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Date: Tue, 22 Oct 2019 10:34:40 +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
On 22.10.2019 12:10, Madalin-cristian Bucur wrote:
>> -----Original Message-----
>> From: Laurentiu Tudor
>> Sent: Tuesday, October 22, 2019 11:50 AM
>> To: Madalin-cristian Bucur <madalin.bucur@....com>; davem@...emloft.net;
>> 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.
>
> The &pdev->dev to dev replacement is not related directly to the incorrect
> DMA mapping device but a device had to be used for the prints and propagating
> &pdev->dev did not look like a good idea. Initially I had a separate patch for
> this but it's superfluous to add code and remove it in another patch doing almost
> nothing.
Fair enough.
>>> 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
>
> Hi Laurentiu, you are probably reviewing these changes with your initial
> patch in mind that was using (incorrectly) the same (Rx) port for DMA
> mapping of both receive and transmit traffic. Please take a second look at
> the changes in this patch.
My bad, didn't notice you're setting it below. Sorry for the noise.
---
Best Regards, Laurentiu
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