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net: thunderx: Add support for xdp redirect 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sunil Goutham 2017-11-24 15:03:26 +03:00 committed by David S. Miller
parent b915176102
commit aa136d0c82
3 changed files with 94 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

110
drivers/net/ethernet/cavium/thunder/nicvf_main.c
View File

@ -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)

11
drivers/net/ethernet/cavium/thunder/nicvf_queues.c
View File

@ -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
@ -1623,7 +1624,7 @@ 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;
}

4
drivers/net/ethernet/cavium/thunder/nicvf_queues.h
View File

@ -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)