[PATCH iwl-next v5 1/2] i40e: move ATR sample rate from ring to PF level
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HOTtoday
From: <hidden>
Date: 2026-10-08 13:18:59
Also in:
intel-wired-lan
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Mohammad Heib <redacted> The ATR sample rate is currently stored per-ring and initialized when each TX ring is configured. Since the sample rate is a global policy that applies uniformly across all rings, it makes more sense to store it at the PF level. Move atr_sample_rate from struct i40e_ring to struct i40e_pf and initialize it once during i40e_sw_init(). Update i40e_atr() to reference the PF-level field. Change atr_count from u8 to u32 to match the sample rate type. This also changes a user-visible behavior: previously, re-enabling ATR via "ethtool --set-priv-flags ethX flow-director-atr on" did not resume sampling until an ifdown/ifup or PF reset, because the per-ring sample rate was latched at ring configuration time. With the PF-level rate always initialized, the flag takes effect immediately. Trigger a PF reset when re-enabling ATR so that fd_ena is re-evaluated in the TX queue HW context. Signed-off-by: Mohammad Heib <redacted> --- drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 12 +++++++++++- drivers/net/ethernet/intel/i40e/i40e_main.c | 9 +++------ drivers/net/ethernet/intel/i40e/i40e_txrx.c | 6 ++++-- drivers/net/ethernet/intel/i40e/i40e_txrx.h | 3 +-- 5 files changed, 20 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index a9d79bbd3ea7..528ef329a647 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h@@ -486,6 +486,7 @@ struct i40e_pf { u16 rss_size_max; /* HW defined max RSS queues */ u16 fdir_pf_filter_count; /* num of guaranteed filters for this PF */ u16 num_alloc_vsi; /* num VSIs this driver supports */ + u32 atr_sample_rate; bool wol_en; struct hlist_head fdir_filter_list;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 0ae50d7f3465..9b1ecb2c4edc 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c@@ -5300,6 +5300,16 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags) test_bit(I40E_FLAG_SOURCE_PRUNING_DIS, changed_flags)) reset_needed = BIT(__I40E_PF_RESET_REQUESTED); + /* Re-enabling ATR requires a reset to reprogram fd_ena in the + * TX queue HW context. Skip when FD_SB (ntuple) is already + * enabled, since i40e_configure_tx_ring() sets fd_ena when + * either FD flag is active. + */ + if (test_bit(I40E_FLAG_FD_ATR_ENA, changed_flags) && + test_bit(I40E_FLAG_FD_ATR_ENA, new_flags) && + !test_bit(I40E_FLAG_FD_SB_ENA, new_flags)) + reset_needed = BIT(__I40E_PF_RESET_REQUESTED); + /* Before we finalize any flag changes, we need to perform some * checks to ensure that the changes are supported and safe. */
@@ -5431,7 +5441,7 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags) case LIBIE_AQ_RC_EEXIST: dev_warn(&pf->pdev->dev, "FW LLDP agent is already running\n"); - reset_needed = 0; + reset_needed &= ~I40E_PF_RESET_AND_REBUILD_FLAG; break; case LIBIE_AQ_RC_EPERM: dev_warn(&pf->pdev->dev,
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 109ba6b20f8e..d83116596eda 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c@@ -3459,12 +3459,7 @@ static int i40e_configure_tx_ring(struct i40e_ring *ring) ring->xsk_pool = i40e_xsk_pool(ring); /* some ATR related tx ring init */ - if (test_bit(I40E_FLAG_FD_ATR_ENA, vsi->back->flags)) { - ring->atr_sample_rate = I40E_DEFAULT_ATR_SAMPLE_RATE; - ring->atr_count = 0; - } else { - ring->atr_sample_rate = 0; - } + ring->atr_count = 0; /* configure XPS */ i40e_config_xps_tx_ring(ring);
@@ -12754,6 +12749,8 @@ static int i40e_sw_init(struct i40e_pf *pf) } } + pf->atr_sample_rate = I40E_DEFAULT_ATR_SAMPLE_RATE; + if ((pf->hw.func_caps.fd_filters_guaranteed > 0) || (pf->hw.func_caps.fd_filters_best_effort > 0)) { set_bit(I40E_FLAG_FD_ATR_ENA, pf->flags);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 2032465c9b7c..acb47a9fd86f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c@@ -2887,6 +2887,7 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb, struct tcphdr *th; unsigned int hlen; u32 flex_ptype, dtype_cmd; + u32 sample_rate; int l4_proto; u16 i;
@@ -2898,7 +2899,8 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb, return; /* if sampling is disabled do nothing */ - if (!tx_ring->atr_sample_rate) + sample_rate = READ_ONCE(pf->atr_sample_rate); + if (!sample_rate) return; /* Currently only IPv4/IPv6 with TCP is supported */
@@ -2950,7 +2952,7 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb, if (!th->fin && !th->syn && !th->rst && - (tx_ring->atr_count < tx_ring->atr_sample_rate)) + (tx_ring->atr_count < sample_rate)) return; tx_ring->atr_count = 0;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index bb741ff3e5f2..be587f804e7a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h@@ -372,8 +372,7 @@ struct i40e_ring { u16 next_to_clean; u16 xdp_tx_active; - u8 atr_sample_rate; - u8 atr_count; + u32 atr_count; bool ring_active; /* is ring online or not */ bool arm_wb; /* do something to arm write back */
--
2.56.0