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1e8bbe6cd0
commit bd329e1 ("net: cdc_ncm: do not bind to NCM compatible MBIM devices")
introduced a new policy, preferring MBIM for dual NCM/MBIM functions if
the cdc_mbim driver was enabled. This caused a regression for users
wanting to use NCM.
Devices implementing NCM backwards compatibility according to section
3.2 of the MBIM v1.0 specification allow either NCM or MBIM on a single
USB function, using different altsettings. The cdc_ncm and cdc_mbim
drivers will both probe such functions, and must agree on a common
policy for selecting either MBIM or NCM. Until now, this policy has
been set at build time based on CONFIG_USB_NET_CDC_MBIM.
Use a module parameter to set the system policy at runtime, allowing the
user to prefer NCM on systems with the cdc_mbim driver.
Cc: Greg Suarez <gsuarez@smithmicro.com>
Cc: Alexey Orishko <alexey.orishko@stericsson.com>
Reported-by: Geir Haatveit <nospam@haatveit.nu>
Reported-by: Tommi Kyntola <kynde@ts.ray.fi>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=54791
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
136 lines
5.0 KiB
C
136 lines
5.0 KiB
C
/*
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* Copyright (C) ST-Ericsson 2010-2012
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* Contact: Alexey Orishko <alexey.orishko@stericsson.com>
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* Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
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*
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* USB Host Driver for Network Control Model (NCM)
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* http://www.usb.org/developers/devclass_docs/NCM10.zip
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*
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* The NCM encoding, decoding and initialization logic
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* derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose this file to be licensed under the terms
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* of the GNU General Public License (GPL) Version 2 or the 2-clause
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* BSD license listed below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define CDC_NCM_COMM_ALTSETTING_NCM 0
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#define CDC_NCM_COMM_ALTSETTING_MBIM 1
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#define CDC_NCM_DATA_ALTSETTING_NCM 1
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#define CDC_NCM_DATA_ALTSETTING_MBIM 2
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/* CDC NCM subclass 3.2.1 */
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#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
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/* Maximum NTB length */
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#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
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#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */
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/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
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#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
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/* Minimum value for MaxDatagramSize, ch. 8.1.3 */
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#define CDC_MBIM_MIN_DATAGRAM_SIZE 2048 /* bytes */
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#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
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/* Default value for MaxDatagramSize */
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#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */
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/*
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* Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
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* the last NULL entry.
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*/
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#define CDC_NCM_DPT_DATAGRAMS_MAX 40
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/* Restart the timer, if amount of datagrams is less than given value */
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#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
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#define CDC_NCM_TIMER_PENDING_CNT 2
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#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
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/* The following macro defines the minimum header space */
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#define CDC_NCM_MIN_HDR_SIZE \
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(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
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(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
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#define CDC_NCM_NDP_SIZE \
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(sizeof(struct usb_cdc_ncm_ndp16) + \
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(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
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#define cdc_ncm_comm_intf_is_mbim(x) ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
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(x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
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#define cdc_ncm_data_intf_is_mbim(x) ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)
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struct cdc_ncm_ctx {
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struct usb_cdc_ncm_ntb_parameters ncm_parm;
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struct hrtimer tx_timer;
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struct tasklet_struct bh;
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const struct usb_cdc_ncm_desc *func_desc;
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const struct usb_cdc_mbim_desc *mbim_desc;
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const struct usb_cdc_header_desc *header_desc;
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const struct usb_cdc_union_desc *union_desc;
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const struct usb_cdc_ether_desc *ether_desc;
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struct net_device *netdev;
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struct usb_device *udev;
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struct usb_host_endpoint *in_ep;
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struct usb_host_endpoint *out_ep;
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struct usb_host_endpoint *status_ep;
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struct usb_interface *intf;
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struct usb_interface *control;
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struct usb_interface *data;
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struct sk_buff *tx_curr_skb;
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struct sk_buff *tx_rem_skb;
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__le32 tx_rem_sign;
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spinlock_t mtx;
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atomic_t stop;
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u32 tx_timer_pending;
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u32 tx_curr_frame_num;
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u32 rx_speed;
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u32 tx_speed;
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u32 rx_max;
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u32 tx_max;
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u32 max_datagram_size;
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u16 tx_max_datagrams;
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u16 tx_remainder;
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u16 tx_modulus;
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u16 tx_ndp_modulus;
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u16 tx_seq;
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u16 rx_seq;
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u16 connected;
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};
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extern u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf);
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extern int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting);
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extern void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
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extern struct sk_buff *cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign);
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extern int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
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extern int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
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