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authorIoana Radulescu <ruxandra.radulescu@nxp.com>2019-03-01 17:47:24 +0000
committerDavid S. Miller <davem@davemloft.net>2019-03-03 20:41:18 -0800
commitd678be1dc1ec59eee1f733ff603f601469ff368d (patch)
tree12923e831755129843737322963c37ff0bf5e4fe /drivers/net
parentdpaa2-eth: Add software annotation types (diff)
downloadlinux-dev-d678be1dc1ec59eee1f733ff603f601469ff368d.tar.xz
linux-dev-d678be1dc1ec59eee1f733ff603f601469ff368d.zip
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: Ioana Ciornei <ioana.ciornei@nxp.com> Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c175
-rw-r--r--drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h14
-rw-r--r--drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c1
3 files changed, 176 insertions, 14 deletions
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 3acfd8cb437a..81085e70c239 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -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;
}
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index 423976d97fa6..7879622aa3e6 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -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
*/
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c
index a7389e722c49..591dfcf76adb 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c
@@ -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",