589 lines
14 KiB
C
Executable File
589 lines
14 KiB
C
Executable File
/*
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* Copyright (C) 2020 Spreadtrum Communications Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "sipa_dummy: " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/device.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/kthread.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/of_device.h>
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#include <linux/interrupt.h>
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#include <linux/netdev_features.h>
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#include <linux/mutex.h>
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#include <net/arp.h>
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#include "sipa_eth.h"
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#include "sipa_core.h"
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#include "../include/sipa.h"
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/* Device status */
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#define DEV_ON 1
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#define DEV_OFF 0
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#define SIPA_DUMMY_NAPI_WEIGHT 64
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extern struct sipa_eth_netid_device * dev_list[];
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static struct net_device *dummy_dev;
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static struct dentry *dummy_root;
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static int sipa_dummy_debugfs_mknod(void *data);
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#ifndef CONFIG_SPRD_ETHERNET
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static int sipa_arp_reply(struct net_device *net, struct sk_buff *skb) {
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struct arphdr *parp;
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u8 *arpptr, *sha;
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u8 sip[4], tip[4];
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struct sk_buff *reply = NULL;
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parp = arp_hdr(skb);
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if (parp->ar_hrd == htons(ARPHRD_ETHER) && parp->ar_pro == htons(ETH_P_IP)
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&& parp->ar_op == htons(ARPOP_REQUEST) && parp->ar_hln == 6 && parp->ar_pln == 4) {
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arpptr = (u8 *)parp + sizeof(struct arphdr);
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sha = arpptr;
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arpptr += net->addr_len; /* sha */
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memcpy(sip, arpptr, sizeof(sip));
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arpptr += sizeof(sip);
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arpptr += net->addr_len; /* tha */
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memcpy(tip, arpptr, sizeof(tip));
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pr_info("%s sip = %d.%d.%d.%d, tip=%d.%d.%d.%d\n", netdev_name(net), sip[0], sip[1], sip[2], sip[3], tip[0], tip[1], tip[2], tip[3]);
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reply = arp_create(ARPOP_REPLY, ETH_P_ARP, *((__be32 *)sip), skb->dev, *((__be32 *)tip), sha, net->dev_addr, sha);
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if (reply) {
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dev_queue_xmit(reply);
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}
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return 1;
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}
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return 0;
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}
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static void sipa_get_modem_mac(struct sk_buff *skb, struct SIPA_ETH *sipa_eth)
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{
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struct ethhdr *ehdr;
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struct iphdr *iph;
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struct udphdr *udph;
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struct sipa_eth_init_data *pdata = sipa_eth->pdata;
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ehdr = (struct ethhdr *)(skb->data - ETH_HLEN);
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iph = ip_hdr(skb);
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udph = (struct udphdr *)(skb->data + iph->ihl*4);
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if (ehdr->h_proto == htons(ETH_P_ARP)) {
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sipa_arp_reply(skb->dev, skb);
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return;
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}
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//printk("%s skb=%p, h_proto=%x, protocol=%x, saddr=%x, daddr=%x dest=%x\n", __func__, skb, ehdr->h_proto, iph->protocol, iph->saddr, iph->daddr, udph->dest);
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if (ehdr->h_proto == htons(ETH_P_IP) && iph->protocol == IPPROTO_UDP && iph->saddr != 0x00000000 && iph->daddr == 0xFFFFFFFF) {
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if (udph->dest == htons(68)) //DHCP offer/ACK
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{
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memcpy(pdata->modem_mac, ehdr->h_source, ETH_ALEN);
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pr_info("Modem Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
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pdata->modem_mac[0], pdata->modem_mac[1], pdata->modem_mac[2], pdata->modem_mac[3], pdata->modem_mac[4], pdata->modem_mac[5]);
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}
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}
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}
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#endif
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/* Term type 0x6 means we are in direct mode, currently.
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* we will recv pkt with a dummy mac header, which will
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* cause us fail to get skb->pkt_type and skb->protocol.
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*/
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static void sipa_dummy_prepare_skb(struct sk_buff *skb)
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{
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struct iphdr *iph;
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struct ipv6hdr *ipv6h;
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struct net_device *dev;
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unsigned int real_len = 0, payload_len = 0;
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bool ip_arp = true;
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dev = skb->dev;
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skb->protocol = eth_type_trans(skb, dev);
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skb_reset_network_header(skb);
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switch (ntohs(skb->protocol)) {
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case ETH_P_IP:
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iph = ip_hdr(skb);
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real_len = ntohs(iph->tot_len);
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break;
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case ETH_P_IPV6:
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ipv6h = ipv6_hdr(skb);
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payload_len = ntohs(ipv6h->payload_len);
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real_len = payload_len + sizeof(struct ipv6hdr);
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break;
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case ETH_P_ARP:
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real_len = arp_hdr_len(dev);
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break;
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default:
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ip_arp = false;
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break;
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}
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if (ip_arp)
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skb_trim(skb, real_len);
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/* TODO chechsum ... */
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skb->ip_summed = CHECKSUM_NONE;
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skb->pkt_type = PACKET_HOST;
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}
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/* Term type 0x6 means we are in direct mode, currently.
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* we will recv pkt with a dummy mac header, which will
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* cause us fail to get skb->pkt_type and skb->protocol.
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*/
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static void sipa_dummy_direct_mode_prepare_skb(struct sk_buff *skb)
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{
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struct iphdr *iph;
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struct ipv6hdr *ipv6h;
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unsigned int real_len = 0, payload_len = 0;
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skb_pull_inline(skb, ETH_HLEN);
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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if (iph->version == 4) {
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skb->protocol = htons(ETH_P_IP);
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iph = ip_hdr(skb);
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real_len = ntohs(iph->tot_len);
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skb_trim(skb, real_len);
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} else if(iph->version == 6){
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skb->protocol = htons(ETH_P_IPV6);
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ipv6h = ipv6_hdr(skb);
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payload_len = ntohs(ipv6h->payload_len);
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real_len = payload_len + sizeof(struct ipv6hdr);
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skb_trim(skb, real_len);
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} else {
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pr_err("unrecognized ip version %d\n", iph->version);
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}
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skb->ip_summed = CHECKSUM_NONE;
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skb->pkt_type = PACKET_HOST;
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}
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static int sipa_dummy_rx(struct SIPA_DUMMY *sipa_dummy, int budget)
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{
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struct sk_buff *skb;
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struct sipa_eth_netid_device *netid_dev_info;
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struct SIPA_ETH *sipa_eth;
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int real_netid = 0;
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int skb_cnt = 0;
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int ret;
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if (!sipa_dummy) {
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pr_err("no sipa_dummy device\n");
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return -EINVAL;
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}
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atomic_set(&sipa_dummy->rx_evt, 0);
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while (skb_cnt < budget) {
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ret = sipa_nic_rx(&real_netid, &skb, skb_cnt);
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if (ret) {
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switch (ret) {
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case -ENODEV:
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pr_err("sipa fail to find dev\n");
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sipa_dummy->stats.rx_errors++;
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sipa_dummy->netdev->stats.rx_errors++;
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break;
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case -ENODATA:
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pr_err("sipa no data\n");
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atomic_set(&sipa_dummy->rx_busy, 0);
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break;
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}
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break;
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}
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skb_cnt++;
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sipa_dummy->stats.rx_packets++;
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sipa_dummy->stats.rx_bytes += skb->len;
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if (real_netid < 0) {
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pr_err("sipa invaild netid");
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break;
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}
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/*
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* We should determine the real device before we do eth_types_tran,
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*/
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if (real_netid < 0 || real_netid >= SIPA_DUMMY_IFACE_NUM) {
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pr_err("illegal real_netid %d\n", real_netid);
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dev_kfree_skb_any(skb);
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break;
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}
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netid_dev_info = dev_list[real_netid];
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if (!netid_dev_info || netid_dev_info->state == DEV_OFF) {
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pr_info("netid= %d net is not DEV_ON\n", real_netid);
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dev_kfree_skb_any(skb);
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break;
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}
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skb->dev = netid_dev_info->ndev;
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sipa_eth = netdev_priv(skb->dev);
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sipa_eth->stats.rx_packets++;
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sipa_eth->stats.rx_bytes += skb->len;
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if (sipa_eth->pdata->term_type == 0x6) {
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sipa_dummy_direct_mode_prepare_skb(skb);
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} else {
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sipa_dummy_prepare_skb(skb);
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#ifndef CONFIG_SPRD_ETHERNET
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sipa_get_modem_mac(skb, sipa_eth);
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#endif
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}
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#ifdef CONFIG_QCA_NSS_DRV
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netif_receive_skb(skb);
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#else
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napi_gro_receive(&sipa_dummy->napi, skb);
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#endif
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}
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return skb_cnt;
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}
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static int sipa_dummy_rx_poll_handler(struct napi_struct *napi, int budget)
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{
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int pkts = 0, num, tmp = 0;
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struct SIPA_DUMMY *sipa_dummy = container_of(napi, struct SIPA_DUMMY, napi);
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READ_AGAIN:
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num = sipa_nic_get_filled_num();
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if (!num)
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goto check;
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if (num > budget)
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num = budget;
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pkts = sipa_dummy_rx(sipa_dummy, num);
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if (pkts > 0)
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sipa_nic_set_tx_fifo_rp(pkts);
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tmp += pkts;
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budget -= pkts;
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if (!budget)
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goto out;
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check:
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if (!sipa_check_recv_tx_fifo_empty() ||
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atomic_read(&sipa_dummy->rx_evt)) {
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atomic_set(&sipa_dummy->rx_evt, 0);
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goto READ_AGAIN;
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}
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atomic_set(&sipa_dummy->rx_busy, 0);
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napi_complete(napi);
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sipa_nic_restore_irq();
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if (atomic_read(&sipa_dummy->rx_evt) ||
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atomic_read(&sipa_dummy->rx_busy) ||
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!sipa_check_recv_tx_fifo_empty()) {
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atomic_set(&sipa_dummy->rx_evt, 0);
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napi_schedule(&sipa_dummy->napi);
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}
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out:
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return tmp;
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}
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static void sipa_dummy_rx_handler (void *priv)
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{
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struct SIPA_DUMMY *sipa_dummy = (struct SIPA_DUMMY *)priv;
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if (!sipa_dummy) {
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pr_err("data is NULL\n");
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return;
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}
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if (!atomic_cmpxchg(&sipa_dummy->rx_busy, 0, 1)) {
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atomic_set(&sipa_dummy->rx_evt, 0);
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napi_schedule(&sipa_dummy->napi);
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}
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}
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/* for sipa to invoke */
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void sipa_dummy_recv_trigger(void)
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{
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struct SIPA_DUMMY *sipa_dummy;
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if (!dummy_dev)
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return;
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sipa_dummy = netdev_priv(dummy_dev);
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atomic_set(&sipa_dummy->rx_evt, 1);
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sipa_dummy_rx_handler(sipa_dummy);
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}
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static int sipa_dummy_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct SIPA_DUMMY *sipa_dummy = netdev_priv(dev);
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/* update netdev statistics */
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sipa_dummy->stats.tx_packets++;
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sipa_dummy->stats.tx_bytes += skb->len;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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/* Open interface */
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static int sipa_dummy_open(struct net_device *dev)
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{
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struct SIPA_DUMMY *sipa_dummy = netdev_priv(dev);
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struct sipa_core *ctrl = sipa_get_ctrl_pointer();
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if (!ctrl) {
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return -EINVAL;
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}
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if(!ctrl->remote_ready)
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return -EINVAL;
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pr_info("dummy open\n");
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if (!netif_carrier_ok(sipa_dummy->netdev)) {
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netif_carrier_on(sipa_dummy->netdev);
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}
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netif_start_queue(dev);
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//napi_enable(&sipa_dummy->napi);
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napi_schedule(&sipa_dummy->napi);
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return 0;
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}
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/* Close interface */
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static int sipa_dummy_close(struct net_device *dev)
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{
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//struct SIPA_DUMMY *sipa_dummy = netdev_priv(dev);
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pr_info("close dummy!\n");
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//napi_disable(&sipa_dummy->napi);
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netif_stop_queue(dev);
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netif_carrier_off(dev);
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return 0;
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}
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static struct net_device_stats *sipa_dummy_get_stats(struct net_device *dev)
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{
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struct SIPA_DUMMY *sipa_dummy = netdev_priv(dev);
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return &sipa_dummy->stats;
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}
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static const struct net_device_ops sipa_dummy_ops = {
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.ndo_open = sipa_dummy_open,
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.ndo_stop = sipa_dummy_close,
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.ndo_start_xmit = sipa_dummy_start_xmit,
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.ndo_get_stats = sipa_dummy_get_stats,
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};
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static void s_setup(struct net_device *dev)
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{
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ether_setup(dev);
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}
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static int sipa_dummy_probe(struct platform_device *pdev)
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{
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struct SIPA_DUMMY *sipa_dummy;
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struct net_device *netdev;
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int ret;
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#ifdef NET_NAME_PREDICTABLE
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netdev = alloc_netdev(
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sizeof(struct SIPA_DUMMY),
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"sipa_dummy0",
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NET_NAME_PREDICTABLE,
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s_setup);
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#else
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netdev = alloc_netdev(
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sizeof(struct SIPA_DUMMY),
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"sipa_dummy0",
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s_setup);
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#endif
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if (!netdev) {
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pr_err("alloc_netdev() failed.\n");
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return -ENOMEM;
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}
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dummy_dev = netdev;
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netdev->type = ARPHRD_ETHER;
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sipa_dummy = netdev_priv(netdev);
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sipa_dummy->netdev = netdev;
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netdev->netdev_ops = &sipa_dummy_ops;
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netdev->watchdog_timeo = 1 * HZ;
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netdev->irq = 0;
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netdev->dma = 0;
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netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM);
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//random_ether_addr(netdev->dev_addr);
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eth_hw_addr_random(netdev);
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netif_napi_add(netdev,
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&sipa_dummy->napi,
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sipa_dummy_rx_poll_handler,
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SIPA_DUMMY_NAPI_WEIGHT);
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/* Register new Ethernet interface */
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ret = register_netdev(netdev);
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if (ret) {
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pr_err("register_netdev() failed (%d)\n", ret);
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netif_napi_del(&sipa_dummy->napi);
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free_netdev(netdev);
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return ret;
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}
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/* Set link as disconnected */
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netif_carrier_off(netdev);
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platform_set_drvdata(pdev, sipa_dummy);
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sipa_dummy_debugfs_mknod((void *)sipa_dummy);
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napi_enable(&sipa_dummy->napi);
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return 0;
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}
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/* Cleanup Ethernet device driver. */
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static int sipa_dummy_remove(struct platform_device *pdev)
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{
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struct SIPA_DUMMY *sipa_dummy= platform_get_drvdata(pdev);
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netif_stop_queue(sipa_dummy->netdev);
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napi_disable(&sipa_dummy->napi);
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netif_napi_del(&sipa_dummy->napi);
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unregister_netdev(sipa_dummy->netdev);
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free_netdev(sipa_dummy->netdev);
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platform_set_drvdata(pdev, NULL);
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if (!IS_ERR_OR_NULL(dummy_root))
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debugfs_remove_recursive(dummy_root);
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return 0;
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}
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#ifdef SPRD_PCIE_USE_DTS
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static const struct of_device_id sipa_dummy_match_table[] = {
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{ .compatible = "sprd,sipa_dummy"},
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{ }
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};
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#endif
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static struct platform_driver sipa_dummy_driver = {
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.probe = sipa_dummy_probe,
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.remove = sipa_dummy_remove,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "sipa_dummy",
|
|
#ifdef SPRD_PCIE_USE_DTS
|
|
.of_match_table = sipa_dummy_match_table
|
|
#endif
|
|
}
|
|
};
|
|
|
|
#ifndef SPRD_PCIE_USE_DTS
|
|
static struct platform_device *sipa_dummy_device;
|
|
|
|
static int sipa_dummy_platform_device_reigster(void)
|
|
{
|
|
int retval = -ENOMEM;
|
|
|
|
sipa_dummy_device = platform_device_alloc("sipa_dummy", -1);
|
|
if (!sipa_dummy_device)
|
|
return retval;
|
|
|
|
retval = platform_device_add(sipa_dummy_device);
|
|
if (retval < 0)
|
|
platform_device_put(sipa_dummy_device);
|
|
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
|
|
static int sipa_dummy_debug_show(struct seq_file *m, void *v)
|
|
{
|
|
struct SIPA_DUMMY *sipa_dummy = (struct SIPA_DUMMY *)(m->private);
|
|
|
|
if (!sipa_dummy) {
|
|
pr_err("invalid data, sipa_dummy is NULL\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
seq_puts(m, "*************************************************\n");
|
|
seq_printf(m, "DEVICE: %s rx_busy=%d rx_evt=%d\n",
|
|
sipa_dummy->netdev->name, atomic_read(&sipa_dummy->rx_busy),
|
|
atomic_read(&sipa_dummy->rx_evt));
|
|
seq_puts(m, "*************************************************\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sipa_dummy_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sipa_dummy_debug_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations sipa_dummy_debug_fops = {
|
|
.open = sipa_dummy_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int sipa_dummy_debugfs_mknod(void *data)
|
|
{
|
|
if (!dummy_root) {
|
|
pr_err("dummy dir is NULL\n");
|
|
return -ENXIO;
|
|
}
|
|
debugfs_create_file("stats",
|
|
0444,
|
|
dummy_root,
|
|
data,
|
|
&sipa_dummy_debug_fops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init sipa_dummy_debugfs_init(void)
|
|
{
|
|
dummy_root = debugfs_create_dir("sipa_dummy", NULL);
|
|
if (!dummy_root)
|
|
pr_err("failed to create sipa_dummy debugfs dir\n");
|
|
}
|
|
|
|
int sipa_dummy_init(void)
|
|
{
|
|
sipa_dummy_debugfs_init();
|
|
#ifndef SPRD_PCIE_USE_DTS
|
|
sipa_dummy_platform_device_reigster();
|
|
#endif
|
|
return platform_driver_register(&sipa_dummy_driver);
|
|
}
|
|
EXPORT_SYMBOL(sipa_dummy_init);
|
|
|
|
void sipa_dummy_exit(void)
|
|
{
|
|
platform_driver_unregister(&sipa_dummy_driver);
|
|
#ifndef SPRD_PCIE_USE_DTS
|
|
platform_device_unregister(sipa_dummy_device);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(sipa_dummy_exit);
|