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Message-Id: <d8e3744f060ee11d5069bfd0f581f02d0ecb5e08.1657093744.git.lorenzo@kernel.org>
Date: Wed, 6 Jul 2022 09:54:19 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, intel-wired-lan@...ts.osuosl.org,
lorenzo.bianconi@...hat.com, magnus.karlsson@...el.com,
jbrouer@...hat.com
Subject: [PATCH net-next] igc: add xdp frags support to ndo_xdp_xmit
Add the capability to map non-linear xdp frames in XDP_TX and
ndo_xdp_xmit callback.
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
Please note this patch is only compiled tested since I do not have
access to a igc NIC
---
drivers/net/ethernet/intel/igc/igc_main.c | 128 ++++++++++++++--------
1 file changed, 83 insertions(+), 45 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index ae17af44fe02..71657d03da03 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2129,65 +2129,102 @@ static bool igc_alloc_rx_buffers_zc(struct igc_ring *ring, u16 count)
return ok;
}
-static int igc_xdp_init_tx_buffer(struct igc_tx_buffer *buffer,
- struct xdp_frame *xdpf,
- struct igc_ring *ring)
-{
- dma_addr_t dma;
-
- dma = dma_map_single(ring->dev, xdpf->data, xdpf->len, DMA_TO_DEVICE);
- if (dma_mapping_error(ring->dev, dma)) {
- netdev_err_once(ring->netdev, "Failed to map DMA for TX\n");
- return -ENOMEM;
- }
-
- buffer->type = IGC_TX_BUFFER_TYPE_XDP;
- buffer->xdpf = xdpf;
- buffer->protocol = 0;
- buffer->bytecount = xdpf->len;
- buffer->gso_segs = 1;
- buffer->time_stamp = jiffies;
- dma_unmap_len_set(buffer, len, xdpf->len);
- dma_unmap_addr_set(buffer, dma, dma);
- return 0;
-}
-
/* This function requires __netif_tx_lock is held by the caller. */
static int igc_xdp_init_tx_descriptor(struct igc_ring *ring,
struct xdp_frame *xdpf)
{
- struct igc_tx_buffer *buffer;
- union igc_adv_tx_desc *desc;
- u32 cmd_type, olinfo_status;
- int err;
+ 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 count, index = ring->next_to_use;
+ struct igc_tx_buffer *head = &ring->tx_buffer_info[index];
+ struct igc_tx_buffer *buffer = head;
+ union igc_adv_tx_desc *desc = IGC_TX_DESC(ring, index);
+ u32 olinfo_status, len = xdpf->len, cmd_type;
+ void *data = xdpf->data;
+ u16 i;
- if (!igc_desc_unused(ring))
- return -EBUSY;
+ count = TXD_USE_COUNT(len);
+ for (i = 0; i < nr_frags; i++)
+ count += TXD_USE_COUNT(skb_frag_size(&sinfo->frags[i]));
- buffer = &ring->tx_buffer_info[ring->next_to_use];
- err = igc_xdp_init_tx_buffer(buffer, xdpf, ring);
- if (err)
- return err;
+ if (igc_maybe_stop_tx(ring, count + 3)) {
+ /* this is a hard error */
+ return -EBUSY;
+ }
- cmd_type = IGC_ADVTXD_DTYP_DATA | IGC_ADVTXD_DCMD_DEXT |
- IGC_ADVTXD_DCMD_IFCS | IGC_TXD_DCMD |
- buffer->bytecount;
- olinfo_status = buffer->bytecount << IGC_ADVTXD_PAYLEN_SHIFT;
+ i = 0;
+ head->bytecount = xdp_get_frame_len(xdpf);
+ head->type = IGC_TX_BUFFER_TYPE_XDP;
+ head->gso_segs = 1;
+ head->xdpf = xdpf;
- desc = IGC_TX_DESC(ring, ring->next_to_use);
- desc->read.cmd_type_len = cpu_to_le32(cmd_type);
+ olinfo_status = head->bytecount << IGC_ADVTXD_PAYLEN_SHIFT;
desc->read.olinfo_status = cpu_to_le32(olinfo_status);
- desc->read.buffer_addr = cpu_to_le64(dma_unmap_addr(buffer, dma));
- netdev_tx_sent_queue(txring_txq(ring), buffer->bytecount);
+ for (;;) {
+ dma_addr_t dma;
- buffer->next_to_watch = desc;
+ dma = dma_map_single(ring->dev, data, len, DMA_TO_DEVICE);
+ if (dma_mapping_error(ring->dev, dma)) {
+ netdev_err_once(ring->netdev,
+ "Failed to map DMA for TX\n");
+ goto unmap;
+ }
- ring->next_to_use++;
- if (ring->next_to_use == ring->count)
- ring->next_to_use = 0;
+ dma_unmap_len_set(buffer, len, len);
+ dma_unmap_addr_set(buffer, dma, dma);
+
+ cmd_type = IGC_ADVTXD_DTYP_DATA | IGC_ADVTXD_DCMD_DEXT |
+ IGC_ADVTXD_DCMD_IFCS | len;
+
+ desc->read.cmd_type_len = cpu_to_le32(cmd_type);
+ desc->read.buffer_addr = cpu_to_le64(dma);
+
+ buffer->protocol = 0;
+
+ if (++index == ring->count)
+ index = 0;
+
+ if (i == nr_frags)
+ break;
+
+ buffer = &ring->tx_buffer_info[index];
+ desc = IGC_TX_DESC(ring, index);
+ desc->read.olinfo_status = 0;
+
+ data = skb_frag_address(&sinfo->frags[i]);
+ len = skb_frag_size(&sinfo->frags[i]);
+ i++;
+ }
+ desc->read.cmd_type_len |= cpu_to_le32(IGC_TXD_DCMD);
+
+ netdev_tx_sent_queue(txring_txq(ring), head->bytecount);
+ /* set the timestamp */
+ head->time_stamp = jiffies;
+ /* set next_to_watch value indicating a packet is present */
+ head->next_to_watch = desc;
+ ring->next_to_use = index;
return 0;
+
+unmap:
+ for (;;) {
+ buffer = &ring->tx_buffer_info[index];
+ if (dma_unmap_len(buffer, len))
+ dma_unmap_page(ring->dev,
+ dma_unmap_addr(buffer, dma),
+ dma_unmap_len(buffer, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(buffer, len, 0);
+ if (buffer == head)
+ break;
+
+ if (!index)
+ index += ring->count;
+ index--;
+ }
+
+ return -ENOMEM;
}
static struct igc_ring *igc_xdp_get_tx_ring(struct igc_adapter *adapter,
@@ -2369,6 +2406,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
xdp_prepare_buff(&xdp, pktbuf - igc_rx_offset(rx_ring),
igc_rx_offset(rx_ring) + pkt_offset,
size, true);
+ xdp_buff_clear_frags_flag(&xdp);
skb = igc_xdp_run_prog(adapter, &xdp);
}
--
2.36.1
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