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Message-ID: <ZbiCWtY8ODrroHIq@xhacker>
Date: Tue, 30 Jan 2024 13:00:10 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Petr Tesarik <petr@...arici.cz>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
"open list:STMMAC ETHERNET DRIVER" <netdev@...r.kernel.org>,
"moderated list:ARM/STM32 ARCHITECTURE" <linux-stm32@...md-mailman.stormreply.com>,
"moderated list:ARM/STM32 ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:ARM/Allwinner sunXi SoC support" <linux-sunxi@...ts.linux.dev>,
Marc Haber <mh+netdev@...schlus.de>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH net v2] net: stmmac: protect updates of 64-bit statistics
counters
On Sun, Jan 28, 2024 at 08:35:29PM +0100, Petr Tesarik wrote:
> As explained by a comment in <linux/u64_stats_sync.h>, write side of struct
> u64_stats_sync must ensure mutual exclusion, or one seqcount update could
> be lost on 32-bit platforms, thus blocking readers forever. Such lockups
> have been observed in real world after stmmac_xmit() on one CPU raced with
> stmmac_napi_poll_tx() on another CPU.
>
> To fix the issue without introducing a new lock, split the statics into
> three parts:
>
> 1. fields updated only under the tx queue lock,
> 2. fields updated only during NAPI poll,
> 3. fields updated only from interrupt context,
>
> Updates to fields in the first two groups are already serialized through
> other locks. It is sufficient to split the existing struct u64_stats_sync
> so that each group has its own.
>
> Note that tx_set_ic_bit is updated from both contexts. Split this counter
> so that each context gets its own, and calculate their sum to get the total
> value in stmmac_get_ethtool_stats().
>
> For the third group, multiple interrupts may be processed by different CPUs
> at the same time, but interrupts on the same CPU will not nest. Move fields
> from this group to a newly created per-cpu struct stmmac_pcpu_stats.
>
> Fixes: 133466c3bbe1 ("net: stmmac: use per-queue 64 bit statistics where necessary")
> Link: https://lore.kernel.org/netdev/Za173PhviYg-1qIn@torres.zugschlus.de/t/
> Cc: stable@...r.kernel.org
> Signed-off-by: Petr Tesarik <petr@...arici.cz>
Thanks for the fix patch. One trivial improviement below
s/netdev_alloc_pcpu_stats/devm_netdev_alloc_pcpu_stats to simplify
error and exit code path.
With that:
Reviewed-by: Jisheng Zhang <jszhang@...nel.org>
PS: when I sent the above "net: stmmac: use per-queue 64 bit statistics
where necessary", I had an impression: there are too much statistics in
stmmac driver, I didn't see so many statistics in other eth drivers, is
it possible to remove some useless or not that useful statistic members?
> ---
> drivers/net/ethernet/stmicro/stmmac/common.h | 56 +++++--
> .../net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 15 +-
> .../net/ethernet/stmicro/stmmac/dwmac4_lib.c | 15 +-
> .../net/ethernet/stmicro/stmmac/dwmac_lib.c | 15 +-
> .../ethernet/stmicro/stmmac/dwxgmac2_dma.c | 15 +-
> .../ethernet/stmicro/stmmac/stmmac_ethtool.c | 129 ++++++++++------
> .../net/ethernet/stmicro/stmmac/stmmac_main.c | 141 +++++++++---------
> 7 files changed, 227 insertions(+), 159 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
> index 721c1f8e892f..4aca20feb4b7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
> @@ -59,28 +59,51 @@
> #undef FRAME_FILTER_DEBUG
> /* #define FRAME_FILTER_DEBUG */
>
> +struct stmmac_q_tx_stats {
> + u64_stats_t tx_bytes;
> + u64_stats_t tx_set_ic_bit;
> + u64_stats_t tx_tso_frames;
> + u64_stats_t tx_tso_nfrags;
> +};
> +
> +struct stmmac_napi_tx_stats {
> + u64_stats_t tx_packets;
> + u64_stats_t tx_pkt_n;
> + u64_stats_t poll;
> + u64_stats_t tx_clean;
> + u64_stats_t tx_set_ic_bit;
> +};
> +
> struct stmmac_txq_stats {
> - u64 tx_bytes;
> - u64 tx_packets;
> - u64 tx_pkt_n;
> - u64 tx_normal_irq_n;
> - u64 napi_poll;
> - u64 tx_clean;
> - u64 tx_set_ic_bit;
> - u64 tx_tso_frames;
> - u64 tx_tso_nfrags;
> - struct u64_stats_sync syncp;
> + /* Updates protected by tx queue lock. */
> + struct u64_stats_sync q_syncp;
> + struct stmmac_q_tx_stats q;
> +
> + /* Updates protected by NAPI poll logic. */
> + struct u64_stats_sync napi_syncp;
> + struct stmmac_napi_tx_stats napi;
> } ____cacheline_aligned_in_smp;
>
> +struct stmmac_napi_rx_stats {
> + u64_stats_t rx_bytes;
> + u64_stats_t rx_packets;
> + u64_stats_t rx_pkt_n;
> + u64_stats_t poll;
> +};
> +
> struct stmmac_rxq_stats {
> - u64 rx_bytes;
> - u64 rx_packets;
> - u64 rx_pkt_n;
> - u64 rx_normal_irq_n;
> - u64 napi_poll;
> - struct u64_stats_sync syncp;
> + /* Updates protected by NAPI poll logic. */
> + struct u64_stats_sync napi_syncp;
> + struct stmmac_napi_rx_stats napi;
> } ____cacheline_aligned_in_smp;
>
> +/* Updates on each CPU protected by not allowing nested irqs. */
> +struct stmmac_pcpu_stats {
> + struct u64_stats_sync syncp;
> + u64_stats_t rx_normal_irq_n[MTL_MAX_TX_QUEUES];
> + u64_stats_t tx_normal_irq_n[MTL_MAX_RX_QUEUES];
> +};
> +
> /* Extra statistic and debug information exposed by ethtool */
> struct stmmac_extra_stats {
> /* Transmit errors */
> @@ -205,6 +228,7 @@ struct stmmac_extra_stats {
> /* per queue statistics */
> struct stmmac_txq_stats txq_stats[MTL_MAX_TX_QUEUES];
> struct stmmac_rxq_stats rxq_stats[MTL_MAX_RX_QUEUES];
> + struct stmmac_pcpu_stats __percpu *pcpu_stats;
> unsigned long rx_dropped;
> unsigned long rx_errors;
> unsigned long tx_dropped;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> index 137741b94122..b21d99faa2d0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> @@ -441,8 +441,7 @@ static int sun8i_dwmac_dma_interrupt(struct stmmac_priv *priv,
> struct stmmac_extra_stats *x, u32 chan,
> u32 dir)
> {
> - struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[chan];
> - struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
> + struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
> int ret = 0;
> u32 v;
>
> @@ -455,9 +454,9 @@ static int sun8i_dwmac_dma_interrupt(struct stmmac_priv *priv,
>
> if (v & EMAC_TX_INT) {
> ret |= handle_tx;
> - u64_stats_update_begin(&txq_stats->syncp);
> - txq_stats->tx_normal_irq_n++;
> - u64_stats_update_end(&txq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->tx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> }
>
> if (v & EMAC_TX_DMA_STOP_INT)
> @@ -479,9 +478,9 @@ static int sun8i_dwmac_dma_interrupt(struct stmmac_priv *priv,
>
> if (v & EMAC_RX_INT) {
> ret |= handle_rx;
> - u64_stats_update_begin(&rxq_stats->syncp);
> - rxq_stats->rx_normal_irq_n++;
> - u64_stats_update_end(&rxq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->rx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> }
>
> if (v & EMAC_RX_BUF_UA_INT)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> index 9470d3fd2ded..0d185e54eb7e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> @@ -171,8 +171,7 @@ int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
> const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
> u32 intr_status = readl(ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
> u32 intr_en = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
> - struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[chan];
> - struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
> + struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
> int ret = 0;
>
> if (dir == DMA_DIR_RX)
> @@ -201,15 +200,15 @@ int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
> }
> /* TX/RX NORMAL interrupts */
> if (likely(intr_status & DMA_CHAN_STATUS_RI)) {
> - u64_stats_update_begin(&rxq_stats->syncp);
> - rxq_stats->rx_normal_irq_n++;
> - u64_stats_update_end(&rxq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->rx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_rx;
> }
> if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
> - u64_stats_update_begin(&txq_stats->syncp);
> - txq_stats->tx_normal_irq_n++;
> - u64_stats_update_end(&txq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->tx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_tx;
> }
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
> index 7907d62d3437..85e18f9a22f9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
> @@ -162,8 +162,7 @@ static void show_rx_process_state(unsigned int status)
> int dwmac_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
> struct stmmac_extra_stats *x, u32 chan, u32 dir)
> {
> - struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[chan];
> - struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
> + struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
> int ret = 0;
> /* read the status register (CSR5) */
> u32 intr_status = readl(ioaddr + DMA_STATUS);
> @@ -215,16 +214,16 @@ int dwmac_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
> u32 value = readl(ioaddr + DMA_INTR_ENA);
> /* to schedule NAPI on real RIE event. */
> if (likely(value & DMA_INTR_ENA_RIE)) {
> - u64_stats_update_begin(&rxq_stats->syncp);
> - rxq_stats->rx_normal_irq_n++;
> - u64_stats_update_end(&rxq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->rx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_rx;
> }
> }
> if (likely(intr_status & DMA_STATUS_TI)) {
> - u64_stats_update_begin(&txq_stats->syncp);
> - txq_stats->tx_normal_irq_n++;
> - u64_stats_update_end(&txq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->tx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_tx;
> }
> if (unlikely(intr_status & DMA_STATUS_ERI))
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> index 3cde695fec91..dd2ab6185c40 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> @@ -337,8 +337,7 @@ static int dwxgmac2_dma_interrupt(struct stmmac_priv *priv,
> struct stmmac_extra_stats *x, u32 chan,
> u32 dir)
> {
> - struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[chan];
> - struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
> + struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
> u32 intr_status = readl(ioaddr + XGMAC_DMA_CH_STATUS(chan));
> u32 intr_en = readl(ioaddr + XGMAC_DMA_CH_INT_EN(chan));
> int ret = 0;
> @@ -367,15 +366,15 @@ static int dwxgmac2_dma_interrupt(struct stmmac_priv *priv,
> /* TX/RX NORMAL interrupts */
> if (likely(intr_status & XGMAC_NIS)) {
> if (likely(intr_status & XGMAC_RI)) {
> - u64_stats_update_begin(&rxq_stats->syncp);
> - rxq_stats->rx_normal_irq_n++;
> - u64_stats_update_end(&rxq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->rx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_rx;
> }
> if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
> - u64_stats_update_begin(&txq_stats->syncp);
> - txq_stats->tx_normal_irq_n++;
> - u64_stats_update_end(&txq_stats->syncp);
> + u64_stats_update_begin(&stats->syncp);
> + u64_stats_inc(&stats->tx_normal_irq_n[chan]);
> + u64_stats_update_end(&stats->syncp);
> ret |= handle_tx;
> }
> }
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> index 42d27b97dd1d..ec44becf0e2d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> @@ -549,44 +549,79 @@ stmmac_set_pauseparam(struct net_device *netdev,
> }
> }
>
> +static u64 stmmac_get_rx_normal_irq_n(struct stmmac_priv *priv, int q)
> +{
> + u64 total;
> + int cpu;
> +
> + total = 0;
> + for_each_possible_cpu(cpu) {
> + struct stmmac_pcpu_stats *pcpu;
> + unsigned int start;
> + u64 irq_n;
> +
> + pcpu = per_cpu_ptr(priv->xstats.pcpu_stats, cpu);
> + do {
> + start = u64_stats_fetch_begin(&pcpu->syncp);
> + irq_n = u64_stats_read(&pcpu->rx_normal_irq_n[q]);
> + } while (u64_stats_fetch_retry(&pcpu->syncp, start));
> + total += irq_n;
> + }
> + return total;
> +}
> +
> +static u64 stmmac_get_tx_normal_irq_n(struct stmmac_priv *priv, int q)
> +{
> + u64 total;
> + int cpu;
> +
> + total = 0;
> + for_each_possible_cpu(cpu) {
> + struct stmmac_pcpu_stats *pcpu;
> + unsigned int start;
> + u64 irq_n;
> +
> + pcpu = per_cpu_ptr(priv->xstats.pcpu_stats, cpu);
> + do {
> + start = u64_stats_fetch_begin(&pcpu->syncp);
> + irq_n = u64_stats_read(&pcpu->tx_normal_irq_n[q]);
> + } while (u64_stats_fetch_retry(&pcpu->syncp, start));
> + total += irq_n;
> + }
> + return total;
> +}
> +
> static void stmmac_get_per_qstats(struct stmmac_priv *priv, u64 *data)
> {
> u32 tx_cnt = priv->plat->tx_queues_to_use;
> u32 rx_cnt = priv->plat->rx_queues_to_use;
> unsigned int start;
> - int q, stat;
> - char *p;
> + int q;
>
> for (q = 0; q < tx_cnt; q++) {
> struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[q];
> - struct stmmac_txq_stats snapshot;
> + u64 pkt_n;
>
> do {
> - start = u64_stats_fetch_begin(&txq_stats->syncp);
> - snapshot = *txq_stats;
> - } while (u64_stats_fetch_retry(&txq_stats->syncp, start));
> + start = u64_stats_fetch_begin(&txq_stats->napi_syncp);
> + pkt_n = u64_stats_read(&txq_stats->napi.tx_pkt_n);
> + } while (u64_stats_fetch_retry(&txq_stats->napi_syncp, start));
>
> - p = (char *)&snapshot + offsetof(struct stmmac_txq_stats, tx_pkt_n);
> - for (stat = 0; stat < STMMAC_TXQ_STATS; stat++) {
> - *data++ = (*(u64 *)p);
> - p += sizeof(u64);
> - }
> + *data++ = pkt_n;
> + *data++ = stmmac_get_tx_normal_irq_n(priv, q);
> }
>
> for (q = 0; q < rx_cnt; q++) {
> struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[q];
> - struct stmmac_rxq_stats snapshot;
> + u64 pkt_n;
>
> do {
> - start = u64_stats_fetch_begin(&rxq_stats->syncp);
> - snapshot = *rxq_stats;
> - } while (u64_stats_fetch_retry(&rxq_stats->syncp, start));
> + start = u64_stats_fetch_begin(&rxq_stats->napi_syncp);
> + pkt_n = u64_stats_read(&rxq_stats->napi.rx_pkt_n);
> + } while (u64_stats_fetch_retry(&rxq_stats->napi_syncp, start));
>
> - p = (char *)&snapshot + offsetof(struct stmmac_rxq_stats, rx_pkt_n);
> - for (stat = 0; stat < STMMAC_RXQ_STATS; stat++) {
> - *data++ = (*(u64 *)p);
> - p += sizeof(u64);
> - }
> + *data++ = pkt_n;
> + *data++ = stmmac_get_rx_normal_irq_n(priv, q);
> }
> }
>
> @@ -645,39 +680,49 @@ static void stmmac_get_ethtool_stats(struct net_device *dev,
> pos = j;
> for (i = 0; i < rx_queues_count; i++) {
> struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[i];
> - struct stmmac_rxq_stats snapshot;
> + struct stmmac_napi_rx_stats snapshot;
> + u64 n_irq;
>
> j = pos;
> do {
> - start = u64_stats_fetch_begin(&rxq_stats->syncp);
> - snapshot = *rxq_stats;
> - } while (u64_stats_fetch_retry(&rxq_stats->syncp, start));
> -
> - data[j++] += snapshot.rx_pkt_n;
> - data[j++] += snapshot.rx_normal_irq_n;
> - normal_irq_n += snapshot.rx_normal_irq_n;
> - napi_poll += snapshot.napi_poll;
> + start = u64_stats_fetch_begin(&rxq_stats->napi_syncp);
> + snapshot = rxq_stats->napi;
> + } while (u64_stats_fetch_retry(&rxq_stats->napi_syncp, start));
> +
> + data[j++] += u64_stats_read(&snapshot.rx_pkt_n);
> + n_irq = stmmac_get_rx_normal_irq_n(priv, i);
> + data[j++] += n_irq;
> + normal_irq_n += n_irq;
> + napi_poll += u64_stats_read(&snapshot.poll);
> }
>
> pos = j;
> for (i = 0; i < tx_queues_count; i++) {
> struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[i];
> - struct stmmac_txq_stats snapshot;
> + struct stmmac_napi_tx_stats napi_snapshot;
> + struct stmmac_q_tx_stats q_snapshot;
> + u64 n_irq;
>
> j = pos;
> do {
> - start = u64_stats_fetch_begin(&txq_stats->syncp);
> - snapshot = *txq_stats;
> - } while (u64_stats_fetch_retry(&txq_stats->syncp, start));
> -
> - data[j++] += snapshot.tx_pkt_n;
> - data[j++] += snapshot.tx_normal_irq_n;
> - normal_irq_n += snapshot.tx_normal_irq_n;
> - data[j++] += snapshot.tx_clean;
> - data[j++] += snapshot.tx_set_ic_bit;
> - data[j++] += snapshot.tx_tso_frames;
> - data[j++] += snapshot.tx_tso_nfrags;
> - napi_poll += snapshot.napi_poll;
> + start = u64_stats_fetch_begin(&txq_stats->q_syncp);
> + q_snapshot = txq_stats->q;
> + } while (u64_stats_fetch_retry(&txq_stats->q_syncp, start));
> + do {
> + start = u64_stats_fetch_begin(&txq_stats->napi_syncp);
> + napi_snapshot = txq_stats->napi;
> + } while (u64_stats_fetch_retry(&txq_stats->napi_syncp, start));
> +
> + data[j++] += u64_stats_read(&napi_snapshot.tx_pkt_n);
> + n_irq = stmmac_get_tx_normal_irq_n(priv, i);
> + data[j++] += n_irq;
> + normal_irq_n += n_irq;
> + data[j++] += u64_stats_read(&napi_snapshot.tx_clean);
> + data[j++] += u64_stats_read(&q_snapshot.tx_set_ic_bit) +
> + u64_stats_read(&napi_snapshot.tx_set_ic_bit);
> + data[j++] += u64_stats_read(&q_snapshot.tx_tso_frames);
> + data[j++] += u64_stats_read(&q_snapshot.tx_tso_nfrags);
> + napi_poll += u64_stats_read(&napi_snapshot.poll);
> }
> normal_irq_n += priv->xstats.rx_early_irq;
> data[j++] = normal_irq_n;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index a0e46369ae15..530ee7ccae9a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -2482,7 +2482,6 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
> struct xdp_desc xdp_desc;
> bool work_done = true;
> u32 tx_set_ic_bit = 0;
> - unsigned long flags;
>
> /* Avoids TX time-out as we are sharing with slow path */
> txq_trans_cond_update(nq);
> @@ -2566,9 +2565,9 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
> tx_q->cur_tx = STMMAC_GET_ENTRY(tx_q->cur_tx, priv->dma_conf.dma_tx_size);
> entry = tx_q->cur_tx;
> }
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->tx_set_ic_bit += tx_set_ic_bit;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_update_begin(&txq_stats->napi_syncp);
> + u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
> + u64_stats_update_end(&txq_stats->napi_syncp);
>
> if (tx_desc) {
> stmmac_flush_tx_descriptors(priv, queue);
> @@ -2616,7 +2615,6 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue,
> unsigned int bytes_compl = 0, pkts_compl = 0;
> unsigned int entry, xmits = 0, count = 0;
> u32 tx_packets = 0, tx_errors = 0;
> - unsigned long flags;
>
> __netif_tx_lock_bh(netdev_get_tx_queue(priv->dev, queue));
>
> @@ -2782,11 +2780,11 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue,
> if (tx_q->dirty_tx != tx_q->cur_tx)
> *pending_packets = true;
>
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->tx_packets += tx_packets;
> - txq_stats->tx_pkt_n += tx_packets;
> - txq_stats->tx_clean++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_update_begin(&txq_stats->napi_syncp);
> + u64_stats_add(&txq_stats->napi.tx_packets, tx_packets);
> + u64_stats_add(&txq_stats->napi.tx_pkt_n, tx_packets);
> + u64_stats_inc(&txq_stats->napi.tx_clean);
> + u64_stats_update_end(&txq_stats->napi_syncp);
>
> priv->xstats.tx_errors += tx_errors;
>
> @@ -4210,7 +4208,6 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
> struct stmmac_tx_queue *tx_q;
> bool has_vlan, set_ic;
> u8 proto_hdr_len, hdr;
> - unsigned long flags;
> u32 pay_len, mss;
> dma_addr_t des;
> int i;
> @@ -4375,13 +4372,13 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
> netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
> }
>
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->tx_bytes += skb->len;
> - txq_stats->tx_tso_frames++;
> - txq_stats->tx_tso_nfrags += nfrags;
> + u64_stats_update_begin(&txq_stats->q_syncp);
> + u64_stats_add(&txq_stats->q.tx_bytes, skb->len);
> + u64_stats_inc(&txq_stats->q.tx_tso_frames);
> + u64_stats_add(&txq_stats->q.tx_tso_nfrags, nfrags);
> if (set_ic)
> - txq_stats->tx_set_ic_bit++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
> + u64_stats_update_end(&txq_stats->q_syncp);
>
> if (priv->sarc_type)
> stmmac_set_desc_sarc(priv, first, priv->sarc_type);
> @@ -4480,7 +4477,6 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
> struct stmmac_tx_queue *tx_q;
> bool has_vlan, set_ic;
> int entry, first_tx;
> - unsigned long flags;
> dma_addr_t des;
>
> tx_q = &priv->dma_conf.tx_queue[queue];
> @@ -4650,11 +4646,11 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
> netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
> }
>
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->tx_bytes += skb->len;
> + u64_stats_update_begin(&txq_stats->q_syncp);
> + u64_stats_add(&txq_stats->q.tx_bytes, skb->len);
> if (set_ic)
> - txq_stats->tx_set_ic_bit++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
> + u64_stats_update_end(&txq_stats->q_syncp);
>
> if (priv->sarc_type)
> stmmac_set_desc_sarc(priv, first, priv->sarc_type);
> @@ -4918,12 +4914,11 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
> set_ic = false;
>
> if (set_ic) {
> - unsigned long flags;
> tx_q->tx_count_frames = 0;
> stmmac_set_tx_ic(priv, tx_desc);
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->tx_set_ic_bit++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_update_begin(&txq_stats->q_syncp);
> + u64_stats_inc(&txq_stats->q.tx_set_ic_bit);
> + u64_stats_update_end(&txq_stats->q_syncp);
> }
>
> stmmac_enable_dma_transmission(priv, priv->ioaddr);
> @@ -5073,7 +5068,6 @@ static void stmmac_dispatch_skb_zc(struct stmmac_priv *priv, u32 queue,
> unsigned int len = xdp->data_end - xdp->data;
> enum pkt_hash_types hash_type;
> int coe = priv->hw->rx_csum;
> - unsigned long flags;
> struct sk_buff *skb;
> u32 hash;
>
> @@ -5103,10 +5097,10 @@ static void stmmac_dispatch_skb_zc(struct stmmac_priv *priv, u32 queue,
> skb_record_rx_queue(skb, queue);
> napi_gro_receive(&ch->rxtx_napi, skb);
>
> - flags = u64_stats_update_begin_irqsave(&rxq_stats->syncp);
> - rxq_stats->rx_pkt_n++;
> - rxq_stats->rx_bytes += len;
> - u64_stats_update_end_irqrestore(&rxq_stats->syncp, flags);
> + u64_stats_update_begin(&rxq_stats->napi_syncp);
> + u64_stats_inc(&rxq_stats->napi.rx_pkt_n);
> + u64_stats_add(&rxq_stats->napi.rx_bytes, len);
> + u64_stats_update_end(&rxq_stats->napi_syncp);
> }
>
> static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
> @@ -5188,7 +5182,6 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
> unsigned int desc_size;
> struct bpf_prog *prog;
> bool failure = false;
> - unsigned long flags;
> int xdp_status = 0;
> int status = 0;
>
> @@ -5343,9 +5336,9 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
>
> stmmac_finalize_xdp_rx(priv, xdp_status);
>
> - flags = u64_stats_update_begin_irqsave(&rxq_stats->syncp);
> - rxq_stats->rx_pkt_n += count;
> - u64_stats_update_end_irqrestore(&rxq_stats->syncp, flags);
> + u64_stats_update_begin(&rxq_stats->napi_syncp);
> + u64_stats_add(&rxq_stats->napi.rx_pkt_n, count);
> + u64_stats_update_end(&rxq_stats->napi_syncp);
>
> priv->xstats.rx_dropped += rx_dropped;
> priv->xstats.rx_errors += rx_errors;
> @@ -5383,7 +5376,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
> unsigned int desc_size;
> struct sk_buff *skb = NULL;
> struct stmmac_xdp_buff ctx;
> - unsigned long flags;
> int xdp_status = 0;
> int buf_sz;
>
> @@ -5643,11 +5635,11 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
>
> stmmac_rx_refill(priv, queue);
>
> - flags = u64_stats_update_begin_irqsave(&rxq_stats->syncp);
> - rxq_stats->rx_packets += rx_packets;
> - rxq_stats->rx_bytes += rx_bytes;
> - rxq_stats->rx_pkt_n += count;
> - u64_stats_update_end_irqrestore(&rxq_stats->syncp, flags);
> + u64_stats_update_begin(&rxq_stats->napi_syncp);
> + u64_stats_add(&rxq_stats->napi.rx_packets, rx_packets);
> + u64_stats_add(&rxq_stats->napi.rx_bytes, rx_bytes);
> + u64_stats_add(&rxq_stats->napi.rx_pkt_n, count);
> + u64_stats_update_end(&rxq_stats->napi_syncp);
>
> priv->xstats.rx_dropped += rx_dropped;
> priv->xstats.rx_errors += rx_errors;
> @@ -5662,13 +5654,12 @@ static int stmmac_napi_poll_rx(struct napi_struct *napi, int budget)
> struct stmmac_priv *priv = ch->priv_data;
> struct stmmac_rxq_stats *rxq_stats;
> u32 chan = ch->index;
> - unsigned long flags;
> int work_done;
>
> rxq_stats = &priv->xstats.rxq_stats[chan];
> - flags = u64_stats_update_begin_irqsave(&rxq_stats->syncp);
> - rxq_stats->napi_poll++;
> - u64_stats_update_end_irqrestore(&rxq_stats->syncp, flags);
> + u64_stats_update_begin(&rxq_stats->napi_syncp);
> + u64_stats_inc(&rxq_stats->napi.poll);
> + u64_stats_update_end(&rxq_stats->napi_syncp);
>
> work_done = stmmac_rx(priv, budget, chan);
> if (work_done < budget && napi_complete_done(napi, work_done)) {
> @@ -5690,13 +5681,12 @@ static int stmmac_napi_poll_tx(struct napi_struct *napi, int budget)
> struct stmmac_txq_stats *txq_stats;
> bool pending_packets = false;
> u32 chan = ch->index;
> - unsigned long flags;
> int work_done;
>
> txq_stats = &priv->xstats.txq_stats[chan];
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->napi_poll++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_update_begin(&txq_stats->napi_syncp);
> + u64_stats_inc(&txq_stats->napi.poll);
> + u64_stats_update_end(&txq_stats->napi_syncp);
>
> work_done = stmmac_tx_clean(priv, budget, chan, &pending_packets);
> work_done = min(work_done, budget);
> @@ -5726,17 +5716,16 @@ static int stmmac_napi_poll_rxtx(struct napi_struct *napi, int budget)
> struct stmmac_rxq_stats *rxq_stats;
> struct stmmac_txq_stats *txq_stats;
> u32 chan = ch->index;
> - unsigned long flags;
>
> rxq_stats = &priv->xstats.rxq_stats[chan];
> - flags = u64_stats_update_begin_irqsave(&rxq_stats->syncp);
> - rxq_stats->napi_poll++;
> - u64_stats_update_end_irqrestore(&rxq_stats->syncp, flags);
> + u64_stats_update_begin(&rxq_stats->napi_syncp);
> + u64_stats_inc(&rxq_stats->napi.poll);
> + u64_stats_update_end(&rxq_stats->napi_syncp);
>
> txq_stats = &priv->xstats.txq_stats[chan];
> - flags = u64_stats_update_begin_irqsave(&txq_stats->syncp);
> - txq_stats->napi_poll++;
> - u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
> + u64_stats_update_begin(&txq_stats->napi_syncp);
> + u64_stats_inc(&txq_stats->napi.poll);
> + u64_stats_update_end(&txq_stats->napi_syncp);
>
> tx_done = stmmac_tx_clean(priv, budget, chan, &tx_pending_packets);
> tx_done = min(tx_done, budget);
> @@ -7062,10 +7051,13 @@ static void stmmac_get_stats64(struct net_device *dev, struct rtnl_link_stats64
> u64 tx_bytes;
>
> do {
> - start = u64_stats_fetch_begin(&txq_stats->syncp);
> - tx_packets = txq_stats->tx_packets;
> - tx_bytes = txq_stats->tx_bytes;
> - } while (u64_stats_fetch_retry(&txq_stats->syncp, start));
> + start = u64_stats_fetch_begin(&txq_stats->q_syncp);
> + tx_bytes = u64_stats_read(&txq_stats->q.tx_bytes);
> + } while (u64_stats_fetch_retry(&txq_stats->q_syncp, start));
> + do {
> + start = u64_stats_fetch_begin(&txq_stats->napi_syncp);
> + tx_packets = u64_stats_read(&txq_stats->napi.tx_packets);
> + } while (u64_stats_fetch_retry(&txq_stats->napi_syncp, start));
>
> stats->tx_packets += tx_packets;
> stats->tx_bytes += tx_bytes;
> @@ -7077,10 +7069,10 @@ static void stmmac_get_stats64(struct net_device *dev, struct rtnl_link_stats64
> u64 rx_bytes;
>
> do {
> - start = u64_stats_fetch_begin(&rxq_stats->syncp);
> - rx_packets = rxq_stats->rx_packets;
> - rx_bytes = rxq_stats->rx_bytes;
> - } while (u64_stats_fetch_retry(&rxq_stats->syncp, start));
> + start = u64_stats_fetch_begin(&rxq_stats->napi_syncp);
> + rx_packets = u64_stats_read(&rxq_stats->napi.rx_packets);
> + rx_bytes = u64_stats_read(&rxq_stats->napi.rx_bytes);
> + } while (u64_stats_fetch_retry(&rxq_stats->napi_syncp, start));
>
> stats->rx_packets += rx_packets;
> stats->rx_bytes += rx_bytes;
> @@ -7474,9 +7466,15 @@ int stmmac_dvr_probe(struct device *device,
> priv->dev = ndev;
>
> for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
> - u64_stats_init(&priv->xstats.rxq_stats[i].syncp);
> - for (i = 0; i < MTL_MAX_TX_QUEUES; i++)
> - u64_stats_init(&priv->xstats.txq_stats[i].syncp);
> + u64_stats_init(&priv->xstats.rxq_stats[i].napi_syncp);
> + for (i = 0; i < MTL_MAX_TX_QUEUES; i++) {
> + u64_stats_init(&priv->xstats.txq_stats[i].q_syncp);
> + u64_stats_init(&priv->xstats.txq_stats[i].napi_syncp);
> + }
> +
> + priv->xstats.pcpu_stats = netdev_alloc_pcpu_stats(struct stmmac_pcpu_stats);
devm_netdev_alloc_pcpu_stats to simplify error and exit code path.
> + if (!priv->xstats.pcpu_stats)
> + return -ENOMEM;
>
> stmmac_set_ethtool_ops(ndev);
> priv->pause = pause;
> @@ -7505,8 +7503,10 @@ int stmmac_dvr_probe(struct device *device,
> stmmac_verify_args();
>
> priv->af_xdp_zc_qps = bitmap_zalloc(MTL_MAX_TX_QUEUES, GFP_KERNEL);
> - if (!priv->af_xdp_zc_qps)
> - return -ENOMEM;
> + if (!priv->af_xdp_zc_qps) {
> + ret = -ENOMEM;
> + goto error_xdp_init;
> + }
>
> /* Allocate workqueue */
> priv->wq = create_singlethread_workqueue("stmmac_wq");
> @@ -7762,6 +7762,8 @@ int stmmac_dvr_probe(struct device *device,
> destroy_workqueue(priv->wq);
> error_wq_init:
> bitmap_free(priv->af_xdp_zc_qps);
> +error_xdp_init:
> + free_percpu(priv->xstats.pcpu_stats);
>
> return ret;
> }
> @@ -7800,6 +7802,7 @@ void stmmac_dvr_remove(struct device *dev)
> destroy_workqueue(priv->wq);
> mutex_destroy(&priv->lock);
> bitmap_free(priv->af_xdp_zc_qps);
> + free_percpu(priv->xstats.pcpu_stats);
>
> pm_runtime_disable(dev);
> pm_runtime_put_noidle(dev);
> --
> 2.43.0
>
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