[Intel-wired-lan] [PATCH iwl-next v2 1/2] igc: set RX hardware timestamps in igc_build_skb()

Kohei Enju
2026-03-17T06:22:45Z

igc_construct_skb() sets RX hardware timestamps, but igc_build_skb()
does not. This has not been observable so far since igc currently does
not enable the build_skb RX path.

Set RX hardware timestamps in igc_build_skb() as well so that both skb
construction paths provide the same behavior.

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Kohei Enju <kohei@enjuk.jp>
---
drivers/net/ethernet/intel/igc/igc_main.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index cad5a26cc84d..79192b02e6be 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1964,8 +1964,9 @@ static void igc_add_rx_frag(struct igc_ring *rx_ring,

static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer,
- struct xdp_buff *xdp)
+ struct igc_xdp_buff *ctx)
{
+ struct xdp_buff *xdp = &ctx->xdp;
unsigned int size = xdp->data_end - xdp->data;
unsigned int truesize = igc_get_rx_frame_truesize(rx_ring, size);
unsigned int metasize = xdp->data - xdp->data_meta;
@@ -1979,6 +1980,11 @@ static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
if (unlikely(!skb))
return NULL;

+ if (ctx->rx_ts) {
+ skb_shinfo(skb)->tx_flags |= SKBTX_HW_TSTAMP_NETDEV;
+ skb_hwtstamps(skb)->netdev_data = ctx->rx_ts;
+ }
+
/* update pointers within the skb to store the data */
skb_reserve(skb, xdp->data - xdp->data_hard_start);
__skb_put(skb, size);
@@ -2681,7 +2687,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
} else if (skb)
igc_add_rx_frag(rx_ring, rx_buffer, skb, size);
else if (ring_uses_build_skb(rx_ring))
- skb = igc_build_skb(rx_ring, rx_buffer, &ctx.xdp);
+ skb = igc_build_skb(rx_ring, rx_buffer, &ctx);
else
skb = igc_construct_skb(rx_ring, rx_buffer, &ctx);

--
2.51.0