eth: fbnic: set DMA_HINT_L4 for all flows

[ Upstream commit 0f30a31 ]

fbnic always advertises ETHTOOL_TCP_DATA_SPLIT_ENABLED via ethtool
.get_ringparam. To enable proper splitting for all flow types, even for
IP/Ethernet flows, this patch sets DMA_HINT_L4 unconditionally for all
RSS and NFC flow steering rules. According to the spec, L4 falls back to
L3 if no valid L4 is found, and L3 falls back to L2 if no L3 is found.
This makes sure that the correct header boundary is used regardless of
traffic type. This is important for zero-copy use cases where we must
ensure that all ZC packets are split correctly.

Fixes: 2b30fc0 ("eth: fbnic: Add support for HDS configuration")
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260211-fbnic-tcp-hds-fixes-v1-3-55d050e6f606@meta.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: beshleman

drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c

@@ -1142,6 +1142,9 @@ static int fbnic_set_cls_rule_ins(struct fbnic_net *fbn,
 		return -EINVAL;
 	}
 
+	dest |= FIELD_PREP(FBNIC_RPC_ACT_TBL0_DMA_HINT,
+			   FBNIC_RCD_HDR_AL_DMA_HINT_L4);
+
 	/* Write action table values */
 	act_tcam->dest = dest;
 	act_tcam->rss_en_mask = fbnic_flow_hash_2_rss_en_mask(fbn, hash_idx);

drivers/net/ethernet/meta/fbnic/fbnic_rpc.c

@@ -338,9 +338,8 @@ void fbnic_rss_reinit(struct fbnic_dev *fbd, struct fbnic_net *fbn)
 		else if (tstamp_mask & (1u << flow_type))
 			dest |= FBNIC_RPC_ACT_TBL0_TS_ENA;
 
-		if (act1_value[flow_type] & FBNIC_RPC_TCAM_ACT1_L4_VALID)
-			dest |= FIELD_PREP(FBNIC_RPC_ACT_TBL0_DMA_HINT,
-					   FBNIC_RCD_HDR_AL_DMA_HINT_L4);
+		dest |= FIELD_PREP(FBNIC_RPC_ACT_TBL0_DMA_HINT,
+				   FBNIC_RCD_HDR_AL_DMA_HINT_L4);
 
 		rss_en_mask = fbnic_flow_hash_2_rss_en_mask(fbn, flow_type);