diff options
| author |   Felix Fietkau <nbd@nbd.name> | 2021-04-22 22:21:03 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-04-23 13:31:58 -0700 |
| commit | 4e6bf609569c59b6bd6acf4a607c096cbd820d79 (patch) | |
| tree | d7b6e993b68b1a25fbd2b952d0d9cea1f424356f /drivers/net/ethernet/mediatek | |
| parent | net: ethernet: mtk_eth_soc: implement dynamic interrupt moderation (diff) | |
| download | linux-dev-4e6bf609569c59b6bd6acf4a607c096cbd820d79.tar.xz linux-dev-4e6bf609569c59b6bd6acf4a607c096cbd820d79.zip | |
net: ethernet: mtk_eth_soc: cache HW pointer of last freed TX descriptor
The value is only updated by the CPU, so it is cheaper to access from the
ring data structure than from a hardware register.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mediatek')
| -rw-r--r-- | drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 | ||||
| -rw-r--r-- | drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 |
2 files changed, 6 insertions, 4 deletions
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 762e985fa294..6d23118b7a6c 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1364,7 +1364,7 @@ static int mtk_poll_tx_qdma(struct mtk_eth *eth, int budget, struct mtk_tx_buf *tx_buf; u32 cpu, dma; - cpu = mtk_r32(eth, MTK_QTX_CRX_PTR); + cpu = ring->last_free_ptr; dma = mtk_r32(eth, MTK_QTX_DRX_PTR); desc = mtk_qdma_phys_to_virt(ring, cpu); @@ -1398,6 +1398,7 @@ static int mtk_poll_tx_qdma(struct mtk_eth *eth, int budget, cpu = next_cpu; } + ring->last_free_ptr = cpu; mtk_w32(eth, cpu, MTK_QTX_CRX_PTR); return budget; @@ -1598,6 +1599,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth) atomic_set(&ring->free_count, MTK_DMA_SIZE - 2); ring->next_free = &ring->dma[0]; ring->last_free = &ring->dma[MTK_DMA_SIZE - 1]; + ring->last_free_ptr = (u32)(ring->phys + ((MTK_DMA_SIZE - 1) * sz)); ring->thresh = MAX_SKB_FRAGS; /* make sure that all changes to the dma ring are flushed before we @@ -1611,9 +1613,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth) mtk_w32(eth, ring->phys + ((MTK_DMA_SIZE - 1) * sz), MTK_QTX_CRX_PTR); - mtk_w32(eth, - ring->phys + ((MTK_DMA_SIZE - 1) * sz), - MTK_QTX_DRX_PTR); + mtk_w32(eth, ring->last_free_ptr, MTK_QTX_DRX_PTR); mtk_w32(eth, (QDMA_RES_THRES << 8) | QDMA_RES_THRES, MTK_QTX_CFG(0)); } else { diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index ceb5a4a661e6..6b92dd6c2cda 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -642,6 +642,7 @@ struct mtk_tx_buf { * @phys: The physical addr of tx_buf * @next_free: Pointer to the next free descriptor * @last_free: Pointer to the last free descriptor + * @last_free_ptr: Hardware pointer value of the last free descriptor * @thresh: The threshold of minimum amount of free descriptors * @free_count: QDMA uses a linked list. Track how many free descriptors * are present @@ -652,6 +653,7 @@ struct mtk_tx_ring { dma_addr_t phys; struct mtk_tx_dma *next_free; struct mtk_tx_dma *last_free; + u32 last_free_ptr; u16 thresh; atomic_t free_count; int dma_size; |