tag
that was stripped by the PRU on RX before the XDP program saw the frame.

This ensures XSK XDP_TX frames in HSR mode are treated identically to
skb TX via hsr0.

Fixes: 8756ef2eb0 ("net: ti: icssg-prueth: Add AF_XDP zero copy for TX")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Link: https://patch.msgid.link/20260611185744.2498070-4-m-malladi@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Meghana Malladi 2026-06-12 00:27:43 +05:30 • committed by Jakub Kicinski

parent bcbf73d981

commit f969128841

1 changed files with 11 additions and 2 deletions

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13

drivers/net/ethernet/ti/icssg/icssg_common.c

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