From b410d13e10db86832026f6ef1a9a7b4ae1c48c19 Mon Sep 17 00:00:00 2001 From: Zach Brown Date: Wed, 19 Oct 2016 09:56:57 -0500 Subject: [PATCH] net: macb: Use variables with defaults for tx/rx ring sizes instead of hardcoded values The macb driver hardcoded the tx/rx ring sizes. This made it impossible to change the sizes at run time. Add tx_ring_size, and rx_ring_size variables to macb object, which are initilized with default vales during macb_init. Change all references to RX_RING_SIZE and TX_RING_SIZE to their respective replacements. Signed-off-by: Zach Brown Signed-off-by: David S. Miller --- drivers/net/ethernet/cadence/macb.c | 114 +++++++++++++++------------- drivers/net/ethernet/cadence/macb.h | 3 + 2 files changed, 65 insertions(+), 52 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index e83781ad4477..644975da2857 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -37,14 +37,16 @@ #define MACB_RX_BUFFER_SIZE 128 #define RX_BUFFER_MULTIPLE 64 /* bytes */ -#define RX_RING_SIZE 512 /* must be power of 2 */ -#define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE) +#define DEFAULT_RX_RING_SIZE 512 /* must be power of 2 */ +#define RX_RING_BYTES(bp) (sizeof(struct macb_dma_desc) \ + * (bp)->rx_ring_size) -#define TX_RING_SIZE 128 /* must be power of 2 */ -#define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE) +#define DEFAULT_TX_RING_SIZE 512 /* must be power of 2 */ +#define TX_RING_BYTES(bp) (sizeof(struct macb_dma_desc) \ + * (bp)->tx_ring_size) /* level of occupied TX descriptors under which we wake up TX process */ -#define MACB_TX_WAKEUP_THRESH (3 * TX_RING_SIZE / 4) +#define MACB_TX_WAKEUP_THRESH(bp) (3 * (bp)->tx_ring_size / 4) #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \ | MACB_BIT(ISR_ROVR)) @@ -67,45 +69,47 @@ #define MACB_HALT_TIMEOUT 1230 /* Ring buffer accessors */ -static unsigned int macb_tx_ring_wrap(unsigned int index) +static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index) { - return index & (TX_RING_SIZE - 1); + return index & (bp->tx_ring_size - 1); } static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue, unsigned int index) { - return &queue->tx_ring[macb_tx_ring_wrap(index)]; + return &queue->tx_ring[macb_tx_ring_wrap(queue->bp, index)]; } static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue, unsigned int index) { - return &queue->tx_skb[macb_tx_ring_wrap(index)]; + return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)]; } static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index) { dma_addr_t offset; - offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc); + offset = macb_tx_ring_wrap(queue->bp, index) * + sizeof(struct macb_dma_desc); return queue->tx_ring_dma + offset; } -static unsigned int macb_rx_ring_wrap(unsigned int index) +static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index) { - return index & (RX_RING_SIZE - 1); + return index & (bp->rx_ring_size - 1); } static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index) { - return &bp->rx_ring[macb_rx_ring_wrap(index)]; + return &bp->rx_ring[macb_rx_ring_wrap(bp, index)]; } static void *macb_rx_buffer(struct macb *bp, unsigned int index) { - return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index); + return bp->rx_buffers + bp->rx_buffer_size * + macb_rx_ring_wrap(bp, index); } /* I/O accessors */ @@ -608,7 +612,8 @@ static void macb_tx_error_task(struct work_struct *work) */ if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) { netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n", - macb_tx_ring_wrap(tail), skb->data); + macb_tx_ring_wrap(bp, tail), + skb->data); bp->stats.tx_packets++; bp->stats.tx_bytes += skb->len; } @@ -700,7 +705,8 @@ static void macb_tx_interrupt(struct macb_queue *queue) /* First, update TX stats if needed */ if (skb) { netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", - macb_tx_ring_wrap(tail), skb->data); + macb_tx_ring_wrap(bp, tail), + skb->data); bp->stats.tx_packets++; bp->stats.tx_bytes += skb->len; } @@ -720,7 +726,7 @@ static void macb_tx_interrupt(struct macb_queue *queue) queue->tx_tail = tail; if (__netif_subqueue_stopped(bp->dev, queue_index) && CIRC_CNT(queue->tx_head, queue->tx_tail, - TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH) + bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp)) netif_wake_subqueue(bp->dev, queue_index); } @@ -731,8 +737,8 @@ static void gem_rx_refill(struct macb *bp) dma_addr_t paddr; while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, - RX_RING_SIZE) > 0) { - entry = macb_rx_ring_wrap(bp->rx_prepared_head); + bp->rx_ring_size) > 0) { + entry = macb_rx_ring_wrap(bp, bp->rx_prepared_head); /* Make hw descriptor updates visible to CPU */ rmb(); @@ -759,7 +765,7 @@ static void gem_rx_refill(struct macb *bp) bp->rx_skbuff[entry] = skb; - if (entry == RX_RING_SIZE - 1) + if (entry == bp->rx_ring_size - 1) paddr |= MACB_BIT(RX_WRAP); macb_set_addr(&(bp->rx_ring[entry]), paddr); bp->rx_ring[entry].ctrl = 0; @@ -813,7 +819,7 @@ static int gem_rx(struct macb *bp, int budget) dma_addr_t addr; bool rxused; - entry = macb_rx_ring_wrap(bp->rx_tail); + entry = macb_rx_ring_wrap(bp, bp->rx_tail); desc = &bp->rx_ring[entry]; /* Make hw descriptor updates visible to CPU */ @@ -895,8 +901,8 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag, len = desc->ctrl & bp->rx_frm_len_mask; netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n", - macb_rx_ring_wrap(first_frag), - macb_rx_ring_wrap(last_frag), len); + macb_rx_ring_wrap(bp, first_frag), + macb_rx_ring_wrap(bp, last_frag), len); /* The ethernet header starts NET_IP_ALIGN bytes into the * first buffer. Since the header is 14 bytes, this makes the @@ -969,12 +975,12 @@ static inline void macb_init_rx_ring(struct macb *bp) int i; addr = bp->rx_buffers_dma; - for (i = 0; i < RX_RING_SIZE; i++) { + for (i = 0; i < bp->rx_ring_size; i++) { bp->rx_ring[i].addr = addr; bp->rx_ring[i].ctrl = 0; addr += bp->rx_buffer_size; } - bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP); + bp->rx_ring[bp->rx_ring_size - 1].addr |= MACB_BIT(RX_WRAP); } static int macb_rx(struct macb *bp, int budget) @@ -1228,7 +1234,7 @@ static unsigned int macb_tx_map(struct macb *bp, offset = 0; while (len) { size = min(len, bp->max_tx_length); - entry = macb_tx_ring_wrap(tx_head); + entry = macb_tx_ring_wrap(bp, tx_head); tx_skb = &queue->tx_skb[entry]; mapping = dma_map_single(&bp->pdev->dev, @@ -1257,7 +1263,7 @@ static unsigned int macb_tx_map(struct macb *bp, offset = 0; while (len) { size = min(len, bp->max_tx_length); - entry = macb_tx_ring_wrap(tx_head); + entry = macb_tx_ring_wrap(bp, tx_head); tx_skb = &queue->tx_skb[entry]; mapping = skb_frag_dma_map(&bp->pdev->dev, frag, @@ -1295,14 +1301,14 @@ static unsigned int macb_tx_map(struct macb *bp, * to set the end of TX queue */ i = tx_head; - entry = macb_tx_ring_wrap(i); + entry = macb_tx_ring_wrap(bp, i); ctrl = MACB_BIT(TX_USED); desc = &queue->tx_ring[entry]; desc->ctrl = ctrl; do { i--; - entry = macb_tx_ring_wrap(i); + entry = macb_tx_ring_wrap(bp, i); tx_skb = &queue->tx_skb[entry]; desc = &queue->tx_ring[entry]; @@ -1311,7 +1317,7 @@ static unsigned int macb_tx_map(struct macb *bp, ctrl |= MACB_BIT(TX_LAST); eof = 0; } - if (unlikely(entry == (TX_RING_SIZE - 1))) + if (unlikely(entry == (bp->tx_ring_size - 1))) ctrl |= MACB_BIT(TX_WRAP); /* Set TX buffer descriptor */ @@ -1388,7 +1394,8 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) spin_lock_irqsave(&bp->lock, flags); /* This is a hard error, log it. */ - if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < count) { + if (CIRC_SPACE(queue->tx_head, queue->tx_tail, + bp->tx_ring_size) < count) { netif_stop_subqueue(dev, queue_index); spin_unlock_irqrestore(&bp->lock, flags); netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n", @@ -1414,7 +1421,7 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); - if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < 1) + if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1) netif_stop_subqueue(dev, queue_index); unlock: @@ -1453,7 +1460,7 @@ static void gem_free_rx_buffers(struct macb *bp) if (!bp->rx_skbuff) return; - for (i = 0; i < RX_RING_SIZE; i++) { + for (i = 0; i < bp->rx_ring_size; i++) { skb = bp->rx_skbuff[i]; if (!skb) @@ -1478,7 +1485,7 @@ static void macb_free_rx_buffers(struct macb *bp) { if (bp->rx_buffers) { dma_free_coherent(&bp->pdev->dev, - RX_RING_SIZE * bp->rx_buffer_size, + bp->rx_ring_size * bp->rx_buffer_size, bp->rx_buffers, bp->rx_buffers_dma); bp->rx_buffers = NULL; } @@ -1491,7 +1498,7 @@ static void macb_free_consistent(struct macb *bp) bp->macbgem_ops.mog_free_rx_buffers(bp); if (bp->rx_ring) { - dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES, + dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES(bp), bp->rx_ring, bp->rx_ring_dma); bp->rx_ring = NULL; } @@ -1500,7 +1507,7 @@ static void macb_free_consistent(struct macb *bp) kfree(queue->tx_skb); queue->tx_skb = NULL; if (queue->tx_ring) { - dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES, + dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES(bp), queue->tx_ring, queue->tx_ring_dma); queue->tx_ring = NULL; } @@ -1511,14 +1518,14 @@ static int gem_alloc_rx_buffers(struct macb *bp) { int size; - size = RX_RING_SIZE * sizeof(struct sk_buff *); + size = bp->rx_ring_size * sizeof(struct sk_buff *); bp->rx_skbuff = kzalloc(size, GFP_KERNEL); if (!bp->rx_skbuff) return -ENOMEM; - - netdev_dbg(bp->dev, - "Allocated %d RX struct sk_buff entries at %p\n", - RX_RING_SIZE, bp->rx_skbuff); + else + netdev_dbg(bp->dev, + "Allocated %d RX struct sk_buff entries at %p\n", + bp->rx_ring_size, bp->rx_skbuff); return 0; } @@ -1526,7 +1533,7 @@ static int macb_alloc_rx_buffers(struct macb *bp) { int size; - size = RX_RING_SIZE * bp->rx_buffer_size; + size = bp->rx_ring_size * bp->rx_buffer_size; bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size, &bp->rx_buffers_dma, GFP_KERNEL); if (!bp->rx_buffers) @@ -1545,7 +1552,7 @@ static int macb_alloc_consistent(struct macb *bp) int size; for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - size = TX_RING_BYTES; + size = TX_RING_BYTES(bp); queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size, &queue->tx_ring_dma, GFP_KERNEL); @@ -1556,13 +1563,13 @@ static int macb_alloc_consistent(struct macb *bp) q, size, (unsigned long)queue->tx_ring_dma, queue->tx_ring); - size = TX_RING_SIZE * sizeof(struct macb_tx_skb); + size = bp->tx_ring_size * sizeof(struct macb_tx_skb); queue->tx_skb = kmalloc(size, GFP_KERNEL); if (!queue->tx_skb) goto out_err; } - size = RX_RING_BYTES; + size = RX_RING_BYTES(bp); bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size, &bp->rx_ring_dma, GFP_KERNEL); if (!bp->rx_ring) @@ -1588,11 +1595,11 @@ static void gem_init_rings(struct macb *bp) int i; for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - for (i = 0; i < TX_RING_SIZE; i++) { - macb_set_addr(&(queue->tx_ring[i]), 0); + for (i = 0; i < bp->tx_ring_size; i++) { + queue->tx_ring[i].addr = 0; queue->tx_ring[i].ctrl = MACB_BIT(TX_USED); } - queue->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP); + queue->tx_ring[bp->tx_ring_size - 1].ctrl |= MACB_BIT(TX_WRAP); queue->tx_head = 0; queue->tx_tail = 0; } @@ -1609,13 +1616,13 @@ static void macb_init_rings(struct macb *bp) macb_init_rx_ring(bp); - for (i = 0; i < TX_RING_SIZE; i++) { + for (i = 0; i < bp->tx_ring_size; i++) { bp->queues[0].tx_ring[i].addr = 0; bp->queues[0].tx_ring[i].ctrl = MACB_BIT(TX_USED); } bp->queues[0].tx_head = 0; bp->queues[0].tx_tail = 0; - bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP); + bp->queues[0].tx_ring[bp->tx_ring_size - 1].ctrl |= MACB_BIT(TX_WRAP); bp->rx_tail = 0; } @@ -2148,8 +2155,8 @@ static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs, regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1)) | MACB_GREGS_VERSION; - tail = macb_tx_ring_wrap(bp->queues[0].tx_tail); - head = macb_tx_ring_wrap(bp->queues[0].tx_head); + tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail); + head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head); regs_buff[0] = macb_readl(bp, NCR); regs_buff[1] = macb_or_gem_readl(bp, NCFGR); @@ -2419,6 +2426,9 @@ static int macb_init(struct platform_device *pdev) int err; u32 val; + bp->tx_ring_size = DEFAULT_TX_RING_SIZE; + bp->rx_ring_size = DEFAULT_RX_RING_SIZE; + /* set the queue register mapping once for all: queue0 has a special * register mapping but we don't want to test the queue index then * compute the corresponding register offset at run time. diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 8bed4b52fef5..1216950c97d1 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -811,6 +811,9 @@ struct macb { void *rx_buffers; size_t rx_buffer_size; + unsigned int rx_ring_size; + unsigned int tx_ring_size; + unsigned int num_queues; unsigned int queue_mask; struct macb_queue queues[MACB_MAX_QUEUES]; -- 2.20.1