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Date: Tue, 7 Feb 2023 13:00:57 -0800
From: Praveen Kaligineedi <pkaligineedi@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org,
Praveen Kaligineedi <pkaligineedi@...gle.com>,
Jeroen de Borst <jeroendb@...gle.com>
Subject: [PATCH net-next 3/4] gve: Add XDP REDIRECT support for GQI-QPL format
Add support for XDP REDIRECT action.
This patch contains the following changes:
1) Support for XDP REDIRECT action on rx
2) ndo_xdp_xmit callback support
Signed-off-by: Praveen Kaligineedi <pkaligineedi@...gle.com>
Reviewed-by: Jeroen de Borst <jeroendb@...gle.com>
---
drivers/net/ethernet/google/gve/gve.h | 13 ++++-
drivers/net/ethernet/google/gve/gve_ethtool.c | 26 ++++++----
drivers/net/ethernet/google/gve/gve_main.c | 17 +++++++
drivers/net/ethernet/google/gve/gve_rx.c | 45 +++++++++++++++--
drivers/net/ethernet/google/gve/gve_tx.c | 48 +++++++++++++++++--
5 files changed, 132 insertions(+), 17 deletions(-)
diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index 8352f4c0e8d1..f89b1278db70 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -236,6 +236,7 @@ struct gve_rx_ring {
u64 rx_frag_alloc_cnt; /* free-running count of rx page allocations */
u64 xdp_tx_errors;
u64 xdp_redirect_errors;
+ u64 xdp_alloc_fails;
u64 xdp_actions[GVE_XDP_ACTIONS];
u32 q_num; /* queue index */
u32 ntfy_id; /* notification block index */
@@ -247,6 +248,7 @@ struct gve_rx_ring {
/* XDP stuff */
struct xdp_rxq_info xdp_rxq;
+ struct page_frag_cache page_cache;
};
/* A TX desc ring entry */
@@ -267,7 +269,10 @@ struct gve_tx_iovec {
* ring entry but only used for a pkt_desc not a seg_desc
*/
struct gve_tx_buffer_state {
- struct sk_buff *skb; /* skb for this pkt */
+ union {
+ struct sk_buff *skb; /* skb for this pkt */
+ struct xdp_frame *xdp_frame; /* xdp_frame */
+ };
struct {
u16 size; /* size of xmitted xdp pkt */
} xdp;
@@ -464,6 +469,8 @@ struct gve_tx_ring {
dma_addr_t q_resources_bus; /* dma address of the queue resources */
dma_addr_t complq_bus_dqo; /* dma address of the dqo.compl_ring */
struct u64_stats_sync statss; /* sync stats for 32bit archs */
+ u64 xdp_xmit;
+ u64 xdp_xmit_errors;
} ____cacheline_aligned;
/* Wraps the info for one irq including the napi struct and the queues
@@ -889,8 +896,10 @@ void gve_free_page(struct device *dev, struct page *page, dma_addr_t dma,
enum dma_data_direction);
/* tx handling */
netdev_tx_t gve_tx(struct sk_buff *skb, struct net_device *dev);
+int gve_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+ u32 flags);
int gve_xdp_xmit_one(struct gve_priv *priv, struct gve_tx_ring *tx,
- void *data, int len, u32 flags);
+ void *data, int len, void *frame_p, u32 flags);
bool gve_tx_poll(struct gve_notify_block *block, int budget);
bool gve_xdp_poll(struct gve_notify_block *block, int budget);
int gve_tx_alloc_rings(struct gve_priv *priv);
diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c
index d2f0b53eacbb..57940f90c6be 100644
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c
+++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
@@ -56,13 +56,14 @@ static const char gve_gstrings_rx_stats[][ETH_GSTRING_LEN] = {
"rx_drops_packet_over_mru[%u]", "rx_drops_invalid_checksum[%u]",
"rx_xdp_aborted[%u]", "rx_xdp_drop[%u]", "rx_xdp_pass[%u]",
"rx_xdp_tx[%u]", "rx_xdp_redirect[%u]",
- "rx_xdp_tx_errors[%u]", "rx_xdp_redirect_errors[%u]",
+ "rx_xdp_tx_errors[%u]", "rx_xdp_redirect_errors[%u]", "rx_xdp_alloc_fails[%u]",
};
static const char gve_gstrings_tx_stats[][ETH_GSTRING_LEN] = {
"tx_posted_desc[%u]", "tx_completed_desc[%u]", "tx_consumed_desc[%u]", "tx_bytes[%u]",
"tx_wake[%u]", "tx_stop[%u]", "tx_event_counter[%u]",
"tx_dma_mapping_error[%u]",
+ "tx_xdp_xmit[%u]", "tx_xdp_xmit_errors[%u]"
};
static const char gve_gstrings_adminq_stats[][ETH_GSTRING_LEN] = {
@@ -312,9 +313,10 @@ gve_get_ethtool_stats(struct net_device *netdev,
data[i + j] = rx->xdp_actions[j];
data[i + j++] = rx->xdp_tx_errors;
data[i + j++] = rx->xdp_redirect_errors;
+ data[i + j++] = rx->xdp_alloc_fails;
} while (u64_stats_fetch_retry(&priv->rx[ring].statss,
start));
- i += GVE_XDP_ACTIONS + 2; /* XDP rx counters */
+ i += GVE_XDP_ACTIONS + 3; /* XDP rx counters */
}
} else {
i += priv->rx_cfg.num_queues * NUM_GVE_RX_CNTS;
@@ -370,13 +372,21 @@ gve_get_ethtool_stats(struct net_device *netdev,
if (skip_nic_stats) {
/* skip NIC tx stats */
i += NIC_TX_STATS_REPORT_NUM;
- continue;
- }
- for (j = 0; j < NIC_TX_STATS_REPORT_NUM; j++) {
- u64 value =
- be64_to_cpu(report_stats[tx_qid_to_stats_idx[ring] + j].value);
- data[i++] = value;
+ } else {
+ stats_idx = tx_qid_to_stats_idx[ring];
+ for (j = 0; j < NIC_TX_STATS_REPORT_NUM; j++) {
+ u64 value =
+ be64_to_cpu(report_stats[stats_idx + j].value);
+ data[i++] = value;
+ }
}
+ do {
+ start = u64_stats_fetch_begin(&priv->tx[ring].statss);
+ data[i] = tx->xdp_xmit;
+ data[i + 1] = tx->xdp_xmit_errors;
+ } while (u64_stats_fetch_retry(&priv->tx[ring].statss,
+ start));
+ i += 2; /* XDP tx counters */
}
} else {
i += num_tx_queues * NUM_GVE_TX_CNTS;
diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 5050aa3aa1c3..4398e5887f3b 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -1015,6 +1015,21 @@ static void gve_unreg_xdp_info(struct gve_priv *priv)
}
}
+static void gve_drain_page_cache(struct gve_priv *priv)
+{
+ struct page_frag_cache *nc;
+ int i;
+
+ for (i = 0; i < priv->rx_cfg.num_queues; i++) {
+ nc = &priv->rx[i].page_cache;
+ if (nc->va) {
+ __page_frag_cache_drain(virt_to_page(nc->va),
+ nc->pagecnt_bias);
+ nc->va = NULL;
+ }
+ }
+}
+
static int gve_open(struct net_device *dev)
{
struct gve_priv *priv = netdev_priv(dev);
@@ -1098,6 +1113,7 @@ static int gve_close(struct net_device *dev)
netif_carrier_off(dev);
if (gve_get_device_rings_ok(priv)) {
gve_turndown(priv);
+ gve_drain_page_cache(priv);
err = gve_destroy_rings(priv);
if (err)
goto err;
@@ -1409,6 +1425,7 @@ static const struct net_device_ops gve_netdev_ops = {
.ndo_tx_timeout = gve_tx_timeout,
.ndo_set_features = gve_set_features,
.ndo_bpf = gve_xdp,
+ .ndo_xdp_xmit = gve_xdp_xmit,
};
static void gve_handle_status(struct gve_priv *priv, u32 status)
diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index 3785bc150546..ea833388f895 100644
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -593,6 +593,35 @@ static struct sk_buff *gve_rx_skb(struct gve_priv *priv, struct gve_rx_ring *rx,
return skb;
}
+static int gve_xdp_redirect(struct net_device *dev, struct gve_rx_ring *rx,
+ struct xdp_buff *orig, struct bpf_prog *xdp_prog)
+{
+ int total_len, len = orig->data_end - orig->data;
+ int headroom = XDP_PACKET_HEADROOM;
+ struct xdp_buff new;
+ void *frame;
+ int err;
+
+ total_len = headroom + SKB_DATA_ALIGN(len) +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+ frame = page_frag_alloc(&rx->page_cache, total_len, GFP_ATOMIC);
+ if (!frame) {
+ u64_stats_update_begin(&rx->statss);
+ rx->xdp_alloc_fails++;
+ u64_stats_update_end(&rx->statss);
+ return -ENOMEM;
+ }
+ xdp_init_buff(&new, total_len, &rx->xdp_rxq);
+ xdp_prepare_buff(&new, frame, headroom, len, false);
+ memcpy(new.data, orig->data, len);
+
+ err = xdp_do_redirect(dev, &new, xdp_prog);
+ if (err)
+ page_frag_free(frame);
+
+ return err;
+}
+
static void gve_xdp_done(struct gve_priv *priv, struct gve_rx_ring *rx,
struct xdp_buff *xdp, struct bpf_prog *xprog,
int xdp_act)
@@ -611,7 +640,7 @@ static void gve_xdp_done(struct gve_priv *priv, struct gve_rx_ring *rx,
tx = &priv->tx[tx_qid];
spin_lock(&tx->xdp_lock);
err = gve_xdp_xmit_one(priv, tx, xdp->data,
- xdp->data_end - xdp->data,
+ xdp->data_end - xdp->data, NULL,
XDP_XMIT_FLUSH);
spin_unlock(&tx->xdp_lock);
@@ -622,9 +651,13 @@ static void gve_xdp_done(struct gve_priv *priv, struct gve_rx_ring *rx,
}
break;
case XDP_REDIRECT:
- u64_stats_update_begin(&rx->statss);
- rx->xdp_redirect_errors++;
- u64_stats_update_end(&rx->statss);
+ err = gve_xdp_redirect(priv->dev, rx, xdp, xprog);
+
+ if (unlikely(err)) {
+ u64_stats_update_begin(&rx->statss);
+ rx->xdp_redirect_errors++;
+ u64_stats_update_end(&rx->statss);
+ }
break;
}
u64_stats_update_begin(&rx->statss);
@@ -844,6 +877,7 @@ static bool gve_rx_refill_buffers(struct gve_priv *priv, struct gve_rx_ring *rx)
static int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
netdev_features_t feat)
{
+ u64 xdp_redirects = rx->xdp_actions[XDP_REDIRECT];
struct gve_rx_ctx *ctx = &rx->ctx;
struct gve_priv *priv = rx->gve;
struct gve_rx_cnts cnts = {0};
@@ -891,6 +925,9 @@ static int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
u64_stats_update_end(&rx->statss);
}
+ if (xdp_redirects != rx->xdp_actions[XDP_REDIRECT])
+ xdp_do_flush();
+
/* restock ring slots */
if (!rx->data.raw_addressing) {
/* In QPL mode buffs are refilled as the desc are processed */
diff --git a/drivers/net/ethernet/google/gve/gve_tx.c b/drivers/net/ethernet/google/gve/gve_tx.c
index a2fc4b074f52..b5261985a1fc 100644
--- a/drivers/net/ethernet/google/gve/gve_tx.c
+++ b/drivers/net/ethernet/google/gve/gve_tx.c
@@ -666,7 +666,7 @@ netdev_tx_t gve_tx(struct sk_buff *skb, struct net_device *dev)
}
static int gve_tx_fill_xdp(struct gve_priv *priv, struct gve_tx_ring *tx,
- void *data, int len)
+ void *data, int len, void *frame_p)
{
int pad, nfrags, ndescs, iovi, offset;
struct gve_tx_buffer_state *info;
@@ -676,6 +676,7 @@ static int gve_tx_fill_xdp(struct gve_priv *priv, struct gve_tx_ring *tx,
if (pad >= GVE_XDP_PADDING)
pad = 0;
info = &tx->info[reqi & tx->mask];
+ info->xdp_frame = frame_p;
info->xdp.size = len;
nfrags = gve_tx_alloc_fifo(&tx->tx_fifo, pad + len,
@@ -710,15 +711,51 @@ static int gve_tx_fill_xdp(struct gve_priv *priv, struct gve_tx_ring *tx,
return ndescs;
}
+int gve_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+ u32 flags)
+{
+ struct gve_priv *priv = netdev_priv(dev);
+ struct gve_tx_ring *tx;
+ int i, err = 0, qid;
+
+ if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
+ return -EINVAL;
+
+ qid = gve_xdp_tx_queue_id(priv,
+ smp_processor_id() % priv->num_xdp_queues);
+
+ tx = &priv->tx[qid];
+
+ spin_lock(&tx->xdp_lock);
+ for (i = 0; i < n; i++) {
+ err = gve_xdp_xmit_one(priv, tx, frames[i]->data,
+ frames[i]->len, frames[i], 0);
+ if (err)
+ break;
+ }
+
+ if (flags & XDP_XMIT_FLUSH)
+ gve_tx_put_doorbell(priv, tx->q_resources, tx->req);
+
+ spin_unlock(&tx->xdp_lock);
+
+ u64_stats_update_begin(&tx->statss);
+ tx->xdp_xmit += n;
+ tx->xdp_xmit_errors += n - i;
+ u64_stats_update_end(&tx->statss);
+
+ return i ? i : err;
+}
+
int gve_xdp_xmit_one(struct gve_priv *priv, struct gve_tx_ring *tx,
- void *data, int len, u32 flags)
+ void *data, int len, void *frame_p, u32 flags)
{
int nsegs;
if (!gve_can_tx(tx, len))
return -EBUSY;
- nsegs = gve_tx_fill_xdp(priv, tx, data, len);
+ nsegs = gve_tx_fill_xdp(priv, tx, data, len, frame_p);
tx->req += nsegs;
if (flags & XDP_XMIT_FLUSH)
@@ -748,6 +785,11 @@ static int gve_clean_xdp_done(struct gve_priv *priv, struct gve_tx_ring *tx,
pkts++;
info->xdp.size = 0;
+ if (info->xdp_frame) {
+ xdp_return_frame(info->xdp_frame);
+ info->xdp_frame = NULL;
+ }
+
/* FIFO free */
for (i = 0; i < ARRAY_SIZE(info->iov); i++) {
space_freed += info->iov[i].iov_len + info->iov[i].iov_padding;
--
2.39.1.581.gbfd45094c4-goog
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