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net: ll_temac: Fix support for 64-bit platforms 

The use of buffer descriptor APP4 field (32-bit) for storing skb pointer
obviously does not work on 64-bit platforms.
As APP3 is also unused, we can use that to store the other half of 64-bit
pointer values.

Contrary to what is hinted at in commit message of commit 15bfe05c8d
("net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit")
there are no other pointers stored in cdmac_bd.

Signed-off-by: Esben Haabendal <esben@geanix.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Esben Haabendal 2019-04-30 09:17:50 +02:00 committed by David S. Miller
parent 8425c41d1e
commit d84aec4215
2 changed files with 32 additions and 4 deletions
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1
drivers/net/ethernet/xilinx/Kconfig
View File

@ -34,7 +34,6 @@ config XILINX_AXI_EMAC
config XILINX_LL_TEMAC
tristate "Xilinx LL TEMAC (LocalLink Tri-mode Ethernet MAC) driver"
depends on (PPC || MICROBLAZE)
depends on !64BIT || BROKEN
select PHYLIB
---help---
This driver supports the Xilinx 10/100/1000 LocalLink TEMAC

35
drivers/net/ethernet/xilinx/ll_temac_main.c
View File

@ -619,11 +619,39 @@ static void temac_adjust_link(struct net_device *ndev)
mutex_unlock(&lp->indirect_mutex);
}
#ifdef CONFIG_64BIT
void ptr_to_txbd(void *p, struct cdmac_bd *bd)
{
bd->app3 = (u32)(((u64)p) >> 32);
bd->app4 = (u32)((u64)p & 0xFFFFFFFF);
}
void *ptr_from_txbd(struct cdmac_bd *bd)
{
return (void *)(((u64)(bd->app3) << 32) | bd->app4);
}
#else
void ptr_to_txbd(void *p, struct cmdac_bd *bd)
{
bd->app4 = (u32)p;
}
void *ptr_from_txbd(struct cdmac_bd *bd)
{
return (void *)(bd->app4);
}
#endif
static void temac_start_xmit_done(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct cdmac_bd *cur_p;
unsigned int stat = 0;
struct sk_buff *skb;
cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
stat = cur_p->app0;
@ -631,8 +659,9 @@ static void temac_start_xmit_done(struct net_device *ndev)
while (stat & STS_CTRL_APP0_CMPLT) {
dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
DMA_TO_DEVICE);
if (cur_p->app4)
dev_consume_skb_irq((struct sk_buff *)cur_p->app4);
skb = (struct sk_buff *)ptr_from_txbd(cur_p);
if (skb)
dev_consume_skb_irq(skb);
cur_p->app0 = 0;
cur_p->app1 = 0;
cur_p->app2 = 0;
@ -711,7 +740,7 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
cur_p->len = skb_headlen(skb);
cur_p->phys = dma_map_single(ndev->dev.parent, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
cur_p->app4 = (unsigned long)skb;
ptr_to_txbd((void *)skb, cur_p);
for (ii = 0; ii < num_frag; ii++) {
lp->tx_bd_tail++;