This is the driver for the ST MAC 10/100/1000 on-chip Ethernet controllers.
ST Ethernet IPs are built around a Synopsys IP Core.
- Copyright (C) 2007-2009 STMicroelectronics Ltd
+ Copyright(C) 2007-2011 STMicroelectronics Ltd
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
#include <linux/if_ether.h>
#include <linux/crc32.h>
#include <linux/mii.h>
-#include <linux/phy.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/prefetch.h>
-#include "stmmac.h"
#ifdef CONFIG_STMMAC_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#endif
+#include "stmmac.h"
#define STMMAC_RESOURCE_NAME "stmmaceth"
}
}
+static int stmmac_set_bfsize(int mtu, int bufsize)
+{
+ int ret = bufsize;
+
+ if (mtu >= BUF_SIZE_4KiB)
+ ret = BUF_SIZE_8KiB;
+ else if (mtu >= BUF_SIZE_2KiB)
+ ret = BUF_SIZE_4KiB;
+ else if (mtu >= DMA_BUFFER_SIZE)
+ ret = BUF_SIZE_2KiB;
+ else
+ ret = DMA_BUFFER_SIZE;
+
+ return ret;
+}
+
/**
* init_dma_desc_rings - init the RX/TX descriptor rings
* @dev: net device structure
* Description: this function initializes the DMA RX/TX descriptors
- * and allocates the socket buffers.
+ * and allocates the socket buffers. It suppors the chained and ring
+ * modes.
*/
static void init_dma_desc_rings(struct net_device *dev)
{
struct sk_buff *skb;
unsigned int txsize = priv->dma_tx_size;
unsigned int rxsize = priv->dma_rx_size;
- unsigned int bfsize = priv->dma_buf_sz;
- int buff2_needed = 0, dis_ic = 0;
+ unsigned int bfsize;
+ int dis_ic = 0;
+ int des3_as_data_buf = 0;
- /* Set the Buffer size according to the MTU;
- * indeed, in case of jumbo we need to bump-up the buffer sizes.
- */
- if (unlikely(dev->mtu >= BUF_SIZE_8KiB))
- bfsize = BUF_SIZE_16KiB;
- else if (unlikely(dev->mtu >= BUF_SIZE_4KiB))
- bfsize = BUF_SIZE_8KiB;
- else if (unlikely(dev->mtu >= BUF_SIZE_2KiB))
- bfsize = BUF_SIZE_4KiB;
- else if (unlikely(dev->mtu >= DMA_BUFFER_SIZE))
- bfsize = BUF_SIZE_2KiB;
+ /* Set the max buffer size according to the DESC mode
+ * and the MTU. Note that RING mode allows 16KiB bsize. */
+ bfsize = priv->hw->ring->set_16kib_bfsize(dev->mtu);
+
+ if (bfsize == BUF_SIZE_16KiB)
+ des3_as_data_buf = 1;
else
- bfsize = DMA_BUFFER_SIZE;
+ bfsize = stmmac_set_bfsize(dev->mtu, priv->dma_buf_sz);
#ifdef CONFIG_STMMAC_TIMER
/* Disable interrupts on completion for the reception if timer is on */
if (likely(priv->tm->enable))
dis_ic = 1;
#endif
- /* If the MTU exceeds 8k so use the second buffer in the chain */
- if (bfsize >= BUF_SIZE_8KiB)
- buff2_needed = 1;
DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
txsize, rxsize, bfsize);
return;
}
- DBG(probe, INFO, "stmmac (%s) DMA desc rings: virt addr (Rx %p, "
+ DBG(probe, INFO, "stmmac (%s) DMA desc: virt addr (Rx %p, "
"Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
dev->name, priv->dma_rx, priv->dma_tx,
(unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
bfsize, DMA_FROM_DEVICE);
p->des2 = priv->rx_skbuff_dma[i];
- if (unlikely(buff2_needed))
- p->des3 = p->des2 + BUF_SIZE_8KiB;
+
+ priv->hw->ring->init_desc3(des3_as_data_buf, p);
+
DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
}
priv->tx_skbuff[i] = NULL;
priv->dma_tx[i].des2 = 0;
}
+
+ /* In case of Chained mode this sets the des3 to the next
+ * element in the chain */
+ priv->hw->ring->init_dma_chain(priv->dma_rx, priv->dma_rx_phy, rxsize);
+ priv->hw->ring->init_dma_chain(priv->dma_tx, priv->dma_tx_phy, txsize);
+
priv->dirty_tx = 0;
priv->cur_tx = 0;
dma_unmap_single(priv->device, p->des2,
priv->hw->desc->get_tx_len(p),
DMA_TO_DEVICE);
- if (unlikely(p->des3))
- p->des3 = 0;
+ priv->hw->ring->clean_desc3(p);
if (likely(skb != NULL)) {
/*
*/
static void stmmac_tx_err(struct stmmac_priv *priv)
{
-
netif_stop_queue(priv->dev);
priv->hw->dma->stop_tx(priv->ioaddr);
return 0;
}
-static unsigned int stmmac_handle_jumbo_frames(struct sk_buff *skb,
- struct net_device *dev,
- int csum_insertion)
-{
- struct stmmac_priv *priv = netdev_priv(dev);
- unsigned int nopaged_len = skb_headlen(skb);
- unsigned int txsize = priv->dma_tx_size;
- unsigned int entry = priv->cur_tx % txsize;
- struct dma_desc *desc = priv->dma_tx + entry;
-
- if (nopaged_len > BUF_SIZE_8KiB) {
-
- int buf2_size = nopaged_len - BUF_SIZE_8KiB;
-
- desc->des2 = dma_map_single(priv->device, skb->data,
- BUF_SIZE_8KiB, DMA_TO_DEVICE);
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 1, BUF_SIZE_8KiB,
- csum_insertion);
-
- entry = (++priv->cur_tx) % txsize;
- desc = priv->dma_tx + entry;
-
- desc->des2 = dma_map_single(priv->device,
- skb->data + BUF_SIZE_8KiB,
- buf2_size, DMA_TO_DEVICE);
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 0, buf2_size,
- csum_insertion);
- priv->hw->desc->set_tx_owner(desc);
- priv->tx_skbuff[entry] = NULL;
- } else {
- desc->des2 = dma_map_single(priv->device, skb->data,
- nopaged_len, DMA_TO_DEVICE);
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
- csum_insertion);
- }
- return entry;
-}
-
/**
* stmmac_xmit:
* @skb : the socket buffer
int i, csum_insertion = 0;
int nfrags = skb_shinfo(skb)->nr_frags;
struct dma_desc *desc, *first;
+ unsigned int nopaged_len = skb_headlen(skb);
if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
if (!netif_queue_stopped(dev)) {
pr_info("stmmac xmit:\n"
"\tskb addr %p - len: %d - nopaged_len: %d\n"
"\tn_frags: %d - ip_summed: %d - %s gso\n",
- skb, skb->len, skb_headlen(skb), nfrags, skb->ip_summed,
+ skb, skb->len, nopaged_len, nfrags, skb->ip_summed,
!skb_is_gso(skb) ? "isn't" : "is");
#endif
if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
pr_debug("stmmac xmit: skb len: %d, nopaged_len: %d,\n"
"\t\tn_frags: %d, ip_summed: %d\n",
- skb->len, skb_headlen(skb), nfrags, skb->ip_summed);
+ skb->len, nopaged_len, nfrags, skb->ip_summed);
#endif
priv->tx_skbuff[entry] = skb;
- if (unlikely(skb->len >= BUF_SIZE_4KiB)) {
- entry = stmmac_handle_jumbo_frames(skb, dev, csum_insertion);
+
+ if (priv->hw->ring->is_jumbo_frm(skb->len, priv->plat->enh_desc)) {
+ entry = priv->hw->ring->jumbo_frm(priv, skb, csum_insertion);
desc = priv->dma_tx + entry;
} else {
- unsigned int nopaged_len = skb_headlen(skb);
desc->des2 = dma_map_single(priv->device, skb->data,
nopaged_len, DMA_TO_DEVICE);
priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
DMA_FROM_DEVICE);
(p + entry)->des2 = priv->rx_skbuff_dma[entry];
- if (unlikely(priv->plat->has_gmac)) {
- if (bfsize >= BUF_SIZE_8KiB)
- (p + entry)->des3 =
- (p + entry)->des2 + BUF_SIZE_8KiB;
- }
+
+ if (unlikely(priv->plat->has_gmac))
+ priv->hw->ring->refill_desc3(bfsize, p + entry);
+
RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
}
wmb();
device->desc = &ndesc_ops;
priv->hw = device;
+ priv->hw->ring = &ring_mode_ops;
if (device_can_wakeup(priv->device)) {
priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
git.samba.org / sfrench / cifs-2.6.git / blobdiff