From 9ed9ea7084f34fcb1d962a4fbd012fe8a2942df8 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Sun, 28 May 2017 17:53:04 -0700 Subject: [PATCH] nfp: don't keep count for free buffers delayed kick We only kick RX free buffer queue controller every NFP_NET_FL_BATCH (currently 16) entries. This means that we will always kick the QC when write ring index is divisable by NFP_NET_FL_BATCH. There is no need to keep counts. Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/nfp_net.h | 3 --- drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 7 ++----- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h index 7882d2604835..cb7114309656 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h @@ -328,8 +328,6 @@ struct nfp_net_rx_buf { * @idx: Ring index from Linux's perspective * @fl_qcidx: Queue Controller Peripheral (QCP) queue index for the freelist * @qcp_fl: Pointer to base of the QCP freelist queue - * @wr_ptr_add: Accumulated number of buffers to add to QCP write pointer - * (used for free list batching) * @rxbufs: Array of transmitted FL/RX buffers * @rxds: Virtual address of FL/RX ring in host memory * @dma: DMA address of the FL/RX ring @@ -343,7 +341,6 @@ struct nfp_net_rx_ring { u32 rd_p; u32 idx; - u32 wr_ptr_add; int fl_qcidx; u8 __iomem *qcp_fl; diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c index 68013d048e9d..c9a140376621 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c @@ -1212,14 +1212,12 @@ static void nfp_net_rx_give_one(const struct nfp_net_dp *dp, dma_addr + dp->rx_dma_off); rx_ring->wr_p++; - rx_ring->wr_ptr_add++; - if (rx_ring->wr_ptr_add >= NFP_NET_FL_BATCH) { + if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { /* Update write pointer of the freelist queue. Make * sure all writes are flushed before telling the hardware. */ wmb(); - nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, rx_ring->wr_ptr_add); - rx_ring->wr_ptr_add = 0; + nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); } } @@ -1245,7 +1243,6 @@ static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring) memset(rx_ring->rxds, 0, sizeof(*rx_ring->rxds) * rx_ring->cnt); rx_ring->wr_p = 0; rx_ring->rd_p = 0; - rx_ring->wr_ptr_add = 0; } /** -- 2.20.1