From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
To: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net
Cc: netdev@vger.kernel.org, magnus.karlsson@intel.com,
alexandr.lobakin@intel.com,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: [PATCH bpf-next v4 7/8] ice: xsk: improve AF_XDP ZC Tx and use batching API
Date: Mon, 24 Jan 2022 17:55:46 +0100 [thread overview]
Message-ID: <20220124165547.74412-8-maciej.fijalkowski@intel.com> (raw)
In-Reply-To: <20220124165547.74412-1-maciej.fijalkowski@intel.com>
Apply the logic that was done for regular XDP from commit 9610bd988df9
("ice: optimize XDP_TX workloads") to the ZC side of the driver. On top
of that, introduce batching to Tx that is inspired by i40e's
implementation with adjustments to the cleaning logic - take into the
account NAPI budget in ice_clean_xdp_irq_zc().
Separating the stats structs onto separate cache lines seemed to improve
the performance.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
drivers/net/ethernet/intel/ice/ice_txrx.c | 2 +-
drivers/net/ethernet/intel/ice/ice_txrx.h | 2 +-
drivers/net/ethernet/intel/ice/ice_xsk.c | 256 ++++++++++++++--------
drivers/net/ethernet/intel/ice/ice_xsk.h | 27 ++-
4 files changed, 188 insertions(+), 99 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 73f60493209d..7d8824b4c8ff 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1462,7 +1462,7 @@ int ice_napi_poll(struct napi_struct *napi, int budget)
bool wd;
if (tx_ring->xsk_pool)
- wd = ice_clean_tx_irq_zc(tx_ring, budget);
+ wd = ice_xmit_zc(tx_ring, ICE_DESC_UNUSED(tx_ring), budget);
else if (ice_ring_is_xdp(tx_ring))
wd = true;
else
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 611dd7c4a631..ea6c9cc02a1a 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -322,9 +322,9 @@ struct ice_tx_ring {
u16 count; /* Number of descriptors */
u16 q_index; /* Queue number of ring */
/* stats structs */
+ struct ice_txq_stats tx_stats;
struct ice_q_stats stats;
struct u64_stats_sync syncp;
- struct ice_txq_stats tx_stats;
/* CL3 - 3rd cacheline starts here */
struct rcu_head rcu; /* to avoid race on free */
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 8c82093fc8ec..7225c3d0b6d0 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -680,134 +680,212 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
}
/**
- * ice_xmit_zc - Completes AF_XDP entries, and cleans XDP entries
+ * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer
* @xdp_ring: XDP Tx ring
- * @budget: max number of frames to xmit
+ * @tx_buf: Tx buffer to clean
+ */
+static void
+ice_clean_xdp_tx_buf(struct ice_tx_ring *xdp_ring, struct ice_tx_buf *tx_buf)
+{
+ xdp_return_frame((struct xdp_frame *)tx_buf->raw_buf);
+ dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma),
+ dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_buf, len, 0);
+}
+
+/**
+ * ice_clean_xdp_irq_zc - Reclaim resources after transmit completes on XDP ring
+ * @xdp_ring: XDP ring to clean
+ * @napi_budget: amount of descriptors that NAPI allows us to clean
*
- * Returns true if cleanup/transmission is done.
+ * Returns count of cleaned descriptors
*/
-static bool ice_xmit_zc(struct ice_tx_ring *xdp_ring, int budget)
+static u16 ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring, int napi_budget)
{
- struct ice_tx_desc *tx_desc = NULL;
- bool work_done = true;
- struct xdp_desc desc;
- dma_addr_t dma;
+ u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
+ int budget = napi_budget / tx_thresh;
+ u16 ntc = xdp_ring->next_to_clean;
+ u16 next_dd = xdp_ring->next_dd;
+ u16 cleared_dds = 0;
- while (likely(budget-- > 0)) {
+ do {
+ struct ice_tx_desc *next_dd_desc;
+ u16 desc_cnt = xdp_ring->count;
struct ice_tx_buf *tx_buf;
+ u32 xsk_frames;
+ u16 i;
- if (unlikely(!ICE_DESC_UNUSED(xdp_ring))) {
- xdp_ring->tx_stats.tx_busy++;
- work_done = false;
- break;
- }
-
- tx_buf = &xdp_ring->tx_buf[xdp_ring->next_to_use];
-
- if (!xsk_tx_peek_desc(xdp_ring->xsk_pool, &desc))
+ next_dd_desc = ICE_TX_DESC(xdp_ring, next_dd);
+ if (!(next_dd_desc->cmd_type_offset_bsz &
+ cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
break;
- dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc.addr);
- xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma,
- desc.len);
+ cleared_dds++;
+ xsk_frames = 0;
- tx_buf->bytecount = desc.len;
+ for (i = 0; i < tx_thresh; i++) {
+ tx_buf = &xdp_ring->tx_buf[ntc];
- tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use);
- tx_desc->buf_addr = cpu_to_le64(dma);
- tx_desc->cmd_type_offset_bsz =
- ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0, desc.len, 0);
+ if (tx_buf->raw_buf) {
+ ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
+ tx_buf->raw_buf = NULL;
+ } else {
+ xsk_frames++;
+ }
- xdp_ring->next_to_use++;
- if (xdp_ring->next_to_use == xdp_ring->count)
- xdp_ring->next_to_use = 0;
- }
+ ntc++;
+ if (ntc >= xdp_ring->count)
+ ntc = 0;
+ }
+ if (xsk_frames)
+ xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
+ next_dd_desc->cmd_type_offset_bsz = 0;
+ next_dd = next_dd + tx_thresh;
+ if (next_dd >= desc_cnt)
+ next_dd = tx_thresh - 1;
+ } while (budget--);
- if (tx_desc) {
- ice_xdp_ring_update_tail(xdp_ring);
- xsk_tx_release(xdp_ring->xsk_pool);
- }
+ xdp_ring->next_to_clean = ntc;
+ xdp_ring->next_dd = next_dd;
- return budget > 0 && work_done;
+ return cleared_dds * tx_thresh;
}
/**
- * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer
- * @xdp_ring: XDP Tx ring
- * @tx_buf: Tx buffer to clean
+ * ice_xmit_pkt - produce a single HW Tx descriptor out of AF_XDP descriptor
+ * @xdp_ring: XDP ring to produce the HW Tx descriptor on
+ * @desc: AF_XDP descriptor to pull the DMA address and length from
+ * @total_bytes: bytes accumulator that will be used for stats update
*/
-static void
-ice_clean_xdp_tx_buf(struct ice_tx_ring *xdp_ring, struct ice_tx_buf *tx_buf)
+static void ice_xmit_pkt(struct ice_tx_ring *xdp_ring, struct xdp_desc *desc,
+ unsigned int *total_bytes)
{
- xdp_return_frame((struct xdp_frame *)tx_buf->raw_buf);
- dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma),
- dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
- dma_unmap_len_set(tx_buf, len, 0);
+ struct ice_tx_desc *tx_desc;
+ dma_addr_t dma;
+
+ dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
+ xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
+
+ tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
+ tx_desc->buf_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
+ 0, desc->len, 0);
+
+ *total_bytes += desc->len;
}
/**
- * ice_clean_tx_irq_zc - Completes AF_XDP entries, and cleans XDP entries
- * @xdp_ring: XDP Tx ring
- * @budget: NAPI budget
- *
- * Returns true if cleanup/tranmission is done.
+ * ice_xmit_pkt_batch - produce a batch of HW Tx descriptors out of AF_XDP descriptors
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
+ * @total_bytes: bytes accumulator that will be used for stats update
*/
-bool ice_clean_tx_irq_zc(struct ice_tx_ring *xdp_ring, int budget)
+static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
+ unsigned int *total_bytes)
{
- int total_packets = 0, total_bytes = 0;
- s16 ntc = xdp_ring->next_to_clean;
+ u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
+ u16 ntu = xdp_ring->next_to_use;
struct ice_tx_desc *tx_desc;
- struct ice_tx_buf *tx_buf;
- u32 xsk_frames = 0;
- bool xmit_done;
+ u32 i;
- tx_desc = ICE_TX_DESC(xdp_ring, ntc);
- tx_buf = &xdp_ring->tx_buf[ntc];
- ntc -= xdp_ring->count;
+ loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
+ dma_addr_t dma;
- do {
- if (!(tx_desc->cmd_type_offset_bsz &
- cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
- break;
+ dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, descs[i].addr);
+ xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, descs[i].len);
- total_bytes += tx_buf->bytecount;
- total_packets++;
+ tx_desc = ICE_TX_DESC(xdp_ring, ntu++);
+ tx_desc->buf_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
+ 0, descs[i].len, 0);
- if (tx_buf->raw_buf) {
- ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
- tx_buf->raw_buf = NULL;
- } else {
- xsk_frames++;
- }
+ *total_bytes += descs[i].len;
+ }
- tx_desc->cmd_type_offset_bsz = 0;
- tx_buf++;
- tx_desc++;
- ntc++;
+ xdp_ring->next_to_use = ntu;
- if (unlikely(!ntc)) {
- ntc -= xdp_ring->count;
- tx_buf = xdp_ring->tx_buf;
- tx_desc = ICE_TX_DESC(xdp_ring, 0);
- }
+ if (xdp_ring->next_to_use > xdp_ring->next_rs) {
+ 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 += tx_thresh;
+ }
+}
- prefetch(tx_desc);
+/**
+ * ice_fill_tx_hw_ring - produce the number of Tx descriptors onto ring
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
+ * @nb_pkts: count of packets to be send
+ * @total_bytes: bytes accumulator that will be used for stats update
+ */
+static void ice_fill_tx_hw_ring(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
+ u32 nb_pkts, unsigned int *total_bytes)
+{
+ u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
+ u32 batched, leftover, i;
+
+ batched = ALIGN_DOWN(nb_pkts, PKTS_PER_BATCH);
+ leftover = nb_pkts & (PKTS_PER_BATCH - 1);
+ for (i = 0; i < batched; i += PKTS_PER_BATCH)
+ ice_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
+ for (; i < batched + leftover; i++)
+ ice_xmit_pkt(xdp_ring, &descs[i], total_bytes);
+
+ if (xdp_ring->next_to_use > xdp_ring->next_rs) {
+ struct ice_tx_desc *tx_desc;
+
+ 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 += tx_thresh;
+ }
+}
- } while (likely(--budget));
+/**
+ * ice_xmit_zc - take entries from XSK Tx ring and place them onto HW Tx ring
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ * @budget: number of free descriptors on HW Tx ring that can be used
+ * @napi_budget: amount of descriptors that NAPI allows us to clean
+ *
+ * Returns true if there is no more work that needs to be done, false otherwise
+ */
+bool ice_xmit_zc(struct ice_tx_ring *xdp_ring, u32 budget, int napi_budget)
+{
+ struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
+ u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
+ u32 nb_pkts, nb_processed = 0;
+ unsigned int total_bytes = 0;
+
+ if (budget < tx_thresh)
+ budget += ice_clean_xdp_irq_zc(xdp_ring, napi_budget);
+
+ nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
+ if (!nb_pkts)
+ return true;
+
+ if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
+ struct ice_tx_desc *tx_desc;
+
+ nb_processed = xdp_ring->count - xdp_ring->next_to_use;
+ ice_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
+ 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 = tx_thresh - 1;
+ xdp_ring->next_to_use = 0;
+ }
- ntc += xdp_ring->count;
- xdp_ring->next_to_clean = ntc;
+ ice_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
+ &total_bytes);
- if (xsk_frames)
- xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
+ ice_xdp_ring_update_tail(xdp_ring);
+ ice_update_tx_ring_stats(xdp_ring, nb_pkts, total_bytes);
if (xsk_uses_need_wakeup(xdp_ring->xsk_pool))
xsk_set_tx_need_wakeup(xdp_ring->xsk_pool);
- ice_update_tx_ring_stats(xdp_ring, total_packets, total_bytes);
- xmit_done = ice_xmit_zc(xdp_ring, ICE_DFLT_IRQ_WORK);
-
- return budget > 0 && xmit_done;
+ return nb_pkts < budget;
}
/**
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.h b/drivers/net/ethernet/intel/ice/ice_xsk.h
index 4c7bd8e9dfc4..0cbb5793b5b8 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.h
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.h
@@ -6,19 +6,37 @@
#include "ice_txrx.h"
#include "ice.h"
+#define PKTS_PER_BATCH 8
+
+#ifdef __clang__
+#define loop_unrolled_for _Pragma("clang loop unroll_count(8)") for
+#elif __GNUC__ >= 4
+#define loop_unrolled_for _Pragma("GCC unroll 8") for
+#else
+#define loop_unrolled_for for
+#endif
+
struct ice_vsi;
#ifdef CONFIG_XDP_SOCKETS
int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool,
u16 qid);
int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget);
-bool ice_clean_tx_irq_zc(struct ice_tx_ring *xdp_ring, int budget);
int ice_xsk_wakeup(struct net_device *netdev, u32 queue_id, u32 flags);
bool ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count);
bool ice_xsk_any_rx_ring_ena(struct ice_vsi *vsi);
void ice_xsk_clean_rx_ring(struct ice_rx_ring *rx_ring);
void ice_xsk_clean_xdp_ring(struct ice_tx_ring *xdp_ring);
+bool ice_xmit_zc(struct ice_tx_ring *xdp_ring, u32 budget, int napi_budget);
#else
+static inline bool
+ice_xmit_zc(struct ice_tx_ring __always_unused *xdp_ring,
+ u32 __always_unused budget,
+ int __always_unused napi_budget)
+{
+ return false;
+}
+
static inline int
ice_xsk_pool_setup(struct ice_vsi __always_unused *vsi,
struct xsk_buff_pool __always_unused *pool,
@@ -34,13 +52,6 @@ ice_clean_rx_irq_zc(struct ice_rx_ring __always_unused *rx_ring,
return 0;
}
-static inline bool
-ice_clean_tx_irq_zc(struct ice_tx_ring __always_unused *xdp_ring,
- int __always_unused budget)
-{
- return false;
-}
-
static inline bool
ice_alloc_rx_bufs_zc(struct ice_rx_ring __always_unused *rx_ring,
u16 __always_unused count)
--
2.33.1
next prev parent reply other threads:[~2022-01-24 16:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 16:55 [PATCH v4 bpf-next 0/8] xsk: Intel driver improvements Maciej Fijalkowski
2022-01-24 16:55 ` [PATCH bpf-next v4 1/8] ice: remove likely for napi_complete_done Maciej Fijalkowski
2022-01-25 8:59 ` Magnus Karlsson
2022-01-24 16:55 ` [PATCH bpf-next v4 2/8] ice: xsk: force rings to be sized to power of 2 Maciej Fijalkowski
2022-01-25 9:06 ` Magnus Karlsson
2022-01-25 11:23 ` Alexander Lobakin
2022-01-25 11:28 ` Maciej Fijalkowski
2022-01-25 11:42 ` Alexander Lobakin
2022-01-25 11:49 ` Maciej Fijalkowski
2022-01-25 12:00 ` Alexander Lobakin
2022-01-25 15:01 ` Maciej Fijalkowski
2022-01-25 15:24 ` Alexander Lobakin
2022-01-24 16:55 ` [PATCH bpf-next v4 3/8] ice: xsk: handle SW XDP ring wrap and bump tail more often Maciej Fijalkowski
2022-01-24 16:55 ` [PATCH bpf-next v4 4/8] ice: make Tx threshold dependent on ring length Maciej Fijalkowski
2022-01-25 9:09 ` Magnus Karlsson
2022-01-24 16:55 ` [PATCH bpf-next v4 5/8] i40e: xsk: move tmp desc array from driver to pool Maciej Fijalkowski
2022-01-24 16:55 ` [PATCH bpf-next v4 6/8] ice: xsk: avoid potential dead AF_XDP Tx processing Maciej Fijalkowski
2022-01-24 16:55 ` Maciej Fijalkowski [this message]
2022-01-25 9:32 ` [PATCH bpf-next v4 7/8] ice: xsk: improve AF_XDP ZC Tx and use batching API Magnus Karlsson
2022-01-25 11:23 ` Maciej Fijalkowski
2022-01-24 16:55 ` [PATCH bpf-next v4 8/8] ice: xsk: borrow xdp_tx_active logic from i40e Maciej Fijalkowski
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