/* * Copyright (c) 2015, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/etherdevice.h> #include "dsa_priv.h" #define QCA_HDR_LEN 2 #define QCA_HDR_VERSION 0x2 #define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14) #define QCA_HDR_RECV_VERSION_S 14 #define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11) #define QCA_HDR_RECV_PRIORITY_S 11 #define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6) #define QCA_HDR_RECV_TYPE_S 6 #define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3) #define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0) #define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14) #define QCA_HDR_XMIT_VERSION_S 14 #define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11) #define QCA_HDR_XMIT_PRIORITY_S 11 #define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8) #define QCA_HDR_XMIT_CONTROL_S 8 #define QCA_HDR_XMIT_FROM_CPU BIT(7) #define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0) static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev) { struct dsa_slave_priv *p = netdev_priv(dev); u16 *phdr, hdr; dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; if (skb_cow_head(skb, 0) < 0) goto out_free; skb_push(skb, QCA_HDR_LEN); memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN); phdr = (u16 *)(skb->data + 2 * ETH_ALEN); /* Set the version field, and set destination port information */ hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S | QCA_HDR_XMIT_FROM_CPU | BIT(p->port); *phdr = htons(hdr); return skb; out_free: kfree_skb(skb); return NULL; } static int qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { struct dsa_switch_tree *dst = dev->dsa_ptr; struct dsa_switch *ds; u8 ver; int port; __be16 *phdr, hdr; if (unlikely(!dst)) goto out_drop; skb = skb_unshare(skb, GFP_ATOMIC); if (!skb) goto out; if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN))) goto out_drop; /* The QCA header is added by the switch between src addr and Ethertype * At this point, skb->data points to ethertype so header should be * right before */ phdr = (__be16 *)(skb->data - 2); hdr = ntohs(*phdr); /* Make sure the version is correct */ ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S; if (unlikely(ver != QCA_HDR_VERSION)) goto out_drop; /* Remove QCA tag and recalculate checksum */ skb_pull_rcsum(skb, QCA_HDR_LEN); memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN, ETH_HLEN - QCA_HDR_LEN); /* This protocol doesn't support cascading multiple switches so it's * safe to assume the switch is first in the tree */ ds = dst->ds[0]; if (!ds) goto out_drop; /* Get source port information */ port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK); if (!ds->ports[port].netdev) goto out_drop; /* Update skb & forward the frame accordingly */ skb_push(skb, ETH_HLEN); skb->pkt_type = PACKET_HOST; skb->dev = ds->ports[port].netdev; skb->protocol = eth_type_trans(skb, skb->dev); skb->dev->stats.rx_packets++; skb->dev->stats.rx_bytes += skb->len; netif_receive_skb(skb); return 0; out_drop: kfree_skb(skb); out: return 0; } const struct dsa_device_ops qca_netdev_ops = { .xmit = qca_tag_xmit, .rcv = qca_tag_rcv, };