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net: mvpp2: fix buffers' DMA handling on RX path 

Each allocated buffer, whose pointer is put into BM pool is DMA-mapped.
Hence it should be properly unmapped after usage or when removing buffers
from pool.

This commit fixes DMA handling on RX path by adding dma_unmap_single() in
mvpp2_rx() and in mvpp2_bufs_free(). The latter function's argument number
had to be increased for this purpose.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>

Fixes: 3f518509de ("ethernet: Add new driver for Marvell Armada 375
network unit")

Cc: <stable@vger.kernel.org> # v3.18+
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Marcin Wojtas 2015-12-03 15:20:50 +01:00 committed by David S. Miller
parent e864b4c7b1
commit 4229d502ad
1 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/ethernet/marvell/mvpp2.c
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@ -3413,16 +3413,23 @@ static void mvpp2_bm_pool_bufsize_set(struct mvpp2 *priv,
}
/* Free all buffers from the pool */
static void mvpp2_bm_bufs_free(struct mvpp2 *priv, struct mvpp2_bm_pool *bm_pool)
static void mvpp2_bm_bufs_free(struct device *dev, struct mvpp2 *priv,
struct mvpp2_bm_pool *bm_pool)
{
int i;
for (i = 0; i < bm_pool->buf_num; i++) {
dma_addr_t buf_phys_addr;
u32 vaddr;
/* Get buffer virtual address (indirect access) */
mvpp2_read(priv, MVPP2_BM_PHY_ALLOC_REG(bm_pool->id));
buf_phys_addr = mvpp2_read(priv,
MVPP2_BM_PHY_ALLOC_REG(bm_pool->id));
vaddr = mvpp2_read(priv, MVPP2_BM_VIRT_ALLOC_REG);
dma_unmap_single(dev, buf_phys_addr,
bm_pool->buf_size, DMA_FROM_DEVICE);
if (!vaddr)
break;
dev_kfree_skb_any((struct sk_buff *)vaddr);
@ -3439,7 +3446,7 @@ static int mvpp2_bm_pool_destroy(struct platform_device *pdev,
{
u32 val;
mvpp2_bm_bufs_free(priv, bm_pool);
mvpp2_bm_bufs_free(&pdev->dev, priv, bm_pool);
if (bm_pool->buf_num) {
WARN(1, "cannot free all buffers in pool %d\n", bm_pool->id);
return 0;
@ -3692,7 +3699,8 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, enum mvpp2_bm_type type,
MVPP2_BM_LONG_BUF_NUM :
MVPP2_BM_SHORT_BUF_NUM;
else
mvpp2_bm_bufs_free(port->priv, new_pool);
mvpp2_bm_bufs_free(port->dev->dev.parent,
port->priv, new_pool);
new_pool->pkt_size = pkt_size;
@ -3756,7 +3764,7 @@ static int mvpp2_bm_update_mtu(struct net_device *dev, int mtu)
int pkt_size = MVPP2_RX_PKT_SIZE(mtu);
/* Update BM pool with new buffer size */
mvpp2_bm_bufs_free(port->priv, port_pool);
mvpp2_bm_bufs_free(dev->dev.parent, port->priv, port_pool);
if (port_pool->buf_num) {
WARN(1, "cannot free all buffers in pool %d\n", port_pool->id);
return -EIO;
@ -5136,6 +5144,9 @@ static int mvpp2_rx(struct mvpp2_port *port, int rx_todo,
skb = (struct sk_buff *)rx_desc->buf_cookie;
dma_unmap_single(dev->dev.parent, rx_desc->buf_phys_addr,
bm_pool->buf_size, DMA_FROM_DEVICE);
rcvd_pkts++;
rcvd_bytes += rx_bytes;
atomic_inc(&bm_pool->in_use);