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Subject[PATCH v2 net-next 05/15] net: sgi: ioc3-eth: allocate space for desc rings only once
Date
Memory for descriptor rings are allocated/freed, when interface is
brought up/down. Since the size of the rings is not changeable by
hardware, we now allocate rings now during probe and free it, when
device is removed.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/sgi/ioc3-eth.c | 103 ++++++++++++++++++------------------
1 file changed, 51 insertions(+), 52 deletions(-)

diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index ba18a53fbbe6..d9d94a55ac34 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -803,25 +803,17 @@ static void ioc3_free_rings(struct ioc3_private *ip)
struct sk_buff *skb;
int rx_entry, n_entry;

- if (ip->txr) {
- ioc3_clean_tx_ring(ip);
- free_pages((unsigned long)ip->txr, 2);
- ip->txr = NULL;
- }
+ ioc3_clean_tx_ring(ip);

- if (ip->rxr) {
- n_entry = ip->rx_ci;
- rx_entry = ip->rx_pi;
+ n_entry = ip->rx_ci;
+ rx_entry = ip->rx_pi;

- while (n_entry != rx_entry) {
- skb = ip->rx_skbs[n_entry];
- if (skb)
- dev_kfree_skb_any(skb);
+ while (n_entry != rx_entry) {
+ skb = ip->rx_skbs[n_entry];
+ if (skb)
+ dev_kfree_skb_any(skb);

- n_entry = (n_entry + 1) & RX_RING_MASK;
- }
- free_page((unsigned long)ip->rxr);
- ip->rxr = NULL;
+ n_entry = (n_entry + 1) & RX_RING_MASK;
}
}

@@ -829,49 +821,34 @@ static void ioc3_alloc_rings(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3_erxbuf *rxb;
- unsigned long *rxr;
int i;

- if (!ip->rxr) {
- /* Allocate and initialize rx ring. 4kb = 512 entries */
- ip->rxr = (unsigned long *)get_zeroed_page(GFP_ATOMIC);
- rxr = ip->rxr;
- if (!rxr)
- pr_err("%s: get_zeroed_page() failed!\n", __func__);
-
- /* Now the rx buffers. The RX ring may be larger but
- * we only allocate 16 buffers for now. Need to tune
- * this for performance and memory later.
- */
- for (i = 0; i < RX_BUFFS; i++) {
- struct sk_buff *skb;
+ /* Now the rx buffers. The RX ring may be larger but
+ * we only allocate 16 buffers for now. Need to tune
+ * this for performance and memory later.
+ */
+ for (i = 0; i < RX_BUFFS; i++) {
+ struct sk_buff *skb;

- skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
- if (!skb) {
- show_free_areas(0, NULL);
- continue;
- }
+ skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
+ if (!skb) {
+ show_free_areas(0, NULL);
+ continue;
+ }

- ip->rx_skbs[i] = skb;
+ ip->rx_skbs[i] = skb;

- /* Because we reserve afterwards. */
- skb_put(skb, (1664 + RX_OFFSET));
- rxb = (struct ioc3_erxbuf *)skb->data;
- rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
- skb_reserve(skb, RX_OFFSET);
- }
- ip->rx_ci = 0;
- ip->rx_pi = RX_BUFFS;
+ /* Because we reserve afterwards. */
+ skb_put(skb, (1664 + RX_OFFSET));
+ rxb = (struct ioc3_erxbuf *)skb->data;
+ ip->rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
+ skb_reserve(skb, RX_OFFSET);
}
+ ip->rx_ci = 0;
+ ip->rx_pi = RX_BUFFS;

- if (!ip->txr) {
- /* Allocate and initialize tx rings. 16kb = 128 bufs. */
- ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
- if (!ip->txr)
- pr_err("%s: __get_free_pages() failed!\n", __func__);
- ip->tx_pi = 0;
- ip->tx_ci = 0;
- }
+ ip->tx_pi = 0;
+ ip->tx_ci = 0;
}

static void ioc3_init_rings(struct net_device *dev)
@@ -1239,6 +1216,23 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
timer_setup(&ip->ioc3_timer, ioc3_timer, 0);

ioc3_stop(ip);
+
+ /* Allocate and rx ring. 4kb = 512 entries */
+ ip->rxr = (unsigned long *)get_zeroed_page(GFP_ATOMIC);
+ if (!ip->rxr) {
+ pr_err("ioc3-eth: rx ring allocation failed\n");
+ err = -ENOMEM;
+ goto out_stop;
+ }
+
+ /* Allocate tx rings. 16kb = 128 bufs. */
+ ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
+ if (!ip->txr) {
+ pr_err("ioc3-eth: tx ring allocation failed\n");
+ err = -ENOMEM;
+ goto out_stop;
+ }
+
ioc3_init(dev);

ip->pdev = pdev;
@@ -1293,6 +1287,8 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
ioc3_stop(ip);
del_timer_sync(&ip->ioc3_timer);
ioc3_free_rings(ip);
+ kfree(ip->rxr);
+ kfree(ip->txr);
out_res:
pci_release_regions(pdev);
out_free:
@@ -1310,6 +1306,9 @@ static void ioc3_remove_one(struct pci_dev *pdev)
struct net_device *dev = pci_get_drvdata(pdev);
struct ioc3_private *ip = netdev_priv(dev);

+ kfree(ip->rxr);
+ kfree(ip->txr);
+
unregister_netdev(dev);
del_timer_sync(&ip->ioc3_timer);

--
2.13.7
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