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net: axienet: Fix casting of pointers to u32

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This driver was casting skb pointers to u32 and storing them as such in
the DMA buffer descriptor, which is obviously broken on 64-bit. The area
of the buffer descriptor being used is not accessed by the hardware and
has sufficient room for a 32 or 64-bit pointer, so just store the skb
pointer as such.

Signed-off-by: Robert Hancock <hancock@sedsystems.ca>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Hancock 2019-06-06 16:28:05 -06:00 committed by David S. Miller
parent 40ae25505f
commit 23e6b2dc93
2 changed files with 17 additions and 20 deletions
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11
drivers/net/ethernet/xilinx/xilinx_axienet.h
View file

@ -356,9 +356,6 @@
* @app2: MM2S/S2MM User Application Field 2.
* @app3: MM2S/S2MM User Application Field 3.
* @app4: MM2S/S2MM User Application Field 4.
* @sw_id_offset: MM2S/S2MM Sw ID
* @reserved5: Reserved and not used
* @reserved6: Reserved and not used
*/
struct axidma_bd {
u32 next; /* Physical address of next buffer descriptor */
@ -373,11 +370,9 @@ struct axidma_bd {
u32 app1; /* TX start << 16 | insert */
u32 app2; /* TX csum seed */
u32 app3;
u32 app4;
u32 sw_id_offset;
u32 reserved5;
u32 reserved6;
};
u32 app4; /* Last field used by HW */
struct sk_buff *skb;
} __aligned(XAXIDMA_BD_MINIMUM_ALIGNMENT);
/**
* struct axienet_local - axienet private per device data

26
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
View file

@ -159,8 +159,7 @@ static void axienet_dma_bd_release(struct net_device *ndev)
for (i = 0; i < RX_BD_NUM; i++) {
dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
lp->max_frm_size, DMA_FROM_DEVICE);
dev_kfree_skb((struct sk_buff *)
(lp->rx_bd_v[i].sw_id_offset));
dev_kfree_skb(lp->rx_bd_v[i].skb);
}
if (lp->rx_bd_v) {
@ -227,7 +226,7 @@ static int axienet_dma_bd_init(struct net_device *ndev)
if (!skb)
goto out;
lp->rx_bd_v[i].sw_id_offset = (u32) skb;
lp->rx_bd_v[i].skb = skb;
lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
skb->data,
lp->max_frm_size,
@ -595,14 +594,15 @@ static void axienet_start_xmit_done(struct net_device *ndev)
dma_unmap_single(ndev->dev.parent, cur_p->phys,
(cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
DMA_TO_DEVICE);
if (cur_p->app4)
dev_consume_skb_irq((struct sk_buff *)cur_p->app4);
if (cur_p->skb)
dev_consume_skb_irq(cur_p->skb);
/*cur_p->phys = 0;*/
cur_p->app0 = 0;
cur_p->app1 = 0;
cur_p->app2 = 0;
cur_p->app4 = 0;
cur_p->status = 0;
cur_p->skb = NULL;
size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
packets++;
@ -707,7 +707,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
}
cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
cur_p->app4 = (unsigned long)skb;
cur_p->skb = skb;
tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
/* Start the transfer */
@ -742,13 +742,15 @@ static void axienet_recv(struct net_device *ndev)
while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
skb = (struct sk_buff *) (cur_p->sw_id_offset);
length = cur_p->app4 & 0x0000FFFF;
dma_unmap_single(ndev->dev.parent, cur_p->phys,
lp->max_frm_size,
DMA_FROM_DEVICE);
skb = cur_p->skb;
cur_p->skb = NULL;
length = cur_p->app4 & 0x0000FFFF;
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, ndev);
/*skb_checksum_none_assert(skb);*/
@ -783,7 +785,7 @@ static void axienet_recv(struct net_device *ndev)
DMA_FROM_DEVICE);
cur_p->cntrl = lp->max_frm_size;
cur_p->status = 0;
cur_p->sw_id_offset = (u32) new_skb;
cur_p->skb = new_skb;
++lp->rx_bd_ci;
lp->rx_bd_ci %= RX_BD_NUM;
@ -1343,8 +1345,8 @@ static void axienet_dma_err_handler(unsigned long data)
(cur_p->cntrl &
XAXIDMA_BD_CTRL_LENGTH_MASK),
DMA_TO_DEVICE);
if (cur_p->app4)
dev_kfree_skb_irq((struct sk_buff *) cur_p->app4);
if (cur_p->skb)
dev_kfree_skb_irq(cur_p->skb);
cur_p->phys = 0;
cur_p->cntrl = 0;
cur_p->status = 0;
@ -1353,7 +1355,7 @@ static void axienet_dma_err_handler(unsigned long data)
cur_p->app2 = 0;
cur_p->app3 = 0;
cur_p->app4 = 0;
cur_p->sw_id_offset = 0;
cur_p->skb = NULL;
}
for (i = 0; i < RX_BD_NUM; i++) {