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sky2: dynamic size transmit ring

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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:
Stephen Hemminger 2009-08-18 15:17:08 +00:00 committed by David S. Miller
parent c119731d66
commit ee5f68fea2
2 changed files with 28 additions and 23 deletions
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50
drivers/net/sky2.c
View File

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

1
drivers/net/sky2.h
View File

@ -2011,6 +2011,7 @@ struct sky2_port {
struct tx_ring_info *tx_ring; struct tx_ring_info *tx_ring;
struct sky2_tx_le *tx_le; struct sky2_tx_le *tx_le;
u16 tx_ring_size;
u16 tx_cons; /* next le to check */ u16 tx_cons; /* next le to check */
u16 tx_prod; /* next le to use */ u16 tx_prod; /* next le to use */
u16 tx_next; /* debug only */ u16 tx_next; /* debug only */