From e01ee14d499e5d09c0a9db0cac2545a018849e3d Mon Sep 17 00:00:00 2001
From: Matt Carlson <mcarlson@broadcom.com>
Date: Wed, 27 Jul 2011 14:20:50 +0000
Subject: [PATCH] tg3: Add partial fragment unmapping code
The following patches are going to break skb fragments into smaller
sizes. This patch attempts to make the change easier to digest by only
addressing the skb teardown portion.
The patch modifies the driver to skip over any BDs that have a flag set
that indicates the BD isn't the beginning of an skb fragment. Such BDs
were a result of segmentation and do not need a pci_unmap_page() call.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/tg3.c | 26 ++++++++++++++++++++++++++
drivers/net/tg3.h | 1 +
2 files changed, 27 insertions(+)
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 3f69f1ace26737..90b68a229745c3 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4840,6 +4840,12 @@ static void tg3_tx(struct tg3_napi *tnapi)
ri->skb = NULL;
+ while (ri->fragmented) {
+ ri->fragmented = false;
+ sw_idx = NEXT_TX(sw_idx);
+ ri = &tnapi->tx_buffers[sw_idx];
+ }
+
sw_idx = NEXT_TX(sw_idx);
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
@@ -4851,6 +4857,13 @@ static void tg3_tx(struct tg3_napi *tnapi)
dma_unmap_addr(ri, mapping),
skb_shinfo(skb)->frags[i].size,
PCI_DMA_TODEVICE);
+
+ while (ri->fragmented) {
+ ri->fragmented = false;
+ sw_idx = NEXT_TX(sw_idx);
+ ri = &tnapi->tx_buffers[sw_idx];
+ }
+
sw_idx = NEXT_TX(sw_idx);
}
@@ -5926,6 +5939,13 @@ static void tg3_tx_skb_unmap(struct tg3_napi *tnapi, u32 entry, int last)
dma_unmap_addr(txb, mapping),
skb_headlen(skb),
PCI_DMA_TODEVICE);
+
+ while (txb->fragmented) {
+ txb->fragmented = false;
+ entry = NEXT_TX(entry);
+ txb = &tnapi->tx_buffers[entry];
+ }
+
for (i = 0; i < last; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
@@ -5935,6 +5955,12 @@ static void tg3_tx_skb_unmap(struct tg3_napi *tnapi, u32 entry, int last)
pci_unmap_page(tnapi->tp->pdev,
dma_unmap_addr(txb, mapping),
frag->size, PCI_DMA_TODEVICE);
+
+ while (txb->fragmented) {
+ txb->fragmented = false;
+ entry = NEXT_TX(entry);
+ txb = &tnapi->tx_buffers[entry];
+ }
}
}
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index f6986ca50d803c..466dd7add12b5d 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2655,6 +2655,7 @@ struct ring_info {
struct tg3_tx_ring_info {
struct sk_buff *skb;
DEFINE_DMA_UNMAP_ADDR(mapping);
+ bool fragmented;
};
struct tg3_link_config {
--
GitLab