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Merge branch 'thunderx-xdp'

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Sunil Goutham says:

====================
net: thunderx: Adds XDP support

This patch series adds support for XDP to ThunderX NIC driver
which is used on CN88xx, CN81xx and CN83xx platforms.

Patches 1-4 are performance improvement and cleanup patches
which are done keeping XDP performance bottlenecks in view.
Rest of the patches adds actual XDP support.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-05-02 15:41:23 -04:00
commit b0e92279d3
6 changed files with 660 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/cavium/thunder/nic.h
View File

@ -252,12 +252,14 @@ struct nicvf_drv_stats {
u64 tx_csum_overflow;
/* driver debug stats */
u64 rcv_buffer_alloc_failures;
u64 tx_tso;
u64 tx_timeout;
u64 txq_stop;
u64 txq_wake;
u64 rcv_buffer_alloc_failures;
u64 page_alloc;
struct u64_stats_sync syncp;
};
@ -266,9 +268,9 @@ struct nicvf {
struct net_device *netdev;
struct pci_dev *pdev;
void __iomem *reg_base;
struct bpf_prog *xdp_prog;
#define MAX_QUEUES_PER_QSET 8
struct queue_set *qs;
struct nicvf_cq_poll *napi[8];
void *iommu_domain;
u8 vf_id;
u8 sqs_id;
@ -294,6 +296,7 @@ struct nicvf {
/* Queue count */
u8 rx_queues;
u8 tx_queues;
u8 xdp_tx_queues;
u8 max_queues;
u8 node;
@ -318,6 +321,9 @@ struct nicvf {
struct nicvf_drv_stats __percpu *drv_stats;
struct bgx_stats bgx_stats;
/* Napi */
struct nicvf_cq_poll *napi[8];
/* MSI-X */
u8 num_vec;
char irq_name[NIC_VF_MSIX_VECTORS][IFNAMSIZ + 15];

29
drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
View File

@ -100,11 +100,12 @@ static const struct nicvf_stat nicvf_drv_stats[] = {
NICVF_DRV_STAT(tx_csum_overlap),
NICVF_DRV_STAT(tx_csum_overflow),
NICVF_DRV_STAT(rcv_buffer_alloc_failures),
NICVF_DRV_STAT(tx_tso),
NICVF_DRV_STAT(tx_timeout),
NICVF_DRV_STAT(txq_stop),
NICVF_DRV_STAT(txq_wake),
NICVF_DRV_STAT(rcv_buffer_alloc_failures),
NICVF_DRV_STAT(page_alloc),
};
static const struct nicvf_stat nicvf_queue_stats[] = {
@ -720,7 +721,7 @@ static int nicvf_set_channels(struct net_device *dev,
struct nicvf *nic = netdev_priv(dev);
int err = 0;
bool if_up = netif_running(dev);
int cqcount;
u8 cqcount, txq_count;
if (!channel->rx_count || !channel->tx_count)
return -EINVAL;
@ -729,10 +730,26 @@ static int nicvf_set_channels(struct net_device *dev,
if (channel->tx_count > nic->max_queues)
return -EINVAL;
if (nic->xdp_prog &&
((channel->tx_count + channel->rx_count) > nic->max_queues)) {
netdev_err(nic->netdev,
"XDP mode, RXQs + TXQs > Max %d\n",
nic->max_queues);
return -EINVAL;
}
if (if_up)
nicvf_stop(dev);
cqcount = max(channel->rx_count, channel->tx_count);
nic->rx_queues = channel->rx_count;
nic->tx_queues = channel->tx_count;
if (!nic->xdp_prog)
nic->xdp_tx_queues = 0;
else
nic->xdp_tx_queues = channel->rx_count;
txq_count = nic->xdp_tx_queues + nic->tx_queues;
cqcount = max(nic->rx_queues, txq_count);
if (cqcount > MAX_CMP_QUEUES_PER_QS) {
nic->sqs_count = roundup(cqcount, MAX_CMP_QUEUES_PER_QS);
@ -741,12 +758,10 @@ static int nicvf_set_channels(struct net_device *dev,
nic->sqs_count = 0;
}
nic->qs->rq_cnt = min_t(u32, channel->rx_count, MAX_RCV_QUEUES_PER_QS);
nic->qs->sq_cnt = min_t(u32, channel->tx_count, MAX_SND_QUEUES_PER_QS);
nic->qs->rq_cnt = min_t(u8, nic->rx_queues, MAX_RCV_QUEUES_PER_QS);
nic->qs->sq_cnt = min_t(u8, txq_count, MAX_SND_QUEUES_PER_QS);
nic->qs->cq_cnt = max(nic->qs->rq_cnt, nic->qs->sq_cnt);
nic->rx_queues = channel->rx_count;
nic->tx_queues = channel->tx_count;
err = nicvf_set_real_num_queues(dev, nic->tx_queues, nic->rx_queues);
if (err)
return err;

315
drivers/net/ethernet/cavium/thunder/nicvf_main.c
View File

@ -17,6 +17,9 @@
#include <linux/prefetch.h>
#include <linux/irq.h>
#include <linux/iommu.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/filter.h>
#include "nic_reg.h"
#include "nic.h"
@ -397,8 +400,10 @@ static void nicvf_request_sqs(struct nicvf *nic)
if (nic->rx_queues > MAX_RCV_QUEUES_PER_QS)
rx_queues = nic->rx_queues - MAX_RCV_QUEUES_PER_QS;
if (nic->tx_queues > MAX_SND_QUEUES_PER_QS)
tx_queues = nic->tx_queues - MAX_SND_QUEUES_PER_QS;
tx_queues = nic->tx_queues + nic->xdp_tx_queues;
if (tx_queues > MAX_SND_QUEUES_PER_QS)
tx_queues = tx_queues - MAX_SND_QUEUES_PER_QS;
/* Set no of Rx/Tx queues in each of the SQsets */
for (sqs = 0; sqs < nic->sqs_count; sqs++) {
@ -496,12 +501,99 @@ static int nicvf_init_resources(struct nicvf *nic)
return 0;
}
static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
struct cqe_rx_t *cqe_rx, struct snd_queue *sq,
struct sk_buff **skb)
{
struct xdp_buff xdp;
struct page *page;
u32 action;
u16 len, offset = 0;
u64 dma_addr, cpu_addr;
void *orig_data;
/* Retrieve packet buffer's DMA address and length */
len = *((u16 *)((void *)cqe_rx + (3 * sizeof(u64))));
dma_addr = *((u64 *)((void *)cqe_rx + (7 * sizeof(u64))));
cpu_addr = nicvf_iova_to_phys(nic, dma_addr);
if (!cpu_addr)
return false;
cpu_addr = (u64)phys_to_virt(cpu_addr);
page = virt_to_page((void *)cpu_addr);
xdp.data_hard_start = page_address(page);
xdp.data = (void *)cpu_addr;
xdp.data_end = xdp.data + len;
orig_data = xdp.data;
rcu_read_lock();
action = bpf_prog_run_xdp(prog, &xdp);
rcu_read_unlock();
/* Check if XDP program has changed headers */
if (orig_data != xdp.data) {
len = xdp.data_end - xdp.data;
offset = orig_data - xdp.data;
dma_addr -= offset;
}
switch (action) {
case XDP_PASS:
/* Check if it's a recycled page, if not
* unmap the DMA mapping.
*
* Recycled page holds an extra reference.
*/
if (page_ref_count(page) == 1) {
dma_addr &= PAGE_MASK;
dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
}
/* Build SKB and pass on packet to network stack */
*skb = build_skb(xdp.data,
RCV_FRAG_LEN - cqe_rx->align_pad + offset);
if (!*skb)
put_page(page);
else
skb_put(*skb, len);
return false;
case XDP_TX:
nicvf_xdp_sq_append_pkt(nic, sq, (u64)xdp.data, dma_addr, len);
return true;
default:
bpf_warn_invalid_xdp_action(action);
case XDP_ABORTED:
trace_xdp_exception(nic->netdev, prog, action);
case XDP_DROP:
/* Check if it's a recycled page, if not
* unmap the DMA mapping.
*
* Recycled page holds an extra reference.
*/
if (page_ref_count(page) == 1) {
dma_addr &= PAGE_MASK;
dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
}
put_page(page);
return true;
}
return false;
}
static void nicvf_snd_pkt_handler(struct net_device *netdev,
struct cqe_send_t *cqe_tx,
int cqe_type, int budget,
int budget, int *subdesc_cnt,
unsigned int *tx_pkts, unsigned int *tx_bytes)
{
struct sk_buff *skb = NULL;
struct page *page;
struct nicvf *nic = netdev_priv(netdev);
struct snd_queue *sq;
struct sq_hdr_subdesc *hdr;
@ -513,12 +605,26 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER)
return;
netdev_dbg(nic->netdev,
"%s Qset #%d SQ #%d SQ ptr #%d subdesc count %d\n",
__func__, cqe_tx->sq_qs, cqe_tx->sq_idx,
cqe_tx->sqe_ptr, hdr->subdesc_cnt);
/* Check for errors */
if (cqe_tx->send_status)
nicvf_check_cqe_tx_errs(nic->pnicvf, cqe_tx);
/* Is this a XDP designated Tx queue */
if (sq->is_xdp) {
page = (struct page *)sq->xdp_page[cqe_tx->sqe_ptr];
/* Check if it's recycled page or else unmap DMA mapping */
if (page && (page_ref_count(page) == 1))
nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr,
hdr->subdesc_cnt);
/* Release page reference for recycling */
if (page)
put_page(page);
sq->xdp_page[cqe_tx->sqe_ptr] = (u64)NULL;
*subdesc_cnt += hdr->subdesc_cnt + 1;
return;
}
nicvf_check_cqe_tx_errs(nic, cqe_tx);
skb = (struct sk_buff *)sq->skbuff[cqe_tx->sqe_ptr];
if (skb) {
/* Check for dummy descriptor used for HW TSO offload on 88xx */
@ -528,12 +634,12 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
(struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2);
nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2,
tso_sqe->subdesc_cnt);
nicvf_put_sq_desc(sq, tso_sqe->subdesc_cnt + 1);
*subdesc_cnt += tso_sqe->subdesc_cnt + 1;
} else {
nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr,
hdr->subdesc_cnt);
}
nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
*subdesc_cnt += hdr->subdesc_cnt + 1;
prefetch(skb);
(*tx_pkts)++;
*tx_bytes += skb->len;
@ -544,7 +650,7 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
* a SKB attached, so just free SQEs here.
*/
if (!nic->hw_tso)
nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
*subdesc_cnt += hdr->subdesc_cnt + 1;
}
}
@ -578,9 +684,9 @@ static inline void nicvf_set_rxhash(struct net_device *netdev,
static void nicvf_rcv_pkt_handler(struct net_device *netdev,
struct napi_struct *napi,
struct cqe_rx_t *cqe_rx)
struct cqe_rx_t *cqe_rx, struct snd_queue *sq)
{
struct sk_buff *skb;
struct sk_buff *skb = NULL;
struct nicvf *nic = netdev_priv(netdev);
struct nicvf *snic = nic;
int err = 0;
@ -595,16 +701,25 @@ static void nicvf_rcv_pkt_handler(struct net_device *netdev,
}
/* Check for errors */
err = nicvf_check_cqe_rx_errs(nic, cqe_rx);
if (err && !cqe_rx->rb_cnt)
return;
skb = nicvf_get_rcv_skb(snic, cqe_rx);
if (!skb) {
netdev_dbg(nic->netdev, "Packet not received\n");
return;
if (cqe_rx->err_level || cqe_rx->err_opcode) {
err = nicvf_check_cqe_rx_errs(nic, cqe_rx);
if (err && !cqe_rx->rb_cnt)
return;
}
/* For XDP, ignore pkts spanning multiple pages */
if (nic->xdp_prog && (cqe_rx->rb_cnt == 1)) {
/* Packet consumed by XDP */
if (nicvf_xdp_rx(snic, nic->xdp_prog, cqe_rx, sq, &skb))
return;
} else {
skb = nicvf_get_rcv_skb(snic, cqe_rx,
nic->xdp_prog ? true : false);
}
if (!skb)
return;
if (netif_msg_pktdata(nic)) {
netdev_info(nic->netdev, "%s: skb 0x%p, len=%d\n", netdev->name,
skb, skb->len);
@ -646,13 +761,14 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
{
int processed_cqe, work_done = 0, tx_done = 0;
int cqe_count, cqe_head;
int subdesc_cnt = 0;
struct nicvf *nic = netdev_priv(netdev);
struct queue_set *qs = nic->qs;
struct cmp_queue *cq = &qs->cq[cq_idx];
struct cqe_rx_t *cq_desc;
struct netdev_queue *txq;
struct snd_queue *sq;
unsigned int tx_pkts = 0, tx_bytes = 0;
struct snd_queue *sq = &qs->sq[cq_idx];
unsigned int tx_pkts = 0, tx_bytes = 0, txq_idx;
spin_lock_bh(&cq->lock);
loop:
@ -667,8 +783,6 @@ loop:
cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9;
cqe_head &= 0xFFFF;
netdev_dbg(nic->netdev, "%s CQ%d cqe_count %d cqe_head %d\n",
__func__, cq_idx, cqe_count, cqe_head);
while (processed_cqe < cqe_count) {
/* Get the CQ descriptor */
cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
@ -682,17 +796,15 @@ loop:
break;
}
netdev_dbg(nic->netdev, "CQ%d cq_desc->cqe_type %d\n",
cq_idx, cq_desc->cqe_type);
switch (cq_desc->cqe_type) {
case CQE_TYPE_RX:
nicvf_rcv_pkt_handler(netdev, napi, cq_desc);
nicvf_rcv_pkt_handler(netdev, napi, cq_desc, sq);
work_done++;
break;
case CQE_TYPE_SEND:
nicvf_snd_pkt_handler(netdev,
(void *)cq_desc, CQE_TYPE_SEND,
budget, &tx_pkts, &tx_bytes);
nicvf_snd_pkt_handler(netdev, (void *)cq_desc,
budget, &subdesc_cnt,
&tx_pkts, &tx_bytes);
tx_done++;
break;
case CQE_TYPE_INVALID:
@ -704,9 +816,6 @@ loop:
}
processed_cqe++;
}
netdev_dbg(nic->netdev,
"%s CQ%d processed_cqe %d work_done %d budget %d\n",
__func__, cq_idx, processed_cqe, work_done, budget);
/* Ring doorbell to inform H/W to reuse processed CQEs */
nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR,
@ -716,13 +825,26 @@ loop:
goto loop;
done:
/* Update SQ's descriptor free count */
if (subdesc_cnt)
nicvf_put_sq_desc(sq, subdesc_cnt);
txq_idx = nicvf_netdev_qidx(nic, cq_idx);
/* Handle XDP TX queues */
if (nic->pnicvf->xdp_prog) {
if (txq_idx < nic->pnicvf->xdp_tx_queues) {
nicvf_xdp_sq_doorbell(nic, sq, cq_idx);
goto out;
}
nic = nic->pnicvf;
txq_idx -= nic->pnicvf->xdp_tx_queues;
}
/* Wakeup TXQ if its stopped earlier due to SQ full */
sq = &nic->qs->sq[cq_idx];
if (tx_done ||
(atomic_read(&sq->free_cnt) >= MIN_SQ_DESC_PER_PKT_XMIT)) {
netdev = nic->pnicvf->netdev;
txq = netdev_get_tx_queue(netdev,
nicvf_netdev_qidx(nic, cq_idx));
txq = netdev_get_tx_queue(netdev, txq_idx);
if (tx_pkts)
netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
@ -735,10 +857,11 @@ done:
if (netif_msg_tx_err(nic))
netdev_warn(netdev,
"%s: Transmit queue wakeup SQ%d\n",
netdev->name, cq_idx);
netdev->name, txq_idx);
}
}
out:
spin_unlock_bh(&cq->lock);
return work_done;
}
@ -1054,6 +1177,13 @@ static netdev_tx_t nicvf_xmit(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_OK;
}
/* In XDP case, initial HW tx queues are used for XDP,
* but stack's queue mapping starts at '0', so skip the
* Tx queues attached to Rx queues for XDP.
*/
if (nic->xdp_prog)
qid += nic->xdp_tx_queues;
snic = nic;
/* Get secondary Qset's SQ structure */
if (qid >= MAX_SND_QUEUES_PER_QS) {
@ -1531,6 +1661,114 @@ static int nicvf_set_features(struct net_device *netdev,
return 0;
}
static void nicvf_set_xdp_queues(struct nicvf *nic, bool bpf_attached)
{
u8 cq_count, txq_count;
/* Set XDP Tx queue count same as Rx queue count */
if (!bpf_attached)
nic->xdp_tx_queues = 0;
else
nic->xdp_tx_queues = nic->rx_queues;
/* If queue count > MAX_CMP_QUEUES_PER_QS, then additional qsets
* needs to be allocated, check how many.
*/
txq_count = nic->xdp_tx_queues + nic->tx_queues;
cq_count = max(nic->rx_queues, txq_count);
if (cq_count > MAX_CMP_QUEUES_PER_QS) {
nic->sqs_count = roundup(cq_count, MAX_CMP_QUEUES_PER_QS);
nic->sqs_count = (nic->sqs_count / MAX_CMP_QUEUES_PER_QS) - 1;
} else {
nic->sqs_count = 0;
}
/* Set primary Qset's resources */
nic->qs->rq_cnt = min_t(u8, nic->rx_queues, MAX_RCV_QUEUES_PER_QS);
nic->qs->sq_cnt = min_t(u8, txq_count, MAX_SND_QUEUES_PER_QS);
nic->qs->cq_cnt = max_t(u8, nic->qs->rq_cnt, nic->qs->sq_cnt);
/* Update stack */
nicvf_set_real_num_queues(nic->netdev, nic->tx_queues, nic->rx_queues);
}
static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog)
{
struct net_device *dev = nic->netdev;
bool if_up = netif_running(nic->netdev);
struct bpf_prog *old_prog;
bool bpf_attached = false;
/* For now just support only the usual MTU sized frames */
if (prog && (dev->mtu > 1500)) {
netdev_warn(dev, "Jumbo frames not yet supported with XDP, current MTU %d.\n",
dev->mtu);
return -EOPNOTSUPP;
}
/* ALL SQs attached to CQs i.e same as RQs, are treated as
* XDP Tx queues and more Tx queues are allocated for
* network stack to send pkts out.
*
* No of Tx queues are either same as Rx queues or whatever
* is left in max no of queues possible.
*/
if ((nic->rx_queues + nic->tx_queues) > nic->max_queues) {
netdev_warn(dev,
"Failed to attach BPF prog, RXQs + TXQs > Max %d\n",
nic->max_queues);
return -ENOMEM;
}
if (if_up)
nicvf_stop(nic->netdev);
old_prog = xchg(&nic->xdp_prog, prog);
/* Detach old prog, if any */
if (old_prog)
bpf_prog_put(old_prog);
if (nic->xdp_prog) {
/* Attach BPF program */
nic->xdp_prog = bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1);
if (!IS_ERR(nic->xdp_prog))
bpf_attached = true;
}
/* Calculate Tx queues needed for XDP and network stack */
nicvf_set_xdp_queues(nic, bpf_attached);
if (if_up) {
/* Reinitialize interface, clean slate */
nicvf_open(nic->netdev);
netif_trans_update(nic->netdev);
}
return 0;
}
static int nicvf_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
{
struct nicvf *nic = netdev_priv(netdev);
/* To avoid checks while retrieving buffer address from CQE_RX,
* do not support XDP for T88 pass1.x silicons which are anyway
* not in use widely.
*/
if (pass1_silicon(nic->pdev))
return -EOPNOTSUPP;
switch (xdp->command) {
case XDP_SETUP_PROG:
return nicvf_xdp_setup(nic, xdp->prog);
case XDP_QUERY_PROG:
xdp->prog_attached = !!nic->xdp_prog;
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops nicvf_netdev_ops = {
.ndo_open = nicvf_open,
.ndo_stop = nicvf_stop,
@ -1541,6 +1779,7 @@ static const struct net_device_ops nicvf_netdev_ops = {
.ndo_tx_timeout = nicvf_tx_timeout,
.ndo_fix_features = nicvf_fix_features,
.ndo_set_features = nicvf_set_features,
.ndo_xdp = nicvf_xdp,
};
static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

391
drivers/net/ethernet/cavium/thunder/nicvf_queues.c
View File

@ -19,16 +19,8 @@
#include "q_struct.h"
#include "nicvf_queues.h"
#define NICVF_PAGE_ORDER ((PAGE_SIZE <= 4096) ? PAGE_ALLOC_COSTLY_ORDER : 0)
static inline u64 nicvf_iova_to_phys(struct nicvf *nic, dma_addr_t dma_addr)
{
/* Translation is installed only when IOMMU is present */
if (nic->iommu_domain)
return iommu_iova_to_phys(nic->iommu_domain, dma_addr);
return dma_addr;
}
static inline void nicvf_sq_add_gather_subdesc(struct snd_queue *sq, int qentry,
int size, u64 data);
static void nicvf_get_page(struct nicvf *nic)
{
if (!nic->rb_pageref || !nic->rb_page)
@ -90,46 +82,152 @@ static void nicvf_free_q_desc_mem(struct nicvf *nic, struct q_desc_mem *dmem)
dmem->base = NULL;
}
/* Allocate buffer for packet reception
* HW returns memory address where packet is DMA'ed but not a pointer
* into RBDR ring, so save buffer address at the start of fragment and
* align the start address to a cache aligned address
*/
static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, gfp_t gfp,
u32 buf_len, u64 **rbuf)
{
int order = NICVF_PAGE_ORDER;
#define XDP_PAGE_REFCNT_REFILL 256
/* Check if request can be accomodated in previous allocated page */
if (nic->rb_page &&
((nic->rb_page_offset + buf_len) < (PAGE_SIZE << order))) {
/* Allocate a new page or recycle one if possible
*
* We cannot optimize dma mapping here, since
* 1. It's only one RBDR ring for 8 Rx queues.
* 2. CQE_RX gives address of the buffer where pkt has been DMA'ed
* and not idx into RBDR ring, so can't refer to saved info.
* 3. There are multiple receive buffers per page
*/
static inline struct pgcache *nicvf_alloc_page(struct nicvf *nic,
struct rbdr *rbdr, gfp_t gfp)
{
int ref_count;
struct page *page = NULL;
struct pgcache *pgcache, *next;
/* Check if page is already allocated */
pgcache = &rbdr->pgcache[rbdr->pgidx];
page = pgcache->page;
/* Check if page can be recycled */
if (page) {
ref_count = page_ref_count(page);
/* Check if this page has been used once i.e 'put_page'
* called after packet transmission i.e internal ref_count
* and page's ref_count are equal i.e page can be recycled.
*/
if (rbdr->is_xdp && (ref_count == pgcache->ref_count))
pgcache->ref_count--;
else
page = NULL;
/* In non-XDP mode, page's ref_count needs to be '1' for it
* to be recycled.
*/
if (!rbdr->is_xdp && (ref_count != 1))
page = NULL;
}
if (!page) {
page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN, 0);
if (!page)
return NULL;
this_cpu_inc(nic->pnicvf->drv_stats->page_alloc);
/* Check for space */
if (rbdr->pgalloc >= rbdr->pgcnt) {
/* Page can still be used */
nic->rb_page = page;
return NULL;
}
/* Save the page in page cache */
pgcache->page = page;
pgcache->dma_addr = 0;
pgcache->ref_count = 0;
rbdr->pgalloc++;
}
/* Take additional page references for recycling */
if (rbdr->is_xdp) {
/* Since there is single RBDR (i.e single core doing
* page recycling) per 8 Rx queues, in XDP mode adjusting
* page references atomically is the biggest bottleneck, so
* take bunch of references at a time.
*
* So here, below reference counts defer by '1'.
*/
if (!pgcache->ref_count) {
pgcache->ref_count = XDP_PAGE_REFCNT_REFILL;
page_ref_add(page, XDP_PAGE_REFCNT_REFILL);
}
} else {
/* In non-XDP case, single 64K page is divided across multiple
* receive buffers, so cost of recycling is less anyway.
* So we can do with just one extra reference.
*/
page_ref_add(page, 1);
}
rbdr->pgidx++;
rbdr->pgidx &= (rbdr->pgcnt - 1);
/* Prefetch refcount of next page in page cache */
next = &rbdr->pgcache[rbdr->pgidx];
page = next->page;
if (page)
prefetch(&page->_refcount);
return pgcache;
}
/* Allocate buffer for packet reception */
static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, struct rbdr *rbdr,
gfp_t gfp, u32 buf_len, u64 *rbuf)
{
struct pgcache *pgcache = NULL;
/* Check if request can be accomodated in previous allocated page.
* But in XDP mode only one buffer per page is permitted.
*/
if (!rbdr->is_xdp && nic->rb_page &&
((nic->rb_page_offset + buf_len) <= PAGE_SIZE)) {
nic->rb_pageref++;
goto ret;
}
nicvf_get_page(nic);
nic->rb_page = NULL;
/* Allocate a new page */
nic->rb_page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
order);
if (!nic->rb_page) {
/* Get new page, either recycled or new one */
pgcache = nicvf_alloc_page(nic, rbdr, gfp);
if (!pgcache && !nic->rb_page) {
this_cpu_inc(nic->pnicvf->drv_stats->rcv_buffer_alloc_failures);
return -ENOMEM;
}
nic->rb_page_offset = 0;
/* Reserve space for header modifications by BPF program */
if (rbdr->is_xdp)
buf_len += XDP_PACKET_HEADROOM;
/* Check if it's recycled */
if (pgcache)
nic->rb_page = pgcache->page;
ret:
/* HW will ensure data coherency, CPU sync not required */
*rbuf = (u64 *)((u64)dma_map_page_attrs(&nic->pdev->dev, nic->rb_page,
if (rbdr->is_xdp && pgcache && pgcache->dma_addr) {
*rbuf = pgcache->dma_addr;
} else {
/* HW will ensure data coherency, CPU sync not required */
*rbuf = (u64)dma_map_page_attrs(&nic->pdev->dev, nic->rb_page,
nic->rb_page_offset, buf_len,
DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC));
if (dma_mapping_error(&nic->pdev->dev, (dma_addr_t)*rbuf)) {
if (!nic->rb_page_offset)
__free_pages(nic->rb_page, order);
nic->rb_page = NULL;
return -ENOMEM;
DMA_ATTR_SKIP_CPU_SYNC);
if (dma_mapping_error(&nic->pdev->dev, (dma_addr_t)*rbuf)) {
if (!nic->rb_page_offset)
__free_pages(nic->rb_page, 0);
nic->rb_page = NULL;
return -ENOMEM;
}
if (pgcache)
pgcache->dma_addr = *rbuf + XDP_PACKET_HEADROOM;
nic->rb_page_offset += buf_len;
}
nic->rb_page_offset += buf_len;
return 0;
}
@ -159,7 +257,7 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
int ring_len, int buf_size)
{
int idx;
u64 *rbuf;
u64 rbuf;
struct rbdr_entry_t *desc;
int err;
@ -177,10 +275,34 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
rbdr->head = 0;
rbdr->tail = 0;
/* Initialize page recycling stuff.
*
* Can't use single buffer per page especially with 64K pages.
* On embedded platforms i.e 81xx/83xx available memory itself
* is low and minimum ring size of RBDR is 8K, that takes away
* lots of memory.
*
* But for XDP it has to be a single buffer per page.
*/
if (!nic->pnicvf->xdp_prog) {
rbdr->pgcnt = ring_len / (PAGE_SIZE / buf_size);
rbdr->is_xdp = false;
} else {
rbdr->pgcnt = ring_len;
rbdr->is_xdp = true;
}
rbdr->pgcnt = roundup_pow_of_two(rbdr->pgcnt);
rbdr->pgcache = kzalloc(sizeof(*rbdr->pgcache) *
rbdr->pgcnt, GFP_KERNEL);
if (!rbdr->pgcache)
return -ENOMEM;
rbdr->pgidx = 0;
rbdr->pgalloc = 0;
nic->rb_page = NULL;
for (idx = 0; idx < ring_len; idx++) {
err = nicvf_alloc_rcv_buffer(nic, GFP_KERNEL, RCV_FRAG_LEN,
&rbuf);
err = nicvf_alloc_rcv_buffer(nic, rbdr, GFP_KERNEL,
RCV_FRAG_LEN, &rbuf);
if (err) {
/* To free already allocated and mapped ones */
rbdr->tail = idx - 1;
@ -188,7 +310,7 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
}
desc = GET_RBDR_DESC(rbdr, idx);
desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN;
desc->buf_addr = rbuf & ~(NICVF_RCV_BUF_ALIGN_BYTES - 1);
}
nicvf_get_page(nic);
@ -201,6 +323,7 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
{
int head, tail;
u64 buf_addr, phys_addr;
struct pgcache *pgcache;
struct rbdr_entry_t *desc;
if (!rbdr)
@ -216,7 +339,7 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
/* Release page references */
while (head != tail) {
desc = GET_RBDR_DESC(rbdr, head);
buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN;
buf_addr = desc->buf_addr;
phys_addr = nicvf_iova_to_phys(nic, buf_addr);
dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN,
DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
@ -227,13 +350,31 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
}
/* Release buffer of tail desc */
desc = GET_RBDR_DESC(rbdr, tail);
buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN;
buf_addr = desc->buf_addr;
phys_addr = nicvf_iova_to_phys(nic, buf_addr);
dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN,
DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
if (phys_addr)
put_page(virt_to_page(phys_to_virt(phys_addr)));
/* Sync page cache info */
smp_rmb();
/* Release additional page references held for recycling */
head = 0;
while (head < rbdr->pgcnt) {
pgcache = &rbdr->pgcache[head];
if (pgcache->page && page_ref_count(pgcache->page) != 0) {
if (!rbdr->is_xdp) {
put_page(pgcache->page);
continue;
}
page_ref_sub(pgcache->page, pgcache->ref_count - 1);
put_page(pgcache->page);
}
head++;
}
/* Free RBDR ring */
nicvf_free_q_desc_mem(nic, &rbdr->dmem);
}
@ -248,7 +389,7 @@ static void nicvf_refill_rbdr(struct nicvf *nic, gfp_t gfp)
int refill_rb_cnt;
struct rbdr *rbdr;
struct rbdr_entry_t *desc;
u64 *rbuf;
u64 rbuf;
int new_rb = 0;
refill:
@ -269,17 +410,20 @@ refill:
else
refill_rb_cnt = qs->rbdr_len - qcount - 1;
/* Sync page cache info */
smp_rmb();
/* Start filling descs from tail */
tail = nicvf_queue_reg_read(nic, NIC_QSET_RBDR_0_1_TAIL, rbdr_idx) >> 3;
while (refill_rb_cnt) {
tail++;
tail &= (rbdr->dmem.q_len - 1);
if (nicvf_alloc_rcv_buffer(nic, gfp, RCV_FRAG_LEN, &rbuf))
if (nicvf_alloc_rcv_buffer(nic, rbdr, gfp, RCV_FRAG_LEN, &rbuf))
break;
desc = GET_RBDR_DESC(rbdr, tail);
desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN;
desc->buf_addr = rbuf & ~(NICVF_RCV_BUF_ALIGN_BYTES - 1);
refill_rb_cnt--;
new_rb++;
}
@ -362,7 +506,7 @@ static void nicvf_free_cmp_queue(struct nicvf *nic, struct cmp_queue *cq)
/* Initialize transmit queue */
static int nicvf_init_snd_queue(struct nicvf *nic,
struct snd_queue *sq, int q_len)
struct snd_queue *sq, int q_len, int qidx)
{
int err;
@ -375,17 +519,38 @@ static int nicvf_init_snd_queue(struct nicvf *nic,
sq->skbuff = kcalloc(q_len, sizeof(u64), GFP_KERNEL);
if (!sq->skbuff)
return -ENOMEM;
sq->head = 0;
sq->tail = 0;
atomic_set(&sq->free_cnt, q_len - 1);
sq->thresh = SND_QUEUE_THRESH;
/* Preallocate memory for TSO segment's header */
sq->tso_hdrs = dma_alloc_coherent(&nic->pdev->dev,
q_len * TSO_HEADER_SIZE,
&sq->tso_hdrs_phys, GFP_KERNEL);
if (!sq->tso_hdrs)
return -ENOMEM;
/* Check if this SQ is a XDP TX queue */
if (nic->sqs_mode)
qidx += ((nic->sqs_id + 1) * MAX_SND_QUEUES_PER_QS);
if (qidx < nic->pnicvf->xdp_tx_queues) {
/* Alloc memory to save page pointers for XDP_TX */
sq->xdp_page = kcalloc(q_len, sizeof(u64), GFP_KERNEL);
if (!sq->xdp_page)
return -ENOMEM;
sq->xdp_desc_cnt = 0;
sq->xdp_free_cnt = q_len - 1;
sq->is_xdp = true;
} else {
sq->xdp_page = NULL;
sq->xdp_desc_cnt = 0;
sq->xdp_free_cnt = 0;
sq->is_xdp = false;
atomic_set(&sq->free_cnt, q_len - 1);
/* Preallocate memory for TSO segment's header */
sq->tso_hdrs = dma_alloc_coherent(&nic->pdev->dev,
q_len * TSO_HEADER_SIZE,
&sq->tso_hdrs_phys,
GFP_KERNEL);
if (!sq->tso_hdrs)
return -ENOMEM;
}
return 0;
}
@ -411,6 +576,7 @@ void nicvf_unmap_sndq_buffers(struct nicvf *nic, struct snd_queue *sq,
static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
{
struct sk_buff *skb;
struct page *page;
struct sq_hdr_subdesc *hdr;
struct sq_hdr_subdesc *tso_sqe;
@ -428,8 +594,15 @@ static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
smp_rmb();
while (sq->head != sq->tail) {
skb = (struct sk_buff *)sq->skbuff[sq->head];
if (!skb)
if (!skb || !sq->xdp_page)
goto next;
page = (struct page *)sq->xdp_page[sq->head];
if (!page)
goto next;
else
put_page(page);
hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, sq->head);
/* Check for dummy descriptor used for HW TSO offload on 88xx */
if (hdr->dont_send) {
@ -442,12 +615,14 @@ static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
nicvf_unmap_sndq_buffers(nic, sq, sq->head,
hdr->subdesc_cnt);
}
dev_kfree_skb_any(skb);
if (skb)
dev_kfree_skb_any(skb);
next:
sq->head++;
sq->head &= (sq->dmem.q_len - 1);
}
kfree(sq->skbuff);
kfree(sq->xdp_page);
nicvf_free_q_desc_mem(nic, &sq->dmem);
}
@ -838,7 +1013,7 @@ static int nicvf_alloc_resources(struct nicvf *nic)
/* Alloc send queue */
for (qidx = 0; qidx < qs->sq_cnt; qidx++) {
if (nicvf_init_snd_queue(nic, &qs->sq[qidx], qs->sq_len))
if (nicvf_init_snd_queue(nic, &qs->sq[qidx], qs->sq_len, qidx))
goto alloc_fail;
}
@ -876,6 +1051,7 @@ int nicvf_set_qset_resources(struct nicvf *nic)
nic->rx_queues = qs->rq_cnt;
nic->tx_queues = qs->sq_cnt;
nic->xdp_tx_queues = 0;
return 0;
}
@ -940,7 +1116,10 @@ static inline int nicvf_get_sq_desc(struct snd_queue *sq, int desc_cnt)
int qentry;
qentry = sq->tail;
atomic_sub(desc_cnt, &sq->free_cnt);
if (!sq->is_xdp)
atomic_sub(desc_cnt, &sq->free_cnt);
else
sq->xdp_free_cnt -= desc_cnt;
sq->tail += desc_cnt;
sq->tail &= (sq->dmem.q_len - 1);
@ -958,7 +1137,10 @@ static inline void nicvf_rollback_sq_desc(struct snd_queue *sq,
/* Free descriptor back to SQ for future use */
void nicvf_put_sq_desc(struct snd_queue *sq, int desc_cnt)
{
atomic_add(desc_cnt, &sq->free_cnt);
if (!sq->is_xdp)
atomic_add(desc_cnt, &sq->free_cnt);
else
sq->xdp_free_cnt += desc_cnt;
sq->head += desc_cnt;
sq->head &= (sq->dmem.q_len - 1);
}
@ -1016,6 +1198,58 @@ void nicvf_sq_free_used_descs(struct net_device *netdev, struct snd_queue *sq,
}
}
/* XDP Transmit APIs */
void nicvf_xdp_sq_doorbell(struct nicvf *nic,
struct snd_queue *sq, int sq_num)
{
if (!sq->xdp_desc_cnt)
return;
/* make sure all memory stores are done before ringing doorbell */
wmb();
/* Inform HW to xmit all TSO segments */
nicvf_queue_reg_write(nic, NIC_QSET_SQ_0_7_DOOR,
sq_num, sq->xdp_desc_cnt);
sq->xdp_desc_cnt = 0;
}
static inline void
nicvf_xdp_sq_add_hdr_subdesc(struct snd_queue *sq, int qentry,
int subdesc_cnt, u64 data, int len)
{
struct sq_hdr_subdesc *hdr;
hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, qentry);
memset(hdr, 0, SND_QUEUE_DESC_SIZE);
hdr->subdesc_type = SQ_DESC_TYPE_HEADER;
hdr->subdesc_cnt = subdesc_cnt;
hdr->tot_len = len;
hdr->post_cqe = 1;
sq->xdp_page[qentry] = (u64)virt_to_page((void *)data);
}
int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq,
u64 bufaddr, u64 dma_addr, u16 len)
{
int subdesc_cnt = MIN_SQ_DESC_PER_PKT_XMIT;
int qentry;
if (subdesc_cnt > sq->xdp_free_cnt)
return 0;
qentry = nicvf_get_sq_desc(sq, subdesc_cnt);
nicvf_xdp_sq_add_hdr_subdesc(sq, qentry, subdesc_cnt - 1, bufaddr, len);
qentry = nicvf_get_nxt_sqentry(sq, qentry);
nicvf_sq_add_gather_subdesc(sq, qentry, len, dma_addr);
sq->xdp_desc_cnt += subdesc_cnt;
return 1;
}
/* Calculate no of SQ subdescriptors needed to transmit all
* segments of this TSO packet.
* Taken from 'Tilera network driver' with a minor modification.
@ -1374,8 +1608,33 @@ static inline unsigned frag_num(unsigned i)
#endif
}
static void nicvf_unmap_rcv_buffer(struct nicvf *nic, u64 dma_addr,
u64 buf_addr, bool xdp)
{
struct page *page = NULL;
int len = RCV_FRAG_LEN;
if (xdp) {
page = virt_to_page(phys_to_virt(buf_addr));
/* Check if it's a recycled page, if not
* unmap the DMA mapping.
*
* Recycled page holds an extra reference.
*/
if (page_ref_count(page) != 1)
return;
len += XDP_PACKET_HEADROOM;
/* Receive buffers in XDP mode are mapped from page start */
dma_addr &= PAGE_MASK;
}
dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, len,
DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
}
/* Returns SKB for a received packet */
struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic,
struct cqe_rx_t *cqe_rx, bool xdp)
{
int frag;
int payload_len = 0;
@ -1410,10 +1669,9 @@ struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
if (!frag) {
/* First fragment */
dma_unmap_page_attrs(&nic->pdev->dev,
*rb_ptrs - cqe_rx->align_pad,
RCV_FRAG_LEN, DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
nicvf_unmap_rcv_buffer(nic,
*rb_ptrs - cqe_rx->align_pad,
phys_addr, xdp);
skb = nicvf_rb_ptr_to_skb(nic,
phys_addr - cqe_rx->align_pad,
payload_len);
@ -1423,9 +1681,7 @@ struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
skb_put(skb, payload_len);
} else {
/* Add fragments */
dma_unmap_page_attrs(&nic->pdev->dev, *rb_ptrs,
RCV_FRAG_LEN, DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
nicvf_unmap_rcv_buffer(nic, *rb_ptrs, phys_addr, xdp);
page = virt_to_page(phys_to_virt(phys_addr));
offset = phys_to_virt(phys_addr) - page_address(page);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
@ -1555,9 +1811,6 @@ void nicvf_update_sq_stats(struct nicvf *nic, int sq_idx)
/* Check for errors in the receive cmp.queue entry */
int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
{
if (!cqe_rx->err_level && !cqe_rx->err_opcode)
return 0;
if (netif_msg_rx_err(nic))
netdev_err(nic->netdev,
"%s: RX error CQE err_level 0x%x err_opcode 0x%x\n",
@ -1646,8 +1899,6 @@ int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
int nicvf_check_cqe_tx_errs(struct nicvf *nic, struct cqe_send_t *cqe_tx)
{
switch (cqe_tx->send_status) {
case CQ_TX_ERROP_GOOD:
return 0;
case CQ_TX_ERROP_DESC_FAULT:
this_cpu_inc(nic->drv_stats->tx_desc_fault);
break;

32
drivers/net/ethernet/cavium/thunder/nicvf_queues.h
View File

@ -10,6 +10,7 @@
#define NICVF_QUEUES_H
#include <linux/netdevice.h>
#include <linux/iommu.h>
#include "q_struct.h"
#define MAX_QUEUE_SET 128
@ -213,6 +214,12 @@ struct q_desc_mem {
void *unalign_base;
};
struct pgcache {
struct page *page;
int ref_count;
u64 dma_addr;
};
struct rbdr {
bool enable;
u32 dma_size;
@ -222,6 +229,13 @@ struct rbdr {
u32 head;
u32 tail;
struct q_desc_mem dmem;
bool is_xdp;
/* For page recycling */
int pgidx;
int pgcnt;
int pgalloc;
struct pgcache *pgcache;
} ____cacheline_aligned_in_smp;
struct rcv_queue {
@ -258,6 +272,10 @@ struct snd_queue {
u32 tail;
u64 *skbuff;
void *desc;
u64 *xdp_page;
u16 xdp_desc_cnt;
u16 xdp_free_cnt;
bool is_xdp;
#define TSO_HEADER_SIZE 128
/* For TSO segment's header */
@ -301,6 +319,14 @@ struct queue_set {
#define CQ_ERR_MASK (CQ_WR_FULL | CQ_WR_DISABLE | CQ_WR_FAULT)
static inline u64 nicvf_iova_to_phys(struct nicvf *nic, dma_addr_t dma_addr)
{
/* Translation is installed only when IOMMU is present */
if (nic->iommu_domain)
return iommu_iova_to_phys(nic->iommu_domain, dma_addr);
return dma_addr;
}
void nicvf_unmap_sndq_buffers(struct nicvf *nic, struct snd_queue *sq,
int hdr_sqe, u8 subdesc_cnt);
void nicvf_config_vlan_stripping(struct nicvf *nic,
@ -318,8 +344,12 @@ void nicvf_sq_free_used_descs(struct net_device *netdev,
struct snd_queue *sq, int qidx);
int nicvf_sq_append_skb(struct nicvf *nic, struct snd_queue *sq,
struct sk_buff *skb, u8 sq_num);
int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq,
u64 bufaddr, u64 dma_addr, u16 len);
void nicvf_xdp_sq_doorbell(struct nicvf *nic, struct snd_queue *sq, int sq_num);
struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx);
struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic,
struct cqe_rx_t *cqe_rx, bool xdp);
void nicvf_rbdr_task(unsigned long data);
void nicvf_rbdr_work(struct work_struct *work);

10
drivers/net/ethernet/cavium/thunder/q_struct.h
View File

@ -359,15 +359,7 @@ union cq_desc_t {
};
struct rbdr_entry_t {
#if defined(__BIG_ENDIAN_BITFIELD)
u64 rsvd0:15;
u64 buf_addr:42;
u64 cache_align:7;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u64 cache_align:7;
u64 buf_addr:42;
u64 rsvd0:15;
#endif
u64 buf_addr;
};
/* TCP reassembly context */