From: Russell King (Oracle) Date: Sat, 14 Mar 2026 09:42:50 +0000 (+0000) Subject: net: stmmac: add helper to set receive tail pointer X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9d0cafa9d60738ab396aa4b68d7e40c0855b4db;p=thirdparty%2Fkernel%2Flinux.git net: stmmac: add helper to set receive tail pointer Setting the queue receive tail pointer follows a common pattern: calculate the DMA address, and then call stmmac_set_rx_tail_ptr(). The only difference between all the call sites is the index used. Factor this out into a static function, and add a comment about why it only uses the normal descriptor size. Signed-off-by: Russell King (Oracle) Link: https://patch.msgid.link/E1w1LWE-0000000DGSF-2Hbs@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 24b10db83a352..d4129e9a0fb63 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -380,6 +380,18 @@ static struct dma_desc *stmmac_get_rx_desc(struct stmmac_priv *priv, return &rx_q->dma_rx[index]; } +static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv, + struct stmmac_rx_queue *rx_q, + unsigned int chan, unsigned int index) +{ + /* This only needs to deal with normal descriptors as enhanced + * descriptiors are only supported with dwmac1000 (rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc); + stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, chan); +} + /** * stmmac_rx_dirty - Get RX queue dirty * @priv: driver private structure @@ -3302,11 +3314,8 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv) stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg, rx_q->dma_rx_phy, chan); - rx_q->rx_tail_addr = rx_q->dma_rx_phy + - (rx_q->buf_alloc_num * - sizeof(struct dma_desc)); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, - rx_q->rx_tail_addr, chan); + stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan, + rx_q->buf_alloc_num); } /* DMA TX Channel Configuration */ @@ -5023,9 +5032,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue) entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_rx_size); } rx_q->dirty_rx = entry; - rx_q->rx_tail_addr = rx_q->dma_rx_phy + - (rx_q->dirty_rx * sizeof(struct dma_desc)); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, queue); + stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx); /* Wake up Rx DMA from the suspend state if required */ stmmac_enable_dma_reception(priv, priv->ioaddr, queue); } @@ -5405,9 +5412,7 @@ static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget) if (rx_desc) { rx_q->dirty_rx = entry; - rx_q->rx_tail_addr = rx_q->dma_rx_phy + - (rx_q->dirty_rx * sizeof(struct dma_desc)); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, queue); + stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx); } return ret; @@ -6975,10 +6980,8 @@ void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue) stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg, rx_q->dma_rx_phy, rx_q->queue_index); - rx_q->rx_tail_addr = rx_q->dma_rx_phy + (rx_q->buf_alloc_num * - sizeof(struct dma_desc)); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, - rx_q->rx_tail_addr, rx_q->queue_index); + stmmac_set_queue_rx_tail_ptr(priv, rx_q, rx_q->queue_index, + rx_q->buf_alloc_num); if (rx_q->xsk_pool && rx_q->buf_alloc_num) { buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool); @@ -7129,11 +7132,8 @@ int stmmac_xdp_open(struct net_device *dev) stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg, rx_q->dma_rx_phy, chan); - rx_q->rx_tail_addr = rx_q->dma_rx_phy + - (rx_q->buf_alloc_num * - sizeof(struct dma_desc)); - stmmac_set_rx_tail_ptr(priv, priv->ioaddr, - rx_q->rx_tail_addr, chan); + stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan, + rx_q->buf_alloc_num); if (rx_q->xsk_pool && rx_q->buf_alloc_num) { buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);