[PATCH net-next 2/9] eth: fbnic: Update Headroom
From: Mohsin Bashir <hidden>
Date: 2025-07-23 15:00:16
Subsystem:
meta ethernet drivers, networking drivers, the rest · Maintainers:
Alexander Duyck, Jakub Kicinski, Andrew Lunn, "David S. Miller", Eric Dumazet, Paolo Abeni, Linus Torvalds
Fbnic currently reserves a minimum of 64B headroom, but this is insufficient for inserting additional headers (e.g., IPV6) via XDP, as only 24 bytes are available for adjustment. To address this limitation, increase the headroom to a larger value while ensuring better page use. Although the resulting headroom (192B) is smaller than the recommended value (256B), forcing the headroom to 256B would require aligning to 256B (as opposed to the current 128B), which can push the max headroom to 511B. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Mohsin Bashir <redacted> --- drivers/net/ethernet/meta/fbnic/fbnic_txrx.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
index 4d248f94ec9b..398310be592e 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h@@ -50,8 +50,9 @@ struct fbnic_net; #define FBNIC_RX_TROOM \ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +#define FBNIC_RX_HROOM_PAD 128 #define FBNIC_RX_HROOM \ - (ALIGN(FBNIC_RX_TROOM + NET_SKB_PAD, 128) - FBNIC_RX_TROOM) + (ALIGN(FBNIC_RX_TROOM + FBNIC_RX_HROOM_PAD, 128) - FBNIC_RX_TROOM) #define FBNIC_RX_PAD 0 #define FBNIC_RX_PAYLD_OFFSET 0 #define FBNIC_RX_PAYLD_PG_CL 0
--
2.47.1