| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1428874711-23950-7-git-send-email-nbd@openwrt.org>
Date: Sun, 12 Apr 2015 23:38:29 +0200
From: Felix Fietkau <nbd@...nwrt.org>
To: netdev@...r.kernel.org
Cc: zajec5@...il.com, hauke@...ke-m.de, eric.dumazet@...il.com
Subject: [PATCH v3 7/9] bgmac: simplify dma init/cleanup
Instead of allocating buffers at device init time and initializing
descriptors at device open, do both at the same time (during open).
Free all buffers when closing the device.
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
---
drivers/net/ethernet/broadcom/bgmac.c | 70 +++++++++++++++++------------------
1 file changed, 35 insertions(+), 35 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 3ac8d9a..417415c 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -549,18 +549,26 @@ static void bgmac_dma_ring_desc_free(struct bgmac *bgmac,
ring->dma_base);
}
-static void bgmac_dma_free(struct bgmac *bgmac)
+static void bgmac_dma_cleanup(struct bgmac *bgmac)
{
int i;
- for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
bgmac_dma_tx_ring_free(bgmac, &bgmac->tx_ring[i]);
- bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
- }
- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
+
+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
bgmac_dma_rx_ring_free(bgmac, &bgmac->rx_ring[i]);
+}
+
+static void bgmac_dma_free(struct bgmac *bgmac)
+{
+ int i;
+
+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
+
+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
- }
}
static int bgmac_dma_alloc(struct bgmac *bgmac)
@@ -608,8 +616,6 @@ static int bgmac_dma_alloc(struct bgmac *bgmac)
}
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
- int j;
-
ring = &bgmac->rx_ring[i];
ring->num_slots = BGMAC_RX_RING_SLOTS;
ring->mmio_base = ring_base[i];
@@ -632,15 +638,6 @@ static int bgmac_dma_alloc(struct bgmac *bgmac)
ring->index_base = lower_32_bits(ring->dma_base);
else
ring->index_base = 0;
-
- /* Alloc RX slots */
- for (j = 0; j < ring->num_slots; j++) {
- err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
- if (err) {
- bgmac_err(bgmac, "Can't allocate skb for slot in RX ring\n");
- goto err_dma_free;
- }
- }
}
return 0;
@@ -650,10 +647,10 @@ err_dma_free:
return -ENOMEM;
}
-static void bgmac_dma_init(struct bgmac *bgmac)
+static int bgmac_dma_init(struct bgmac *bgmac)
{
struct bgmac_dma_ring *ring;
- int i;
+ int i, err;
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
ring = &bgmac->tx_ring[i];
@@ -685,8 +682,13 @@ static void bgmac_dma_init(struct bgmac *bgmac)
if (ring->unaligned)
bgmac_dma_rx_enable(bgmac, ring);
- for (j = 0; j < ring->num_slots; j++)
+ for (j = 0; j < ring->num_slots; j++) {
+ err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
+ if (err)
+ return err;
+
bgmac_dma_rx_setup_desc(bgmac, ring, j);
+ }
bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
ring->index_base +
@@ -695,6 +697,8 @@ static void bgmac_dma_init(struct bgmac *bgmac)
ring->start = 0;
ring->end = 0;
}
+
+ return 0;
}
/**************************************************
@@ -1170,11 +1174,8 @@ static void bgmac_enable(struct bgmac *bgmac)
}
/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipinit */
-static void bgmac_chip_init(struct bgmac *bgmac, bool full_init)
+static void bgmac_chip_init(struct bgmac *bgmac)
{
- struct bgmac_dma_ring *ring;
- int i;
-
/* 1 interrupt per received frame */
bgmac_write(bgmac, BGMAC_INT_RECV_LAZY, 1 << BGMAC_IRL_FC_SHIFT);
@@ -1192,16 +1193,7 @@ static void bgmac_chip_init(struct bgmac *bgmac, bool full_init)
bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + ETHER_MAX_LEN);
- if (full_init) {
- bgmac_dma_init(bgmac);
- if (1) /* FIXME: is there any case we don't want IRQs? */
- bgmac_chip_intrs_on(bgmac);
- } else {
- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
- ring = &bgmac->rx_ring[i];
- bgmac_dma_rx_enable(bgmac, ring);
- }
- }
+ bgmac_chip_intrs_on(bgmac);
bgmac_enable(bgmac);
}
@@ -1261,8 +1253,15 @@ static int bgmac_open(struct net_device *net_dev)
int err = 0;
bgmac_chip_reset(bgmac);
+
+ err = bgmac_dma_init(bgmac);
+ if (err) {
+ bgmac_dma_cleanup(bgmac);
+ return err;
+ }
+
/* Specs say about reclaiming rings here, but we do that in DMA init */
- bgmac_chip_init(bgmac, true);
+ bgmac_chip_init(bgmac);
err = request_irq(bgmac->core->irq, bgmac_interrupt, IRQF_SHARED,
KBUILD_MODNAME, net_dev);
@@ -1293,6 +1292,7 @@ static int bgmac_stop(struct net_device *net_dev)
free_irq(bgmac->core->irq, net_dev);
bgmac_chip_reset(bgmac);
+ bgmac_dma_cleanup(bgmac);
return 0;
}
--
2.2.2
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists