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Date: Tue, 22 Oct 2019 08:49:40 +0000
From: Laurentiu Tudor <laurentiu.tudor@....com>
To: Madalin-cristian Bucur <madalin.bucur@....com>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: Roy Pledge <roy.pledge@....com>
Subject: Re: [PATCH net-next 5/6] dpaa_eth: change DMA device
Hello,
On 21.10.2019 15:28, Madalin-cristian Bucur wrote:
> The DPAA Ethernet driver is using the FMan MAC as the device for DMA
> mapping. This is not actually correct, as the real DMA device is the
> FMan port (the FMan Rx port for reception and the FMan Tx port for
> transmission). Changing the device used for DMA mapping to the Fman
> Rx and Tx port devices.
>
> Signed-off-by: Madalin Bucur <madalin.bucur@....com>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> ---
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 105 +++++++++++++------------
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.h | 8 +-
> 2 files changed, 62 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> index 8d5686d88d30..639cafaa59b8 100644
> --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> @@ -1335,15 +1335,15 @@ static void dpaa_fd_release(const struct net_device *net_dev,
> vaddr = phys_to_virt(qm_fd_addr(fd));
> sgt = vaddr + qm_fd_get_offset(fd);
>
> - dma_unmap_single(dpaa_bp->dev, qm_fd_addr(fd), dpaa_bp->size,
> - DMA_FROM_DEVICE);
> + dma_unmap_single(dpaa_bp->priv->rx_dma_dev, qm_fd_addr(fd),
> + dpaa_bp->size, DMA_FROM_DEVICE);
>
> dpaa_release_sgt_members(sgt);
>
> - addr = dma_map_single(dpaa_bp->dev, vaddr, dpaa_bp->size,
> - DMA_FROM_DEVICE);
> - if (dma_mapping_error(dpaa_bp->dev, addr)) {
> - dev_err(dpaa_bp->dev, "DMA mapping failed");
> + addr = dma_map_single(dpaa_bp->priv->rx_dma_dev, vaddr,
> + dpaa_bp->size, DMA_FROM_DEVICE);
> + if (dma_mapping_error(dpaa_bp->priv->rx_dma_dev, addr)) {
> + netdev_err(net_dev, "DMA mapping failed");
> return;
> }
> bm_buffer_set64(&bmb, addr);
> @@ -1488,7 +1488,7 @@ static int dpaa_enable_tx_csum(struct dpaa_priv *priv,
>
> static int dpaa_bp_add_8_bufs(const struct dpaa_bp *dpaa_bp)
> {
> - struct device *dev = dpaa_bp->dev;
> + struct net_device *net_dev = dpaa_bp->priv->net_dev;
> struct bm_buffer bmb[8];
> dma_addr_t addr;
> void *new_buf;
> @@ -1497,16 +1497,18 @@ static int dpaa_bp_add_8_bufs(const struct dpaa_bp *dpaa_bp)
> for (i = 0; i < 8; i++) {
> new_buf = netdev_alloc_frag(dpaa_bp->raw_size);
> if (unlikely(!new_buf)) {
> - dev_err(dev, "netdev_alloc_frag() failed, size %zu\n",
> - dpaa_bp->raw_size);
> + netdev_err(net_dev,
> + "netdev_alloc_frag() failed, size %zu\n",
> + dpaa_bp->raw_size);
> goto release_previous_buffs;
> }
> new_buf = PTR_ALIGN(new_buf, SMP_CACHE_BYTES);
>
> - addr = dma_map_single(dev, new_buf,
> + addr = dma_map_single(dpaa_bp->priv->rx_dma_dev, new_buf,
> dpaa_bp->size, DMA_FROM_DEVICE);
> - if (unlikely(dma_mapping_error(dev, addr))) {
> - dev_err(dpaa_bp->dev, "DMA map failed");
> + if (unlikely(dma_mapping_error(dpaa_bp->priv->rx_dma_dev,
> + addr))) {
> + netdev_err(net_dev, "DMA map failed");
> goto release_previous_buffs;
> }
>
> @@ -1634,7 +1636,7 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
>
> if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) {
> nr_frags = skb_shinfo(skb)->nr_frags;
> - dma_unmap_single(dev, addr,
> + dma_unmap_single(priv->tx_dma_dev, addr,
> qm_fd_get_offset(fd) + DPAA_SGT_SIZE,
> dma_dir);
>
> @@ -1644,21 +1646,21 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
> sgt = phys_to_virt(addr + qm_fd_get_offset(fd));
>
> /* sgt[0] is from lowmem, was dma_map_single()-ed */
> - dma_unmap_single(dev, qm_sg_addr(&sgt[0]),
> + dma_unmap_single(priv->tx_dma_dev, qm_sg_addr(&sgt[0]),
> qm_sg_entry_get_len(&sgt[0]), dma_dir);
>
> /* remaining pages were mapped with skb_frag_dma_map() */
> for (i = 1; i <= nr_frags; i++) {
> WARN_ON(qm_sg_entry_is_ext(&sgt[i]));
>
> - dma_unmap_page(dev, qm_sg_addr(&sgt[i]),
> + dma_unmap_page(priv->tx_dma_dev, qm_sg_addr(&sgt[i]),
> qm_sg_entry_get_len(&sgt[i]), dma_dir);
> }
>
> /* Free the page frag that we allocated on Tx */
> skb_free_frag(phys_to_virt(addr));
> } else {
> - dma_unmap_single(dev, addr,
> + dma_unmap_single(priv->tx_dma_dev, addr,
> skb_tail_pointer(skb) - (u8 *)skbh, dma_dir);
> }
>
> @@ -1762,8 +1764,8 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
> goto free_buffers;
>
> count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
> - dma_unmap_single(dpaa_bp->dev, sg_addr, dpaa_bp->size,
> - DMA_FROM_DEVICE);
> + dma_unmap_single(dpaa_bp->priv->rx_dma_dev, sg_addr,
> + dpaa_bp->size, DMA_FROM_DEVICE);
> if (!skb) {
> sz = dpaa_bp->size +
> SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
> @@ -1853,7 +1855,6 @@ static int skb_to_contig_fd(struct dpaa_priv *priv,
> int *offset)
> {
> struct net_device *net_dev = priv->net_dev;
> - struct device *dev = net_dev->dev.parent;
> enum dma_data_direction dma_dir;
> unsigned char *buffer_start;
> struct sk_buff **skbh;
> @@ -1889,9 +1890,9 @@ static int skb_to_contig_fd(struct dpaa_priv *priv,
> fd->cmd |= cpu_to_be32(FM_FD_CMD_FCO);
>
> /* Map the entire buffer size that may be seen by FMan, but no more */
> - addr = dma_map_single(dev, skbh,
> + addr = dma_map_single(priv->tx_dma_dev, skbh,
> skb_tail_pointer(skb) - buffer_start, dma_dir);
> - if (unlikely(dma_mapping_error(dev, addr))) {
> + if (unlikely(dma_mapping_error(priv->tx_dma_dev, addr))) {
> if (net_ratelimit())
> netif_err(priv, tx_err, net_dev, "dma_map_single() failed\n");
> return -EINVAL;
> @@ -1907,7 +1908,6 @@ static int skb_to_sg_fd(struct dpaa_priv *priv,
> const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
> const int nr_frags = skb_shinfo(skb)->nr_frags;
> struct net_device *net_dev = priv->net_dev;
> - struct device *dev = net_dev->dev.parent;
> struct qm_sg_entry *sgt;
> struct sk_buff **skbh;
> int i, j, err, sz;
> @@ -1946,10 +1946,10 @@ static int skb_to_sg_fd(struct dpaa_priv *priv,
> qm_sg_entry_set_len(&sgt[0], frag_len);
> sgt[0].bpid = FSL_DPAA_BPID_INV;
> sgt[0].offset = 0;
> - addr = dma_map_single(dev, skb->data,
> + addr = dma_map_single(priv->tx_dma_dev, skb->data,
> skb_headlen(skb), dma_dir);
> - if (unlikely(dma_mapping_error(dev, addr))) {
> - dev_err(dev, "DMA mapping failed");
> + if (unlikely(dma_mapping_error(priv->tx_dma_dev, addr))) {
> + netdev_err(priv->net_dev, "DMA mapping failed");
> err = -EINVAL;
> goto sg0_map_failed;
> }
> @@ -1960,10 +1960,10 @@ static int skb_to_sg_fd(struct dpaa_priv *priv,
> frag = &skb_shinfo(skb)->frags[i];
> frag_len = skb_frag_size(frag);
> WARN_ON(!skb_frag_page(frag));
> - addr = skb_frag_dma_map(dev, frag, 0,
> + addr = skb_frag_dma_map(priv->tx_dma_dev, frag, 0,
> frag_len, dma_dir);
> - if (unlikely(dma_mapping_error(dev, addr))) {
> - dev_err(dev, "DMA mapping failed");
> + if (unlikely(dma_mapping_error(priv->tx_dma_dev, addr))) {
> + netdev_err(priv->net_dev, "DMA mapping failed");
> err = -EINVAL;
> goto sg_map_failed;
> }
> @@ -1986,10 +1986,10 @@ static int skb_to_sg_fd(struct dpaa_priv *priv,
> skbh = (struct sk_buff **)buffer_start;
> *skbh = skb;
>
> - addr = dma_map_single(dev, buffer_start,
> + addr = dma_map_single(priv->tx_dma_dev, buffer_start,
> priv->tx_headroom + DPAA_SGT_SIZE, dma_dir);
> - if (unlikely(dma_mapping_error(dev, addr))) {
> - dev_err(dev, "DMA mapping failed");
> + if (unlikely(dma_mapping_error(priv->tx_dma_dev, addr))) {
> + netdev_err(priv->net_dev, "DMA mapping failed");
> err = -EINVAL;
> goto sgt_map_failed;
> }
> @@ -2003,7 +2003,7 @@ static int skb_to_sg_fd(struct dpaa_priv *priv,
> sgt_map_failed:
> sg_map_failed:
> for (j = 0; j < i; j++)
> - dma_unmap_page(dev, qm_sg_addr(&sgt[j]),
> + dma_unmap_page(priv->tx_dma_dev, qm_sg_addr(&sgt[j]),
> qm_sg_entry_get_len(&sgt[j]), dma_dir);
> sg0_map_failed:
> csum_failed:
> @@ -2304,7 +2304,8 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
> return qman_cb_dqrr_consume;
> }
>
> - dma_unmap_single(dpaa_bp->dev, addr, dpaa_bp->size, DMA_FROM_DEVICE);
> + dma_unmap_single(dpaa_bp->priv->rx_dma_dev, addr, dpaa_bp->size,
> + DMA_FROM_DEVICE);
>
> /* prefetch the first 64 bytes of the frame or the SGT start */
> vaddr = phys_to_virt(addr);
> @@ -2659,7 +2660,7 @@ static inline void dpaa_bp_free_pf(const struct dpaa_bp *bp,
> {
> dma_addr_t addr = bm_buf_addr(bmb);
>
> - dma_unmap_single(bp->dev, addr, bp->size, DMA_FROM_DEVICE);
> + dma_unmap_single(bp->priv->rx_dma_dev, addr, bp->size, DMA_FROM_DEVICE);
>
> skb_free_frag(phys_to_virt(addr));
> }
> @@ -2769,25 +2770,27 @@ static int dpaa_eth_probe(struct platform_device *pdev)
> int err = 0, i, channel;
> struct device *dev;
>
> + dev = &pdev->dev;
> +
> err = bman_is_probed();
> if (!err)
> return -EPROBE_DEFER;
> if (err < 0) {
> - dev_err(&pdev->dev, "failing probe due to bman probe error\n");
> + dev_err(dev, "failing probe due to bman probe error\n");
These changes seem unrelated.
> return -ENODEV;
> }
> err = qman_is_probed();
> if (!err)
> return -EPROBE_DEFER;
> if (err < 0) {
> - dev_err(&pdev->dev, "failing probe due to qman probe error\n");
> + dev_err(dev, "failing probe due to qman probe error\n");
> return -ENODEV;
> }
> err = bman_portals_probed();
> if (!err)
> return -EPROBE_DEFER;
> if (err < 0) {
> - dev_err(&pdev->dev,
> + dev_err(dev,
> "failing probe due to bman portals probe error\n");
> return -ENODEV;
> }
> @@ -2795,19 +2798,11 @@ static int dpaa_eth_probe(struct platform_device *pdev)
> if (!err)
> return -EPROBE_DEFER;
> if (err < 0) {
> - dev_err(&pdev->dev,
> + dev_err(dev,
> "failing probe due to qman portals probe error\n");
> return -ENODEV;
> }
>
> - /* device used for DMA mapping */
> - dev = pdev->dev.parent;
> - err = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(40));
> - if (err) {
> - dev_err(dev, "dma_coerce_mask_and_coherent() failed\n");
> - return err;
> - }
Why are we dropping this explicit setting of the dma mask?
---
Best Regards, Laurentiu
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