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[RFC] Generic metadata AF XDP #7

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[RFC] Generic metadata AF XDP #7

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5b67c13
uapi: add metadata flag to xdp flags
mswiatko Jul 21, 2021
2590b71
net: include xdp generic metadata definition
mswiatko Aug 10, 2021
c354ec1
ice: use xdp generic metadata
mswiatko Aug 10, 2021
d7691ff
libbpf: Return non-null error on failures in libbpf_find_prog_btf_id()
qmonnet Jul 29, 2021
caca8ad
libbpf: Rename btf__load() as btf__load_into_kernel()
qmonnet Jul 29, 2021
10d0b3b
libbpf: Rename btf__get_from_id() as btf__load_from_kernel_by_id()
qmonnet Jul 29, 2021
8f2e323
tools: Free BTF objects at various locations
qmonnet Jul 29, 2021
c0915ba
tools: Replace btf__get_from_id() with btf__load_from_kernel_by_id()
qmonnet Jul 29, 2021
54e9c44
libbpf: Add split BTF support for btf__load_from_kernel_by_id()
qmonnet Jul 29, 2021
59406b0
igc: Fix race condition in PTP Tx code
Jul 29, 2020
381d520
igc: Retrieve the TX timestamp directly (instead of in a interrupt)
vcgomes Apr 13, 2021
363fe5d
igc: Add support for multiple in-flight TX timestamps
vcgomes Apr 20, 2021
6e97273
igc: Use irq safe locks for timestamping
vcgomes Apr 24, 2021
1a083b7
tools: Add XDP_FLAGS_USE_METADATA flag
edersondisouza Aug 19, 2021
f58530a
xdp, net: Allow XDP_FLAGS_USE_METADATA to be used for link XDP
edersondisouza Aug 19, 2021
6b318b3
bpf: Export btf_obj_id and bpf_get_btf_vmlinux symbols
edersondisouza Aug 19, 2021
bcdbd55
bpf: Add btf_get_from_module function
edersondisouza Aug 19, 2021
f1f4fff
igc: XDP packet RX timestamp
edersondisouza Aug 19, 2021
3acf07a
igc: XDP packet TX timestamp
edersondisouza Jun 23, 2021
46d8aa0
ethtool,igc: Add "xdp_headroom" driver info
edersondisouza Jun 23, 2021
01a8c28
libbpf: Helpers to access XDP frame metadata
edersondisouza Jun 23, 2021
fe782fa
libbpf: Helpers to access XDP hints based on BTF definitions
edersondisouza Jul 20, 2021
613b86c
samples/bpf: XDP hints AF_XDP example
edersondisouza Jun 23, 2021
dd4f41b
libbpf,xdp,igc: Use union to split XDP TX and RX metadata
edersondisouza Sep 21, 2021
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2 changes: 2 additions & 0 deletions drivers/net/ethernet/intel/ice/ice.h
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Original file line number Diff line number Diff line change
Expand Up @@ -348,6 +348,8 @@ struct ice_vsi {
u16 num_xdp_txq; /* Used XDP queues */
u8 xdp_mapping_mode; /* ICE_MAP_MODE_[CONTIG|SCATTER] */

bool xdp_metadata_support; /* true if VSI should support xdp meta */

/* setup back reference, to which aggregator node this VSI
* corresponds to
*/
Expand Down
8 changes: 6 additions & 2 deletions drivers/net/ethernet/intel/ice/ice_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2377,6 +2377,7 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
xdp_ring->netdev = NULL;
xdp_ring->dev = dev;
xdp_ring->count = vsi->num_tx_desc;
xdp_ring->xdp_metadata_support = vsi->xdp_metadata_support;
WRITE_ONCE(vsi->xdp_rings[i], xdp_ring);
if (ice_setup_tx_ring(xdp_ring))
goto free_xdp_rings;
Expand Down Expand Up @@ -2605,7 +2606,7 @@ static void ice_vsi_rx_napi_schedule(struct ice_vsi *vsi)
*/
static int
ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
struct netlink_ext_ack *extack, u32 flags)
{
int frame_size = vsi->netdev->mtu + ICE_ETH_PKT_HDR_PAD;
bool if_running = netif_running(vsi->netdev);
Expand All @@ -2625,6 +2626,9 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog,
}
}

if (flags & XDP_FLAGS_USE_METADATA)
vsi->xdp_metadata_support = true;

if (!ice_is_xdp_ena_vsi(vsi) && prog) {
vsi->num_xdp_txq = vsi->alloc_rxq;
xdp_ring_err = ice_prepare_xdp_rings(vsi, prog);
Expand Down Expand Up @@ -2678,7 +2682,7 @@ static int ice_xdp(struct net_device *dev, struct netdev_bpf *xdp)

switch (xdp->command) {
case XDP_SETUP_PROG:
return ice_xdp_setup_prog(vsi, xdp->prog, xdp->extack);
return ice_xdp_setup_prog(vsi, xdp->prog, xdp->extack, xdp->flags);
case XDP_SETUP_XSK_POOL:
return ice_xsk_pool_setup(vsi, xdp->xsk.pool,
xdp->xsk.queue_id);
Expand Down
3 changes: 3 additions & 0 deletions drivers/net/ethernet/intel/ice/ice_txrx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1135,6 +1135,9 @@ int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
hard_start = page_address(rx_buf->page) + rx_buf->page_offset -
offset;
xdp_prepare_buff(&xdp, hard_start, offset, size, true);

if (likely(rx_ring->xdp_metadata_support))
ice_xdp_set_meta(&xdp, rx_desc);
#if (PAGE_SIZE > 4096)
/* At larger PAGE_SIZE, frame_sz depend on len size */
xdp.frame_sz = ice_rx_frame_truesize(rx_ring, size);
Expand Down
3 changes: 3 additions & 0 deletions drivers/net/ethernet/intel/ice/ice_txrx.h
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Original file line number Diff line number Diff line change
Expand Up @@ -276,6 +276,7 @@ struct ice_ring {
u16 q_handle; /* Queue handle per TC */

u8 ring_active:1; /* is ring online or not */
u8 xdp_metadata_support:1; /* is xdp metadata support */

u16 count; /* Number of descriptors */
u16 reg_idx; /* HW register index of the ring */
Expand All @@ -301,6 +302,8 @@ struct ice_ring {
/* CL3 - 3rd cacheline starts here */
struct xdp_rxq_info xdp_rxq;
struct sk_buff *skb;


/* CLX - the below items are only accessed infrequently and should be
* in their own cache line if possible
*/
Expand Down
10 changes: 10 additions & 0 deletions drivers/net/ethernet/intel/ice/ice_txrx_lib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,16 @@ static inline void ice_xdp_ring_update_tail(struct ice_ring *xdp_ring)
writel_relaxed(xdp_ring->next_to_use, xdp_ring->tail);
}

static inline void ice_xdp_set_meta(struct xdp_buff *xdp, union ice_32b_rx_flex_desc *desc)
{
struct ice_32b_rx_flex_desc_nic *flex = (struct ice_32b_rx_flex_desc_nic *)desc;
struct xdp_meta_generic *md = xdp->data - sizeof(struct xdp_meta_generic);

xdp->data_meta = md;
md->rxcvid = le16_to_cpu(flex->flex_ts.flex.vlan_id);
md->hash = le32_to_cpu(flex->rss_hash);
}

void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res);
int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_ring *xdp_ring);
int ice_xmit_xdp_ring(void *data, u16 size, struct ice_ring *xdp_ring);
Expand Down
29 changes: 25 additions & 4 deletions drivers/net/ethernet/intel/igc/igc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#include <linux/ptp_clock_kernel.h>
#include <linux/timecounter.h>
#include <linux/net_tstamp.h>
#include <linux/if_xdp.h>

#include "igc_hw.h"

Expand Down Expand Up @@ -65,6 +66,17 @@ struct igc_rx_packet_stats {
u64 other_packets;
};

#define IGC_MAX_TX_TSTAMP_TIMERS 4

struct igc_tx_timestamp_request {
struct sk_buff *skb;
unsigned long start;
u32 mask;
u32 regl;
u32 regh;
u32 flags;
};

struct igc_ring_container {
struct igc_ring *ring; /* pointer to linked list of rings */
unsigned int total_bytes; /* total bytes processed this int */
Expand Down Expand Up @@ -214,10 +226,12 @@ struct igc_adapter {

struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_caps;
struct work_struct ptp_tx_work;
struct sk_buff *ptp_tx_skb;
/* Access to ptp_tx_skb and ptp_tx_start is protected by the
* ptp_tx_lock.
*/
spinlock_t ptp_tx_lock;
struct igc_tx_timestamp_request tx_tstamp[IGC_MAX_TX_TSTAMP_TIMERS];
struct hwtstamp_config tstamp_config;
unsigned long ptp_tx_start;
unsigned int ptp_flags;
/* System time value lock */
spinlock_t tmreg_lock;
Expand All @@ -237,6 +251,9 @@ struct igc_adapter {
struct timespec64 start;
struct timespec64 period;
} perout[IGC_N_PEROUT];

u32 btf_id;
bool btf_enabled;
};

void igc_up(struct igc_adapter *adapter);
Expand Down Expand Up @@ -385,7 +402,6 @@ enum igc_state_t {
__IGC_TESTING,
__IGC_RESETTING,
__IGC_DOWN,
__IGC_PTP_TX_IN_PROGRESS,
};

enum igc_tx_flags {
Expand All @@ -397,6 +413,10 @@ enum igc_tx_flags {
/* olinfo flags */
IGC_TX_FLAGS_IPV4 = 0x10,
IGC_TX_FLAGS_CSUM = 0x20,

IGC_TX_FLAGS_TSTAMP_1 = 0x100,
IGC_TX_FLAGS_TSTAMP_2 = 0x200,
IGC_TX_FLAGS_TSTAMP_3 = 0x400,
};

enum igc_boards {
Expand Down Expand Up @@ -592,6 +612,7 @@ void igc_ptp_reset(struct igc_adapter *adapter);
void igc_ptp_suspend(struct igc_adapter *adapter);
void igc_ptp_stop(struct igc_adapter *adapter);
ktime_t igc_ptp_rx_pktstamp(struct igc_adapter *adapter, __le32 *buf);
void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter, u32 mask);
int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr);
int igc_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr);
void igc_ptp_tx_hang(struct igc_adapter *adapter);
Expand Down
3 changes: 3 additions & 0 deletions drivers/net/ethernet/intel/igc/igc_base.h
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,9 @@ struct igc_adv_tx_context_desc {

/* Adv Transmit Descriptor Config Masks */
#define IGC_ADVTXD_MAC_TSTAMP 0x00080000 /* IEEE1588 Timestamp packet */
#define IGC_ADVTXD_TSTAMP_REG_1 0x00010000 /* IEEE1588 Timestamp packet */
#define IGC_ADVTXD_TSTAMP_REG_2 0x00020000 /* IEEE1588 Timestamp packet */
#define IGC_ADVTXD_TSTAMP_REG_3 0x00030000 /* IEEE1588 Timestamp packet */
#define IGC_ADVTXD_DTYP_CTXT 0x00200000 /* Advanced Context Descriptor */
#define IGC_ADVTXD_DTYP_DATA 0x00300000 /* Advanced Data Descriptor */
#define IGC_ADVTXD_DCMD_EOP 0x01000000 /* End of Packet */
Expand Down
7 changes: 7 additions & 0 deletions drivers/net/ethernet/intel/igc/igc_defines.h
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Original file line number Diff line number Diff line change
Expand Up @@ -404,13 +404,20 @@

/* Time Sync Transmit Control bit definitions */
#define IGC_TSYNCTXCTL_TXTT_0 0x00000001 /* Tx timestamp reg 0 valid */
#define IGC_TSYNCTXCTL_TXTT_1 0x00000002 /* Tx timestamp reg 1 valid */
#define IGC_TSYNCTXCTL_TXTT_2 0x00000004 /* Tx timestamp reg 2 valid */
#define IGC_TSYNCTXCTL_TXTT_3 0x00000008 /* Tx timestamp reg 3 valid */
#define IGC_TSYNCTXCTL_ENABLED 0x00000010 /* enable Tx timestamping */
#define IGC_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK 0x0000F000 /* max delay */
#define IGC_TSYNCTXCTL_SYNC_COMP_ERR 0x20000000 /* sync err */
#define IGC_TSYNCTXCTL_SYNC_COMP 0x40000000 /* sync complete */
#define IGC_TSYNCTXCTL_START_SYNC 0x80000000 /* initiate sync */
#define IGC_TSYNCTXCTL_TXSYNSIG 0x00000020 /* Sample TX tstamp in PHY sop */

#define IGC_TSYNCTXCTL_TXTT_ANY ( \
IGC_TSYNCTXCTL_TXTT_0 | IGC_TSYNCTXCTL_TXTT_1 | \
IGC_TSYNCTXCTL_TXTT_2 | IGC_TSYNCTXCTL_TXTT_3)

/* Timer selection bits */
#define IGC_AUX_IO_TIMER_SEL_SYSTIM0 (0u << 30) /* Select SYSTIM0 for auxiliary time stamp */
#define IGC_AUX_IO_TIMER_SEL_SYSTIM1 (1u << 30) /* Select SYSTIM1 for auxiliary time stamp */
Expand Down
110 changes: 92 additions & 18 deletions drivers/net/ethernet/intel/igc/igc_main.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Intel Corporation */

#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/if_vlan.h>
Expand Down Expand Up @@ -1146,6 +1148,15 @@ static u32 igc_tx_cmd_type(struct sk_buff *skb, u32 tx_flags)
cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSTAMP,
(IGC_ADVTXD_MAC_TSTAMP));

cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSTAMP_1,
(IGC_ADVTXD_TSTAMP_REG_1));

cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSTAMP_2,
(IGC_ADVTXD_TSTAMP_REG_2));

cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSTAMP_3,
(IGC_ADVTXD_TSTAMP_REG_3));

/* insert frame checksum */
cmd_type ^= IGC_SET_FLAG(skb->no_fcs, 1, IGC_ADVTXD_DCMD_IFCS);

Expand Down Expand Up @@ -1403,6 +1414,26 @@ static int igc_tso(struct igc_ring *tx_ring,
return 1;
}

static bool igc_request_tx_tstamp(struct igc_adapter *adapter, struct sk_buff *skb, u32 *flags)
{
int i;

for (i = 0; i < IGC_MAX_TX_TSTAMP_TIMERS; i++) {
struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i];

if (tstamp->skb)
continue;

tstamp->skb = skb_get(skb);
tstamp->start = jiffies;
*flags = tstamp->flags;

return true;
}

return false;
}

static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
struct igc_ring *tx_ring)
{
Expand Down Expand Up @@ -1438,22 +1469,20 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,

if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
struct igc_adapter *adapter = netdev_priv(tx_ring->netdev);
unsigned long flags;
u32 tstamp_flags;

spin_lock_irqsave(&adapter->ptp_tx_lock, flags);

/* FIXME: add support for retrieving timestamps from
* the other timer registers before skipping the
* timestamping request.
*/
if (adapter->tstamp_config.tx_type == HWTSTAMP_TX_ON &&
!test_and_set_bit_lock(__IGC_PTP_TX_IN_PROGRESS,
&adapter->state)) {
igc_request_tx_tstamp(adapter, skb, &tstamp_flags)) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
tx_flags |= IGC_TX_FLAGS_TSTAMP;

adapter->ptp_tx_skb = skb_get(skb);
adapter->ptp_tx_start = jiffies;
tx_flags |= IGC_TX_FLAGS_TSTAMP | tstamp_flags;
} else {
adapter->tx_hwtstamp_skipped++;
}

spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
}

if (skb_vlan_tag_present(skb)) {
Expand Down Expand Up @@ -2284,6 +2313,14 @@ static void igc_finalize_xdp(struct igc_adapter *adapter, int status)
xdp_do_flush();
}

void igc_clean_btf_id(void *addr)
{
struct xdp_meta_generic___igc *hints;

hints = addr - sizeof(*hints);
hints->btf_id = 0;
}

static void igc_update_rx_stats(struct igc_q_vector *q_vector,
unsigned int packets, unsigned int bytes)
{
Expand Down Expand Up @@ -2347,8 +2384,21 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)

if (!skb) {
xdp_init_buff(&xdp, truesize, &rx_ring->xdp_rxq);

xdp_prepare_buff(&xdp, pktbuf - igc_rx_offset(rx_ring),
igc_rx_offset(rx_ring) + pkt_offset, size, false);
igc_rx_offset(rx_ring) + pkt_offset, size,
adapter->btf_enabled);

if (adapter->btf_enabled) {
struct xdp_meta_generic___igc *hints;

hints = xdp.data - sizeof(*hints);
xdp.data_meta = hints;
hints->tstamp = timestamp;
hints->btf_id = adapter->btf_id;
} else {
igc_clean_btf_id(xdp.data);
}

skb = igc_xdp_run_prog(adapter, &xdp);
}
Expand Down Expand Up @@ -2512,12 +2562,19 @@ static int igc_clean_rx_irq_zc(struct igc_q_vector *q_vector, const int budget)
bi->xdp->data);

bi->xdp->data += IGC_TS_HDR_LEN;

/* HW timestamp has been copied into local variable. Metadata
* length when XDP program is called should be 0.
*/
bi->xdp->data_meta += IGC_TS_HDR_LEN;
size -= IGC_TS_HDR_LEN;

if (adapter->btf_enabled) {
struct xdp_meta_generic___igc *hints;

hints = bi->xdp->data - sizeof(*hints);
bi->xdp->data_meta = hints;
hints->tstamp = timestamp;
hints->btf_id = adapter->btf_id;
} else {
igc_clean_btf_id(bi->xdp->data);
}
}

bi->xdp->data_end = bi->xdp->data + size;
Expand Down Expand Up @@ -4179,6 +4236,19 @@ static int igc_init_interrupt_scheme(struct igc_adapter *adapter, bool msix)
return err;
}

static void igc_btf_init(struct igc_adapter *adapter)
{
struct module *owner = THIS_MODULE;
struct btf *btf;

if (owner)
btf = btf_get_from_module(owner);
else
btf = bpf_get_btf_vmlinux();

adapter->btf_id = btf_obj_id(btf);
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Isn't this btf_id of whole definition for module or vmlinux? Maybe something like that to get id of used structure:
adapter->btf_id = btf_find_by_name_kind(btf, "xdp_meta_generic__igc", BTF_KIND_STRUCT);
What do You think?

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I tested here, it doesn't really help. I still need the base (vmlinux) and module btf to parse the btf for the struct. So, i'd need to send two ids instead of one. Following is a snippet of the code I ended up testing with:

    base = btf__parse("/sys/kernel/btf/vmlinux", NULL);
    btf = btf__load_from_kernel_by_id_split(66, base); // "66" is the module btf_id
    t = btf__type_by_id(btf, 133298); // "133298" is the xdp_meta_generic btf_id

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@mswiatko mswiatko Sep 27, 2021 •
edited
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Can You try btf_get_type_id from this commit 36335fe ?

Why do You need btf? I thought type id will be enough in hints case.

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I'll take a look! I needed to also get btf, is because the type is, IIUC, relative to the module. So btf__get_from_id(base) fails.

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@edersondisouza edersondisouza Sep 30, 2021 •
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Err, I mean, btf__type_by_id. I took a look at using btf_get_type_id. It gives me the BTF type ID of the xdp_meta_generic struct. But that alone is not useful on user space - I need the BTF ID for the module as well. Check Andrii's email to Jesper [1].

So it's kinda pointless to include only the BTF type ID. If we include the BTF ID for the module, it's easy to check if any type there has prefix name "xdp_meta_generic". Unless I'm missing a way to get the BTF ID for the module - is there one?

[1]https://www.spinics.net/lists/bpf/msg45746.html

}

/**
* igc_sw_init - Initialize general software structures (struct igc_adapter)
* @adapter: board private structure to initialize
Expand Down Expand Up @@ -4232,6 +4302,8 @@ static int igc_sw_init(struct igc_adapter *adapter)

set_bit(__IGC_DOWN, &adapter->state);

igc_btf_init(adapter);

return 0;
}

Expand Down Expand Up @@ -4682,8 +4754,10 @@ static void igc_tsync_interrupt(struct igc_adapter *adapter)
}

if (tsicr & IGC_TSICR_TXTS) {
/* retrieve hardware timestamp */
schedule_work(&adapter->ptp_tx_work);
u32 tsynctxctl = rd32(IGC_TSYNCTXCTL);;

igc_ptp_tx_hwtstamp(adapter, tsynctxctl & IGC_TSYNCTXCTL_TXTT_ANY);

ack |= IGC_TSICR_TXTS;
}

Expand Down Expand Up @@ -5601,7 +5675,7 @@ static int igc_bpf(struct net_device *dev, struct netdev_bpf *bpf)

switch (bpf->command) {
case XDP_SETUP_PROG:
return igc_xdp_set_prog(adapter, bpf->prog, bpf->extack);
return igc_xdp_set_prog(adapter, bpf->prog, bpf->extack, bpf->flags);
case XDP_SETUP_XSK_POOL:
return igc_xdp_setup_pool(adapter, bpf->xsk.pool,
bpf->xsk.queue_id);
Expand Down
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