SGISEEQ: use cached memory access to make driver work on IP28
SGI IP28 machines would need special treatment (enable adding addtional wait states) when accessing memory uncached. To avoid this pain I changed the driver to use only cached access to memory. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Thomas Bogendoerfer
David S. Miller
parent
b0cd2f9016
commit
43831b1581
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@ -12,7 +12,6 @@
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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@ -53,14 +52,35 @@ static char *sgiseeqstr = "SGI Seeq8003";
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sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
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sp->tx_old - sp->tx_new - 1)
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#define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
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(dma_addr_t)((unsigned long)(v) - \
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(unsigned long)((sp)->rx_desc)))
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#define DMA_SYNC_DESC_CPU(dev, addr) \
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do { dma_cache_sync((dev)->dev.parent, (void *)addr, \
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sizeof(struct sgiseeq_rx_desc), DMA_FROM_DEVICE); } while (0)
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#define DMA_SYNC_DESC_DEV(dev, addr) \
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do { dma_cache_sync((dev)->dev.parent, (void *)addr, \
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sizeof(struct sgiseeq_rx_desc), DMA_TO_DEVICE); } while (0)
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/* Copy frames shorter than rx_copybreak, otherwise pass on up in
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* a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
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*/
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static int rx_copybreak = 100;
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#define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
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struct sgiseeq_rx_desc {
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volatile struct hpc_dma_desc rdma;
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volatile signed int buf_vaddr;
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u8 padding[PAD_SIZE];
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struct sk_buff *skb;
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};
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struct sgiseeq_tx_desc {
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volatile struct hpc_dma_desc tdma;
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volatile signed int buf_vaddr;
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u8 padding[PAD_SIZE];
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struct sk_buff *skb;
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};
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/*
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@ -163,35 +183,55 @@ static int seeq_init_ring(struct net_device *dev)
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/* Setup tx ring. */
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for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
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if (!sp->tx_desc[i].tdma.pbuf) {
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unsigned long buffer;
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buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
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sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
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}
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sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
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DMA_SYNC_DESC_DEV(dev, &sp->tx_desc[i]);
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}
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/* And now the rx ring. */
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for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
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if (!sp->rx_desc[i].rdma.pbuf) {
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unsigned long buffer;
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dma_addr_t dma_addr;
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struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
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buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
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if (!buffer)
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if (skb == NULL)
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return -ENOMEM;
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sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
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sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
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skb_reserve(skb, 2);
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dma_addr = dma_map_single(dev->dev.parent,
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skb->data - 2,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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sp->rx_desc[i].skb = skb;
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sp->rx_desc[i].rdma.pbuf = dma_addr;
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}
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sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
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DMA_SYNC_DESC_DEV(dev, &sp->rx_desc[i]);
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}
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sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
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DMA_SYNC_DESC_DEV(dev, &sp->rx_desc[i - 1]);
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return 0;
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}
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static void seeq_purge_ring(struct net_device *dev)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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int i;
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/* clear tx ring. */
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for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
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if (sp->tx_desc[i].skb) {
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dev_kfree_skb(sp->tx_desc[i].skb);
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sp->tx_desc[i].skb = NULL;
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}
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}
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/* And now the rx ring. */
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for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
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if (sp->rx_desc[i].skb) {
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dev_kfree_skb(sp->rx_desc[i].skb);
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sp->rx_desc[i].skb = NULL;
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}
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}
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}
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#ifdef DEBUG
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static struct sgiseeq_private *gpriv;
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static struct net_device *gdev;
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@ -258,8 +298,8 @@ static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
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sregs->tstat = TSTAT_INIT_SEEQ;
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}
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hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
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hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
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hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
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hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
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seeq_go(sp, hregs, sregs);
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return 0;
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@ -283,69 +323,90 @@ static inline void rx_maybe_restart(struct sgiseeq_private *sp,
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struct sgiseeq_regs *sregs)
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{
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if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
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hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
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hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
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seeq_go(sp, hregs, sregs);
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}
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}
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#define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
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!((rd)->rdma.cntinfo & HPCDMA_OWN); \
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(rd) = &(sp)->rx_desc[(sp)->rx_new])
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static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs,
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struct sgiseeq_regs *sregs)
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{
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struct sgiseeq_rx_desc *rd;
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struct sk_buff *skb = NULL;
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struct sk_buff *newskb;
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unsigned char pkt_status;
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unsigned char *pkt_pointer = NULL;
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int len = 0;
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unsigned int orig_end = PREV_RX(sp->rx_new);
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/* Service every received packet. */
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for_each_rx(rd, sp) {
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rd = &sp->rx_desc[sp->rx_new];
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DMA_SYNC_DESC_CPU(dev, rd);
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while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
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len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
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pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
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pkt_status = pkt_pointer[len + 2];
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dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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pkt_status = rd->skb->data[len];
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if (pkt_status & SEEQ_RSTAT_FIG) {
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/* Packet is OK. */
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skb = dev_alloc_skb(len + 2);
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if (skb) {
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skb_reserve(skb, 2);
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skb_put(skb, len);
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/* Copy out of kseg1 to avoid silly cache flush. */
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skb_copy_to_linear_data(skb, pkt_pointer + 2, len);
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skb->protocol = eth_type_trans(skb, dev);
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/* We don't want to receive our own packets */
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if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
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/* We don't want to receive our own packets */
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if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) {
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if (len > rx_copybreak) {
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skb = rd->skb;
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newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
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if (!newskb) {
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newskb = skb;
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skb = NULL;
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goto memory_squeeze;
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}
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skb_reserve(newskb, 2);
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} else {
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skb = netdev_alloc_skb(dev, len + 2);
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if (skb) {
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skb_reserve(skb, 2);
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skb_copy_to_linear_data(skb, rd->skb->data, len);
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}
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newskb = rd->skb;
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}
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memory_squeeze:
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if (skb) {
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skb_put(skb, len);
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skb->protocol = eth_type_trans(skb, dev);
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netif_rx(skb);
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dev->last_rx = jiffies;
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += len;
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} else {
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/* Silently drop my own packets */
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dev_kfree_skb_irq(skb);
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printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
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dev->name);
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dev->stats.rx_dropped++;
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}
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} else {
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printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
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dev->name);
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dev->stats.rx_dropped++;
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/* Silently drop my own packets */
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newskb = rd->skb;
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}
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} else {
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record_rx_errors(dev, pkt_status);
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newskb = rd->skb;
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}
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rd->skb = newskb;
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rd->rdma.pbuf = dma_map_single(dev->dev.parent,
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newskb->data - 2,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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/* Return the entry to the ring pool. */
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rd->rdma.cntinfo = RCNTINFO_INIT;
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sp->rx_new = NEXT_RX(sp->rx_new);
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DMA_SYNC_DESC_DEV(dev, rd);
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rd = &sp->rx_desc[sp->rx_new];
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DMA_SYNC_DESC_CPU(dev, rd);
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}
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DMA_SYNC_DESC_CPU(dev, &sp->rx_desc[orig_end]);
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sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
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DMA_SYNC_DESC_DEV(dev, &sp->rx_desc[orig_end]);
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DMA_SYNC_DESC_CPU(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
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sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
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DMA_SYNC_DESC_DEV(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
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rx_maybe_restart(sp, hregs, sregs);
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}
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@ -358,20 +419,29 @@ static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
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}
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}
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static inline void kick_tx(struct sgiseeq_tx_desc *td,
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static inline void kick_tx(struct net_device *dev,
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struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs)
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{
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struct sgiseeq_tx_desc *td;
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int i = sp->tx_old;
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/* If the HPC aint doin nothin, and there are more packets
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* with ETXD cleared and XIU set we must make very certain
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* that we restart the HPC else we risk locking up the
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* adapter. The following code is only safe iff the HPCDMA
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* is not active!
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*/
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td = &sp->tx_desc[i];
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DMA_SYNC_DESC_CPU(dev, td);
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while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
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(HPCDMA_XIU | HPCDMA_ETXD))
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td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext);
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(HPCDMA_XIU | HPCDMA_ETXD)) {
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i = NEXT_TX(i);
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td = &sp->tx_desc[i];
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DMA_SYNC_DESC_CPU(dev, td);
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}
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if (td->tdma.cntinfo & HPCDMA_XIU) {
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hregs->tx_ndptr = CPHYSADDR(td);
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hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
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hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
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}
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}
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@ -400,11 +470,12 @@ static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp
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for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
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td = &sp->tx_desc[j];
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DMA_SYNC_DESC_CPU(dev, td);
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if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
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break;
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if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
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if (!(status & HPC3_ETXCTRL_ACTIVE)) {
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hregs->tx_ndptr = CPHYSADDR(td);
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hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
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hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
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}
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break;
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@ -413,6 +484,11 @@ static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp
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sp->tx_old = NEXT_TX(sp->tx_old);
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td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
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td->tdma.cntinfo |= HPCDMA_EOX;
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if (td->skb) {
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dev_kfree_skb_any(td->skb);
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td->skb = NULL;
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}
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DMA_SYNC_DESC_DEV(dev, td);
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}
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}
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@ -480,6 +556,7 @@ static int sgiseeq_close(struct net_device *dev)
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/* Shutdown the Seeq. */
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reset_hpc3_and_seeq(sp->hregs, sregs);
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free_irq(irq, dev);
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seeq_purge_ring(dev);
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return 0;
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}
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@ -506,16 +583,22 @@ static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
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struct hpc3_ethregs *hregs = sp->hregs;
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unsigned long flags;
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struct sgiseeq_tx_desc *td;
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int skblen, len, entry;
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int len, entry;
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spin_lock_irqsave(&sp->tx_lock, flags);
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/* Setup... */
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skblen = skb->len;
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len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
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len = skb->len;
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if (len < ETH_ZLEN) {
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if (skb_padto(skb, ETH_ZLEN))
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return 0;
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len = ETH_ZLEN;
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}
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dev->stats.tx_bytes += len;
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entry = sp->tx_new;
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td = &sp->tx_desc[entry];
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DMA_SYNC_DESC_CPU(dev, td);
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/* Create entry. There are so many races with adding a new
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* descriptor to the chain:
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@ -530,25 +613,27 @@ static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
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* entry and the HPC got to the end of the chain before we
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* added this new entry and restarted it.
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*/
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skb_copy_from_linear_data(skb, (char *)(long)td->buf_vaddr, skblen);
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if (len != skblen)
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memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
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td->skb = skb;
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td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
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len, DMA_TO_DEVICE);
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td->tdma.cntinfo = (len & HPCDMA_BCNT) |
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HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
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DMA_SYNC_DESC_DEV(dev, td);
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if (sp->tx_old != sp->tx_new) {
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struct sgiseeq_tx_desc *backend;
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backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
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DMA_SYNC_DESC_CPU(dev, backend);
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backend->tdma.cntinfo &= ~HPCDMA_EOX;
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DMA_SYNC_DESC_DEV(dev, backend);
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}
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sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
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/* Maybe kick the HPC back into motion. */
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if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
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kick_tx(&sp->tx_desc[sp->tx_old], hregs);
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kick_tx(dev, sp, hregs);
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dev->trans_start = jiffies;
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dev_kfree_skb(skb);
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if (!TX_BUFFS_AVAIL(sp))
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netif_stop_queue(dev);
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@ -586,33 +671,41 @@ static void sgiseeq_set_multicast(struct net_device *dev)
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sgiseeq_reset(dev);
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}
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static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
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static inline void setup_tx_ring(struct net_device *dev,
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struct sgiseeq_tx_desc *buf,
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int nbufs)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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int i = 0;
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while (i < (nbufs - 1)) {
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buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
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buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
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buf[i].tdma.pbuf = 0;
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DMA_SYNC_DESC_DEV(dev, &buf[i]);
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i++;
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}
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buf[i].tdma.pnext = CPHYSADDR(buf);
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buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
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DMA_SYNC_DESC_DEV(dev, &buf[i]);
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}
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static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
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static inline void setup_rx_ring(struct net_device *dev,
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struct sgiseeq_rx_desc *buf,
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int nbufs)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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||||
int i = 0;
|
||||
|
||||
while (i < (nbufs - 1)) {
|
||||
buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
|
||||
buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
|
||||
buf[i].rdma.pbuf = 0;
|
||||
DMA_SYNC_DESC_DEV(dev, &buf[i]);
|
||||
i++;
|
||||
}
|
||||
buf[i].rdma.pbuf = 0;
|
||||
buf[i].rdma.pnext = CPHYSADDR(buf);
|
||||
buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
|
||||
DMA_SYNC_DESC_DEV(dev, &buf[i]);
|
||||
}
|
||||
|
||||
#define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf))
|
||||
|
||||
static int __init sgiseeq_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct sgiseeq_platform_data *pd = pdev->dev.platform_data;
|
||||
|
|
@ -621,7 +714,7 @@ static int __init sgiseeq_probe(struct platform_device *pdev)
|
|||
unsigned int irq = pd->irq;
|
||||
struct sgiseeq_private *sp;
|
||||
struct net_device *dev;
|
||||
int err, i;
|
||||
int err;
|
||||
DECLARE_MAC_BUF(mac);
|
||||
|
||||
dev = alloc_etherdev(sizeof (struct sgiseeq_private));
|
||||
|
|
@ -635,7 +728,7 @@ static int __init sgiseeq_probe(struct platform_device *pdev)
|
|||
sp = netdev_priv(dev);
|
||||
|
||||
/* Make private data page aligned */
|
||||
sr = dma_alloc_coherent(&pdev->dev, sizeof(*sp->srings),
|
||||
sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
|
||||
&sp->srings_dma, GFP_KERNEL);
|
||||
if (!sr) {
|
||||
printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
|
||||
|
|
@ -647,8 +740,8 @@ static int __init sgiseeq_probe(struct platform_device *pdev)
|
|||
sp->tx_desc = sp->srings->txvector;
|
||||
|
||||
/* A couple calculations now, saves many cycles later. */
|
||||
setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
|
||||
setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
|
||||
setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
|
||||
setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
|
||||
|
||||
memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
|
||||
|
||||
|
|
@ -716,8 +809,8 @@ static int __exit sgiseeq_remove(struct platform_device *pdev)
|
|||
struct sgiseeq_private *sp = netdev_priv(dev);
|
||||
|
||||
unregister_netdev(dev);
|
||||
dma_free_coherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
|
||||
sp->srings_dma);
|
||||
dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
|
||||
sp->srings_dma);
|
||||
free_netdev(dev);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue