[PATCH net v2] net: ti: icssg-prueth: Fix skb handling for XDP_PASS

Meghana Malladi
2025-08-03T18:03:21Z

emac_rx_packet() is a common function for handling traffic
for both xdp and non-xdp use cases. Use common logic for
handling skb with or without xdp to prevent any incorrect
packet processing. This patch fixes ping working with
XDP_PASS for icssg driver.

Fixes: 62aa3246f4623 ("net: ti: icssg-prueth: Add XDP support")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
---

v2-v1:
- Collected RB tag from Jacob Keller <jacob.e.keller@intel.com>
- Populated headroom from xdp buffer instead of hardcoding as
pointed out by Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/icssg/icssg_common.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index 12f25cec6255..57e5f1c88f50 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -706,9 +706,9 @@ static int emac_rx_packet(struct prueth_emac *emac, u32 flow_id, u32 *xdp_state)
struct page_pool *pool;
struct sk_buff *skb;
struct xdp_buff xdp;
+ int headroom, ret;
u32 *psdata;
void *pa;
- int ret;

*xdp_state = 0;
pool = rx_chn->pg_pool;
@@ -757,22 +757,23 @@ static int emac_rx_packet(struct prueth_emac *emac, u32 flow_id, u32 *xdp_state)
xdp_prepare_buff(&xdp, pa, PRUETH_HEADROOM, pkt_len, false);

*xdp_state = emac_run_xdp(emac, &xdp, page, &pkt_len);
- if (*xdp_state == ICSSG_XDP_PASS)
- skb = xdp_build_skb_from_buff(&xdp);
- else
+ if (*xdp_state != ICSSG_XDP_PASS)
goto requeue;
+ headroom = xdp.data - xdp.data_hard_start;
+ pkt_len = xdp.data_end - xdp.data;
} else {
- /* prepare skb and send to n/w stack */
- skb = napi_build_skb(pa, PAGE_SIZE);
+ headroom = PRUETH_HEADROOM;
}

+ /* prepare skb and send to n/w stack */
+ skb = napi_build_skb(pa, PAGE_SIZE);
if (!skb) {
ndev->stats.rx_dropped++;
page_pool_recycle_direct(pool, page);
goto requeue;
}

- skb_reserve(skb, PRUETH_HEADROOM);
+ skb_reserve(skb, headroom);
skb_put(skb, pkt_len);
skb->dev = ndev;

base-commit: 759dfc7d04bab1b0b86113f1164dc1fec192b859
--
2.43.0