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NCM buffer sizes are negotiated with the device independently of the network device MTU. The RX buffers are allocated by the usbnet framework based on the rx_urb_size value set by cdc_ncm. A single RX buffer can hold a number of MTU sized packets. The default usbnet change_mtu ndo only modifies rx_urb_size if it is equal to hard_mtu. And the cdc_ncm driver will set rx_urb_size and hard_mtu independently of each other, based on dwNtbInMaxSize and dwNtbOutMaxSize respectively. It was therefore assumed that usbnet_change_mtu() would never touch rx_urb_size. This failed to consider the case where dwNtbInMaxSize and dwNtbOutMaxSize happens to be equal. Fix by implementing an NCM specific change_mtu ndo, modifying the netdev MTU without touching the buffer size settings. Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
152 lines
5.3 KiB
C
152 lines
5.3 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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#ifndef __LINUX_USB_CDC_NCM_H
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#define __LINUX_USB_CDC_NCM_H
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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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/* Initial NTB length */
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#define CDC_NCM_NTB_DEF_SIZE_TX 16384 /* bytes */
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#define CDC_NCM_NTB_DEF_SIZE_RX 16384 /* 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_USEC 400UL
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#define CDC_NCM_TIMER_INTERVAL_MIN 5UL
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#define CDC_NCM_TIMER_INTERVAL_MAX (U32_MAX / NSEC_PER_USEC)
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/* Driver flags */
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#define CDC_NCM_FLAG_NDP_TO_END 0x02 /* NDP is placed at end of frame */
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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_mbim_extended_desc *mbim_extended_desc;
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const struct usb_cdc_ether_desc *ether_desc;
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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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int drvflags;
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u32 timer_interval;
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u32 max_ndp_size;
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struct usb_cdc_ncm_ndp16 *delayed_ndp16;
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u32 tx_timer_pending;
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u32 tx_curr_frame_num;
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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 min_tx_pkt;
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/* statistics */
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u32 tx_curr_frame_payload;
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u32 tx_reason_ntb_full;
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u32 tx_reason_ndp_full;
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u32 tx_reason_timeout;
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u32 tx_reason_max_datagram;
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u64 tx_overhead;
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u64 tx_ntbs;
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u64 rx_overhead;
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u64 rx_ntbs;
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};
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u8 cdc_ncm_select_altsetting(struct usb_interface *intf);
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int cdc_ncm_change_mtu(struct net_device *net, int new_mtu);
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int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags);
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void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
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struct sk_buff *cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign);
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int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
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int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
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struct sk_buff *
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cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags);
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int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in);
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#endif /* __LINUX_USB_CDC_NCM_H */
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