Staging: Octeon Ethernet: Rewrite transmit code.
Stop the queue if too many packets are queued. Restart it from a high resolution timer. Rearrange and simplify locking and SKB freeing code Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org To: gregkh@suse.de Patchwork: http://patchwork.linux-mips.org/patch/843/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
Ralf Baechle
Родитель
166bdaa9aa
Коммит
6888fc8776
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@ -3,6 +3,7 @@ config OCTEON_ETHERNET
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depends on CPU_CAVIUM_OCTEON
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select PHYLIB
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select MDIO_OCTEON
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select HIGH_RES_TIMERS
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help
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This driver supports the builtin ethernet ports on Cavium
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Networks' products in the Octeon family. This driver supports the
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@ -64,6 +64,49 @@
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#define GET_SKBUFF_QOS(skb) 0
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#endif
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static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
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{
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int32_t undo;
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undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
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if (undo > 0)
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cvmx_fau_atomic_add32(fau, -undo);
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skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free;
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return skb_to_free;
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}
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void cvm_oct_free_tx_skbs(struct octeon_ethernet *priv)
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{
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int32_t skb_to_free;
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int qos, queues_per_port;
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queues_per_port = cvmx_pko_get_num_queues(priv->port);
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/* Drain any pending packets in the free list */
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for (qos = 0; qos < queues_per_port; qos++) {
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if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
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continue;
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skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE);
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skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
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while (skb_to_free > 0) {
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dev_kfree_skb_any(skb_dequeue(&priv->tx_free_list[qos]));
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skb_to_free--;
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}
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}
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}
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enum hrtimer_restart cvm_oct_restart_tx(struct hrtimer *timer)
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{
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struct octeon_ethernet *priv = container_of(timer, struct octeon_ethernet, tx_restart_timer);
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struct net_device *dev = cvm_oct_device[priv->port];
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cvm_oct_free_tx_skbs(priv);
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if (netif_queue_stopped(dev))
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netif_wake_queue(dev);
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return HRTIMER_NORESTART;
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}
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/**
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* Packet transmit
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*
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@ -77,13 +120,13 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
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union cvmx_buf_ptr hw_buffer;
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uint64_t old_scratch;
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uint64_t old_scratch2;
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int dropped;
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int qos;
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int queue_it_up;
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enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
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struct octeon_ethernet *priv = netdev_priv(dev);
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struct sk_buff *to_free_list;
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int32_t skb_to_free;
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int32_t undo;
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int32_t buffers_to_free;
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unsigned long flags;
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#if REUSE_SKBUFFS_WITHOUT_FREE
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unsigned char *fpa_head;
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#endif
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@ -94,9 +137,6 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
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*/
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prefetch(priv);
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/* Start off assuming no drop */
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dropped = 0;
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/*
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* The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
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* completely remove "qos" in the event neither interface
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@ -268,9 +308,9 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
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skb->tc_verd = 0;
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#endif /* CONFIG_NET_CLS_ACT */
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#endif /* CONFIG_NET_SCHED */
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#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
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dont_put_skbuff_in_hw:
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#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
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/* Check if we can use the hardware checksumming */
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if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
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@ -295,18 +335,7 @@ dont_put_skbuff_in_hw:
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cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
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}
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/*
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* We try to claim MAX_SKB_TO_FREE buffers. If there were not
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* that many available, we have to un-claim (undo) any that
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* were in excess. If skb_to_free is positive we will free
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* that many buffers.
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*/
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undo = skb_to_free > 0 ?
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MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
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if (undo > 0)
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cvmx_fau_atomic_add32(priv->fau+qos*4, -undo);
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skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ?
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MAX_SKB_TO_FREE : -skb_to_free;
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skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
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/*
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* If we're sending faster than the receive can free them then
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@ -317,24 +346,74 @@ dont_put_skbuff_in_hw:
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pko_command.s.reg0 = priv->fau + qos * 4;
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}
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cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
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CVMX_PKO_LOCK_CMD_QUEUE);
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if (pko_command.s.dontfree)
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queue_type = QUEUE_CORE;
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else
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queue_type = QUEUE_HW;
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spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
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/* Drop this packet if we have too many already queued to the HW */
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if (unlikely
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(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
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/*
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DEBUGPRINT("%s: Tx dropped. Too many queued\n", dev->name);
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*/
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dropped = 1;
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if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
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if (dev->tx_queue_len != 0) {
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/* Drop the lock when notifying the core. */
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spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
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netif_stop_queue(dev);
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hrtimer_start(&priv->tx_restart_timer,
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priv->tx_restart_interval, HRTIMER_MODE_REL);
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spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
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} else {
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/* If not using normal queueing. */
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queue_type = QUEUE_DROP;
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goto skip_xmit;
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}
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}
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cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
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CVMX_PKO_LOCK_NONE);
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/* Send the packet to the output queue */
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else if (unlikely
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(cvmx_pko_send_packet_finish
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(priv->port, priv->queue + qos, pko_command, hw_buffer,
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CVMX_PKO_LOCK_CMD_QUEUE))) {
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if (unlikely(cvmx_pko_send_packet_finish(priv->port,
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priv->queue + qos,
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pko_command, hw_buffer,
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CVMX_PKO_LOCK_NONE))) {
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DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
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dropped = 1;
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queue_type = QUEUE_DROP;
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}
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skip_xmit:
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to_free_list = NULL;
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switch (queue_type) {
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case QUEUE_DROP:
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skb->next = to_free_list;
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to_free_list = skb;
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priv->stats.tx_dropped++;
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break;
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case QUEUE_HW:
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cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
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break;
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case QUEUE_CORE:
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__skb_queue_tail(&priv->tx_free_list[qos], skb);
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break;
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default:
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BUG();
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}
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while (skb_to_free > 0) {
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struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
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t->next = to_free_list;
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to_free_list = t;
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skb_to_free--;
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}
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spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
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/* Do the actual freeing outside of the lock. */
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while (to_free_list) {
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struct sk_buff *t = to_free_list;
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to_free_list = to_free_list->next;
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dev_kfree_skb_any(t);
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}
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if (USE_ASYNC_IOBDMA) {
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@ -343,34 +422,7 @@ dont_put_skbuff_in_hw:
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cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
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}
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queue_it_up = 0;
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if (unlikely(dropped)) {
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dev_kfree_skb_any(skb);
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priv->stats.tx_dropped++;
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} else {
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if (USE_SKBUFFS_IN_HW) {
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/* Put this packet on the queue to be freed later */
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if (pko_command.s.dontfree)
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queue_it_up = 1;
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else
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cvmx_fau_atomic_add32
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(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
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} else {
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/* Put this packet on the queue to be freed later */
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queue_it_up = 1;
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}
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}
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if (queue_it_up) {
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spin_lock(&priv->tx_free_list[qos].lock);
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__skb_queue_tail(&priv->tx_free_list[qos], skb);
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cvm_oct_free_tx_skbs(priv, skb_to_free, qos, 0);
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spin_unlock(&priv->tx_free_list[qos].lock);
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} else {
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cvm_oct_free_tx_skbs(priv, skb_to_free, qos, 1);
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}
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return 0;
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return NETDEV_TX_OK;
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}
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/**
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@ -30,28 +30,5 @@ int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev);
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int cvm_oct_transmit_qos(struct net_device *dev, void *work_queue_entry,
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int do_free, int qos);
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void cvm_oct_tx_shutdown(struct net_device *dev);
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/**
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* Free dead transmit skbs.
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*
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* @priv: The driver data
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* @skb_to_free: The number of SKBs to free (free none if negative).
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* @qos: The queue to free from.
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* @take_lock: If true, acquire the skb list lock.
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*/
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static inline void cvm_oct_free_tx_skbs(struct octeon_ethernet *priv,
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int skb_to_free,
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int qos, int take_lock)
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{
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/* Free skbuffs not in use by the hardware. */
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if (skb_to_free > 0) {
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if (take_lock)
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spin_lock(&priv->tx_free_list[qos].lock);
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while (skb_to_free > 0) {
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dev_kfree_skb(__skb_dequeue(&priv->tx_free_list[qos]));
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skb_to_free--;
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}
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if (take_lock)
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spin_unlock(&priv->tx_free_list[qos].lock);
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}
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}
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void cvm_oct_free_tx_skbs(struct octeon_ethernet *priv);
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enum hrtimer_restart cvm_oct_restart_tx(struct hrtimer *timer);
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@ -131,50 +131,29 @@ struct net_device *cvm_oct_device[TOTAL_NUMBER_OF_PORTS];
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*/
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static void cvm_do_timer(unsigned long arg)
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{
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int32_t skb_to_free, undo;
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int queues_per_port;
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int qos;
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struct octeon_ethernet *priv;
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static int port;
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if (port >= CVMX_PIP_NUM_INPUT_PORTS) {
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if (port < CVMX_PIP_NUM_INPUT_PORTS) {
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if (cvm_oct_device[port]) {
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struct octeon_ethernet *priv = netdev_priv(cvm_oct_device[port]);
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if (priv->poll)
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priv->poll(cvm_oct_device[port]);
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cvm_oct_free_tx_skbs(priv);
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cvm_oct_device[port]->netdev_ops->ndo_get_stats(cvm_oct_device[port]);
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}
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port++;
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/*
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* All ports have been polled. Start the next
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* iteration through the ports in one second.
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* Poll the next port in a 50th of a second. This
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* spreads the polling of ports out a little bit.
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*/
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mod_timer(&cvm_oct_poll_timer, jiffies + HZ/50);
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} else {
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port = 0;
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/*
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* All ports have been polled. Start the next iteration through
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* the ports in one second.
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*/
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mod_timer(&cvm_oct_poll_timer, jiffies + HZ);
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return;
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}
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if (!cvm_oct_device[port])
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goto out;
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priv = netdev_priv(cvm_oct_device[port]);
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if (priv->poll)
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priv->poll(cvm_oct_device[port]);
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queues_per_port = cvmx_pko_get_num_queues(port);
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/* Drain any pending packets in the free list */
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for (qos = 0; qos < queues_per_port; qos++) {
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if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
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continue;
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skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
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MAX_SKB_TO_FREE);
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undo = skb_to_free > 0 ?
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MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
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if (undo > 0)
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cvmx_fau_atomic_add32(priv->fau+qos*4, -undo);
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skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ?
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MAX_SKB_TO_FREE : -skb_to_free;
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cvm_oct_free_tx_skbs(priv, skb_to_free, qos, 1);
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}
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cvm_oct_device[port]->netdev_ops->ndo_get_stats(cvm_oct_device[port]);
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out:
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port++;
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/* Poll the next port in a 50th of a second.
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This spreads the polling of ports out a little bit */
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mod_timer(&cvm_oct_poll_timer, jiffies + HZ / 50);
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}
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/**
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@ -678,6 +657,18 @@ static int __init cvm_oct_init_module(void)
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/* Initialize the device private structure. */
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struct octeon_ethernet *priv = netdev_priv(dev);
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hrtimer_init(&priv->tx_restart_timer,
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CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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priv->tx_restart_timer.function = cvm_oct_restart_tx;
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/*
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* Default for 10GE 5000nS enough time to
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* transmit about 100 64byte packtes. 1GE
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* interfaces will get 50000nS below.
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*/
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priv->tx_restart_interval = ktime_set(0, 5000);
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dev->netdev_ops = &cvm_oct_pow_netdev_ops;
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priv->imode = CVMX_HELPER_INTERFACE_MODE_DISABLED;
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priv->port = CVMX_PIP_NUM_INPUT_PORTS;
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@ -757,6 +748,7 @@ static int __init cvm_oct_init_module(void)
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case CVMX_HELPER_INTERFACE_MODE_SGMII:
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dev->netdev_ops = &cvm_oct_sgmii_netdev_ops;
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priv->tx_restart_interval = ktime_set(0, 50000);
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strcpy(dev->name, "eth%d");
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break;
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@ -768,6 +760,7 @@ static int __init cvm_oct_init_module(void)
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case CVMX_HELPER_INTERFACE_MODE_RGMII:
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case CVMX_HELPER_INTERFACE_MODE_GMII:
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dev->netdev_ops = &cvm_oct_rgmii_netdev_ops;
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priv->tx_restart_interval = ktime_set(0, 50000);
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strcpy(dev->name, "eth%d");
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break;
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}
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@ -31,6 +31,8 @@
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#ifndef OCTEON_ETHERNET_H
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#define OCTEON_ETHERNET_H
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#include <linux/hrtimer.h>
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/**
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* This is the definition of the Ethernet driver's private
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* driver state stored in netdev_priv(dev).
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@ -57,6 +59,8 @@ struct octeon_ethernet {
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uint64_t link_info;
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/* Called periodically to check link status */
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void (*poll) (struct net_device *dev);
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struct hrtimer tx_restart_timer;
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ktime_t tx_restart_interval;
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};
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/**
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