NCM 1.0 does not support anything but Ethernet framing, hence CAIF payload will be put into Ethernet frames. Discovery is based on fixed USB vendor 0x04cc (ST-Ericsson), product-id 0x230f (NCM). In this variant only CAIF payload is sent over the NCM interface. The CAIF stack (cfusbl.c) will when USB interface register first check if we got a CDC NCM USB interface with the right VID, PID. It will then read the device's Ethernet address and create a 'template' Ethernet TX header, using a broadcast address as the destination address, and EthType 0x88b5 (802.1 Local Experimental - vendor specific). A protocol handler for 0x88b5 is setup for reception of CAIF frames from the CDC NCM USB interface. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>linux-3.10.1
sjur.brandeland@stericsson.com
12 years ago
committed by
David S. Miller
parent
63afe12f4b
commit
7ad65bf68d
@ -0,0 +1,208 @@
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/*
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* CAIF USB handler
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* Copyright (C) ST-Ericsson AB 2011
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* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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#include <net/netns/generic.h>
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#include <net/caif/caif_dev.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/cfcnfg.h>
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MODULE_LICENSE("GPL");
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#define CFUSB_PAD_DESCR_SZ 1 /* Alignment descriptor length */
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#define CFUSB_ALIGNMENT 4 /* Number of bytes to align. */
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#define CFUSB_MAX_HEADLEN (CFUSB_PAD_DESCR_SZ + CFUSB_ALIGNMENT-1)
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#define STE_USB_VID 0x04cc /* USB Product ID for ST-Ericsson */
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#define STE_USB_PID_CAIF 0x2306 /* Product id for CAIF Modems */
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struct cfusbl {
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struct cflayer layer;
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u8 tx_eth_hdr[ETH_HLEN];
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};
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static bool pack_added;
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static int cfusbl_receive(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 hpad;
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/* Remove padding. */
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cfpkt_extr_head(pkt, &hpad, 1);
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cfpkt_extr_head(pkt, NULL, hpad);
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return layr->up->receive(layr->up, pkt);
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}
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static int cfusbl_transmit(struct cflayer *layr, struct cfpkt *pkt)
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{
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struct caif_payload_info *info;
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u8 hpad;
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u8 zeros[CFUSB_ALIGNMENT];
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struct sk_buff *skb;
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struct cfusbl *usbl = container_of(layr, struct cfusbl, layer);
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skb = cfpkt_tonative(pkt);
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skb_reset_network_header(skb);
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skb->protocol = htons(ETH_P_IP);
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info = cfpkt_info(pkt);
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hpad = (info->hdr_len + CFUSB_PAD_DESCR_SZ) & (CFUSB_ALIGNMENT - 1);
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if (skb_headroom(skb) < ETH_HLEN + CFUSB_PAD_DESCR_SZ + hpad) {
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pr_warn("Headroom to small\n");
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kfree_skb(skb);
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return -EIO;
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}
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memset(zeros, 0, hpad);
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cfpkt_add_head(pkt, zeros, hpad);
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cfpkt_add_head(pkt, &hpad, 1);
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cfpkt_add_head(pkt, usbl->tx_eth_hdr, sizeof(usbl->tx_eth_hdr));
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return layr->dn->transmit(layr->dn, pkt);
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}
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static void cfusbl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
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int phyid)
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{
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if (layr->up && layr->up->ctrlcmd)
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layr->up->ctrlcmd(layr->up, ctrl, layr->id);
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}
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struct cflayer *cfusbl_create(int phyid, u8 ethaddr[ETH_ALEN],
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u8 braddr[ETH_ALEN])
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{
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struct cfusbl *this = kmalloc(sizeof(struct cfusbl), GFP_ATOMIC);
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if (!this) {
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pr_warn("Out of memory\n");
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return NULL;
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}
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caif_assert(offsetof(struct cfusbl, layer) == 0);
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memset(this, 0, sizeof(struct cflayer));
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this->layer.receive = cfusbl_receive;
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this->layer.transmit = cfusbl_transmit;
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this->layer.ctrlcmd = cfusbl_ctrlcmd;
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snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid);
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this->layer.id = phyid;
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/*
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* Construct TX ethernet header:
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* 0-5 destination address
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* 5-11 source address
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* 12-13 protocol type
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*/
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memcpy(&this->tx_eth_hdr[ETH_ALEN], braddr, ETH_ALEN);
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memcpy(&this->tx_eth_hdr[ETH_ALEN], ethaddr, ETH_ALEN);
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this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff;
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this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff;
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pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n",
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this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN,
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this->tx_eth_hdr[12], this->tx_eth_hdr[13]);
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return (struct cflayer *) this;
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}
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static struct packet_type caif_usb_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_802_EX1),
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};
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static int cfusbl_device_notify(struct notifier_block *me, unsigned long what,
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void *arg)
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{
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struct net_device *dev = arg;
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struct caif_dev_common common;
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struct cflayer *layer, *link_support;
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struct usbnet *usbnet = netdev_priv(dev);
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struct usb_device *usbdev = usbnet->udev;
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struct ethtool_drvinfo drvinfo;
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/*
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* Quirks: High-jack ethtool to find if we have a NCM device,
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* and find it's VID/PID.
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*/
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if (dev->ethtool_ops == NULL || dev->ethtool_ops->get_drvinfo == NULL)
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return 0;
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dev->ethtool_ops->get_drvinfo(dev, &drvinfo);
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if (strncmp(drvinfo.driver, "cdc_ncm", 7) != 0)
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return 0;
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pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n",
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le16_to_cpu(usbdev->descriptor.idVendor),
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le16_to_cpu(usbdev->descriptor.idProduct));
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/* Check for VID/PID that supports CAIF */
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if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID &&
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le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF))
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return 0;
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if (what == NETDEV_UNREGISTER)
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module_put(THIS_MODULE);
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if (what != NETDEV_REGISTER)
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return 0;
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__module_get(THIS_MODULE);
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memset(&common, 0, sizeof(common));
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common.use_frag = false;
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common.use_fcs = false;
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common.use_stx = false;
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common.link_select = CAIF_LINK_HIGH_BANDW;
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common.flowctrl = NULL;
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link_support = cfusbl_create(dev->ifindex, dev->dev_addr,
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dev->broadcast);
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if (!link_support)
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return -ENOMEM;
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if (dev->num_tx_queues > 1)
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pr_warn("USB device uses more than one tx queue\n");
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caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN,
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&layer, &caif_usb_type.func);
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if (!pack_added)
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dev_add_pack(&caif_usb_type);
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pack_added = 1;
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strncpy(layer->name, dev->name,
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sizeof(layer->name) - 1);
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layer->name[sizeof(layer->name) - 1] = 0;
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return 0;
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}
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static struct notifier_block caif_device_notifier = {
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.notifier_call = cfusbl_device_notify,
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.priority = 0,
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};
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static int __init cfusbl_init(void)
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{
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return register_netdevice_notifier(&caif_device_notifier);
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}
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static void __exit cfusbl_exit(void)
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{
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unregister_netdevice_notifier(&caif_device_notifier);
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dev_remove_pack(&caif_usb_type);
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}
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module_init(cfusbl_init);
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module_exit(cfusbl_exit);
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