1 files changed, 46 insertions, 28 deletions

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index b3568c453b14..5f37ed3506d5 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -601,14 +601,24 @@ static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
-static void xgene_enet_skip_csum(struct sk_buff *skb)
+static void xgene_enet_rx_csum(struct sk_buff *skb)
 {
+	struct net_device *ndev = skb->dev;
 	struct iphdr *iph = ip_hdr(skb);
 
-	if (!ip_is_fragment(iph) ||
-	    (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) {
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-	}
+	if (!(ndev->features & NETIF_F_RXCSUM))
+		return;
+
+	if (skb->protocol != htons(ETH_P_IP))
+		return;
+
+	if (ip_is_fragment(iph))
+		return;
+
+	if (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)
+		return;
+
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
 }
 
 static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool,
@@ -648,12 +658,24 @@ static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool,
 	buf_pool->head = head;
 }
 
+/* Errata 10GE_8 and ENET_11 - allow packet with length <=64B */
+static bool xgene_enet_errata_10GE_8(struct sk_buff *skb, u32 len, u8 status)
+{
+	if (status == INGRESS_PKT_LEN && len == ETHER_MIN_PACKET) {
+		if (ntohs(eth_hdr(skb)->h_proto) < 46)
+			return true;
+	}
+
+	return false;
+}
+
 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 			       struct xgene_enet_raw_desc *raw_desc,
 			       struct xgene_enet_raw_desc *exp_desc)
 {
 	struct xgene_enet_desc_ring *buf_pool, *page_pool;
 	u32 datalen, frag_size, skb_index;
+	struct xgene_enet_pdata *pdata;
 	struct net_device *ndev;
 	dma_addr_t dma_addr;
 	struct sk_buff *skb;
@@ -666,6 +688,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 	bool nv;
 
 	ndev = rx_ring->ndev;
+	pdata = netdev_priv(ndev);
 	dev = ndev_to_dev(rx_ring->ndev);
 	buf_pool = rx_ring->buf_pool;
 	page_pool = rx_ring->page_pool;
@@ -676,30 +699,29 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 	skb = buf_pool->rx_skb[skb_index];
 	buf_pool->rx_skb[skb_index] = NULL;
 
+	datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
+	skb_put(skb, datalen);
+	prefetch(skb->data - NET_IP_ALIGN);
+	skb->protocol = eth_type_trans(skb, ndev);
+
 	/* checking for error */
-	status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) ||
+	status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) |
 		  GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
-	if (unlikely(status > 2)) {
-		dev_kfree_skb_any(skb);
-		xgene_enet_free_pagepool(page_pool, raw_desc, exp_desc);
-		xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
-				       status);
-		ret = -EIO;
-		goto out;
+	if (unlikely(status)) {
+		if (!xgene_enet_errata_10GE_8(skb, datalen, status)) {
+			dev_kfree_skb_any(skb);
+			xgene_enet_free_pagepool(page_pool, raw_desc, exp_desc);
+			xgene_enet_parse_error(rx_ring, pdata, status);
+			goto out;
+		}
 	}
 
-	/* strip off CRC as HW isn't doing this */
-	datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
-
 	nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
-	if (!nv)
+	if (!nv) {
+		/* strip off CRC as HW isn't doing this */
 		datalen -= 4;
-
-	skb_put(skb, datalen);
-	prefetch(skb->data - NET_IP_ALIGN);
-
-	if (!nv)
 		goto skip_jumbo;
+	}
 
 	slots = page_pool->slots - 1;
 	head = page_pool->head;
@@ -728,11 +750,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 
 skip_jumbo:
 	skb_checksum_none_assert(skb);
-	skb->protocol = eth_type_trans(skb, ndev);
-	if (likely((ndev->features & NETIF_F_IP_CSUM) &&
-		   skb->protocol == htons(ETH_P_IP))) {
-		xgene_enet_skip_csum(skb);
-	}
+	xgene_enet_rx_csum(skb);
 
 	rx_ring->rx_packets++;
 	rx_ring->rx_bytes += datalen;
@@ -2039,7 +2057,7 @@ static int xgene_enet_probe(struct platform_device *pdev)
 	xgene_enet_setup_ops(pdata);
 
 	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
-		ndev->features |= NETIF_F_TSO;
+		ndev->features |= NETIF_F_TSO | NETIF_F_RXCSUM;
 		spin_lock_init(&pdata->mss_lock);
 	}
 	ndev->hw_features = ndev->features;