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The CDC-NCM driver can require large amounts of memory to create skb's and this can be a problem when the memory becomes fragmented. This especially affects embedded systems that have constrained resources but wish to maximise the throughput of CDC-NCM with 16KiB NTB's. The issue is after running for a while the kernel memory can become fragmented and it needs compacting. If the NTB allocation is needed before the memory has been compacted the atomic allocation can fail which can cause increased latency, large re-transmissions or disconnections depending upon the data being transmitted at the time. This situation occurs for less than a second until the kernel has compacted the memory but the failed devices can take a lot longer to recover from the failed TX packets. To ease this temporary situation I modified the CDC-NCM TX path to temporarily switch into a reduced memory mode which allocates an NTB that will fit into a USB_CDC_NCM_NTB_MIN_OUT_SIZE (default 2048 Bytes) sized memory block and only transmit NTB's with a single network frame until the memory situation is resolved. Each time this issue occurs we wait for an increasing number of reduced size allocations before requesting a full size one to not put additional pressure on a low memory system. Once the memory is compacted the CDC-NCM data can resume transmitting at the normal tx_max rate once again. Signed-off-by: Jim Baxter <jim_baxter@mentor.com> Reviewed-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
156 lines
5.4 KiB
C
156 lines
5.4 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_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE 0x04 /* Avoid altsetting toggle during init */
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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 tx_curr_size;
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u32 tx_low_mem_max_cnt;
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u32 tx_low_mem_val;
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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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