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Message-Id: <20240223222434.590191-6-justin.chen@broadcom.com>
Date: Fri, 23 Feb 2024 14:24:33 -0800
From: Justin Chen <justin.chen@...adcom.com>
To: netdev@...r.kernel.org
Cc: bcm-kernel-feedback-list@...adcom.com,
florian.fainelli@...adcom.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org,
conor+dt@...nel.org,
opendmb@...il.com,
andrew@...n.ch,
hkallweit1@...il.com,
linux@...linux.org.uk,
rafal@...ecki.pl,
devicetree@...r.kernel.org,
Justin Chen <justin.chen@...adcom.com>
Subject: [PATCH net-next resend 5/6] net: bcmasp: Keep buffers through power management
There is no advantage of freeing and re-allocating buffers through
suspend and resume. This waste cycles and makes suspend/resume time
longer. We also open ourselves to failed allocations in systems with
heavy memory fragmentation.
Signed-off-by: Justin Chen <justin.chen@...adcom.com>
---
drivers/net/ethernet/broadcom/asp2/bcmasp.h | 1 +
.../net/ethernet/broadcom/asp2/bcmasp_intf.c | 181 ++++++++----------
2 files changed, 76 insertions(+), 106 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.h b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
index 61598dc070b1..127a5340625e 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.h
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
@@ -315,6 +315,7 @@ struct bcmasp_intf {
struct bcmasp_desc *rx_edpkt_cpu;
dma_addr_t rx_edpkt_dma_addr;
dma_addr_t rx_edpkt_dma_read;
+ dma_addr_t rx_edpkt_dma_valid;
/* RX buffer prefetcher ring*/
void *rx_ring_cpu;
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 36e6fae937ea..0b378a6d43e7 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -674,40 +674,78 @@ static void bcmasp_adj_link(struct net_device *dev)
phy_print_status(phydev);
}
-static int bcmasp_init_rx(struct bcmasp_intf *intf)
+static int bcmasp_alloc_buffers(struct bcmasp_intf *intf)
{
struct device *kdev = &intf->parent->pdev->dev;
struct page *buffer_pg;
- dma_addr_t dma;
- void *p;
- u32 reg;
- int ret;
+ /* Alloc RX */
intf->rx_buf_order = get_order(RING_BUFFER_SIZE);
buffer_pg = alloc_pages(GFP_KERNEL, intf->rx_buf_order);
if (!buffer_pg)
return -ENOMEM;
- dma = dma_map_page(kdev, buffer_pg, 0, RING_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- if (dma_mapping_error(kdev, dma)) {
- __free_pages(buffer_pg, intf->rx_buf_order);
- return -ENOMEM;
- }
intf->rx_ring_cpu = page_to_virt(buffer_pg);
- intf->rx_ring_dma = dma;
- intf->rx_ring_dma_valid = intf->rx_ring_dma + RING_BUFFER_SIZE - 1;
+ intf->rx_ring_dma = dma_map_page(kdev, buffer_pg, 0, RING_BUFFER_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(kdev, intf->rx_ring_dma))
+ goto free_rx_buffer;
+
+ intf->rx_edpkt_cpu = dma_alloc_coherent(kdev, DESC_RING_SIZE,
+ &intf->rx_edpkt_dma_addr, GFP_KERNEL);
+ if (!intf->rx_edpkt_cpu)
+ goto free_rx_buffer_dma;
+
+ /* Alloc TX */
+ intf->tx_spb_cpu = dma_alloc_coherent(kdev, DESC_RING_SIZE,
+ &intf->tx_spb_dma_addr, GFP_KERNEL);
+ if (!intf->tx_spb_cpu)
+ goto free_rx_edpkt_dma;
- p = dma_alloc_coherent(kdev, DESC_RING_SIZE, &intf->rx_edpkt_dma_addr,
+ intf->tx_cbs = kcalloc(DESC_RING_COUNT, sizeof(struct bcmasp_tx_cb),
GFP_KERNEL);
- if (!p) {
- ret = -ENOMEM;
- goto free_rx_ring;
- }
- intf->rx_edpkt_cpu = p;
+ if (!intf->tx_cbs)
+ goto free_tx_spb_dma;
- netif_napi_add(intf->ndev, &intf->rx_napi, bcmasp_rx_poll);
+ return 0;
+
+free_tx_spb_dma:
+ dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
+ intf->tx_spb_dma_addr);
+free_rx_edpkt_dma:
+ dma_free_coherent(kdev, DESC_RING_SIZE, intf->rx_edpkt_cpu,
+ intf->rx_edpkt_dma_addr);
+free_rx_buffer_dma:
+ dma_unmap_page(kdev, intf->rx_ring_dma, RING_BUFFER_SIZE,
+ DMA_FROM_DEVICE);
+free_rx_buffer:
+ __free_pages(buffer_pg, intf->rx_buf_order);
+
+ return -ENOMEM;
+}
+
+static void bcmasp_reclaim_free_buffers(struct bcmasp_intf *intf)
+{
+ struct device *kdev = &intf->parent->pdev->dev;
+
+ /* RX buffers */
+ dma_free_coherent(kdev, DESC_RING_SIZE, intf->rx_edpkt_cpu,
+ intf->rx_edpkt_dma_addr);
+ dma_unmap_page(kdev, intf->rx_ring_dma, RING_BUFFER_SIZE,
+ DMA_FROM_DEVICE);
+ __free_pages(virt_to_page(intf->rx_ring_cpu), intf->rx_buf_order);
+
+ /* TX buffers */
+ dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
+ intf->tx_spb_dma_addr);
+ kfree(intf->tx_cbs);
+}
+static void bcmasp_init_rx(struct bcmasp_intf *intf)
+{
+ /* Restart from index 0 */
+ intf->rx_ring_dma_valid = intf->rx_ring_dma + RING_BUFFER_SIZE - 1;
+ intf->rx_edpkt_dma_valid = intf->rx_edpkt_dma_addr + (DESC_RING_SIZE - 1);
intf->rx_edpkt_dma_read = intf->rx_edpkt_dma_addr;
intf->rx_edpkt_index = 0;
@@ -733,64 +771,23 @@ static int bcmasp_init_rx(struct bcmasp_intf *intf)
rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_addr, RX_EDPKT_DMA_WRITE);
rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_addr, RX_EDPKT_DMA_READ);
rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_addr, RX_EDPKT_DMA_BASE);
- rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_addr + (DESC_RING_SIZE - 1),
- RX_EDPKT_DMA_END);
- rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_addr + (DESC_RING_SIZE - 1),
- RX_EDPKT_DMA_VALID);
-
- reg = UMAC2FB_CFG_DEFAULT_EN |
- ((intf->channel + 11) << UMAC2FB_CFG_CHID_SHIFT);
- reg |= (0xd << UMAC2FB_CFG_OK_SEND_SHIFT);
- umac2fb_wl(intf, reg, UMAC2FB_CFG);
+ rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_valid, RX_EDPKT_DMA_END);
+ rx_edpkt_dma_wq(intf, intf->rx_edpkt_dma_valid, RX_EDPKT_DMA_VALID);
- return 0;
-
-free_rx_ring:
- dma_unmap_page(kdev, intf->rx_ring_dma, RING_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- __free_pages(virt_to_page(intf->rx_ring_cpu), intf->rx_buf_order);
-
- return ret;
+ umac2fb_wl(intf, UMAC2FB_CFG_DEFAULT_EN | ((intf->channel + 11) <<
+ UMAC2FB_CFG_CHID_SHIFT) | (0xd << UMAC2FB_CFG_OK_SEND_SHIFT),
+ UMAC2FB_CFG);
}
-static void bcmasp_reclaim_free_all_rx(struct bcmasp_intf *intf)
-{
- struct device *kdev = &intf->parent->pdev->dev;
-
- dma_free_coherent(kdev, DESC_RING_SIZE, intf->rx_edpkt_cpu,
- intf->rx_edpkt_dma_addr);
- dma_unmap_page(kdev, intf->rx_ring_dma, RING_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- __free_pages(virt_to_page(intf->rx_ring_cpu), intf->rx_buf_order);
-}
-static int bcmasp_init_tx(struct bcmasp_intf *intf)
+static void bcmasp_init_tx(struct bcmasp_intf *intf)
{
- struct device *kdev = &intf->parent->pdev->dev;
- void *p;
- int ret;
-
- p = dma_alloc_coherent(kdev, DESC_RING_SIZE, &intf->tx_spb_dma_addr,
- GFP_KERNEL);
- if (!p)
- return -ENOMEM;
-
- intf->tx_spb_cpu = p;
+ /* Restart from index 0 */
intf->tx_spb_dma_valid = intf->tx_spb_dma_addr + DESC_RING_SIZE - 1;
intf->tx_spb_dma_read = intf->tx_spb_dma_addr;
-
- intf->tx_cbs = kcalloc(DESC_RING_COUNT, sizeof(struct bcmasp_tx_cb),
- GFP_KERNEL);
- if (!intf->tx_cbs) {
- ret = -ENOMEM;
- goto free_tx_spb;
- }
-
intf->tx_spb_index = 0;
intf->tx_spb_clean_index = 0;
- netif_napi_add_tx(intf->ndev, &intf->tx_napi, bcmasp_tx_poll);
-
/* Make sure channels are disabled */
tx_spb_ctrl_wl(intf, 0x0, TX_SPB_CTRL_ENABLE);
tx_epkt_core_wl(intf, 0x0, TX_EPKT_C_CFG_MISC);
@@ -806,26 +803,6 @@ static int bcmasp_init_tx(struct bcmasp_intf *intf)
tx_spb_dma_wq(intf, intf->tx_spb_dma_addr, TX_SPB_DMA_BASE);
tx_spb_dma_wq(intf, intf->tx_spb_dma_valid, TX_SPB_DMA_END);
tx_spb_dma_wq(intf, intf->tx_spb_dma_valid, TX_SPB_DMA_VALID);
-
- return 0;
-
-free_tx_spb:
- dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
- intf->tx_spb_dma_addr);
-
- return ret;
-}
-
-static void bcmasp_reclaim_free_all_tx(struct bcmasp_intf *intf)
-{
- struct device *kdev = &intf->parent->pdev->dev;
-
- /* Free descriptors */
- dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
- intf->tx_spb_dma_addr);
-
- /* Free cbs */
- kfree(intf->tx_cbs);
}
static void bcmasp_ephy_enable_set(struct bcmasp_intf *intf, bool enable)
@@ -915,10 +892,7 @@ static void bcmasp_netif_deinit(struct net_device *dev)
bcmasp_enable_rx_irq(intf, 0);
netif_napi_del(&intf->tx_napi);
- bcmasp_reclaim_free_all_tx(intf);
-
netif_napi_del(&intf->rx_napi);
- bcmasp_reclaim_free_all_rx(intf);
}
static int bcmasp_stop(struct net_device *dev)
@@ -932,6 +906,8 @@ static int bcmasp_stop(struct net_device *dev)
bcmasp_netif_deinit(dev);
+ bcmasp_reclaim_free_buffers(intf);
+
phy_disconnect(dev->phydev);
/* Disable internal EPHY or external PHY */
@@ -1073,17 +1049,12 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
intf->old_link = -1;
intf->old_pause = -1;
- ret = bcmasp_init_tx(intf);
- if (ret)
- goto err_phy_disconnect;
-
- /* Turn on asp */
+ bcmasp_init_tx(intf);
+ netif_napi_add_tx(intf->ndev, &intf->tx_napi, bcmasp_tx_poll);
bcmasp_enable_tx(intf, 1);
- ret = bcmasp_init_rx(intf);
- if (ret)
- goto err_reclaim_tx;
-
+ bcmasp_init_rx(intf);
+ netif_napi_add(intf->ndev, &intf->rx_napi, bcmasp_rx_poll);
bcmasp_enable_rx(intf, 1);
/* Turn on UniMAC TX/RX */
@@ -1097,12 +1068,6 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
return 0;
-err_reclaim_tx:
- netif_napi_del(&intf->tx_napi);
- bcmasp_reclaim_free_all_tx(intf);
-err_phy_disconnect:
- if (phydev)
- phy_disconnect(phydev);
err_phy_disable:
if (intf->internal_phy)
bcmasp_ephy_enable_set(intf, false);
@@ -1118,6 +1083,10 @@ static int bcmasp_open(struct net_device *dev)
netif_dbg(intf, ifup, dev, "bcmasp open\n");
+ ret = bcmasp_alloc_buffers(intf);
+ if (ret)
+ return ret;
+
ret = clk_prepare_enable(intf->parent->clk);
if (ret)
return ret;
--
2.34.1
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