cregit-Linux how code gets into the kernel

Release 4.14 net/dsa/tag_qca.c

Directory: net/dsa
/*
 * 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) return NULL; 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->dp->index); *phdr = htons(hdr); return skb; }

Contributors

PersonTokensPropCommitsCommitProp
John Crispin12895.52%133.33%
Vivien Didelot64.48%266.67%
Total134100.00%3100.00%


static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) { struct dsa_switch_tree *dst = dev->dsa_ptr; struct dsa_port *cpu_dp = dsa_get_cpu_port(dst); struct dsa_switch *ds; u8 ver; int port; __be16 *phdr, hdr; if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN))) return NULL; /* 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)) return NULL; /* 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 = cpu_dp->ds; if (!ds) return NULL; /* Get source port information */ port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK); if (!ds->ports[port].netdev) return NULL; /* Update skb & forward the frame accordingly */ skb->dev = ds->ports[port].netdev; return skb; }

Contributors

PersonTokensPropCommitsCommitProp
John Crispin17785.92%120.00%
Vivien Didelot157.28%240.00%
Florian Fainelli146.80%240.00%
Total206100.00%5100.00%

const struct dsa_device_ops qca_netdev_ops = { .xmit = qca_tag_xmit, .rcv = qca_tag_rcv, };

Overall Contributors

PersonTokensPropCommitsCommitProp
John Crispin40191.97%114.29%
Vivien Didelot214.82%457.14%
Florian Fainelli143.21%228.57%
Total436100.00%7100.00%
Directory: net/dsa
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.