sky2: dynamic size transmit ring
Allocate and size transmit ring based on parameters. Saves excess space and allows configuring larger rings for testing. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
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c119731d66
commit
ee5f68fea2
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@ -64,10 +64,12 @@
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#define RX_MAX_PENDING (RX_LE_SIZE/6 - 2)
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#define RX_DEF_PENDING RX_MAX_PENDING
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#define TX_RING_SIZE 512
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#define TX_DEF_PENDING 128
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#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
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/* This is the worst case number of transmit list elements for a single skb:
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VLAN + TSO + CKSUM + Data + skb_frags * DMA */
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#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
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#define TX_MIN_PENDING (MAX_SKB_TX_LE+1)
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#define TX_MAX_PENDING 4096
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#define TX_DEF_PENDING 127
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#define STATUS_RING_SIZE 2048 /* 2 ports * (TX + 2*RX) */
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#define STATUS_LE_BYTES (STATUS_RING_SIZE*sizeof(struct sky2_status_le))
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@ -1000,7 +1002,7 @@ static inline struct sky2_tx_le *get_tx_le(struct sky2_port *sky2, u16 *slot)
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{
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struct sky2_tx_le *le = sky2->tx_le + *slot;
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*slot = RING_NEXT(*slot, TX_RING_SIZE);
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*slot = RING_NEXT(*slot, sky2->tx_ring_size);
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le->ctrl = 0;
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return le;
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}
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@ -1433,13 +1435,13 @@ static int sky2_up(struct net_device *dev)
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/* must be power of 2 */
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sky2->tx_le = pci_alloc_consistent(hw->pdev,
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TX_RING_SIZE *
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sky2->tx_ring_size *
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sizeof(struct sky2_tx_le),
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&sky2->tx_le_map);
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if (!sky2->tx_le)
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goto err_out;
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sky2->tx_ring = kcalloc(TX_RING_SIZE, sizeof(struct tx_ring_info),
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sky2->tx_ring = kcalloc(sky2->tx_ring_size, sizeof(struct tx_ring_info),
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GFP_KERNEL);
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if (!sky2->tx_ring)
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goto err_out;
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@ -1491,7 +1493,7 @@ static int sky2_up(struct net_device *dev)
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sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), ECU_TXFF_LEV);
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sky2_prefetch_init(hw, txqaddr[port], sky2->tx_le_map,
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TX_RING_SIZE - 1);
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sky2->tx_ring_size - 1);
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#ifdef SKY2_VLAN_TAG_USED
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sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);
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@ -1520,7 +1522,7 @@ err_out:
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}
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if (sky2->tx_le) {
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pci_free_consistent(hw->pdev,
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TX_RING_SIZE * sizeof(struct sky2_tx_le),
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sky2->tx_ring_size * sizeof(struct sky2_tx_le),
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sky2->tx_le, sky2->tx_le_map);
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sky2->tx_le = NULL;
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}
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@ -1533,15 +1535,15 @@ err_out:
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}
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/* Modular subtraction in ring */
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static inline int tx_dist(unsigned tail, unsigned head)
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static inline int tx_inuse(const struct sky2_port *sky2)
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{
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return (head - tail) & (TX_RING_SIZE - 1);
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return (sky2->tx_prod - sky2->tx_cons) & (sky2->tx_ring_size - 1);
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}
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/* Number of list elements available for next tx */
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static inline int tx_avail(const struct sky2_port *sky2)
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{
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return sky2->tx_pending - tx_dist(sky2->tx_cons, sky2->tx_prod);
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return sky2->tx_pending - tx_inuse(sky2);
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}
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/* Estimate of number of transmit list elements required */
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@ -1717,7 +1719,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
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return NETDEV_TX_OK;
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mapping_unwind:
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for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, TX_RING_SIZE)) {
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for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, sky2->tx_ring_size)) {
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le = sky2->tx_le + i;
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re = sky2->tx_ring + i;
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@ -1760,10 +1762,10 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
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struct pci_dev *pdev = sky2->hw->pdev;
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unsigned idx;
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BUG_ON(done >= TX_RING_SIZE);
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BUG_ON(done >= sky2->tx_ring_size);
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for (idx = sky2->tx_cons; idx != done;
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idx = RING_NEXT(idx, TX_RING_SIZE)) {
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idx = RING_NEXT(idx, sky2->tx_ring_size)) {
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struct sky2_tx_le *le = sky2->tx_le + idx;
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struct tx_ring_info *re = sky2->tx_ring + idx;
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@ -1799,7 +1801,7 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
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else
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dev_kfree_skb_any(skb);
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sky2->tx_next = RING_NEXT(idx, TX_RING_SIZE);
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sky2->tx_next = RING_NEXT(idx, sky2->tx_ring_size);
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}
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}
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@ -1907,7 +1909,7 @@ static int sky2_down(struct net_device *dev)
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kfree(sky2->rx_ring);
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pci_free_consistent(hw->pdev,
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TX_RING_SIZE * sizeof(struct sky2_tx_le),
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sky2->tx_ring_size * sizeof(struct sky2_tx_le),
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sky2->tx_le, sky2->tx_le_map);
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kfree(sky2->tx_ring);
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@ -2517,7 +2519,6 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
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case OP_TXINDEXLE:
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/* TX index reports status for both ports */
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BUILD_BUG_ON(TX_RING_SIZE > 0x1000);
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sky2_tx_done(hw->dev[0], status & 0xfff);
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if (hw->dev[1])
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sky2_tx_done(hw->dev[1],
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@ -3669,7 +3670,7 @@ static int sky2_set_coalesce(struct net_device *dev,
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ecmd->rx_coalesce_usecs_irq > tmax)
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return -EINVAL;
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if (ecmd->tx_max_coalesced_frames >= TX_RING_SIZE-1)
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if (ecmd->tx_max_coalesced_frames >= sky2->tx_ring_size-1)
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return -EINVAL;
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if (ecmd->rx_max_coalesced_frames > RX_MAX_PENDING)
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return -EINVAL;
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@ -3713,7 +3714,7 @@ static void sky2_get_ringparam(struct net_device *dev,
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ering->rx_max_pending = RX_MAX_PENDING;
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ering->rx_mini_max_pending = 0;
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ering->rx_jumbo_max_pending = 0;
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ering->tx_max_pending = TX_RING_SIZE - 1;
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ering->tx_max_pending = TX_MAX_PENDING;
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ering->rx_pending = sky2->rx_pending;
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ering->rx_mini_pending = 0;
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@ -3728,14 +3729,15 @@ static int sky2_set_ringparam(struct net_device *dev,
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if (ering->rx_pending > RX_MAX_PENDING ||
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ering->rx_pending < 8 ||
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ering->tx_pending < MAX_SKB_TX_LE ||
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ering->tx_pending > TX_RING_SIZE - 1)
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ering->tx_pending < TX_MIN_PENDING ||
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ering->tx_pending > TX_MAX_PENDING)
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return -EINVAL;
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sky2_detach(dev);
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sky2->rx_pending = ering->rx_pending;
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sky2->tx_pending = ering->tx_pending;
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sky2->tx_ring_size = roundup_pow_of_two(sky2->tx_pending+1);
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return sky2_reattach(dev);
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}
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@ -4105,8 +4107,8 @@ static int sky2_debug_show(struct seq_file *seq, void *v)
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/* Dump contents of tx ring */
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sop = 1;
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for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < TX_RING_SIZE;
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idx = RING_NEXT(idx, TX_RING_SIZE)) {
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for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < sky2->tx_ring_size;
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idx = RING_NEXT(idx, sky2->tx_ring_size)) {
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const struct sky2_tx_le *le = sky2->tx_le + idx;
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u32 a = le32_to_cpu(le->addr);
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@ -4315,7 +4317,9 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
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sky2->wol = wol;
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spin_lock_init(&sky2->phy_lock);
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sky2->tx_pending = TX_DEF_PENDING;
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sky2->tx_ring_size = roundup_pow_of_two(TX_DEF_PENDING+1);
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sky2->rx_pending = RX_DEF_PENDING;
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hw->dev[port] = dev;
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@ -2011,6 +2011,7 @@ struct sky2_port {
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struct tx_ring_info *tx_ring;
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struct sky2_tx_le *tx_le;
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u16 tx_ring_size;
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u16 tx_cons; /* next le to check */
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u16 tx_prod; /* next le to use */
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u16 tx_next; /* debug only */
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