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ixgbe: add AF_XDP zero-copy Rx support

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This patch adds zero-copy Rx support for AF_XDP sockets. Instead of
allocating buffers of type MEM_TYPE_PAGE_SHARED, the Rx frames are
allocated as MEM_TYPE_ZERO_COPY when AF_XDP is enabled for a certain
queue.

All AF_XDP specific functions are added to a new file, ixgbe_xsk.c.

Note that when AF_XDP zero-copy is enabled, the XDP action XDP_PASS
will allocate a new buffer and copy the zero-copy frame prior passing
it to the kernel stack.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: William Tu <u9012063@gmail.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Björn Töpel 2018-10-02 10:00:32 +02:00 committed by Jeff Kirsher
parent 46515fdb1a
commit d0bcacd0a1
6 changed files with 745 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/intel/ixgbe/Makefile
View File

@ -8,7 +8,8 @@ obj-$(CONFIG_IXGBE) += ixgbe.o
ixgbe-objs := ixgbe_main.o ixgbe_common.o ixgbe_ethtool.o \
ixgbe_82599.o ixgbe_82598.o ixgbe_phy.o ixgbe_sriov.o \
ixgbe_mbx.o ixgbe_x540.o ixgbe_x550.o ixgbe_lib.o ixgbe_ptp.o
ixgbe_mbx.o ixgbe_x540.o ixgbe_x550.o ixgbe_lib.o ixgbe_ptp.o \
ixgbe_xsk.o
ixgbe-$(CONFIG_IXGBE_DCB) += ixgbe_dcb.o ixgbe_dcb_82598.o \
ixgbe_dcb_82599.o ixgbe_dcb_nl.o

27
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View File

@ -228,13 +228,17 @@ struct ixgbe_tx_buffer {
struct ixgbe_rx_buffer {
struct sk_buff *skb;
dma_addr_t dma;
struct page *page;
#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
__u32 page_offset;
#else
__u16 page_offset;
#endif
__u16 pagecnt_bias;
union {
struct {
struct page *page;
__u32 page_offset;
__u16 pagecnt_bias;
};
struct {
void *addr;
u64 handle;
};
};
};
struct ixgbe_queue_stats {
@ -348,6 +352,10 @@ struct ixgbe_ring {
struct ixgbe_rx_queue_stats rx_stats;
};
struct xdp_rxq_info xdp_rxq;
struct xdp_umem *xsk_umem;
struct zero_copy_allocator zca; /* ZC allocator anchor */
u16 ring_idx; /* {rx,tx,xdp}_ring back reference idx */
u16 rx_buf_len;
} ____cacheline_internodealigned_in_smp;
enum ixgbe_ring_f_enum {
@ -765,6 +773,11 @@ struct ixgbe_adapter {
#ifdef CONFIG_XFRM_OFFLOAD
struct ixgbe_ipsec *ipsec;
#endif /* CONFIG_XFRM_OFFLOAD */
/* AF_XDP zero-copy */
struct xdp_umem **xsk_umems;
u16 num_xsk_umems_used;
u16 num_xsk_umems;
};
static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)

17
drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
View File

@ -1055,7 +1055,7 @@ static int ixgbe_alloc_q_vectors(struct ixgbe_adapter *adapter)
int txr_remaining = adapter->num_tx_queues;
int xdp_remaining = adapter->num_xdp_queues;
int rxr_idx = 0, txr_idx = 0, xdp_idx = 0, v_idx = 0;
int err;
int err, i;
/* only one q_vector if MSI-X is disabled. */
if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
@ -1097,6 +1097,21 @@ static int ixgbe_alloc_q_vectors(struct ixgbe_adapter *adapter)
xdp_idx += xqpv;
}
for (i = 0; i < adapter->num_rx_queues; i++) {
if (adapter->rx_ring[i])
adapter->rx_ring[i]->ring_idx = i;
}
for (i = 0; i < adapter->num_tx_queues; i++) {
if (adapter->tx_ring[i])
adapter->tx_ring[i]->ring_idx = i;
}
for (i = 0; i < adapter->num_xdp_queues; i++) {
if (adapter->xdp_ring[i])
adapter->xdp_ring[i]->ring_idx = i;
}
return 0;
err_out:

78
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -34,6 +34,7 @@
#include <net/tc_act/tc_mirred.h>
#include <net/vxlan.h>
#include <net/mpls.h>
#include <net/xdp_sock.h>
#include "ixgbe.h"
#include "ixgbe_common.h"
@ -3176,7 +3177,10 @@ int ixgbe_poll(struct napi_struct *napi, int budget)
per_ring_budget = budget;
ixgbe_for_each_ring(ring, q_vector->rx) {
int cleaned = ixgbe_clean_rx_irq(q_vector, ring,
int cleaned = ring->xsk_umem ?
ixgbe_clean_rx_irq_zc(q_vector, ring,
per_ring_budget) :
ixgbe_clean_rx_irq(q_vector, ring,
per_ring_budget);
work_done += cleaned;
@ -3704,10 +3708,27 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
srrctl = IXGBE_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
/* configure the packet buffer length */
if (test_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state))
if (rx_ring->xsk_umem) {
u32 xsk_buf_len = rx_ring->xsk_umem->chunk_size_nohr -
XDP_PACKET_HEADROOM;
/* If the MAC support setting RXDCTL.RLPML, the
* SRRCTL[n].BSIZEPKT is set to PAGE_SIZE and
* RXDCTL.RLPML is set to the actual UMEM buffer
* size. If not, then we are stuck with a 1k buffer
* size resolution. In this case frames larger than
* the UMEM buffer size viewed in a 1k resolution will
* be dropped.
*/
if (hw->mac.type != ixgbe_mac_82599EB)
srrctl |= PAGE_SIZE >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
else
srrctl |= xsk_buf_len >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
} else if (test_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state)) {
srrctl |= IXGBE_RXBUFFER_3K >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
else
} else {
srrctl |= IXGBE_RXBUFFER_2K >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
}
/* configure descriptor type */
srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
@ -4030,6 +4051,19 @@ void ixgbe_configure_rx_ring(struct ixgbe_adapter *adapter,
u32 rxdctl;
u8 reg_idx = ring->reg_idx;
xdp_rxq_info_unreg_mem_model(&ring->xdp_rxq);
ring->xsk_umem = ixgbe_xsk_umem(adapter, ring);
if (ring->xsk_umem) {
ring->zca.free = ixgbe_zca_free;
WARN_ON(xdp_rxq_info_reg_mem_model(&ring->xdp_rxq,
MEM_TYPE_ZERO_COPY,
&ring->zca));
} else {
WARN_ON(xdp_rxq_info_reg_mem_model(&ring->xdp_rxq,
MEM_TYPE_PAGE_SHARED, NULL));
}
/* disable queue to avoid use of these values while updating state */
rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(reg_idx));
rxdctl &= ~IXGBE_RXDCTL_ENABLE;
@ -4079,6 +4113,17 @@ void ixgbe_configure_rx_ring(struct ixgbe_adapter *adapter,
#endif
}
if (ring->xsk_umem && hw->mac.type != ixgbe_mac_82599EB) {
u32 xsk_buf_len = ring->xsk_umem->chunk_size_nohr -
XDP_PACKET_HEADROOM;
rxdctl &= ~(IXGBE_RXDCTL_RLPMLMASK |
IXGBE_RXDCTL_RLPML_EN);
rxdctl |= xsk_buf_len | IXGBE_RXDCTL_RLPML_EN;
ring->rx_buf_len = xsk_buf_len;
}
/* initialize rx_buffer_info */
memset(ring->rx_buffer_info, 0,
sizeof(struct ixgbe_rx_buffer) * ring->count);
@ -4092,7 +4137,10 @@ void ixgbe_configure_rx_ring(struct ixgbe_adapter *adapter,
IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(reg_idx), rxdctl);
ixgbe_rx_desc_queue_enable(adapter, ring);
ixgbe_alloc_rx_buffers(ring, ixgbe_desc_unused(ring));
if (ring->xsk_umem)
ixgbe_alloc_rx_buffers_zc(ring, ixgbe_desc_unused(ring));
else
ixgbe_alloc_rx_buffers(ring, ixgbe_desc_unused(ring));
}
static void ixgbe_setup_psrtype(struct ixgbe_adapter *adapter)
@ -5206,6 +5254,11 @@ static void ixgbe_clean_rx_ring(struct ixgbe_ring *rx_ring)
u16 i = rx_ring->next_to_clean;
struct ixgbe_rx_buffer *rx_buffer = &rx_ring->rx_buffer_info[i];
if (rx_ring->xsk_umem) {
ixgbe_xsk_clean_rx_ring(rx_ring);
goto skip_free;
}
/* Free all the Rx ring sk_buffs */
while (i != rx_ring->next_to_alloc) {
if (rx_buffer->skb) {
@ -5244,6 +5297,7 @@ static void ixgbe_clean_rx_ring(struct ixgbe_ring *rx_ring)
}
}
skip_free:
rx_ring->next_to_alloc = 0;
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
@ -6439,7 +6493,7 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
struct device *dev = rx_ring->dev;
int orig_node = dev_to_node(dev);
int ring_node = -1;
int size, err;
int size;
size = sizeof(struct ixgbe_rx_buffer) * rx_ring->count;
@ -6476,13 +6530,6 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
rx_ring->queue_index) < 0)
goto err;
err = xdp_rxq_info_reg_mem_model(&rx_ring->xdp_rxq,
MEM_TYPE_PAGE_SHARED, NULL);
if (err) {
xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
goto err;
}
rx_ring->xdp_prog = adapter->xdp_prog;
return 0;
@ -10198,6 +10245,13 @@ static int ixgbe_xdp(struct net_device *dev, struct netdev_bpf *xdp)
xdp->prog_id = adapter->xdp_prog ?
adapter->xdp_prog->aux->id : 0;
return 0;
case XDP_QUERY_XSK_UMEM:
return ixgbe_xsk_umem_query(adapter, &xdp->xsk.umem,
xdp->xsk.queue_id);
case XDP_SETUP_XSK_UMEM:
return ixgbe_xsk_umem_setup(adapter, xdp->xsk.umem,
xdp->xsk.queue_id);
default:
return -EINVAL;
}

15
drivers/net/ethernet/intel/ixgbe/ixgbe_txrx_common.h
View File

@ -23,4 +23,19 @@ void ixgbe_rx_skb(struct ixgbe_q_vector *q_vector,
void ixgbe_txrx_ring_disable(struct ixgbe_adapter *adapter, int ring);
void ixgbe_txrx_ring_enable(struct ixgbe_adapter *adapter, int ring);
struct xdp_umem *ixgbe_xsk_umem(struct ixgbe_adapter *adapter,
struct ixgbe_ring *ring);
int ixgbe_xsk_umem_query(struct ixgbe_adapter *adapter, struct xdp_umem **umem,
u16 qid);
int ixgbe_xsk_umem_setup(struct ixgbe_adapter *adapter, struct xdp_umem *umem,
u16 qid);
void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle);
void ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 cleaned_count);
int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,
struct ixgbe_ring *rx_ring,
const int budget);
void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring);
#endif /* #define _IXGBE_TXRX_COMMON_H_ */

626
drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c Normal file
View File

@ -0,0 +1,626 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2018 Intel Corporation. */
#include <linux/bpf_trace.h>
#include <net/xdp_sock.h>
#include <net/xdp.h>
#include "ixgbe.h"
#include "ixgbe_txrx_common.h"
struct xdp_umem *ixgbe_xsk_umem(struct ixgbe_adapter *adapter,
struct ixgbe_ring *ring)
{
bool xdp_on = READ_ONCE(adapter->xdp_prog);
int qid = ring->ring_idx;
if (!adapter->xsk_umems || !adapter->xsk_umems[qid] ||
qid >= adapter->num_xsk_umems || !xdp_on)
return NULL;
return adapter->xsk_umems[qid];
}
static int ixgbe_alloc_xsk_umems(struct ixgbe_adapter *adapter)
{
if (adapter->xsk_umems)
return 0;
adapter->num_xsk_umems_used = 0;
adapter->num_xsk_umems = adapter->num_rx_queues;
adapter->xsk_umems = kcalloc(adapter->num_xsk_umems,
sizeof(*adapter->xsk_umems),
GFP_KERNEL);
if (!adapter->xsk_umems) {
adapter->num_xsk_umems = 0;
return -ENOMEM;
}
return 0;
}
static int ixgbe_add_xsk_umem(struct ixgbe_adapter *adapter,
struct xdp_umem *umem,
u16 qid)
{
int err;
err = ixgbe_alloc_xsk_umems(adapter);
if (err)
return err;
adapter->xsk_umems[qid] = umem;
adapter->num_xsk_umems_used++;
return 0;
}
static void ixgbe_remove_xsk_umem(struct ixgbe_adapter *adapter, u16 qid)
{
adapter->xsk_umems[qid] = NULL;
adapter->num_xsk_umems_used--;
if (adapter->num_xsk_umems == 0) {
kfree(adapter->xsk_umems);
adapter->xsk_umems = NULL;
adapter->num_xsk_umems = 0;
}
}
static int ixgbe_xsk_umem_dma_map(struct ixgbe_adapter *adapter,
struct xdp_umem *umem)
{
struct device *dev = &adapter->pdev->dev;
unsigned int i, j;
dma_addr_t dma;
for (i = 0; i < umem->npgs; i++) {
dma = dma_map_page_attrs(dev, umem->pgs[i], 0, PAGE_SIZE,
DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
if (dma_mapping_error(dev, dma))
goto out_unmap;
umem->pages[i].dma = dma;
}
return 0;
out_unmap:
for (j = 0; j < i; j++) {
dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
umem->pages[i].dma = 0;
}
return -1;
}
static void ixgbe_xsk_umem_dma_unmap(struct ixgbe_adapter *adapter,
struct xdp_umem *umem)
{
struct device *dev = &adapter->pdev->dev;
unsigned int i;
for (i = 0; i < umem->npgs; i++) {
dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
umem->pages[i].dma = 0;
}
}
static int ixgbe_xsk_umem_enable(struct ixgbe_adapter *adapter,
struct xdp_umem *umem,
u16 qid)
{
struct xdp_umem_fq_reuse *reuseq;
bool if_running;
int err;
if (qid >= adapter->num_rx_queues)
return -EINVAL;
if (adapter->xsk_umems) {
if (qid >= adapter->num_xsk_umems)
return -EINVAL;
if (adapter->xsk_umems[qid])
return -EBUSY;
}
reuseq = xsk_reuseq_prepare(adapter->rx_ring[0]->count);
if (!reuseq)
return -ENOMEM;
xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
err = ixgbe_xsk_umem_dma_map(adapter, umem);
if (err)
return err;
if_running = netif_running(adapter->netdev) &&
READ_ONCE(adapter->xdp_prog);
if (if_running)
ixgbe_txrx_ring_disable(adapter, qid);
err = ixgbe_add_xsk_umem(adapter, umem, qid);
if (if_running)
ixgbe_txrx_ring_enable(adapter, qid);
return err;
}
static int ixgbe_xsk_umem_disable(struct ixgbe_adapter *adapter, u16 qid)
{
bool if_running;
if (!adapter->xsk_umems || qid >= adapter->num_xsk_umems ||
!adapter->xsk_umems[qid])
return -EINVAL;
if_running = netif_running(adapter->netdev) &&
READ_ONCE(adapter->xdp_prog);
if (if_running)
ixgbe_txrx_ring_disable(adapter, qid);
ixgbe_xsk_umem_dma_unmap(adapter, adapter->xsk_umems[qid]);
ixgbe_remove_xsk_umem(adapter, qid);
if (if_running)
ixgbe_txrx_ring_enable(adapter, qid);
return 0;
}
int ixgbe_xsk_umem_query(struct ixgbe_adapter *adapter, struct xdp_umem **umem,
u16 qid)
{
if (qid >= adapter->num_rx_queues)
return -EINVAL;
if (adapter->xsk_umems) {
if (qid >= adapter->num_xsk_umems)
return -EINVAL;
*umem = adapter->xsk_umems[qid];
return 0;
}
*umem = NULL;
return 0;
}
int ixgbe_xsk_umem_setup(struct ixgbe_adapter *adapter, struct xdp_umem *umem,
u16 qid)
{
return umem ? ixgbe_xsk_umem_enable(adapter, umem, qid) :
ixgbe_xsk_umem_disable(adapter, qid);
}
static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
struct ixgbe_ring *rx_ring,
struct xdp_buff *xdp)
{
int err, result = IXGBE_XDP_PASS;
struct bpf_prog *xdp_prog;
struct xdp_frame *xdpf;
u32 act;
rcu_read_lock();
xdp_prog = READ_ONCE(rx_ring->xdp_prog);
act = bpf_prog_run_xdp(xdp_prog, xdp);
xdp->handle += xdp->data - xdp->data_hard_start;
switch (act) {
case XDP_PASS:
break;
case XDP_TX:
xdpf = convert_to_xdp_frame(xdp);
if (unlikely(!xdpf)) {
result = IXGBE_XDP_CONSUMED;
break;
}
result = ixgbe_xmit_xdp_ring(adapter, xdpf);
break;
case XDP_REDIRECT:
err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
break;
default:
bpf_warn_invalid_xdp_action(act);
/* fallthrough */
case XDP_ABORTED:
trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
/* fallthrough -- handle aborts by dropping packet */
case XDP_DROP:
result = IXGBE_XDP_CONSUMED;
break;
}
rcu_read_unlock();
return result;
}
static struct
ixgbe_rx_buffer *ixgbe_get_rx_buffer_zc(struct ixgbe_ring *rx_ring,
unsigned int size)
{
struct ixgbe_rx_buffer *bi;
bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
/* we are reusing so sync this buffer for CPU use */
dma_sync_single_range_for_cpu(rx_ring->dev,
bi->dma, 0,
size,
DMA_BIDIRECTIONAL);
return bi;
}
static void ixgbe_reuse_rx_buffer_zc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *obi)
{
unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask;
u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
u16 nta = rx_ring->next_to_alloc;
struct ixgbe_rx_buffer *nbi;
nbi = &rx_ring->rx_buffer_info[rx_ring->next_to_alloc];
/* update, and store next to alloc */
nta++;
rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
/* transfer page from old buffer to new buffer */
nbi->dma = obi->dma & mask;
nbi->dma += hr;
nbi->addr = (void *)((unsigned long)obi->addr & mask);
nbi->addr += hr;
nbi->handle = obi->handle & mask;
nbi->handle += rx_ring->xsk_umem->headroom;
obi->addr = NULL;
obi->skb = NULL;
}
void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
{
struct ixgbe_rx_buffer *bi;
struct ixgbe_ring *rx_ring;
u64 hr, mask;
u16 nta;
rx_ring = container_of(alloc, struct ixgbe_ring, zca);
hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
mask = rx_ring->xsk_umem->chunk_mask;
nta = rx_ring->next_to_alloc;
bi = rx_ring->rx_buffer_info;
nta++;
rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
handle &= mask;
bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
bi->dma += hr;
bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
bi->addr += hr;
bi->handle = (u64)handle + rx_ring->xsk_umem->headroom;
}
static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi)
{
struct xdp_umem *umem = rx_ring->xsk_umem;
void *addr = bi->addr;
u64 handle, hr;
if (addr)
return true;
if (!xsk_umem_peek_addr(umem, &handle)) {
rx_ring->rx_stats.alloc_rx_page_failed++;
return false;
}
hr = umem->headroom + XDP_PACKET_HEADROOM;
bi->dma = xdp_umem_get_dma(umem, handle);
bi->dma += hr;
bi->addr = xdp_umem_get_data(umem, handle);
bi->addr += hr;
bi->handle = handle + umem->headroom;
xsk_umem_discard_addr(umem);
return true;
}
static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi)
{
struct xdp_umem *umem = rx_ring->xsk_umem;
u64 handle, hr;
if (!xsk_umem_peek_addr_rq(umem, &handle)) {
rx_ring->rx_stats.alloc_rx_page_failed++;
return false;
}
handle &= rx_ring->xsk_umem->chunk_mask;
hr = umem->headroom + XDP_PACKET_HEADROOM;
bi->dma = xdp_umem_get_dma(umem, handle);
bi->dma += hr;
bi->addr = xdp_umem_get_data(umem, handle);
bi->addr += hr;
bi->handle = handle + umem->headroom;
xsk_umem_discard_addr_rq(umem);
return true;
}
static __always_inline bool
__ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 cleaned_count,
bool alloc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi))
{
union ixgbe_adv_rx_desc *rx_desc;
struct ixgbe_rx_buffer *bi;
u16 i = rx_ring->next_to_use;
bool ok = true;
/* nothing to do */
if (!cleaned_count)
return true;
rx_desc = IXGBE_RX_DESC(rx_ring, i);
bi = &rx_ring->rx_buffer_info[i];
i -= rx_ring->count;
do {
if (!alloc(rx_ring, bi)) {
ok = false;
break;
}
/* sync the buffer for use by the device */
dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
bi->page_offset,
rx_ring->rx_buf_len,
DMA_BIDIRECTIONAL);
/* Refresh the desc even if buffer_addrs didn't change
* because each write-back erases this info.
*/
rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
rx_desc++;
bi++;
i++;
if (unlikely(!i)) {
rx_desc = IXGBE_RX_DESC(rx_ring, 0);
bi = rx_ring->rx_buffer_info;
i -= rx_ring->count;
}
/* clear the length for the next_to_use descriptor */
rx_desc->wb.upper.length = 0;
cleaned_count--;
} while (cleaned_count);
i += rx_ring->count;
if (rx_ring->next_to_use != i) {
rx_ring->next_to_use = i;
/* update next to alloc since we have filled the ring */
rx_ring->next_to_alloc = i;
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64).
*/
wmb();
writel(i, rx_ring->tail);
}
return ok;
}
void ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
{
__ixgbe_alloc_rx_buffers_zc(rx_ring, count,
ixgbe_alloc_buffer_slow_zc);
}
static bool ixgbe_alloc_rx_buffers_fast_zc(struct ixgbe_ring *rx_ring,
u16 count)
{
return __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
ixgbe_alloc_buffer_zc);
}
static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi,
struct xdp_buff *xdp)
{
unsigned int metasize = xdp->data - xdp->data_meta;
unsigned int datasize = xdp->data_end - xdp->data;
struct sk_buff *skb;
/* allocate a skb to store the frags */
skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
xdp->data_end - xdp->data_hard_start,
GFP_ATOMIC | __GFP_NOWARN);
if (unlikely(!skb))
return NULL;
skb_reserve(skb, xdp->data - xdp->data_hard_start);
memcpy(__skb_put(skb, datasize), xdp->data, datasize);
if (metasize)
skb_metadata_set(skb, metasize);
ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
return skb;
}
static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring)
{
u32 ntc = rx_ring->next_to_clean + 1;
ntc = (ntc < rx_ring->count) ? ntc : 0;
rx_ring->next_to_clean = ntc;
prefetch(IXGBE_RX_DESC(rx_ring, ntc));
}
int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,
struct ixgbe_ring *rx_ring,
const int budget)
{
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
struct ixgbe_adapter *adapter = q_vector->adapter;
u16 cleaned_count = ixgbe_desc_unused(rx_ring);
unsigned int xdp_res, xdp_xmit = 0;
bool failure = false;
struct sk_buff *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 ixgbe_rx_buffer *bi;
unsigned int size;
/* return some buffers to hardware, one at a time is too slow */
if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
failure = failure ||
!ixgbe_alloc_rx_buffers_fast_zc(rx_ring,
cleaned_count);
cleaned_count = 0;
}
rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean);
size = le16_to_cpu(rx_desc->wb.upper.length);
if (!size)
break;
/* This memory barrier is needed to keep us from reading
* any other fields out of the rx_desc until we know the
* descriptor has been written back
*/
dma_rmb();
bi = ixgbe_get_rx_buffer_zc(rx_ring, size);
if (unlikely(!ixgbe_test_staterr(rx_desc,
IXGBE_RXD_STAT_EOP))) {
struct ixgbe_rx_buffer *next_bi;
ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
ixgbe_inc_ntc(rx_ring);
next_bi =
&rx_ring->rx_buffer_info[rx_ring->next_to_clean];
next_bi->skb = ERR_PTR(-EINVAL);
continue;
}
if (unlikely(bi->skb)) {
ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
ixgbe_inc_ntc(rx_ring);
continue;
}
xdp.data = bi->addr;
xdp.data_meta = xdp.data;
xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
xdp.data_end = xdp.data + size;
xdp.handle = bi->handle;
xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, &xdp);
if (xdp_res) {
if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
xdp_xmit |= xdp_res;
bi->addr = NULL;
bi->skb = NULL;
} else {
ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
}
total_rx_packets++;
total_rx_bytes += size;
cleaned_count++;
ixgbe_inc_ntc(rx_ring);
continue;
}
/* XDP_PASS path */
skb = ixgbe_construct_skb_zc(rx_ring, bi, &xdp);
if (!skb) {
rx_ring->rx_stats.alloc_rx_buff_failed++;
break;
}
cleaned_count++;
ixgbe_inc_ntc(rx_ring);
if (eth_skb_pad(skb))
continue;
total_rx_bytes += skb->len;
total_rx_packets++;
ixgbe_process_skb_fields(rx_ring, rx_desc, skb);
ixgbe_rx_skb(q_vector, skb);
}
if (xdp_xmit & IXGBE_XDP_REDIR)
xdp_do_flush_map();
if (xdp_xmit & IXGBE_XDP_TX) {
struct ixgbe_ring *ring = adapter->xdp_ring[smp_processor_id()];
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch.
*/
wmb();
writel(ring->next_to_use, ring->tail);
}
u64_stats_update_begin(&rx_ring->syncp);
rx_ring->stats.packets += total_rx_packets;
rx_ring->stats.bytes += total_rx_bytes;
u64_stats_update_end(&rx_ring->syncp);
q_vector->rx.total_packets += total_rx_packets;
q_vector->rx.total_bytes += total_rx_bytes;
return failure ? budget : (int)total_rx_packets;
}
void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring)
{
u16 i = rx_ring->next_to_clean;
struct ixgbe_rx_buffer *bi = &rx_ring->rx_buffer_info[i];
while (i != rx_ring->next_to_alloc) {
xsk_umem_fq_reuse(rx_ring->xsk_umem, bi->handle);
i++;
bi++;
if (i == rx_ring->count) {
i = 0;
bi = rx_ring->rx_buffer_info;
}
}
}