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Date: Fri, 20 Nov 2009 16:12:35 +0100
From: Simon Kagstrom <simon.kagstrom@...insight.net>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, davej@...hat.com, shemminger@...tta.com,
romieu@...zoreil.com
Subject: [PATCH 6/7] via-velocity: Re-enable the transmit scatter-gather
support
The velocity hardware can handle up to 7 memory segments.
Signed-off-by: Simon Kagstrom <simon.kagstrom@...insight.net>
---
drivers/net/via-velocity.c | 89 ++++++++++++++++++++++++++++---------------
1 files changed, 58 insertions(+), 31 deletions(-)
diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index be75814..8cce9ea 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -9,7 +9,6 @@
*
* TODO
* rx_copybreak/alignment
- * Scatter gather
* More testing
*
* The changes are (c) Copyright 2004, Red Hat Inc. <alan@...rguk.ukuu.org.uk>
@@ -1649,12 +1648,10 @@ out:
*/
static int velocity_init_td_ring(struct velocity_info *vptr)
{
- dma_addr_t curr;
int j;
/* Init the TD ring entries */
for (j = 0; j < vptr->tx.numq; j++) {
- curr = vptr->tx.pool_dma[j];
vptr->tx.infos[j] = kcalloc(vptr->options.numtx,
sizeof(struct velocity_td_info),
@@ -1720,21 +1717,27 @@ err_free_dma_rings_0:
* Release an transmit buffer. If the buffer was preallocated then
* recycle it, if not then unmap the buffer.
*/
-static void velocity_free_tx_buf(struct velocity_info *vptr, struct velocity_td_info *tdinfo)
+static void velocity_free_tx_buf(struct velocity_info *vptr,
+ struct velocity_td_info *tdinfo, struct tx_desc *td)
{
struct sk_buff *skb = tdinfo->skb;
- int i;
- int pktlen;
/*
* Don't unmap the pre-allocated tx_bufs
*/
if (tdinfo->skb_dma) {
+ int i;
- pktlen = max_t(unsigned int, skb->len, ETH_ZLEN);
for (i = 0; i < tdinfo->nskb_dma; i++) {
- pci_unmap_single(vptr->pdev, tdinfo->skb_dma[i], pktlen, PCI_DMA_TODEVICE);
- tdinfo->skb_dma[i] = 0;
+ size_t pktlen = max_t(size_t, skb->len, ETH_ZLEN);
+
+ /* For scatter-gather */
+ if (skb_shinfo(skb)->nr_frags > 0)
+ pktlen = max_t(size_t, pktlen,
+ td->td_buf[i].size & ~TD_QUEUE);
+
+ pci_unmap_single(vptr->pdev, tdinfo->skb_dma[i],
+ le16_to_cpu(pktlen), PCI_DMA_TODEVICE);
}
}
dev_kfree_skb_irq(skb);
@@ -1949,7 +1952,7 @@ static int velocity_tx_srv(struct velocity_info *vptr, u32 status)
stats->tx_packets++;
stats->tx_bytes += tdinfo->skb->len;
}
- velocity_free_tx_buf(vptr, tdinfo);
+ velocity_free_tx_buf(vptr, tdinfo, td);
vptr->tx.used[qnum]--;
}
vptr->tx.tail[qnum] = idx;
@@ -2549,14 +2552,27 @@ static netdev_tx_t velocity_xmit(struct sk_buff *skb,
struct velocity_td_info *tdinfo;
unsigned long flags;
int pktlen;
- __le16 len;
- int index;
+ int index, prev;
+ int i = 0;
if (skb_padto(skb, ETH_ZLEN))
goto out;
- pktlen = max_t(unsigned int, skb->len, ETH_ZLEN);
- len = cpu_to_le16(pktlen);
+ /* The hardware can handle at most 7 memory segments, so merge
+ * the skb if there are more */
+ if (skb_shinfo(skb)->nr_frags > 6 && __skb_linearize(skb)) {
+ kfree_skb(skb);
+ return 0;
+ }
+ /* If it's still above 6 we can't do anything */
+ if (skb_shinfo(skb)->nr_frags > 6) {
+ dev_err(&vptr->pdev->dev,
+ "via-velocity: more than 6 frags, can't send.\n");
+ return 0;
+ }
+ pktlen = skb_shinfo(skb)->nr_frags == 0 ?
+ max_t(unsigned int, skb->len, ETH_ZLEN) :
+ skb_headlen(skb);
spin_lock_irqsave(&vptr->lock, flags);
@@ -2573,11 +2589,24 @@ static netdev_tx_t velocity_xmit(struct sk_buff *skb,
*/
tdinfo->skb = skb;
tdinfo->skb_dma[0] = pci_map_single(vptr->pdev, skb->data, pktlen, PCI_DMA_TODEVICE);
- td_ptr->tdesc0.len = len;
+ td_ptr->tdesc0.len = cpu_to_le16(pktlen);
td_ptr->td_buf[0].pa_low = cpu_to_le32(tdinfo->skb_dma[0]);
td_ptr->td_buf[0].pa_high = 0;
- td_ptr->td_buf[0].size = len;
- tdinfo->nskb_dma = 1;
+ td_ptr->td_buf[0].size = cpu_to_le16(pktlen);
+
+ /* Handle fragments */
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+ tdinfo->skb_dma[i + 1] = pci_map_page(vptr->pdev, frag->page,
+ frag->page_offset, frag->size,
+ PCI_DMA_TODEVICE);
+
+ td_ptr->td_buf[i + 1].pa_low = cpu_to_le32(tdinfo->skb_dma[i + 1]);
+ td_ptr->td_buf[i + 1].pa_high = 0;
+ td_ptr->td_buf[i + 1].size = cpu_to_le16(frag->size);
+ }
+ tdinfo->nskb_dma = i + 1;
td_ptr->tdesc1.cmd = TCPLS_NORMAL + (tdinfo->nskb_dma + 1) * 16;
@@ -2598,23 +2627,21 @@ static netdev_tx_t velocity_xmit(struct sk_buff *skb,
td_ptr->tdesc1.TCR |= (TCR0_UDPCK);
td_ptr->tdesc1.TCR |= TCR0_IPCK;
}
- {
- int prev = index - 1;
+ prev = index - 1;
+ if (prev < 0)
+ prev = vptr->options.numtx - 1;
+ td_ptr->tdesc0.len |= OWNED_BY_NIC;
+ vptr->tx.used[qnum]++;
+ vptr->tx.curr[qnum] = (index + 1) % vptr->options.numtx;
- if (prev < 0)
- prev = vptr->options.numtx - 1;
- td_ptr->tdesc0.len |= OWNED_BY_NIC;
- vptr->tx.used[qnum]++;
- vptr->tx.curr[qnum] = (index + 1) % vptr->options.numtx;
+ if (AVAIL_TD(vptr, qnum) < 1)
+ netif_stop_queue(dev);
- if (AVAIL_TD(vptr, qnum) < 1)
- netif_stop_queue(dev);
+ td_ptr = &(vptr->tx.rings[qnum][prev]);
+ td_ptr->td_buf[0].size |= TD_QUEUE;
+ mac_tx_queue_wake(vptr->mac_regs, qnum);
- td_ptr = &(vptr->tx.rings[qnum][prev]);
- td_ptr->td_buf[0].size |= TD_QUEUE;
- mac_tx_queue_wake(vptr->mac_regs, qnum);
- }
dev->trans_start = jiffies;
spin_unlock_irqrestore(&vptr->lock, flags);
out:
@@ -2837,7 +2864,7 @@ static int __devinit velocity_found1(struct pci_dev *pdev, const struct pci_devi
netif_napi_add(dev, &vptr->napi, velocity_poll, VELOCITY_NAPI_WEIGHT);
dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER |
- NETIF_F_HW_VLAN_RX;
+ NETIF_F_HW_VLAN_RX | NETIF_F_SG;
if (vptr->flags & VELOCITY_FLAGS_TX_CSUM)
dev->features |= NETIF_F_IP_CSUM;
--
1.6.0.4
--
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