Currently, the code pulls out the length field when
unmapping a buffer directly from the descriptor. This will result
in an uncached read to a dma_alloc_coherent() region. There is no
need to do this, so this patch simply puts the value directly into
a data structure which will hit the cache.
Signed-off-by: Fabrice Gasnier <fabrice.gasn...@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavall...@st.com>
---
drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 3 +++
drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 5 +++++
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 +++++++----
4 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
index 399a7ed..688795e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
@@ -50,6 +50,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
if (dma_mapping_error(priv->device, desc->des2))
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = bmax;
priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_CHAIN_MODE);
while (len != 0) {
@@ -65,6 +66,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
if (dma_mapping_error(priv->device, desc->des2))
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = bmax;
priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,
STMMAC_CHAIN_MODE);
priv->hw->desc->set_tx_owner(desc);
@@ -77,6 +79,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
if (dma_mapping_error(priv->device, desc->des2))
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = len;
priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
STMMAC_CHAIN_MODE);
priv->hw->desc->set_tx_owner(desc);
diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
index 2560855..3300029 100644
--- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
@@ -57,6 +57,8 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = bmax;
+
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum,
STMMAC_RING_MODE);
@@ -75,6 +77,8 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
if (dma_mapping_error(priv->device, desc->des2))
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = len;
+
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
STMMAC_RING_MODE);
@@ -86,6 +90,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int
csum)
if (dma_mapping_error(priv->device, desc->des2))
return -1;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = nopaged_len;
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum,
STMMAC_RING_MODE);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 1f3b33a..8517a04 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -45,6 +45,7 @@ struct stmmac_resources {
struct stmmac_tx_info {
dma_addr_t buf;
bool map_as_page;
+ unsigned len;
};
struct stmmac_priv {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 366da1f..f9baf5d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1110,6 +1110,7 @@ static int init_dma_desc_rings(struct net_device *dev,
gfp_t flags)
p->des2 = 0;
priv->tx_skbuff_dma[i].buf = 0;
priv->tx_skbuff_dma[i].map_as_page = false;
+ priv->tx_skbuff_dma[i].len = 0;
priv->tx_skbuff[i] = NULL;
}
@@ -1153,12 +1154,12 @@ static void dma_free_tx_skbufs(struct stmmac_priv *priv)
if (priv->tx_skbuff_dma[i].map_as_page)
dma_unmap_page(priv->device,
priv->tx_skbuff_dma[i].buf,
- priv->hw->desc->get_tx_len(p),
+ priv->tx_skbuff_dma[i].len,
DMA_TO_DEVICE);
else
dma_unmap_single(priv->device,
priv->tx_skbuff_dma[i].buf,
- priv->hw->desc->get_tx_len(p),
+ priv->tx_skbuff_dma[i].len,
DMA_TO_DEVICE);
}
@@ -1367,12 +1368,12 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
if (priv->tx_skbuff_dma[entry].map_as_page)
dma_unmap_page(priv->device,
priv->tx_skbuff_dma[entry].buf,
- priv->hw->desc->get_tx_len(p),
+ priv->tx_skbuff_dma[entry].len,
DMA_TO_DEVICE);
else
dma_unmap_single(priv->device,
priv->tx_skbuff_dma[entry].buf,
- priv->hw->desc->get_tx_len(p),
+ priv->tx_skbuff_dma[entry].len,
DMA_TO_DEVICE);
priv->tx_skbuff_dma[entry].buf = 0;
priv->tx_skbuff_dma[entry].map_as_page = false;
@@ -2012,6 +2013,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb,
struct net_device *dev)
if (dma_mapping_error(priv->device, desc->des2))
goto dma_map_err;
priv->tx_skbuff_dma[entry].buf = desc->des2;
+ priv->tx_skbuff_dma[entry].len = nopaged_len;
priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
csum_insertion, priv->mode);
} else {
@@ -2041,6 +2043,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb,
struct net_device *dev)
priv->tx_skbuff_dma[entry].buf = desc->des2;
priv->tx_skbuff_dma[entry].map_as_page = true;
+ priv->tx_skbuff_dma[entry].len = len;
priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion,
priv->mode);
wmb();
--
1.7.4.4
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