mirror of https://gitee.com/openkylin/linux.git
caif-hsi: robust frame aggregation for HSI
Implement aggregation algorithm, combining more data into a single HSI transfer. 4 different traffic categories are supported: 1. TC_PRIO_CONTROL .. TC_PRIO_MAX (CTL) 2. TC_PRIO_INTERACTIVE (VO) 3. TC_PRIO_INTERACTIVE_BULK (VI) 4. TC_PRIO_BESTEFFORT, TC_PRIO_BULK, TC_PRIO_FILLER (BEBK) Signed-off-by: Dmitry Tarnyagin <dmitry.tarnyagin@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Tarnyagin
David S. Miller
parent
447648128e
commit
ece367d53a
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@ -19,6 +19,7 @@
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/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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@ -34,6 +35,10 @@ static int inactivity_timeout = 1000;
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module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms.");
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static int aggregation_timeout = 1;
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module_param(aggregation_timeout, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(aggregation_timeout, "Aggregation timeout on HSI, ms.");
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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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@ -86,24 +91,84 @@ static void cfhsi_inactivity_tout(unsigned long arg)
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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), hsi_head_align);
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tpad = PAD_POW2((skb->len + hpad), hsi_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->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 = skb_dequeue(&cfhsi->qhead);
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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->timer,
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mod_timer(&cfhsi->inactivity_timer,
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jiffies + cfhsi->inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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}
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@ -169,7 +234,7 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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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 = skb_dequeue(&cfhsi->qhead);
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skb = cfhsi_dequeue(cfhsi);
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if (!skb)
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return 0;
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@ -196,11 +261,16 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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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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@ -214,7 +284,7 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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int tpad = 0;
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if (!skb)
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skb = skb_dequeue(&cfhsi->qhead);
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skb = cfhsi_dequeue(cfhsi);
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if (!skb)
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break;
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@ -233,8 +303,11 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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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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@ -244,6 +317,8 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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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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@ -258,8 +333,7 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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}
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/* Check if we can piggy-back another descriptor. */
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skb = skb_peek(&cfhsi->qhead);
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if (skb)
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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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@ -267,61 +341,71 @@ static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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return CFHSI_DESC_SZ + pld_len;
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}
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static void cfhsi_tx_done(struct cfhsi *cfhsi)
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static void cfhsi_start_tx(struct cfhsi *cfhsi)
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{
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struct cfhsi_desc *desc = NULL;
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int len = 0;
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int res;
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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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dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
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if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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return;
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desc = (struct cfhsi_desc *)cfhsi->tx_buf;
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do {
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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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*/
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spin_lock_bh(&cfhsi->lock);
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if (cfhsi->flow_off_sent &&
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cfhsi->qhead.qlen <= cfhsi->q_low_mark &&
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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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spin_unlock_bh(&cfhsi->lock);
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/* Create HSI frame. */
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do {
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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(skb_peek(&cfhsi->qhead))) {
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spin_unlock_bh(&cfhsi->lock);
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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->timer,
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jiffies + cfhsi->inactivity_timeout);
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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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goto done;
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res = -EAGAIN;
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continue;
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}
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} while (!len);
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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->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->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
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if (WARN_ON(res < 0)) {
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if (WARN_ON(res < 0))
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dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
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__func__, res);
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}
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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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dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
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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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*/
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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->q_low_mark &&
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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->aggregation_timeout);
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spin_unlock_bh(&cfhsi->lock);
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}
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done:
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return;
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}
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@ -560,7 +644,7 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
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/* Update inactivity timer if pending. */
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spin_lock_bh(&cfhsi->lock);
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mod_timer_pending(&cfhsi->timer,
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mod_timer_pending(&cfhsi->inactivity_timer,
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jiffies + cfhsi->inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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@ -793,12 +877,12 @@ static void cfhsi_wake_up(struct work_struct *work)
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spin_lock_bh(&cfhsi->lock);
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/* Resume transmit if queue is not empty. */
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if (!skb_peek(&cfhsi->qhead)) {
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/* Resume transmit if queues are not empty. */
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if (!cfhsi_tx_queue_len(cfhsi)) {
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dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n",
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__func__);
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/* Start inactivity timer. */
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mod_timer(&cfhsi->timer,
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mod_timer(&cfhsi->inactivity_timer,
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jiffies + cfhsi->inactivity_timeout);
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spin_unlock_bh(&cfhsi->lock);
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return;
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@ -934,20 +1018,53 @@ static void cfhsi_wake_down_cb(struct cfhsi_drv *drv)
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wake_up_interruptible(&cfhsi->wake_down_wait);
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}
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static void cfhsi_aggregation_tout(unsigned long arg)
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{
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struct cfhsi *cfhsi = (struct cfhsi *)arg;
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dev_dbg(&cfhsi->ndev->dev, "%s.\n",
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__func__);
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cfhsi_start_tx(cfhsi);
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}
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static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct cfhsi *cfhsi = NULL;
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int start_xfer = 0;
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int timer_active;
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int prio;
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if (!dev)
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return -EINVAL;
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cfhsi = netdev_priv(dev);
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switch (skb->priority) {
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case TC_PRIO_BESTEFFORT:
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case TC_PRIO_FILLER:
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case TC_PRIO_BULK:
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prio = CFHSI_PRIO_BEBK;
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break;
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case TC_PRIO_INTERACTIVE_BULK:
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prio = CFHSI_PRIO_VI;
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break;
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case TC_PRIO_INTERACTIVE:
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prio = CFHSI_PRIO_VO;
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break;
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case TC_PRIO_CONTROL:
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default:
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prio = CFHSI_PRIO_CTL;
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break;
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}
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spin_lock_bh(&cfhsi->lock);
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skb_queue_tail(&cfhsi->qhead, skb);
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/* Update aggregation statistics */
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cfhsi_update_aggregation_stats(cfhsi, skb, 1);
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/* Queue the SKB */
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skb_queue_tail(&cfhsi->qhead[prio], skb);
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/* Sanity check; xmit should not be called after unregister_netdev */
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if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
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@ -958,7 +1075,7 @@ static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
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/* Send flow off if number of packets is above high water mark. */
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if (!cfhsi->flow_off_sent &&
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cfhsi->qhead.qlen > cfhsi->q_high_mark &&
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cfhsi_tx_queue_len(cfhsi) > cfhsi->q_high_mark &&
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cfhsi->cfdev.flowctrl) {
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cfhsi->flow_off_sent = 1;
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cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
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@ -970,12 +1087,18 @@ static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
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}
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if (!start_xfer) {
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/* Send aggregate if it is possible */
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bool aggregate_ready =
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cfhsi_can_send_aggregate(cfhsi) &&
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del_timer(&cfhsi->aggregation_timer) > 0;
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spin_unlock_bh(&cfhsi->lock);
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if (aggregate_ready)
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cfhsi_start_tx(cfhsi);
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return 0;
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}
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/* Delete inactivity timer if started. */
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timer_active = del_timer_sync(&cfhsi->timer);
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timer_active = del_timer_sync(&cfhsi->inactivity_timer);
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spin_unlock_bh(&cfhsi->lock);
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@ -1026,6 +1149,7 @@ static const struct net_device_ops cfhsi_ops = {
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static void cfhsi_setup(struct net_device *dev)
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{
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int i;
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struct cfhsi *cfhsi = netdev_priv(dev);
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dev->features = 0;
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dev->netdev_ops = &cfhsi_ops;
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@ -1034,7 +1158,8 @@ static void cfhsi_setup(struct net_device *dev)
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dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
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dev->tx_queue_len = 0;
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dev->destructor = free_netdev;
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skb_queue_head_init(&cfhsi->qhead);
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for (i = 0; i < CFHSI_PRIO_LAST; ++i)
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skb_queue_head_init(&cfhsi->qhead[i]);
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cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
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cfhsi->cfdev.use_frag = false;
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cfhsi->cfdev.use_stx = false;
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@ -1111,6 +1236,9 @@ int cfhsi_probe(struct platform_device *pdev)
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cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
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}
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/* Initialize aggregation timeout */
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cfhsi->aggregation_timeout = aggregation_timeout;
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/* Initialize recieve vaiables. */
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cfhsi->rx_ptr = cfhsi->rx_buf;
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cfhsi->rx_len = CFHSI_DESC_SZ;
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@ -1150,13 +1278,17 @@ int cfhsi_probe(struct platform_device *pdev)
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init_waitqueue_head(&cfhsi->flush_fifo_wait);
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/* Setup the inactivity timer. */
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init_timer(&cfhsi->timer);
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cfhsi->timer.data = (unsigned long)cfhsi;
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||||
cfhsi->timer.function = cfhsi_inactivity_tout;
|
||||
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;
|
||||
|
||||
/* Add CAIF HSI device to list. */
|
||||
spin_lock(&cfhsi_list_lock);
|
||||
|
|
@ -1222,8 +1354,9 @@ static void cfhsi_shutdown(struct cfhsi *cfhsi)
|
|||
flush_workqueue(cfhsi->wq);
|
||||
|
||||
/* Delete timers if pending */
|
||||
del_timer_sync(&cfhsi->timer);
|
||||
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->dev->cfhsi_rx_cancel(cfhsi->dev);
|
||||
|
|
|
|||
|
|
@ -123,12 +123,21 @@ struct cfhsi_rx_state {
|
|||
bool piggy_desc;
|
||||
};
|
||||
|
||||
/* Priority mapping */
|
||||
enum {
|
||||
CFHSI_PRIO_CTL = 0,
|
||||
CFHSI_PRIO_VI,
|
||||
CFHSI_PRIO_VO,
|
||||
CFHSI_PRIO_BEBK,
|
||||
CFHSI_PRIO_LAST,
|
||||
};
|
||||
|
||||
/* Structure implemented by CAIF HSI drivers. */
|
||||
struct cfhsi {
|
||||
struct caif_dev_common cfdev;
|
||||
struct net_device *ndev;
|
||||
struct platform_device *pdev;
|
||||
struct sk_buff_head qhead;
|
||||
struct sk_buff_head qhead[CFHSI_PRIO_LAST];
|
||||
struct cfhsi_drv drv;
|
||||
struct cfhsi_dev *dev;
|
||||
int tx_state;
|
||||
|
|
@ -151,8 +160,14 @@ struct cfhsi {
|
|||
wait_queue_head_t wake_up_wait;
|
||||
wait_queue_head_t wake_down_wait;
|
||||
wait_queue_head_t flush_fifo_wait;
|
||||
struct timer_list timer;
|
||||
struct timer_list inactivity_timer;
|
||||
struct timer_list rx_slowpath_timer;
|
||||
|
||||
/* TX aggregation */
|
||||
unsigned long aggregation_timeout;
|
||||
int aggregation_len;
|
||||
struct timer_list aggregation_timer;
|
||||
|
||||
unsigned long bits;
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue