--- /dev/null
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author: Daniel Martensson
+ * Dmitry.Tarnyagin / dmitry.tarnyagin@lockless.no
+ * License terms: GNU General Public License (GPL) version 2.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/if_arp.h>
+#include <linux/timer.h>
+#include <net/rtnetlink.h>
+#include <linux/pkt_sched.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/caif_hsi.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Martensson");
+MODULE_DESCRIPTION("CAIF HSI driver");
+
+/* Returns the number of padding bytes for alignment. */
+#define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
+ (((pow)-((x)&((pow)-1)))))
+
+static const struct cfhsi_config hsi_default_config = {
+
+ /* Inactivity timeout on HSI, ms */
+ .inactivity_timeout = HZ,
+
+ /* Aggregation timeout (ms) of zero means no aggregation is done*/
+ .aggregation_timeout = 1,
+
+ /*
+ * HSI link layer flow-control thresholds.
+ * Threshold values for the HSI packet queue. Flow-control will be
+ * asserted when the number of packets exceeds q_high_mark. It will
+ * not be de-asserted before the number of packets drops below
+ * q_low_mark.
+ * Warning: A high threshold value might increase throughput but it
+ * will at the same time prevent channel prioritization and increase
+ * the risk of flooding the modem. The high threshold should be above
+ * the low.
+ */
+ .q_high_mark = 100,
+ .q_low_mark = 50,
+
+ /*
+ * HSI padding options.
+ * Warning: must be a base of 2 (& operation used) and can not be zero !
+ */
+ .head_align = 4,
+ .tail_align = 4,
+};
+
+#define ON 1
+#define OFF 0
+
+static LIST_HEAD(cfhsi_list);
+
+static void cfhsi_inactivity_tout(unsigned long arg)
+{
+ struct cfhsi *cfhsi = (struct cfhsi *)arg;
+
+ netdev_dbg(cfhsi->ndev, "%s.\n",
+ __func__);
+
+ /* Schedule power down work queue. */
+ if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ queue_work(cfhsi->wq, &cfhsi->wake_down_work);
+}
+
+static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi,
+ const struct sk_buff *skb,
+ int direction)
+{
+ struct caif_payload_info *info;
+ int hpad, tpad, len;
+
+ info = (struct caif_payload_info *)&skb->cb;
+ hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
+ tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
+ len = skb->len + hpad + tpad;
+
+ if (direction > 0)
+ cfhsi->aggregation_len += len;
+ else if (direction < 0)
+ cfhsi->aggregation_len -= len;
+}
+
+static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
+{
+ int i;
+
+ if (cfhsi->cfg.aggregation_timeout == 0)
+ return true;
+
+ for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {
+ if (cfhsi->qhead[i].qlen)
+ return true;
+ }
+
+ /* TODO: Use aggregation_len instead */
+ if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS)
+ return true;
+
+ return false;
+}
+
+static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi)
+{
+ struct sk_buff *skb;
+ int i;
+
+ for (i = 0; i < CFHSI_PRIO_LAST; ++i) {
+ skb = skb_dequeue(&cfhsi->qhead[i]);
+ if (skb)
+ break;
+ }
+
+ return skb;
+}
+
+static int cfhsi_tx_queue_len(struct cfhsi *cfhsi)
+{
+ int i, len = 0;
+ for (i = 0; i < CFHSI_PRIO_LAST; ++i)
+ len += skb_queue_len(&cfhsi->qhead[i]);
+ return len;
+}
+
+static void cfhsi_abort_tx(struct cfhsi *cfhsi)
+{
+ struct sk_buff *skb;
+
+ for (;;) {
+ spin_lock_bh(&cfhsi->lock);
+ skb = cfhsi_dequeue(cfhsi);
+ if (!skb)
+ break;
+
+ cfhsi->ndev->stats.tx_errors++;
+ cfhsi->ndev->stats.tx_dropped++;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
+ spin_unlock_bh(&cfhsi->lock);
+ kfree_skb(skb);
+ }
+ cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
+ if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ mod_timer(&cfhsi->inactivity_timer,
+ jiffies + cfhsi->cfg.inactivity_timeout);
+ spin_unlock_bh(&cfhsi->lock);
+}
+
+static int cfhsi_flush_fifo(struct cfhsi *cfhsi)
+{
+ char buffer[32]; /* Any reasonable value */
+ size_t fifo_occupancy;
+ int ret;
+
+ netdev_dbg(cfhsi->ndev, "%s.\n",
+ __func__);
+
+ do {
+ ret = cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
+ &fifo_occupancy);
+ if (ret) {
+ netdev_warn(cfhsi->ndev,
+ "%s: can't get FIFO occupancy: %d.\n",
+ __func__, ret);
+ break;
+ } else if (!fifo_occupancy)
+ /* No more data, exitting normally */
+ break;
+
+ fifo_occupancy = min(sizeof(buffer), fifo_occupancy);
+ set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
+ ret = cfhsi->ops->cfhsi_rx(buffer, fifo_occupancy,
+ cfhsi->ops);
+ if (ret) {
+ clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
+ netdev_warn(cfhsi->ndev,
+ "%s: can't read data: %d.\n",
+ __func__, ret);
+ break;
+ }
+
+ ret = 5 * HZ;
+ ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait,
+ !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret);
+
+ if (ret < 0) {
+ netdev_warn(cfhsi->ndev,
+ "%s: can't wait for flush complete: %d.\n",
+ __func__, ret);
+ break;
+ } else if (!ret) {
+ ret = -ETIMEDOUT;
+ netdev_warn(cfhsi->ndev,
+ "%s: timeout waiting for flush complete.\n",
+ __func__);
+ break;
+ }
+ } while (1);
+
+ return ret;
+}
+
+static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
+{
+ int nfrms = 0;
+ int pld_len = 0;
+ struct sk_buff *skb;
+ u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
+
+ skb = cfhsi_dequeue(cfhsi);
+ if (!skb)
+ return 0;
+
+ /* Clear offset. */
+ desc->offset = 0;
+
+ /* Check if we can embed a CAIF frame. */
+ if (skb->len < CFHSI_MAX_EMB_FRM_SZ) {
+ struct caif_payload_info *info;
+ int hpad;
+ int tpad;
+
+ /* Calculate needed head alignment and tail alignment. */
+ info = (struct caif_payload_info *)&skb->cb;
+
+ hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
+ tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
+
+ /* Check if frame still fits with added alignment. */
+ if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) {
+ u8 *pemb = desc->emb_frm;
+ desc->offset = CFHSI_DESC_SHORT_SZ;
+ *pemb = (u8)(hpad - 1);
+ pemb += hpad;
+
+ /* Update network statistics. */
+ spin_lock_bh(&cfhsi->lock);
+ cfhsi->ndev->stats.tx_packets++;
+ cfhsi->ndev->stats.tx_bytes += skb->len;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
+ spin_unlock_bh(&cfhsi->lock);
+
+ /* Copy in embedded CAIF frame. */
+ skb_copy_bits(skb, 0, pemb, skb->len);
+
+ /* Consume the SKB */
+ consume_skb(skb);
+ skb = NULL;
+ }
+ }
+
+ /* Create payload CAIF frames. */
+ pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
+ while (nfrms < CFHSI_MAX_PKTS) {
+ struct caif_payload_info *info;
+ int hpad;
+ int tpad;
+
+ if (!skb)
+ skb = cfhsi_dequeue(cfhsi);
+
+ if (!skb)
+ break;
+
+ /* Calculate needed head alignment and tail alignment. */
+ info = (struct caif_payload_info *)&skb->cb;
+
+ hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
+ tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
+
+ /* Fill in CAIF frame length in descriptor. */
+ desc->cffrm_len[nfrms] = hpad + skb->len + tpad;
+
+ /* Fill head padding information. */
+ *pfrm = (u8)(hpad - 1);
+ pfrm += hpad;
+
+ /* Update network statistics. */
+ spin_lock_bh(&cfhsi->lock);
+ cfhsi->ndev->stats.tx_packets++;
+ cfhsi->ndev->stats.tx_bytes += skb->len;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
+ spin_unlock_bh(&cfhsi->lock);
+
+ /* Copy in CAIF frame. */
+ skb_copy_bits(skb, 0, pfrm, skb->len);
+
+ /* Update payload length. */
+ pld_len += desc->cffrm_len[nfrms];
+
+ /* Update frame pointer. */
+ pfrm += skb->len + tpad;
+
+ /* Consume the SKB */
+ consume_skb(skb);
+ skb = NULL;
+
+ /* Update number of frames. */
+ nfrms++;
+ }
+
+ /* Unused length fields should be zero-filled (according to SPEC). */
+ while (nfrms < CFHSI_MAX_PKTS) {
+ desc->cffrm_len[nfrms] = 0x0000;
+ nfrms++;
+ }
+
+ /* Check if we can piggy-back another descriptor. */
+ if (cfhsi_can_send_aggregate(cfhsi))
+ desc->header |= CFHSI_PIGGY_DESC;
+ else
+ desc->header &= ~CFHSI_PIGGY_DESC;
+
+ return CFHSI_DESC_SZ + pld_len;
+}
+
+static void cfhsi_start_tx(struct cfhsi *cfhsi)
+{
+ struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
+ int len, res;
+
+ netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
+
+ if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ return;
+
+ do {
+ /* Create HSI frame. */
+ len = cfhsi_tx_frm(desc, cfhsi);
+ if (!len) {
+ spin_lock_bh(&cfhsi->lock);
+ if (unlikely(cfhsi_tx_queue_len(cfhsi))) {
+ spin_unlock_bh(&cfhsi->lock);
+ res = -EAGAIN;
+ continue;
+ }
+ cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
+ /* Start inactivity timer. */
+ mod_timer(&cfhsi->inactivity_timer,
+ jiffies + cfhsi->cfg.inactivity_timeout);
+ spin_unlock_bh(&cfhsi->lock);
+ break;
+ }
+
+ /* 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);
+ } while (res < 0);
+}
+
+static void cfhsi_tx_done(struct cfhsi *cfhsi)
+{
+ netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
+
+ if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ return;
+
+ /*
+ * Send flow on if flow off has been previously signalled
+ * and number of packets is below low water mark.
+ */
+ spin_lock_bh(&cfhsi->lock);
+ if (cfhsi->flow_off_sent &&
+ cfhsi_tx_queue_len(cfhsi) <= cfhsi->cfg.q_low_mark &&
+ cfhsi->cfdev.flowctrl) {
+
+ cfhsi->flow_off_sent = 0;
+ cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
+ }
+
+ if (cfhsi_can_send_aggregate(cfhsi)) {
+ spin_unlock_bh(&cfhsi->lock);
+ cfhsi_start_tx(cfhsi);
+ } else {
+ mod_timer(&cfhsi->aggregation_timer,
+ jiffies + cfhsi->cfg.aggregation_timeout);
+ spin_unlock_bh(&cfhsi->lock);
+ }
+
+ return;
+}
+
+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",
+ __func__);
+
+ if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ return;
+ cfhsi_tx_done(cfhsi);
+}
+
+static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
+{
+ int xfer_sz = 0;
+ int nfrms = 0;
+ u16 *plen = NULL;
+ u8 *pfrm = NULL;
+
+ if ((desc->header & ~CFHSI_PIGGY_DESC) ||
+ (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
+ netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n",
+ __func__);
+ return -EPROTO;
+ }
+
+ /* Check for embedded CAIF frame. */
+ if (desc->offset) {
+ struct sk_buff *skb;
+ u8 *dst = NULL;
+ int len = 0;
+ pfrm = ((u8 *)desc) + desc->offset;
+
+ /* Remove offset padding. */
+ pfrm += *pfrm + 1;
+
+ /* Read length of CAIF frame (little endian). */
+ len = *pfrm;
+ len |= ((*(pfrm+1)) << 8) & 0xFF00;
+ 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);
+
+ dst = skb_put(skb, len);
+ memcpy(dst, 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 *dst = NULL;
+ 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);
+
+ dst = skb_put(skb, len);
+ memcpy(dst, 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(unsigned long arg)
+{
+ struct cfhsi *cfhsi = (struct cfhsi *)arg;
+
+ 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(unsigned long arg)
+{
+ struct cfhsi *cfhsi = (struct cfhsi *)arg;
+
+ 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->tx_queue_len = 0;
+ dev->destructor = free_netdev;
+ 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 = create_singlethread_workqueue(cfhsi->ndev->name);
+ 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. */
+ init_timer(&cfhsi->inactivity_timer);
+ cfhsi->inactivity_timer.data = (unsigned long)cfhsi;
+ cfhsi->inactivity_timer.function = cfhsi_inactivity_tout;
+ /* Setup the slowpath RX timer. */
+ init_timer(&cfhsi->rx_slowpath_timer);
+ cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi;
+ cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath;
+ /* Setup the aggregation timer. */
+ init_timer(&cfhsi->aggregation_timer);
+ cfhsi->aggregation_timer.data = (unsigned long)cfhsi;
+ cfhsi->aggregation_timer.function = cfhsi_aggregation_tout;
+
+ /* 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);
+
+ /* Flush workqueue */
+ flush_workqueue(cfhsi->wq);
+
+ /* 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[])
+{
+ 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 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_netdev(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);
Code Review / kvmfornfv.git / blobdiff