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author | 2019-08-30 11:25:34 +0200 | |
---|---|---|
committer | 2019-08-30 13:54:36 -0700 | |
commit | ed870f6a7aa2120720e9cd463926969699036eaa (patch) | |
tree | 9b9a15d76b6196fe1975d0ae0ba5fae62ec6881c /drivers/net/ethernet/sgi | |
parent | net: sgi: ioc3-eth: refactor rx buffer allocation (diff) | |
download | linux-ed870f6a7aa2120720e9cd463926969699036eaa.tar.gz linux-ed870f6a7aa2120720e9cd463926969699036eaa.tar.bz2 linux-ed870f6a7aa2120720e9cd463926969699036eaa.zip |
net: sgi: ioc3-eth: use dma-direct for dma allocations
Replace the homegrown DMA memory allocation, which only works on
SGI-IP27 machines, with the generic dma allocations.
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sgi')
-rw-r--r-- | drivers/net/ethernet/sgi/ioc3-eth.c | 146 |
1 files changed, 113 insertions, 33 deletions
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c index 7531944d2e95..ed8f997a3cec 100644 --- a/drivers/net/ethernet/sgi/ioc3-eth.c +++ b/drivers/net/ethernet/sgi/ioc3-eth.c @@ -36,7 +36,6 @@ #include <linux/ip.h> #include <linux/tcp.h> #include <linux/udp.h> -#include <linux/dma-mapping.h> #include <linux/gfp.h> #ifdef CONFIG_SERIAL_8250 @@ -49,6 +48,8 @@ #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/skbuff.h> +#include <linux/dma-direct.h> + #include <net/ip.h> #include <asm/byteorder.h> @@ -64,10 +65,12 @@ #define RX_BUFFS 64 #define RX_RING_ENTRIES 512 /* fixed in hardware */ #define RX_RING_MASK (RX_RING_ENTRIES - 1) +#define RX_RING_SIZE (RX_RING_ENTRIES * sizeof(u64)) /* 128 TX buffers (not tunable) */ #define TX_RING_ENTRIES 128 #define TX_RING_MASK (TX_RING_ENTRIES - 1) +#define TX_RING_SIZE (TX_RING_ENTRIES * sizeof(struct ioc3_etxd)) /* IOC3 does dma transfers in 128 byte blocks */ #define IOC3_DMA_XFER_LEN 128UL @@ -83,9 +86,12 @@ struct ioc3_private { struct ioc3_ethregs *regs; struct ioc3 *all_regs; + struct device *dma_dev; u32 *ssram; unsigned long *rxr; /* pointer to receiver ring */ struct ioc3_etxd *txr; + dma_addr_t rxr_dma; + dma_addr_t txr_dma; struct sk_buff *rx_skbs[RX_RING_ENTRIES]; struct sk_buff *tx_skbs[TX_RING_ENTRIES]; int rx_ci; /* RX consumer index */ @@ -125,9 +131,11 @@ static inline unsigned long aligned_rx_skb_addr(unsigned long addr) return (~addr + 1) & (IOC3_DMA_XFER_LEN - 1UL); } -static inline int ioc3_alloc_skb(struct sk_buff **skb, struct ioc3_erxbuf **rxb) +static inline int ioc3_alloc_skb(struct ioc3_private *ip, struct sk_buff **skb, + struct ioc3_erxbuf **rxb, dma_addr_t *rxb_dma) { struct sk_buff *new_skb; + dma_addr_t d; int offset; new_skb = alloc_skb(RX_BUF_SIZE + IOC3_DMA_XFER_LEN - 1, GFP_ATOMIC); @@ -139,6 +147,14 @@ static inline int ioc3_alloc_skb(struct sk_buff **skb, struct ioc3_erxbuf **rxb) if (offset) skb_reserve(new_skb, offset); + d = dma_map_single(ip->dma_dev, new_skb->data, + RX_BUF_SIZE, DMA_FROM_DEVICE); + + if (dma_mapping_error(ip->dma_dev, d)) { + dev_kfree_skb_any(new_skb); + return -ENOMEM; + } + *rxb_dma = d; *rxb = (struct ioc3_erxbuf *)new_skb->data; skb_reserve(new_skb, RX_OFFSET); *skb = new_skb; @@ -146,17 +162,22 @@ static inline int ioc3_alloc_skb(struct sk_buff **skb, struct ioc3_erxbuf **rxb) return 0; } -static inline unsigned long ioc3_map(void *ptr, unsigned long vdev) +#ifdef CONFIG_PCI_XTALK_BRIDGE +static inline unsigned long ioc3_map(dma_addr_t addr, unsigned long attr) { -#ifdef CONFIG_SGI_IP27 - vdev <<= 57; /* Shift to PCI64_ATTR_VIRTUAL */ + return (addr & ~PCI64_ATTR_BAR) | attr; +} - return vdev | (0xaUL << PCI64_ATTR_TARG_SHFT) | PCI64_ATTR_PREF | - ((unsigned long)ptr & TO_PHYS_MASK); +#define ERBAR_VAL (ERBAR_BARRIER_BIT << ERBAR_RXBARR_SHIFT) #else - return virt_to_bus(ptr); -#endif +static inline unsigned long ioc3_map(dma_addr_t addr, unsigned long attr) +{ + return addr; } + +#define ERBAR_VAL 0 +#endif + #define IOC3_SIZE 0x100000 static inline u32 mcr_pack(u32 pulse, u32 sample) @@ -523,6 +544,7 @@ static inline void ioc3_rx(struct net_device *dev) int rx_entry, n_entry, len; struct ioc3_erxbuf *rxb; unsigned long *rxr; + dma_addr_t d; u32 w0, err; rxr = ip->rxr; /* Ring base */ @@ -540,12 +562,13 @@ static inline void ioc3_rx(struct net_device *dev) skb_put(skb, len); skb->protocol = eth_type_trans(skb, dev); - if (ioc3_alloc_skb(&new_skb, &rxb)) { + if (ioc3_alloc_skb(ip, &new_skb, &rxb, &d)) { /* Ouch, drop packet and just recycle packet * to keep the ring filled. */ dev->stats.rx_dropped++; new_skb = skb; + d = rxr[rx_entry]; goto next; } @@ -554,6 +577,9 @@ static inline void ioc3_rx(struct net_device *dev) w0 & ERXBUF_IPCKSUM_MASK, len); + dma_unmap_single(ip->dma_dev, rxr[rx_entry], + RX_BUF_SIZE, DMA_FROM_DEVICE); + netif_rx(skb); ip->rx_skbs[rx_entry] = NULL; /* Poison */ @@ -566,15 +592,17 @@ static inline void ioc3_rx(struct net_device *dev) * recycle it. */ new_skb = skb; + d = rxr[rx_entry]; dev->stats.rx_errors++; } if (err & ERXBUF_CRCERR) /* Statistics */ dev->stats.rx_crc_errors++; if (err & ERXBUF_FRAMERR) dev->stats.rx_frame_errors++; + next: ip->rx_skbs[n_entry] = new_skb; - rxr[n_entry] = cpu_to_be64(ioc3_map(rxb, 1)); + rxr[n_entry] = cpu_to_be64(ioc3_map(d, PCI64_ATTR_BAR)); rxb->w0 = 0; /* Clear valid flag */ n_entry = (n_entry + 1) & RX_RING_MASK; /* Update erpir */ @@ -767,6 +795,26 @@ static void ioc3_mii_start(struct ioc3_private *ip) add_timer(&ip->ioc3_timer); } +static inline void ioc3_tx_unmap(struct ioc3_private *ip, int entry) +{ + struct ioc3_etxd *desc; + u32 cmd, bufcnt, len; + + desc = &ip->txr[entry]; + cmd = be32_to_cpu(desc->cmd); + bufcnt = be32_to_cpu(desc->bufcnt); + if (cmd & ETXD_B1V) { + len = (bufcnt & ETXD_B1CNT_MASK) >> ETXD_B1CNT_SHIFT; + dma_unmap_single(ip->dma_dev, be64_to_cpu(desc->p1), + len, DMA_TO_DEVICE); + } + if (cmd & ETXD_B2V) { + len = (bufcnt & ETXD_B2CNT_MASK) >> ETXD_B2CNT_SHIFT; + dma_unmap_single(ip->dma_dev, be64_to_cpu(desc->p2), + len, DMA_TO_DEVICE); + } +} + static inline void ioc3_clean_tx_ring(struct ioc3_private *ip) { struct sk_buff *skb; @@ -775,6 +823,7 @@ static inline void ioc3_clean_tx_ring(struct ioc3_private *ip) for (i = 0; i < TX_RING_ENTRIES; i++) { skb = ip->tx_skbs[i]; if (skb) { + ioc3_tx_unmap(ip, i); ip->tx_skbs[i] = NULL; dev_kfree_skb_any(skb); } @@ -787,13 +836,19 @@ static inline void ioc3_clean_tx_ring(struct ioc3_private *ip) static void ioc3_free_rx_bufs(struct ioc3_private *ip) { int rx_entry, n_entry; + struct sk_buff *skb; n_entry = ip->rx_ci; rx_entry = ip->rx_pi; while (n_entry != rx_entry) { - dev_kfree_skb_any(ip->rx_skbs[n_entry]); - + skb = ip->rx_skbs[n_entry]; + if (skb) { + dma_unmap_single(ip->dma_dev, + be64_to_cpu(ip->rxr[n_entry]), + RX_BUF_SIZE, DMA_FROM_DEVICE); + dev_kfree_skb_any(skb); + } n_entry = (n_entry + 1) & RX_RING_MASK; } } @@ -802,6 +857,7 @@ static int ioc3_alloc_rx_bufs(struct net_device *dev) { struct ioc3_private *ip = netdev_priv(dev); struct ioc3_erxbuf *rxb; + dma_addr_t d; int i; /* Now the rx buffers. The RX ring may be larger but @@ -809,11 +865,11 @@ static int ioc3_alloc_rx_bufs(struct net_device *dev) * this for performance and memory later. */ for (i = 0; i < RX_BUFFS; i++) { - if (ioc3_alloc_skb(&ip->rx_skbs[i], &rxb)) + if (ioc3_alloc_skb(ip, &ip->rx_skbs[i], &rxb, &d)) return -ENOMEM; rxb->w0 = 0; /* Clear valid flag */ - ip->rxr[i] = cpu_to_be64(ioc3_map(rxb, 1)); + ip->rxr[i] = cpu_to_be64(ioc3_map(d, PCI64_ATTR_BAR)); } ip->rx_ci = 0; ip->rx_pi = RX_BUFFS; @@ -859,13 +915,7 @@ static void ioc3_init(struct net_device *dev) readl(®s->emcr); /* Misc registers */ -#ifdef CONFIG_SGI_IP27 - /* Barrier on last store */ - writel(PCI64_ATTR_BAR >> 32, ®s->erbar); -#else - /* Let PCI API get it right */ - writel(0, ®s->erbar); -#endif + writel(ERBAR_VAL, ®s->erbar); readl(®s->etcdc); /* Clear on read */ writel(15, ®s->ercsr); /* RX low watermark */ writel(0, ®s->ertr); /* Interrupt immediately */ @@ -881,13 +931,13 @@ static void ioc3_start(struct ioc3_private *ip) unsigned long ring; /* Now the rx ring base, consume & produce registers. */ - ring = ioc3_map(ip->rxr, 0); + ring = ioc3_map(ip->rxr_dma, PCI64_ATTR_PREC); writel(ring >> 32, ®s->erbr_h); writel(ring & 0xffffffff, ®s->erbr_l); writel(ip->rx_ci << 3, ®s->ercir); writel((ip->rx_pi << 3) | ERPIR_ARM, ®s->erpir); - ring = ioc3_map(ip->txr, 0); + ring = ioc3_map(ip->txr_dma, PCI64_ATTR_PREC); ip->txqlen = 0; /* nothing queued */ @@ -1161,6 +1211,7 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent) ip = netdev_priv(dev); ip->dev = dev; + ip->dma_dev = &pdev->dev; dev->irq = pdev->irq; @@ -1187,7 +1238,8 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent) ioc3_stop(ip); /* Allocate rx ring. 4kb = 512 entries, must be 4kb aligned */ - ip->rxr = (unsigned long *)get_zeroed_page(GFP_KERNEL); + ip->rxr = dma_direct_alloc_pages(ip->dma_dev, RX_RING_SIZE, + &ip->rxr_dma, GFP_ATOMIC, 0); if (!ip->rxr) { pr_err("ioc3-eth: rx ring allocation failed\n"); err = -ENOMEM; @@ -1195,7 +1247,9 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent) } /* Allocate tx rings. 16kb = 128 bufs, must be 16kb aligned */ - ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2); + ip->txr = dma_direct_alloc_pages(ip->dma_dev, TX_RING_SIZE, + &ip->txr_dma, + GFP_KERNEL | __GFP_ZERO, 0); if (!ip->txr) { pr_err("ioc3-eth: tx ring allocation failed\n"); err = -ENOMEM; @@ -1255,9 +1309,11 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent) out_stop: del_timer_sync(&ip->ioc3_timer); if (ip->rxr) - free_page((unsigned long)ip->rxr); + dma_direct_free_pages(ip->dma_dev, RX_RING_SIZE, ip->rxr, + ip->rxr_dma, 0); if (ip->txr) - free_pages((unsigned long)ip->txr, 2); + dma_direct_free_pages(ip->dma_dev, TX_RING_SIZE, ip->txr, + ip->txr_dma, 0); out_res: pci_release_regions(pdev); out_free: @@ -1275,8 +1331,10 @@ static void ioc3_remove_one(struct pci_dev *pdev) struct net_device *dev = pci_get_drvdata(pdev); struct ioc3_private *ip = netdev_priv(dev); - free_page((unsigned long)ip->rxr); - free_pages((unsigned long)ip->txr, 2); + dma_direct_free_pages(ip->dma_dev, RX_RING_SIZE, ip->rxr, + ip->rxr_dma, 0); + dma_direct_free_pages(ip->dma_dev, TX_RING_SIZE, ip->txr, + ip->txr_dma, 0); unregister_netdev(dev); del_timer_sync(&ip->ioc3_timer); @@ -1382,18 +1440,32 @@ static netdev_tx_t ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev) unsigned long b2 = (data | 0x3fffUL) + 1UL; unsigned long s1 = b2 - data; unsigned long s2 = data + len - b2; + dma_addr_t d1, d2; desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_B1V | ETXD_B2V | w0); desc->bufcnt = cpu_to_be32((s1 << ETXD_B1CNT_SHIFT) | (s2 << ETXD_B2CNT_SHIFT)); - desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1)); - desc->p2 = cpu_to_be64(ioc3_map((void *)b2, 1)); + d1 = dma_map_single(ip->dma_dev, skb->data, s1, DMA_TO_DEVICE); + if (dma_mapping_error(ip->dma_dev, d1)) + goto drop_packet; + d2 = dma_map_single(ip->dma_dev, (void *)b2, s1, DMA_TO_DEVICE); + if (dma_mapping_error(ip->dma_dev, d2)) { + dma_unmap_single(ip->dma_dev, d1, len, DMA_TO_DEVICE); + goto drop_packet; + } + desc->p1 = cpu_to_be64(ioc3_map(d1, PCI64_ATTR_PREF)); + desc->p2 = cpu_to_be64(ioc3_map(d2, PCI64_ATTR_PREF)); } else { + dma_addr_t d; + /* Normal sized packet that doesn't cross a page boundary. */ desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_B1V | w0); desc->bufcnt = cpu_to_be32(len << ETXD_B1CNT_SHIFT); - desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1)); + d = dma_map_single(ip->dma_dev, skb->data, len, DMA_TO_DEVICE); + if (dma_mapping_error(ip->dma_dev, d)) + goto drop_packet; + desc->p1 = cpu_to_be64(ioc3_map(d, PCI64_ATTR_PREF)); } mb(); /* make sure all descriptor changes are visible */ @@ -1411,6 +1483,14 @@ static netdev_tx_t ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev) spin_unlock_irq(&ip->ioc3_lock); return NETDEV_TX_OK; + +drop_packet: + dev_kfree_skb_any(skb); + dev->stats.tx_dropped++; + + spin_unlock_irq(&ip->ioc3_lock); + + return NETDEV_TX_OK; } static void ioc3_timeout(struct net_device *dev) |