Messages in this thread Patch in this message | | | Date | Tue, 29 Jun 2010 19:20:02 +0300 | From | Eran Liberty <> | Subject | [PATCH] gainfar.c : code cleanup |
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This patch relates to "[PATCH] gainfar.c : skb_over_panic (kernel-2.6.32.15)"
While in 2.6.32.15 it actually fixed a bug here it merely cleans up the previous attempts to fix the bug with a more coherent code.
Currently before queuing skb into the rx_recycle it is "un-skb_reserve"-ed so when taken out in gfar_new_skb() it wont be reserved twice.
This patch makes sure the alignment skb_reserve is done once, upon allocating the skb and not when taken out of the rx_recycle pool. Eliminating the need to undo anything before queue skb back to the pool.
NOTE: This patch will compile and is fairly straight forward but I do not have environment to test it as I did with the 2.6.32.15 fix.
-- Liberty
Signed-off-by: Eran Liberty <liberty@extricom.com>
--- drivers/net/gianfar.c | 54 ++++++++++++++++++++++++------------------------ 1 files changed, 27 insertions(+), 27 deletions(-)
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index 28b53d1..334c8b5 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -2342,6 +2342,15 @@ static void gfar_timeout(struct net_device *dev) schedule_work(&priv->reset_task); } +static void gfar_align_skb(struct sk_buff *skb) +{ + /* We need the data buffer to be aligned properly. We will reserve + * as many bytes as needed to align the data properly + */ + skb_reserve(skb, RXBUF_ALIGNMENT - + (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1))); +} + /* Interrupt Handler for Transmit complete */ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) { @@ -2426,9 +2435,10 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) */ if (skb_queue_len(&priv->rx_recycle) < rx_queue->rx_ring_size && skb_recycle_check(skb, priv->rx_buffer_size + - RXBUF_ALIGNMENT)) + RXBUF_ALIGNMENT)) { + gfar_align_skb(skb); __skb_queue_head(&priv->rx_recycle, skb); - else + } else dev_kfree_skb_any(skb); tx_queue->tx_skbuff[skb_dirtytx] = NULL; @@ -2491,29 +2501,28 @@ static void gfar_new_rxbdp(struct gfar_priv_rx_q *rx_queue, struct rxbd8 *bdp, gfar_init_rxbdp(rx_queue, bdp, buf); } - -struct sk_buff * gfar_new_skb(struct net_device *dev) +static struct sk_buff * gfar_alloc_skb(struct net_device *dev) { - unsigned int alignamount; struct gfar_private *priv = netdev_priv(dev); struct sk_buff *skb = NULL; - skb = __skb_dequeue(&priv->rx_recycle); - if (!skb) - skb = netdev_alloc_skb(dev, - priv->rx_buffer_size + RXBUF_ALIGNMENT); - + skb = netdev_alloc_skb(dev, priv->rx_buffer_size + RXBUF_ALIGNMENT); if (!skb) return NULL; - alignamount = RXBUF_ALIGNMENT - - (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1)); + gfar_align_skb(skb); - /* We need the data buffer to be aligned properly. We will reserve - * as many bytes as needed to align the data properly - */ - skb_reserve(skb, alignamount); - GFAR_CB(skb)->alignamount = alignamount; + return skb; +} + +struct sk_buff * gfar_new_skb(struct net_device *dev) +{ + struct gfar_private *priv = netdev_priv(dev); + struct sk_buff *skb = NULL; + + skb = __skb_dequeue(&priv->rx_recycle); + if (!skb) + skb = gfar_alloc_skb(dev); return skb; } @@ -2666,17 +2675,8 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit) if (unlikely(!newskb)) newskb = skb; - else if (skb) { - /* - * We need to un-reserve() the skb to what it - * was before gfar_new_skb() re-aligned - * it to an RXBUF_ALIGNMENT boundary - * before we put the skb back on the - * recycle list. - */ - skb_reserve(skb, -GFAR_CB(skb)->alignamount); + else if (skb) __skb_queue_head(&priv->rx_recycle, skb); - } } else { /* Increment the number of packets */ rx_queue->stats.rx_packets++; -- 1.5.6.5
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