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net/can/bcm.c
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/* * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content * * Copyright (c) 2002-2007 Volkswagen Group Electronic Research * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Volkswagen nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * Alternatively, provided that this notice is retained in full, this * software may be distributed under the terms of the GNU General * Public License ("GPL") version 2, in which case the provisions of the * GPL apply INSTEAD OF those given above. * * The provided data structures and external interfaces from this code * are not restricted to be used by modules with a GPL compatible license. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * |
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*/ #include <linux/module.h> #include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/hrtimer.h> |
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#include <linux/list.h> #include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/uio.h> #include <linux/net.h> #include <linux/netdevice.h> #include <linux/socket.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <linux/can.h> #include <linux/can/core.h> #include <linux/can/bcm.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> #include <net/net_namespace.h> |
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/* * To send multiple CAN frame content within TX_SETUP or to filter * CAN messages with multiplex index within RX_SETUP, the number of * different filters is limited to 256 due to the one byte index value. */ #define MAX_NFRAMES 256 |
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/* use of last_frames[index].can_dlc */ #define RX_RECV 0x40 /* received data for this element */ #define RX_THR 0x80 /* element not been sent due to throttle feature */ #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ /* get best masking value for can_rx_register() for a given single can_id */ |
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#define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) |
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#define CAN_BCM_VERSION CAN_VERSION |
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static __initdata const char banner[] = KERN_INFO |
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"can: broadcast manager protocol (rev " CAN_BCM_VERSION " t) "; |
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MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); |
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MODULE_ALIAS("can-proto-2"); |
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/* easy access to can_frame payload */ static inline u64 GET_U64(const struct can_frame *cp) { return *(u64 *)cp->data; } struct bcm_op { struct list_head list; int ifindex; canid_t can_id; |
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u32 flags; |
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unsigned long frames_abs, frames_filtered; |
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struct timeval ival1, ival2; |
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struct hrtimer timer, thrtimer; |
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struct tasklet_struct tsklet, thrtsklet; |
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ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
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int rx_ifindex; |
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u32 count; u32 nframes; u32 currframe; |
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struct can_frame *frames; struct can_frame *last_frames; struct can_frame sframe; struct can_frame last_sframe; struct sock *sk; struct net_device *rx_reg_dev; }; static struct proc_dir_entry *proc_dir; struct bcm_sock { struct sock sk; int bound; int ifindex; struct notifier_block notifier; struct list_head rx_ops; struct list_head tx_ops; unsigned long dropped_usr_msgs; struct proc_dir_entry *bcm_proc_read; |
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char procname [32]; /* inode number in decimal with \0 */ |
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}; static inline struct bcm_sock *bcm_sk(const struct sock *sk) { return (struct bcm_sock *)sk; } #define CFSIZ sizeof(struct can_frame) #define OPSIZ sizeof(struct bcm_op) #define MHSIZ sizeof(struct bcm_msg_head) /* |
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* procfs functions */ |
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static char *bcm_proc_getifname(char *result, int ifindex) |
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{ struct net_device *dev; if (!ifindex) return "any"; |
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rcu_read_lock(); dev = dev_get_by_index_rcu(&init_net, ifindex); |
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if (dev) |
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strcpy(result, dev->name); else strcpy(result, "???"); |
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rcu_read_unlock(); |
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|
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return result; |
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} |
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static int bcm_proc_show(struct seq_file *m, void *v) |
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{ |
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char ifname[IFNAMSIZ]; |
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struct sock *sk = (struct sock *)m->private; |
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struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; |
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seq_printf(m, ">>> socket %pK", sk->sk_socket); seq_printf(m, " / sk %pK", sk); seq_printf(m, " / bo %pK", bo); |
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seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
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seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
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seq_printf(m, " <<< "); |
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list_for_each_entry(op, &bo->rx_ops, list) { unsigned long reduction; /* print only active entries & prevent division by zero */ if (!op->frames_abs) continue; |
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seq_printf(m, "rx_op: %03X %-5s ", |
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op->can_id, bcm_proc_getifname(ifname, op->ifindex)); |
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seq_printf(m, "[%u]%c ", op->nframes, |
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(op->flags & RX_CHECK_DLC)?'d':' '); |
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if (op->kt_ival1.tv64) |
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seq_printf(m, "timeo=%lld ", |
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(long long) ktime_to_us(op->kt_ival1)); |
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|
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if (op->kt_ival2.tv64) |
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seq_printf(m, "thr=%lld ", |
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(long long) ktime_to_us(op->kt_ival2)); |
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|
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seq_printf(m, "# recv %ld (%ld) => reduction: ", |
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op->frames_filtered, op->frames_abs); reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; |
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seq_printf(m, "%s%ld%% ", |
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(reduction == 100)?"near ":"", reduction); |
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} list_for_each_entry(op, &bo->tx_ops, list) { |
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seq_printf(m, "tx_op: %03X %s [%u] ", |
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op->can_id, bcm_proc_getifname(ifname, op->ifindex), |
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op->nframes); |
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|
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if (op->kt_ival1.tv64) |
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seq_printf(m, "t1=%lld ", |
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(long long) ktime_to_us(op->kt_ival1)); if (op->kt_ival2.tv64) |
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seq_printf(m, "t2=%lld ", |
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(long long) ktime_to_us(op->kt_ival2)); |
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|
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seq_printf(m, "# sent %ld ", op->frames_abs); |
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} |
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seq_putc(m, ' '); return 0; } |
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|
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static int bcm_proc_open(struct inode *inode, struct file *file) { return single_open(file, bcm_proc_show, PDE(inode)->data); |
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} |
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static const struct file_operations bcm_proc_fops = { .owner = THIS_MODULE, .open = bcm_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; |
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/* * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface * of the given bcm tx op */ static void bcm_can_tx(struct bcm_op *op) { struct sk_buff *skb; struct net_device *dev; struct can_frame *cf = &op->frames[op->currframe]; /* no target device? => exit */ if (!op->ifindex) return; dev = dev_get_by_index(&init_net, op->ifindex); if (!dev) { /* RFC: should this bcm_op remove itself here? */ return; } skb = alloc_skb(CFSIZ, gfp_any()); if (!skb) goto out; memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); /* send with loopback */ skb->dev = dev; skb->sk = op->sk; can_send(skb, 1); /* update statistics */ op->currframe++; op->frames_abs++; /* reached last frame? */ if (op->currframe >= op->nframes) op->currframe = 0; out: dev_put(dev); } /* * bcm_send_to_user - send a BCM message to the userspace * (consisting of bcm_msg_head + x CAN frames) */ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, struct can_frame *frames, int has_timestamp) { struct sk_buff *skb; struct can_frame *firstframe; struct sockaddr_can *addr; struct sock *sk = op->sk; |
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unsigned int datalen = head->nframes * CFSIZ; |
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int err; skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); if (!skb) return; memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); if (head->nframes) { /* can_frames starting here */ |
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firstframe = (struct can_frame *)skb_tail_pointer(skb); |
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memcpy(skb_put(skb, datalen), frames, datalen); /* * the BCM uses the can_dlc-element of the can_frame * structure for internal purposes. This is only * relevant for updates that are generated by the * BCM, where nframes is 1 */ if (head->nframes == 1) firstframe->can_dlc &= BCM_CAN_DLC_MASK; } if (has_timestamp) { /* restore rx timestamp */ skb->tstamp = op->rx_stamp; } /* * Put the datagram to the queue so that bcm_recvmsg() can * get it from there. We need to pass the interface index to * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb * containing the interface index. */ BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); addr = (struct sockaddr_can *)skb->cb; memset(addr, 0, sizeof(*addr)); addr->can_family = AF_CAN; addr->can_ifindex = op->rx_ifindex; err = sock_queue_rcv_skb(sk, skb); if (err < 0) { struct bcm_sock *bo = bcm_sk(sk); kfree_skb(skb); /* don't care about overflows in this statistic */ bo->dropped_usr_msgs++; } } |
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static void bcm_tx_start_timer(struct bcm_op *op) { if (op->kt_ival1.tv64 && op->count) hrtimer_start(&op->timer, ktime_add(ktime_get(), op->kt_ival1), HRTIMER_MODE_ABS); else if (op->kt_ival2.tv64) hrtimer_start(&op->timer, ktime_add(ktime_get(), op->kt_ival2), HRTIMER_MODE_ABS); } |
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static void bcm_tx_timeout_tsklet(unsigned long data) { struct bcm_op *op = (struct bcm_op *)data; struct bcm_msg_head msg_head; |
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if (op->kt_ival1.tv64 && (op->count > 0)) { |
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op->count--; |
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if (!op->count && (op->flags & TX_COUNTEVT)) { /* create notification to user */ msg_head.opcode = TX_EXPIRED; msg_head.flags = op->flags; msg_head.count = op->count; msg_head.ival1 = op->ival1; msg_head.ival2 = op->ival2; msg_head.can_id = op->can_id; msg_head.nframes = 0; bcm_send_to_user(op, &msg_head, NULL, 0); } |
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bcm_can_tx(op); |
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} else if (op->kt_ival2.tv64) bcm_can_tx(op); |
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bcm_tx_start_timer(op); |
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} /* |
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* bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
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*/ static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) { struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); tasklet_schedule(&op->tsklet); |
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return HRTIMER_NORESTART; |
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} /* * bcm_rx_changed - create a RX_CHANGED notification due to changed content */ static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) { struct bcm_msg_head head; |
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/* update statistics */ op->frames_filtered++; /* prevent statistics overflow */ if (op->frames_filtered > ULONG_MAX/100) op->frames_filtered = op->frames_abs = 0; |
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/* this element is not throttled anymore */ data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); |
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head.opcode = RX_CHANGED; head.flags = op->flags; head.count = op->count; head.ival1 = op->ival1; head.ival2 = op->ival2; head.can_id = op->can_id; head.nframes = 1; bcm_send_to_user(op, &head, data, 1); } /* * bcm_rx_update_and_send - process a detected relevant receive content change * 1. update the last received data * 2. send a notification to the user (if possible) */ static void bcm_rx_update_and_send(struct bcm_op *op, struct can_frame *lastdata, |
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const struct can_frame *rxdata) |
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{ |
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memcpy(lastdata, rxdata, CFSIZ); |
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/* mark as used and throttled by default */ lastdata->can_dlc |= (RX_RECV|RX_THR); |
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|
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/* throtteling mode inactive ? */ if (!op->kt_ival2.tv64) { |
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/* send RX_CHANGED to the user immediately */ |
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bcm_rx_changed(op, lastdata); |
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return; } |
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|
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/* with active throttling timer we are just done here */ if (hrtimer_active(&op->thrtimer)) |
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return; |
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/* first receiption with enabled throttling mode */ if (!op->kt_lastmsg.tv64) goto rx_changed_settime; |
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|
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/* got a second frame inside a potential throttle period? */ |
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if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < ktime_to_us(op->kt_ival2)) { |
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/* do not send the saved data - only start throttle timer */ |
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hrtimer_start(&op->thrtimer, ktime_add(op->kt_lastmsg, op->kt_ival2), HRTIMER_MODE_ABS); return; } /* the gap was that big, that throttling was not needed here */ |
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rx_changed_settime: bcm_rx_changed(op, lastdata); |
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op->kt_lastmsg = ktime_get(); |
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} /* * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly * received data stored in op->last_frames[] */ |
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static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
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const struct can_frame *rxdata) |
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{ /* * no one uses the MSBs of can_dlc for comparation, * so we use it here to detect the first time of reception */ if (!(op->last_frames[index].can_dlc & RX_RECV)) { /* received data for the first time => send update to user */ bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); return; } /* do a real check in can_frame data section */ if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); return; } if (op->flags & RX_CHECK_DLC) { /* do a real check in can_frame dlc */ if (rxdata->can_dlc != (op->last_frames[index].can_dlc & BCM_CAN_DLC_MASK)) { bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); return; } } } /* * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption */ static void bcm_rx_starttimer(struct bcm_op *op) { if (op->flags & RX_NO_AUTOTIMER) return; |
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if (op->kt_ival1.tv64) hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
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} |
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static void bcm_rx_timeout_tsklet(unsigned long data) |
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{ |
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struct bcm_op *op = (struct bcm_op *)data; |
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struct bcm_msg_head msg_head; |
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/* create notification to user */ |
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msg_head.opcode = RX_TIMEOUT; msg_head.flags = op->flags; msg_head.count = op->count; msg_head.ival1 = op->ival1; msg_head.ival2 = op->ival2; msg_head.can_id = op->can_id; msg_head.nframes = 0; bcm_send_to_user(op, &msg_head, NULL, 0); |
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520 521 522 523 524 525 526 527 528 529 530 |
} /* * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out */ static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) { struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); /* schedule before NET_RX_SOFTIRQ */ tasklet_hi_schedule(&op->tsklet); |
ffd980f97 [CAN]: Add broadc... |
531 532 533 534 535 536 537 538 |
/* no restart of the timer is done here! */ /* if user wants to be informed, when cyclic CAN-Messages come back */ if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { /* clear received can_frames to indicate 'nothing received' */ memset(op->last_frames, 0, op->nframes * CFSIZ); } |
73e87e02e CAN: use hrtimers... |
539 540 |
return HRTIMER_NORESTART; |
ffd980f97 [CAN]: Add broadc... |
541 542 543 |
} /* |
6e5c172cf can: update can-b... |
544 545 |
* bcm_rx_do_flush - helper for bcm_rx_thr_flush */ |
5b75c4973 can: add limit fo... |
546 547 |
static inline int bcm_rx_do_flush(struct bcm_op *op, int update, unsigned int index) |
6e5c172cf can: update can-b... |
548 549 550 551 552 553 554 555 556 557 |
{ if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { if (update) bcm_rx_changed(op, &op->last_frames[index]); return 1; } return 0; } /* |
73e87e02e CAN: use hrtimers... |
558 |
* bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172cf can: update can-b... |
559 560 561 |
* * update == 0 : just check if throttled data is available (any irq context) * update == 1 : check and send throttled data to userspace (soft_irq context) |
ffd980f97 [CAN]: Add broadc... |
562 |
*/ |
6e5c172cf can: update can-b... |
563 |
static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f97 [CAN]: Add broadc... |
564 |
{ |
73e87e02e CAN: use hrtimers... |
565 |
int updated = 0; |
ffd980f97 [CAN]: Add broadc... |
566 567 |
if (op->nframes > 1) { |
5b75c4973 can: add limit fo... |
568 |
unsigned int i; |
73e87e02e CAN: use hrtimers... |
569 |
|
ffd980f97 [CAN]: Add broadc... |
570 |
/* for MUX filter we start at index 1 */ |
6e5c172cf can: update can-b... |
571 572 |
for (i = 1; i < op->nframes; i++) updated += bcm_rx_do_flush(op, update, i); |
ffd980f97 [CAN]: Add broadc... |
573 574 575 |
} else { /* for RX_FILTER_ID and simple filter */ |
6e5c172cf can: update can-b... |
576 |
updated += bcm_rx_do_flush(op, update, 0); |
ffd980f97 [CAN]: Add broadc... |
577 |
} |
73e87e02e CAN: use hrtimers... |
578 579 580 |
return updated; } |
6e5c172cf can: update can-b... |
581 582 583 584 585 586 587 |
static void bcm_rx_thr_tsklet(unsigned long data) { struct bcm_op *op = (struct bcm_op *)data; /* push the changed data to the userspace */ bcm_rx_thr_flush(op, 1); } |
73e87e02e CAN: use hrtimers... |
588 589 590 591 592 593 594 |
/* * bcm_rx_thr_handler - the time for blocked content updates is over now: * Check for throttled data and send it to the userspace */ static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) { struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); |
6e5c172cf can: update can-b... |
595 596 597 |
tasklet_schedule(&op->thrtsklet); if (bcm_rx_thr_flush(op, 0)) { |
73e87e02e CAN: use hrtimers... |
598 599 600 601 602 603 604 |
hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); return HRTIMER_RESTART; } else { /* rearm throttle handling */ op->kt_lastmsg = ktime_set(0, 0); return HRTIMER_NORESTART; } |
ffd980f97 [CAN]: Add broadc... |
605 606 607 608 609 610 611 612 |
} /* * bcm_rx_handler - handle a CAN frame receiption */ static void bcm_rx_handler(struct sk_buff *skb, void *data) { struct bcm_op *op = (struct bcm_op *)data; |
6e5c172cf can: update can-b... |
613 |
const struct can_frame *rxframe = (struct can_frame *)skb->data; |
5b75c4973 can: add limit fo... |
614 |
unsigned int i; |
ffd980f97 [CAN]: Add broadc... |
615 616 |
/* disable timeout */ |
73e87e02e CAN: use hrtimers... |
617 |
hrtimer_cancel(&op->timer); |
ffd980f97 [CAN]: Add broadc... |
618 |
|
6e5c172cf can: update can-b... |
619 |
if (op->can_id != rxframe->can_id) |
1fa17d4ba can: omit unneede... |
620 |
return; |
ffd980f97 [CAN]: Add broadc... |
621 |
|
6e5c172cf can: update can-b... |
622 623 624 625 626 627 |
/* save rx timestamp */ op->rx_stamp = skb->tstamp; /* save originator for recvfrom() */ op->rx_ifindex = skb->dev->ifindex; /* update statistics */ op->frames_abs++; |
ffd980f97 [CAN]: Add broadc... |
628 629 630 631 |
if (op->flags & RX_RTR_FRAME) { /* send reply for RTR-request (placed in op->frames[0]) */ bcm_can_tx(op); |
1fa17d4ba can: omit unneede... |
632 |
return; |
ffd980f97 [CAN]: Add broadc... |
633 634 635 636 |
} if (op->flags & RX_FILTER_ID) { /* the easiest case */ |
6e5c172cf can: update can-b... |
637 |
bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
1fa17d4ba can: omit unneede... |
638 |
goto rx_starttimer; |
ffd980f97 [CAN]: Add broadc... |
639 640 641 642 |
} if (op->nframes == 1) { /* simple compare with index 0 */ |
6e5c172cf can: update can-b... |
643 |
bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4ba can: omit unneede... |
644 |
goto rx_starttimer; |
ffd980f97 [CAN]: Add broadc... |
645 646 647 648 649 650 651 652 653 654 655 |
} if (op->nframes > 1) { /* * multiplex compare * * find the first multiplex mask that fits. * Remark: The MUX-mask is stored in index 0 */ for (i = 1; i < op->nframes; i++) { |
6e5c172cf can: update can-b... |
656 |
if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == |
ffd980f97 [CAN]: Add broadc... |
657 658 |
(GET_U64(&op->frames[0]) & GET_U64(&op->frames[i]))) { |
6e5c172cf can: update can-b... |
659 |
bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f97 [CAN]: Add broadc... |
660 661 662 |
break; } } |
ffd980f97 [CAN]: Add broadc... |
663 |
} |
6e5c172cf can: update can-b... |
664 |
|
1fa17d4ba can: omit unneede... |
665 |
rx_starttimer: |
6e5c172cf can: update can-b... |
666 |
bcm_rx_starttimer(op); |
ffd980f97 [CAN]: Add broadc... |
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 |
} /* * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements */ static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, int ifindex) { struct bcm_op *op; list_for_each_entry(op, ops, list) { if ((op->can_id == can_id) && (op->ifindex == ifindex)) return op; } return NULL; } static void bcm_remove_op(struct bcm_op *op) { |
73e87e02e CAN: use hrtimers... |
687 688 |
hrtimer_cancel(&op->timer); hrtimer_cancel(&op->thrtimer); |
ffd980f97 [CAN]: Add broadc... |
689 |
|
6e5c172cf can: update can-b... |
690 691 692 693 694 |
if (op->tsklet.func) tasklet_kill(&op->tsklet); if (op->thrtsklet.func) tasklet_kill(&op->thrtsklet); |
ffd980f97 [CAN]: Add broadc... |
695 696 697 698 699 700 701 |
if ((op->frames) && (op->frames != &op->sframe)) kfree(op->frames); if ((op->last_frames) && (op->last_frames != &op->last_sframe)) kfree(op->last_frames); kfree(op); |
ffd980f97 [CAN]: Add broadc... |
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 |
} static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) { if (op->rx_reg_dev == dev) { can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); /* mark as removed subscription */ op->rx_reg_dev = NULL; } else printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " "mismatch %p %p ", op->rx_reg_dev, dev); } /* * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) */ static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) { struct bcm_op *op, *n; list_for_each_entry_safe(op, n, ops, list) { if ((op->can_id == can_id) && (op->ifindex == ifindex)) { /* * Don't care if we're bound or not (due to netdev * problems) can_rx_unregister() is always a save * thing to do here. */ if (op->ifindex) { /* * Only remove subscriptions that had not * been removed due to NETDEV_UNREGISTER * in bcm_notifier() */ if (op->rx_reg_dev) { struct net_device *dev; dev = dev_get_by_index(&init_net, op->ifindex); if (dev) { bcm_rx_unreg(dev, op); dev_put(dev); } } } else can_rx_unregister(NULL, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); list_del(&op->list); bcm_remove_op(op); return 1; /* done */ } } return 0; /* not found */ } /* * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) */ static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) { struct bcm_op *op, *n; list_for_each_entry_safe(op, n, ops, list) { if ((op->can_id == can_id) && (op->ifindex == ifindex)) { list_del(&op->list); bcm_remove_op(op); return 1; /* done */ } } return 0; /* not found */ } /* * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) */ static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, int ifindex) { struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex); if (!op) return -EINVAL; /* put current values into msg_head */ msg_head->flags = op->flags; msg_head->count = op->count; msg_head->ival1 = op->ival1; msg_head->ival2 = op->ival2; msg_head->nframes = op->nframes; bcm_send_to_user(op, msg_head, op->frames, 0); return MHSIZ; } /* * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) */ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, int ifindex, struct sock *sk) { struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; |
5b75c4973 can: add limit fo... |
812 813 |
unsigned int i; int err; |
ffd980f97 [CAN]: Add broadc... |
814 815 816 817 |
/* we need a real device to send frames */ if (!ifindex) return -ENODEV; |
5b75c4973 can: add limit fo... |
818 819 |
/* check nframes boundaries - we need at least one can_frame */ if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
ffd980f97 [CAN]: Add broadc... |
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 |
return -EINVAL; /* check the given can_id */ op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); if (op) { /* update existing BCM operation */ /* * Do we need more space for the can_frames than currently * allocated? -> This is a _really_ unusual use-case and * therefore (complexity / locking) it is not supported. */ if (msg_head->nframes > op->nframes) return -E2BIG; /* update can_frames content */ for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); |
7f2d38eb7 can: add sanity c... |
840 841 842 |
if (op->frames[i].can_dlc > 8) err = -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 |
if (err < 0) return err; if (msg_head->flags & TX_CP_CAN_ID) { /* copy can_id into frame */ op->frames[i].can_id = msg_head->can_id; } } } else { /* insert new BCM operation for the given can_id */ op = kzalloc(OPSIZ, GFP_KERNEL); if (!op) return -ENOMEM; op->can_id = msg_head->can_id; /* create array for can_frames and copy the data */ if (msg_head->nframes > 1) { op->frames = kmalloc(msg_head->nframes * CFSIZ, GFP_KERNEL); if (!op->frames) { kfree(op); return -ENOMEM; } } else op->frames = &op->sframe; for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); |
7f2d38eb7 can: add sanity c... |
875 876 877 |
if (op->frames[i].can_dlc > 8) err = -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 |
if (err < 0) { if (op->frames != &op->sframe) kfree(op->frames); kfree(op); return err; } if (msg_head->flags & TX_CP_CAN_ID) { /* copy can_id into frame */ op->frames[i].can_id = msg_head->can_id; } } /* tx_ops never compare with previous received messages */ op->last_frames = NULL; /* bcm_can_tx / bcm_tx_timeout_handler needs this */ op->sk = sk; op->ifindex = ifindex; /* initialize uninitialized (kzalloc) structure */ |
73e87e02e CAN: use hrtimers... |
899 900 |
hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); op->timer.function = bcm_tx_timeout_handler; |
ffd980f97 [CAN]: Add broadc... |
901 |
|
6e5c172cf can: update can-b... |
902 903 904 |
/* initialize tasklet for tx countevent notification */ tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, (unsigned long) op); |
ffd980f97 [CAN]: Add broadc... |
905 |
/* currently unused in tx_ops */ |
73e87e02e CAN: use hrtimers... |
906 |
hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f97 [CAN]: Add broadc... |
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 |
/* add this bcm_op to the list of the tx_ops */ list_add(&op->list, &bo->tx_ops); } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ if (op->nframes != msg_head->nframes) { op->nframes = msg_head->nframes; /* start multiple frame transmission with index 0 */ op->currframe = 0; } /* check flags */ op->flags = msg_head->flags; if (op->flags & TX_RESET_MULTI_IDX) { /* start multiple frame transmission with index 0 */ op->currframe = 0; } if (op->flags & SETTIMER) { /* set timer values */ op->count = msg_head->count; op->ival1 = msg_head->ival1; op->ival2 = msg_head->ival2; |
73e87e02e CAN: use hrtimers... |
933 934 |
op->kt_ival1 = timeval_to_ktime(msg_head->ival1); op->kt_ival2 = timeval_to_ktime(msg_head->ival2); |
ffd980f97 [CAN]: Add broadc... |
935 936 |
/* disable an active timer due to zero values? */ |
73e87e02e CAN: use hrtimers... |
937 938 |
if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) hrtimer_cancel(&op->timer); |
ffd980f97 [CAN]: Add broadc... |
939 |
} |
12d0d0d3a can bcm: fix inco... |
940 941 |
if (op->flags & STARTTIMER) { hrtimer_cancel(&op->timer); |
ffd980f97 [CAN]: Add broadc... |
942 943 |
/* spec: send can_frame when starting timer */ op->flags |= TX_ANNOUNCE; |
ffd980f97 [CAN]: Add broadc... |
944 |
} |
aabdcb0b5 can bcm: fix tx_s... |
945 |
if (op->flags & TX_ANNOUNCE) { |
ffd980f97 [CAN]: Add broadc... |
946 |
bcm_can_tx(op); |
12d0d0d3a can bcm: fix inco... |
947 |
if (op->count) |
aabdcb0b5 can bcm: fix tx_s... |
948 949 |
op->count--; } |
ffd980f97 [CAN]: Add broadc... |
950 |
|
12d0d0d3a can bcm: fix inco... |
951 952 |
if (op->flags & STARTTIMER) bcm_tx_start_timer(op); |
ffd980f97 [CAN]: Add broadc... |
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 |
return msg_head->nframes * CFSIZ + MHSIZ; } /* * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) */ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, int ifindex, struct sock *sk) { struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; int do_rx_register; int err = 0; if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { /* be robust against wrong usage ... */ msg_head->flags |= RX_FILTER_ID; /* ignore trailing garbage */ msg_head->nframes = 0; } |
5b75c4973 can: add limit fo... |
973 974 975 |
/* the first element contains the mux-mask => MAX_NFRAMES + 1 */ if (msg_head->nframes > MAX_NFRAMES + 1) return -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
if ((msg_head->flags & RX_RTR_FRAME) && ((msg_head->nframes != 1) || (!(msg_head->can_id & CAN_RTR_FLAG)))) return -EINVAL; /* check the given can_id */ op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex); if (op) { /* update existing BCM operation */ /* * Do we need more space for the can_frames than currently * allocated? -> This is a _really_ unusual use-case and * therefore (complexity / locking) it is not supported. */ if (msg_head->nframes > op->nframes) return -E2BIG; if (msg_head->nframes) { /* update can_frames content */ err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, msg_head->nframes * CFSIZ); if (err < 0) return err; /* clear last_frames to indicate 'nothing received' */ memset(op->last_frames, 0, msg_head->nframes * CFSIZ); } op->nframes = msg_head->nframes; /* Only an update -> do not call can_rx_register() */ do_rx_register = 0; } else { /* insert new BCM operation for the given can_id */ op = kzalloc(OPSIZ, GFP_KERNEL); if (!op) return -ENOMEM; op->can_id = msg_head->can_id; op->nframes = msg_head->nframes; if (msg_head->nframes > 1) { /* create array for can_frames and copy the data */ op->frames = kmalloc(msg_head->nframes * CFSIZ, GFP_KERNEL); if (!op->frames) { kfree(op); return -ENOMEM; } /* create and init array for received can_frames */ op->last_frames = kzalloc(msg_head->nframes * CFSIZ, GFP_KERNEL); if (!op->last_frames) { kfree(op->frames); kfree(op); return -ENOMEM; } } else { op->frames = &op->sframe; op->last_frames = &op->last_sframe; } if (msg_head->nframes) { err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, msg_head->nframes * CFSIZ); if (err < 0) { if (op->frames != &op->sframe) kfree(op->frames); if (op->last_frames != &op->last_sframe) kfree(op->last_frames); kfree(op); return err; } } /* bcm_can_tx / bcm_tx_timeout_handler needs this */ op->sk = sk; op->ifindex = ifindex; /* initialize uninitialized (kzalloc) structure */ |
73e87e02e CAN: use hrtimers... |
1061 1062 |
hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); op->timer.function = bcm_rx_timeout_handler; |
ffd980f97 [CAN]: Add broadc... |
1063 |
|
6e5c172cf can: update can-b... |
1064 1065 1066 |
/* initialize tasklet for rx timeout notification */ tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, (unsigned long) op); |
73e87e02e CAN: use hrtimers... |
1067 1068 |
hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); op->thrtimer.function = bcm_rx_thr_handler; |
ffd980f97 [CAN]: Add broadc... |
1069 |
|
6e5c172cf can: update can-b... |
1070 1071 1072 |
/* initialize tasklet for rx throttle handling */ tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, (unsigned long) op); |
ffd980f97 [CAN]: Add broadc... |
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
/* add this bcm_op to the list of the rx_ops */ list_add(&op->list, &bo->rx_ops); /* call can_rx_register() */ do_rx_register = 1; } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ /* check flags */ op->flags = msg_head->flags; if (op->flags & RX_RTR_FRAME) { /* no timers in RTR-mode */ |
73e87e02e CAN: use hrtimers... |
1087 1088 |
hrtimer_cancel(&op->thrtimer); hrtimer_cancel(&op->timer); |
ffd980f97 [CAN]: Add broadc... |
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 |
/* * funny feature in RX(!)_SETUP only for RTR-mode: * copy can_id into frame BUT without RTR-flag to * prevent a full-load-loopback-test ... ;-] */ if ((op->flags & TX_CP_CAN_ID) || (op->frames[0].can_id == op->can_id)) op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; } else { if (op->flags & SETTIMER) { /* set timer value */ op->ival1 = msg_head->ival1; op->ival2 = msg_head->ival2; |
73e87e02e CAN: use hrtimers... |
1105 1106 |
op->kt_ival1 = timeval_to_ktime(msg_head->ival1); op->kt_ival2 = timeval_to_ktime(msg_head->ival2); |
ffd980f97 [CAN]: Add broadc... |
1107 1108 |
/* disable an active timer due to zero value? */ |
73e87e02e CAN: use hrtimers... |
1109 1110 |
if (!op->kt_ival1.tv64) hrtimer_cancel(&op->timer); |
ffd980f97 [CAN]: Add broadc... |
1111 1112 |
/* |
73e87e02e CAN: use hrtimers... |
1113 1114 |
* In any case cancel the throttle timer, flush * potentially blocked msgs and reset throttle handling |
ffd980f97 [CAN]: Add broadc... |
1115 |
*/ |
73e87e02e CAN: use hrtimers... |
1116 1117 |
op->kt_lastmsg = ktime_set(0, 0); hrtimer_cancel(&op->thrtimer); |
6e5c172cf can: update can-b... |
1118 |
bcm_rx_thr_flush(op, 1); |
ffd980f97 [CAN]: Add broadc... |
1119 |
} |
73e87e02e CAN: use hrtimers... |
1120 1121 1122 |
if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
ffd980f97 [CAN]: Add broadc... |
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
} /* now we can register for can_ids, if we added a new bcm_op */ if (do_rx_register) { if (ifindex) { struct net_device *dev; dev = dev_get_by_index(&init_net, ifindex); if (dev) { err = can_rx_register(dev, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op, "bcm"); op->rx_reg_dev = dev; dev_put(dev); } } else err = can_rx_register(NULL, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op, "bcm"); if (err) { /* this bcm rx op is broken -> remove it */ list_del(&op->list); bcm_remove_op(op); return err; } } return msg_head->nframes * CFSIZ + MHSIZ; } /* * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) */ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) { struct sk_buff *skb; struct net_device *dev; int err; /* we need a real device to send frames */ if (!ifindex) return -ENODEV; skb = alloc_skb(CFSIZ, GFP_KERNEL); if (!skb) return -ENOMEM; err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ); if (err < 0) { kfree_skb(skb); return err; } dev = dev_get_by_index(&init_net, ifindex); if (!dev) { kfree_skb(skb); return -ENODEV; } skb->dev = dev; skb->sk = sk; |
7f2d38eb7 can: add sanity c... |
1188 |
err = can_send(skb, 1); /* send with loopback */ |
ffd980f97 [CAN]: Add broadc... |
1189 |
dev_put(dev); |
7f2d38eb7 can: add sanity c... |
1190 1191 |
if (err) return err; |
ffd980f97 [CAN]: Add broadc... |
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 |
return CFSIZ + MHSIZ; } /* * bcm_sendmsg - process BCM commands (opcodes) from the userspace */ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size) { struct sock *sk = sock->sk; struct bcm_sock *bo = bcm_sk(sk); int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ struct bcm_msg_head msg_head; int ret; /* read bytes or error codes as return value */ if (!bo->bound) return -ENOTCONN; |
7f2d38eb7 can: add sanity c... |
1209 1210 1211 |
/* check for valid message length from userspace */ if (size < MHSIZ || (size - MHSIZ) % CFSIZ) return -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
1212 1213 1214 1215 1216 1217 |
/* check for alternative ifindex for this bcm_op */ if (!ifindex && msg->msg_name) { /* no bound device as default => check msg_name */ struct sockaddr_can *addr = (struct sockaddr_can *)msg->msg_name; |
5e5073280 can: test size of... |
1218 1219 |
if (msg->msg_namelen < sizeof(*addr)) return -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 |
if (addr->can_family != AF_CAN) return -EINVAL; /* ifindex from sendto() */ ifindex = addr->can_ifindex; if (ifindex) { struct net_device *dev; dev = dev_get_by_index(&init_net, ifindex); if (!dev) return -ENODEV; if (dev->type != ARPHRD_CAN) { dev_put(dev); return -ENODEV; } dev_put(dev); } } /* read message head information */ ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ); if (ret < 0) return ret; lock_sock(sk); switch (msg_head.opcode) { case TX_SETUP: ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); break; case RX_SETUP: ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); break; case TX_DELETE: if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) ret = MHSIZ; else ret = -EINVAL; break; case RX_DELETE: if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) ret = MHSIZ; else ret = -EINVAL; break; case TX_READ: /* reuse msg_head for the reply to TX_READ */ msg_head.opcode = TX_STATUS; ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); break; case RX_READ: /* reuse msg_head for the reply to RX_READ */ msg_head.opcode = RX_STATUS; ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); break; case TX_SEND: |
7f2d38eb7 can: add sanity c... |
1287 1288 |
/* we need exactly one can_frame behind the msg head */ if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) |
ffd980f97 [CAN]: Add broadc... |
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
ret = -EINVAL; else ret = bcm_tx_send(msg, ifindex, sk); break; default: ret = -EINVAL; break; } release_sock(sk); return ret; } /* * notification handler for netdevice status changes */ static int bcm_notifier(struct notifier_block *nb, unsigned long msg, void *data) { struct net_device *dev = (struct net_device *)data; struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); struct sock *sk = &bo->sk; struct bcm_op *op; int notify_enodev = 0; |
721499e89 netns: Use net_eq... |
1315 |
if (!net_eq(dev_net(dev), &init_net)) |
ffd980f97 [CAN]: Add broadc... |
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 |
return NOTIFY_DONE; if (dev->type != ARPHRD_CAN) return NOTIFY_DONE; switch (msg) { case NETDEV_UNREGISTER: lock_sock(sk); /* remove device specific receive entries */ list_for_each_entry(op, &bo->rx_ops, list) if (op->rx_reg_dev == dev) bcm_rx_unreg(dev, op); /* remove device reference, if this is our bound device */ if (bo->bound && bo->ifindex == dev->ifindex) { bo->bound = 0; bo->ifindex = 0; notify_enodev = 1; } release_sock(sk); if (notify_enodev) { sk->sk_err = ENODEV; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_error_report(sk); } break; case NETDEV_DOWN: if (bo->bound && bo->ifindex == dev->ifindex) { sk->sk_err = ENETDOWN; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_error_report(sk); } } return NOTIFY_DONE; } /* * initial settings for all BCM sockets to be set at socket creation time */ static int bcm_init(struct sock *sk) { struct bcm_sock *bo = bcm_sk(sk); bo->bound = 0; bo->ifindex = 0; bo->dropped_usr_msgs = 0; bo->bcm_proc_read = NULL; INIT_LIST_HEAD(&bo->tx_ops); INIT_LIST_HEAD(&bo->rx_ops); /* set notifier */ bo->notifier.notifier_call = bcm_notifier; register_netdevice_notifier(&bo->notifier); return 0; } /* * standard socket functions */ static int bcm_release(struct socket *sock) { struct sock *sk = sock->sk; |
c6914a6f2 can: Add missing ... |
1387 |
struct bcm_sock *bo; |
ffd980f97 [CAN]: Add broadc... |
1388 |
struct bcm_op *op, *next; |
c6914a6f2 can: Add missing ... |
1389 1390 1391 1392 |
if (sk == NULL) return 0; bo = bcm_sk(sk); |
ffd980f97 [CAN]: Add broadc... |
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 |
/* remove bcm_ops, timer, rx_unregister(), etc. */ unregister_netdevice_notifier(&bo->notifier); lock_sock(sk); list_for_each_entry_safe(op, next, &bo->tx_ops, list) bcm_remove_op(op); list_for_each_entry_safe(op, next, &bo->rx_ops, list) { /* * Don't care if we're bound or not (due to netdev problems) * can_rx_unregister() is always a save thing to do here. */ if (op->ifindex) { /* * Only remove subscriptions that had not * been removed due to NETDEV_UNREGISTER * in bcm_notifier() */ if (op->rx_reg_dev) { struct net_device *dev; dev = dev_get_by_index(&init_net, op->ifindex); if (dev) { bcm_rx_unreg(dev, op); dev_put(dev); } } } else can_rx_unregister(NULL, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); bcm_remove_op(op); } /* remove procfs entry */ if (proc_dir && bo->bcm_proc_read) remove_proc_entry(bo->procname, proc_dir); /* remove device reference */ if (bo->bound) { bo->bound = 0; bo->ifindex = 0; } |
f7e5cc0c4 net/can bugfix: u... |
1439 1440 |
sock_orphan(sk); sock->sk = NULL; |
ffd980f97 [CAN]: Add broadc... |
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 |
release_sock(sk); sock_put(sk); return 0; } static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, int flags) { struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; struct sock *sk = sock->sk; struct bcm_sock *bo = bcm_sk(sk); |
6503d9616 net: check the le... |
1453 1454 |
if (len < sizeof(*addr)) return -EINVAL; |
ffd980f97 [CAN]: Add broadc... |
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 |
if (bo->bound) return -EISCONN; /* bind a device to this socket */ if (addr->can_ifindex) { struct net_device *dev; dev = dev_get_by_index(&init_net, addr->can_ifindex); if (!dev) return -ENODEV; if (dev->type != ARPHRD_CAN) { dev_put(dev); return -ENODEV; } bo->ifindex = dev->ifindex; dev_put(dev); } else { /* no interface reference for ifindex = 0 ('any' CAN device) */ bo->ifindex = 0; } bo->bound = 1; if (proc_dir) { /* unique socket address as filename */ |
9f260e0ef CAN: Use inode in... |
1483 |
sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e22 can: switch to se... |
1484 1485 1486 |
bo->bcm_proc_read = proc_create_data(bo->procname, 0644, proc_dir, &bcm_proc_fops, sk); |
ffd980f97 [CAN]: Add broadc... |
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 |
} return 0; } static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size, int flags) { struct sock *sk = sock->sk; struct sk_buff *skb; int error = 0; int noblock; int err; noblock = flags & MSG_DONTWAIT; flags &= ~MSG_DONTWAIT; skb = skb_recv_datagram(sk, flags, noblock, &error); if (!skb) return error; if (skb->len < size) size = skb->len; err = memcpy_toiovec(msg->msg_iov, skb->data, size); if (err < 0) { skb_free_datagram(sk, skb); return err; } |
3b885787e net: Generalize s... |
1515 |
sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f97 [CAN]: Add broadc... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 |
if (msg->msg_name) { msg->msg_namelen = sizeof(struct sockaddr_can); memcpy(msg->msg_name, skb->cb, msg->msg_namelen); } skb_free_datagram(sk, skb); return size; } |
53914b679 can: make struct ... |
1526 |
static const struct proto_ops bcm_ops = { |
ffd980f97 [CAN]: Add broadc... |
1527 1528 1529 1530 1531 1532 1533 1534 |
.family = PF_CAN, .release = bcm_release, .bind = sock_no_bind, .connect = bcm_connect, .socketpair = sock_no_socketpair, .accept = sock_no_accept, .getname = sock_no_getname, .poll = datagram_poll, |
53914b679 can: make struct ... |
1535 |
.ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f97 [CAN]: Add broadc... |
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 |
.listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = sock_no_setsockopt, .getsockopt = sock_no_getsockopt, .sendmsg = bcm_sendmsg, .recvmsg = bcm_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, }; static struct proto bcm_proto __read_mostly = { .name = "CAN_BCM", .owner = THIS_MODULE, .obj_size = sizeof(struct bcm_sock), .init = bcm_init, }; |
1650629d1 can: make struct ... |
1552 |
static const struct can_proto bcm_can_proto = { |
ffd980f97 [CAN]: Add broadc... |
1553 1554 |
.type = SOCK_DGRAM, .protocol = CAN_BCM, |
ffd980f97 [CAN]: Add broadc... |
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 |
.ops = &bcm_ops, .prot = &bcm_proto, }; static int __init bcm_module_init(void) { int err; printk(banner); err = can_proto_register(&bcm_can_proto); if (err < 0) { printk(KERN_ERR "can: registration of bcm protocol failed "); return err; } /* create /proc/net/can-bcm directory */ proc_dir = proc_mkdir("can-bcm", init_net.proc_net); |
ffd980f97 [CAN]: Add broadc... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 |
return 0; } static void __exit bcm_module_exit(void) { can_proto_unregister(&bcm_can_proto); if (proc_dir) proc_net_remove(&init_net, "can-bcm"); } module_init(bcm_module_init); module_exit(bcm_module_exit); |