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Date: Tue, 2 Oct 2007 16:25:53 -0500
From: Olof Johansson <olof@...om.net>
To: jgarzik@...ox.com
Cc: netdev@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH] [3/11] 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@...om.net>
Index: k.org/drivers/net/pasemi_mac.c
===================================================================
--- k.org.orig/drivers/net/pasemi_mac.c
+++ k.org/drivers/net/pasemi_mac.c
@@ -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
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
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
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
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
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 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) {
- pci_unmap_single(mac->dma_pdev,
- info->dma,
- info->skb->len,
- PCI_DMA_TODEVICE);
- dev_kfree_skb_any(info->skb);
- }
- info->dma = 0;
- info->skb = NULL;
- dp->mactx = 0;
- dp->ptr = 0;
+ 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;
}
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;
}
@@ -338,34 +332,31 @@ static void pasemi_mac_free_rx_resources
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) {
- pci_unmap_single(mac->dma_pdev,
- info->dma,
- info->skb->len,
- PCI_DMA_FROMDEVICE);
- dev_kfree_skb_any(info->skb);
- }
- info->dma = 0;
- info->skb = NULL;
- dp->macrx = 0;
- dp->ptr = 0;
+ info = &RX_RING_INFO(mac, i);
+ if (info->skb && info->dma) {
+ pci_unmap_single(mac->dma_pdev,
+ info->dma,
+ info->skb->len,
+ PCI_DMA_FROMDEVICE);
+ dev_kfree_skb_any(info->skb);
}
+ info->dma = 0;
+ info->skb = NULL;
}
+ 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
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
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 pa
{
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 pa
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 pa
* 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 pa
} 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 pa
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 pa
{
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 @@ restart:
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
{
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
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
}
}
- 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;
+
+ TX_RING_INFO(mac, txring->next_to_fill+1).dma = map;
+ TX_RING_INFO(mac, txring->next_to_fill+1).skb = skb;
- dp->mactx = mactx;
- dp->ptr = ptr;
- info->dma = map;
- info->skb = skb;
+ txring->next_to_fill += 2;
- txring->next_to_fill++;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
Index: k.org/drivers/net/pasemi_mac.h
===================================================================
--- k.org.orig/drivers/net/pasemi_mac.h
+++ k.org/drivers/net/pasemi_mac.h
@@ -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,
-
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