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From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 12 Apr 2015 23:28:38 +0200
Subject: [PATCH] bgmac: drop ring->num_slots
The ring size is always known at compile time, so make the code a bit
more efficient
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -123,7 +123,7 @@ bgmac_dma_tx_add_buf(struct bgmac *bgmac
struct bgmac_dma_desc *dma_desc;
u32 ctl1;
- if (i == ring->num_slots - 1)
+ if (i == BGMAC_TX_RING_SLOTS - 1)
ctl0 |= BGMAC_DESC_CTL0_EOT;
ctl1 = len & BGMAC_DESC_CTL1_LEN;
@@ -382,7 +382,7 @@ static void bgmac_dma_rx_setup_desc(stru
struct bgmac_dma_desc *dma_desc = ring->cpu_base + desc_idx;
u32 ctl0 = 0, ctl1 = 0;
- if (desc_idx == ring->num_slots - 1)
+ if (desc_idx == BGMAC_RX_RING_SLOTS - 1)
ctl0 |= BGMAC_DESC_CTL0_EOT;
ctl1 |= BGMAC_RX_BUF_SIZE & BGMAC_DESC_CTL1_LEN;
/* Is there any BGMAC device that requires extension? */
@@ -521,7 +521,7 @@ static void bgmac_dma_tx_ring_free(struc
struct bgmac_slot_info *slot;
int i;
- for (i = 0; i < ring->num_slots; i++) {
+ for (i = 0; i < BGMAC_TX_RING_SLOTS; i++) {
int len = dma_desc[i].ctl1 & BGMAC_DESC_CTL1_LEN;
slot = &ring->slots[i];
@@ -546,7 +546,7 @@ static void bgmac_dma_rx_ring_free(struc
struct bgmac_slot_info *slot;
int i;
- for (i = 0; i < ring->num_slots; i++) {
+ for (i = 0; i < BGMAC_RX_RING_SLOTS; i++) {
slot = &ring->slots[i];
if (!slot->dma_addr)
continue;
@@ -560,7 +560,8 @@ static void bgmac_dma_rx_ring_free(struc
}
static void bgmac_dma_ring_desc_free(struct bgmac *bgmac,
- struct bgmac_dma_ring *ring)
+ struct bgmac_dma_ring *ring,
+ int num_slots)
{
struct device *dma_dev = bgmac->core->dma_dev;
int size;
@@ -569,7 +570,7 @@ static void bgmac_dma_ring_desc_free(str
return;
/* Free ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = num_slots * sizeof(struct bgmac_dma_desc);
dma_free_coherent(dma_dev, size, ring->cpu_base,
ring->dma_base);
}
@@ -590,10 +591,12 @@ static void bgmac_dma_free(struct bgmac
int i;
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
- bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i],
+ BGMAC_TX_RING_SLOTS);
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
- bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i],
+ BGMAC_RX_RING_SLOTS);
}
static int bgmac_dma_alloc(struct bgmac *bgmac)
@@ -616,11 +619,10 @@ static int bgmac_dma_alloc(struct bgmac
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
ring = &bgmac->tx_ring[i];
- ring->num_slots = BGMAC_TX_RING_SLOTS;
ring->mmio_base = ring_base[i];
/* Alloc ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = BGMAC_TX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
&ring->dma_base,
GFP_KERNEL);
@@ -642,11 +644,10 @@ static int bgmac_dma_alloc(struct bgmac
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
ring = &bgmac->rx_ring[i];
- ring->num_slots = BGMAC_RX_RING_SLOTS;
ring->mmio_base = ring_base[i];
/* Alloc ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = BGMAC_RX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
&ring->dma_base,
GFP_KERNEL);
@@ -709,7 +710,7 @@ static int bgmac_dma_init(struct bgmac *
ring->start = 0;
ring->end = 0;
- for (j = 0; j < ring->num_slots; j++) {
+ for (j = 0; j < BGMAC_RX_RING_SLOTS; j++) {
err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
if (err)
goto error;
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -419,11 +419,10 @@ struct bgmac_dma_ring {
u32 start;
u32 end;
- u16 num_slots;
- u16 mmio_base;
struct bgmac_dma_desc *cpu_base;
dma_addr_t dma_base;
u32 index_base; /* Used for unaligned rings only, otherwise 0 */
+ u16 mmio_base;
bool unaligned;
struct bgmac_slot_info slots[BGMAC_RX_RING_SLOTS];
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