Commit d678be1d authored by Ioana Radulescu's avatar Ioana Radulescu Committed by David S. Miller
Browse files

dpaa2-eth: add XDP_REDIRECT support



Implement support for the XDP_REDIRECT action.

The redirected frame is transmitted and confirmed on the regular Tx/Tx
conf queues. Frame is marked with the "XDP" type in the software
annotation, since it requires special treatment.

We don't have good hardware support for TX batching, so the
XDP_XMIT_FLUSH flag doesn't make a difference for now; ndo_xdp_xmit
performs the actual Tx operation on the spot.

Signed-off-by: default avatarIoana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: default avatarIoana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3fdf6ba
......@@ -296,6 +296,7 @@ static u32 run_xdp(struct dpaa2_eth_priv *priv,
xdp.data_end = xdp.data + dpaa2_fd_get_len(fd);
xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
xdp_set_data_meta_invalid(&xdp);
xdp.rxq = &ch->xdp_rxq;
xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);
......@@ -328,8 +329,20 @@ static u32 run_xdp(struct dpaa2_eth_priv *priv,
xdp_release_buf(priv, ch, addr);
ch->stats.xdp_drop++;
break;
case XDP_REDIRECT:
dma_unmap_page(priv->net_dev->dev.parent, addr,
DPAA2_ETH_RX_BUF_SIZE, DMA_BIDIRECTIONAL);
ch->buf_count--;
xdp.data_hard_start = vaddr;
err = xdp_do_redirect(priv->net_dev, &xdp, xdp_prog);
if (unlikely(err))
ch->stats.xdp_drop++;
else
ch->stats.xdp_redirect++;
break;
}
ch->xdp.res |= xdp_act;
out:
rcu_read_unlock();
return xdp_act;
......@@ -657,27 +670,35 @@ static int build_single_fd(struct dpaa2_eth_priv *priv,
* dpaa2_eth_tx().
*/
static void free_tx_fd(const struct dpaa2_eth_priv *priv,
struct dpaa2_eth_fq *fq,
const struct dpaa2_fd *fd, bool in_napi)
{
struct device *dev = priv->net_dev->dev.parent;
dma_addr_t fd_addr;
struct sk_buff *skb;
struct sk_buff *skb = NULL;
unsigned char *buffer_start;
struct dpaa2_eth_swa *swa;
u8 fd_format = dpaa2_fd_get_format(fd);
u32 fd_len = dpaa2_fd_get_len(fd);
fd_addr = dpaa2_fd_get_addr(fd);
buffer_start = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
swa = (struct dpaa2_eth_swa *)buffer_start;
if (fd_format == dpaa2_fd_single) {
skb = swa->single.skb;
/* Accessing the skb buffer is safe before dma unmap, because
* we didn't map the actual skb shell.
*/
dma_unmap_single(dev, fd_addr,
skb_tail_pointer(skb) - buffer_start,
DMA_BIDIRECTIONAL);
if (swa->type == DPAA2_ETH_SWA_SINGLE) {
skb = swa->single.skb;
/* Accessing the skb buffer is safe before dma unmap,
* because we didn't map the actual skb shell.
*/
dma_unmap_single(dev, fd_addr,
skb_tail_pointer(skb) - buffer_start,
DMA_BIDIRECTIONAL);
} else {
WARN_ONCE(swa->type != DPAA2_ETH_SWA_XDP, "Wrong SWA type");
dma_unmap_single(dev, fd_addr, swa->xdp.dma_size,
DMA_BIDIRECTIONAL);
}
} else if (fd_format == dpaa2_fd_sg) {
skb = swa->sg.skb;
......@@ -694,6 +715,16 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
return;
}
if (swa->type != DPAA2_ETH_SWA_XDP && in_napi) {
fq->dq_frames++;
fq->dq_bytes += fd_len;
}
if (swa->type == DPAA2_ETH_SWA_XDP) {
xdp_return_frame(swa->xdp.xdpf);
return;
}
/* Get the timestamp value */
if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
struct skb_shared_hwtstamps shhwtstamps;
......@@ -793,7 +824,7 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
if (unlikely(err < 0)) {
percpu_stats->tx_errors++;
/* Clean up everything, including freeing the skb */
free_tx_fd(priv, &fd, false);
free_tx_fd(priv, fq, &fd, false);
} else {
fd_len = dpaa2_fd_get_len(&fd);
percpu_stats->tx_packets++;
......@@ -830,12 +861,9 @@ static void dpaa2_eth_tx_conf(struct dpaa2_eth_priv *priv,
percpu_extras->tx_conf_frames++;
percpu_extras->tx_conf_bytes += fd_len;
fq->dq_frames++;
fq->dq_bytes += fd_len;
/* Check frame errors in the FD field */
fd_errors = dpaa2_fd_get_ctrl(fd) & DPAA2_FD_TX_ERR_MASK;
free_tx_fd(priv, fd, true);
free_tx_fd(priv, fq, fd, true);
if (likely(!fd_errors))
return;
......@@ -1083,6 +1111,7 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
int err;
ch = container_of(napi, struct dpaa2_eth_channel, napi);
ch->xdp.res = 0;
priv = ch->priv;
do {
......@@ -1128,7 +1157,7 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
work_done = max(rx_cleaned, 1);
out:
if (txc_fq) {
if (txc_fq && txc_fq->dq_frames) {
nq = netdev_get_tx_queue(priv->net_dev, txc_fq->flowid);
netdev_tx_completed_queue(nq, txc_fq->dq_frames,
txc_fq->dq_bytes);
......@@ -1136,6 +1165,9 @@ out:
txc_fq->dq_bytes = 0;
}
if (ch->xdp.res & XDP_REDIRECT)
xdp_do_flush_map();
return work_done;
}
......@@ -1730,6 +1762,105 @@ static int dpaa2_eth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
return 0;
}
static int dpaa2_eth_xdp_xmit_frame(struct net_device *net_dev,
struct xdp_frame *xdpf)
{
struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
struct device *dev = net_dev->dev.parent;
struct rtnl_link_stats64 *percpu_stats;
struct dpaa2_eth_drv_stats *percpu_extras;
unsigned int needed_headroom;
struct dpaa2_eth_swa *swa;
struct dpaa2_eth_fq *fq;
struct dpaa2_fd fd;
void *buffer_start, *aligned_start;
dma_addr_t addr;
int err, i;
/* We require a minimum headroom to be able to transmit the frame.
* Otherwise return an error and let the original net_device handle it
*/
needed_headroom = dpaa2_eth_needed_headroom(priv, NULL);
if (xdpf->headroom < needed_headroom)
return -EINVAL;
percpu_stats = this_cpu_ptr(priv->percpu_stats);
percpu_extras = this_cpu_ptr(priv->percpu_extras);
/* Setup the FD fields */
memset(&fd, 0, sizeof(fd));
/* Align FD address, if possible */
buffer_start = xdpf->data - needed_headroom;
aligned_start = PTR_ALIGN(buffer_start - DPAA2_ETH_TX_BUF_ALIGN,
DPAA2_ETH_TX_BUF_ALIGN);
if (aligned_start >= xdpf->data - xdpf->headroom)
buffer_start = aligned_start;
swa = (struct dpaa2_eth_swa *)buffer_start;
/* fill in necessary fields here */
swa->type = DPAA2_ETH_SWA_XDP;
swa->xdp.dma_size = xdpf->data + xdpf->len - buffer_start;
swa->xdp.xdpf = xdpf;
addr = dma_map_single(dev, buffer_start,
swa->xdp.dma_size,
DMA_BIDIRECTIONAL);
if (unlikely(dma_mapping_error(dev, addr))) {
percpu_stats->tx_dropped++;
return -ENOMEM;
}
dpaa2_fd_set_addr(&fd, addr);
dpaa2_fd_set_offset(&fd, xdpf->data - buffer_start);
dpaa2_fd_set_len(&fd, xdpf->len);
dpaa2_fd_set_format(&fd, dpaa2_fd_single);
dpaa2_fd_set_ctrl(&fd, FD_CTRL_PTA);
fq = &priv->fq[smp_processor_id()];
for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
err = priv->enqueue(priv, fq, &fd, 0);
if (err != -EBUSY)
break;
}
percpu_extras->tx_portal_busy += i;
if (unlikely(err < 0)) {
percpu_stats->tx_errors++;
/* let the Rx device handle the cleanup */
return err;
}
percpu_stats->tx_packets++;
percpu_stats->tx_bytes += dpaa2_fd_get_len(&fd);
return 0;
}
static int dpaa2_eth_xdp_xmit(struct net_device *net_dev, int n,
struct xdp_frame **frames, u32 flags)
{
int drops = 0;
int i, err;
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
return -EINVAL;
if (!netif_running(net_dev))
return -ENETDOWN;
for (i = 0; i < n; i++) {
struct xdp_frame *xdpf = frames[i];
err = dpaa2_eth_xdp_xmit_frame(net_dev, xdpf);
if (err) {
xdp_return_frame_rx_napi(xdpf);
drops++;
}
}
return n - drops;
}
static const struct net_device_ops dpaa2_eth_ops = {
.ndo_open = dpaa2_eth_open,
.ndo_start_xmit = dpaa2_eth_tx,
......@@ -1741,6 +1872,7 @@ static const struct net_device_ops dpaa2_eth_ops = {
.ndo_do_ioctl = dpaa2_eth_ioctl,
.ndo_change_mtu = dpaa2_eth_change_mtu,
.ndo_bpf = dpaa2_eth_xdp,
.ndo_xdp_xmit = dpaa2_eth_xdp_xmit,
};
static void cdan_cb(struct dpaa2_io_notification_ctx *ctx)
......@@ -2353,6 +2485,21 @@ static int setup_rx_flow(struct dpaa2_eth_priv *priv,
return err;
}
/* xdp_rxq setup */
err = xdp_rxq_info_reg(&fq->channel->xdp_rxq, priv->net_dev,
fq->flowid);
if (err) {
dev_err(dev, "xdp_rxq_info_reg failed\n");
return err;
}
err = xdp_rxq_info_reg_mem_model(&fq->channel->xdp_rxq,
MEM_TYPE_PAGE_ORDER0, NULL);
if (err) {
dev_err(dev, "xdp_rxq_info_reg_mem_model failed\n");
return err;
}
return 0;
}
......
......@@ -95,6 +95,7 @@
enum dpaa2_eth_swa_type {
DPAA2_ETH_SWA_SINGLE,
DPAA2_ETH_SWA_SG,
DPAA2_ETH_SWA_XDP,
};
/* Must keep this struct smaller than DPAA2_ETH_SWA_SIZE */
......@@ -110,6 +111,10 @@ struct dpaa2_eth_swa {
int num_sg;
int sgt_size;
} sg;
struct {
int dma_size;
struct xdp_frame *xdpf;
} xdp;
};
};
......@@ -273,6 +278,7 @@ struct dpaa2_eth_ch_stats {
__u64 xdp_drop;
__u64 xdp_tx;
__u64 xdp_tx_err;
__u64 xdp_redirect;
};
/* Maximum number of queues associated with a DPNI */
......@@ -312,6 +318,7 @@ struct dpaa2_eth_ch_xdp {
struct bpf_prog *prog;
u64 drop_bufs[DPAA2_ETH_BUFS_PER_CMD];
int drop_cnt;
unsigned int res;
};
struct dpaa2_eth_channel {
......@@ -326,6 +333,7 @@ struct dpaa2_eth_channel {
int buf_count;
struct dpaa2_eth_ch_stats stats;
struct dpaa2_eth_ch_xdp xdp;
struct xdp_rxq_info xdp_rxq;
};
struct dpaa2_eth_dist_fields {
......@@ -446,6 +454,12 @@ unsigned int dpaa2_eth_needed_headroom(struct dpaa2_eth_priv *priv,
{
unsigned int headroom = DPAA2_ETH_SWA_SIZE;
/* If we don't have an skb (e.g. XDP buffer), we only need space for
* the software annotation area
*/
if (!skb)
return headroom;
/* For non-linear skbs we have no headroom requirement, as we build a
* SG frame with a newly allocated SGT buffer
*/
......
......@@ -48,6 +48,7 @@ static char dpaa2_ethtool_extras[][ETH_GSTRING_LEN] = {
"[drv] xdp drop",
"[drv] xdp tx",
"[drv] xdp tx errors",
"[drv] xdp redirect",
/* FQ stats */
"[qbman] rx pending frames",
"[qbman] rx pending bytes",
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment