/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Daniel Martensson
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* Dmitry.Tarnyagin / dmitry.tarnyagin@lockless.no
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* License terms: GNU General Public License (GPL) version 2.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/netdevice.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <net/rtnetlink.h>
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#include <linux/pkt_sched.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/caif_hsi.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Daniel Martensson");
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MODULE_DESCRIPTION("CAIF HSI driver");
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/* Returns the number of padding bytes for alignment. */
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#define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
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(((pow)-((x)&((pow)-1)))))
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static const struct cfhsi_config hsi_default_config = {
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/* Inactivity timeout on HSI, ms */
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.inactivity_timeout = HZ,
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/* Aggregation timeout (ms) of zero means no aggregation is done*/
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.aggregation_timeout = 1,
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/*
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* HSI link layer flow-control thresholds.
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* Threshold values for the HSI packet queue. Flow-control will be
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* asserted when the number of packets exceeds q_high_mark. It will
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* not be de-asserted before the number of packets drops below
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* q_low_mark.
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* Warning: A high threshold value might increase throughput but it
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* will at the same time prevent channel prioritization and increase
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* the risk of flooding the modem. The high threshold should be above
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* the low.
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*/
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.q_high_mark = 100,
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.q_low_mark = 50,
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/*
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* HSI padding options.
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* Warning: must be a base of 2 (& operation used) and can not be zero !
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*/
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.head_align = 4,
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.tail_align = 4,
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};
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#define ON 1
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#define OFF 0
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static LIST_HEAD(cfhsi_list);
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static void cfhsi_inactivity_tout(struct timer_list *t)
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{
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struct cfhsi *cfhsi = from_timer(cfhsi, t, inactivity_timer);
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netdev_dbg(cfhsi->ndev, "%s.\n",
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__func__);
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/* Schedule power down work queue. */
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if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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queue_work(cfhsi->wq, &cfhsi->wake_down_work);
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}
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static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi,
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const struct sk_buff *skb,
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int direction)
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{
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struct caif_payload_info *info;
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int hpad, tpad, len;
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info = (struct caif_payload_info *)&skb->cb;
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hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
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tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
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len = skb->len + hpad + tpad;
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if (direction > 0)
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cfhsi->aggregation_len += len;
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else if (direction < 0)
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cfhsi->aggregation_len -= len;
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}
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static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
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{
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int i;
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if (cfhsi->cfg.aggregation_timeout == 0)
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return true;
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for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {
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if (cfhsi->qhead[i].qlen)
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return true;
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}
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/* TODO: Use aggregation_len instead */
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if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS)
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return true;
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return false;
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}
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static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi)
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{
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struct sk_buff *skb;
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int i;
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for (i = 0; i < CFHSI_PRIO_LAST; ++i) {
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skb = skb_dequeue(&cfhsi->qhead[i]);
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if (skb)
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break;
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}
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return skb;
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}
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static int cfhsi_tx_queue_len(struct cfhsi *cfhsi)
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{
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int i, len = 0;
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for (i = 0; i < CFHSI_PRIO_LAST; ++i)
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len += skb_queue_len(&cfhsi->qhead[i]);
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return len;
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}
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static void cfhsi_abort_tx(struct cfhsi *cfhsi)
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{
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struct sk_buff *skb;
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for (;;) {
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spin_lock_bh(&cfhsi->lock);
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skb = cfhsi_dequeue(cfhsi);
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if (!skb)
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break;
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cfhsi->ndev->stats.tx_errors++;
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cfhsi->ndev->stats.tx_dropped++;
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cfhsi_update_aggregation_stats(cfhsi, skb, -1);
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spin_unlock_bh(&cfhsi->lock);
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kfree_skb(skb);
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}
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cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
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if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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mod_timer(&cfhsi->inactivity_timer,
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jiffies + cfhsi->cfg.inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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}
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static int cfhsi_flush_fifo(struct cfhsi *cfhsi)
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{
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char buffer[32]; /* Any reasonable value */
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size_t fifo_occupancy;
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int ret;
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netdev_dbg(cfhsi->ndev, "%s.\n",
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__func__);
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do {
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ret = cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
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&fifo_occupancy);
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if (ret) {
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netdev_warn(cfhsi->ndev,
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"%s: can't get FIFO occupancy: %d.\n",
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__func__, ret);
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break;
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} else if (!fifo_occupancy)
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/* No more data, exitting normally */
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break;
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fifo_occupancy = min(sizeof(buffer), fifo_occupancy);
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set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
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ret = cfhsi->ops->cfhsi_rx(buffer, fifo_occupancy,
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cfhsi->ops);
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if (ret) {
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clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
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netdev_warn(cfhsi->ndev,
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"%s: can't read data: %d.\n",
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__func__, ret);
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break;
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}
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ret = 5 * HZ;
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ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait,
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!test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret);
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|
if (ret < 0) {
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netdev_warn(cfhsi->ndev,
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"%s: can't wait for flush complete: %d.\n",
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__func__, ret);
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break;
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} else if (!ret) {
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ret = -ETIMEDOUT;
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netdev_warn(cfhsi->ndev,
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"%s: timeout waiting for flush complete.\n",
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__func__);
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break;
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}
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} while (1);
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return ret;
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}
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static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int nfrms = 0;
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int pld_len = 0;
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struct sk_buff *skb;
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u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
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skb = cfhsi_dequeue(cfhsi);
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if (!skb)
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return 0;
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/* Clear offset. */
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desc->offset = 0;
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/* Check if we can embed a CAIF frame. */
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if (skb->len < CFHSI_MAX_EMB_FRM_SZ) {
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struct caif_payload_info *info;
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int hpad;
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int tpad;
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/* Calculate needed head alignment and tail alignment. */
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info = (struct caif_payload_info *)&skb->cb;
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hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
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tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
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/* Check if frame still fits with added alignment. */
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if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) {
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u8 *pemb = desc->emb_frm;
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desc->offset = CFHSI_DESC_SHORT_SZ;
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*pemb = (u8)(hpad - 1);
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pemb += hpad;
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/* Update network statistics. */
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spin_lock_bh(&cfhsi->lock);
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cfhsi->ndev->stats.tx_packets++;
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cfhsi->ndev->stats.tx_bytes += skb->len;
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cfhsi_update_aggregation_stats(cfhsi, skb, -1);
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spin_unlock_bh(&cfhsi->lock);
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/* Copy in embedded CAIF frame. */
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skb_copy_bits(skb, 0, pemb, skb->len);
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/* Consume the SKB */
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consume_skb(skb);
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skb = NULL;
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}
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}
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/* Create payload CAIF frames. */
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while (nfrms < CFHSI_MAX_PKTS) {
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struct caif_payload_info *info;
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int hpad;
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int tpad;
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if (!skb)
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skb = cfhsi_dequeue(cfhsi);
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if (!skb)
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break;
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/* Calculate needed head alignment and tail alignment. */
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info = (struct caif_payload_info *)&skb->cb;
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hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
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tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
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/* Fill in CAIF frame length in descriptor. */
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desc->cffrm_len[nfrms] = hpad + skb->len + tpad;
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/* Fill head padding information. */
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*pfrm = (u8)(hpad - 1);
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pfrm += hpad;
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/* Update network statistics. */
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spin_lock_bh(&cfhsi->lock);
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cfhsi->ndev->stats.tx_packets++;
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cfhsi->ndev->stats.tx_bytes += skb->len;
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cfhsi_update_aggregation_stats(cfhsi, skb, -1);
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spin_unlock_bh(&cfhsi->lock);
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/* Copy in CAIF frame. */
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skb_copy_bits(skb, 0, pfrm, skb->len);
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/* Update payload length. */
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pld_len += desc->cffrm_len[nfrms];
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/* Update frame pointer. */
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pfrm += skb->len + tpad;
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/* Consume the SKB */
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consume_skb(skb);
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skb = NULL;
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/* Update number of frames. */
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nfrms++;
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}
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/* Unused length fields should be zero-filled (according to SPEC). */
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while (nfrms < CFHSI_MAX_PKTS) {
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desc->cffrm_len[nfrms] = 0x0000;
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nfrms++;
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}
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/* Check if we can piggy-back another descriptor. */
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if (cfhsi_can_send_aggregate(cfhsi))
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desc->header |= CFHSI_PIGGY_DESC;
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else
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desc->header &= ~CFHSI_PIGGY_DESC;
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return CFHSI_DESC_SZ + pld_len;
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}
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static void cfhsi_start_tx(struct cfhsi *cfhsi)
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{
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struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
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int len, res;
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netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
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if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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return;
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do {
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/* Create HSI frame. */
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len = cfhsi_tx_frm(desc, cfhsi);
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if (!len) {
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spin_lock_bh(&cfhsi->lock);
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if (unlikely(cfhsi_tx_queue_len(cfhsi))) {
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spin_unlock_bh(&cfhsi->lock);
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res = -EAGAIN;
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continue;
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}
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cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
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/* Start inactivity timer. */
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mod_timer(&cfhsi->inactivity_timer,
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jiffies + cfhsi->cfg.inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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break;
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}
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/* Set up new transfer. */
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res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
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if (WARN_ON(res < 0))
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netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
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__func__, res);
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} while (res < 0);
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}
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static void cfhsi_tx_done(struct cfhsi *cfhsi)
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{
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netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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return;
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/*
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* Send flow on if flow off has been previously signalled
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* and number of packets is below low water mark.
|
*/
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spin_lock_bh(&cfhsi->lock);
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if (cfhsi->flow_off_sent &&
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cfhsi_tx_queue_len(cfhsi) <= cfhsi->cfg.q_low_mark &&
|
cfhsi->cfdev.flowctrl) {
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|
cfhsi->flow_off_sent = 0;
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cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
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}
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|
if (cfhsi_can_send_aggregate(cfhsi)) {
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spin_unlock_bh(&cfhsi->lock);
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cfhsi_start_tx(cfhsi);
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} else {
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mod_timer(&cfhsi->aggregation_timer,
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jiffies + cfhsi->cfg.aggregation_timeout);
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spin_unlock_bh(&cfhsi->lock);
|
}
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|
return;
|
}
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static void cfhsi_tx_done_cb(struct cfhsi_cb_ops *cb_ops)
|
{
|
struct cfhsi *cfhsi;
|
|
cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
|
netdev_dbg(cfhsi->ndev, "%s.\n",
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__func__);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
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cfhsi_tx_done(cfhsi);
|
}
|
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static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int xfer_sz = 0;
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int nfrms = 0;
|
u16 *plen = NULL;
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u8 *pfrm = NULL;
|
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if ((desc->header & ~CFHSI_PIGGY_DESC) ||
|
(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
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netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n",
|
__func__);
|
return -EPROTO;
|
}
|
|
/* Check for embedded CAIF frame. */
|
if (desc->offset) {
|
struct sk_buff *skb;
|
int len = 0;
|
pfrm = ((u8 *)desc) + desc->offset;
|
|
/* Remove offset padding. */
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pfrm += *pfrm + 1;
|
|
/* Read length of CAIF frame (little endian). */
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len = *pfrm;
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len |= ((*(pfrm+1)) << 8) & 0xFF00;
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len += 2; /* Add FCS fields. */
|
|
/* Sanity check length of CAIF frame. */
|
if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
|
netdev_err(cfhsi->ndev, "%s: Invalid length.\n",
|
__func__);
|
return -EPROTO;
|
}
|
|
/* Allocate SKB (OK even in IRQ context). */
|
skb = alloc_skb(len + 1, GFP_ATOMIC);
|
if (!skb) {
|
netdev_err(cfhsi->ndev, "%s: Out of memory !\n",
|
__func__);
|
return -ENOMEM;
|
}
|
caif_assert(skb != NULL);
|
|
skb_put_data(skb, pfrm, len);
|
|
skb->protocol = htons(ETH_P_CAIF);
|
skb_reset_mac_header(skb);
|
skb->dev = cfhsi->ndev;
|
|
/*
|
* We are in a callback handler and
|
* unfortunately we don't know what context we're
|
* running in.
|
*/
|
if (in_interrupt())
|
netif_rx(skb);
|
else
|
netif_rx_ni(skb);
|
|
/* Update network statistics. */
|
cfhsi->ndev->stats.rx_packets++;
|
cfhsi->ndev->stats.rx_bytes += len;
|
}
|
|
/* Calculate transfer length. */
|
plen = desc->cffrm_len;
|
while (nfrms < CFHSI_MAX_PKTS && *plen) {
|
xfer_sz += *plen;
|
plen++;
|
nfrms++;
|
}
|
|
/* Check for piggy-backed descriptor. */
|
if (desc->header & CFHSI_PIGGY_DESC)
|
xfer_sz += CFHSI_DESC_SZ;
|
|
if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) {
|
netdev_err(cfhsi->ndev,
|
"%s: Invalid payload len: %d, ignored.\n",
|
__func__, xfer_sz);
|
return -EPROTO;
|
}
|
return xfer_sz;
|
}
|
|
static int cfhsi_rx_desc_len(struct cfhsi_desc *desc)
|
{
|
int xfer_sz = 0;
|
int nfrms = 0;
|
u16 *plen;
|
|
if ((desc->header & ~CFHSI_PIGGY_DESC) ||
|
(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
|
|
pr_err("Invalid descriptor. %x %x\n", desc->header,
|
desc->offset);
|
return -EPROTO;
|
}
|
|
/* Calculate transfer length. */
|
plen = desc->cffrm_len;
|
while (nfrms < CFHSI_MAX_PKTS && *plen) {
|
xfer_sz += *plen;
|
plen++;
|
nfrms++;
|
}
|
|
if (xfer_sz % 4) {
|
pr_err("Invalid payload len: %d, ignored.\n", xfer_sz);
|
return -EPROTO;
|
}
|
return xfer_sz;
|
}
|
|
static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
|
{
|
int rx_sz = 0;
|
int nfrms = 0;
|
u16 *plen = NULL;
|
u8 *pfrm = NULL;
|
|
/* Sanity check header and offset. */
|
if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) ||
|
(desc->offset > CFHSI_MAX_EMB_FRM_SZ))) {
|
netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n",
|
__func__);
|
return -EPROTO;
|
}
|
|
/* Set frame pointer to start of payload. */
|
pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
|
plen = desc->cffrm_len;
|
|
/* Skip already processed frames. */
|
while (nfrms < cfhsi->rx_state.nfrms) {
|
pfrm += *plen;
|
rx_sz += *plen;
|
plen++;
|
nfrms++;
|
}
|
|
/* Parse payload. */
|
while (nfrms < CFHSI_MAX_PKTS && *plen) {
|
struct sk_buff *skb;
|
u8 *pcffrm = NULL;
|
int len;
|
|
/* CAIF frame starts after head padding. */
|
pcffrm = pfrm + *pfrm + 1;
|
|
/* Read length of CAIF frame (little endian). */
|
len = *pcffrm;
|
len |= ((*(pcffrm + 1)) << 8) & 0xFF00;
|
len += 2; /* Add FCS fields. */
|
|
/* Sanity check length of CAIF frames. */
|
if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
|
netdev_err(cfhsi->ndev, "%s: Invalid length.\n",
|
__func__);
|
return -EPROTO;
|
}
|
|
/* Allocate SKB (OK even in IRQ context). */
|
skb = alloc_skb(len + 1, GFP_ATOMIC);
|
if (!skb) {
|
netdev_err(cfhsi->ndev, "%s: Out of memory !\n",
|
__func__);
|
cfhsi->rx_state.nfrms = nfrms;
|
return -ENOMEM;
|
}
|
caif_assert(skb != NULL);
|
|
skb_put_data(skb, pcffrm, len);
|
|
skb->protocol = htons(ETH_P_CAIF);
|
skb_reset_mac_header(skb);
|
skb->dev = cfhsi->ndev;
|
|
/*
|
* We're called in callback from HSI
|
* and don't know the context we're running in.
|
*/
|
if (in_interrupt())
|
netif_rx(skb);
|
else
|
netif_rx_ni(skb);
|
|
/* Update network statistics. */
|
cfhsi->ndev->stats.rx_packets++;
|
cfhsi->ndev->stats.rx_bytes += len;
|
|
pfrm += *plen;
|
rx_sz += *plen;
|
plen++;
|
nfrms++;
|
}
|
|
return rx_sz;
|
}
|
|
static void cfhsi_rx_done(struct cfhsi *cfhsi)
|
{
|
int res;
|
int desc_pld_len = 0, rx_len, rx_state;
|
struct cfhsi_desc *desc = NULL;
|
u8 *rx_ptr, *rx_buf;
|
struct cfhsi_desc *piggy_desc = NULL;
|
|
desc = (struct cfhsi_desc *)cfhsi->rx_buf;
|
|
netdev_dbg(cfhsi->ndev, "%s\n", __func__);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
|
|
/* Update inactivity timer if pending. */
|
spin_lock_bh(&cfhsi->lock);
|
mod_timer_pending(&cfhsi->inactivity_timer,
|
jiffies + cfhsi->cfg.inactivity_timeout);
|
spin_unlock_bh(&cfhsi->lock);
|
|
if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
|
desc_pld_len = cfhsi_rx_desc_len(desc);
|
|
if (desc_pld_len < 0)
|
goto out_of_sync;
|
|
rx_buf = cfhsi->rx_buf;
|
rx_len = desc_pld_len;
|
if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC))
|
rx_len += CFHSI_DESC_SZ;
|
if (desc_pld_len == 0)
|
rx_buf = cfhsi->rx_flip_buf;
|
} else {
|
rx_buf = cfhsi->rx_flip_buf;
|
|
rx_len = CFHSI_DESC_SZ;
|
if (cfhsi->rx_state.pld_len > 0 &&
|
(desc->header & CFHSI_PIGGY_DESC)) {
|
|
piggy_desc = (struct cfhsi_desc *)
|
(desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ +
|
cfhsi->rx_state.pld_len);
|
|
cfhsi->rx_state.piggy_desc = true;
|
|
/* Extract payload len from piggy-backed descriptor. */
|
desc_pld_len = cfhsi_rx_desc_len(piggy_desc);
|
if (desc_pld_len < 0)
|
goto out_of_sync;
|
|
if (desc_pld_len > 0) {
|
rx_len = desc_pld_len;
|
if (piggy_desc->header & CFHSI_PIGGY_DESC)
|
rx_len += CFHSI_DESC_SZ;
|
}
|
|
/*
|
* Copy needed information from the piggy-backed
|
* descriptor to the descriptor in the start.
|
*/
|
memcpy(rx_buf, (u8 *)piggy_desc,
|
CFHSI_DESC_SHORT_SZ);
|
}
|
}
|
|
if (desc_pld_len) {
|
rx_state = CFHSI_RX_STATE_PAYLOAD;
|
rx_ptr = rx_buf + CFHSI_DESC_SZ;
|
} else {
|
rx_state = CFHSI_RX_STATE_DESC;
|
rx_ptr = rx_buf;
|
rx_len = CFHSI_DESC_SZ;
|
}
|
|
/* Initiate next read */
|
if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) {
|
/* Set up new transfer. */
|
netdev_dbg(cfhsi->ndev, "%s: Start RX.\n",
|
__func__);
|
|
res = cfhsi->ops->cfhsi_rx(rx_ptr, rx_len,
|
cfhsi->ops);
|
if (WARN_ON(res < 0)) {
|
netdev_err(cfhsi->ndev, "%s: RX error %d.\n",
|
__func__, res);
|
cfhsi->ndev->stats.rx_errors++;
|
cfhsi->ndev->stats.rx_dropped++;
|
}
|
}
|
|
if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
|
/* Extract payload from descriptor */
|
if (cfhsi_rx_desc(desc, cfhsi) < 0)
|
goto out_of_sync;
|
} else {
|
/* Extract payload */
|
if (cfhsi_rx_pld(desc, cfhsi) < 0)
|
goto out_of_sync;
|
if (piggy_desc) {
|
/* Extract any payload in piggyback descriptor. */
|
if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0)
|
goto out_of_sync;
|
/* Mark no embedded frame after extracting it */
|
piggy_desc->offset = 0;
|
}
|
}
|
|
/* Update state info */
|
memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
|
cfhsi->rx_state.state = rx_state;
|
cfhsi->rx_ptr = rx_ptr;
|
cfhsi->rx_len = rx_len;
|
cfhsi->rx_state.pld_len = desc_pld_len;
|
cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC;
|
|
if (rx_buf != cfhsi->rx_buf)
|
swap(cfhsi->rx_buf, cfhsi->rx_flip_buf);
|
return;
|
|
out_of_sync:
|
netdev_err(cfhsi->ndev, "%s: Out of sync.\n", __func__);
|
print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
|
cfhsi->rx_buf, CFHSI_DESC_SZ);
|
schedule_work(&cfhsi->out_of_sync_work);
|
}
|
|
static void cfhsi_rx_slowpath(struct timer_list *t)
|
{
|
struct cfhsi *cfhsi = from_timer(cfhsi, t, rx_slowpath_timer);
|
|
netdev_dbg(cfhsi->ndev, "%s.\n",
|
__func__);
|
|
cfhsi_rx_done(cfhsi);
|
}
|
|
static void cfhsi_rx_done_cb(struct cfhsi_cb_ops *cb_ops)
|
{
|
struct cfhsi *cfhsi;
|
|
cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
|
netdev_dbg(cfhsi->ndev, "%s.\n",
|
__func__);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
|
|
if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits))
|
wake_up_interruptible(&cfhsi->flush_fifo_wait);
|
else
|
cfhsi_rx_done(cfhsi);
|
}
|
|
static void cfhsi_wake_up(struct work_struct *work)
|
{
|
struct cfhsi *cfhsi = NULL;
|
int res;
|
int len;
|
long ret;
|
|
cfhsi = container_of(work, struct cfhsi, wake_up_work);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
|
|
if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) {
|
/* It happenes when wakeup is requested by
|
* both ends at the same time. */
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
return;
|
}
|
|
/* Activate wake line. */
|
cfhsi->ops->cfhsi_wake_up(cfhsi->ops);
|
|
netdev_dbg(cfhsi->ndev, "%s: Start waiting.\n",
|
__func__);
|
|
/* Wait for acknowledge. */
|
ret = CFHSI_WAKE_TOUT;
|
ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait,
|
test_and_clear_bit(CFHSI_WAKE_UP_ACK,
|
&cfhsi->bits), ret);
|
if (unlikely(ret < 0)) {
|
/* Interrupted by signal. */
|
netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n",
|
__func__, ret);
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
|
return;
|
} else if (!ret) {
|
bool ca_wake = false;
|
size_t fifo_occupancy = 0;
|
|
/* Wakeup timeout */
|
netdev_dbg(cfhsi->ndev, "%s: Timeout.\n",
|
__func__);
|
|
/* Check FIFO to check if modem has sent something. */
|
WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
|
&fifo_occupancy));
|
|
netdev_dbg(cfhsi->ndev, "%s: Bytes in FIFO: %u.\n",
|
__func__, (unsigned) fifo_occupancy);
|
|
/* Check if we misssed the interrupt. */
|
WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops,
|
&ca_wake));
|
|
if (ca_wake) {
|
netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n",
|
__func__);
|
|
/* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
/* Continue execution. */
|
goto wake_ack;
|
}
|
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
|
return;
|
}
|
wake_ack:
|
netdev_dbg(cfhsi->ndev, "%s: Woken.\n",
|
__func__);
|
|
/* Clear power up bit. */
|
set_bit(CFHSI_AWAKE, &cfhsi->bits);
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
|
/* Resume read operation. */
|
netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", __func__);
|
res = cfhsi->ops->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->ops);
|
|
if (WARN_ON(res < 0))
|
netdev_err(cfhsi->ndev, "%s: RX err %d.\n", __func__, res);
|
|
/* Clear power up acknowledment. */
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
|
spin_lock_bh(&cfhsi->lock);
|
|
/* Resume transmit if queues are not empty. */
|
if (!cfhsi_tx_queue_len(cfhsi)) {
|
netdev_dbg(cfhsi->ndev, "%s: Peer wake, start timer.\n",
|
__func__);
|
/* Start inactivity timer. */
|
mod_timer(&cfhsi->inactivity_timer,
|
jiffies + cfhsi->cfg.inactivity_timeout);
|
spin_unlock_bh(&cfhsi->lock);
|
return;
|
}
|
|
netdev_dbg(cfhsi->ndev, "%s: Host wake.\n",
|
__func__);
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
/* Create HSI frame. */
|
len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi);
|
|
if (likely(len > 0)) {
|
/* Set up new transfer. */
|
res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
|
if (WARN_ON(res < 0)) {
|
netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
|
__func__, res);
|
cfhsi_abort_tx(cfhsi);
|
}
|
} else {
|
netdev_err(cfhsi->ndev,
|
"%s: Failed to create HSI frame: %d.\n",
|
__func__, len);
|
}
|
}
|
|
static void cfhsi_wake_down(struct work_struct *work)
|
{
|
long ret;
|
struct cfhsi *cfhsi = NULL;
|
size_t fifo_occupancy = 0;
|
int retry = CFHSI_WAKE_TOUT;
|
|
cfhsi = container_of(work, struct cfhsi, wake_down_work);
|
netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
|
|
/* Deactivate wake line. */
|
cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
|
|
/* Wait for acknowledge. */
|
ret = CFHSI_WAKE_TOUT;
|
ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait,
|
test_and_clear_bit(CFHSI_WAKE_DOWN_ACK,
|
&cfhsi->bits), ret);
|
if (ret < 0) {
|
/* Interrupted by signal. */
|
netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n",
|
__func__, ret);
|
return;
|
} else if (!ret) {
|
bool ca_wake = true;
|
|
/* Timeout */
|
netdev_err(cfhsi->ndev, "%s: Timeout.\n", __func__);
|
|
/* Check if we misssed the interrupt. */
|
WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops,
|
&ca_wake));
|
if (!ca_wake)
|
netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n",
|
__func__);
|
}
|
|
/* Check FIFO occupancy. */
|
while (retry) {
|
WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
|
&fifo_occupancy));
|
|
if (!fifo_occupancy)
|
break;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
schedule_timeout(1);
|
retry--;
|
}
|
|
if (!retry)
|
netdev_err(cfhsi->ndev, "%s: FIFO Timeout.\n", __func__);
|
|
/* Clear AWAKE condition. */
|
clear_bit(CFHSI_AWAKE, &cfhsi->bits);
|
|
/* Cancel pending RX requests. */
|
cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops);
|
}
|
|
static void cfhsi_out_of_sync(struct work_struct *work)
|
{
|
struct cfhsi *cfhsi = NULL;
|
|
cfhsi = container_of(work, struct cfhsi, out_of_sync_work);
|
|
rtnl_lock();
|
dev_close(cfhsi->ndev);
|
rtnl_unlock();
|
}
|
|
static void cfhsi_wake_up_cb(struct cfhsi_cb_ops *cb_ops)
|
{
|
struct cfhsi *cfhsi = NULL;
|
|
cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
|
netdev_dbg(cfhsi->ndev, "%s.\n",
|
__func__);
|
|
set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
wake_up_interruptible(&cfhsi->wake_up_wait);
|
|
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
|
return;
|
|
/* Schedule wake up work queue if the peer initiates. */
|
if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
|
queue_work(cfhsi->wq, &cfhsi->wake_up_work);
|
}
|
|
static void cfhsi_wake_down_cb(struct cfhsi_cb_ops *cb_ops)
|
{
|
struct cfhsi *cfhsi = NULL;
|
|
cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
|
netdev_dbg(cfhsi->ndev, "%s.\n",
|
__func__);
|
|
/* Initiating low power is only permitted by the host (us). */
|
set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
|
wake_up_interruptible(&cfhsi->wake_down_wait);
|
}
|
|
static void cfhsi_aggregation_tout(struct timer_list *t)
|
{
|
struct cfhsi *cfhsi = from_timer(cfhsi, t, aggregation_timer);
|
|
netdev_dbg(cfhsi->ndev, "%s.\n",
|
__func__);
|
|
cfhsi_start_tx(cfhsi);
|
}
|
|
static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
|
{
|
struct cfhsi *cfhsi = NULL;
|
int start_xfer = 0;
|
int timer_active;
|
int prio;
|
|
if (!dev)
|
return -EINVAL;
|
|
cfhsi = netdev_priv(dev);
|
|
switch (skb->priority) {
|
case TC_PRIO_BESTEFFORT:
|
case TC_PRIO_FILLER:
|
case TC_PRIO_BULK:
|
prio = CFHSI_PRIO_BEBK;
|
break;
|
case TC_PRIO_INTERACTIVE_BULK:
|
prio = CFHSI_PRIO_VI;
|
break;
|
case TC_PRIO_INTERACTIVE:
|
prio = CFHSI_PRIO_VO;
|
break;
|
case TC_PRIO_CONTROL:
|
default:
|
prio = CFHSI_PRIO_CTL;
|
break;
|
}
|
|
spin_lock_bh(&cfhsi->lock);
|
|
/* Update aggregation statistics */
|
cfhsi_update_aggregation_stats(cfhsi, skb, 1);
|
|
/* Queue the SKB */
|
skb_queue_tail(&cfhsi->qhead[prio], skb);
|
|
/* Sanity check; xmit should not be called after unregister_netdev */
|
if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
|
spin_unlock_bh(&cfhsi->lock);
|
cfhsi_abort_tx(cfhsi);
|
return -EINVAL;
|
}
|
|
/* Send flow off if number of packets is above high water mark. */
|
if (!cfhsi->flow_off_sent &&
|
cfhsi_tx_queue_len(cfhsi) > cfhsi->cfg.q_high_mark &&
|
cfhsi->cfdev.flowctrl) {
|
cfhsi->flow_off_sent = 1;
|
cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
|
}
|
|
if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) {
|
cfhsi->tx_state = CFHSI_TX_STATE_XFER;
|
start_xfer = 1;
|
}
|
|
if (!start_xfer) {
|
/* Send aggregate if it is possible */
|
bool aggregate_ready =
|
cfhsi_can_send_aggregate(cfhsi) &&
|
del_timer(&cfhsi->aggregation_timer) > 0;
|
spin_unlock_bh(&cfhsi->lock);
|
if (aggregate_ready)
|
cfhsi_start_tx(cfhsi);
|
return 0;
|
}
|
|
/* Delete inactivity timer if started. */
|
timer_active = del_timer_sync(&cfhsi->inactivity_timer);
|
|
spin_unlock_bh(&cfhsi->lock);
|
|
if (timer_active) {
|
struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
|
int len;
|
int res;
|
|
/* Create HSI frame. */
|
len = cfhsi_tx_frm(desc, cfhsi);
|
WARN_ON(!len);
|
|
/* Set up new transfer. */
|
res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
|
if (WARN_ON(res < 0)) {
|
netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
|
__func__, res);
|
cfhsi_abort_tx(cfhsi);
|
}
|
} else {
|
/* Schedule wake up work queue if the we initiate. */
|
if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
|
queue_work(cfhsi->wq, &cfhsi->wake_up_work);
|
}
|
|
return 0;
|
}
|
|
static const struct net_device_ops cfhsi_netdevops;
|
|
static void cfhsi_setup(struct net_device *dev)
|
{
|
int i;
|
struct cfhsi *cfhsi = netdev_priv(dev);
|
dev->features = 0;
|
dev->type = ARPHRD_CAIF;
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
|
dev->priv_flags |= IFF_NO_QUEUE;
|
dev->needs_free_netdev = true;
|
dev->netdev_ops = &cfhsi_netdevops;
|
for (i = 0; i < CFHSI_PRIO_LAST; ++i)
|
skb_queue_head_init(&cfhsi->qhead[i]);
|
cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
|
cfhsi->cfdev.use_frag = false;
|
cfhsi->cfdev.use_stx = false;
|
cfhsi->cfdev.use_fcs = false;
|
cfhsi->ndev = dev;
|
cfhsi->cfg = hsi_default_config;
|
}
|
|
static int cfhsi_open(struct net_device *ndev)
|
{
|
struct cfhsi *cfhsi = netdev_priv(ndev);
|
int res;
|
|
clear_bit(CFHSI_SHUTDOWN, &cfhsi->bits);
|
|
/* Initialize state vaiables. */
|
cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
|
cfhsi->rx_state.state = CFHSI_RX_STATE_DESC;
|
|
/* Set flow info */
|
cfhsi->flow_off_sent = 0;
|
|
/*
|
* Allocate a TX buffer with the size of a HSI packet descriptors
|
* and the necessary room for CAIF payload frames.
|
*/
|
cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL);
|
if (!cfhsi->tx_buf) {
|
res = -ENODEV;
|
goto err_alloc_tx;
|
}
|
|
/*
|
* Allocate a RX buffer with the size of two HSI packet descriptors and
|
* the necessary room for CAIF payload frames.
|
*/
|
cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
|
if (!cfhsi->rx_buf) {
|
res = -ENODEV;
|
goto err_alloc_rx;
|
}
|
|
cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
|
if (!cfhsi->rx_flip_buf) {
|
res = -ENODEV;
|
goto err_alloc_rx_flip;
|
}
|
|
/* Initialize aggregation timeout */
|
cfhsi->cfg.aggregation_timeout = hsi_default_config.aggregation_timeout;
|
|
/* Initialize recieve vaiables. */
|
cfhsi->rx_ptr = cfhsi->rx_buf;
|
cfhsi->rx_len = CFHSI_DESC_SZ;
|
|
/* Initialize spin locks. */
|
spin_lock_init(&cfhsi->lock);
|
|
/* Set up the driver. */
|
cfhsi->cb_ops.tx_done_cb = cfhsi_tx_done_cb;
|
cfhsi->cb_ops.rx_done_cb = cfhsi_rx_done_cb;
|
cfhsi->cb_ops.wake_up_cb = cfhsi_wake_up_cb;
|
cfhsi->cb_ops.wake_down_cb = cfhsi_wake_down_cb;
|
|
/* Initialize the work queues. */
|
INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up);
|
INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down);
|
INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync);
|
|
/* Clear all bit fields. */
|
clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
|
clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
|
clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
|
clear_bit(CFHSI_AWAKE, &cfhsi->bits);
|
|
/* Create work thread. */
|
cfhsi->wq = alloc_ordered_workqueue(cfhsi->ndev->name, WQ_MEM_RECLAIM);
|
if (!cfhsi->wq) {
|
netdev_err(cfhsi->ndev, "%s: Failed to create work queue.\n",
|
__func__);
|
res = -ENODEV;
|
goto err_create_wq;
|
}
|
|
/* Initialize wait queues. */
|
init_waitqueue_head(&cfhsi->wake_up_wait);
|
init_waitqueue_head(&cfhsi->wake_down_wait);
|
init_waitqueue_head(&cfhsi->flush_fifo_wait);
|
|
/* Setup the inactivity timer. */
|
timer_setup(&cfhsi->inactivity_timer, cfhsi_inactivity_tout, 0);
|
/* Setup the slowpath RX timer. */
|
timer_setup(&cfhsi->rx_slowpath_timer, cfhsi_rx_slowpath, 0);
|
/* Setup the aggregation timer. */
|
timer_setup(&cfhsi->aggregation_timer, cfhsi_aggregation_tout, 0);
|
|
/* Activate HSI interface. */
|
res = cfhsi->ops->cfhsi_up(cfhsi->ops);
|
if (res) {
|
netdev_err(cfhsi->ndev,
|
"%s: can't activate HSI interface: %d.\n",
|
__func__, res);
|
goto err_activate;
|
}
|
|
/* Flush FIFO */
|
res = cfhsi_flush_fifo(cfhsi);
|
if (res) {
|
netdev_err(cfhsi->ndev, "%s: Can't flush FIFO: %d.\n",
|
__func__, res);
|
goto err_net_reg;
|
}
|
return res;
|
|
err_net_reg:
|
cfhsi->ops->cfhsi_down(cfhsi->ops);
|
err_activate:
|
destroy_workqueue(cfhsi->wq);
|
err_create_wq:
|
kfree(cfhsi->rx_flip_buf);
|
err_alloc_rx_flip:
|
kfree(cfhsi->rx_buf);
|
err_alloc_rx:
|
kfree(cfhsi->tx_buf);
|
err_alloc_tx:
|
return res;
|
}
|
|
static int cfhsi_close(struct net_device *ndev)
|
{
|
struct cfhsi *cfhsi = netdev_priv(ndev);
|
u8 *tx_buf, *rx_buf, *flip_buf;
|
|
/* going to shutdown driver */
|
set_bit(CFHSI_SHUTDOWN, &cfhsi->bits);
|
|
/* Delete timers if pending */
|
del_timer_sync(&cfhsi->inactivity_timer);
|
del_timer_sync(&cfhsi->rx_slowpath_timer);
|
del_timer_sync(&cfhsi->aggregation_timer);
|
|
/* Cancel pending RX request (if any) */
|
cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops);
|
|
/* Destroy workqueue */
|
destroy_workqueue(cfhsi->wq);
|
|
/* Store bufferes: will be freed later. */
|
tx_buf = cfhsi->tx_buf;
|
rx_buf = cfhsi->rx_buf;
|
flip_buf = cfhsi->rx_flip_buf;
|
/* Flush transmit queues. */
|
cfhsi_abort_tx(cfhsi);
|
|
/* Deactivate interface */
|
cfhsi->ops->cfhsi_down(cfhsi->ops);
|
|
/* Free buffers. */
|
kfree(tx_buf);
|
kfree(rx_buf);
|
kfree(flip_buf);
|
return 0;
|
}
|
|
static void cfhsi_uninit(struct net_device *dev)
|
{
|
struct cfhsi *cfhsi = netdev_priv(dev);
|
ASSERT_RTNL();
|
symbol_put(cfhsi_get_device);
|
list_del(&cfhsi->list);
|
}
|
|
static const struct net_device_ops cfhsi_netdevops = {
|
.ndo_uninit = cfhsi_uninit,
|
.ndo_open = cfhsi_open,
|
.ndo_stop = cfhsi_close,
|
.ndo_start_xmit = cfhsi_xmit
|
};
|
|
static void cfhsi_netlink_parms(struct nlattr *data[], struct cfhsi *cfhsi)
|
{
|
int i;
|
|
if (!data) {
|
pr_debug("no params data found\n");
|
return;
|
}
|
|
i = __IFLA_CAIF_HSI_INACTIVITY_TOUT;
|
/*
|
* Inactivity timeout in millisecs. Lowest possible value is 1,
|
* and highest possible is NEXT_TIMER_MAX_DELTA.
|
*/
|
if (data[i]) {
|
u32 inactivity_timeout = nla_get_u32(data[i]);
|
/* Pre-calculate inactivity timeout. */
|
cfhsi->cfg.inactivity_timeout = inactivity_timeout * HZ / 1000;
|
if (cfhsi->cfg.inactivity_timeout == 0)
|
cfhsi->cfg.inactivity_timeout = 1;
|
else if (cfhsi->cfg.inactivity_timeout > NEXT_TIMER_MAX_DELTA)
|
cfhsi->cfg.inactivity_timeout = NEXT_TIMER_MAX_DELTA;
|
}
|
|
i = __IFLA_CAIF_HSI_AGGREGATION_TOUT;
|
if (data[i])
|
cfhsi->cfg.aggregation_timeout = nla_get_u32(data[i]);
|
|
i = __IFLA_CAIF_HSI_HEAD_ALIGN;
|
if (data[i])
|
cfhsi->cfg.head_align = nla_get_u32(data[i]);
|
|
i = __IFLA_CAIF_HSI_TAIL_ALIGN;
|
if (data[i])
|
cfhsi->cfg.tail_align = nla_get_u32(data[i]);
|
|
i = __IFLA_CAIF_HSI_QHIGH_WATERMARK;
|
if (data[i])
|
cfhsi->cfg.q_high_mark = nla_get_u32(data[i]);
|
|
i = __IFLA_CAIF_HSI_QLOW_WATERMARK;
|
if (data[i])
|
cfhsi->cfg.q_low_mark = nla_get_u32(data[i]);
|
}
|
|
static int caif_hsi_changelink(struct net_device *dev, struct nlattr *tb[],
|
struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
cfhsi_netlink_parms(data, netdev_priv(dev));
|
netdev_state_change(dev);
|
return 0;
|
}
|
|
static const struct nla_policy caif_hsi_policy[__IFLA_CAIF_HSI_MAX + 1] = {
|
[__IFLA_CAIF_HSI_INACTIVITY_TOUT] = { .type = NLA_U32, .len = 4 },
|
[__IFLA_CAIF_HSI_AGGREGATION_TOUT] = { .type = NLA_U32, .len = 4 },
|
[__IFLA_CAIF_HSI_HEAD_ALIGN] = { .type = NLA_U32, .len = 4 },
|
[__IFLA_CAIF_HSI_TAIL_ALIGN] = { .type = NLA_U32, .len = 4 },
|
[__IFLA_CAIF_HSI_QHIGH_WATERMARK] = { .type = NLA_U32, .len = 4 },
|
[__IFLA_CAIF_HSI_QLOW_WATERMARK] = { .type = NLA_U32, .len = 4 },
|
};
|
|
static size_t caif_hsi_get_size(const struct net_device *dev)
|
{
|
int i;
|
size_t s = 0;
|
for (i = __IFLA_CAIF_HSI_UNSPEC + 1; i < __IFLA_CAIF_HSI_MAX; i++)
|
s += nla_total_size(caif_hsi_policy[i].len);
|
return s;
|
}
|
|
static int caif_hsi_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
{
|
struct cfhsi *cfhsi = netdev_priv(dev);
|
|
if (nla_put_u32(skb, __IFLA_CAIF_HSI_INACTIVITY_TOUT,
|
cfhsi->cfg.inactivity_timeout) ||
|
nla_put_u32(skb, __IFLA_CAIF_HSI_AGGREGATION_TOUT,
|
cfhsi->cfg.aggregation_timeout) ||
|
nla_put_u32(skb, __IFLA_CAIF_HSI_HEAD_ALIGN,
|
cfhsi->cfg.head_align) ||
|
nla_put_u32(skb, __IFLA_CAIF_HSI_TAIL_ALIGN,
|
cfhsi->cfg.tail_align) ||
|
nla_put_u32(skb, __IFLA_CAIF_HSI_QHIGH_WATERMARK,
|
cfhsi->cfg.q_high_mark) ||
|
nla_put_u32(skb, __IFLA_CAIF_HSI_QLOW_WATERMARK,
|
cfhsi->cfg.q_low_mark))
|
return -EMSGSIZE;
|
|
return 0;
|
}
|
|
static int caif_hsi_newlink(struct net *src_net, struct net_device *dev,
|
struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
struct cfhsi *cfhsi = NULL;
|
struct cfhsi_ops *(*get_ops)(void);
|
|
ASSERT_RTNL();
|
|
cfhsi = netdev_priv(dev);
|
cfhsi_netlink_parms(data, cfhsi);
|
|
get_ops = symbol_get(cfhsi_get_ops);
|
if (!get_ops) {
|
pr_err("%s: failed to get the cfhsi_ops\n", __func__);
|
return -ENODEV;
|
}
|
|
/* Assign the HSI device. */
|
cfhsi->ops = (*get_ops)();
|
if (!cfhsi->ops) {
|
pr_err("%s: failed to get the cfhsi_ops\n", __func__);
|
goto err;
|
}
|
|
/* Assign the driver to this HSI device. */
|
cfhsi->ops->cb_ops = &cfhsi->cb_ops;
|
if (register_netdevice(dev)) {
|
pr_warn("%s: caif_hsi device registration failed\n", __func__);
|
goto err;
|
}
|
/* Add CAIF HSI device to list. */
|
list_add_tail(&cfhsi->list, &cfhsi_list);
|
|
return 0;
|
err:
|
symbol_put(cfhsi_get_ops);
|
return -ENODEV;
|
}
|
|
static struct rtnl_link_ops caif_hsi_link_ops __read_mostly = {
|
.kind = "cfhsi",
|
.priv_size = sizeof(struct cfhsi),
|
.setup = cfhsi_setup,
|
.maxtype = __IFLA_CAIF_HSI_MAX,
|
.policy = caif_hsi_policy,
|
.newlink = caif_hsi_newlink,
|
.changelink = caif_hsi_changelink,
|
.get_size = caif_hsi_get_size,
|
.fill_info = caif_hsi_fill_info,
|
};
|
|
static void __exit cfhsi_exit_module(void)
|
{
|
struct list_head *list_node;
|
struct list_head *n;
|
struct cfhsi *cfhsi;
|
|
rtnl_link_unregister(&caif_hsi_link_ops);
|
|
rtnl_lock();
|
list_for_each_safe(list_node, n, &cfhsi_list) {
|
cfhsi = list_entry(list_node, struct cfhsi, list);
|
unregister_netdevice(cfhsi->ndev);
|
}
|
rtnl_unlock();
|
}
|
|
static int __init cfhsi_init_module(void)
|
{
|
return rtnl_link_register(&caif_hsi_link_ops);
|
}
|
|
module_init(cfhsi_init_module);
|
module_exit(cfhsi_exit_module);
|
