octeontx2-pf: Add basic ethtool support

This patch adds ethtool support for
 - Driver stats, Tx/Rx perqueue and CGX LMAC stats
 - Set/show Rx/Tx queue count
 - Set/show Rx/Tx ring sizes
 - Set/show IRQ coalescing parameters

Signed-off-by: Christina Jacob <cjacob@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christina Jacob 2020-01-27 18:35:28 +05:30 committed by David S. Miller
parent e239d0c78c
commit d45d897984
6 changed files with 525 additions and 4 deletions

View File

@ -5,6 +5,6 @@
obj-$(CONFIG_OCTEONTX2_PF) += octeontx2_nicpf.o
octeontx2_nicpf-y := otx2_pf.o otx2_common.o otx2_txrx.o
octeontx2_nicpf-y := otx2_pf.o otx2_common.o otx2_txrx.o otx2_ethtool.o
ccflags-y += -I$(srctree)/drivers/net/ethernet/marvell/octeontx2/af

View File

@ -16,6 +16,72 @@
#include "otx2_common.h"
#include "otx2_struct.h"
static void otx2_nix_rq_op_stats(struct queue_stats *stats,
struct otx2_nic *pfvf, int qidx)
{
u64 incr = (u64)qidx << 32;
u64 *ptr;
ptr = (u64 *)otx2_get_regaddr(pfvf, NIX_LF_RQ_OP_OCTS);
stats->bytes = otx2_atomic64_add(incr, ptr);
ptr = (u64 *)otx2_get_regaddr(pfvf, NIX_LF_RQ_OP_PKTS);
stats->pkts = otx2_atomic64_add(incr, ptr);
}
static void otx2_nix_sq_op_stats(struct queue_stats *stats,
struct otx2_nic *pfvf, int qidx)
{
u64 incr = (u64)qidx << 32;
u64 *ptr;
ptr = (u64 *)otx2_get_regaddr(pfvf, NIX_LF_SQ_OP_OCTS);
stats->bytes = otx2_atomic64_add(incr, ptr);
ptr = (u64 *)otx2_get_regaddr(pfvf, NIX_LF_SQ_OP_PKTS);
stats->pkts = otx2_atomic64_add(incr, ptr);
}
void otx2_update_lmac_stats(struct otx2_nic *pfvf)
{
struct msg_req *req;
if (!netif_running(pfvf->netdev))
return;
otx2_mbox_lock(&pfvf->mbox);
req = otx2_mbox_alloc_msg_cgx_stats(&pfvf->mbox);
if (!req) {
otx2_mbox_unlock(&pfvf->mbox);
return;
}
otx2_sync_mbox_msg(&pfvf->mbox);
otx2_mbox_unlock(&pfvf->mbox);
}
int otx2_update_rq_stats(struct otx2_nic *pfvf, int qidx)
{
struct otx2_rcv_queue *rq = &pfvf->qset.rq[qidx];
if (!pfvf->qset.rq)
return 0;
otx2_nix_rq_op_stats(&rq->stats, pfvf, qidx);
return 1;
}
int otx2_update_sq_stats(struct otx2_nic *pfvf, int qidx)
{
struct otx2_snd_queue *sq = &pfvf->qset.sq[qidx];
if (!pfvf->qset.sq)
return 0;
otx2_nix_sq_op_stats(&sq->stats, pfvf, qidx);
return 1;
}
void otx2_get_dev_stats(struct otx2_nic *pfvf)
{
struct otx2_dev_stats *dev_stats = &pfvf->hw.dev_stats;
@ -590,6 +656,9 @@ static int otx2_sq_init(struct otx2_nic *pfvf, u16 qidx, u16 sqb_aura)
sq->lmt_addr = (__force u64 *)(pfvf->reg_base + LMT_LF_LMTLINEX(qidx));
sq->io_addr = (__force u64)otx2_get_regaddr(pfvf, NIX_LF_OP_SENDX(0));
sq->stats.bytes = 0;
sq->stats.pkts = 0;
/* Get memory to put this msg */
aq = otx2_mbox_alloc_msg_nix_aq_enq(&pfvf->mbox);
if (!aq)
@ -1238,6 +1307,18 @@ void otx2_ctx_disable(struct mbox *mbox, int type, bool npa)
otx2_mbox_unlock(mbox);
}
/* Mbox message handlers */
void mbox_handler_cgx_stats(struct otx2_nic *pfvf,
struct cgx_stats_rsp *rsp)
{
int id;
for (id = 0; id < CGX_RX_STATS_COUNT; id++)
pfvf->hw.cgx_rx_stats[id] = rsp->rx_stats[id];
for (id = 0; id < CGX_TX_STATS_COUNT; id++)
pfvf->hw.cgx_tx_stats[id] = rsp->tx_stats[id];
}
void mbox_handler_nix_txsch_alloc(struct otx2_nic *pf,
struct nix_txsch_alloc_rsp *rsp)
{
@ -1250,7 +1331,6 @@ void mbox_handler_nix_txsch_alloc(struct otx2_nic *pf,
rsp->schq_list[lvl][schq];
}
/* Mbox message handlers */
void mbox_handler_npa_lf_alloc(struct otx2_nic *pfvf,
struct npa_lf_alloc_rsp *rsp)
{

View File

@ -187,6 +187,8 @@ struct otx2_hw {
/* Stats */
struct otx2_dev_stats dev_stats;
struct otx2_drv_stats drv_stats;
u64 cgx_rx_stats[CGX_RX_STATS_COUNT];
u64 cgx_tx_stats[CGX_TX_STATS_COUNT];
};
struct refill_work {
@ -588,12 +590,20 @@ void mbox_handler_nix_lf_alloc(struct otx2_nic *pfvf,
struct nix_lf_alloc_rsp *rsp);
void mbox_handler_nix_txsch_alloc(struct otx2_nic *pf,
struct nix_txsch_alloc_rsp *rsp);
void mbox_handler_cgx_stats(struct otx2_nic *pfvf,
struct cgx_stats_rsp *rsp);
/* Device stats APIs */
void otx2_get_dev_stats(struct otx2_nic *pfvf);
void otx2_get_stats64(struct net_device *netdev,
struct rtnl_link_stats64 *stats);
void otx2_update_lmac_stats(struct otx2_nic *pfvf);
int otx2_update_rq_stats(struct otx2_nic *pfvf, int qidx);
int otx2_update_sq_stats(struct otx2_nic *pfvf, int qidx);
void otx2_set_ethtool_ops(struct net_device *netdev);
int otx2_open(struct net_device *netdev);
int otx2_stop(struct net_device *netdev);
int otx2_set_real_num_queues(struct net_device *netdev,
int tx_queues, int rx_queues);
#endif /* OTX2_COMMON_H */

View File

@ -0,0 +1,408 @@
// SPDX-License-Identifier: GPL-2.0
/* Marvell OcteonTx2 RVU Ethernet driver
*
* Copyright (C) 2020 Marvell International Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/pci.h>
#include <linux/ethtool.h>
#include <linux/stddef.h>
#include <linux/etherdevice.h>
#include <linux/log2.h>
#include "otx2_common.h"
#define DRV_NAME "octeontx2-nicpf"
struct otx2_stat {
char name[ETH_GSTRING_LEN];
unsigned int index;
};
/* HW device stats */
#define OTX2_DEV_STAT(stat) { \
.name = #stat, \
.index = offsetof(struct otx2_dev_stats, stat) / sizeof(u64), \
}
static const struct otx2_stat otx2_dev_stats[] = {
OTX2_DEV_STAT(rx_ucast_frames),
OTX2_DEV_STAT(rx_bcast_frames),
OTX2_DEV_STAT(rx_mcast_frames),
OTX2_DEV_STAT(tx_ucast_frames),
OTX2_DEV_STAT(tx_bcast_frames),
OTX2_DEV_STAT(tx_mcast_frames),
};
/* Driver level stats */
#define OTX2_DRV_STAT(stat) { \
.name = #stat, \
.index = offsetof(struct otx2_drv_stats, stat) / sizeof(atomic_t), \
}
static const struct otx2_stat otx2_drv_stats[] = {
OTX2_DRV_STAT(rx_fcs_errs),
OTX2_DRV_STAT(rx_oversize_errs),
OTX2_DRV_STAT(rx_undersize_errs),
OTX2_DRV_STAT(rx_csum_errs),
OTX2_DRV_STAT(rx_len_errs),
OTX2_DRV_STAT(rx_other_errs),
};
static const struct otx2_stat otx2_queue_stats[] = {
{ "bytes", 0 },
{ "frames", 1 },
};
static const unsigned int otx2_n_dev_stats = ARRAY_SIZE(otx2_dev_stats);
static const unsigned int otx2_n_drv_stats = ARRAY_SIZE(otx2_drv_stats);
static const unsigned int otx2_n_queue_stats = ARRAY_SIZE(otx2_queue_stats);
static void otx2_dev_open(struct net_device *netdev)
{
otx2_open(netdev);
}
static void otx2_dev_stop(struct net_device *netdev)
{
otx2_stop(netdev);
}
static void otx2_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *info)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
strlcpy(info->bus_info, pci_name(pfvf->pdev), sizeof(info->bus_info));
}
static void otx2_get_qset_strings(struct otx2_nic *pfvf, u8 **data, int qset)
{
int start_qidx = qset * pfvf->hw.rx_queues;
int qidx, stats;
for (qidx = 0; qidx < pfvf->hw.rx_queues; qidx++) {
for (stats = 0; stats < otx2_n_queue_stats; stats++) {
sprintf(*data, "rxq%d: %s", qidx + start_qidx,
otx2_queue_stats[stats].name);
*data += ETH_GSTRING_LEN;
}
}
for (qidx = 0; qidx < pfvf->hw.tx_queues; qidx++) {
for (stats = 0; stats < otx2_n_queue_stats; stats++) {
sprintf(*data, "txq%d: %s", qidx + start_qidx,
otx2_queue_stats[stats].name);
*data += ETH_GSTRING_LEN;
}
}
}
static void otx2_get_strings(struct net_device *netdev, u32 sset, u8 *data)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
int stats;
if (sset != ETH_SS_STATS)
return;
for (stats = 0; stats < otx2_n_dev_stats; stats++) {
memcpy(data, otx2_dev_stats[stats].name, ETH_GSTRING_LEN);
data += ETH_GSTRING_LEN;
}
for (stats = 0; stats < otx2_n_drv_stats; stats++) {
memcpy(data, otx2_drv_stats[stats].name, ETH_GSTRING_LEN);
data += ETH_GSTRING_LEN;
}
otx2_get_qset_strings(pfvf, &data, 0);
for (stats = 0; stats < CGX_RX_STATS_COUNT; stats++) {
sprintf(data, "cgx_rxstat%d: ", stats);
data += ETH_GSTRING_LEN;
}
for (stats = 0; stats < CGX_TX_STATS_COUNT; stats++) {
sprintf(data, "cgx_txstat%d: ", stats);
data += ETH_GSTRING_LEN;
}
strcpy(data, "reset_count");
data += ETH_GSTRING_LEN;
}
static void otx2_get_qset_stats(struct otx2_nic *pfvf,
struct ethtool_stats *stats, u64 **data)
{
int stat, qidx;
if (!pfvf)
return;
for (qidx = 0; qidx < pfvf->hw.rx_queues; qidx++) {
if (!otx2_update_rq_stats(pfvf, qidx)) {
for (stat = 0; stat < otx2_n_queue_stats; stat++)
*((*data)++) = 0;
continue;
}
for (stat = 0; stat < otx2_n_queue_stats; stat++)
*((*data)++) = ((u64 *)&pfvf->qset.rq[qidx].stats)
[otx2_queue_stats[stat].index];
}
for (qidx = 0; qidx < pfvf->hw.tx_queues; qidx++) {
if (!otx2_update_sq_stats(pfvf, qidx)) {
for (stat = 0; stat < otx2_n_queue_stats; stat++)
*((*data)++) = 0;
continue;
}
for (stat = 0; stat < otx2_n_queue_stats; stat++)
*((*data)++) = ((u64 *)&pfvf->qset.sq[qidx].stats)
[otx2_queue_stats[stat].index];
}
}
/* Get device and per queue statistics */
static void otx2_get_ethtool_stats(struct net_device *netdev,
struct ethtool_stats *stats, u64 *data)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
int stat;
otx2_get_dev_stats(pfvf);
for (stat = 0; stat < otx2_n_dev_stats; stat++)
*(data++) = ((u64 *)&pfvf->hw.dev_stats)
[otx2_dev_stats[stat].index];
for (stat = 0; stat < otx2_n_drv_stats; stat++)
*(data++) = atomic_read(&((atomic_t *)&pfvf->hw.drv_stats)
[otx2_drv_stats[stat].index]);
otx2_get_qset_stats(pfvf, stats, &data);
otx2_update_lmac_stats(pfvf);
for (stat = 0; stat < CGX_RX_STATS_COUNT; stat++)
*(data++) = pfvf->hw.cgx_rx_stats[stat];
for (stat = 0; stat < CGX_TX_STATS_COUNT; stat++)
*(data++) = pfvf->hw.cgx_tx_stats[stat];
*(data++) = pfvf->reset_count;
}
static int otx2_get_sset_count(struct net_device *netdev, int sset)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
int qstats_count;
if (sset != ETH_SS_STATS)
return -EINVAL;
qstats_count = otx2_n_queue_stats *
(pfvf->hw.rx_queues + pfvf->hw.tx_queues);
return otx2_n_dev_stats + otx2_n_drv_stats + qstats_count +
CGX_RX_STATS_COUNT + CGX_TX_STATS_COUNT + 1;
}
/* Get no of queues device supports and current queue count */
static void otx2_get_channels(struct net_device *dev,
struct ethtool_channels *channel)
{
struct otx2_nic *pfvf = netdev_priv(dev);
channel->max_rx = pfvf->hw.max_queues;
channel->max_tx = pfvf->hw.max_queues;
channel->rx_count = pfvf->hw.rx_queues;
channel->tx_count = pfvf->hw.tx_queues;
}
/* Set no of Tx, Rx queues to be used */
static int otx2_set_channels(struct net_device *dev,
struct ethtool_channels *channel)
{
struct otx2_nic *pfvf = netdev_priv(dev);
bool if_up = netif_running(dev);
int err = 0;
if (!channel->rx_count || !channel->tx_count)
return -EINVAL;
if (if_up)
otx2_dev_stop(dev);
err = otx2_set_real_num_queues(dev, channel->tx_count,
channel->rx_count);
if (err)
goto fail;
pfvf->hw.rx_queues = channel->rx_count;
pfvf->hw.tx_queues = channel->tx_count;
pfvf->qset.cq_cnt = pfvf->hw.tx_queues + pfvf->hw.rx_queues;
fail:
if (if_up)
otx2_dev_open(dev);
netdev_info(dev, "Setting num Tx rings to %d, Rx rings to %d success\n",
pfvf->hw.tx_queues, pfvf->hw.rx_queues);
return err;
}
static void otx2_get_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
struct otx2_qset *qs = &pfvf->qset;
ring->rx_max_pending = Q_COUNT(Q_SIZE_MAX);
ring->rx_pending = qs->rqe_cnt ? qs->rqe_cnt : Q_COUNT(Q_SIZE_256);
ring->tx_max_pending = Q_COUNT(Q_SIZE_MAX);
ring->tx_pending = qs->sqe_cnt ? qs->sqe_cnt : Q_COUNT(Q_SIZE_4K);
}
static int otx2_set_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
bool if_up = netif_running(netdev);
struct otx2_qset *qs = &pfvf->qset;
u32 rx_count, tx_count;
if (ring->rx_mini_pending || ring->rx_jumbo_pending)
return -EINVAL;
/* Permitted lengths are 16 64 256 1K 4K 16K 64K 256K 1M */
rx_count = ring->rx_pending;
/* On some silicon variants a skid or reserved CQEs are
* needed to avoid CQ overflow.
*/
if (rx_count < pfvf->hw.rq_skid)
rx_count = pfvf->hw.rq_skid;
rx_count = Q_COUNT(Q_SIZE(rx_count, 3));
/* Due pipelining impact minimum 2000 unused SQ CQE's
* need to be maintained to avoid CQ overflow, hence the
* minimum 4K size.
*/
tx_count = clamp_t(u32, ring->tx_pending,
Q_COUNT(Q_SIZE_4K), Q_COUNT(Q_SIZE_MAX));
tx_count = Q_COUNT(Q_SIZE(tx_count, 3));
if (tx_count == qs->sqe_cnt && rx_count == qs->rqe_cnt)
return 0;
if (if_up)
otx2_dev_stop(netdev);
/* Assigned to the nearest possible exponent. */
qs->sqe_cnt = tx_count;
qs->rqe_cnt = rx_count;
if (if_up)
otx2_dev_open(netdev);
return 0;
}
static int otx2_get_coalesce(struct net_device *netdev,
struct ethtool_coalesce *cmd)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
struct otx2_hw *hw = &pfvf->hw;
cmd->rx_coalesce_usecs = hw->cq_time_wait;
cmd->rx_max_coalesced_frames = hw->cq_ecount_wait;
cmd->tx_coalesce_usecs = hw->cq_time_wait;
cmd->tx_max_coalesced_frames = hw->cq_ecount_wait;
return 0;
}
static int otx2_set_coalesce(struct net_device *netdev,
struct ethtool_coalesce *ec)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
struct otx2_hw *hw = &pfvf->hw;
int qidx;
if (ec->use_adaptive_rx_coalesce || ec->use_adaptive_tx_coalesce ||
ec->rx_coalesce_usecs_irq || ec->rx_max_coalesced_frames_irq ||
ec->tx_coalesce_usecs_irq || ec->tx_max_coalesced_frames_irq ||
ec->stats_block_coalesce_usecs || ec->pkt_rate_low ||
ec->rx_coalesce_usecs_low || ec->rx_max_coalesced_frames_low ||
ec->tx_coalesce_usecs_low || ec->tx_max_coalesced_frames_low ||
ec->pkt_rate_high || ec->rx_coalesce_usecs_high ||
ec->rx_max_coalesced_frames_high || ec->tx_coalesce_usecs_high ||
ec->tx_max_coalesced_frames_high || ec->rate_sample_interval)
return -EOPNOTSUPP;
if (!ec->rx_max_coalesced_frames || !ec->tx_max_coalesced_frames)
return 0;
/* 'cq_time_wait' is 8bit and is in multiple of 100ns,
* so clamp the user given value to the range of 1 to 25usec.
*/
ec->rx_coalesce_usecs = clamp_t(u32, ec->rx_coalesce_usecs,
1, CQ_TIMER_THRESH_MAX);
ec->tx_coalesce_usecs = clamp_t(u32, ec->tx_coalesce_usecs,
1, CQ_TIMER_THRESH_MAX);
/* Rx and Tx are mapped to same CQ, check which one
* is changed, if both then choose the min.
*/
if (hw->cq_time_wait == ec->rx_coalesce_usecs)
hw->cq_time_wait = ec->tx_coalesce_usecs;
else if (hw->cq_time_wait == ec->tx_coalesce_usecs)
hw->cq_time_wait = ec->rx_coalesce_usecs;
else
hw->cq_time_wait = min_t(u8, ec->rx_coalesce_usecs,
ec->tx_coalesce_usecs);
/* Max ecount_wait supported is 16bit,
* so clamp the user given value to the range of 1 to 64k.
*/
ec->rx_max_coalesced_frames = clamp_t(u32, ec->rx_max_coalesced_frames,
1, U16_MAX);
ec->tx_max_coalesced_frames = clamp_t(u32, ec->tx_max_coalesced_frames,
1, U16_MAX);
/* Rx and Tx are mapped to same CQ, check which one
* is changed, if both then choose the min.
*/
if (hw->cq_ecount_wait == ec->rx_max_coalesced_frames)
hw->cq_ecount_wait = ec->tx_max_coalesced_frames;
else if (hw->cq_ecount_wait == ec->tx_max_coalesced_frames)
hw->cq_ecount_wait = ec->rx_max_coalesced_frames;
else
hw->cq_ecount_wait = min_t(u16, ec->rx_max_coalesced_frames,
ec->tx_max_coalesced_frames);
if (netif_running(netdev)) {
for (qidx = 0; qidx < pfvf->hw.cint_cnt; qidx++)
otx2_config_irq_coalescing(pfvf, qidx);
}
return 0;
}
static const struct ethtool_ops otx2_ethtool_ops = {
.get_drvinfo = otx2_get_drvinfo,
.get_strings = otx2_get_strings,
.get_ethtool_stats = otx2_get_ethtool_stats,
.get_sset_count = otx2_get_sset_count,
.set_channels = otx2_set_channels,
.get_channels = otx2_get_channels,
.get_ringparam = otx2_get_ringparam,
.set_ringparam = otx2_set_ringparam,
.get_coalesce = otx2_get_coalesce,
.set_coalesce = otx2_set_coalesce,
};
void otx2_set_ethtool_ops(struct net_device *netdev)
{
netdev->ethtool_ops = &otx2_ethtool_ops;
}

View File

@ -148,6 +148,9 @@ static void otx2_process_pfaf_mbox_msg(struct otx2_nic *pf,
mbox_handler_nix_txsch_alloc(pf,
(struct nix_txsch_alloc_rsp *)msg);
break;
case MBOX_MSG_CGX_STATS:
mbox_handler_cgx_stats(pf, (struct cgx_stats_rsp *)msg);
break;
default:
if (msg->rc)
dev_err(pf->dev,
@ -459,8 +462,8 @@ static int otx2_cgx_config_loopback(struct otx2_nic *pf, bool enable)
return err;
}
static int otx2_set_real_num_queues(struct net_device *netdev,
int tx_queues, int rx_queues)
int otx2_set_real_num_queues(struct net_device *netdev,
int tx_queues, int rx_queues)
{
int err;
@ -812,6 +815,11 @@ int otx2_open(struct net_device *netdev)
if (!qset->sq)
goto err_free_mem;
qset->rq = kcalloc(pf->hw.rx_queues,
sizeof(struct otx2_rcv_queue), GFP_KERNEL);
if (!qset->rq)
goto err_free_mem;
err = otx2_init_hw_resources(pf);
if (err)
goto err_free_mem;
@ -917,6 +925,7 @@ int otx2_open(struct net_device *netdev)
err_free_mem:
kfree(qset->sq);
kfree(qset->cq);
kfree(qset->rq);
kfree(qset->napi);
return err;
}
@ -973,6 +982,7 @@ int otx2_stop(struct net_device *netdev)
kfree(qset->sq);
kfree(qset->cq);
kfree(qset->rq);
kfree(qset->napi);
/* Do not clear RQ/SQ ringsize settings */
memset((void *)qset + offsetof(struct otx2_qset, sqe_cnt), 0,
@ -1268,6 +1278,8 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto err_detach_rsrc;
}
otx2_set_ethtool_ops(netdev);
/* Enable link notifications */
otx2_cgx_config_linkevents(pf, true);

View File

@ -60,6 +60,15 @@
*/
#define CQ_QCOUNT_DEFAULT 1
struct queue_stats {
u64 bytes;
u64 pkts;
};
struct otx2_rcv_queue {
struct queue_stats stats;
};
struct sg_list {
u16 num_segs;
u64 skb;
@ -82,6 +91,7 @@ struct otx2_snd_queue {
struct qmem *sqe;
struct qmem *tso_hdrs;
struct sg_list *sg;
struct queue_stats stats;
u16 sqb_count;
u64 *sqb_ptrs;
} ____cacheline_aligned_in_smp;
@ -134,6 +144,7 @@ struct otx2_qset {
struct otx2_cq_poll *napi;
struct otx2_cq_queue *cq;
struct otx2_snd_queue *sq;
struct otx2_rcv_queue *rq;
};
/* Translate IOVA to physical address */