Commit c7aec596 authored by Tony Nguyen's avatar Tony Nguyen Committed by Jeff Kirsher

ixgbevf: Add XDP support for pass and drop actions

Implement XDP_PASS and XDP_DROP based on the ixgbe implementation.

Based largely on commit 92470808 ("ixgbe: add XDP support for pass and
drop actions").
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 70da6824
/*******************************************************************************
Intel 82599 Virtual Function driver
Copyright(c) 1999 - 2015 Intel Corporation.
Copyright(c) 1999 - 2018 Intel Corporation.
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
......@@ -336,8 +336,13 @@ static int ixgbevf_set_ringparam(struct net_device *netdev,
for (i = 0; i < adapter->num_rx_queues; i++) {
/* clone ring and setup updated count */
rx_ring[i] = *adapter->rx_ring[i];
/* Clear copied XDP RX-queue info */
memset(&rx_ring[i].xdp_rxq, 0,
sizeof(rx_ring[i].xdp_rxq));
rx_ring[i].count = new_rx_count;
err = ixgbevf_setup_rx_resources(&rx_ring[i]);
err = ixgbevf_setup_rx_resources(adapter, &rx_ring[i]);
if (err) {
while (i) {
i--;
......
......@@ -2,7 +2,7 @@
/*******************************************************************************
Intel 82599 Virtual Function driver
Copyright(c) 1999 - 2015 Intel Corporation.
Copyright(c) 1999 - 2018 Intel Corporation.
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
......@@ -35,6 +35,7 @@
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/u64_stats_sync.h>
#include <net/xdp.h>
#include "vf.h"
......@@ -100,6 +101,7 @@ struct ixgbevf_ring {
struct ixgbevf_ring *next;
struct ixgbevf_q_vector *q_vector; /* backpointer to q_vector */
struct net_device *netdev;
struct bpf_prog *xdp_prog;
struct device *dev;
void *desc; /* descriptor ring memory */
dma_addr_t dma; /* phys. address of descriptor ring */
......@@ -120,7 +122,7 @@ struct ixgbevf_ring {
struct ixgbevf_tx_queue_stats tx_stats;
struct ixgbevf_rx_queue_stats rx_stats;
};
struct xdp_rxq_info xdp_rxq;
u64 hw_csum_rx_error;
u8 __iomem *tail;
struct sk_buff *skb;
......@@ -357,6 +359,7 @@ struct ixgbevf_adapter {
/* OS defined structs */
struct net_device *netdev;
struct bpf_prog *xdp_prog;
struct pci_dev *pdev;
/* structs defined in ixgbe_vf.h */
......@@ -443,7 +446,8 @@ void ixgbevf_down(struct ixgbevf_adapter *adapter);
void ixgbevf_reinit_locked(struct ixgbevf_adapter *adapter);
void ixgbevf_reset(struct ixgbevf_adapter *adapter);
void ixgbevf_set_ethtool_ops(struct net_device *netdev);
int ixgbevf_setup_rx_resources(struct ixgbevf_ring *);
int ixgbevf_setup_rx_resources(struct ixgbevf_adapter *adapter,
struct ixgbevf_ring *rx_ring);
int ixgbevf_setup_tx_resources(struct ixgbevf_ring *);
void ixgbevf_free_rx_resources(struct ixgbevf_ring *);
void ixgbevf_free_tx_resources(struct ixgbevf_ring *);
......
/*******************************************************************************
Intel 82599 Virtual Function driver
Copyright(c) 1999 - 2015 Intel Corporation.
Copyright(c) 1999 - 2018 Intel Corporation.
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
......@@ -50,6 +50,9 @@
#include <linux/if_vlan.h>
#include <linux/prefetch.h>
#include <net/mpls.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/atomic.h>
#include "ixgbevf.h"
......@@ -552,19 +555,21 @@ struct ixgbevf_rx_buffer *ixgbevf_get_rx_buffer(struct ixgbevf_ring *rx_ring,
}
static void ixgbevf_put_rx_buffer(struct ixgbevf_ring *rx_ring,
struct ixgbevf_rx_buffer *rx_buffer)
struct ixgbevf_rx_buffer *rx_buffer,
struct sk_buff *skb)
{
if (ixgbevf_can_reuse_rx_page(rx_buffer)) {
/* hand second half of page back to the ring */
ixgbevf_reuse_rx_page(rx_ring, rx_buffer);
} else {
/* We are not reusing the buffer so unmap it and free
* any references we are holding to it
*/
dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
ixgbevf_rx_pg_size(rx_ring),
DMA_FROM_DEVICE,
IXGBEVF_RX_DMA_ATTR);
if (IS_ERR(skb))
/* We are not reusing the buffer so unmap it and free
* any references we are holding to it
*/
dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
ixgbevf_rx_pg_size(rx_ring),
DMA_FROM_DEVICE,
IXGBEVF_RX_DMA_ATTR);
__page_frag_cache_drain(rx_buffer->page,
rx_buffer->pagecnt_bias);
}
......@@ -737,6 +742,10 @@ static bool ixgbevf_cleanup_headers(struct ixgbevf_ring *rx_ring,
union ixgbe_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
/* XDP packets use error pointer so abort at this point */
if (IS_ERR(skb))
return true;
/* verify that the packet does not have any known errors */
if (unlikely(ixgbevf_test_staterr(rx_desc,
IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
......@@ -853,22 +862,23 @@ static void ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring,
static
struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
struct ixgbevf_rx_buffer *rx_buffer,
union ixgbe_adv_rx_desc *rx_desc,
unsigned int size)
struct xdp_buff *xdp,
union ixgbe_adv_rx_desc *rx_desc)
{
void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
unsigned int size = xdp->data_end - xdp->data;
#if (PAGE_SIZE < 8192)
unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = SKB_DATA_ALIGN(size);
unsigned int truesize = SKB_DATA_ALIGN(xdp->data_end -
xdp->data_hard_start);
#endif
unsigned int headlen;
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
/* allocate a skb to store the frags */
......@@ -879,16 +889,18 @@ struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
/* Determine available headroom for copy */
headlen = size;
if (headlen > IXGBEVF_RX_HDR_SIZE)
headlen = eth_get_headlen(va, IXGBEVF_RX_HDR_SIZE);
headlen = eth_get_headlen(xdp->data, IXGBEVF_RX_HDR_SIZE);
/* align pull length to size of long to optimize memcpy performance */
memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
memcpy(__skb_put(skb, headlen), xdp->data,
ALIGN(headlen, sizeof(long)));
/* update all of the pointers */
size -= headlen;
if (size) {
skb_add_rx_frag(skb, 0, rx_buffer->page,
(va + headlen) - page_address(rx_buffer->page),
(xdp->data + headlen) -
page_address(rx_buffer->page),
size, truesize);
#if (PAGE_SIZE < 8192)
rx_buffer->page_offset ^= truesize;
......@@ -912,32 +924,32 @@ static inline void ixgbevf_irq_enable_queues(struct ixgbevf_adapter *adapter,
static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
struct ixgbevf_rx_buffer *rx_buffer,
union ixgbe_adv_rx_desc *rx_desc,
unsigned int size)
struct xdp_buff *xdp,
union ixgbe_adv_rx_desc *rx_desc)
{
void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
#if (PAGE_SIZE < 8192)
unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
SKB_DATA_ALIGN(IXGBEVF_SKB_PAD + size);
SKB_DATA_ALIGN(xdp->data_end -
xdp->data_hard_start);
#endif
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
/* build an skb to around the page buffer */
skb = build_skb(va - IXGBEVF_SKB_PAD, truesize);
/* build an skb around the page buffer */
skb = build_skb(xdp->data_hard_start, truesize);
if (unlikely(!skb))
return NULL;
/* update pointers within the skb to store the data */
skb_reserve(skb, IXGBEVF_SKB_PAD);
__skb_put(skb, size);
skb_reserve(skb, xdp->data - xdp->data_hard_start);
__skb_put(skb, xdp->data_end - xdp->data);
/* update buffer offset */
#if (PAGE_SIZE < 8192)
......@@ -948,6 +960,43 @@ static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
return skb;
}
#define IXGBEVF_XDP_PASS 0
#define IXGBEVF_XDP_CONSUMED 1
static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_ring *rx_ring,
struct xdp_buff *xdp)
{
int result = IXGBEVF_XDP_PASS;
struct bpf_prog *xdp_prog;
u32 act;
rcu_read_lock();
xdp_prog = READ_ONCE(rx_ring->xdp_prog);
if (!xdp_prog)
goto xdp_out;
act = bpf_prog_run_xdp(xdp_prog, xdp);
switch (act) {
case XDP_PASS:
break;
default:
bpf_warn_invalid_xdp_action(act);
/* fallthrough */
case XDP_TX:
case XDP_ABORTED:
trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
/* fallthrough -- handle aborts by dropping packet */
case XDP_DROP:
result = IXGBEVF_XDP_CONSUMED;
break;
}
xdp_out:
rcu_read_unlock();
return ERR_PTR(-result);
}
static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
struct ixgbevf_ring *rx_ring,
int budget)
......@@ -955,10 +1004,13 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
u16 cleaned_count = ixgbevf_desc_unused(rx_ring);
struct sk_buff *skb = rx_ring->skb;
struct xdp_buff xdp;
xdp.rxq = &rx_ring->xdp_rxq;
while (likely(total_rx_packets < budget)) {
union ixgbe_adv_rx_desc *rx_desc;
struct ixgbevf_rx_buffer *rx_buffer;
union ixgbe_adv_rx_desc *rx_desc;
unsigned int size;
/* return some buffers to hardware, one at a time is too slow */
......@@ -981,14 +1033,30 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
rx_buffer = ixgbevf_get_rx_buffer(rx_ring, size);
/* retrieve a buffer from the ring */
if (skb)
if (!skb) {
xdp.data = page_address(rx_buffer->page) +
rx_buffer->page_offset;
xdp_set_data_meta_invalid(&xdp);
xdp.data_hard_start = xdp.data -
ixgbevf_rx_offset(rx_ring);
xdp.data_end = xdp.data + size;
skb = ixgbevf_run_xdp(rx_ring, &xdp);
}
if (IS_ERR(skb)) {
total_rx_packets++;
total_rx_bytes += size;
rx_buffer->pagecnt_bias++;
} else if (skb) {
ixgbevf_add_rx_frag(rx_ring, rx_buffer, skb, size);
else if (ring_uses_build_skb(rx_ring))
} else if (ring_uses_build_skb(rx_ring)) {
skb = ixgbevf_build_skb(rx_ring, rx_buffer,
rx_desc, size);
else
&xdp, rx_desc);
} else {
skb = ixgbevf_construct_skb(rx_ring, rx_buffer,
rx_desc, size);
&xdp, rx_desc);
}
/* exit if we failed to retrieve a buffer */
if (!skb) {
......@@ -997,7 +1065,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
break;
}
ixgbevf_put_rx_buffer(rx_ring, rx_buffer);
ixgbevf_put_rx_buffer(rx_ring, rx_buffer, skb);
cleaned_count++;
/* fetch next buffer in frame if non-eop */
......@@ -3159,11 +3227,13 @@ static int ixgbevf_setup_all_tx_resources(struct ixgbevf_adapter *adapter)
/**
* ixgbevf_setup_rx_resources - allocate Rx resources (Descriptors)
* @adapter: board private structure
* @rx_ring: Rx descriptor ring (for a specific queue) to setup
*
* Returns 0 on success, negative on failure
**/
int ixgbevf_setup_rx_resources(struct ixgbevf_ring *rx_ring)
int ixgbevf_setup_rx_resources(struct ixgbevf_adapter *adapter,
struct ixgbevf_ring *rx_ring)
{
int size;
......@@ -3184,6 +3254,13 @@ int ixgbevf_setup_rx_resources(struct ixgbevf_ring *rx_ring)
if (!rx_ring->desc)
goto err;
/* XDP RX-queue info */
if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, adapter->netdev,
rx_ring->queue_index) < 0)
goto err;
rx_ring->xdp_prog = adapter->xdp_prog;
return 0;
err:
vfree(rx_ring->rx_buffer_info);
......@@ -3207,7 +3284,7 @@ static int ixgbevf_setup_all_rx_resources(struct ixgbevf_adapter *adapter)
int i, err = 0;
for (i = 0; i < adapter->num_rx_queues; i++) {
err = ixgbevf_setup_rx_resources(adapter->rx_ring[i]);
err = ixgbevf_setup_rx_resources(adapter, adapter->rx_ring[i]);
if (!err)
continue;
hw_dbg(&adapter->hw, "Allocation for Rx Queue %u failed\n", i);
......@@ -3232,6 +3309,8 @@ void ixgbevf_free_rx_resources(struct ixgbevf_ring *rx_ring)
{
ixgbevf_clean_rx_ring(rx_ring);
rx_ring->xdp_prog = NULL;
xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
vfree(rx_ring->rx_buffer_info);
rx_ring->rx_buffer_info = NULL;
......@@ -3918,6 +3997,12 @@ static int ixgbevf_change_mtu(struct net_device *netdev, int new_mtu)
int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
int ret;
/* prevent MTU being changed to a size unsupported by XDP */
if (adapter->xdp_prog) {
dev_warn(&adapter->pdev->dev, "MTU cannot be changed while XDP program is loaded\n");
return -EPERM;
}
spin_lock_bh(&adapter->mbx_lock);
/* notify the PF of our intent to use this size of frame */
ret = hw->mac.ops.set_rlpml(hw, max_frame);
......@@ -4101,6 +4186,47 @@ ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
return features;
}
static int ixgbevf_xdp_setup(struct net_device *dev, struct bpf_prog *prog)
{
int i, frame_size = dev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
struct ixgbevf_adapter *adapter = netdev_priv(dev);
struct bpf_prog *old_prog;
/* verify ixgbevf ring attributes are sufficient for XDP */
for (i = 0; i < adapter->num_rx_queues; i++) {
struct ixgbevf_ring *ring = adapter->rx_ring[i];
if (frame_size > ixgbevf_rx_bufsz(ring))
return -EINVAL;
}
old_prog = xchg(&adapter->xdp_prog, prog);
for (i = 0; i < adapter->num_rx_queues; i++)
xchg(&adapter->rx_ring[i]->xdp_prog, adapter->xdp_prog);
if (old_prog)
bpf_prog_put(old_prog);
return 0;
}
static int ixgbevf_xdp(struct net_device *dev, struct netdev_bpf *xdp)
{
struct ixgbevf_adapter *adapter = netdev_priv(dev);
switch (xdp->command) {
case XDP_SETUP_PROG:
return ixgbevf_xdp_setup(dev, xdp->prog);
case XDP_QUERY_PROG:
xdp->prog_attached = !!(adapter->xdp_prog);
xdp->prog_id = adapter->xdp_prog ?
adapter->xdp_prog->aux->id : 0;
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops ixgbevf_netdev_ops = {
.ndo_open = ixgbevf_open,
.ndo_stop = ixgbevf_close,
......@@ -4117,6 +4243,7 @@ static const struct net_device_ops ixgbevf_netdev_ops = {
.ndo_poll_controller = ixgbevf_netpoll,
#endif
.ndo_features_check = ixgbevf_features_check,
.ndo_bpf = ixgbevf_xdp,
};
static void ixgbevf_assign_netdev_ops(struct net_device *dev)
......
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