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Subject[PATCH net-next] net: thunderx: Add support for xdp redirect
Date
From: Sunil Goutham <sgoutham@cavium.com>

This patch adds support for XDP_REDIRECT. Flush is not
yet supported.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: cjacob <cjacob@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@cavium.com>
---
drivers/net/ethernet/cavium/thunder/nicvf_main.c | 110 ++++++++++++++++-----
drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 11 ++-
drivers/net/ethernet/cavium/thunder/nicvf_queues.h | 4 +
3 files changed, 94 insertions(+), 31 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index a063c36c4c58..b82e28262c57 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -65,6 +65,11 @@ module_param(cpi_alg, int, S_IRUGO);
MODULE_PARM_DESC(cpi_alg,
"PFC algorithm (0=none, 1=VLAN, 2=VLAN16, 3=IP Diffserv)");

+struct nicvf_xdp_tx {
+ u64 dma_addr;
+ u8 qidx;
+};
+
static inline u8 nicvf_netdev_qidx(struct nicvf *nic, u8 qidx)
{
if (nic->sqs_mode)
@@ -500,14 +505,29 @@ static int nicvf_init_resources(struct nicvf *nic)
return 0;
}

+static void nicvf_unmap_page(struct nicvf *nic, struct page *page, u64 dma_addr)
+{
+ /* Check if it's a recycled page, if not unmap the DMA mapping.
+ * Recycled page holds an extra reference.
+ */
+ if (page_ref_count(page) == 1) {
+ dma_addr &= PAGE_MASK;
+ dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
+ RCV_FRAG_LEN + XDP_HEADROOM,
+ DMA_FROM_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ }
+}
+
static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
struct cqe_rx_t *cqe_rx, struct snd_queue *sq,
struct sk_buff **skb)
{
struct xdp_buff xdp;
struct page *page;
+ struct nicvf_xdp_tx *xdp_tx = NULL;
u32 action;
- u16 len, offset = 0;
+ u16 len, err, offset = 0;
u64 dma_addr, cpu_addr;
void *orig_data;

@@ -521,7 +541,7 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
cpu_addr = (u64)phys_to_virt(cpu_addr);
page = virt_to_page((void *)cpu_addr);

- xdp.data_hard_start = page_address(page);
+ xdp.data_hard_start = page_address(page) + RCV_BUF_HEADROOM;
xdp.data = (void *)cpu_addr;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + len;
@@ -540,18 +560,7 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,

switch (action) {
case XDP_PASS:
- /* Check if it's a recycled page, if not
- * unmap the DMA mapping.
- *
- * Recycled page holds an extra reference.
- */
- if (page_ref_count(page) == 1) {
- dma_addr &= PAGE_MASK;
- dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
- RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
- DMA_FROM_DEVICE,
- DMA_ATTR_SKIP_CPU_SYNC);
- }
+ nicvf_unmap_page(nic, page, dma_addr);

/* Build SKB and pass on packet to network stack */
*skb = build_skb(xdp.data,
@@ -564,6 +573,20 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
case XDP_TX:
nicvf_xdp_sq_append_pkt(nic, sq, (u64)xdp.data, dma_addr, len);
return true;
+ case XDP_REDIRECT:
+ /* Save DMA address for use while transmitting */
+ xdp_tx = (struct nicvf_xdp_tx *)page_address(page);
+ xdp_tx->dma_addr = dma_addr;
+ xdp_tx->qidx = nicvf_netdev_qidx(nic, cqe_rx->rq_idx);
+
+ err = xdp_do_redirect(nic->pnicvf->netdev, &xdp, prog);
+ if (!err)
+ return true;
+
+ /* Free the page on error */
+ nicvf_unmap_page(nic, page, dma_addr);
+ put_page(page);
+ break;
default:
bpf_warn_invalid_xdp_action(action);
/* fall through */
@@ -571,18 +594,7 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
trace_xdp_exception(nic->netdev, prog, action);
/* fall through */
case XDP_DROP:
- /* Check if it's a recycled page, if not
- * unmap the DMA mapping.
- *
- * Recycled page holds an extra reference.
- */
- if (page_ref_count(page) == 1) {
- dma_addr &= PAGE_MASK;
- dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
- RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
- DMA_FROM_DEVICE,
- DMA_ATTR_SKIP_CPU_SYNC);
- }
+ nicvf_unmap_page(nic, page, dma_addr);
put_page(page);
return true;
}
@@ -1764,6 +1776,50 @@ static int nicvf_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
}
}

+static int nicvf_xdp_xmit(struct net_device *netdev, struct xdp_buff *xdp)
+{
+ struct nicvf *nic = netdev_priv(netdev);
+ struct nicvf *snic = nic;
+ struct nicvf_xdp_tx *xdp_tx;
+ struct snd_queue *sq;
+ struct page *page;
+ int err, qidx;
+
+ if (!netif_running(netdev) || !nic->xdp_prog)
+ return -EINVAL;
+
+ page = virt_to_page(xdp->data);
+ xdp_tx = (struct nicvf_xdp_tx *)page_address(page);
+ qidx = xdp_tx->qidx;
+
+ if (xdp_tx->qidx >= nic->xdp_tx_queues)
+ return -EINVAL;
+
+ /* Get secondary Qset's info */
+ if (xdp_tx->qidx >= MAX_SND_QUEUES_PER_QS) {
+ qidx = xdp_tx->qidx / MAX_SND_QUEUES_PER_QS;
+ snic = (struct nicvf *)nic->snicvf[qidx - 1];
+ if (!snic)
+ return -EINVAL;
+ qidx = xdp_tx->qidx % MAX_SND_QUEUES_PER_QS;
+ }
+
+ sq = &snic->qs->sq[qidx];
+ err = nicvf_xdp_sq_append_pkt(snic, sq, (u64)xdp->data,
+ xdp_tx->dma_addr,
+ xdp->data_end - xdp->data);
+ if (err)
+ return -ENOMEM;
+
+ nicvf_xdp_sq_doorbell(snic, sq, qidx);
+ return 0;
+}
+
+static void nicvf_xdp_flush(struct net_device *dev)
+{
+ return;
+}
+
static const struct net_device_ops nicvf_netdev_ops = {
.ndo_open = nicvf_open,
.ndo_stop = nicvf_stop,
@@ -1775,6 +1831,8 @@ static const struct net_device_ops nicvf_netdev_ops = {
.ndo_fix_features = nicvf_fix_features,
.ndo_set_features = nicvf_set_features,
.ndo_bpf = nicvf_xdp,
+ .ndo_xdp_xmit = nicvf_xdp_xmit,
+ .ndo_xdp_flush = nicvf_xdp_flush,
};

static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index d4496e9afcdf..c47817ff5d55 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -204,7 +204,7 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, struct rbdr *rbdr,

/* Reserve space for header modifications by BPF program */
if (rbdr->is_xdp)
- buf_len += XDP_PACKET_HEADROOM;
+ buf_len += XDP_HEADROOM;

/* Check if it's recycled */
if (pgcache)
@@ -224,8 +224,9 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, struct rbdr *rbdr,
nic->rb_page = NULL;
return -ENOMEM;
}
+
if (pgcache)
- pgcache->dma_addr = *rbuf + XDP_PACKET_HEADROOM;
+ pgcache->dma_addr = *rbuf + XDP_HEADROOM;
nic->rb_page_offset += buf_len;
}

@@ -1236,7 +1237,7 @@ int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq,
int qentry;

if (subdesc_cnt > sq->xdp_free_cnt)
- return 0;
+ return -1;

qentry = nicvf_get_sq_desc(sq, subdesc_cnt);

@@ -1247,7 +1248,7 @@ int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq,

sq->xdp_desc_cnt += subdesc_cnt;

- return 1;
+ return 0;
}

/* Calculate no of SQ subdescriptors needed to transmit all
@@ -1624,7 +1625,7 @@ static void nicvf_unmap_rcv_buffer(struct nicvf *nic, u64 dma_addr,
if (page_ref_count(page) != 1)
return;

- len += XDP_PACKET_HEADROOM;
+ len += XDP_HEADROOM;
/* Receive buffers in XDP mode are mapped from page start */
dma_addr &= PAGE_MASK;
}
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
index 67d1a3230773..178ab6e8e3c5 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
@@ -11,6 +11,7 @@

#include <linux/netdevice.h>
#include <linux/iommu.h>
+#include <linux/bpf.h>
#include "q_struct.h"

#define MAX_QUEUE_SET 128
@@ -92,6 +93,9 @@
#define RCV_FRAG_LEN (SKB_DATA_ALIGN(DMA_BUFFER_LEN + NET_SKB_PAD) + \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

+#define RCV_BUF_HEADROOM 128 /* To store dma address for XDP redirect */
+#define XDP_HEADROOM (XDP_PACKET_HEADROOM + RCV_BUF_HEADROOM)
+
#define MAX_CQES_FOR_TX ((SND_QUEUE_LEN / MIN_SQ_DESC_PER_PKT_XMIT) * \
MAX_CQE_PER_PKT_XMIT)

--
2.15.0
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