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Date: Tue, 27 Sep 2022 14:47:37 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Ioana Ciornei <ioana.ciornei@....com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org,
Robert-Ionut Alexa <robert-ionut.alexa@....com>
Subject: Re: [PATCH net-next v2 03/12] net: dpaa2-eth: add support for
multiple buffer pools per DPNI
On Fri, 2022-09-23 at 18:45 +0300, Ioana Ciornei wrote:
> From: Robert-Ionut Alexa <robert-ionut.alexa@....com>
>
> This patch allows the configuration of multiple buffer pools associated
> with a single DPNI object, each distinct DPBP object not necessarily
> shared among all queues.
> The user can interogate both the number of buffer pools and the buffer
> count in each buffer pool by using the .get_ethtool_stats() callback.
>
> Signed-off-by: Robert-Ionut Alexa <robert-ionut.alexa@....com>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> Changes in v2:
> - Export dpaa2_eth_allocate_dpbp/dpaa2_eth_free_dpbp in this patch to
> avoid a build warning. The functions will be used in next patches.
>
> .../net/ethernet/freescale/dpaa2/dpaa2-eth.c | 188 ++++++++++++------
> .../net/ethernet/freescale/dpaa2/dpaa2-eth.h | 26 ++-
> .../ethernet/freescale/dpaa2/dpaa2-ethtool.c | 15 +-
> 3 files changed, 162 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> index 75d51572693d..aa93ed339b63 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> @@ -1,6 +1,6 @@
> // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
> /* Copyright 2014-2016 Freescale Semiconductor Inc.
> - * Copyright 2016-2020 NXP
> + * Copyright 2016-2022 NXP
> */
> #include <linux/init.h>
> #include <linux/module.h>
> @@ -304,7 +304,7 @@ static void dpaa2_eth_recycle_buf(struct dpaa2_eth_priv *priv,
> if (ch->recycled_bufs_cnt < DPAA2_ETH_BUFS_PER_CMD)
> return;
>
> - while ((err = dpaa2_io_service_release(ch->dpio, priv->bpid,
> + while ((err = dpaa2_io_service_release(ch->dpio, ch->bp->bpid,
> ch->recycled_bufs,
> ch->recycled_bufs_cnt)) == -EBUSY) {
> if (retries++ >= DPAA2_ETH_SWP_BUSY_RETRIES)
> @@ -1631,7 +1631,7 @@ static int dpaa2_eth_set_tx_csum(struct dpaa2_eth_priv *priv, bool enable)
> * to the specified buffer pool
> */
> static int dpaa2_eth_add_bufs(struct dpaa2_eth_priv *priv,
> - struct dpaa2_eth_channel *ch, u16 bpid)
> + struct dpaa2_eth_channel *ch)
> {
> struct device *dev = priv->net_dev->dev.parent;
> u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
> @@ -1663,12 +1663,12 @@ static int dpaa2_eth_add_bufs(struct dpaa2_eth_priv *priv,
> trace_dpaa2_eth_buf_seed(priv->net_dev, page_address(page),
> DPAA2_ETH_RX_BUF_RAW_SIZE,
> addr, priv->rx_buf_size,
> - bpid);
> + ch->bp->bpid);
> }
>
> release_bufs:
> /* In case the portal is busy, retry until successful */
> - while ((err = dpaa2_io_service_release(ch->dpio, bpid,
> + while ((err = dpaa2_io_service_release(ch->dpio, ch->bp->bpid,
> buf_array, i)) == -EBUSY) {
> if (retries++ >= DPAA2_ETH_SWP_BUSY_RETRIES)
> break;
> @@ -1697,39 +1697,59 @@ static int dpaa2_eth_add_bufs(struct dpaa2_eth_priv *priv,
> return 0;
> }
>
> -static int dpaa2_eth_seed_pool(struct dpaa2_eth_priv *priv, u16 bpid)
> +static int dpaa2_eth_seed_pool(struct dpaa2_eth_priv *priv,
> + struct dpaa2_eth_channel *ch)
> {
> - int i, j;
> + int i;
> int new_count;
>
> - for (j = 0; j < priv->num_channels; j++) {
> - for (i = 0; i < DPAA2_ETH_NUM_BUFS;
> - i += DPAA2_ETH_BUFS_PER_CMD) {
> - new_count = dpaa2_eth_add_bufs(priv, priv->channel[j], bpid);
> - priv->channel[j]->buf_count += new_count;
> + for (i = 0; i < DPAA2_ETH_NUM_BUFS; i += DPAA2_ETH_BUFS_PER_CMD) {
> + new_count = dpaa2_eth_add_bufs(priv, ch);
> + ch->buf_count += new_count;
>
> - if (new_count < DPAA2_ETH_BUFS_PER_CMD) {
> - return -ENOMEM;
> - }
> - }
> + if (new_count < DPAA2_ETH_BUFS_PER_CMD)
> + return -ENOMEM;
> }
>
> return 0;
> }
>
> +static void dpaa2_eth_seed_pools(struct dpaa2_eth_priv *priv)
> +{
> + struct net_device *net_dev = priv->net_dev;
> + struct dpaa2_eth_channel *channel;
> + int i, err = 0;
> +
> + for (i = 0; i < priv->num_channels; i++) {
> + channel = priv->channel[i];
> +
> + err = dpaa2_eth_seed_pool(priv, channel);
> +
> + /* Not much to do; the buffer pool, though not filled up,
> + * may still contain some buffers which would enable us
> + * to limp on.
> + */
> + if (err)
> + netdev_err(net_dev, "Buffer seeding failed for DPBP %d (bpid=%d)\n",
> + channel->bp->dev->obj_desc.id,
> + channel->bp->bpid);
> + }
> +}
> +
> /*
> - * Drain the specified number of buffers from the DPNI's private buffer pool.
> + * Drain the specified number of buffers from one of the DPNI's private buffer
> + * pools.
> * @count must not exceeed DPAA2_ETH_BUFS_PER_CMD
> */
> -static void dpaa2_eth_drain_bufs(struct dpaa2_eth_priv *priv, int count)
> +static void dpaa2_eth_drain_bufs(struct dpaa2_eth_priv *priv, int bpid,
> + int count)
> {
> u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
> int retries = 0;
> int ret;
>
> do {
> - ret = dpaa2_io_service_acquire(NULL, priv->bpid,
> - buf_array, count);
> + ret = dpaa2_io_service_acquire(NULL, bpid, buf_array, count);
> if (ret < 0) {
> if (ret == -EBUSY &&
> retries++ < DPAA2_ETH_SWP_BUSY_RETRIES)
> @@ -1742,23 +1762,35 @@ static void dpaa2_eth_drain_bufs(struct dpaa2_eth_priv *priv, int count)
> } while (ret);
> }
>
> -static void dpaa2_eth_drain_pool(struct dpaa2_eth_priv *priv)
> +static void dpaa2_eth_drain_pool(struct dpaa2_eth_priv *priv, int bpid)
> {
> int i;
>
> - dpaa2_eth_drain_bufs(priv, DPAA2_ETH_BUFS_PER_CMD);
> - dpaa2_eth_drain_bufs(priv, 1);
> + /* Drain the buffer pool */
> + dpaa2_eth_drain_bufs(priv, bpid, DPAA2_ETH_BUFS_PER_CMD);
> + dpaa2_eth_drain_bufs(priv, bpid, 1);
>
> + /* Setup to zero the buffer count of all channels which were
> + * using this buffer pool.
> + */
> for (i = 0; i < priv->num_channels; i++)
> - priv->channel[i]->buf_count = 0;
> + if (priv->channel[i]->bp->bpid == bpid)
> + priv->channel[i]->buf_count = 0;
> +}
> +
> +static void dpaa2_eth_drain_pools(struct dpaa2_eth_priv *priv)
> +{
> + int i;
> +
> + for (i = 0; i < priv->num_bps; i++)
> + dpaa2_eth_drain_pool(priv, priv->bp[i]->bpid);
> }
>
> /* Function is called from softirq context only, so we don't need to guard
> * the access to percpu count
> */
> static int dpaa2_eth_refill_pool(struct dpaa2_eth_priv *priv,
> - struct dpaa2_eth_channel *ch,
> - u16 bpid)
> + struct dpaa2_eth_channel *ch)
> {
> int new_count;
>
> @@ -1766,7 +1798,7 @@ static int dpaa2_eth_refill_pool(struct dpaa2_eth_priv *priv,
> return 0;
>
> do {
> - new_count = dpaa2_eth_add_bufs(priv, ch, bpid);
> + new_count = dpaa2_eth_add_bufs(priv, ch);
> if (unlikely(!new_count)) {
> /* Out of memory; abort for now, we'll try later on */
> break;
> @@ -1848,7 +1880,7 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
> break;
>
> /* Refill pool if appropriate */
> - dpaa2_eth_refill_pool(priv, ch, priv->bpid);
> + dpaa2_eth_refill_pool(priv, ch);
>
> store_cleaned = dpaa2_eth_consume_frames(ch, &fq);
> if (store_cleaned <= 0)
> @@ -2047,15 +2079,7 @@ static int dpaa2_eth_open(struct net_device *net_dev)
> struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
> int err;
>
> - err = dpaa2_eth_seed_pool(priv, priv->bpid);
> - if (err) {
> - /* Not much to do; the buffer pool, though not filled up,
> - * may still contain some buffers which would enable us
> - * to limp on.
> - */
> - netdev_err(net_dev, "Buffer seeding failed for DPBP %d (bpid=%d)\n",
> - priv->dpbp_dev->obj_desc.id, priv->bpid);
> - }
> + dpaa2_eth_seed_pools(priv);
>
> if (!dpaa2_eth_is_type_phy(priv)) {
> /* We'll only start the txqs when the link is actually ready;
> @@ -2088,7 +2112,7 @@ static int dpaa2_eth_open(struct net_device *net_dev)
>
> enable_err:
> dpaa2_eth_disable_ch_napi(priv);
> - dpaa2_eth_drain_pool(priv);
> + dpaa2_eth_drain_pools(priv);
> return err;
> }
>
> @@ -2193,7 +2217,7 @@ static int dpaa2_eth_stop(struct net_device *net_dev)
> dpaa2_eth_disable_ch_napi(priv);
>
> /* Empty the buffer pool */
> - dpaa2_eth_drain_pool(priv);
> + dpaa2_eth_drain_pools(priv);
>
> /* Empty the Scatter-Gather Buffer cache */
> dpaa2_eth_sgt_cache_drain(priv);
> @@ -3204,13 +3228,14 @@ static void dpaa2_eth_setup_fqs(struct dpaa2_eth_priv *priv)
> dpaa2_eth_set_fq_affinity(priv);
> }
>
> -/* Allocate and configure one buffer pool for each interface */
> -static int dpaa2_eth_setup_dpbp(struct dpaa2_eth_priv *priv)
> +/* Allocate and configure a buffer pool */
> +struct dpaa2_eth_bp *dpaa2_eth_allocate_dpbp(struct dpaa2_eth_priv *priv)
> {
> - int err;
> - struct fsl_mc_device *dpbp_dev;
> struct device *dev = priv->net_dev->dev.parent;
> + struct fsl_mc_device *dpbp_dev;
> struct dpbp_attr dpbp_attrs;
> + struct dpaa2_eth_bp *bp;
> + int err;
>
> err = fsl_mc_object_allocate(to_fsl_mc_device(dev), FSL_MC_POOL_DPBP,
> &dpbp_dev);
> @@ -3219,12 +3244,16 @@ static int dpaa2_eth_setup_dpbp(struct dpaa2_eth_priv *priv)
> err = -EPROBE_DEFER;
> else
> dev_err(dev, "DPBP device allocation failed\n");
> - return err;
> + return ERR_PTR(err);
> }
>
> - priv->dpbp_dev = dpbp_dev;
> + bp = kzalloc(sizeof(*bp), GFP_KERNEL);
> + if (!bp) {
> + err = -ENOMEM;
> + goto err_alloc;
> + }
It looks like 'bp' is leaked on later error paths.
Cheers,
Paolo
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