| Message ID | 20190711052427.5582-2-jian-hong@endlessm.com |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | David Miller |
| Headers | show |
| Series | [v4,1/2] rtw88: pci: Rearrange the memory usage for skb in RX ISR | expand |
Jian-Hong Pan <jian-hong@endlessm.com> 於 2019年7月11日 週四 下午1:25寫道： > > Since each skb in RX ring is reused instead of new allocation, we can > treat the DMA in a more efficient way by DMA synchronization. > > Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com> > Cc: <stable@vger.kernel.org> > --- Sorry, also forget to place the version difference here v2: - New patch by following [PATCH v3 1/2] rtw88: pci: Rearrange the memory usage for skb in RX ISR. v3: - Remove rtw_pci_sync_rx_desc_cpu and call dma_sync_single_for_cpu in rtw_pci_rx_isr directly. - Remove the return value of rtw_pci_sync_rx_desc_device. - Use DMA_FROM_DEVICE instead of PCI_DMA_FROMDEVICE. v4: - Same as v3. > drivers/net/wireless/realtek/rtw88/pci.c | 24 +++++++++++++++++++++--- > 1 file changed, 21 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c > index c415f5e94fed..68fae52151dd 100644 > --- a/drivers/net/wireless/realtek/rtw88/pci.c > +++ b/drivers/net/wireless/realtek/rtw88/pci.c > @@ -206,6 +206,23 @@ static int rtw_pci_reset_rx_desc(struct rtw_dev *rtwdev, struct sk_buff *skb, > return 0; > } > > +static void rtw_pci_sync_rx_desc_device(struct rtw_dev *rtwdev, dma_addr_t dma, > + struct rtw_pci_rx_ring *rx_ring, > + u32 idx, u32 desc_sz) > +{ > + struct device *dev = rtwdev->dev; > + struct rtw_pci_rx_buffer_desc *buf_desc; > + int buf_sz = RTK_PCI_RX_BUF_SIZE; > + > + dma_sync_single_for_device(dev, dma, buf_sz, DMA_FROM_DEVICE); > + > + buf_desc = (struct rtw_pci_rx_buffer_desc *)(rx_ring->r.head + > + idx * desc_sz); > + memset(buf_desc, 0, sizeof(*buf_desc)); > + buf_desc->buf_size = cpu_to_le16(RTK_PCI_RX_BUF_SIZE); > + buf_desc->dma = cpu_to_le32(dma); > +} > + > static int rtw_pci_init_rx_ring(struct rtw_dev *rtwdev, > struct rtw_pci_rx_ring *rx_ring, > u8 desc_size, u32 len) > @@ -782,8 +799,8 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci, > rtw_pci_dma_check(rtwdev, ring, cur_rp); > skb = ring->buf[cur_rp]; > dma = *((dma_addr_t *)skb->cb); > - pci_unmap_single(rtwpci->pdev, dma, RTK_PCI_RX_BUF_SIZE, > - PCI_DMA_FROMDEVICE); > + dma_sync_single_for_cpu(rtwdev->dev, dma, RTK_PCI_RX_BUF_SIZE, > + DMA_FROM_DEVICE); > rx_desc = skb->data; > chip->ops->query_rx_desc(rtwdev, rx_desc, &pkt_stat, &rx_status); > > @@ -818,7 +835,8 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci, > > next_rp: > /* new skb delivered to mac80211, re-enable original skb DMA */ > - rtw_pci_reset_rx_desc(rtwdev, skb, ring, cur_rp, buf_desc_sz); > + rtw_pci_sync_rx_desc_device(rtwdev, dma, ring, cur_rp, > + buf_desc_sz); > > /* host read next element in ring */ > if (++cur_rp >= ring->r.len) > -- > 2.22.0 >
diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c index c415f5e94fed..68fae52151dd 100644 --- a/drivers/net/wireless/realtek/rtw88/pci.c +++ b/drivers/net/wireless/realtek/rtw88/pci.c @@ -206,6 +206,23 @@ static int rtw_pci_reset_rx_desc(struct rtw_dev *rtwdev, struct sk_buff *skb, return 0; } +static void rtw_pci_sync_rx_desc_device(struct rtw_dev *rtwdev, dma_addr_t dma, + struct rtw_pci_rx_ring *rx_ring, + u32 idx, u32 desc_sz) +{ + struct device *dev = rtwdev->dev; + struct rtw_pci_rx_buffer_desc *buf_desc; + int buf_sz = RTK_PCI_RX_BUF_SIZE; + + dma_sync_single_for_device(dev, dma, buf_sz, DMA_FROM_DEVICE); + + buf_desc = (struct rtw_pci_rx_buffer_desc *)(rx_ring->r.head + + idx * desc_sz); + memset(buf_desc, 0, sizeof(*buf_desc)); + buf_desc->buf_size = cpu_to_le16(RTK_PCI_RX_BUF_SIZE); + buf_desc->dma = cpu_to_le32(dma); +} + static int rtw_pci_init_rx_ring(struct rtw_dev *rtwdev, struct rtw_pci_rx_ring *rx_ring, u8 desc_size, u32 len) @@ -782,8 +799,8 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci, rtw_pci_dma_check(rtwdev, ring, cur_rp); skb = ring->buf[cur_rp]; dma = *((dma_addr_t *)skb->cb); - pci_unmap_single(rtwpci->pdev, dma, RTK_PCI_RX_BUF_SIZE, - PCI_DMA_FROMDEVICE); + dma_sync_single_for_cpu(rtwdev->dev, dma, RTK_PCI_RX_BUF_SIZE, + DMA_FROM_DEVICE); rx_desc = skb->data; chip->ops->query_rx_desc(rtwdev, rx_desc, &pkt_stat, &rx_status); @@ -818,7 +835,8 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci, next_rp: /* new skb delivered to mac80211, re-enable original skb DMA */ - rtw_pci_reset_rx_desc(rtwdev, skb, ring, cur_rp, buf_desc_sz); + rtw_pci_sync_rx_desc_device(rtwdev, dma, ring, cur_rp, + buf_desc_sz); /* host read next element in ring */ if (++cur_rp >= ring->r.len)
Since each skb in RX ring is reused instead of new allocation, we can treat the DMA in a more efficient way by DMA synchronization. Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com> Cc: <stable@vger.kernel.org> --- drivers/net/wireless/realtek/rtw88/pci.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-)