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Merge branch 'bnxt-xdp-multi-buffer' 

Michael Chan says:

====================
bnxt: Support XDP multi buffer

This series adds XDP multi buffer support, allowing MTU to go beyond
the page size limit.

v4: Rebase with latest net-next
v3: Simplify page mode buffer size calculation
    Check to make sure XDP program supports multipage packets
v2: Fix uninitialized variable warnings in patch 1 and 10.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2022-04-08 11:52:48 +01:00
parent d1f66ac69f 9f4b28301c
commit 6e8805de30
5 changed files with 416 additions and 113 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

222
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -56,6 +56,7 @@
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <net/page_pool.h>
#include <linux/align.h>
#include "bnxt_hsi.h"
#include "bnxt.h"
@ -738,7 +739,6 @@ static struct page *__bnxt_alloc_rx_page(struct bnxt *bp, dma_addr_t *mapping,
page_pool_recycle_direct(rxr->page_pool, page);
return NULL;
}
*mapping += bp->rx_dma_offset;
return page;
}
@ -780,6 +780,7 @@ int bnxt_alloc_rx_data(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
if (!page)
return -ENOMEM;
mapping += bp->rx_dma_offset;
rx_buf->data = page;
rx_buf->data_ptr = page_address(page) + bp->rx_offset;
} else {
@ -840,6 +841,13 @@ static inline int bnxt_alloc_rx_page(struct bnxt *bp,
u16 sw_prod = rxr->rx_sw_agg_prod;
unsigned int offset = 0;
if (BNXT_RX_PAGE_MODE(bp)) {
page = __bnxt_alloc_rx_page(bp, &mapping, rxr, gfp);
if (!page)
return -ENOMEM;
} else {
if (PAGE_SIZE > BNXT_RX_PAGE_SIZE) {
page = rxr->rx_page;
if (!page) {
@ -868,6 +876,7 @@ static inline int bnxt_alloc_rx_page(struct bnxt *bp,
__free_page(page);
return -EIO;
}
}
if (unlikely(test_bit(sw_prod, rxr->rx_agg_bmap)))
sw_prod = bnxt_find_next_agg_idx(rxr, sw_prod);
@ -962,6 +971,39 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
rxr->rx_sw_agg_prod = sw_prod;
}
static struct sk_buff *bnxt_rx_multi_page_skb(struct bnxt *bp,
struct bnxt_rx_ring_info *rxr,
u16 cons, void *data, u8 *data_ptr,
dma_addr_t dma_addr,
unsigned int offset_and_len)
{
unsigned int len = offset_and_len & 0xffff;
struct page *page = data;
u16 prod = rxr->rx_prod;
struct sk_buff *skb;
int err;
err = bnxt_alloc_rx_data(bp, rxr, prod, GFP_ATOMIC);
if (unlikely(err)) {
bnxt_reuse_rx_data(rxr, cons, data);
return NULL;
}
dma_addr -= bp->rx_dma_offset;
dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
skb = build_skb(page_address(page), BNXT_PAGE_MODE_BUF_SIZE +
bp->rx_dma_offset);
if (!skb) {
__free_page(page);
return NULL;
}
skb_mark_for_recycle(skb);
skb_reserve(skb, bp->rx_dma_offset);
__skb_put(skb, len);
return skb;
}
static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
struct bnxt_rx_ring_info *rxr,
u16 cons, void *data, u8 *data_ptr,
@ -984,7 +1026,6 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
dma_addr -= bp->rx_dma_offset;
dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
page_pool_release_page(rxr->page_pool, page);
if (unlikely(!payload))
payload = eth_get_headlen(bp->dev, data_ptr, len);
@ -995,6 +1036,7 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
return NULL;
}
skb_mark_for_recycle(skb);
off = (void *)data_ptr - page_address(page);
skb_add_rx_frag(skb, 0, page, off, len, PAGE_SIZE);
memcpy(skb->data - NET_IP_ALIGN, data_ptr - NET_IP_ALIGN,
@ -1038,22 +1080,24 @@ static struct sk_buff *bnxt_rx_skb(struct bnxt *bp,
return skb;
}
static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
static u32 __bnxt_rx_agg_pages(struct bnxt *bp,
struct bnxt_cp_ring_info *cpr,
struct sk_buff *skb, u16 idx,
u32 agg_bufs, bool tpa)
struct skb_shared_info *shinfo,
u16 idx, u32 agg_bufs, bool tpa,
struct xdp_buff *xdp)
{
struct bnxt_napi *bnapi = cpr->bnapi;
struct pci_dev *pdev = bp->pdev;
struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
u16 prod = rxr->rx_agg_prod;
u32 i, total_frag_len = 0;
bool p5_tpa = false;
u32 i;
if ((bp->flags & BNXT_FLAG_CHIP_P5) && tpa)
p5_tpa = true;
for (i = 0; i < agg_bufs; i++) {
skb_frag_t *frag = &shinfo->frags[i];
u16 cons, frag_len;
struct rx_agg_cmp *agg;
struct bnxt_sw_rx_agg_bd *cons_rx_buf;
@ -1069,8 +1113,10 @@ static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
RX_AGG_CMP_LEN) >> RX_AGG_CMP_LEN_SHIFT;
cons_rx_buf = &rxr->rx_agg_ring[cons];
skb_fill_page_desc(skb, i, cons_rx_buf->page,
cons_rx_buf->offset, frag_len);
skb_frag_off_set(frag, cons_rx_buf->offset);
skb_frag_size_set(frag, frag_len);
__skb_frag_set_page(frag, cons_rx_buf->page);
shinfo->nr_frags = i + 1;
__clear_bit(cons, rxr->rx_agg_bmap);
/* It is possible for bnxt_alloc_rx_page() to allocate
@ -1081,16 +1127,14 @@ static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
page = cons_rx_buf->page;
cons_rx_buf->page = NULL;
if (xdp && page_is_pfmemalloc(page))
xdp_buff_set_frag_pfmemalloc(xdp);
if (bnxt_alloc_rx_page(bp, rxr, prod, GFP_ATOMIC) != 0) {
struct skb_shared_info *shinfo;
unsigned int nr_frags;
shinfo = skb_shinfo(skb);
nr_frags = --shinfo->nr_frags;
__skb_frag_set_page(&shinfo->frags[nr_frags], NULL);
dev_kfree_skb(skb);
cons_rx_buf->page = page;
/* Update prod since possibly some pages have been
@ -1098,23 +1142,62 @@ static struct sk_buff *bnxt_rx_pages(struct bnxt *bp,
*/
rxr->rx_agg_prod = prod;
bnxt_reuse_rx_agg_bufs(cpr, idx, i, agg_bufs - i, tpa);
return NULL;
return 0;
}
dma_unmap_page_attrs(&pdev->dev, mapping, BNXT_RX_PAGE_SIZE,
DMA_FROM_DEVICE,
bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
skb->data_len += frag_len;
skb->len += frag_len;
skb->truesize += PAGE_SIZE;
total_frag_len += frag_len;
prod = NEXT_RX_AGG(prod);
}
rxr->rx_agg_prod = prod;
return total_frag_len;
}
static struct sk_buff *bnxt_rx_agg_pages_skb(struct bnxt *bp,
struct bnxt_cp_ring_info *cpr,
struct sk_buff *skb, u16 idx,
u32 agg_bufs, bool tpa)
{
struct skb_shared_info *shinfo = skb_shinfo(skb);
u32 total_frag_len = 0;
total_frag_len = __bnxt_rx_agg_pages(bp, cpr, shinfo, idx,
agg_bufs, tpa, NULL);
if (!total_frag_len) {
dev_kfree_skb(skb);
return NULL;
}
skb->data_len += total_frag_len;
skb->len += total_frag_len;
skb->truesize += PAGE_SIZE * agg_bufs;
return skb;
}
static u32 bnxt_rx_agg_pages_xdp(struct bnxt *bp,
struct bnxt_cp_ring_info *cpr,
struct xdp_buff *xdp, u16 idx,
u32 agg_bufs, bool tpa)
{
struct skb_shared_info *shinfo = xdp_get_shared_info_from_buff(xdp);
u32 total_frag_len = 0;
if (!xdp_buff_has_frags(xdp))
shinfo->nr_frags = 0;
total_frag_len = __bnxt_rx_agg_pages(bp, cpr, shinfo,
idx, agg_bufs, tpa, xdp);
if (total_frag_len) {
xdp_buff_set_frags_flag(xdp);
shinfo->nr_frags = agg_bufs;
shinfo->xdp_frags_size = total_frag_len;
}
return total_frag_len;
}
static int bnxt_agg_bufs_valid(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
u8 agg_bufs, u32 *raw_cons)
{
@ -1644,7 +1727,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
}
if (agg_bufs) {
skb = bnxt_rx_pages(bp, cpr, skb, idx, agg_bufs, true);
skb = bnxt_rx_agg_pages_skb(bp, cpr, skb, idx, agg_bufs, true);
if (!skb) {
/* Page reuse already handled by bnxt_rx_pages(). */
cpr->sw_stats.rx.rx_oom_discards += 1;
@ -1729,8 +1812,10 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
struct bnxt_sw_rx_bd *rx_buf;
unsigned int len;
u8 *data_ptr, agg_bufs, cmp_type;
bool xdp_active = false;
dma_addr_t dma_addr;
struct sk_buff *skb;
struct xdp_buff xdp;
u32 flags, misc;
void *data;
int rc = 0;
@ -1839,18 +1924,39 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
len = flags >> RX_CMP_LEN_SHIFT;
dma_addr = rx_buf->mapping;
if (bnxt_rx_xdp(bp, rxr, cons, data, &data_ptr, &len, event)) {
if (bnxt_xdp_attached(bp, rxr)) {
bnxt_xdp_buff_init(bp, rxr, cons, &data_ptr, &len, &xdp);
if (agg_bufs) {
u32 frag_len = bnxt_rx_agg_pages_xdp(bp, cpr, &xdp,
cp_cons, agg_bufs,
false);
if (!frag_len) {
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
}
}
xdp_active = true;
}
if (xdp_active) {
if (bnxt_rx_xdp(bp, rxr, cons, xdp, data, &len, event)) {
rc = 1;
goto next_rx;
}
}
if (len <= bp->rx_copy_thresh) {
skb = bnxt_copy_skb(bnapi, data_ptr, len, dma_addr);
bnxt_reuse_rx_data(rxr, cons, data);
if (!skb) {
if (agg_bufs)
if (agg_bufs) {
if (!xdp_active)
bnxt_reuse_rx_agg_bufs(cpr, cp_cons, 0,
agg_bufs, false);
else
bnxt_xdp_buff_frags_free(rxr, &xdp);
}
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
@ -1872,12 +1978,23 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
}
if (agg_bufs) {
skb = bnxt_rx_pages(bp, cpr, skb, cp_cons, agg_bufs, false);
if (!xdp_active) {
skb = bnxt_rx_agg_pages_skb(bp, cpr, skb, cp_cons, agg_bufs, false);
if (!skb) {
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
}
} else {
skb = bnxt_xdp_build_skb(bp, skb, agg_bufs, rxr->page_pool, &xdp, rxcmp1);
if (!skb) {
/* we should be able to free the old skb here */
bnxt_xdp_buff_frags_free(rxr, &xdp);
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
}
}
}
if (RX_CMP_HASH_VALID(rxcmp)) {
@ -2492,10 +2609,13 @@ static void __bnxt_poll_work_done(struct bnxt *bp, struct bnxt_napi *bnapi)
if ((bnapi->events & BNXT_RX_EVENT) && !(bnapi->in_reset)) {
struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
if (bnapi->events & BNXT_AGG_EVENT)
bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
bnxt_db_write(bp, &rxr->rx_db, rxr->rx_prod);
}
if (bnapi->events & BNXT_AGG_EVENT) {
struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
}
bnapi->events = 0;
}
@ -2872,15 +2992,24 @@ skip_rx_buf_free:
if (!page)
continue;
if (BNXT_RX_PAGE_MODE(bp)) {
dma_unmap_page_attrs(&pdev->dev, rx_agg_buf->mapping,
BNXT_RX_PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
rx_agg_buf->page = NULL;
__clear_bit(i, rxr->rx_agg_bmap);
page_pool_recycle_direct(rxr->page_pool, page);
} else {
dma_unmap_page_attrs(&pdev->dev, rx_agg_buf->mapping,
BNXT_RX_PAGE_SIZE, DMA_FROM_DEVICE,
DMA_ATTR_WEAK_ORDERING);
rx_agg_buf->page = NULL;
__clear_bit(i, rxr->rx_agg_bmap);
__free_page(page);
}
}
skip_rx_agg_free:
if (rxr->rx_page) {
@ -3793,7 +3922,7 @@ void bnxt_set_ring_params(struct bnxt *bp)
/* 8 for CRC and VLAN */
rx_size = SKB_DATA_ALIGN(bp->dev->mtu + ETH_HLEN + NET_IP_ALIGN + 8);
rx_space = rx_size + NET_SKB_PAD +
rx_space = rx_size + ALIGN(max(NET_SKB_PAD, XDP_PACKET_HEADROOM), 8) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
bp->rx_copy_thresh = BNXT_RX_COPY_THRESH;
@ -3834,10 +3963,16 @@ void bnxt_set_ring_params(struct bnxt *bp)
}
bp->rx_agg_ring_size = agg_ring_size;
bp->rx_agg_ring_mask = (bp->rx_agg_nr_pages * RX_DESC_CNT) - 1;
if (BNXT_RX_PAGE_MODE(bp)) {
rx_space = BNXT_PAGE_MODE_BUF_SIZE;
rx_size = BNXT_MAX_PAGE_MODE_MTU;
} else {
rx_size = SKB_DATA_ALIGN(BNXT_RX_COPY_THRESH + NET_IP_ALIGN);
rx_space = rx_size + NET_SKB_PAD +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
}
bp->rx_buf_use_size = rx_size;
bp->rx_buf_size = rx_space;
@ -3877,14 +4012,21 @@ void bnxt_set_ring_params(struct bnxt *bp)
int bnxt_set_rx_skb_mode(struct bnxt *bp, bool page_mode)
{
if (page_mode) {
if (bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU)
return -EOPNOTSUPP;
bp->flags &= ~BNXT_FLAG_AGG_RINGS;
bp->flags |= BNXT_FLAG_RX_PAGE_MODE;
if (bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
bp->flags |= BNXT_FLAG_JUMBO;
bp->rx_skb_func = bnxt_rx_multi_page_skb;
bp->dev->max_mtu =
min_t(u16, bp->max_mtu, BNXT_MAX_MTU);
} else {
bp->flags |= BNXT_FLAG_NO_AGG_RINGS;
bp->rx_skb_func = bnxt_rx_page_skb;
bp->dev->max_mtu =
min_t(u16, bp->max_mtu, BNXT_MAX_PAGE_MODE_MTU);
bp->flags &= ~BNXT_FLAG_AGG_RINGS;
bp->flags |= BNXT_FLAG_NO_AGG_RINGS | BNXT_FLAG_RX_PAGE_MODE;
}
bp->rx_dir = DMA_BIDIRECTIONAL;
bp->rx_skb_func = bnxt_rx_page_skb;
/* Disable LRO or GRO_HW */
netdev_update_features(bp->dev);
} else {
@ -5226,12 +5368,15 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, u16 vnic_id)
if (rc)
return rc;
req->flags = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_JUMBO_PLACEMENT |
VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV4 |
req->flags = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_JUMBO_PLACEMENT);
req->enables = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_JUMBO_THRESH_VALID);
if (BNXT_RX_PAGE_MODE(bp) && !BNXT_RX_JUMBO_MODE(bp)) {
req->flags |= cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV4 |
VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV6);
req->enables =
cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_JUMBO_THRESH_VALID |
VNIC_PLCMODES_CFG_REQ_ENABLES_HDS_THRESHOLD_VALID);
req->enables |=
cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_HDS_THRESHOLD_VALID);
}
/* thresholds not implemented in firmware yet */
req->jumbo_thresh = cpu_to_le16(bp->rx_copy_thresh);
req->hds_threshold = cpu_to_le16(bp->rx_copy_thresh);
@ -11031,6 +11176,9 @@ static netdev_features_t bnxt_fix_features(struct net_device *dev,
if (bp->flags & BNXT_FLAG_NO_AGG_RINGS)
features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
if (!(bp->flags & BNXT_FLAG_TPA))
features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
if (!(features & NETIF_F_GRO))
features &= ~NETIF_F_GRO_HW;

12
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -591,10 +591,12 @@ struct nqe_cn {
#define BNXT_RX_PAGE_SIZE (1 << BNXT_RX_PAGE_SHIFT)
#define BNXT_MAX_MTU 9500
#define BNXT_MAX_PAGE_MODE_MTU \
#define BNXT_PAGE_MODE_BUF_SIZE \
((unsigned int)PAGE_SIZE - VLAN_ETH_HLEN - NET_IP_ALIGN - \
XDP_PACKET_HEADROOM - \
SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info)))
XDP_PACKET_HEADROOM)
#define BNXT_MAX_PAGE_MODE_MTU \
BNXT_PAGE_MODE_BUF_SIZE - \
SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info))
#define BNXT_MIN_PKT_SIZE 52
@ -699,13 +701,12 @@ struct bnxt_sw_tx_bd {
};
DEFINE_DMA_UNMAP_ADDR(mapping);
DEFINE_DMA_UNMAP_LEN(len);
struct page *page;
u8 is_gso;
u8 is_push;
u8 action;
union {
unsigned short nr_frags;
u16 rx_prod;
};
};
struct bnxt_sw_rx_bd {
@ -1817,6 +1818,7 @@ struct bnxt {
#define BNXT_SUPPORTS_TPA(bp) (!BNXT_CHIP_TYPE_NITRO_A0(bp) && \
(!((bp)->flags & BNXT_FLAG_CHIP_P5) || \
(bp)->max_tpa_v2) && !is_kdump_kernel())
#define BNXT_RX_JUMBO_MODE(bp) ((bp)->flags & BNXT_FLAG_JUMBO)
#define BNXT_CHIP_SR2(bp) \
((bp)->chip_num == CHIP_NUM_58818)

2
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
View File

@ -3491,7 +3491,7 @@ static int bnxt_run_loopback(struct bnxt *bp)
dev_kfree_skb(skb);
return -EIO;
}
bnxt_xmit_bd(bp, txr, map, pkt_size);
bnxt_xmit_bd(bp, txr, map, pkt_size, NULL);
/* Sync BD data before updating doorbell */
wmb();

191
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
View File

@ -24,36 +24,91 @@ DEFINE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
struct bnxt_tx_ring_info *txr,
dma_addr_t mapping, u32 len)
dma_addr_t mapping, u32 len,
struct xdp_buff *xdp)
{
struct bnxt_sw_tx_bd *tx_buf;
struct skb_shared_info *sinfo;
struct bnxt_sw_tx_bd *tx_buf, *first_buf;
struct tx_bd *txbd;
int num_frags = 0;
u32 flags;
u16 prod;
int i;
if (xdp && xdp_buff_has_frags(xdp)) {
sinfo = xdp_get_shared_info_from_buff(xdp);
num_frags = sinfo->nr_frags;
}
/* fill up the first buffer */
prod = txr->tx_prod;
tx_buf = &txr->tx_buf_ring[prod];
first_buf = tx_buf;
tx_buf->nr_frags = num_frags;
if (xdp)
tx_buf->page = virt_to_head_page(xdp->data);
txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
flags = (len << TX_BD_LEN_SHIFT) | (1 << TX_BD_FLAGS_BD_CNT_SHIFT) |
TX_BD_FLAGS_PACKET_END | bnxt_lhint_arr[len >> 9];
flags = ((len) << TX_BD_LEN_SHIFT) | ((num_frags + 1) << TX_BD_FLAGS_BD_CNT_SHIFT);
txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
txbd->tx_bd_opaque = prod;
txbd->tx_bd_haddr = cpu_to_le64(mapping);
/* now let us fill up the frags into the next buffers */
for (i = 0; i < num_frags ; i++) {
skb_frag_t *frag = &sinfo->frags[i];
struct bnxt_sw_tx_bd *frag_tx_buf;
struct pci_dev *pdev = bp->pdev;
dma_addr_t frag_mapping;
int frag_len;
prod = NEXT_TX(prod);
txr->tx_prod = prod;
return tx_buf;
/* first fill up the first buffer */
frag_tx_buf = &txr->tx_buf_ring[prod];
frag_tx_buf->page = skb_frag_page(frag);
txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
frag_len = skb_frag_size(frag);
frag_mapping = skb_frag_dma_map(&pdev->dev, frag, 0,
frag_len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(&pdev->dev, frag_mapping)))
return NULL;
dma_unmap_addr_set(frag_tx_buf, mapping, frag_mapping);
flags = frag_len << TX_BD_LEN_SHIFT;
txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
txbd->tx_bd_opaque = prod;
txbd->tx_bd_haddr = cpu_to_le64(frag_mapping);
len = frag_len;
}
flags &= ~TX_BD_LEN;
txbd->tx_bd_len_flags_type = cpu_to_le32(((len) << TX_BD_LEN_SHIFT) | flags |
TX_BD_FLAGS_PACKET_END);
/* Sync TX BD */
wmb();
prod = NEXT_TX(prod);
txr->tx_prod = prod;
return first_buf;
}
static void __bnxt_xmit_xdp(struct bnxt *bp, struct bnxt_tx_ring_info *txr,
dma_addr_t mapping, u32 len, u16 rx_prod)
dma_addr_t mapping, u32 len, u16 rx_prod,
struct xdp_buff *xdp)
{
struct bnxt_sw_tx_bd *tx_buf;
tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
tx_buf = bnxt_xmit_bd(bp, txr, mapping, len, xdp);
tx_buf->rx_prod = rx_prod;
tx_buf->action = XDP_TX;
}
static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
@ -63,7 +118,7 @@ static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
{
struct bnxt_sw_tx_bd *tx_buf;
tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
tx_buf = bnxt_xmit_bd(bp, txr, mapping, len, NULL);
tx_buf->action = XDP_REDIRECT;
tx_buf->xdpf = xdpf;
dma_unmap_addr_set(tx_buf, mapping, mapping);
@ -78,7 +133,7 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
struct bnxt_sw_tx_bd *tx_buf;
u16 tx_cons = txr->tx_cons;
u16 last_tx_cons = tx_cons;
int i;
int i, j, frags;
for (i = 0; i < nr_pkts; i++) {
tx_buf = &txr->tx_buf_ring[tx_cons];
@ -96,6 +151,13 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
} else if (tx_buf->action == XDP_TX) {
rx_doorbell_needed = true;
last_tx_cons = tx_cons;
frags = tx_buf->nr_frags;
for (j = 0; j < frags; j++) {
tx_cons = NEXT_TX(tx_cons);
tx_buf = &txr->tx_buf_ring[tx_cons];
page_pool_recycle_direct(rxr->page_pool, tx_buf->page);
}
}
tx_cons = NEXT_TX(tx_cons);
}
@ -103,22 +165,67 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
if (rx_doorbell_needed) {
tx_buf = &txr->tx_buf_ring[last_tx_cons];
bnxt_db_write(bp, &rxr->rx_db, tx_buf->rx_prod);
}
}
bool bnxt_xdp_attached(struct bnxt *bp, struct bnxt_rx_ring_info *rxr)
{
struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
return !!xdp_prog;
}
void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
u16 cons, u8 **data_ptr, unsigned int *len,
struct xdp_buff *xdp)
{
struct bnxt_sw_rx_bd *rx_buf;
struct pci_dev *pdev;
dma_addr_t mapping;
u32 offset;
pdev = bp->pdev;
rx_buf = &rxr->rx_buf_ring[cons];
offset = bp->rx_offset;
mapping = rx_buf->mapping - bp->rx_dma_offset;
dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
xdp_init_buff(xdp, BNXT_PAGE_MODE_BUF_SIZE + offset, &rxr->xdp_rxq);
xdp_prepare_buff(xdp, *data_ptr - offset, offset, *len, false);
}
void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
struct xdp_buff *xdp)
{
struct skb_shared_info *shinfo;
int i;
if (!xdp || !xdp_buff_has_frags(xdp))
return;
shinfo = xdp_get_shared_info_from_buff(xdp);
for (i = 0; i < shinfo->nr_frags; i++) {
struct page *page = skb_frag_page(&shinfo->frags[i]);
page_pool_recycle_direct(rxr->page_pool, page);
}
shinfo->nr_frags = 0;
}
/* returns the following:
* true - packet consumed by XDP and new buffer is allocated.
* false - packet should be passed to the stack.
*/
bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
struct page *page, u8 **data_ptr, unsigned int *len, u8 *event)
struct xdp_buff xdp, struct page *page, unsigned int *len, u8 *event)
{
struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
struct bnxt_tx_ring_info *txr;
struct bnxt_sw_rx_bd *rx_buf;
struct pci_dev *pdev;
struct xdp_buff xdp;
dma_addr_t mapping;
u32 tx_needed = 1;
void *orig_data;
u32 tx_avail;
u32 offset;
@ -128,16 +235,10 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
return false;
pdev = bp->pdev;
rx_buf = &rxr->rx_buf_ring[cons];
offset = bp->rx_offset;
mapping = rx_buf->mapping - bp->rx_dma_offset;
dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
txr = rxr->bnapi->tx_ring;
/* BNXT_RX_PAGE_MODE(bp) when XDP enabled */
xdp_init_buff(&xdp, PAGE_SIZE, &rxr->xdp_rxq);
xdp_prepare_buff(&xdp, *data_ptr - offset, offset, *len, false);
orig_data = xdp.data;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
@ -150,26 +251,38 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
*event &= ~BNXT_RX_EVENT;
*len = xdp.data_end - xdp.data;
if (orig_data != xdp.data) {
if (orig_data != xdp.data)
offset = xdp.data - xdp.data_hard_start;
*data_ptr = xdp.data_hard_start + offset;
}
switch (act) {
case XDP_PASS:
return false;
case XDP_TX:
if (tx_avail < 1) {
rx_buf = &rxr->rx_buf_ring[cons];
mapping = rx_buf->mapping - bp->rx_dma_offset;
*event = 0;
if (unlikely(xdp_buff_has_frags(&xdp))) {
struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(&xdp);
tx_needed += sinfo->nr_frags;
*event = BNXT_AGG_EVENT;
}
if (tx_avail < tx_needed) {
trace_xdp_exception(bp->dev, xdp_prog, act);
bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
}
*event = BNXT_TX_EVENT;
dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
bp->rx_dir);
*event |= BNXT_TX_EVENT;
__bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
NEXT_RX(rxr->rx_prod));
NEXT_RX(rxr->rx_prod), &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
case XDP_REDIRECT:
@ -177,6 +290,8 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
* redirect is coming from a frame received by the
* bnxt_en driver.
*/
rx_buf = &rxr->rx_buf_ring[cons];
mapping = rx_buf->mapping - bp->rx_dma_offset;
dma_unmap_page_attrs(&pdev->dev, mapping,
PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
@ -184,6 +299,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
/* if we are unable to allocate a new buffer, abort and reuse */
if (bnxt_alloc_rx_data(bp, rxr, rxr->rx_prod, GFP_ATOMIC)) {
trace_xdp_exception(bp->dev, xdp_prog, act);
bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
}
@ -203,6 +319,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
trace_xdp_exception(bp->dev, xdp_prog, act);
fallthrough;
case XDP_DROP:
bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
break;
}
@ -270,8 +387,9 @@ static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
int tx_xdp = 0, rc, tc;
struct bpf_prog *old;
if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
netdev_warn(dev, "MTU %d larger than largest XDP supported MTU %d.\n",
if (prog && !prog->aux->xdp_has_frags &&
bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
netdev_warn(dev, "MTU %d larger than %d without XDP frag support.\n",
bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
return -EOPNOTSUPP;
}
@ -337,3 +455,26 @@ int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
return rc;
}
struct sk_buff *
bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, u8 num_frags,
struct page_pool *pool, struct xdp_buff *xdp,
struct rx_cmp_ext *rxcmp1)
{
struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
if (!skb)
return NULL;
skb_checksum_none_assert(skb);
if (RX_CMP_L4_CS_OK(rxcmp1)) {
if (bp->dev->features & NETIF_F_RXCSUM) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->csum_level = RX_CMP_ENCAP(rxcmp1);
}
}
xdp_update_skb_shared_info(skb, num_frags,
sinfo->xdp_frags_size,
PAGE_SIZE * sinfo->nr_frags,
xdp_buff_is_frag_pfmemalloc(xdp));
return skb;
}

16
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
View File

@ -14,13 +14,25 @@ DECLARE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
struct bnxt_tx_ring_info *txr,
dma_addr_t mapping, u32 len);
dma_addr_t mapping, u32 len,
struct xdp_buff *xdp);
void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts);
bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
struct page *page, u8 **data_ptr, unsigned int *len,
struct xdp_buff xdp, struct page *page, unsigned int *len,
u8 *event);
int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp);
int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
struct xdp_frame **frames, u32 flags);
bool bnxt_xdp_attached(struct bnxt *bp, struct bnxt_rx_ring_info *rxr);
void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
u16 cons, u8 **data_ptr, unsigned int *len,
struct xdp_buff *xdp);
void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
struct xdp_buff *xdp);
struct sk_buff *bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb,
u8 num_frags, struct page_pool *pool,
struct xdp_buff *xdp,
struct rx_cmp_ext *rxcmp1);
#endif