* [PATCH net-next 1/2] e1000e: add basic XDP support
2026-03-11 19:14 [PATCH net-next 0/2] e1000e: add XDP support Matteo Croce
@ 2026-03-11 19:14 ` Matteo Croce
2026-03-12 4:21 ` kernel test robot
2026-03-12 4:34 ` kernel test robot
2026-03-11 19:14 ` [PATCH net-next 2/2] e1000e: add XDP_REDIRECT support Matteo Croce
1 sibling, 2 replies; 5+ messages in thread
From: Matteo Croce @ 2026-03-11 19:14 UTC (permalink / raw)
To: Tony Nguyen, Przemek Kitszel, Andrew Lunn, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Alexei Starovoitov,
Daniel Borkmann, Jesper Dangaard Brouer, John Fastabend
Cc: netdev, bpf, linux-kernel
Add XDP support to the e1000e driver covering the actions defined by
NETDEV_XDP_ACT_BASIC: XDP_DROP, XDP_PASS, XDP_TX and XDP_ABORTED.
Infrastructure:
- e1000_xdp_setup() / e1000_xdp() for program attach/detach with
MTU validation and close/open cycle
- ndo_bpf support in net_device_ops
- xdp_rxq_info registration in setup/free_rx_resources
Receive path:
- e1000_alloc_rx_buffers_xdp() for page-based Rx buffer allocation
with XDP_PACKET_HEADROOM
- e1000_clean_rx_irq_xdp() as the XDP receive handler
- e1000_run_xdp() to execute the XDP program on received packets
- SKB building via napi_build_skb() for XDP_PASS with metadata,
checksum offload and RSS hash support
Transmit path:
- e1000_xdp_xmit_ring() to DMA-map and enqueue an XDP frame
- e1000_xdp_xmit_back() to convert an xdp_buff to a frame and send it
- e1000_finalize_xdp() to flush the TX ring after XDP processing
- TX completion via xdp_return_frame() with buffer type tracking
Assisted-by: claude-opus-4-6
Signed-off-by: Matteo Croce <teknoraver@meta.com>
---
drivers/net/ethernet/intel/e1000e/e1000.h | 18 +-
drivers/net/ethernet/intel/e1000e/netdev.c | 523 ++++++++++++++++++++-
2 files changed, 529 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h
index aa08f397988e..7ed0dbadd695 100644
--- a/drivers/net/ethernet/intel/e1000e/e1000.h
+++ b/drivers/net/ethernet/intel/e1000e/e1000.h
@@ -19,10 +19,13 @@
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/ptp_classify.h>
+#include <linux/bpf.h>
#include <linux/mii.h>
#include <linux/mdio.h>
#include <linux/mutex.h>
#include <linux/pm_qos.h>
+#include <net/page_pool/helpers.h>
+#include <net/xdp.h>
#include "hw.h"
struct e1000_info;
@@ -125,12 +128,21 @@ struct e1000_ps_page {
u64 dma; /* must be u64 - written to hw */
};
+enum e1000_tx_buf_type {
+ E1000_TX_BUF_SKB = 0,
+ E1000_TX_BUF_XDP,
+};
+
/* wrappers around a pointer to a socket buffer,
* so a DMA handle can be stored along with the buffer
*/
struct e1000_buffer {
dma_addr_t dma;
- struct sk_buff *skb;
+ union {
+ struct sk_buff *skb;
+ struct xdp_frame *xdpf;
+ };
+ enum e1000_tx_buf_type type;
union {
/* Tx */
struct {
@@ -258,6 +270,10 @@ struct e1000_adapter {
gfp_t gfp);
struct e1000_ring *rx_ring;
+ struct bpf_prog *xdp_prog;
+ struct xdp_rxq_info xdp_rxq;
+ struct page_pool *page_pool;
+
u32 rx_int_delay;
u32 rx_abs_int_delay;
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index ddbe2f7d8112..821b466b6673 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -25,6 +25,10 @@
#include <linux/pm_runtime.h>
#include <linux/prefetch.h>
#include <linux/suspend.h>
+#include <linux/bpf.h>
+#include <linux/bpf_trace.h>
+#include <net/page_pool/helpers.h>
+#include <net/xdp.h>
#include "e1000.h"
#define CREATE_TRACE_POINTS
@@ -33,6 +37,11 @@
char e1000e_driver_name[] = "e1000e";
#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
+
+#define E1000_XDP_PASS 0
+#define E1000_XDP_CONSUMED BIT(0)
+#define E1000_XDP_TX BIT(1)
+
static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
@@ -707,6 +716,369 @@ static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,
rx_ring->next_to_use = i;
}
+static inline void e1000_rx_hash(struct net_device *netdev, __le32 rss,
+ struct sk_buff *skb)
+{
+ if (netdev->features & NETIF_F_RXHASH)
+ skb_set_hash(skb, le32_to_cpu(rss), PKT_HASH_TYPE_L3);
+}
+
+/**
+ * e1000_xdp_xmit_ring - transmit an XDP frame on the TX ring
+ * @adapter: board private structure
+ * @tx_ring: Tx descriptor ring
+ * @xdpf: XDP frame to transmit
+ *
+ * Returns E1000_XDP_TX on success, E1000_XDP_CONSUMED on failure
+ **/
+static int e1000_xdp_xmit_ring(struct e1000_adapter *adapter,
+ struct e1000_ring *tx_ring,
+ struct xdp_frame *xdpf)
+{
+ struct e1000_buffer *buffer_info;
+ struct e1000_tx_desc *tx_desc;
+ dma_addr_t dma;
+ u16 i;
+
+ if (e1000_desc_unused(tx_ring) < 1)
+ return E1000_XDP_CONSUMED;
+
+ i = tx_ring->next_to_use;
+ buffer_info = &tx_ring->buffer_info[i];
+
+ dma = dma_map_single(&adapter->pdev->dev, xdpf->data, xdpf->len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(&adapter->pdev->dev, dma))
+ return E1000_XDP_CONSUMED;
+
+ buffer_info->xdpf = xdpf;
+ buffer_info->type = E1000_TX_BUF_XDP;
+ buffer_info->dma = dma;
+ buffer_info->length = xdpf->len;
+ buffer_info->time_stamp = jiffies;
+ buffer_info->next_to_watch = i;
+ buffer_info->segs = 1;
+ buffer_info->bytecount = xdpf->len;
+ buffer_info->mapped_as_page = 0;
+
+ tx_desc = E1000_TX_DESC(*tx_ring, i);
+ tx_desc->buffer_addr = cpu_to_le64(dma);
+ tx_desc->lower.data = cpu_to_le32(adapter->txd_cmd |
+ E1000_TXD_CMD_IFCS |
+ xdpf->len);
+ tx_desc->upper.data = 0;
+
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+ tx_ring->next_to_use = i;
+
+ return E1000_XDP_TX;
+}
+
+/**
+ * e1000_xdp_xmit_back - transmit an XDP buffer back on the same device
+ * @adapter: board private structure
+ * @xdp: XDP buffer to transmit
+ *
+ * Returns E1000_XDP_TX on success, E1000_XDP_CONSUMED on failure
+ **/
+static int e1000_xdp_xmit_back(struct e1000_adapter *adapter,
+ struct xdp_buff *xdp)
+{
+ struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
+
+ if (unlikely(!xdpf))
+ return E1000_XDP_CONSUMED;
+
+ return e1000_xdp_xmit_ring(adapter, adapter->tx_ring, xdpf);
+}
+
+/**
+ * e1000_finalize_xdp - flush XDP operations after NAPI Rx loop
+ * @adapter: board private structure
+ * @xdp_xmit: bitmask of XDP actions taken during Rx processing
+ **/
+static void e1000_finalize_xdp(struct e1000_adapter *adapter,
+ unsigned int xdp_xmit)
+{
+ struct e1000_ring *tx_ring = adapter->tx_ring;
+
+ if (xdp_xmit & E1000_XDP_TX) {
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch.
+ */
+ wmb();
+ if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
+ e1000e_update_tdt_wa(tx_ring,
+ tx_ring->next_to_use);
+ else
+ writel(tx_ring->next_to_use, tx_ring->tail);
+ }
+}
+
+/**
+ * e1000_run_xdp - run an XDP program on a received packet
+ * @adapter: board private structure
+ * @xdp: XDP buffer containing packet data
+ *
+ * Returns E1000_XDP_PASS, E1000_XDP_TX, or E1000_XDP_CONSUMED
+ **/
+static int e1000_run_xdp(struct e1000_adapter *adapter, struct xdp_buff *xdp)
+{
+ struct bpf_prog *xdp_prog = READ_ONCE(adapter->xdp_prog);
+ struct net_device *netdev = adapter->netdev;
+ int result = E1000_XDP_PASS;
+ u32 act;
+
+ if (!xdp_prog)
+ return E1000_XDP_PASS;
+
+ prefetchw(xdp->data_hard_start);
+
+ act = bpf_prog_run_xdp(xdp_prog, xdp);
+ switch (act) {
+ case XDP_PASS:
+ break;
+ case XDP_TX:
+ result = e1000_xdp_xmit_back(adapter, xdp);
+ if (result == E1000_XDP_CONSUMED)
+ goto out_failure;
+ break;
+ default:
+ bpf_warn_invalid_xdp_action(netdev, xdp_prog, act);
+ fallthrough;
+ case XDP_ABORTED:
+out_failure:
+ trace_xdp_exception(netdev, xdp_prog, act);
+ fallthrough;
+ case XDP_DROP:
+ result = E1000_XDP_CONSUMED;
+ break;
+ }
+
+ return result;
+}
+
+/**
+ * e1000_alloc_rx_buffers_xdp - Replace used receive buffers for XDP
+ * @rx_ring: Rx descriptor ring
+ * @cleaned_count: number to reallocate
+ * @gfp: flags for allocation
+ *
+ * Allocates page-based Rx buffers with XDP_PACKET_HEADROOM headroom.
+ **/
+static void e1000_alloc_rx_buffers_xdp(struct e1000_ring *rx_ring,
+ int cleaned_count, gfp_t gfp)
+{
+ struct e1000_adapter *adapter = rx_ring->adapter;
+ union e1000_rx_desc_extended *rx_desc;
+ struct e1000_buffer *buffer_info;
+ unsigned int i;
+
+ i = rx_ring->next_to_use;
+ buffer_info = &rx_ring->buffer_info[i];
+
+ while (cleaned_count--) {
+ if (!buffer_info->page) {
+ buffer_info->page = page_pool_alloc_pages(adapter->page_pool,
+ gfp);
+ if (!buffer_info->page) {
+ adapter->alloc_rx_buff_failed++;
+ break;
+ }
+ }
+
+ if (!buffer_info->dma) {
+ buffer_info->dma = page_pool_get_dma_addr(buffer_info->page) +
+ XDP_PACKET_HEADROOM;
+ }
+
+ rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
+ rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);
+
+ if (unlikely(!(i & (E1000_RX_BUFFER_WRITE - 1)))) {
+ /* Force memory writes to complete before letting
+ * h/w know there are new descriptors to fetch.
+ */
+ wmb();
+ if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
+ e1000e_update_rdt_wa(rx_ring, i);
+ else
+ writel(i, rx_ring->tail);
+ }
+ i++;
+ if (i == rx_ring->count)
+ i = 0;
+ buffer_info = &rx_ring->buffer_info[i];
+ }
+
+ rx_ring->next_to_use = i;
+}
+
+/**
+ * e1000_clean_rx_irq_xdp - Receive with XDP processing
+ * @rx_ring: Rx descriptor ring
+ * @work_done: output parameter for indicating completed work
+ * @work_to_do: how many packets we can clean
+ *
+ * Page-based receive path that runs an XDP program on each packet.
+ **/
+static bool e1000_clean_rx_irq_xdp(struct e1000_ring *rx_ring, int *work_done,
+ int work_to_do)
+{
+ struct e1000_adapter *adapter = rx_ring->adapter;
+ struct net_device *netdev = adapter->netdev;
+ struct pci_dev *pdev = adapter->pdev;
+ union e1000_rx_desc_extended *rx_desc, *next_rxd;
+ struct e1000_buffer *buffer_info, *next_buffer;
+ struct xdp_buff xdp;
+ u32 length, staterr;
+ unsigned int i;
+ int cleaned_count = 0;
+ bool cleaned = false;
+ unsigned int total_rx_bytes = 0, total_rx_packets = 0;
+ unsigned int xdp_xmit = 0;
+
+ xdp_init_buff(&xdp, PAGE_SIZE, &adapter->xdp_rxq);
+
+ i = rx_ring->next_to_clean;
+ rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
+ staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
+ buffer_info = &rx_ring->buffer_info[i];
+
+ while (staterr & E1000_RXD_STAT_DD) {
+ struct sk_buff *skb;
+ int xdp_res;
+
+ if (*work_done >= work_to_do)
+ break;
+ (*work_done)++;
+ dma_rmb();
+
+ i++;
+ if (i == rx_ring->count)
+ i = 0;
+ next_rxd = E1000_RX_DESC_EXT(*rx_ring, i);
+ prefetch(next_rxd);
+
+ next_buffer = &rx_ring->buffer_info[i];
+
+ cleaned = true;
+ cleaned_count++;
+
+ dma_sync_single_for_cpu(&pdev->dev, buffer_info->dma,
+ adapter->rx_buffer_len,
+ DMA_FROM_DEVICE);
+ buffer_info->dma = 0;
+
+ length = le16_to_cpu(rx_desc->wb.upper.length);
+
+ /* Multi-descriptor packets not supported with XDP */
+ if (unlikely(!(staterr & E1000_RXD_STAT_EOP)))
+ adapter->flags2 |= FLAG2_IS_DISCARDING;
+
+ if (adapter->flags2 & FLAG2_IS_DISCARDING) {
+ if (staterr & E1000_RXD_STAT_EOP)
+ adapter->flags2 &= ~FLAG2_IS_DISCARDING;
+ page_pool_put_full_page(adapter->page_pool,
+ buffer_info->page, true);
+ buffer_info->page = NULL;
+ goto next_desc;
+ }
+
+ if (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&
+ !(netdev->features & NETIF_F_RXALL))) {
+ page_pool_put_full_page(adapter->page_pool,
+ buffer_info->page, true);
+ buffer_info->page = NULL;
+ goto next_desc;
+ }
+
+ /* adjust length to remove Ethernet CRC */
+ if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) {
+ if (netdev->features & NETIF_F_RXFCS)
+ total_rx_bytes -= 4;
+ else
+ length -= 4;
+ }
+
+ /* Setup xdp_buff pointing at the page data */
+ xdp_prepare_buff(&xdp, page_address(buffer_info->page),
+ XDP_PACKET_HEADROOM, length, true);
+ xdp_buff_clear_frags_flag(&xdp);
+
+ xdp_res = e1000_run_xdp(adapter, &xdp);
+
+ if (xdp_res == E1000_XDP_PASS) {
+ total_rx_bytes += length;
+ total_rx_packets++;
+
+ skb = napi_build_skb(xdp.data_hard_start, PAGE_SIZE);
+ if (unlikely(!skb)) {
+ page_pool_put_full_page(adapter->page_pool,
+ buffer_info->page,
+ true);
+ buffer_info->page = NULL;
+ goto next_desc;
+ }
+
+ skb_mark_for_recycle(skb);
+ skb_reserve(skb,
+ xdp.data - xdp.data_hard_start);
+ skb_put(skb, xdp.data_end - xdp.data);
+
+ if (xdp.data_meta != xdp.data)
+ skb_metadata_set(skb, xdp.data - xdp.data_meta);
+
+ e1000_rx_checksum(adapter, staterr, skb);
+ e1000_rx_hash(netdev,
+ rx_desc->wb.lower.hi_dword.rss, skb);
+ e1000_receive_skb(adapter, netdev, skb, staterr,
+ rx_desc->wb.upper.vlan);
+
+ /* page consumed by skb */
+ buffer_info->page = NULL;
+ } else if (xdp_res & E1000_XDP_TX) {
+ xdp_xmit |= xdp_res;
+ total_rx_bytes += length;
+ total_rx_packets++;
+ /* page consumed by XDP TX */
+ buffer_info->page = NULL;
+ } else {
+ /* XDP_DROP / XDP_ABORTED - recycle page */
+ page_pool_put_full_page(adapter->page_pool,
+ buffer_info->page, true);
+ buffer_info->page = NULL;
+ }
+
+next_desc:
+ rx_desc->wb.upper.status_error &= cpu_to_le32(~0xFF);
+
+ if (cleaned_count >= E1000_RX_BUFFER_WRITE) {
+ adapter->alloc_rx_buf(rx_ring, cleaned_count,
+ GFP_ATOMIC);
+ cleaned_count = 0;
+ }
+
+ rx_desc = next_rxd;
+ buffer_info = next_buffer;
+ staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
+ }
+ rx_ring->next_to_clean = i;
+
+ if (xdp_xmit)
+ e1000_finalize_xdp(adapter, xdp_xmit);
+
+ cleaned_count = e1000_desc_unused(rx_ring);
+ if (cleaned_count)
+ adapter->alloc_rx_buf(rx_ring, cleaned_count, GFP_ATOMIC);
+
+ adapter->total_rx_bytes += total_rx_bytes;
+ adapter->total_rx_packets += total_rx_packets;
+ return cleaned;
+}
+
/**
* e1000_alloc_rx_buffers_ps - Replace used receive buffers; packet split
* @rx_ring: Rx descriptor ring
@@ -895,13 +1267,6 @@ static void e1000_alloc_jumbo_rx_buffers(struct e1000_ring *rx_ring,
}
}
-static inline void e1000_rx_hash(struct net_device *netdev, __le32 rss,
- struct sk_buff *skb)
-{
- if (netdev->features & NETIF_F_RXHASH)
- skb_set_hash(skb, le32_to_cpu(rss), PKT_HASH_TYPE_L3);
-}
-
/**
* e1000_clean_rx_irq - Send received data up the network stack
* @rx_ring: Rx descriptor ring
@@ -1074,13 +1439,17 @@ static void e1000_put_txbuf(struct e1000_ring *tx_ring,
buffer_info->length, DMA_TO_DEVICE);
buffer_info->dma = 0;
}
- if (buffer_info->skb) {
+ if (buffer_info->type == E1000_TX_BUF_XDP) {
+ xdp_return_frame(buffer_info->xdpf);
+ buffer_info->xdpf = NULL;
+ } else if (buffer_info->skb) {
if (drop)
dev_kfree_skb_any(buffer_info->skb);
else
dev_consume_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
+ buffer_info->type = E1000_TX_BUF_SKB;
buffer_info->time_stamp = 0;
}
@@ -1241,7 +1610,8 @@ static bool e1000_clean_tx_irq(struct e1000_ring *tx_ring)
if (cleaned) {
total_tx_packets += buffer_info->segs;
total_tx_bytes += buffer_info->bytecount;
- if (buffer_info->skb) {
+ if (buffer_info->type == E1000_TX_BUF_SKB &&
+ buffer_info->skb) {
bytes_compl += buffer_info->skb->len;
pkts_compl++;
}
@@ -1695,7 +2065,12 @@ static void e1000_clean_rx_ring(struct e1000_ring *rx_ring)
}
if (buffer_info->page) {
- put_page(buffer_info->page);
+ if (adapter->page_pool)
+ page_pool_put_full_page(adapter->page_pool,
+ buffer_info->page,
+ false);
+ else
+ put_page(buffer_info->page);
buffer_info->page = NULL;
}
@@ -2351,6 +2726,30 @@ int e1000e_setup_tx_resources(struct e1000_ring *tx_ring)
return err;
}
+static int e1000_create_page_pool(struct e1000_adapter *adapter)
+{
+ struct page_pool_params pp_params = {
+ .flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
+ .pool_size = adapter->rx_ring->count,
+ .nid = NUMA_NO_NODE,
+ .dev = &adapter->pdev->dev,
+ .napi = &adapter->napi,
+ .dma_dir = DMA_FROM_DEVICE,
+ .offset = XDP_PACKET_HEADROOM,
+ .max_len = adapter->rx_buffer_len,
+ };
+
+ adapter->page_pool = page_pool_create(&pp_params);
+ if (IS_ERR(adapter->page_pool)) {
+ int err = PTR_ERR(adapter->page_pool);
+
+ adapter->page_pool = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
/**
* e1000e_setup_rx_resources - allocate Rx resources (Descriptors)
* @rx_ring: Rx descriptor ring
@@ -2391,8 +2790,31 @@ int e1000e_setup_rx_resources(struct e1000_ring *rx_ring)
rx_ring->next_to_use = 0;
rx_ring->rx_skb_top = NULL;
+ /* XDP RX-queue info */
+ if (xdp_rxq_info_is_reg(&adapter->xdp_rxq))
+ xdp_rxq_info_unreg(&adapter->xdp_rxq);
+
+ err = e1000_create_page_pool(adapter);
+ if (err)
+ goto err_pages;
+
+ err = xdp_rxq_info_reg(&adapter->xdp_rxq, adapter->netdev, 0,
+ adapter->napi.napi_id);
+ if (err)
+ goto err_page_pool;
+ err = xdp_rxq_info_reg_mem_model(&adapter->xdp_rxq,
+ MEM_TYPE_PAGE_POOL,
+ adapter->page_pool);
+ if (err) {
+ xdp_rxq_info_unreg(&adapter->xdp_rxq);
+ goto err_page_pool;
+ }
+
return 0;
+err_page_pool:
+ page_pool_destroy(adapter->page_pool);
+ adapter->page_pool = NULL;
err_pages:
for (i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
@@ -2465,6 +2887,14 @@ void e1000e_free_rx_resources(struct e1000_ring *rx_ring)
e1000_clean_rx_ring(rx_ring);
+ if (xdp_rxq_info_is_reg(&adapter->xdp_rxq))
+ xdp_rxq_info_unreg(&adapter->xdp_rxq);
+
+ if (adapter->page_pool) {
+ page_pool_destroy(adapter->page_pool);
+ adapter->page_pool = NULL;
+ }
+
for (i = 0; i < rx_ring->count; i++)
kfree(rx_ring->buffer_info[i].ps_pages);
@@ -3187,7 +3617,11 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
u64 rdba;
u32 rdlen, rctl, rxcsum, ctrl_ext;
- if (adapter->rx_ps_pages) {
+ if (adapter->xdp_prog) {
+ rdlen = rx_ring->count * sizeof(union e1000_rx_desc_extended);
+ adapter->clean_rx = e1000_clean_rx_irq_xdp;
+ adapter->alloc_rx_buf = e1000_alloc_rx_buffers_xdp;
+ } else if (adapter->rx_ps_pages) {
/* this is a 32 byte descriptor */
rdlen = rx_ring->count *
sizeof(union e1000_rx_desc_packet_split);
@@ -6053,6 +6487,12 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
return -EINVAL;
}
+ /* XDP requires standard MTU */
+ if (adapter->xdp_prog && new_mtu > ETH_DATA_LEN) {
+ e_err("Jumbo Frames not supported while XDP program is active.\n");
+ return -EINVAL;
+ }
+
/* Jumbo frame workaround on 82579 and newer requires CRC be stripped */
if ((adapter->hw.mac.type >= e1000_pch2lan) &&
!(adapter->flags2 & FLAG2_CRC_STRIPPING) &&
@@ -7335,6 +7775,62 @@ static int e1000_set_features(struct net_device *netdev,
return 1;
}
+/**
+ * e1000_xdp_setup - add/remove an XDP program
+ * @netdev: network interface device structure
+ * @bpf: XDP program setup structure
+ **/
+static int e1000_xdp_setup(struct net_device *netdev, struct netdev_bpf *bpf)
+{
+ struct e1000_adapter *adapter = netdev_priv(netdev);
+ struct bpf_prog *prog = bpf->prog, *old_prog;
+ bool running = netif_running(netdev);
+ bool need_reset;
+
+ /* XDP is incompatible with jumbo frames */
+ if (prog && netdev->mtu > ETH_DATA_LEN) {
+ NL_SET_ERR_MSG_MOD(bpf->extack,
+ "XDP is not supported with jumbo frames");
+ return -EINVAL;
+ }
+
+ /* Validate frame fits in a single page with XDP headroom */
+ if (prog && netdev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN +
+ XDP_PACKET_HEADROOM > PAGE_SIZE) {
+ NL_SET_ERR_MSG_MOD(bpf->extack,
+ "Frame size too large for XDP");
+ return -EINVAL;
+ }
+
+ old_prog = xchg(&adapter->xdp_prog, prog);
+ need_reset = (!!prog != !!old_prog);
+
+ /* Transition between XDP and non-XDP requires ring reconfiguration */
+ if (need_reset && running)
+ e1000e_close(netdev);
+
+ if (old_prog)
+ bpf_prog_put(old_prog);
+
+ if (!need_reset)
+ return 0;
+
+ if (running)
+ e1000e_open(netdev);
+
+ return 0;
+}
+
+static int e1000_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
+{
+ switch (xdp->command) {
+ case XDP_SETUP_PROG:
+ return e1000_xdp_setup(netdev, xdp);
+ default:
+ return -EINVAL;
+ }
+}
+
static const struct net_device_ops e1000e_netdev_ops = {
.ndo_open = e1000e_open,
.ndo_stop = e1000e_close,
@@ -7357,6 +7853,7 @@ static const struct net_device_ops e1000e_netdev_ops = {
.ndo_features_check = passthru_features_check,
.ndo_hwtstamp_get = e1000e_hwtstamp_get,
.ndo_hwtstamp_set = e1000e_hwtstamp_set,
+ .ndo_bpf = e1000_xdp,
};
/**
@@ -7567,6 +8064,8 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev->max_mtu = adapter->max_hw_frame_size -
(VLAN_ETH_HLEN + ETH_FCS_LEN);
+ netdev->xdp_features = NETDEV_XDP_ACT_BASIC;
+
if (e1000e_enable_mng_pass_thru(&adapter->hw))
adapter->flags |= FLAG_MNG_PT_ENABLED;
@@ -7780,6 +8279,8 @@ static void e1000_remove(struct pci_dev *pdev)
e1000e_release_hw_control(adapter);
e1000e_reset_interrupt_capability(adapter);
+ if (adapter->xdp_prog)
+ bpf_prog_put(adapter->xdp_prog);
kfree(adapter->tx_ring);
kfree(adapter->rx_ring);
--
2.53.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH net-next 2/2] e1000e: add XDP_REDIRECT support
2026-03-11 19:14 [PATCH net-next 0/2] e1000e: add XDP support Matteo Croce
2026-03-11 19:14 ` [PATCH net-next 1/2] e1000e: add basic " Matteo Croce
@ 2026-03-11 19:14 ` Matteo Croce
1 sibling, 0 replies; 5+ messages in thread
From: Matteo Croce @ 2026-03-11 19:14 UTC (permalink / raw)
To: Tony Nguyen, Przemek Kitszel, Andrew Lunn, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Alexei Starovoitov,
Daniel Borkmann, Jesper Dangaard Brouer, John Fastabend
Cc: netdev, bpf, linux-kernel
Add the ability to redirect packets to other devices via XDP_REDIRECT
and to receive redirected frames from other devices via ndo_xdp_xmit.
New functionality:
- XDP_REDIRECT case in e1000_run_xdp() using xdp_do_redirect()
- e1000_xdp_xmit() as the ndo_xdp_xmit callback for receiving
redirected frames from other devices
- xdp_do_flush() in e1000_finalize_xdp() for REDIR completions
- xdp_features_set/clear_redirect_target() in e1000_xdp_setup()
- NETDEV_XDP_ACT_REDIRECT and NETDEV_XDP_ACT_NDO_XMIT advertised
Assisted-by: claude-opus-4-6
Signed-off-by: Matteo Croce <teknoraver@meta.com>
---
drivers/net/ethernet/intel/e1000e/netdev.c | 85 +++++++++++++++++++++-
1 file changed, 81 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 821b466b6673..1e28eaed7ae3 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -41,6 +41,7 @@ char e1000e_driver_name[] = "e1000e";
#define E1000_XDP_PASS 0
#define E1000_XDP_CONSUMED BIT(0)
#define E1000_XDP_TX BIT(1)
+#define E1000_XDP_REDIR BIT(2)
static int debug = -1;
module_param(debug, int, 0);
@@ -804,6 +805,9 @@ static void e1000_finalize_xdp(struct e1000_adapter *adapter,
{
struct e1000_ring *tx_ring = adapter->tx_ring;
+ if (xdp_xmit & E1000_XDP_REDIR)
+ xdp_do_flush();
+
if (xdp_xmit & E1000_XDP_TX) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch.
@@ -822,13 +826,14 @@ static void e1000_finalize_xdp(struct e1000_adapter *adapter,
* @adapter: board private structure
* @xdp: XDP buffer containing packet data
*
- * Returns E1000_XDP_PASS, E1000_XDP_TX, or E1000_XDP_CONSUMED
+ * Returns E1000_XDP_PASS, E1000_XDP_TX, E1000_XDP_REDIR, or E1000_XDP_CONSUMED
**/
static int e1000_run_xdp(struct e1000_adapter *adapter, struct xdp_buff *xdp)
{
struct bpf_prog *xdp_prog = READ_ONCE(adapter->xdp_prog);
struct net_device *netdev = adapter->netdev;
int result = E1000_XDP_PASS;
+ int err;
u32 act;
if (!xdp_prog)
@@ -845,6 +850,12 @@ static int e1000_run_xdp(struct e1000_adapter *adapter, struct xdp_buff *xdp)
if (result == E1000_XDP_CONSUMED)
goto out_failure;
break;
+ case XDP_REDIRECT:
+ err = xdp_do_redirect(netdev, xdp, xdp_prog);
+ if (err)
+ goto out_failure;
+ result = E1000_XDP_REDIR;
+ break;
default:
bpf_warn_invalid_xdp_action(netdev, xdp_prog, act);
fallthrough;
@@ -1039,11 +1050,11 @@ static bool e1000_clean_rx_irq_xdp(struct e1000_ring *rx_ring, int *work_done,
/* page consumed by skb */
buffer_info->page = NULL;
- } else if (xdp_res & E1000_XDP_TX) {
+ } else if (xdp_res & (E1000_XDP_TX | E1000_XDP_REDIR)) {
xdp_xmit |= xdp_res;
total_rx_bytes += length;
total_rx_packets++;
- /* page consumed by XDP TX */
+ /* page consumed by XDP TX/redirect */
buffer_info->page = NULL;
} else {
/* XDP_DROP / XDP_ABORTED - recycle page */
@@ -7815,6 +7826,11 @@ static int e1000_xdp_setup(struct net_device *netdev, struct netdev_bpf *bpf)
if (!need_reset)
return 0;
+ if (prog)
+ xdp_features_set_redirect_target(netdev, true);
+ else
+ xdp_features_clear_redirect_target(netdev);
+
if (running)
e1000e_open(netdev);
@@ -7831,6 +7847,64 @@ static int e1000_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
}
}
+/**
+ * e1000_xdp_xmit - transmit XDP frames from another device
+ * @netdev: network interface device structure
+ * @n: number of frames to transmit
+ * @frames: array of XDP frame pointers
+ * @flags: XDP transmit flags
+ *
+ * This is the ndo_xdp_xmit callback, called when other devices redirect
+ * frames to this device.
+ **/
+static int e1000_xdp_xmit(struct net_device *netdev, int n,
+ struct xdp_frame **frames, u32 flags)
+{
+ struct e1000_adapter *adapter = netdev_priv(netdev);
+ struct e1000_ring *tx_ring = adapter->tx_ring;
+ struct netdev_queue *nq = netdev_get_tx_queue(netdev, 0);
+ int cpu = smp_processor_id();
+ int nxmit = 0;
+ int i;
+
+ if (unlikely(test_bit(__E1000_DOWN, &adapter->state)))
+ return -ENETDOWN;
+
+ if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
+ return -EINVAL;
+
+ if (!adapter->xdp_prog)
+ return -ENXIO;
+
+ __netif_tx_lock(nq, cpu);
+ txq_trans_cond_update(nq);
+
+ for (i = 0; i < n; i++) {
+ int err;
+
+ err = e1000_xdp_xmit_ring(adapter, tx_ring, frames[i]);
+ if (err != E1000_XDP_TX)
+ break;
+ nxmit++;
+ }
+
+ if (unlikely(flags & XDP_XMIT_FLUSH)) {
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch.
+ */
+ wmb();
+ if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
+ e1000e_update_tdt_wa(tx_ring,
+ tx_ring->next_to_use);
+ else
+ writel(tx_ring->next_to_use, tx_ring->tail);
+ }
+
+ __netif_tx_unlock(nq);
+
+ return nxmit;
+}
+
static const struct net_device_ops e1000e_netdev_ops = {
.ndo_open = e1000e_open,
.ndo_stop = e1000e_close,
@@ -7854,6 +7928,7 @@ static const struct net_device_ops e1000e_netdev_ops = {
.ndo_hwtstamp_get = e1000e_hwtstamp_get,
.ndo_hwtstamp_set = e1000e_hwtstamp_set,
.ndo_bpf = e1000_xdp,
+ .ndo_xdp_xmit = e1000_xdp_xmit,
};
/**
@@ -8064,7 +8139,9 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev->max_mtu = adapter->max_hw_frame_size -
(VLAN_ETH_HLEN + ETH_FCS_LEN);
- netdev->xdp_features = NETDEV_XDP_ACT_BASIC;
+ netdev->xdp_features = NETDEV_XDP_ACT_BASIC |
+ NETDEV_XDP_ACT_REDIRECT |
+ NETDEV_XDP_ACT_NDO_XMIT;
if (e1000e_enable_mng_pass_thru(&adapter->hw))
adapter->flags |= FLAG_MNG_PT_ENABLED;
--
2.53.0
^ permalink raw reply related [flat|nested] 5+ messages in thread