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Message-Id: <1428933162-26763-7-git-send-email-nbd@openwrt.org>
Date: Mon, 13 Apr 2015 15:52:40 +0200
From: Felix Fietkau <nbd@...nwrt.org>
To: netdev@...r.kernel.org
Cc: zajec5@...il.com, hauke@...ke-m.de
Subject: [PATCH v4 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 | 69 +++++++++++++++++------------------
1 file changed, 34 insertions(+), 35 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 3ac8d9a..ef9765c 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 +1253,13 @@ static int bgmac_open(struct net_device *net_dev)
int err = 0;
bgmac_chip_reset(bgmac);
+
+ err = bgmac_dma_init(bgmac);
+ if (err)
+ goto err_out;
+
/* 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);
@@ -1277,6 +1274,7 @@ static int bgmac_open(struct net_device *net_dev)
netif_carrier_on(net_dev);
err_out:
+ bgmac_dma_cleanup(bgmac);
return err;
}
@@ -1293,6 +1291,7 @@ 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
--
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