From 0cf5a39720d09793f9cc5a8ec6bb026e6b20e883 Mon Sep 17 00:00:00 2001 From: Mohsin Bashir Date: Wed, 13 Aug 2025 15:13:12 -0700 Subject: [PATCH] eth: fbnic: Update Headroom 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 Signed-off-by: Mohsin Bashir Link: https://patch.msgid.link/20250813221319.3367670-3-mohsin.bashr@gmail.com Signed-off-by: Paolo Abeni --- 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 7d27712d54625..66c84375e2998 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 -- 2.51.0