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Message-ID: <ba93bc2a-b02a-419a-b39f-6fc7470c50a5@amd.com>
Date: Thu, 31 Oct 2024 09:57:36 -0700
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Caleb Sander Mateos <csander@...estorage.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Arthur Kiyanovski <akiyano@...zon.com>, Brett Creeley
<brett.creeley@....com>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@...adcom.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Claudiu Manoil <claudiu.manoil@....com>, David Arinzon
<darinzon@...zon.com>, "David S. Miller" <davem@...emloft.net>,
Doug Berger <opendmb@...il.com>, Eric Dumazet <edumazet@...gle.com>,
Eugenio Pérez <eperezma@...hat.com>,
Felix Fietkau <nbd@....name>,
Florian Fainelli <florian.fainelli@...adcom.com>,
Geetha sowjanya <gakula@...vell.com>, hariprasad <hkelam@...vell.com>,
Jakub Kicinski <kuba@...nel.org>, Jason Wang <jasowang@...hat.com>,
Jonathan Corbet <corbet@....net>, Leon Romanovsky <leon@...nel.org>,
Lorenzo Bianconi <lorenzo@...nel.org>, Louis Peens
<louis.peens@...igine.com>, Mark Lee <Mark-MC.Lee@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Michael Chan <michael.chan@...adcom.com>, "Michael S. Tsirkin"
<mst@...hat.com>, Noam Dagan <ndagan@...zon.com>,
Paolo Abeni <pabeni@...hat.com>,
Przemek Kitszel <przemyslaw.kitszel@...el.com>,
Roy Pledge <Roy.Pledge@....com>, Saeed Bishara <saeedb@...zon.com>,
Saeed Mahameed <saeedm@...dia.com>, Sean Wang <sean.wang@...iatek.com>,
Shay Agroskin <shayagr@...zon.com>, Simon Horman <horms@...nel.org>,
Subbaraya Sundeep <sbhatta@...vell.com>, Sunil Goutham
<sgoutham@...vell.com>, Tal Gilboa <talgi@...dia.com>,
Tariq Toukan <tariqt@...dia.com>, Tony Nguyen <anthony.l.nguyen@...el.com>,
Vladimir Oltean <vladimir.oltean@....com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: intel-wired-lan@...ts.osuosl.org, linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mediatek@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
oss-drivers@...igine.com, virtualization@...ts.linux.dev
Subject: Re: [resend PATCH 2/2] dim: pass dim_sample to net_dim() by reference
On 10/30/2024 5:23 PM, Caleb Sander Mateos wrote:
>
> net_dim() is currently passed a struct dim_sample argument by value.
> struct dim_sample is 24 bytes. Since this is greater 16 bytes, x86-64
> passes it on the stack. All callers have already initialized dim_sample
> on the stack, so passing it by value requires pushing a duplicated copy
> to the stack. Either witing to the stack and immediately reading it, or
> perhaps dereferencing addresses relative to the stack pointer in a chain
> of push instructions, seems to perform quite poorly.
>
> In a heavy TCP workload, mlx5e_handle_rx_dim() consumes 3% of CPU time,
> 94% of which is attributed to the first push instruction to copy
> dim_sample on the stack for the call to net_dim():
> // Call ktime_get()
> 0.26 |4ead2: call 4ead7 <mlx5e_handle_rx_dim+0x47>
> // Pass the address of struct dim in %rdi
> |4ead7: lea 0x3d0(%rbx),%rdi
> // Set dim_sample.pkt_ctr
> |4eade: mov %r13d,0x8(%rsp)
> // Set dim_sample.byte_ctr
> |4eae3: mov %r12d,0xc(%rsp)
> // Set dim_sample.event_ctr
> 0.15 |4eae8: mov %bp,0x10(%rsp)
> // Duplicate dim_sample on the stack
> 94.16 |4eaed: push 0x10(%rsp)
> 2.79 |4eaf1: push 0x10(%rsp)
> 0.07 |4eaf5: push %rax
> // Call net_dim()
> 0.21 |4eaf6: call 4eafb <mlx5e_handle_rx_dim+0x6b>
>
> To allow the caller to reuse the struct dim_sample already on the stack,
> pass the struct dim_sample by reference to net_dim().
>
> Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
> ---
> Documentation/networking/net_dim.rst | 2 +-
> drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +-
> drivers/net/ethernet/broadcom/bcmsysport.c | 2 +-
> drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 ++--
> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 2 +-
> drivers/net/ethernet/freescale/enetc/enetc.c | 2 +-
> drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 4 ++--
> drivers/net/ethernet/intel/ice/ice_txrx.c | 4 ++--
> drivers/net/ethernet/intel/idpf/idpf_txrx.c | 4 ++--
> drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c | 2 +-
> drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 ++--
> drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c | 4 ++--
> drivers/net/ethernet/netronome/nfp/nfd3/dp.c | 4 ++--
> drivers/net/ethernet/netronome/nfp/nfdk/dp.c | 4 ++--
> drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 2 +-
for the pensando/ionic bits:
Reviewed-by: Shannon Nelson <shannon.nelson@....com>
> drivers/net/virtio_net.c | 2 +-
> drivers/soc/fsl/dpio/dpio-service.c | 2 +-
> include/linux/dim.h | 2 +-
> lib/dim/net_dim.c | 10 +++++-----
> 19 files changed, 31 insertions(+), 31 deletions(-)
>
> diff --git a/Documentation/networking/net_dim.rst b/Documentation/networking/net_dim.rst
> index 8908fd7b0a8d..4377998e6826 100644
> --- a/Documentation/networking/net_dim.rst
> +++ b/Documentation/networking/net_dim.rst
> @@ -154,11 +154,11 @@ usage is not complete but it should make the outline of the usage clear.
> dim_update_sample(my_entity->events,
> my_entity->packets,
> my_entity->bytes,
> &dim_sample);
> /* Call net DIM */
> - net_dim(&my_entity->dim, dim_sample);
> + net_dim(&my_entity->dim, &dim_sample);
> ...
> }
>
> /* My entity's initialization function (my_entity was already allocated) */
> int my_driver_init_my_entity(struct my_driver_entity *my_entity, ...)
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index 96df20854eb9..63c8a2328142 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -1381,11 +1381,11 @@ static void ena_adjust_adaptive_rx_intr_moderation(struct ena_napi *ena_napi)
> dim_update_sample(rx_ring->non_empty_napi_events,
> rx_ring->rx_stats.cnt,
> rx_ring->rx_stats.bytes,
> &dim_sample);
>
> - net_dim(&ena_napi->dim, dim_sample);
> + net_dim(&ena_napi->dim, &dim_sample);
>
> rx_ring->per_napi_packets = 0;
> }
>
> void ena_unmask_interrupt(struct ena_ring *tx_ring,
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index caff6e87a488..031e9e0cca53 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -1027,11 +1027,11 @@ static int bcm_sysport_poll(struct napi_struct *napi, int budget)
> }
>
> if (priv->dim.use_dim) {
> dim_update_sample(priv->dim.event_ctr, priv->dim.packets,
> priv->dim.bytes, &dim_sample);
> - net_dim(&priv->dim.dim, dim_sample);
> + net_dim(&priv->dim.dim, &dim_sample);
> }
>
> return work_done;
> }
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> index 6dd6541d8619..ca42b81133d7 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -3100,11 +3100,11 @@ static int bnxt_poll(struct napi_struct *napi, int budget)
>
> dim_update_sample(cpr->event_ctr,
> cpr->rx_packets,
> cpr->rx_bytes,
> &dim_sample);
> - net_dim(&cpr->dim, dim_sample);
> + net_dim(&cpr->dim, &dim_sample);
> }
> return work_done;
> }
>
> static int __bnxt_poll_cqs(struct bnxt *bp, struct bnxt_napi *bnapi, int budget)
> @@ -3231,11 +3231,11 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget)
>
> dim_update_sample(cpr->event_ctr,
> cpr_rx->rx_packets,
> cpr_rx->rx_bytes,
> &dim_sample);
> - net_dim(&cpr->dim, dim_sample);
> + net_dim(&cpr->dim, &dim_sample);
> }
> return work_done;
> }
>
> static void bnxt_free_tx_skbs(struct bnxt *bp)
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 10966ab15373..53a949eb9180 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -2403,11 +2403,11 @@ static int bcmgenet_rx_poll(struct napi_struct *napi, int budget)
> }
>
> if (ring->dim.use_dim) {
> dim_update_sample(ring->dim.event_ctr, ring->dim.packets,
> ring->dim.bytes, &dim_sample);
> - net_dim(&ring->dim.dim, dim_sample);
> + net_dim(&ring->dim.dim, &dim_sample);
> }
>
> return work_done;
> }
>
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
> index c09370eab319..05dedea6185a 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -716,11 +716,11 @@ static void enetc_rx_net_dim(struct enetc_int_vector *v)
>
> dim_update_sample(v->comp_cnt,
> v->rx_ring.stats.packets,
> v->rx_ring.stats.bytes,
> &dim_sample);
> - net_dim(&v->rx_dim, dim_sample);
> + net_dim(&v->rx_dim, &dim_sample);
> }
>
> static int enetc_bd_ready_count(struct enetc_bdr *tx_ring, int ci)
> {
> int pi = enetc_rd_reg_hot(tx_ring->tcir) & ENETC_TBCIR_IDX_MASK;
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 4cbc4d069a1f..43377a7b2426 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> @@ -4446,11 +4446,11 @@ static void hns3_update_rx_int_coalesce(struct hns3_enet_tqp_vector *tqp_vector)
> if (!rx_group->coal.adapt_enable)
> return;
>
> dim_update_sample(tqp_vector->event_cnt, rx_group->total_packets,
> rx_group->total_bytes, &sample);
> - net_dim(&rx_group->dim, sample);
> + net_dim(&rx_group->dim, &sample);
> }
>
> static void hns3_update_tx_int_coalesce(struct hns3_enet_tqp_vector *tqp_vector)
> {
> struct hns3_enet_ring_group *tx_group = &tqp_vector->tx_group;
> @@ -4459,11 +4459,11 @@ static void hns3_update_tx_int_coalesce(struct hns3_enet_tqp_vector *tqp_vector)
> if (!tx_group->coal.adapt_enable)
> return;
>
> dim_update_sample(tqp_vector->event_cnt, tx_group->total_packets,
> tx_group->total_bytes, &sample);
> - net_dim(&tx_group->dim, sample);
> + net_dim(&tx_group->dim, &sample);
> }
>
> static int hns3_nic_common_poll(struct napi_struct *napi, int budget)
> {
> struct hns3_nic_priv *priv = netdev_priv(napi->dev);
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
> index 8208055d6e7f..5d2d7736fd5f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
> @@ -1350,18 +1350,18 @@ static void ice_net_dim(struct ice_q_vector *q_vector)
>
> if (ITR_IS_DYNAMIC(tx)) {
> struct dim_sample dim_sample;
>
> __ice_update_sample(q_vector, tx, &dim_sample, true);
> - net_dim(&tx->dim, dim_sample);
> + net_dim(&tx->dim, &dim_sample);
> }
>
> if (ITR_IS_DYNAMIC(rx)) {
> struct dim_sample dim_sample;
>
> __ice_update_sample(q_vector, rx, &dim_sample, false);
> - net_dim(&rx->dim, dim_sample);
> + net_dim(&rx->dim, &dim_sample);
> }
> }
>
> /**
> * ice_buildreg_itr - build value for writing to the GLINT_DYN_CTL register
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> index d4e6f0e10487..da2a5becf62f 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> @@ -3677,11 +3677,11 @@ static void idpf_net_dim(struct idpf_q_vector *q_vector)
> } while (u64_stats_fetch_retry(&txq->stats_sync, start));
> }
>
> idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->tx_dim,
> packets, bytes);
> - net_dim(&q_vector->tx_dim, dim_sample);
> + net_dim(&q_vector->tx_dim, &dim_sample);
>
> check_rx_itr:
> if (!IDPF_ITR_IS_DYNAMIC(q_vector->rx_intr_mode))
> return;
>
> @@ -3696,11 +3696,11 @@ static void idpf_net_dim(struct idpf_q_vector *q_vector)
> } while (u64_stats_fetch_retry(&rxq->stats_sync, start));
> }
>
> idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->rx_dim,
> packets, bytes);
> - net_dim(&q_vector->rx_dim, dim_sample);
> + net_dim(&q_vector->rx_dim, &dim_sample);
> }
>
> /**
> * idpf_vport_intr_update_itr_ena_irq - Update itr and re-enable MSIX interrupt
> * @q_vector: q_vector for which itr is being updated and interrupt enabled
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> index 933e18ba2fb2..7aaf32e9aa95 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> @@ -525,11 +525,11 @@ static void otx2_adjust_adaptive_coalese(struct otx2_nic *pfvf, struct otx2_cq_p
>
> dim_update_sample(pfvf->napi_events,
> rx_frames + tx_frames,
> rx_bytes + tx_bytes,
> &dim_sample);
> - net_dim(&cq_poll->dim, dim_sample);
> + net_dim(&cq_poll->dim, &dim_sample);
> }
>
> int otx2_napi_handler(struct napi_struct *napi, int budget)
> {
> struct otx2_cq_queue *rx_cq = NULL;
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index f01ceee5f02d..53485142938c 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -2225,11 +2225,11 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
>
> eth->rx_packets += done;
> eth->rx_bytes += bytes;
> dim_update_sample(eth->rx_events, eth->rx_packets, eth->rx_bytes,
> &dim_sample);
> - net_dim(ð->rx_dim, dim_sample);
> + net_dim(ð->rx_dim, &dim_sample);
>
> if (xdp_flush)
> xdp_do_flush();
>
> return done;
> @@ -2375,11 +2375,11 @@ static int mtk_poll_tx(struct mtk_eth *eth, int budget)
> if (state.txq)
> netdev_tx_completed_queue(state.txq, state.done, state.bytes);
>
> dim_update_sample(eth->tx_events, eth->tx_packets, eth->tx_bytes,
> &dim_sample);
> - net_dim(ð->tx_dim, dim_sample);
> + net_dim(ð->tx_dim, &dim_sample);
>
> if (mtk_queue_stopped(eth) &&
> (atomic_read(&ring->free_count) > ring->thresh))
> mtk_wake_queue(eth);
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
> index 5873fde65c2e..417098f0b2bb 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
> @@ -53,11 +53,11 @@ static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
>
> if (unlikely(!test_bit(MLX5E_SQ_STATE_DIM, &sq->state)))
> return;
>
> dim_update_sample(sq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
> - net_dim(sq->dim, dim_sample);
> + net_dim(sq->dim, &dim_sample);
> }
>
> static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
> {
> struct mlx5e_rq_stats *stats = rq->stats;
> @@ -65,11 +65,11 @@ static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
>
> if (unlikely(!test_bit(MLX5E_RQ_STATE_DIM, &rq->state)))
> return;
>
> dim_update_sample(rq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
> - net_dim(rq->dim, dim_sample);
> + net_dim(rq->dim, &dim_sample);
> }
>
> void mlx5e_trigger_irq(struct mlx5e_icosq *sq)
> {
> struct mlx5_wq_cyc *wq = &sq->wq;
> diff --git a/drivers/net/ethernet/netronome/nfp/nfd3/dp.c b/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
> index d215efc6cad0..f1c6c47564b1 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
> @@ -1177,11 +1177,11 @@ int nfp_nfd3_poll(struct napi_struct *napi, int budget)
> pkts = r_vec->rx_pkts;
> bytes = r_vec->rx_bytes;
> } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
>
> dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
> - net_dim(&r_vec->rx_dim, dim_sample);
> + net_dim(&r_vec->rx_dim, &dim_sample);
> }
>
> if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
> struct dim_sample dim_sample = {};
> unsigned int start;
> @@ -1192,11 +1192,11 @@ int nfp_nfd3_poll(struct napi_struct *napi, int budget)
> pkts = r_vec->tx_pkts;
> bytes = r_vec->tx_bytes;
> } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
>
> dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
> - net_dim(&r_vec->tx_dim, dim_sample);
> + net_dim(&r_vec->tx_dim, &dim_sample);
> }
>
> return pkts_polled;
> }
>
> diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
> index dae5af7d1845..ebeb6ab4465c 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
> @@ -1287,11 +1287,11 @@ int nfp_nfdk_poll(struct napi_struct *napi, int budget)
> pkts = r_vec->rx_pkts;
> bytes = r_vec->rx_bytes;
> } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
>
> dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
> - net_dim(&r_vec->rx_dim, dim_sample);
> + net_dim(&r_vec->rx_dim, &dim_sample);
> }
>
> if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
> struct dim_sample dim_sample = {};
> unsigned int start;
> @@ -1302,11 +1302,11 @@ int nfp_nfdk_poll(struct napi_struct *napi, int budget)
> pkts = r_vec->tx_pkts;
> bytes = r_vec->tx_bytes;
> } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
>
> dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
> - net_dim(&r_vec->tx_dim, dim_sample);
> + net_dim(&r_vec->tx_dim, &dim_sample);
> }
>
> return pkts_polled;
> }
>
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> index 0eeda7e502db..2ac59564ded1 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> @@ -926,11 +926,11 @@ static void ionic_dim_update(struct ionic_qcq *qcq, int napi_mode)
> }
>
> dim_update_sample(qcq->cq.bound_intr->rearm_count,
> pkts, bytes, &dim_sample);
>
> - net_dim(&qcq->dim, dim_sample);
> + net_dim(&qcq->dim, &dim_sample);
> }
>
> int ionic_tx_napi(struct napi_struct *napi, int budget)
> {
> struct ionic_qcq *qcq = napi_to_qcq(napi);
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 792e9eadbfc3..869586c17ffd 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2802,11 +2802,11 @@ static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue
> dim_update_sample(rq->calls,
> u64_stats_read(&rq->stats.packets),
> u64_stats_read(&rq->stats.bytes),
> &cur_sample);
>
> - net_dim(&rq->dim, cur_sample);
> + net_dim(&rq->dim, &cur_sample);
> rq->packets_in_napi = 0;
> }
>
> static int virtnet_poll(struct napi_struct *napi, int budget)
> {
> diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
> index b811446e0fa5..0b60ed16297c 100644
> --- a/drivers/soc/fsl/dpio/dpio-service.c
> +++ b/drivers/soc/fsl/dpio/dpio-service.c
> @@ -889,10 +889,10 @@ void dpaa2_io_update_net_dim(struct dpaa2_io *d, __u64 frames, __u64 bytes)
>
> d->bytes += bytes;
> d->frames += frames;
>
> dim_update_sample(d->event_ctr, d->frames, d->bytes, &dim_sample);
> - net_dim(&d->rx_dim, dim_sample);
> + net_dim(&d->rx_dim, &dim_sample);
>
> spin_unlock(&d->dim_lock);
> }
> EXPORT_SYMBOL(dpaa2_io_update_net_dim);
> diff --git a/include/linux/dim.h b/include/linux/dim.h
> index 84579a50ae7f..06543fd40fcc 100644
> --- a/include/linux/dim.h
> +++ b/include/linux/dim.h
> @@ -423,11 +423,11 @@ struct dim_cq_moder net_dim_get_def_tx_moderation(u8 cq_period_mode);
> *
> * Called by the consumer.
> * This is the main logic of the algorithm, where data is processed in order
> * to decide on next required action.
> */
> -void net_dim(struct dim *dim, struct dim_sample end_sample);
> +void net_dim(struct dim *dim, const struct dim_sample *end_sample);
>
> /* RDMA DIM */
>
> /*
> * RDMA DIM profile:
> diff --git a/lib/dim/net_dim.c b/lib/dim/net_dim.c
> index d7e7028e9b19..d6aa09a979b3 100644
> --- a/lib/dim/net_dim.c
> +++ b/lib/dim/net_dim.c
> @@ -345,33 +345,33 @@ static bool net_dim_decision(struct dim_stats *curr_stats, struct dim *dim)
> dim->prev_stats = *curr_stats;
>
> return dim->profile_ix != prev_ix;
> }
>
> -void net_dim(struct dim *dim, struct dim_sample end_sample)
> +void net_dim(struct dim *dim, const struct dim_sample *end_sample)
> {
> struct dim_stats curr_stats;
> u16 nevents;
>
> switch (dim->state) {
> case DIM_MEASURE_IN_PROGRESS:
> nevents = BIT_GAP(BITS_PER_TYPE(u16),
> - end_sample.event_ctr,
> + end_sample->event_ctr,
> dim->start_sample.event_ctr);
> if (nevents < DIM_NEVENTS)
> break;
> - if (!dim_calc_stats(&dim->start_sample, &end_sample, &curr_stats))
> + if (!dim_calc_stats(&dim->start_sample, end_sample, &curr_stats))
> break;
> if (net_dim_decision(&curr_stats, dim)) {
> dim->state = DIM_APPLY_NEW_PROFILE;
> schedule_work(&dim->work);
> break;
> }
> fallthrough;
> case DIM_START_MEASURE:
> - dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr,
> - end_sample.byte_ctr, &dim->start_sample);
> + dim_update_sample(end_sample->event_ctr, end_sample->pkt_ctr,
> + end_sample->byte_ctr, &dim->start_sample);
> dim->state = DIM_MEASURE_IN_PROGRESS;
> break;
> case DIM_APPLY_NEW_PROFILE:
> break;
> }
> --
> 2.45.2
>
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