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authorFelix Fietkau <nbd@nbd.name>2018-06-06 09:56:13 +0200
committerFelix Fietkau <nbd@nbd.name>2018-06-19 09:45:28 +0200
commit9a4253b81f3b3fff833ef92737ef73ad4c455ade (patch)
tree9e97618bb14dcbab0b64d2a6ebcd893e1ed4fb29 /target/linux/ramips
parentc49ae68cbaf078a3dacaebf453d9e7ece2e861f5 (diff)
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ramips: improve ethernet driver performance with GRO/TSO
GRO stores packets as fraglist. If they are routed back to the ethernet device, they need to be re-segmented if the driver does not support sending fraglists. Add the missing support for that, along with a missing feature flag that allows full routed GRO->TSO offload. Considerably reduces CPU utilization for routing Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.c167
-rw-r--r--target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.h11
-rw-r--r--target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c3
3 files changed, 105 insertions, 76 deletions
diff --git a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index d298fa9a97..e68ca204ed 100644
--- a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -307,24 +307,20 @@ no_rx_mem:
static void fe_txd_unmap(struct device *dev, struct fe_tx_buf *tx_buf)
{
- if (tx_buf->flags & FE_TX_FLAGS_SINGLE0) {
- dma_unmap_single(dev,
- dma_unmap_addr(tx_buf, dma_addr0),
- dma_unmap_len(tx_buf, dma_len0),
- DMA_TO_DEVICE);
- } else if (tx_buf->flags & FE_TX_FLAGS_PAGE0) {
+ if (dma_unmap_len(tx_buf, dma_len0))
dma_unmap_page(dev,
dma_unmap_addr(tx_buf, dma_addr0),
dma_unmap_len(tx_buf, dma_len0),
DMA_TO_DEVICE);
- }
- if (tx_buf->flags & FE_TX_FLAGS_PAGE1)
+
+ if (dma_unmap_len(tx_buf, dma_len1))
dma_unmap_page(dev,
dma_unmap_addr(tx_buf, dma_addr1),
dma_unmap_len(tx_buf, dma_len1),
DMA_TO_DEVICE);
- tx_buf->flags = 0;
+ dma_unmap_len_set(tx_buf, dma_addr0, 0);
+ dma_unmap_len_set(tx_buf, dma_addr1, 0);
if (tx_buf->skb && (tx_buf->skb != (struct sk_buff *)DMA_DUMMY_DESC))
dev_kfree_skb_any(tx_buf->skb);
tx_buf->skb = NULL;
@@ -559,6 +555,54 @@ static inline u32 fe_empty_txd(struct fe_tx_ring *ring)
(ring->tx_ring_size - 1)));
}
+static int fe_tx_dma_map_page(struct device *dev, struct fe_tx_buf *tx_buf,
+ struct fe_tx_dma *txd, int idx,
+ struct page *page, size_t offset, size_t size)
+{
+ dma_addr_t mapped_addr;
+
+ mapped_addr = dma_map_page(dev, page, offset, size, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(dev, mapped_addr)))
+ return -EIO;
+
+ if (idx & 1) {
+ txd->txd3 = mapped_addr;
+ txd->txd2 |= TX_DMA_PLEN1(size);
+ dma_unmap_addr_set(tx_buf, dma_addr1, mapped_addr);
+ dma_unmap_len_set(tx_buf, dma_len1, size);
+ } else {
+ tx_buf->skb = (struct sk_buff *)DMA_DUMMY_DESC;
+ txd->txd1 = mapped_addr;
+ txd->txd2 = TX_DMA_PLEN0(size);
+ dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
+ dma_unmap_len_set(tx_buf, dma_len0, size);
+ }
+ return 0;
+}
+
+static int fe_tx_dma_map_skb(struct device *dev, struct fe_tx_buf *tx_buf,
+ struct fe_tx_dma *txd, int idx,
+ struct sk_buff *skb)
+{
+ struct page *page = virt_to_page(skb->data);
+ size_t offset = offset_in_page(skb->data);
+ size_t size = skb_headlen(skb);
+
+ return fe_tx_dma_map_page(dev, tx_buf, txd, idx, page, offset, size);
+}
+
+static inline struct sk_buff *
+fe_next_frag(struct sk_buff *head, struct sk_buff *skb)
+{
+ if (skb != head)
+ return skb->next;
+
+ if (skb_has_frag_list(skb))
+ return skb_shinfo(skb)->frag_list;
+
+ return NULL;
+}
+
static int fe_tx_map_dma(struct sk_buff *skb, struct net_device *dev,
int tx_num, struct fe_tx_ring *ring)
{
@@ -566,7 +610,7 @@ static int fe_tx_map_dma(struct sk_buff *skb, struct net_device *dev,
struct skb_frag_struct *frag;
struct fe_tx_dma txd, *ptxd;
struct fe_tx_buf *tx_buf;
- dma_addr_t mapped_addr;
+ struct sk_buff *head = skb;
unsigned int nr_frags;
u32 def_txd4;
int i, j, k, frag_size, frag_map_size, offset;
@@ -574,7 +618,6 @@ static int fe_tx_map_dma(struct sk_buff *skb, struct net_device *dev,
tx_buf = &ring->tx_buf[ring->tx_next_idx];
memset(tx_buf, 0, sizeof(*tx_buf));
memset(&txd, 0, sizeof(txd));
- nr_frags = skb_shinfo(skb)->nr_frags;
/* init tx descriptor */
if (priv->soc->tx_dma)
@@ -613,82 +656,68 @@ static int fe_tx_map_dma(struct sk_buff *skb, struct net_device *dev,
}
}
- mapped_addr = dma_map_single(&dev->dev, skb->data,
- skb_headlen(skb), DMA_TO_DEVICE);
- if (unlikely(dma_mapping_error(&dev->dev, mapped_addr)))
- goto err_out;
- txd.txd1 = mapped_addr;
- txd.txd2 = TX_DMA_PLEN0(skb_headlen(skb));
+ k = 0;
+ j = ring->tx_next_idx;
- tx_buf->flags |= FE_TX_FLAGS_SINGLE0;
- dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
- dma_unmap_len_set(tx_buf, dma_len0, skb_headlen(skb));
+next_frag:
+ if (skb_headlen(skb)) {
+ if (fe_tx_dma_map_skb(&dev->dev, tx_buf, &txd, k++, skb))
+ goto err_dma;
+ }
/* TX SG offload */
- j = ring->tx_next_idx;
- k = 0;
+ nr_frags = skb_shinfo(skb)->nr_frags;
for (i = 0; i < nr_frags; i++) {
- offset = 0;
+ struct page *page;
+
frag = &skb_shinfo(skb)->frags[i];
frag_size = skb_frag_size(frag);
+ offset = frag->page_offset;
+ page = skb_frag_page(frag);
while (frag_size > 0) {
frag_map_size = min(frag_size, TX_DMA_BUF_LEN);
- mapped_addr = skb_frag_dma_map(&dev->dev, frag, offset,
- frag_map_size,
- DMA_TO_DEVICE);
- if (unlikely(dma_mapping_error(&dev->dev, mapped_addr)))
- goto err_dma;
-
- if (k & 0x1) {
- j = NEXT_TX_DESP_IDX(j);
- txd.txd1 = mapped_addr;
- txd.txd2 = TX_DMA_PLEN0(frag_map_size);
+ if (!(k & 0x1)) {
+ fe_set_txd(&txd, &ring->tx_dma[j]);
+ memset(&txd, 0, sizeof(txd));
txd.txd4 = def_txd4;
-
+ j = NEXT_TX_DESP_IDX(j);
tx_buf = &ring->tx_buf[j];
- memset(tx_buf, 0, sizeof(*tx_buf));
-
- tx_buf->flags |= FE_TX_FLAGS_PAGE0;
- dma_unmap_addr_set(tx_buf, dma_addr0,
- mapped_addr);
- dma_unmap_len_set(tx_buf, dma_len0,
- frag_map_size);
- } else {
- txd.txd3 = mapped_addr;
- txd.txd2 |= TX_DMA_PLEN1(frag_map_size);
-
- tx_buf->skb = (struct sk_buff *)DMA_DUMMY_DESC;
- tx_buf->flags |= FE_TX_FLAGS_PAGE1;
- dma_unmap_addr_set(tx_buf, dma_addr1,
- mapped_addr);
- dma_unmap_len_set(tx_buf, dma_len1,
- frag_map_size);
-
- if (!((i == (nr_frags - 1)) &&
- (frag_map_size == frag_size))) {
- fe_set_txd(&txd, &ring->tx_dma[j]);
- memset(&txd, 0, sizeof(txd));
- }
}
+
+ if (fe_tx_dma_map_page(&dev->dev, tx_buf, &txd, k++,
+ page, offset, frag_map_size))
+ goto err_dma;
+
frag_size -= frag_map_size;
offset += frag_map_size;
- k++;
}
}
+ skb = fe_next_frag(head, skb);
+ if (skb) {
+ if (!(k & 0x1)) {
+ fe_set_txd(&txd, &ring->tx_dma[j]);
+ memset(&txd, 0, sizeof(txd));
+ txd.txd4 = def_txd4;
+ j = NEXT_TX_DESP_IDX(j);
+ tx_buf = &ring->tx_buf[j];
+ }
+ goto next_frag;
+ }
+
/* set last segment */
if (k & 0x1)
- txd.txd2 |= TX_DMA_LS1;
- else
txd.txd2 |= TX_DMA_LS0;
+ else
+ txd.txd2 |= TX_DMA_LS1;
fe_set_txd(&txd, &ring->tx_dma[j]);
/* store skb to cleanup */
- tx_buf->skb = skb;
+ tx_buf->skb = head;
- netdev_sent_queue(dev, skb->len);
- skb_tx_timestamp(skb);
+ netdev_sent_queue(dev, head->len);
+ skb_tx_timestamp(head);
ring->tx_next_idx = NEXT_TX_DESP_IDX(j);
/* make sure that all changes to the dma ring are flushed before we
@@ -702,7 +731,7 @@ static int fe_tx_map_dma(struct sk_buff *skb, struct net_device *dev,
netif_wake_queue(dev);
}
- if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)) || !skb->xmit_more)
+ if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)) || !head->xmit_more)
fe_reg_w32(ring->tx_next_idx, FE_REG_TX_CTX_IDX0);
return 0;
@@ -762,10 +791,12 @@ static inline int fe_skb_padto(struct sk_buff *skb, struct fe_priv *priv)
static inline int fe_cal_txd_req(struct sk_buff *skb)
{
- int i, nfrags;
+ struct sk_buff *head = skb;
+ int i, nfrags = 0;
struct skb_frag_struct *frag;
- nfrags = 1;
+next_frag:
+ nfrags++;
if (skb_is_gso(skb)) {
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
frag = &skb_shinfo(skb)->frags[i];
@@ -775,6 +806,10 @@ static inline int fe_cal_txd_req(struct sk_buff *skb)
nfrags += skb_shinfo(skb)->nr_frags;
}
+ skb = fe_next_frag(head, skb);
+ if (skb)
+ goto next_frag;
+
return DIV_ROUND_UP(nfrags, 2);
}
diff --git a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index dfaa5fd9ea..517d8ba4dc 100644
--- a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -435,19 +435,12 @@ struct fe_hw_stats {
#undef _FE
};
-enum fe_tx_flags {
- FE_TX_FLAGS_SINGLE0 = 0x01,
- FE_TX_FLAGS_PAGE0 = 0x02,
- FE_TX_FLAGS_PAGE1 = 0x04,
-};
-
struct fe_tx_buf {
struct sk_buff *skb;
- u32 flags;
DEFINE_DMA_UNMAP_ADDR(dma_addr0);
- DEFINE_DMA_UNMAP_LEN(dma_len0);
DEFINE_DMA_UNMAP_ADDR(dma_addr1);
- DEFINE_DMA_UNMAP_LEN(dma_len1);
+ u16 dma_len0;
+ u16 dma_len1;
};
struct fe_tx_ring {
diff --git a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
index 00dd45e01f..96d3909a48 100644
--- a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
+++ b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
@@ -143,7 +143,8 @@ static void mt7621_init_data(struct fe_soc_data *data,
netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_TSO |
- NETIF_F_TSO6 | NETIF_F_IPV6_CSUM;
+ NETIF_F_TSO6 | NETIF_F_IPV6_CSUM | NETIF_F_FRAGLIST |
+ NETIF_F_TSO_MANGLEID;
}
static void mt7621_set_mac(struct fe_priv *priv, unsigned char *mac)