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Message-Id: <20230706204650.469087-16-maciej.fijalkowski@intel.com>
Date: Thu, 6 Jul 2023 22:46:41 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org,
ast@...nel.org,
daniel@...earbox.net,
andrii@...nel.org
Cc: netdev@...r.kernel.org,
magnus.karlsson@...el.com,
bjorn@...nel.org,
tirthendu.sarkar@...el.com,
maciej.fijalkowski@...el.com,
simon.horman@...igine.com,
toke@...nel.org
Subject: [PATCH v5 bpf-next 15/24] ice: xsk: Tx multi-buffer support
Most of this patch is about actually supporting XDP_TX action. Pure Tx
ZC support is only about looking at XDP_PKT_CONTD presence at options
field and based on that generating EOP bit on Tx HW descriptor. This is
that simple due to the implementation on
xsk_tx_peek_release_desc_batch() where we are making sure that last
produced descriptor is an EOP one.
Overwrite xdp_zc_max_segs with a value that defines max scatter-gatter
count on Tx side that HW can handle.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
drivers/net/ethernet/intel/ice/ice_main.c | 1 +
drivers/net/ethernet/intel/ice/ice_xsk.c | 83 ++++++++++++++++-------
2 files changed, 61 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 93979ab18bc1..f854e61e5ea2 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3392,6 +3392,7 @@ static void ice_set_ops(struct ice_vsi *vsi)
netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
NETDEV_XDP_ACT_XSK_ZEROCOPY |
NETDEV_XDP_ACT_RX_SG;
+ netdev->xdp_zc_max_segs = ICE_MAX_BUF_TXD;
}
/**
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 91cdd5e4790d..2a3f0834e139 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -613,7 +613,7 @@ ice_construct_skb_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
* ice_clean_xdp_irq_zc - produce AF_XDP descriptors to CQ
* @xdp_ring: XDP Tx ring
*/
-static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
+static u32 ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
{
u16 ntc = xdp_ring->next_to_clean;
struct ice_tx_desc *tx_desc;
@@ -635,7 +635,7 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
}
if (!completed_frames)
- return;
+ return 0;
if (likely(!xdp_ring->xdp_tx_active)) {
xsk_frames = completed_frames;
@@ -665,6 +665,8 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
xdp_ring->next_to_clean -= cnt;
if (xsk_frames)
xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
+
+ return completed_frames;
}
/**
@@ -682,37 +684,72 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
static int ice_xmit_xdp_tx_zc(struct xdp_buff *xdp,
struct ice_tx_ring *xdp_ring)
{
+ struct skb_shared_info *sinfo = NULL;
u32 size = xdp->data_end - xdp->data;
u32 ntu = xdp_ring->next_to_use;
struct ice_tx_desc *tx_desc;
struct ice_tx_buf *tx_buf;
- dma_addr_t dma;
+ struct xdp_buff *head;
+ u32 nr_frags = 0;
+ u32 free_space;
+ u32 frag = 0;
- if (ICE_DESC_UNUSED(xdp_ring) < ICE_RING_QUARTER(xdp_ring)) {
- ice_clean_xdp_irq_zc(xdp_ring);
- if (!ICE_DESC_UNUSED(xdp_ring)) {
- xdp_ring->ring_stats->tx_stats.tx_busy++;
- return ICE_XDP_CONSUMED;
- }
- }
+ free_space = ICE_DESC_UNUSED(xdp_ring);
+ if (free_space < ICE_RING_QUARTER(xdp_ring))
+ free_space += ice_clean_xdp_irq_zc(xdp_ring);
- dma = xsk_buff_xdp_get_dma(xdp);
- xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, size);
+ if (unlikely(!free_space))
+ goto busy;
+
+ if (unlikely(xdp_buff_has_frags(xdp))) {
+ sinfo = xdp_get_shared_info_from_buff(xdp);
+ nr_frags = sinfo->nr_frags;
+ if (free_space < nr_frags + 1)
+ goto busy;
+ }
- tx_buf = &xdp_ring->tx_buf[ntu];
- tx_buf->xdp = xdp;
- tx_buf->type = ICE_TX_BUF_XSK_TX;
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, size, 0);
- xdp_ring->xdp_tx_active++;
+ tx_buf = &xdp_ring->tx_buf[ntu];
+ head = xdp;
+
+ for (;;) {
+ dma_addr_t dma;
+
+ dma = xsk_buff_xdp_get_dma(xdp);
+ xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, size);
+
+ tx_buf->xdp = xdp;
+ tx_buf->type = ICE_TX_BUF_XSK_TX;
+ tx_desc->buf_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(0, 0, size, 0);
+ /* account for each xdp_buff from xsk_buff_pool */
+ xdp_ring->xdp_tx_active++;
+
+ if (++ntu == xdp_ring->count)
+ ntu = 0;
+
+ if (frag == nr_frags)
+ break;
+
+ tx_desc = ICE_TX_DESC(xdp_ring, ntu);
+ tx_buf = &xdp_ring->tx_buf[ntu];
+
+ xdp = xsk_buff_get_frag(head);
+ size = skb_frag_size(&sinfo->frags[frag]);
+ frag++;
+ }
- if (++ntu == xdp_ring->count)
- ntu = 0;
xdp_ring->next_to_use = ntu;
+ /* update last descriptor from a frame with EOP */
+ tx_desc->cmd_type_offset_bsz |=
+ cpu_to_le64(ICE_TX_DESC_CMD_EOP << ICE_TXD_QW1_CMD_S);
return ICE_XDP_TX;
+
+busy:
+ xdp_ring->ring_stats->tx_stats.tx_busy++;
+
+ return ICE_XDP_CONSUMED;
}
/**
@@ -960,7 +997,7 @@ static void ice_xmit_pkt(struct ice_tx_ring *xdp_ring, struct xdp_desc *desc,
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,
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(xsk_is_eop_desc(desc),
0, desc->len, 0);
*total_bytes += desc->len;
@@ -987,7 +1024,7 @@ static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring, struct xdp_desc *de
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,
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(xsk_is_eop_desc(&descs[i]),
0, descs[i].len, 0);
*total_bytes += descs[i].len;
--
2.34.1
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