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>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 58d3521..7c1880d 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -64,10 +64,12 @@
#define RX_MAX_PENDING (RX_LE_SIZE/6 - 2)
#define RX_DEF_PENDING RX_MAX_PENDING
-#define TX_RING_SIZE 512
-#define TX_DEF_PENDING 128
-#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
+/* This is the worst case number of transmit list elements for a single skb:
+ VLAN + TSO + CKSUM + Data + skb_frags * DMA */
+#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
#define TX_MIN_PENDING (MAX_SKB_TX_LE+1)
+#define TX_MAX_PENDING 4096
+#define TX_DEF_PENDING 127
#define STATUS_RING_SIZE 2048 /* 2 ports * (TX + 2*RX) */
#define STATUS_LE_BYTES (STATUS_RING_SIZE*sizeof(struct sky2_status_le))
@@ -1000,7 +1002,7 @@
{
struct sky2_tx_le *le = sky2->tx_le + *slot;
- *slot = RING_NEXT(*slot, TX_RING_SIZE);
+ *slot = RING_NEXT(*slot, sky2->tx_ring_size);
le->ctrl = 0;
return le;
}
@@ -1433,13 +1435,13 @@
/* must be power of 2 */
sky2->tx_le = pci_alloc_consistent(hw->pdev,
- TX_RING_SIZE *
+ sky2->tx_ring_size *
sizeof(struct sky2_tx_le),
&sky2->tx_le_map);
if (!sky2->tx_le)
goto err_out;
- sky2->tx_ring = kcalloc(TX_RING_SIZE, sizeof(struct tx_ring_info),
+ sky2->tx_ring = kcalloc(sky2->tx_ring_size, sizeof(struct tx_ring_info),
GFP_KERNEL);
if (!sky2->tx_ring)
goto err_out;
@@ -1491,7 +1493,7 @@
sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), ECU_TXFF_LEV);
sky2_prefetch_init(hw, txqaddr[port], sky2->tx_le_map,
- TX_RING_SIZE - 1);
+ sky2->tx_ring_size - 1);
#ifdef SKY2_VLAN_TAG_USED
sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);
@@ -1520,7 +1522,7 @@
}
if (sky2->tx_le) {
pci_free_consistent(hw->pdev,
- TX_RING_SIZE * sizeof(struct sky2_tx_le),
+ sky2->tx_ring_size * sizeof(struct sky2_tx_le),
sky2->tx_le, sky2->tx_le_map);
sky2->tx_le = NULL;
}
@@ -1533,15 +1535,15 @@
}
/* Modular subtraction in ring */
-static inline int tx_dist(unsigned tail, unsigned head)
+static inline int tx_inuse(const struct sky2_port *sky2)
{
- return (head - tail) & (TX_RING_SIZE - 1);
+ return (sky2->tx_prod - sky2->tx_cons) & (sky2->tx_ring_size - 1);
}
/* Number of list elements available for next tx */
static inline int tx_avail(const struct sky2_port *sky2)
{
- return sky2->tx_pending - tx_dist(sky2->tx_cons, sky2->tx_prod);
+ return sky2->tx_pending - tx_inuse(sky2);
}
/* Estimate of number of transmit list elements required */
@@ -1717,7 +1719,7 @@
return NETDEV_TX_OK;
mapping_unwind:
- for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, TX_RING_SIZE)) {
+ for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, sky2->tx_ring_size)) {
le = sky2->tx_le + i;
re = sky2->tx_ring + i;
@@ -1760,10 +1762,10 @@
struct pci_dev *pdev = sky2->hw->pdev;
unsigned idx;
- BUG_ON(done >= TX_RING_SIZE);
+ BUG_ON(done >= sky2->tx_ring_size);
for (idx = sky2->tx_cons; idx != done;
- idx = RING_NEXT(idx, TX_RING_SIZE)) {
+ idx = RING_NEXT(idx, sky2->tx_ring_size)) {
struct sky2_tx_le *le = sky2->tx_le + idx;
struct tx_ring_info *re = sky2->tx_ring + idx;
@@ -1799,7 +1801,7 @@
else
dev_kfree_skb_any(skb);
- sky2->tx_next = RING_NEXT(idx, TX_RING_SIZE);
+ sky2->tx_next = RING_NEXT(idx, sky2->tx_ring_size);
}
}
@@ -1907,7 +1909,7 @@
kfree(sky2->rx_ring);
pci_free_consistent(hw->pdev,
- TX_RING_SIZE * sizeof(struct sky2_tx_le),
+ sky2->tx_ring_size * sizeof(struct sky2_tx_le),
sky2->tx_le, sky2->tx_le_map);
kfree(sky2->tx_ring);
@@ -2517,7 +2519,6 @@
case OP_TXINDEXLE:
/* TX index reports status for both ports */
- BUILD_BUG_ON(TX_RING_SIZE > 0x1000);
sky2_tx_done(hw->dev[0], status & 0xfff);
if (hw->dev[1])
sky2_tx_done(hw->dev[1],
@@ -3669,7 +3670,7 @@
ecmd->rx_coalesce_usecs_irq > tmax)
return -EINVAL;
- if (ecmd->tx_max_coalesced_frames >= TX_RING_SIZE-1)
+ if (ecmd->tx_max_coalesced_frames >= sky2->tx_ring_size-1)
return -EINVAL;
if (ecmd->rx_max_coalesced_frames > RX_MAX_PENDING)
return -EINVAL;
@@ -3713,7 +3714,7 @@
ering->rx_max_pending = RX_MAX_PENDING;
ering->rx_mini_max_pending = 0;
ering->rx_jumbo_max_pending = 0;
- ering->tx_max_pending = TX_RING_SIZE - 1;
+ ering->tx_max_pending = TX_MAX_PENDING;
ering->rx_pending = sky2->rx_pending;
ering->rx_mini_pending = 0;
@@ -3728,14 +3729,15 @@
if (ering->rx_pending > RX_MAX_PENDING ||
ering->rx_pending < 8 ||
- ering->tx_pending < MAX_SKB_TX_LE ||
- ering->tx_pending > TX_RING_SIZE - 1)
+ ering->tx_pending < TX_MIN_PENDING ||
+ ering->tx_pending > TX_MAX_PENDING)
return -EINVAL;
sky2_detach(dev);
sky2->rx_pending = ering->rx_pending;
sky2->tx_pending = ering->tx_pending;
+ sky2->tx_ring_size = roundup_pow_of_two(sky2->tx_pending+1);
return sky2_reattach(dev);
}
@@ -4105,8 +4107,8 @@
/* Dump contents of tx ring */
sop = 1;
- for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < TX_RING_SIZE;
- idx = RING_NEXT(idx, TX_RING_SIZE)) {
+ for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < sky2->tx_ring_size;
+ idx = RING_NEXT(idx, sky2->tx_ring_size)) {
const struct sky2_tx_le *le = sky2->tx_le + idx;
u32 a = le32_to_cpu(le->addr);
@@ -4315,7 +4317,9 @@
sky2->wol = wol;
spin_lock_init(&sky2->phy_lock);
+
sky2->tx_pending = TX_DEF_PENDING;
+ sky2->tx_ring_size = roundup_pow_of_two(TX_DEF_PENDING+1);
sky2->rx_pending = RX_DEF_PENDING;
hw->dev[port] = dev;