* [RFC net-next 1/2] ixgbe: add xdp frags support to ndo_xdp_xmit
2022-03-25 14:28 [RFC net-next 0/2] Introduce xdp tx mb support for i40e and ixgbe Lorenzo Bianconi
@ 2022-03-25 14:28 ` Lorenzo Bianconi
2022-03-25 14:28 ` [RFC net-next 2/2] i40e: " Lorenzo Bianconi
1 sibling, 0 replies; 3+ messages in thread
From: Lorenzo Bianconi @ 2022-03-25 14:28 UTC (permalink / raw)
To: netdev
Cc: davem, kuba, pabeni, jesse.brandeburg, anthony.l.nguyen, jbrouer,
magnus.karlsson, toke, lorenzo.bianconi
Add the capability to map non-linear xdp frames in XDP_TX and ndo_xdp_xmit
callback.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 99 ++++++++++++-------
1 file changed, 63 insertions(+), 36 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index c4a4954aa317..0dd5b2687609 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8571,57 +8571,84 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb,
int ixgbe_xmit_xdp_ring(struct ixgbe_ring *ring,
struct xdp_frame *xdpf)
{
- struct ixgbe_tx_buffer *tx_buffer;
- union ixgbe_adv_tx_desc *tx_desc;
- u32 len, cmd_type;
- dma_addr_t dma;
- u16 i;
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf);
+ u8 nr_frags = unlikely(xdp_frame_has_frags(xdpf)) ? sinfo->nr_frags : 0;
+ u16 i = 0, index = ring->next_to_use;
+ struct ixgbe_tx_buffer *tx_head = &ring->tx_buffer_info[index];
+ struct ixgbe_tx_buffer *tx_buff = tx_head;
+ union ixgbe_adv_tx_desc *tx_desc = IXGBE_TX_DESC(ring, index);
+ u32 cmd_type, len = xdpf->len;
+ void *data = xdpf->data;
+
+ if (unlikely(ixgbe_desc_unused(ring) < 1 + nr_frags))
+ return IXGBE_XDP_CONSUMED;
- len = xdpf->len;
+ tx_head->bytecount = xdp_get_frame_len(xdpf);
+ tx_head->gso_segs = 1;
+ tx_head->xdpf = xdpf;
- if (unlikely(!ixgbe_desc_unused(ring)))
- return IXGBE_XDP_CONSUMED;
+ tx_desc->read.olinfo_status =
+ cpu_to_le32(tx_head->bytecount << IXGBE_ADVTXD_PAYLEN_SHIFT);
- dma = dma_map_single(ring->dev, xdpf->data, len, DMA_TO_DEVICE);
- if (dma_mapping_error(ring->dev, dma))
- return IXGBE_XDP_CONSUMED;
+ for (;;) {
+ dma_addr_t dma;
- /* record the location of the first descriptor for this packet */
- tx_buffer = &ring->tx_buffer_info[ring->next_to_use];
- tx_buffer->bytecount = len;
- tx_buffer->gso_segs = 1;
- tx_buffer->protocol = 0;
+ dma = dma_map_single(ring->dev, data, len, DMA_TO_DEVICE);
+ if (dma_mapping_error(ring->dev, dma))
+ goto unmap;
+
+ dma_unmap_len_set(tx_buff, len, len);
+ dma_unmap_addr_set(tx_buff, dma, dma);
- i = ring->next_to_use;
- tx_desc = IXGBE_TX_DESC(ring, i);
+ cmd_type = IXGBE_ADVTXD_DTYP_DATA | IXGBE_ADVTXD_DCMD_DEXT |
+ IXGBE_ADVTXD_DCMD_IFCS | len;
+ tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
+ tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ tx_buff->protocol = 0;
- dma_unmap_len_set(tx_buffer, len, len);
- dma_unmap_addr_set(tx_buffer, dma, dma);
- tx_buffer->xdpf = xdpf;
+ if (++index == ring->count)
+ index = 0;
- tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ if (i == nr_frags)
+ break;
+
+ tx_buff = &ring->tx_buffer_info[index];
+ tx_desc = IXGBE_TX_DESC(ring, index);
+
+ tx_desc->read.olinfo_status = 0;
+ data = skb_frag_address(&sinfo->frags[i]);
+ len = skb_frag_size(&sinfo->frags[i]);
+ i++;
+ }
/* put descriptor type bits */
- cmd_type = IXGBE_ADVTXD_DTYP_DATA |
- IXGBE_ADVTXD_DCMD_DEXT |
- IXGBE_ADVTXD_DCMD_IFCS;
- cmd_type |= len | IXGBE_TXD_CMD;
- tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
- tx_desc->read.olinfo_status =
- cpu_to_le32(len << IXGBE_ADVTXD_PAYLEN_SHIFT);
+ tx_desc->read.cmd_type_len |= cpu_to_le32(IXGBE_TXD_CMD);
/* Avoid any potential race with xdp_xmit and cleanup */
smp_wmb();
- /* set next_to_watch value indicating a packet is present */
- i++;
- if (i == ring->count)
- i = 0;
-
- tx_buffer->next_to_watch = tx_desc;
- ring->next_to_use = i;
+ tx_head->next_to_watch = tx_desc;
+ ring->next_to_use = index;
return IXGBE_XDP_TX;
+
+unmap:
+ for (;;) {
+ tx_buff = &ring->tx_buffer_info[index];
+ if (dma_unmap_len(tx_buff, len))
+ dma_unmap_page(ring->dev, dma_unmap_addr(tx_buff, dma),
+ dma_unmap_len(tx_buff, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_buff, len, 0);
+ if (tx_buff == tx_head)
+ break;
+
+ if (!index)
+ index += ring->count;
+ index--;
+ }
+
+ return IXGBE_XDP_CONSUMED;
}
netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
--
2.35.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [RFC net-next 2/2] i40e: add xdp frags support to ndo_xdp_xmit
2022-03-25 14:28 [RFC net-next 0/2] Introduce xdp tx mb support for i40e and ixgbe Lorenzo Bianconi
2022-03-25 14:28 ` [RFC net-next 1/2] ixgbe: add xdp frags support to ndo_xdp_xmit Lorenzo Bianconi
@ 2022-03-25 14:28 ` Lorenzo Bianconi
1 sibling, 0 replies; 3+ messages in thread
From: Lorenzo Bianconi @ 2022-03-25 14:28 UTC (permalink / raw)
To: netdev
Cc: davem, kuba, pabeni, jesse.brandeburg, anthony.l.nguyen, jbrouer,
magnus.karlsson, toke, lorenzo.bianconi
Add the capability to map non-linear xdp frames in XDP_TX and ndo_xdp_xmit
callback.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 86 +++++++++++++++------
1 file changed, 61 insertions(+), 25 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 0eae5858f2fe..e9a772db869c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -3688,35 +3688,55 @@ u16 i40e_lan_select_queue(struct net_device *netdev,
static int i40e_xmit_xdp_ring(struct xdp_frame *xdpf,
struct i40e_ring *xdp_ring)
{
- u16 i = xdp_ring->next_to_use;
- struct i40e_tx_buffer *tx_bi;
- struct i40e_tx_desc *tx_desc;
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf);
+ u8 nr_frags = unlikely(xdp_frame_has_frags(xdpf)) ? sinfo->nr_frags : 0;
+ u16 i = 0, index = xdp_ring->next_to_use;
+ struct i40e_tx_buffer *tx_head = &xdp_ring->tx_bi[index];
+ struct i40e_tx_buffer *tx_bi = tx_head;
+ struct i40e_tx_desc *tx_desc = I40E_TX_DESC(xdp_ring, index);
void *data = xdpf->data;
u32 size = xdpf->len;
- dma_addr_t dma;
- if (!unlikely(I40E_DESC_UNUSED(xdp_ring))) {
+ if (unlikely(I40E_DESC_UNUSED(xdp_ring) < 1 + nr_frags)) {
xdp_ring->tx_stats.tx_busy++;
return I40E_XDP_CONSUMED;
}
- dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE);
- if (dma_mapping_error(xdp_ring->dev, dma))
- return I40E_XDP_CONSUMED;
- tx_bi = &xdp_ring->tx_bi[i];
- tx_bi->bytecount = size;
- tx_bi->gso_segs = 1;
- tx_bi->xdpf = xdpf;
+ tx_head->bytecount = xdp_get_frame_len(xdpf);
+ tx_head->gso_segs = 1;
+ tx_head->xdpf = xdpf;
- /* record length, and DMA address */
- dma_unmap_len_set(tx_bi, len, size);
- dma_unmap_addr_set(tx_bi, dma, dma);
+ for (;;) {
+ dma_addr_t dma;
- tx_desc = I40E_TX_DESC(xdp_ring, i);
- tx_desc->buffer_addr = cpu_to_le64(dma);
- tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC
- | I40E_TXD_CMD,
- 0, size, 0);
+ dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(xdp_ring->dev, dma))
+ goto unmap;
+
+ /* record length, and DMA address */
+ dma_unmap_len_set(tx_bi, len, size);
+ dma_unmap_addr_set(tx_bi, dma, dma);
+
+ tx_desc->buffer_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz =
+ build_ctob(I40E_TX_DESC_CMD_ICRC, 0, size, 0);
+
+ if (++index == xdp_ring->count)
+ index = 0;
+
+ if (i == nr_frags)
+ break;
+
+ tx_bi = &xdp_ring->tx_bi[index];
+ tx_desc = I40E_TX_DESC(xdp_ring, index);
+
+ data = skb_frag_address(&sinfo->frags[i]);
+ size = skb_frag_size(&sinfo->frags[i]);
+ i++;
+ }
+
+ tx_desc->cmd_type_offset_bsz |=
+ cpu_to_le64(I40E_TXD_CMD << I40E_TXD_QW1_CMD_SHIFT);
/* Make certain all of the status bits have been updated
* before next_to_watch is written.
@@ -3724,14 +3744,30 @@ static int i40e_xmit_xdp_ring(struct xdp_frame *xdpf,
smp_wmb();
xdp_ring->xdp_tx_active++;
- i++;
- if (i == xdp_ring->count)
- i = 0;
- tx_bi->next_to_watch = tx_desc;
- xdp_ring->next_to_use = i;
+ tx_head->next_to_watch = tx_desc;
+ xdp_ring->next_to_use = index;
return I40E_XDP_TX;
+
+unmap:
+ for (;;) {
+ tx_bi = &xdp_ring->tx_bi[index];
+ if (dma_unmap_len(tx_bi, len))
+ dma_unmap_page(xdp_ring->dev,
+ dma_unmap_addr(tx_bi, dma),
+ dma_unmap_len(tx_bi, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_bi, len, 0);
+ if (tx_bi == tx_head)
+ break;
+
+ if (!index)
+ index += xdp_ring->count;
+ index--;
+ }
+
+ return I40E_XDP_CONSUMED;
}
/**
--
2.35.1
^ permalink raw reply related [flat|nested] 3+ messages in thread