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Message-Id: <20210413093626.3447-2-boon.leong.ong@intel.com>
Date: Tue, 13 Apr 2021 17:36:20 +0800
From: Ong Boon Leong <boon.leong.ong@...el.com>
To: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...com>,
Jose Abreu <joabreu@...opsys.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>
Cc: alexandre.torgue@...s.st.com,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, Ong Boon Leong <boon.leong.ong@...el.com>
Subject: [PATCH net-next v2 1/7] net: stmmac: rearrange RX buffer allocation and free functions
This patch restructures the per RX queue buffer allocation from page_pool
to stmmac_alloc_rx_buffers().
We also rearrange dma_free_rx_skbufs() so that it can be used in
init_dma_rx_desc_rings() during freeing of RX buffer in the event of
page_pool allocation failure to replace the more efficient method earlier.
The replacement is needed to make the RX buffer alloc and free method
scalable to XDP ZC xsk_pool alloc and free later.
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 84 +++++++++++--------
1 file changed, 47 insertions(+), 37 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 77285646c5fc..f6d3d26ce45a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1475,6 +1475,43 @@ static void stmmac_free_tx_buffer(struct stmmac_priv *priv, u32 queue, int i)
tx_q->tx_skbuff_dma[i].map_as_page = false;
}
+/**
+ * dma_free_rx_skbufs - free RX dma buffers
+ * @priv: private structure
+ * @queue: RX queue index
+ */
+static void dma_free_rx_skbufs(struct stmmac_priv *priv, u32 queue)
+{
+ int i;
+
+ for (i = 0; i < priv->dma_rx_size; i++)
+ stmmac_free_rx_buffer(priv, queue, i);
+}
+
+static int stmmac_alloc_rx_buffers(struct stmmac_priv *priv, u32 queue,
+ gfp_t flags)
+{
+ struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+ int i;
+
+ for (i = 0; i < priv->dma_rx_size; i++) {
+ struct dma_desc *p;
+ int ret;
+
+ if (priv->extend_desc)
+ p = &((rx_q->dma_erx + i)->basic);
+ else
+ p = rx_q->dma_rx + i;
+
+ ret = stmmac_init_rx_buffers(priv, p, i, flags,
+ queue);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
/**
* stmmac_reinit_rx_buffers - reinit the RX descriptor buffer.
* @priv: driver private structure
@@ -1547,15 +1584,14 @@ static void stmmac_reinit_rx_buffers(struct stmmac_priv *priv)
return;
err_reinit_rx_buffers:
- do {
- while (--i >= 0)
- stmmac_free_rx_buffer(priv, queue, i);
+ while (queue >= 0) {
+ dma_free_rx_skbufs(priv, queue);
if (queue == 0)
break;
- i = priv->dma_rx_size;
- } while (queue-- > 0);
+ queue--;
+ }
}
/**
@@ -1572,7 +1608,6 @@ static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
u32 rx_count = priv->plat->rx_queues_to_use;
int ret = -ENOMEM;
int queue;
- int i;
/* RX INITIALIZATION */
netif_dbg(priv, probe, priv->dev,
@@ -1580,7 +1615,7 @@ static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
for (queue = 0; queue < rx_count; queue++) {
struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
- int ret;
+
netif_dbg(priv, probe, priv->dev,
"(%s) dma_rx_phy=0x%08x\n", __func__,
@@ -1596,22 +1631,12 @@ static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
"Register MEM_TYPE_PAGE_POOL RxQ-%d\n",
rx_q->queue_index);
- for (i = 0; i < priv->dma_rx_size; i++) {
- struct dma_desc *p;
-
- if (priv->extend_desc)
- p = &((rx_q->dma_erx + i)->basic);
- else
- p = rx_q->dma_rx + i;
-
- ret = stmmac_init_rx_buffers(priv, p, i, flags,
- queue);
- if (ret)
- goto err_init_rx_buffers;
- }
+ ret = stmmac_alloc_rx_buffers(priv, queue, flags);
+ if (ret < 0)
+ goto err_init_rx_buffers;
rx_q->cur_rx = 0;
- rx_q->dirty_rx = (unsigned int)(i - priv->dma_rx_size);
+ rx_q->dirty_rx = 0;
/* Setup the chained descriptor addresses */
if (priv->mode == STMMAC_CHAIN_MODE) {
@@ -1630,13 +1655,11 @@ static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
err_init_rx_buffers:
while (queue >= 0) {
- while (--i >= 0)
- stmmac_free_rx_buffer(priv, queue, i);
+ dma_free_rx_skbufs(priv, queue);
if (queue == 0)
break;
- i = priv->dma_rx_size;
queue--;
}
@@ -1731,19 +1754,6 @@ static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
return ret;
}
-/**
- * dma_free_rx_skbufs - free RX dma buffers
- * @priv: private structure
- * @queue: RX queue index
- */
-static void dma_free_rx_skbufs(struct stmmac_priv *priv, u32 queue)
-{
- int i;
-
- for (i = 0; i < priv->dma_rx_size; i++)
- stmmac_free_rx_buffer(priv, queue, i);
-}
-
/**
* dma_free_tx_skbufs - free TX dma buffers
* @priv: private structure
--
2.25.1
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