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>tirimbino
sjur.brandeland@stericsson.com
13 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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