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Date: Thu, 6 Apr 2017 11:07:56 +0200
From: Niklas Cassel <niklas.cassel@...s.com>
To: Joao Pinto <Joao.Pinto@...opsys.com>, <davem@...emloft.net>,
<clabbe.montjoie@...il.com>, <treding@...dia.com>,
<julia.lawall@...6.fr>
CC: <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/4 v3 net-next] net: stmmac: break some functions into RX
and TX scopes
Survived 10/10 reboot + ping test
Tested-by: Niklas Cassel <niklas.cassel@...s.com>
On 04/06/2017 10:49 AM, Joao Pinto wrote:
> This patch breaks several functions into RX and TX scopes, which
> will be useful when adding multiple buffers mechanism.
>
> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
> ---
> changes v2->v3:
> - just to keep up with patch-set version
> changes v1->v2:
> - RX and TX inconsistency
> - stmmac_free_rx_buffers renamed to stmmac_free_rx_buffer
> - stmmac_free_tx_buffers renamed to stmmac_free_tx_buffer
> - some useless comments were removed
>
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 352 ++++++++++++++++------
> 1 file changed, 266 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 7cbda41..ff839e1 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -889,24 +889,41 @@ static int stmmac_init_phy(struct net_device *dev)
> return 0;
> }
>
> -static void stmmac_display_rings(struct stmmac_priv *priv)
> +static void stmmac_display_rx_rings(struct stmmac_priv *priv)
> {
> - void *head_rx, *head_tx;
> + void *head_rx;
>
> - if (priv->extend_desc) {
> + if (priv->extend_desc)
> head_rx = (void *)priv->dma_erx;
> - head_tx = (void *)priv->dma_etx;
> - } else {
> + else
> head_rx = (void *)priv->dma_rx;
> - head_tx = (void *)priv->dma_tx;
> - }
>
> - /* Display Rx ring */
> + /* Display RX ring */
> priv->hw->desc->display_ring(head_rx, DMA_RX_SIZE, true);
> - /* Display Tx ring */
> +}
> +
> +static void stmmac_display_tx_rings(struct stmmac_priv *priv)
> +{
> + void *head_tx;
> +
> + if (priv->extend_desc)
> + head_tx = (void *)priv->dma_etx;
> + else
> + head_tx = (void *)priv->dma_tx;
> +
> + /* Display TX ring */
> priv->hw->desc->display_ring(head_tx, DMA_TX_SIZE, false);
> }
>
> +static void stmmac_display_rings(struct stmmac_priv *priv)
> +{
> + /* Display RX ring */
> + stmmac_display_rx_rings(priv);
> +
> + /* Display TX ring */
> + stmmac_display_tx_rings(priv);
> +}
> +
> static int stmmac_set_bfsize(int mtu, int bufsize)
> {
> int ret = bufsize;
> @@ -924,16 +941,16 @@ static int stmmac_set_bfsize(int mtu, int bufsize)
> }
>
> /**
> - * stmmac_clear_descriptors - clear descriptors
> + * stmmac_clear_rx_descriptors - clear RX descriptors
> * @priv: driver private structure
> - * Description: this function is called to clear the tx and rx descriptors
> + * Description: this function is called to clear the RX descriptors
> * in case of both basic and extended descriptors are used.
> */
> -static void stmmac_clear_descriptors(struct stmmac_priv *priv)
> +static void stmmac_clear_rx_descriptors(struct stmmac_priv *priv)
> {
> int i;
>
> - /* Clear the Rx/Tx descriptors */
> + /* Clear the RX descriptors */
> for (i = 0; i < DMA_RX_SIZE; i++)
> if (priv->extend_desc)
> priv->hw->desc->init_rx_desc(&priv->dma_erx[i].basic,
> @@ -943,6 +960,19 @@ static void stmmac_clear_descriptors(struct stmmac_priv *priv)
> priv->hw->desc->init_rx_desc(&priv->dma_rx[i],
> priv->use_riwt, priv->mode,
> (i == DMA_RX_SIZE - 1));
> +}
> +
> +/**
> + * stmmac_clear_tx_descriptors - clear tx descriptors
> + * @priv: driver private structure
> + * Description: this function is called to clear the TX descriptors
> + * in case of both basic and extended descriptors are used.
> + */
> +static void stmmac_clear_tx_descriptors(struct stmmac_priv *priv)
> +{
> + int i;
> +
> + /* Clear the TX descriptors */
> for (i = 0; i < DMA_TX_SIZE; i++)
> if (priv->extend_desc)
> priv->hw->desc->init_tx_desc(&priv->dma_etx[i].basic,
> @@ -955,6 +985,21 @@ static void stmmac_clear_descriptors(struct stmmac_priv *priv)
> }
>
> /**
> + * stmmac_clear_descriptors - clear descriptors
> + * @priv: driver private structure
> + * Description: this function is called to clear the TX and RX descriptors
> + * in case of both basic and extended descriptors are used.
> + */
> +static void stmmac_clear_descriptors(struct stmmac_priv *priv)
> +{
> + /* Clear the RX descriptors */
> + stmmac_clear_rx_descriptors(priv);
> +
> + /* Clear the TX descriptors */
> + stmmac_clear_tx_descriptors(priv);
> +}
> +
> +/**
> * stmmac_init_rx_buffers - init the RX descriptor buffer.
> * @priv: driver private structure
> * @p: descriptor pointer
> @@ -996,7 +1041,12 @@ static int stmmac_init_rx_buffers(struct stmmac_priv *priv, struct dma_desc *p,
> return 0;
> }
>
> -static void stmmac_free_rx_buffers(struct stmmac_priv *priv, int i)
> +/**
> + * stmmac_free_rx_buffer - free RX dma buffers
> + * @priv: private structure
> + * @i: buffer index.
> + */
> +static void stmmac_free_rx_buffer(struct stmmac_priv *priv, int i)
> {
> if (priv->rx_skbuff[i]) {
> dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
> @@ -1007,14 +1057,42 @@ static void stmmac_free_rx_buffers(struct stmmac_priv *priv, int i)
> }
>
> /**
> - * init_dma_desc_rings - init the RX/TX descriptor rings
> + * stmmac_free_tx_buffer - free RX dma buffers
> + * @priv: private structure
> + * @i: buffer index.
> + */
> +static void stmmac_free_tx_buffer(struct stmmac_priv *priv, int i)
> +{
> + if (priv->tx_skbuff_dma[i].buf) {
> + if (priv->tx_skbuff_dma[i].map_as_page)
> + dma_unmap_page(priv->device,
> + priv->tx_skbuff_dma[i].buf,
> + priv->tx_skbuff_dma[i].len,
> + DMA_TO_DEVICE);
> + else
> + dma_unmap_single(priv->device,
> + priv->tx_skbuff_dma[i].buf,
> + priv->tx_skbuff_dma[i].len,
> + DMA_TO_DEVICE);
> + }
> +
> + if (priv->tx_skbuff[i]) {
> + dev_kfree_skb_any(priv->tx_skbuff[i]);
> + priv->tx_skbuff[i] = NULL;
> + priv->tx_skbuff_dma[i].buf = 0;
> + priv->tx_skbuff_dma[i].map_as_page = false;
> + }
> +}
> +
> +/**
> + * init_dma_rx_desc_rings - init the RX descriptor rings
> * @dev: net device structure
> * @flags: gfp flag.
> - * Description: this function initializes the DMA RX/TX descriptors
> + * Description: this function initializes the DMA RX descriptors
> * and allocates the socket buffers. It supports the chained and ring
> * modes.
> */
> -static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
> +static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
> {
> int i;
> struct stmmac_priv *priv = netdev_priv(dev);
> @@ -1030,10 +1108,8 @@ static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
> priv->dma_buf_sz = bfsize;
>
> netif_dbg(priv, probe, priv->dev,
> - "(%s) dma_rx_phy=0x%08x dma_tx_phy=0x%08x\n",
> - __func__, (u32)priv->dma_rx_phy, (u32)priv->dma_tx_phy);
> + "(%s) dma_rx_phy=0x%08x\n", __func__, (u32)priv->dma_rx_phy);
>
> - /* RX INITIALIZATION */
> netif_dbg(priv, probe, priv->dev,
> "SKB addresses:\nskb\t\tskb data\tdma data\n");
>
> @@ -1058,20 +1134,46 @@ static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
>
> /* Setup the chained descriptor addresses */
> if (priv->mode == STMMAC_CHAIN_MODE) {
> - if (priv->extend_desc) {
> + if (priv->extend_desc)
> priv->hw->mode->init(priv->dma_erx, priv->dma_rx_phy,
> DMA_RX_SIZE, 1);
> - priv->hw->mode->init(priv->dma_etx, priv->dma_tx_phy,
> - DMA_TX_SIZE, 1);
> - } else {
> + else
> priv->hw->mode->init(priv->dma_rx, priv->dma_rx_phy,
> DMA_RX_SIZE, 0);
> + }
> +
> + return 0;
> +err_init_rx_buffers:
> + while (--i >= 0)
> + stmmac_free_rx_buffer(priv, i);
> + return ret;
> +}
> +
> +/**
> + * init_dma_tx_desc_rings - init the TX descriptor rings
> + * @dev: net device structure.
> + * Description: this function initializes the DMA TX descriptors
> + * and allocates the socket buffers. It supports the chained and ring
> + * modes.
> + */
> +static int init_dma_tx_desc_rings(struct net_device *dev)
> +{
> + struct stmmac_priv *priv = netdev_priv(dev);
> + int i;
> +
> + netif_dbg(priv, probe, priv->dev,
> + "(%s) dma_tx_phy=0x%08x\n", __func__, (u32)priv->dma_tx_phy);
> +
> + /* Setup the chained descriptor addresses */
> + if (priv->mode == STMMAC_CHAIN_MODE) {
> + if (priv->extend_desc)
> + priv->hw->mode->init(priv->dma_etx, priv->dma_tx_phy,
> + DMA_TX_SIZE, 1);
> + else
> priv->hw->mode->init(priv->dma_tx, priv->dma_tx_phy,
> DMA_TX_SIZE, 0);
> - }
> }
>
> - /* TX INITIALIZATION */
> for (i = 0; i < DMA_TX_SIZE; i++) {
> struct dma_desc *p;
> if (priv->extend_desc)
> @@ -1099,62 +1201,69 @@ static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
> priv->cur_tx = 0;
> netdev_reset_queue(priv->dev);
>
> + return 0;
> +}
> +
> +/**
> + * init_dma_desc_rings - init the RX/TX descriptor rings
> + * @dev: net device structure
> + * @flags: gfp flag.
> + * Description: this function initializes the DMA RX/TX descriptors
> + * and allocates the socket buffers. It supports the chained and ring
> + * modes.
> + */
> +static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
> +{
> + struct stmmac_priv *priv = netdev_priv(dev);
> + int ret;
> +
> + ret = init_dma_rx_desc_rings(dev, flags);
> + if (ret)
> + return ret;
> +
> + ret = init_dma_tx_desc_rings(dev);
> +
> stmmac_clear_descriptors(priv);
>
> if (netif_msg_hw(priv))
> stmmac_display_rings(priv);
>
> - return 0;
> -err_init_rx_buffers:
> - while (--i >= 0)
> - stmmac_free_rx_buffers(priv, i);
> return ret;
> }
>
> +/**
> + * dma_free_rx_skbufs - free RX dma buffers
> + * @priv: private structure
> + */
> static void dma_free_rx_skbufs(struct stmmac_priv *priv)
> {
> int i;
>
> for (i = 0; i < DMA_RX_SIZE; i++)
> - stmmac_free_rx_buffers(priv, i);
> + stmmac_free_rx_buffer(priv, i);
> }
>
> +/**
> + * dma_free_tx_skbufs - free TX dma buffers
> + * @priv: private structure
> + */
> static void dma_free_tx_skbufs(struct stmmac_priv *priv)
> {
> int i;
>
> - for (i = 0; i < DMA_TX_SIZE; i++) {
> - if (priv->tx_skbuff_dma[i].buf) {
> - if (priv->tx_skbuff_dma[i].map_as_page)
> - dma_unmap_page(priv->device,
> - priv->tx_skbuff_dma[i].buf,
> - priv->tx_skbuff_dma[i].len,
> - DMA_TO_DEVICE);
> - else
> - dma_unmap_single(priv->device,
> - priv->tx_skbuff_dma[i].buf,
> - priv->tx_skbuff_dma[i].len,
> - DMA_TO_DEVICE);
> - }
> -
> - if (priv->tx_skbuff[i]) {
> - dev_kfree_skb_any(priv->tx_skbuff[i]);
> - priv->tx_skbuff[i] = NULL;
> - priv->tx_skbuff_dma[i].buf = 0;
> - priv->tx_skbuff_dma[i].map_as_page = false;
> - }
> - }
> + for (i = 0; i < DMA_TX_SIZE; i++)
> + stmmac_free_tx_buffer(priv, i);
> }
>
> /**
> - * alloc_dma_desc_resources - alloc TX/RX resources.
> + * alloc_dma_rx_desc_resources - alloc RX resources.
> * @priv: private structure
> * Description: according to which descriptor can be used (extend or basic)
> * this function allocates the resources for TX and RX paths. In case of
> * reception, for example, it pre-allocated the RX socket buffer in order to
> * allow zero-copy mechanism.
> */
> -static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> +static int alloc_dma_rx_desc_resources(struct stmmac_priv *priv)
> {
> int ret = -ENOMEM;
>
> @@ -1168,11 +1277,50 @@ static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> if (!priv->rx_skbuff)
> goto err_rx_skbuff;
>
> + if (priv->extend_desc) {
> + priv->dma_erx = dma_zalloc_coherent(priv->device, DMA_RX_SIZE *
> + sizeof(struct
> + dma_extended_desc),
> + &priv->dma_rx_phy,
> + GFP_KERNEL);
> + if (!priv->dma_erx)
> + goto err_dma;
> +
> + } else {
> + priv->dma_rx = dma_zalloc_coherent(priv->device, DMA_RX_SIZE *
> + sizeof(struct dma_desc),
> + &priv->dma_rx_phy,
> + GFP_KERNEL);
> + if (!priv->dma_rx)
> + goto err_dma;
> + }
> +
> + return 0;
> +
> +err_dma:
> + kfree(priv->rx_skbuff);
> +err_rx_skbuff:
> + kfree(priv->rx_skbuff_dma);
> + return ret;
> +}
> +
> +/**
> + * alloc_dma_tx_desc_resources - alloc TX resources.
> + * @priv: private structure
> + * Description: according to which descriptor can be used (extend or basic)
> + * this function allocates the resources for TX and RX paths. In case of
> + * reception, for example, it pre-allocated the RX socket buffer in order to
> + * allow zero-copy mechanism.
> + */
> +static int alloc_dma_tx_desc_resources(struct stmmac_priv *priv)
> +{
> + int ret = -ENOMEM;
> +
> priv->tx_skbuff_dma = kmalloc_array(DMA_TX_SIZE,
> sizeof(*priv->tx_skbuff_dma),
> GFP_KERNEL);
> if (!priv->tx_skbuff_dma)
> - goto err_tx_skbuff_dma;
> + return -ENOMEM;
>
> priv->tx_skbuff = kmalloc_array(DMA_TX_SIZE, sizeof(struct sk_buff *),
> GFP_KERNEL);
> @@ -1180,14 +1328,6 @@ static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> goto err_tx_skbuff;
>
> if (priv->extend_desc) {
> - priv->dma_erx = dma_zalloc_coherent(priv->device, DMA_RX_SIZE *
> - sizeof(struct
> - dma_extended_desc),
> - &priv->dma_rx_phy,
> - GFP_KERNEL);
> - if (!priv->dma_erx)
> - goto err_dma;
> -
> priv->dma_etx = dma_zalloc_coherent(priv->device, DMA_TX_SIZE *
> sizeof(struct
> dma_extended_desc),
> @@ -1200,13 +1340,6 @@ static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> goto err_dma;
> }
> } else {
> - priv->dma_rx = dma_zalloc_coherent(priv->device, DMA_RX_SIZE *
> - sizeof(struct dma_desc),
> - &priv->dma_rx_phy,
> - GFP_KERNEL);
> - if (!priv->dma_rx)
> - goto err_dma;
> -
> priv->dma_tx = dma_zalloc_coherent(priv->device, DMA_TX_SIZE *
> sizeof(struct dma_desc),
> &priv->dma_tx_phy,
> @@ -1225,42 +1358,89 @@ static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> kfree(priv->tx_skbuff);
> err_tx_skbuff:
> kfree(priv->tx_skbuff_dma);
> -err_tx_skbuff_dma:
> - kfree(priv->rx_skbuff);
> -err_rx_skbuff:
> - kfree(priv->rx_skbuff_dma);
> return ret;
> }
>
> -static void free_dma_desc_resources(struct stmmac_priv *priv)
> +/**
> + * alloc_dma_desc_resources - alloc TX/RX resources.
> + * @priv: private structure
> + * Description: according to which descriptor can be used (extend or basic)
> + * this function allocates the resources for TX and RX paths. In case of
> + * reception, for example, it pre-allocated the RX socket buffer in order to
> + * allow zero-copy mechanism.
> + */
> +static int alloc_dma_desc_resources(struct stmmac_priv *priv)
> {
> - /* Release the DMA TX/RX socket buffers */
> + int ret = alloc_dma_rx_desc_resources(priv);
> +
> + if (ret)
> + return ret;
> +
> + ret = alloc_dma_tx_desc_resources(priv);
> +
> + return ret;
> +}
> +
> +/**
> + * free_dma_rx_desc_resources - free RX dma desc resources
> + * @priv: private structure
> + */
> +static void free_dma_rx_desc_resources(struct stmmac_priv *priv)
> +{
> + /* Release the DMA RX socket buffers */
> dma_free_rx_skbufs(priv);
> - dma_free_tx_skbufs(priv);
>
> /* Free DMA regions of consistent memory previously allocated */
> - if (!priv->extend_desc) {
> - dma_free_coherent(priv->device,
> - DMA_TX_SIZE * sizeof(struct dma_desc),
> - priv->dma_tx, priv->dma_tx_phy);
> + if (!priv->extend_desc)
> dma_free_coherent(priv->device,
> DMA_RX_SIZE * sizeof(struct dma_desc),
> priv->dma_rx, priv->dma_rx_phy);
> - } else {
> - dma_free_coherent(priv->device, DMA_TX_SIZE *
> - sizeof(struct dma_extended_desc),
> - priv->dma_etx, priv->dma_tx_phy);
> + else
> dma_free_coherent(priv->device, DMA_RX_SIZE *
> sizeof(struct dma_extended_desc),
> priv->dma_erx, priv->dma_rx_phy);
> - }
> +
> kfree(priv->rx_skbuff_dma);
> kfree(priv->rx_skbuff);
> +}
> +
> +/**
> + * free_dma_tx_desc_resources - free TX dma desc resources
> + * @priv: private structure
> + */
> +static void free_dma_tx_desc_resources(struct stmmac_priv *priv)
> +{
> + /* Release the DMA TX socket buffers */
> + dma_free_tx_skbufs(priv);
> +
> + /* Free DMA regions of consistent memory previously allocated */
> + if (!priv->extend_desc)
> + dma_free_coherent(priv->device,
> + DMA_TX_SIZE * sizeof(struct dma_desc),
> + priv->dma_tx, priv->dma_tx_phy);
> + else
> + dma_free_coherent(priv->device, DMA_TX_SIZE *
> + sizeof(struct dma_extended_desc),
> + priv->dma_etx, priv->dma_tx_phy);
> +
> kfree(priv->tx_skbuff_dma);
> kfree(priv->tx_skbuff);
> }
>
> /**
> + * free_dma_desc_resources - free dma desc resources
> + * @priv: private structure
> + */
> +static void free_dma_desc_resources(struct stmmac_priv *priv)
> +{
> + /* Release the DMA RX socket buffers */
> + free_dma_rx_desc_resources(priv);
> +
> + /* Release the DMA TX socket buffers */
> + free_dma_tx_desc_resources(priv);
> +}
> +
> +/**
> * stmmac_mac_enable_rx_queues - Enable MAC rx queues
> * @priv: driver private structure
> * Description: It is used for enabling the rx queues in the MAC
>
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