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Date: Fri, 21 Jan 2022 13:00:07 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc: netdev@...r.kernel.org, magnus.karlsson@...el.com,
alexandr.lobakin@...el.com,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH bpf-next v3 3/7] ice: make Tx threshold dependent on ring length
XDP_TX workloads use a concept of Tx threshold that indicates the
interval of setting RS bit on descriptors which in turn tells the HW to
generate an interrupt to signal the completion of Tx on HW side. It is
currently based on a constant value of 32 which might not work out well
for various sizes of ring combined with for example batch size that can
be set via SO_BUSY_POLL_BUDGET.
Internal tests based on AF_XDP showed that most convenient setup of
mentioned threshold is when it is equal to quarter of a ring length.
Introduce @tx_thresh field in ice_tx_ring struct that will store the
value of threshold and use it in favor of ICE_TX_THRESH.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
drivers/net/ethernet/intel/ice/ice_ethtool.c | 3 +++
drivers/net/ethernet/intel/ice/ice_main.c | 5 +++--
drivers/net/ethernet/intel/ice/ice_txrx.h | 7 ++++++-
drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 14 ++++++++------
4 files changed, 20 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index e2e3ef7fba7f..bfa5e5d167ab 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -2803,6 +2803,9 @@ ice_set_ringparam(struct net_device *netdev, struct ethtool_ringparam *ring,
/* clone ring and setup updated count */
xdp_rings[i] = *vsi->xdp_rings[i];
xdp_rings[i].count = new_tx_cnt;
+ xdp_rings[i].tx_thresh = ice_get_tx_threshold(&xdp_rings[i]);
+ xdp_rings[i].next_dd = xdp_rings[i].tx_thresh - 1;
+ xdp_rings[i].next_rs = xdp_rings[i].tx_thresh - 1;
xdp_rings[i].desc = NULL;
xdp_rings[i].tx_buf = NULL;
err = ice_setup_tx_ring(&xdp_rings[i]);
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 30814435f779..0fd12a7f6d22 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -2495,10 +2495,11 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
xdp_ring->reg_idx = vsi->txq_map[xdp_q_idx];
xdp_ring->vsi = vsi;
xdp_ring->netdev = NULL;
- xdp_ring->next_dd = ICE_TX_THRESH - 1;
- xdp_ring->next_rs = ICE_TX_THRESH - 1;
xdp_ring->dev = dev;
xdp_ring->count = vsi->num_tx_desc;
+ xdp_ring->tx_thresh = ice_get_tx_threshold(xdp_ring);
+ xdp_ring->next_dd = xdp_ring->tx_thresh - 1;
+ xdp_ring->next_rs = xdp_ring->tx_thresh - 1;
WRITE_ONCE(vsi->xdp_rings[i], xdp_ring);
if (ice_setup_tx_ring(xdp_ring))
goto free_xdp_rings;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 94a46e0e5ed0..09c8ad2f7403 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -13,7 +13,6 @@
#define ICE_MAX_CHAINED_RX_BUFS 5
#define ICE_MAX_BUF_TXD 8
#define ICE_MIN_TX_LEN 17
-#define ICE_TX_THRESH 32
/* The size limit for a transmit buffer in a descriptor is (16K - 1).
* In order to align with the read requests we will align the value to
@@ -333,6 +332,7 @@ struct ice_tx_ring {
struct ice_channel *ch;
struct ice_ptp_tx *tx_tstamps;
spinlock_t tx_lock;
+ u16 tx_thresh;
u32 txq_teid; /* Added Tx queue TEID */
#define ICE_TX_FLAGS_RING_XDP BIT(0)
u8 flags;
@@ -355,6 +355,11 @@ static inline void ice_clear_ring_build_skb_ena(struct ice_rx_ring *ring)
ring->flags &= ~ICE_RX_FLAGS_RING_BUILD_SKB;
}
+static inline u16 ice_get_tx_threshold(struct ice_tx_ring *tx_ring)
+{
+ return ICE_RING_QUARTER(tx_ring);
+}
+
static inline bool ice_ring_ch_enabled(struct ice_tx_ring *ring)
{
return !!ring->ch;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 0e87b98e0966..5706b5405373 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -222,6 +222,7 @@ ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
static void ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
{
unsigned int total_bytes = 0, total_pkts = 0;
+ u16 tx_thresh = xdp_ring->tx_thresh;
u16 ntc = xdp_ring->next_to_clean;
struct ice_tx_desc *next_dd_desc;
u16 next_dd = xdp_ring->next_dd;
@@ -233,7 +234,7 @@ static void ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
return;
- for (i = 0; i < ICE_TX_THRESH; i++) {
+ for (i = 0; i < tx_thresh; i++) {
tx_buf = &xdp_ring->tx_buf[ntc];
total_bytes += tx_buf->bytecount;
@@ -254,9 +255,9 @@ static void ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
}
next_dd_desc->cmd_type_offset_bsz = 0;
- xdp_ring->next_dd = xdp_ring->next_dd + ICE_TX_THRESH;
+ xdp_ring->next_dd = xdp_ring->next_dd + tx_thresh;
if (xdp_ring->next_dd > xdp_ring->count)
- xdp_ring->next_dd = ICE_TX_THRESH - 1;
+ xdp_ring->next_dd = tx_thresh - 1;
xdp_ring->next_to_clean = ntc;
ice_update_tx_ring_stats(xdp_ring, total_pkts, total_bytes);
}
@@ -269,12 +270,13 @@ static void ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
*/
int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring)
{
+ u16 tx_thresh = xdp_ring->tx_thresh;
u16 i = xdp_ring->next_to_use;
struct ice_tx_desc *tx_desc;
struct ice_tx_buf *tx_buf;
dma_addr_t dma;
- if (ICE_DESC_UNUSED(xdp_ring) < ICE_TX_THRESH)
+ if (ICE_DESC_UNUSED(xdp_ring) < tx_thresh)
ice_clean_xdp_irq(xdp_ring);
if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) {
@@ -306,7 +308,7 @@ int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring)
tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
tx_desc->cmd_type_offset_bsz |=
cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
- xdp_ring->next_rs = ICE_TX_THRESH - 1;
+ xdp_ring->next_rs = tx_thresh - 1;
}
xdp_ring->next_to_use = i;
@@ -314,7 +316,7 @@ int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring)
tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
tx_desc->cmd_type_offset_bsz |=
cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
- xdp_ring->next_rs += ICE_TX_THRESH;
+ xdp_ring->next_rs += tx_thresh;
}
return ICE_XDP_TX;
--
2.33.1
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