On 12/12/2023 6:55 AM, Michal Kubiak wrote:
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From: Joshua Hay <joshua.a....@intel.com>
Tell hardware to writeback completed descriptors even when interrupts
are disabled. Otherwise, descriptors might not be written back until
the hardware can flush a full cacheline of descriptors. This can cause
unnecessary delays when traffic is light (or even trigger Tx queue
timeout).
Fixes: c2d548cad150 ("idpf: add TX splitq napi poll support")
Fixes: a5ab9ee0df0b ("idpf: add singleq start_xmit and napi poll")
Reviewed-by: Przemek Kitszel <przemyslaw.kits...@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.loba...@intel.com>
Signed-off-by: Joshua Hay <joshua.a....@intel.com>
Co-developed-by: Michal Kubiak <michal.kub...@intel.com>
Signed-off-by: Michal Kubiak <michal.kub...@intel.com>
---
drivers/net/ethernet/intel/idpf/idpf_dev.c | 2 ++
.../ethernet/intel/idpf/idpf_singleq_txrx.c | 6 ++++-
drivers/net/ethernet/intel/idpf/idpf_txrx.c | 7 +++++-
drivers/net/ethernet/intel/idpf/idpf_txrx.h | 23 +++++++++++++++++++
drivers/net/ethernet/intel/idpf/idpf_vf_dev.c | 2 ++
5 files changed, 38 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/idpf/idpf_dev.c
b/drivers/net/ethernet/intel/idpf/idpf_dev.c
index 34ad1ac46b78..2c6776086130 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_dev.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_dev.c
@@ -96,8 +96,10 @@ static int idpf_intr_reg_init(struct idpf_vport *vport)
intr->dyn_ctl = idpf_get_reg_addr(adapter,
reg_vals[vec_id].dyn_ctl_reg);
intr->dyn_ctl_intena_m = PF_GLINT_DYN_CTL_INTENA_M;
+ intr->dyn_ctl_intena_msk_m = PF_GLINT_DYN_CTL_INTENA_MSK_M;
intr->dyn_ctl_itridx_s = PF_GLINT_DYN_CTL_ITR_INDX_S;
intr->dyn_ctl_intrvl_s = PF_GLINT_DYN_CTL_INTERVAL_S;
+ intr->dyn_ctl_wb_on_itr_m = PF_GLINT_DYN_CTL_WB_ON_ITR_M;
spacing =
IDPF_ITR_IDX_SPACING(reg_vals[vec_id].itrn_index_spacing,
IDPF_PF_ITR_IDX_SPACING);
diff --git a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
index 81288a17da2a..8e1478b7d86c 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
@@ -1168,8 +1168,10 @@ int idpf_vport_singleq_napi_poll(struct napi_struct
*napi, int budget)
&work_done);
/* If work not completed, return budget and polling will return */
- if (!clean_complete)
+ if (!clean_complete) {
+ idpf_vport_intr_set_wb_on_itr(q_vector);
return budget;
+ }
work_done = min_t(int, work_done, budget - 1);
@@ -1178,6 +1180,8 @@ int idpf_vport_singleq_napi_poll(struct napi_struct
*napi, int budget)
*/
if (likely(napi_complete_done(napi, work_done)))
idpf_vport_intr_update_itr_ena_irq(q_vector);
+ else
+ idpf_vport_intr_set_wb_on_itr(q_vector);
return work_done;
}
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index 1646ff3877ba..b496566ee2aa 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
@@ -3639,6 +3639,7 @@ void idpf_vport_intr_update_itr_ena_irq(struct
idpf_q_vector *q_vector)
IDPF_NO_ITR_UPDATE_IDX, 0);
writel(intval, q_vector->intr_reg.dyn_ctl);
+ q_vector->wb_on_itr = false;
}
/**
@@ -3930,8 +3931,10 @@ static int idpf_vport_splitq_napi_poll(struct
napi_struct *napi, int budget)
clean_complete &= idpf_tx_splitq_clean_all(q_vector, budget,
&work_done);
/* If work not completed, return budget and polling will return */
- if (!clean_complete)
+ if (!clean_complete) {
+ idpf_vport_intr_set_wb_on_itr(q_vector);
return budget;
+ }
work_done = min_t(int, work_done, budget - 1);
@@ -3940,6 +3943,8 @@ static int idpf_vport_splitq_napi_poll(struct napi_struct
*napi, int budget)
*/
if (likely(napi_complete_done(napi, work_done)))
idpf_vport_intr_update_itr_ena_irq(q_vector);
+ else
+ idpf_vport_intr_set_wb_on_itr(q_vector);
/* Switch to poll mode in the tear-down path after sending disable
* queues virtchnl message, as the interrupts will be disabled after
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
index df76493faa75..50761c2d9f3b 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
@@ -495,9 +495,11 @@ struct idpf_vec_regs {
struct idpf_intr_reg {
void __iomem *dyn_ctl;
u32 dyn_ctl_intena_m;
+ u32 dyn_ctl_intena_msk_m;
u32 dyn_ctl_itridx_s;
u32 dyn_ctl_itridx_m;
u32 dyn_ctl_intrvl_s;
+ u32 dyn_ctl_wb_on_itr_m;
void __iomem *rx_itr;
void __iomem *tx_itr;
void __iomem *icr_ena;
@@ -534,6 +536,7 @@ struct idpf_q_vector {
struct napi_struct napi;
u16 v_idx;
struct idpf_intr_reg intr_reg;
+ bool wb_on_itr;
Not sure if this was considered, but it might be best to put this before
intr_reg so it's on the same cacheline as intr_reg.
u16 num_txq;
struct idpf_queue **tx;
@@ -973,6 +976,26 @@ static inline void idpf_rx_sync_for_cpu(struct idpf_rx_buf
*rx_buf, u32 len)
page_pool_get_dma_dir(pp));
}
+/**
+ * idpf_vport_intr_set_wb_on_itr - enable descriptor writeback on disabled
interrupts
+ * @q_vector: pointer to queue vector struct
+ */
+static inline void idpf_vport_intr_set_wb_on_itr(struct idpf_q_vector
*q_vector)
+{
+ struct idpf_intr_reg *reg;
+
+ if (q_vector->wb_on_itr)
+ return;
+
+ reg = &q_vector->intr_reg;
+
+ writel(reg->dyn_ctl_wb_on_itr_m | reg->dyn_ctl_intena_msk_m |
+ IDPF_NO_ITR_UPDATE_IDX << reg->dyn_ctl_itridx_s,
+ reg->dyn_ctl);
+
+ q_vector->wb_on_itr = true;
+}
+
int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget);
void idpf_vport_init_num_qs(struct idpf_vport *vport,
struct virtchnl2_create_vport *vport_msg);
diff --git a/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c
b/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c
index 8ade4e3a9fe1..f5b0a0666636 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c
@@ -96,7 +96,9 @@ static int idpf_vf_intr_reg_init(struct idpf_vport *vport)
intr->dyn_ctl = idpf_get_reg_addr(adapter,
reg_vals[vec_id].dyn_ctl_reg);
intr->dyn_ctl_intena_m = VF_INT_DYN_CTLN_INTENA_M;
+ intr->dyn_ctl_intena_msk_m = VF_INT_DYN_CTLN_INTENA_MSK_M;
intr->dyn_ctl_itridx_s = VF_INT_DYN_CTLN_ITR_INDX_S;
+ intr->dyn_ctl_wb_on_itr_m = VF_INT_DYN_CTLN_WB_ON_ITR_M;
spacing =
IDPF_ITR_IDX_SPACING(reg_vals[vec_id].itrn_index_spacing,
IDPF_VF_ITR_IDX_SPACING);
--
2.33.1
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