From ce644ed4db3ee1075ebd9f4acc403e1f9410db21 Mon Sep 17 00:00:00 2001 From: Dhananjay Phadke Date: Sun, 23 Aug 2009 08:35:11 +0000 Subject: [PATCH] netxen: refactor tx dma mapping code Move all tx skb mapping code into netxen_map_tx_skb(). Signed-off-by: Dhananjay Phadke Signed-off-by: David S. Miller --- drivers/net/netxen/netxen_nic_main.c | 112 ++++++++++++++------------- 1 file changed, 60 insertions(+), 52 deletions(-) diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c index 008657423f8e..f618e7c8eeb1 100644 --- a/drivers/net/netxen/netxen_nic_main.c +++ b/drivers/net/netxen/netxen_nic_main.c @@ -1518,22 +1518,52 @@ netxen_tso_check(struct net_device *netdev, barrier(); } -static void -netxen_clean_tx_dma_mapping(struct pci_dev *pdev, - struct netxen_cmd_buffer *pbuf, int last) +static int +netxen_map_tx_skb(struct pci_dev *pdev, + struct sk_buff *skb, struct netxen_cmd_buffer *pbuf) { - int k; - struct netxen_skb_frag *buffrag; + struct netxen_skb_frag *nf; + struct skb_frag_struct *frag; + int i, nr_frags; + dma_addr_t map; + + nr_frags = skb_shinfo(skb)->nr_frags; + nf = &pbuf->frag_array[0]; + + map = pci_map_single(pdev, skb->data, + skb_headlen(skb), PCI_DMA_TODEVICE); + if (pci_dma_mapping_error(pdev, map)) + goto out_err; - buffrag = &pbuf->frag_array[0]; - pci_unmap_single(pdev, buffrag->dma, - buffrag->length, PCI_DMA_TODEVICE); + nf->dma = map; + nf->length = skb_headlen(skb); + + for (i = 0; i < nr_frags; i++) { + frag = &skb_shinfo(skb)->frags[i]; + nf = &pbuf->frag_array[i+1]; + + map = pci_map_page(pdev, frag->page, frag->page_offset, + frag->size, PCI_DMA_TODEVICE); + if (pci_dma_mapping_error(pdev, map)) + goto unwind; + + nf->dma = map; + nf->length = frag->size; + } + + return 0; - for (k = 1; k < last; k++) { - buffrag = &pbuf->frag_array[k]; - pci_unmap_page(pdev, buffrag->dma, - buffrag->length, PCI_DMA_TODEVICE); +unwind: + while (i > 0) { + nf = &pbuf->frag_array[i]; + pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE); } + + nf = &pbuf->frag_array[0]; + pci_unmap_single(pdev, nf->dma, skb_headlen(skb), PCI_DMA_TODEVICE); + +out_err: + return -ENOMEM; } static inline void @@ -1548,17 +1578,14 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct netxen_adapter *adapter = netdev_priv(netdev); struct nx_host_tx_ring *tx_ring = adapter->tx_ring; - struct skb_frag_struct *frag; struct netxen_cmd_buffer *pbuf; struct netxen_skb_frag *buffrag; struct cmd_desc_type0 *hwdesc, *first_desc; struct pci_dev *pdev; - dma_addr_t temp_dma; int i, k; - unsigned long offset; u32 producer; - int len, frag_count, no_of_desc; + int frag_count, no_of_desc; u32 num_txd = tx_ring->num_desc; frag_count = skb_shinfo(skb)->nr_frags + 1; @@ -1572,72 +1599,53 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) } producer = tx_ring->producer; + pbuf = &tx_ring->cmd_buf_arr[producer]; pdev = adapter->pdev; - len = skb->len - skb->data_len; - temp_dma = pci_map_single(pdev, skb->data, len, PCI_DMA_TODEVICE); - if (pci_dma_mapping_error(pdev, temp_dma)) + if (netxen_map_tx_skb(pdev, skb, pbuf)) goto drop_packet; - pbuf = &tx_ring->cmd_buf_arr[producer]; pbuf->skb = skb; pbuf->frag_count = frag_count; - buffrag = &pbuf->frag_array[0]; - buffrag->dma = temp_dma; - buffrag->length = len; - first_desc = hwdesc = &tx_ring->desc_head[producer]; netxen_clear_cmddesc((u64 *)hwdesc); - netxen_set_tx_frags_len(hwdesc, frag_count, skb->len); - netxen_set_tx_port(hwdesc, adapter->portnum); - hwdesc->buffer_length[0] = cpu_to_le16(len); - hwdesc->addr_buffer1 = cpu_to_le64(temp_dma); + netxen_set_tx_frags_len(first_desc, frag_count, skb->len); + netxen_set_tx_port(first_desc, adapter->portnum); - for (i = 1, k = 1; i < frag_count; i++, k++) { + for (i = 0; i < frag_count; i++) { - /* move to next desc. if there is a need */ - if ((i & 0x3) == 0) { - k = 0; + k = i % 4; + + if ((k == 0) && (i > 0)) { + /* move to next desc.*/ producer = get_next_index(producer, num_txd); hwdesc = &tx_ring->desc_head[producer]; netxen_clear_cmddesc((u64 *)hwdesc); - pbuf = &tx_ring->cmd_buf_arr[producer]; - pbuf->skb = NULL; - } - buffrag = &pbuf->frag_array[i]; - frag = &skb_shinfo(skb)->frags[i - 1]; - len = frag->size; - offset = frag->page_offset; - - temp_dma = pci_map_page(pdev, frag->page, offset, - len, PCI_DMA_TODEVICE); - if (pci_dma_mapping_error(pdev, temp_dma)) { - netxen_clean_tx_dma_mapping(pdev, pbuf, i); - goto drop_packet; + tx_ring->cmd_buf_arr[producer].skb = NULL; } - buffrag->dma = temp_dma; - buffrag->length = len; + buffrag = &pbuf->frag_array[i]; - hwdesc->buffer_length[k] = cpu_to_le16(len); + hwdesc->buffer_length[k] = cpu_to_le16(buffrag->length); switch (k) { case 0: - hwdesc->addr_buffer1 = cpu_to_le64(temp_dma); + hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma); break; case 1: - hwdesc->addr_buffer2 = cpu_to_le64(temp_dma); + hwdesc->addr_buffer2 = cpu_to_le64(buffrag->dma); break; case 2: - hwdesc->addr_buffer3 = cpu_to_le64(temp_dma); + hwdesc->addr_buffer3 = cpu_to_le64(buffrag->dma); break; case 3: - hwdesc->addr_buffer4 = cpu_to_le64(temp_dma); + hwdesc->addr_buffer4 = cpu_to_le64(buffrag->dma); break; } } + tx_ring->producer = get_next_index(producer, num_txd); netxen_tso_check(netdev, tx_ring, first_desc, skb); -- 2.34.1