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pasemi_mac: rework ring management 

pasemi_mac: rework ring management

Rework ring management, switching to an opaque ring format instead of
the struct-based descriptor+pointer setup, since it will be needed for
SG support.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Olof Johansson 2007-10-02 16:25:53 -05:00 committed by David S. Miller
parent 18eec69542
commit fc9e4d2a93
2 changed files with 107 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

183
drivers/net/pasemi_mac.c
View File

@ -63,10 +63,10 @@
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
#define TX_DESC(mac, num) ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
#define TX_DESC_INFO(mac, num) ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
#define RX_DESC(mac, num) ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
#define RX_DESC_INFO(mac, num) ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
#define TX_RING(mac, num) ((mac)->tx->ring[(num) & (TX_RING_SIZE-1)])
#define TX_RING_INFO(mac, num) ((mac)->tx->ring_info[(num) & (TX_RING_SIZE-1)])
#define RX_RING(mac, num) ((mac)->rx->ring[(num) & (RX_RING_SIZE-1)])
#define RX_RING_INFO(mac, num) ((mac)->rx->ring_info[(num) & (RX_RING_SIZE-1)])
#define RX_BUFF(mac, num) ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
#define RING_USED(ring) (((ring)->next_to_fill - (ring)->next_to_clean) \
@ -174,22 +174,21 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
spin_lock_init(&ring->lock);
ring->size = RX_RING_SIZE;
ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
RX_RING_SIZE, GFP_KERNEL);
if (!ring->desc_info)
goto out_desc_info;
if (!ring->ring_info)
goto out_ring_info;
/* Allocate descriptors */
ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE *
sizeof(struct pas_dma_xct_descr),
ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(u64),
&ring->dma, GFP_KERNEL);
if (!ring->desc)
goto out_desc;
if (!ring->ring)
goto out_ring_desc;
memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
memset(ring->ring, 0, RX_RING_SIZE * sizeof(u64));
ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(u64),
@ -203,7 +202,7 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id),
PAS_DMA_RXCHAN_CFG_HBU(2));
@ -229,11 +228,11 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
out_buffers:
dma_free_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->rx->desc, mac->rx->dma);
out_desc:
kfree(ring->desc_info);
out_desc_info:
RX_RING_SIZE * sizeof(u64),
mac->rx->ring, mac->rx->dma);
out_ring_desc:
kfree(ring->ring_info);
out_ring_info:
kfree(ring);
out_ring:
return -ENOMEM;
@ -254,25 +253,24 @@ static int pasemi_mac_setup_tx_resources(struct net_device *dev)
spin_lock_init(&ring->lock);
ring->size = TX_RING_SIZE;
ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
TX_RING_SIZE, GFP_KERNEL);
if (!ring->desc_info)
goto out_desc_info;
if (!ring->ring_info)
goto out_ring_info;
/* Allocate descriptors */
ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
TX_RING_SIZE *
sizeof(struct pas_dma_xct_descr),
ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
TX_RING_SIZE * sizeof(u64),
&ring->dma, GFP_KERNEL);
if (!ring->desc)
goto out_desc;
if (!ring->ring)
goto out_ring_desc;
memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
memset(ring->ring, 0, TX_RING_SIZE * sizeof(u64));
write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(chan_id),
PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(chan_id), val);
@ -291,9 +289,9 @@ static int pasemi_mac_setup_tx_resources(struct net_device *dev)
return 0;
out_desc:
kfree(ring->desc_info);
out_desc_info:
out_ring_desc:
kfree(ring->ring_info);
out_ring_info:
kfree(ring);
out_ring:
return -ENOMEM;
@ -304,31 +302,27 @@ static void pasemi_mac_free_tx_resources(struct net_device *dev)
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
for (i = 0; i < TX_RING_SIZE; i++) {
info = &TX_DESC_INFO(mac, i);
dp = &TX_DESC(mac, i);
if (info->dma) {
if (info->skb) {
for (i = 0; i < TX_RING_SIZE; i += 2) {
info = &TX_RING_INFO(mac, i+1);
if (info->dma && info->skb) {
pci_unmap_single(mac->dma_pdev,
info->dma,
info->skb->len,
PCI_DMA_TODEVICE);
dev_kfree_skb_any(info->skb);
}
TX_RING(mac, i) = 0;
TX_RING(mac, i+1) = 0;
info->dma = 0;
info->skb = NULL;
dp->mactx = 0;
dp->ptr = 0;
}
}
dma_free_coherent(&mac->dma_pdev->dev,
TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->tx->desc, mac->tx->dma);
TX_RING_SIZE * sizeof(u64),
mac->tx->ring, mac->tx->dma);
kfree(mac->tx->desc_info);
kfree(mac->tx->ring_info);
kfree(mac->tx);
mac->tx = NULL;
}
@ -338,13 +332,10 @@ static void pasemi_mac_free_rx_resources(struct net_device *dev)
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
for (i = 0; i < RX_RING_SIZE; i++) {
info = &RX_DESC_INFO(mac, i);
dp = &RX_DESC(mac, i);
if (info->skb) {
if (info->dma) {
info = &RX_RING_INFO(mac, i);
if (info->skb && info->dma) {
pci_unmap_single(mac->dma_pdev,
info->dma,
info->skb->len,
@ -353,19 +344,19 @@ static void pasemi_mac_free_rx_resources(struct net_device *dev)
}
info->dma = 0;
info->skb = NULL;
dp->macrx = 0;
dp->ptr = 0;
}
}
for (i = 0; i < RX_RING_SIZE; i++)
RX_RING(mac, i) = 0;
dma_free_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->rx->desc, mac->rx->dma);
RX_RING_SIZE * sizeof(u64),
mac->rx->ring, mac->rx->dma);
dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
mac->rx->buffers, mac->rx->buf_dma);
kfree(mac->rx->desc_info);
kfree(mac->rx->ring_info);
kfree(mac->rx);
mac->rx = NULL;
}
@ -373,20 +364,22 @@ static void pasemi_mac_free_rx_resources(struct net_device *dev)
static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
int start = mac->rx->next_to_fill;
int count;
unsigned int fill, count;
if (limit <= 0)
return;
i = start;
fill = start;
for (count = 0; count < limit; count++) {
struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
u64 *buff = &RX_BUFF(mac, i);
struct pasemi_mac_buffer *info = &RX_RING_INFO(mac, fill);
u64 *buff = &RX_BUFF(mac, fill);
struct sk_buff *skb;
dma_addr_t dma;
/* Entry in use? */
WARN_ON(*buff);
/* skb might still be in there for recycle on short receives */
if (info->skb)
skb = info->skb;
@ -407,7 +400,7 @@ static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
info->skb = skb;
info->dma = dma;
*buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
i++;
fill++;
}
wmb();
@ -481,7 +474,6 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
{
unsigned int n;
int count;
struct pas_dma_xct_descr *dp;
struct pasemi_mac_buffer *info;
struct sk_buff *skb;
unsigned int i, len;
@ -496,9 +488,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
rmb();
dp = &RX_DESC(mac, n);
prefetchw(dp);
macrx = dp->macrx;
macrx = RX_RING(mac, n);
if ((macrx & XCT_MACRX_E) ||
(*mac->rx_status & PAS_STATUS_ERROR))
@ -516,12 +506,15 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
* interface ring.
*/
dma = (dp->ptr & XCT_PTR_ADDR_M);
for (i = n; i < (n + RX_RING_SIZE); i++) {
info = &RX_DESC_INFO(mac, i);
dma = (RX_RING(mac, n+1) & XCT_PTR_ADDR_M);
for (i = mac->rx->next_to_fill;
i < (mac->rx->next_to_fill + RX_RING_SIZE);
i++) {
info = &RX_RING_INFO(mac, i);
if (info->dma == dma)
break;
}
prefetchw(info);
skb = info->skb;
@ -546,6 +539,11 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
} else
info->skb = NULL;
/* Need to zero it out since hardware doesn't, since the
* replenish loop uses it to tell when it's done.
*/
RX_BUFF(mac, i) = 0;
skb_put(skb, len);
if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
@ -561,13 +559,13 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
skb->protocol = eth_type_trans(skb, mac->netdev);
netif_receive_skb(skb);
dp->ptr = 0;
dp->macrx = 0;
RX_RING(mac, n) = 0;
RX_RING(mac, n+1) = 0;
n++;
n += 2;
}
mac->rx->next_to_clean += limit - count;
mac->rx->next_to_clean = n;
pasemi_mac_replenish_rx_ring(mac->netdev, limit-count);
spin_unlock(&mac->rx->lock);
@ -579,7 +577,6 @@ static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
{
int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
unsigned int start, count, limit;
unsigned int total_count;
unsigned long flags;
@ -595,29 +592,28 @@ static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
count = 0;
for (i = start; i < limit; i++) {
dp = &TX_DESC(mac, i);
if ((dp->mactx & XCT_MACTX_E) ||
for (i = start; i < limit; i += 2) {
u64 mactx = TX_RING(mac, i);
if ((mactx & XCT_MACTX_E) ||
(*mac->tx_status & PAS_STATUS_ERROR))
pasemi_mac_tx_error(mac, dp->mactx);
pasemi_mac_tx_error(mac, mactx);
if (unlikely(dp->mactx & XCT_MACTX_O))
if (unlikely(mactx & XCT_MACTX_O))
/* Not yet transmitted */
break;
info = &TX_DESC_INFO(mac, i);
info = &TX_RING_INFO(mac, i+1);
skbs[count] = info->skb;
dmas[count] = info->dma;
info->skb = NULL;
info->dma = 0;
dp->mactx = 0;
dp->ptr = 0;
TX_RING(mac, i) = 0;
TX_RING(mac, i+1) = 0;
count++;
}
mac->tx->next_to_clean += count;
mac->tx->next_to_clean += count * 2;
spin_unlock_irqrestore(&mac->tx->lock, flags);
netif_wake_queue(mac->netdev);
@ -1001,8 +997,6 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
struct pasemi_mac_txring *txring;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
u64 dflags, mactx, ptr;
dma_addr_t map;
unsigned long flags;
@ -1038,13 +1032,13 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&txring->lock, flags);
if (RING_AVAIL(txring) <= 1) {
if (RING_AVAIL(txring) <= 2) {
spin_unlock_irqrestore(&txring->lock, flags);
pasemi_mac_clean_tx(mac);
pasemi_mac_restart_tx_intr(mac);
spin_lock_irqsave(&txring->lock, flags);
if (RING_AVAIL(txring) <= 1) {
if (RING_AVAIL(txring) <= 2) {
/* Still no room -- stop the queue and wait for tx
* intr when there's room.
*/
@ -1053,15 +1047,14 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
}
}
dp = &TX_DESC(mac, txring->next_to_fill);
info = &TX_DESC_INFO(mac, txring->next_to_fill);
TX_RING(mac, txring->next_to_fill) = mactx;
TX_RING(mac, txring->next_to_fill+1) = ptr;
dp->mactx = mactx;
dp->ptr = ptr;
info->dma = map;
info->skb = skb;
TX_RING_INFO(mac, txring->next_to_fill+1).dma = map;
TX_RING_INFO(mac, txring->next_to_fill+1).skb = skb;
txring->next_to_fill += 2;
txring->next_to_fill++;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;

23
drivers/net/pasemi_mac.h
View File

@ -28,25 +28,25 @@
struct pasemi_mac_txring {
spinlock_t lock;
struct pas_dma_xct_descr *desc;
u64 *ring;
dma_addr_t dma;
unsigned int size;
unsigned int next_to_fill;
unsigned int next_to_clean;
struct pasemi_mac_buffer *desc_info;
struct pasemi_mac_buffer *ring_info;
char irq_name[10]; /* "eth%d tx" */
};
struct pasemi_mac_rxring {
spinlock_t lock;
struct pas_dma_xct_descr *desc; /* RX channel descriptor ring */
u64 *ring; /* RX channel descriptor ring */
dma_addr_t dma;
u64 *buffers; /* RX interface buffer ring */
dma_addr_t buf_dma;
unsigned int size;
unsigned int next_to_fill;
unsigned int next_to_clean;
struct pasemi_mac_buffer *desc_info;
struct pasemi_mac_buffer *ring_info;
char irq_name[10]; /* "eth%d rx" */
};
@ -88,7 +88,7 @@ struct pasemi_mac {
char phy_id[BUS_ID_SIZE];
};
/* Software status descriptor (desc_info) */
/* Software status descriptor (ring_info) */
struct pasemi_mac_buffer {
struct sk_buff *skb;
dma_addr_t dma;
@ -101,20 +101,7 @@ struct pasdma_status {
u64 tx_sta[20];
};
/* descriptor structure */
struct pas_dma_xct_descr {
union {
u64 mactx;
u64 macrx;
};
union {
u64 ptr;
u64 rxb;
};
};
/* MAC CFG register offsets */
enum {
PAS_MAC_CFG_PCFG = 0x80,
PAS_MAC_CFG_TXP = 0x98,