From c4da004857056e6ee034c4110ccdcba659077b7e Mon Sep 17 00:00:00 2001 From: Gertjan van Wingerde Date: Mon, 16 Jun 2008 19:56:31 +0200 Subject: rt2x00: Replace statically allocated DMA buffers with mapped skb's. The current PCI drivers require a lot of pre-allocated DMA buffers. Reduce this by using dynamically mapped skb's (using pci_map_single) instead of the pre- allocated DMA buffers that are allocated at device start-up time. At the same time move common RX path code into rt2x00lib from rt2x00pci and rt2x00usb, as the RX paths now are now almost the same. Signed-off-by: Gertjan van Wingerde Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2x00queue.c | 85 ++++++++++++++++++++++++++----- 1 file changed, 72 insertions(+), 13 deletions(-) (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c') diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index 278f1a1ac926..29d2b9128533 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ b/drivers/net/wireless/rt2x00/rt2x00queue.c @@ -25,21 +25,24 @@ #include #include +#include #include "rt2x00.h" #include "rt2x00lib.h" -struct sk_buff *rt2x00queue_alloc_skb(struct data_queue *queue) +struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev, + struct queue_entry *entry) { - struct sk_buff *skb; unsigned int frame_size; unsigned int reserved_size; + struct sk_buff *skb; + struct skb_frame_desc *skbdesc; /* * The frame size includes descriptor size, because the * hardware directly receive the frame into the skbuffer. */ - frame_size = queue->data_size + queue->desc_size; + frame_size = entry->queue->data_size + entry->queue->desc_size; /* * Reserve a few bytes extra headroom to allow drivers some moving @@ -57,12 +60,67 @@ struct sk_buff *rt2x00queue_alloc_skb(struct data_queue *queue) skb_reserve(skb, reserved_size); skb_put(skb, frame_size); + /* + * Populate skbdesc. + */ + skbdesc = get_skb_frame_desc(skb); + memset(skbdesc, 0, sizeof(*skbdesc)); + skbdesc->entry = entry; + + if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) { + skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, + skb->data, + skb->len, + DMA_FROM_DEVICE); + skbdesc->flags |= SKBDESC_DMA_MAPPED_RX; + } + return skb; } -EXPORT_SYMBOL_GPL(rt2x00queue_alloc_skb); +EXPORT_SYMBOL_GPL(rt2x00queue_alloc_rxskb); -void rt2x00queue_free_skb(struct sk_buff *skb) +void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) { + struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); + + skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len, + DMA_TO_DEVICE); + skbdesc->flags |= SKBDESC_DMA_MAPPED_TX; +} +EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb); + +void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) +{ + struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); + + if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) { + dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len, + DMA_FROM_DEVICE); + skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX; + } + + if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) { + dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len, + DMA_TO_DEVICE); + skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX; + } +} +EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb); + +void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) +{ + struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); + + if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) { + dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len, + DMA_FROM_DEVICE); + } + + if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) { + dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len, + DMA_TO_DEVICE); + } + dev_kfree_skb_any(skb); } EXPORT_SYMBOL_GPL(rt2x00queue_free_skb); @@ -421,7 +479,8 @@ static int rt2x00queue_alloc_entries(struct data_queue *queue, return 0; } -static void rt2x00queue_free_skbs(struct data_queue *queue) +static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev, + struct data_queue *queue) { unsigned int i; @@ -430,27 +489,27 @@ static void rt2x00queue_free_skbs(struct data_queue *queue) for (i = 0; i < queue->limit; i++) { if (queue->entries[i].skb) - rt2x00queue_free_skb(queue->entries[i].skb); + rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb); } } -static int rt2x00queue_alloc_skbs(struct data_queue *queue) +static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev, + struct data_queue *queue) { unsigned int i; struct sk_buff *skb; for (i = 0; i < queue->limit; i++) { - skb = rt2x00queue_alloc_skb(queue); + skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]); if (!skb) goto exit; - queue->entries[i].skb = skb; } return 0; exit: - rt2x00queue_free_skbs(queue); + rt2x00queue_free_skbs(rt2x00dev, queue); return -ENOMEM; } @@ -481,7 +540,7 @@ int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev) goto exit; } - status = rt2x00queue_alloc_skbs(rt2x00dev->rx); + status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx); if (status) goto exit; @@ -499,7 +558,7 @@ void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue; - rt2x00queue_free_skbs(rt2x00dev->rx); + rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx); queue_for_each(rt2x00dev, queue) { kfree(queue->entries); -- cgit v1.2.3