UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

net/mlx5e: Use the right DMA free function on TX path 

On xmit path we use skb_frag_dma_map() which is using dma_map_page(),
while upon completion we dma-unmap the skb fragments using
dma_unmap_single() rather than dma_unmap_page().

To fix this, we now save the dma map type on xmit path and use this
info to call the right dma unmap method upon TX completion.

Signed-off-by: Achiad Shochat <achiad@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Achiad Shochat 2015-11-12 19:35:28 +02:00 committed by David S. Miller
parent 50a9eea694
commit d4e28cbd24
2 changed files with 45 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -334,9 +334,15 @@ struct mlx5e_tx_skb_cb {
#define MLX5E_TX_SKB_CB(__skb) ((struct mlx5e_tx_skb_cb *)__skb->cb)
enum mlx5e_dma_map_type {
MLX5E_DMA_MAP_SINGLE,
MLX5E_DMA_MAP_PAGE
};
struct mlx5e_sq_dma {
dma_addr_t addr;
u32 size;
dma_addr_t addr;
u32 size;
enum mlx5e_dma_map_type type;
};
enum {

69
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
View File

@ -61,41 +61,49 @@ void mlx5e_send_nop(struct mlx5e_sq *sq, bool notify_hw)
}
}
static void mlx5e_dma_pop_last_pushed(struct mlx5e_sq *sq, dma_addr_t *addr,
u32 *size)
static inline void mlx5e_tx_dma_unmap(struct device *pdev,
struct mlx5e_sq_dma *dma)
{
sq->dma_fifo_pc--;
*addr = sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr;
*size = sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size;
switch (dma->type) {
case MLX5E_DMA_MAP_SINGLE:
dma_unmap_single(pdev, dma->addr, dma->size, DMA_TO_DEVICE);
break;
case MLX5E_DMA_MAP_PAGE:
dma_unmap_page(pdev, dma->addr, dma->size, DMA_TO_DEVICE);
break;
default:
WARN_ONCE(true, "mlx5e_tx_dma_unmap unknown DMA type!\n");
}
}
static inline void mlx5e_dma_push(struct mlx5e_sq *sq,
dma_addr_t addr,
u32 size,
enum mlx5e_dma_map_type map_type)
{
sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr = addr;
sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size = size;
sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].type = map_type;
sq->dma_fifo_pc++;
}
static inline struct mlx5e_sq_dma *mlx5e_dma_get(struct mlx5e_sq *sq, u32 i)
{
return &sq->dma_fifo[i & sq->dma_fifo_mask];
}
static void mlx5e_dma_unmap_wqe_err(struct mlx5e_sq *sq, struct sk_buff *skb)
{
dma_addr_t addr;
u32 size;
int i;
for (i = 0; i < MLX5E_TX_SKB_CB(skb)->num_dma; i++) {
mlx5e_dma_pop_last_pushed(sq, &addr, &size);
dma_unmap_single(sq->pdev, addr, size, DMA_TO_DEVICE);
struct mlx5e_sq_dma *last_pushed_dma =
mlx5e_dma_get(sq, --sq->dma_fifo_pc);
mlx5e_tx_dma_unmap(sq->pdev, last_pushed_dma);
}
}
static inline void mlx5e_dma_push(struct mlx5e_sq *sq, dma_addr_t addr,
u32 size)
{
sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr = addr;
sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size = size;
sq->dma_fifo_pc++;
}
static inline void mlx5e_dma_get(struct mlx5e_sq *sq, u32 i, dma_addr_t *addr,
u32 *size)
{
*addr = sq->dma_fifo[i & sq->dma_fifo_mask].addr;
*size = sq->dma_fifo[i & sq->dma_fifo_mask].size;
}
u16 mlx5e_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
@ -225,7 +233,7 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *sq, struct sk_buff *skb)
dseg->lkey = sq->mkey_be;
dseg->byte_count = cpu_to_be32(headlen);
mlx5e_dma_push(sq, dma_addr, headlen);
mlx5e_dma_push(sq, dma_addr, headlen, MLX5E_DMA_MAP_SINGLE);
MLX5E_TX_SKB_CB(skb)->num_dma++;
dseg++;
@ -244,7 +252,7 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *sq, struct sk_buff *skb)
dseg->lkey = sq->mkey_be;
dseg->byte_count = cpu_to_be32(fsz);
mlx5e_dma_push(sq, dma_addr, fsz);
mlx5e_dma_push(sq, dma_addr, fsz, MLX5E_DMA_MAP_PAGE);
MLX5E_TX_SKB_CB(skb)->num_dma++;
dseg++;
@ -360,13 +368,10 @@ bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq)
}
for (j = 0; j < MLX5E_TX_SKB_CB(skb)->num_dma; j++) {
dma_addr_t addr;
u32 size;
struct mlx5e_sq_dma *dma =
mlx5e_dma_get(sq, dma_fifo_cc++);
mlx5e_dma_get(sq, dma_fifo_cc, &addr, &size);
dma_fifo_cc++;
dma_unmap_single(sq->pdev, addr, size,
DMA_TO_DEVICE);
mlx5e_tx_dma_unmap(sq->pdev, dma);
}
npkts++;