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net/faraday: Separate rx page storage from rxdesc 

The ftgmac100 hardware revision in e.g. the Aspeed AST2500 no longer
reserves all bits in RXDES#2 but instead uses the bottom 16 bits to
store MAC frame metadata. Avoid corruption by shifting struct page
pointers out to their own member in struct ftgmac100.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Jeffery 2016-09-22 08:34:58 +09:30 committed by David S. Miller
parent 524605e5ba
commit ada66b54c4
1 changed files with 18 additions and 7 deletions
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25
drivers/net/ethernet/faraday/ftgmac100.c
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@ -60,6 +60,8 @@ struct ftgmac100 {
struct ftgmac100_descs *descs;
dma_addr_t descs_dma_addr;
struct page *rx_pages[RX_QUEUE_ENTRIES];
unsigned int rx_pointer;
unsigned int tx_clean_pointer;
unsigned int tx_pointer;
@ -341,18 +343,27 @@ static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
}
static inline struct page **ftgmac100_rxdes_page_slot(struct ftgmac100 *priv,
struct ftgmac100_rxdes *rxdes)
{
return &priv->rx_pages[rxdes - priv->descs->rxdes];
}
/*
* rxdes2 is not used by hardware. We use it to keep track of page.
* Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
*/
static void ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page)
static void ftgmac100_rxdes_set_page(struct ftgmac100 *priv,
struct ftgmac100_rxdes *rxdes,
struct page *page)
{
rxdes->rxdes2 = (unsigned int)page;
*ftgmac100_rxdes_page_slot(priv, rxdes) = page;
}
static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes)
static struct page *ftgmac100_rxdes_get_page(struct ftgmac100 *priv,
struct ftgmac100_rxdes *rxdes)
{
return (struct page *)rxdes->rxdes2;
return *ftgmac100_rxdes_page_slot(priv, rxdes);
}
/******************************************************************************
@ -501,7 +512,7 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
do {
dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
struct page *page = ftgmac100_rxdes_get_page(rxdes);
struct page *page = ftgmac100_rxdes_get_page(priv, rxdes);
unsigned int size;
dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
@ -779,7 +790,7 @@ static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
return -ENOMEM;
}
ftgmac100_rxdes_set_page(rxdes, page);
ftgmac100_rxdes_set_page(priv, rxdes, page);
ftgmac100_rxdes_set_dma_addr(rxdes, map);
ftgmac100_rxdes_set_dma_own(rxdes);
return 0;
@ -791,7 +802,7 @@ static void ftgmac100_free_buffers(struct ftgmac100 *priv)
for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
struct page *page = ftgmac100_rxdes_get_page(rxdes);
struct page *page = ftgmac100_rxdes_get_page(priv, rxdes);
dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
if (!page)