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ionic: Add Tx and Rx handling

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Add both the Tx and Rx queue setup and handling.  The related
stats display comes later.  Instead of using the generic napi
routines used by the slow-path commands, the Tx and Rx paths
are simplified and inlined in one file in order to get better
compiler optimizations.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2019-09-03 15:28:17 -07:00 committed by David S. Miller
parent 4d03e00a21
commit 0f3154e6bc
5 changed files with 1408 additions and 1 deletions
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3
drivers/net/ethernet/pensando/ionic/Makefile
View File

@ -4,4 +4,5 @@
obj-$(CONFIG_IONIC) := ionic.o
ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o
ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o \
ionic_txrx.o

414
drivers/net/ethernet/pensando/ionic/ionic_lif.c
View File

@ -10,6 +10,7 @@
#include "ionic.h"
#include "ionic_bus.h"
#include "ionic_lif.h"
#include "ionic_txrx.h"
#include "ionic_ethtool.h"
#include "ionic_debugfs.h"
@ -80,11 +81,17 @@ static void ionic_link_status_check(struct ionic_lif *lif)
netdev_info(netdev, "Link up - %d Gbps\n",
le32_to_cpu(lif->info->status.link_speed) / 1000);
if (test_bit(IONIC_LIF_UP, lif->state)) {
netif_tx_wake_all_queues(lif->netdev);
netif_carrier_on(netdev);
}
} else {
netdev_info(netdev, "Link down\n");
/* carrier off first to avoid watchdog timeout */
netif_carrier_off(netdev);
if (test_bit(IONIC_LIF_UP, lif->state))
netif_tx_stop_all_queues(netdev);
}
link_out:
@ -163,6 +170,77 @@ static void ionic_intr_free(struct ionic_lif *lif, int index)
clear_bit(index, lif->ionic->intrs);
}
static int ionic_qcq_enable(struct ionic_qcq *qcq)
{
struct ionic_queue *q = &qcq->q;
struct ionic_lif *lif = q->lif;
struct ionic_dev *idev;
struct device *dev;
struct ionic_admin_ctx ctx = {
.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
.cmd.q_control = {
.opcode = IONIC_CMD_Q_CONTROL,
.lif_index = cpu_to_le16(lif->index),
.type = q->type,
.index = cpu_to_le32(q->index),
.oper = IONIC_Q_ENABLE,
},
};
idev = &lif->ionic->idev;
dev = lif->ionic->dev;
dev_dbg(dev, "q_enable.index %d q_enable.qtype %d\n",
ctx.cmd.q_control.index, ctx.cmd.q_control.type);
if (qcq->flags & IONIC_QCQ_F_INTR) {
irq_set_affinity_hint(qcq->intr.vector,
&qcq->intr.affinity_mask);
napi_enable(&qcq->napi);
ionic_intr_clean(idev->intr_ctrl, qcq->intr.index);
ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
IONIC_INTR_MASK_CLEAR);
}
return ionic_adminq_post_wait(lif, &ctx);
}
static int ionic_qcq_disable(struct ionic_qcq *qcq)
{
struct ionic_queue *q = &qcq->q;
struct ionic_lif *lif = q->lif;
struct ionic_dev *idev;
struct device *dev;
struct ionic_admin_ctx ctx = {
.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
.cmd.q_control = {
.opcode = IONIC_CMD_Q_CONTROL,
.lif_index = cpu_to_le16(lif->index),
.type = q->type,
.index = cpu_to_le32(q->index),
.oper = IONIC_Q_DISABLE,
},
};
idev = &lif->ionic->idev;
dev = lif->ionic->dev;
dev_dbg(dev, "q_disable.index %d q_disable.qtype %d\n",
ctx.cmd.q_control.index, ctx.cmd.q_control.type);
if (qcq->flags & IONIC_QCQ_F_INTR) {
ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
IONIC_INTR_MASK_SET);
synchronize_irq(qcq->intr.vector);
irq_set_affinity_hint(qcq->intr.vector, NULL);
napi_disable(&qcq->napi);
}
return ionic_adminq_post_wait(lif, &ctx);
}
static void ionic_lif_qcq_deinit(struct ionic_lif *lif, struct ionic_qcq *qcq)
{
struct ionic_dev *idev = &lif->ionic->idev;
@ -209,6 +287,9 @@ static void ionic_qcq_free(struct ionic_lif *lif, struct ionic_qcq *qcq)
static void ionic_qcqs_free(struct ionic_lif *lif)
{
struct device *dev = lif->ionic->dev;
unsigned int i;
if (lif->notifyqcq) {
ionic_qcq_free(lif, lif->notifyqcq);
lif->notifyqcq = NULL;
@ -218,6 +299,20 @@ static void ionic_qcqs_free(struct ionic_lif *lif)
ionic_qcq_free(lif, lif->adminqcq);
lif->adminqcq = NULL;
}
for (i = 0; i < lif->nxqs; i++)
if (lif->rxqcqs[i].stats)
devm_kfree(dev, lif->rxqcqs[i].stats);
devm_kfree(dev, lif->rxqcqs);
lif->rxqcqs = NULL;
for (i = 0; i < lif->nxqs; i++)
if (lif->txqcqs[i].stats)
devm_kfree(dev, lif->txqcqs[i].stats);
devm_kfree(dev, lif->txqcqs);
lif->txqcqs = NULL;
}
static void ionic_link_qcq_interrupts(struct ionic_qcq *src_qcq,
@ -373,8 +468,11 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
static int ionic_qcqs_alloc(struct ionic_lif *lif)
{
struct device *dev = lif->ionic->dev;
unsigned int q_list_size;
unsigned int flags;
int err;
int i;
flags = IONIC_QCQ_F_INTR;
err = ionic_qcq_alloc(lif, IONIC_QTYPE_ADMINQ, 0, "admin", flags,
@ -399,8 +497,49 @@ static int ionic_qcqs_alloc(struct ionic_lif *lif)
ionic_link_qcq_interrupts(lif->adminqcq, lif->notifyqcq);
}
q_list_size = sizeof(*lif->txqcqs) * lif->nxqs;
err = -ENOMEM;
lif->txqcqs = devm_kzalloc(dev, q_list_size, GFP_KERNEL);
if (!lif->txqcqs)
goto err_out_free_notifyqcq;
for (i = 0; i < lif->nxqs; i++) {
lif->txqcqs[i].stats = devm_kzalloc(dev,
sizeof(struct ionic_q_stats),
GFP_KERNEL);
if (!lif->txqcqs[i].stats)
goto err_out_free_tx_stats;
}
lif->rxqcqs = devm_kzalloc(dev, q_list_size, GFP_KERNEL);
if (!lif->rxqcqs)
goto err_out_free_tx_stats;
for (i = 0; i < lif->nxqs; i++) {
lif->rxqcqs[i].stats = devm_kzalloc(dev,
sizeof(struct ionic_q_stats),
GFP_KERNEL);
if (!lif->rxqcqs[i].stats)
goto err_out_free_rx_stats;
}
return 0;
err_out_free_rx_stats:
for (i = 0; i < lif->nxqs; i++)
if (lif->rxqcqs[i].stats)
devm_kfree(dev, lif->rxqcqs[i].stats);
devm_kfree(dev, lif->rxqcqs);
lif->rxqcqs = NULL;
err_out_free_tx_stats:
for (i = 0; i < lif->nxqs; i++)
if (lif->txqcqs[i].stats)
devm_kfree(dev, lif->txqcqs[i].stats);
devm_kfree(dev, lif->txqcqs);
lif->txqcqs = NULL;
err_out_free_notifyqcq:
if (lif->notifyqcq) {
ionic_qcq_free(lif, lif->notifyqcq);
lif->notifyqcq = NULL;
}
err_out_free_adminqcq:
ionic_qcq_free(lif, lif->adminqcq);
lif->adminqcq = NULL;
@ -408,6 +547,107 @@ static int ionic_qcqs_alloc(struct ionic_lif *lif)
return err;
}
static int ionic_lif_txq_init(struct ionic_lif *lif, struct ionic_qcq *qcq)
{
struct device *dev = lif->ionic->dev;
struct ionic_queue *q = &qcq->q;
struct ionic_cq *cq = &qcq->cq;
struct ionic_admin_ctx ctx = {
.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
.cmd.q_init = {
.opcode = IONIC_CMD_Q_INIT,
.lif_index = cpu_to_le16(lif->index),
.type = q->type,
.index = cpu_to_le32(q->index),
.flags = cpu_to_le16(IONIC_QINIT_F_IRQ |
IONIC_QINIT_F_SG),
.intr_index = cpu_to_le16(lif->rxqcqs[q->index].qcq->intr.index),
.pid = cpu_to_le16(q->pid),
.ring_size = ilog2(q->num_descs),
.ring_base = cpu_to_le64(q->base_pa),
.cq_ring_base = cpu_to_le64(cq->base_pa),
.sg_ring_base = cpu_to_le64(q->sg_base_pa),
},
};
int err;
dev_dbg(dev, "txq_init.pid %d\n", ctx.cmd.q_init.pid);
dev_dbg(dev, "txq_init.index %d\n", ctx.cmd.q_init.index);
dev_dbg(dev, "txq_init.ring_base 0x%llx\n", ctx.cmd.q_init.ring_base);
dev_dbg(dev, "txq_init.ring_size %d\n", ctx.cmd.q_init.ring_size);
err = ionic_adminq_post_wait(lif, &ctx);
if (err)
return err;
q->hw_type = ctx.comp.q_init.hw_type;
q->hw_index = le32_to_cpu(ctx.comp.q_init.hw_index);
q->dbval = IONIC_DBELL_QID(q->hw_index);
dev_dbg(dev, "txq->hw_type %d\n", q->hw_type);
dev_dbg(dev, "txq->hw_index %d\n", q->hw_index);
qcq->flags |= IONIC_QCQ_F_INITED;
ionic_debugfs_add_qcq(lif, qcq);
return 0;
}
static int ionic_lif_rxq_init(struct ionic_lif *lif, struct ionic_qcq *qcq)
{
struct device *dev = lif->ionic->dev;
struct ionic_queue *q = &qcq->q;
struct ionic_cq *cq = &qcq->cq;
struct ionic_admin_ctx ctx = {
.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
.cmd.q_init = {
.opcode = IONIC_CMD_Q_INIT,
.lif_index = cpu_to_le16(lif->index),
.type = q->type,
.index = cpu_to_le32(q->index),
.flags = cpu_to_le16(IONIC_QINIT_F_IRQ),
.intr_index = cpu_to_le16(cq->bound_intr->index),
.pid = cpu_to_le16(q->pid),
.ring_size = ilog2(q->num_descs),
.ring_base = cpu_to_le64(q->base_pa),
.cq_ring_base = cpu_to_le64(cq->base_pa),
},
};
int err;
dev_dbg(dev, "rxq_init.pid %d\n", ctx.cmd.q_init.pid);
dev_dbg(dev, "rxq_init.index %d\n", ctx.cmd.q_init.index);
dev_dbg(dev, "rxq_init.ring_base 0x%llx\n", ctx.cmd.q_init.ring_base);
dev_dbg(dev, "rxq_init.ring_size %d\n", ctx.cmd.q_init.ring_size);
err = ionic_adminq_post_wait(lif, &ctx);
if (err)
return err;
q->hw_type = ctx.comp.q_init.hw_type;
q->hw_index = le32_to_cpu(ctx.comp.q_init.hw_index);
q->dbval = IONIC_DBELL_QID(q->hw_index);
dev_dbg(dev, "rxq->hw_type %d\n", q->hw_type);
dev_dbg(dev, "rxq->hw_index %d\n", q->hw_index);
netif_napi_add(lif->netdev, &qcq->napi, ionic_rx_napi,
NAPI_POLL_WEIGHT);
err = ionic_request_irq(lif, qcq);
if (err) {
netif_napi_del(&qcq->napi);
return err;
}
qcq->flags |= IONIC_QCQ_F_INITED;
ionic_debugfs_add_qcq(lif, qcq);
return 0;
}
static bool ionic_notifyq_service(struct ionic_cq *cq,
struct ionic_cq_info *cq_info)
{
@ -1075,17 +1315,180 @@ static int ionic_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto,
return ionic_adminq_post_wait(lif, &ctx);
}
static void ionic_txrx_disable(struct ionic_lif *lif)
{
unsigned int i;
for (i = 0; i < lif->nxqs; i++) {
ionic_qcq_disable(lif->txqcqs[i].qcq);
ionic_qcq_disable(lif->rxqcqs[i].qcq);
}
}
static void ionic_txrx_deinit(struct ionic_lif *lif)
{
unsigned int i;
for (i = 0; i < lif->nxqs; i++) {
ionic_lif_qcq_deinit(lif, lif->txqcqs[i].qcq);
ionic_tx_flush(&lif->txqcqs[i].qcq->cq);
ionic_lif_qcq_deinit(lif, lif->rxqcqs[i].qcq);
ionic_rx_flush(&lif->rxqcqs[i].qcq->cq);
ionic_rx_empty(&lif->rxqcqs[i].qcq->q);
}
}
static void ionic_txrx_free(struct ionic_lif *lif)
{
unsigned int i;
for (i = 0; i < lif->nxqs; i++) {
ionic_qcq_free(lif, lif->txqcqs[i].qcq);
lif->txqcqs[i].qcq = NULL;
ionic_qcq_free(lif, lif->rxqcqs[i].qcq);
lif->rxqcqs[i].qcq = NULL;
}
}
static int ionic_txrx_alloc(struct ionic_lif *lif)
{
unsigned int flags;
unsigned int i;
int err = 0;
flags = IONIC_QCQ_F_TX_STATS | IONIC_QCQ_F_SG;
for (i = 0; i < lif->nxqs; i++) {
err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
lif->ntxq_descs,
sizeof(struct ionic_txq_desc),
sizeof(struct ionic_txq_comp),
sizeof(struct ionic_txq_sg_desc),
lif->kern_pid, &lif->txqcqs[i].qcq);
if (err)
goto err_out;
lif->txqcqs[i].qcq->stats = lif->txqcqs[i].stats;
}
flags = IONIC_QCQ_F_RX_STATS | IONIC_QCQ_F_INTR;
for (i = 0; i < lif->nxqs; i++) {
err = ionic_qcq_alloc(lif, IONIC_QTYPE_RXQ, i, "rx", flags,
lif->nrxq_descs,
sizeof(struct ionic_rxq_desc),
sizeof(struct ionic_rxq_comp),
0, lif->kern_pid, &lif->rxqcqs[i].qcq);
if (err)
goto err_out;
lif->rxqcqs[i].qcq->stats = lif->rxqcqs[i].stats;
ionic_link_qcq_interrupts(lif->rxqcqs[i].qcq,
lif->txqcqs[i].qcq);
}
return 0;
err_out:
ionic_txrx_free(lif);
return err;
}
static int ionic_txrx_init(struct ionic_lif *lif)
{
unsigned int i;
int err;
for (i = 0; i < lif->nxqs; i++) {
err = ionic_lif_txq_init(lif, lif->txqcqs[i].qcq);
if (err)
goto err_out;
err = ionic_lif_rxq_init(lif, lif->rxqcqs[i].qcq);
if (err) {
ionic_lif_qcq_deinit(lif, lif->txqcqs[i].qcq);
goto err_out;
}
}
ionic_set_rx_mode(lif->netdev);
return 0;
err_out:
while (i--) {
ionic_lif_qcq_deinit(lif, lif->txqcqs[i].qcq);
ionic_lif_qcq_deinit(lif, lif->rxqcqs[i].qcq);
}
return err;
}
static int ionic_txrx_enable(struct ionic_lif *lif)
{
int i, err;
for (i = 0; i < lif->nxqs; i++) {
err = ionic_qcq_enable(lif->txqcqs[i].qcq);
if (err)
goto err_out;
ionic_rx_fill(&lif->rxqcqs[i].qcq->q);
err = ionic_qcq_enable(lif->rxqcqs[i].qcq);
if (err) {
ionic_qcq_disable(lif->txqcqs[i].qcq);
goto err_out;
}
}
return 0;
err_out:
while (i--) {
ionic_qcq_disable(lif->rxqcqs[i].qcq);
ionic_qcq_disable(lif->txqcqs[i].qcq);
}
return err;
}
int ionic_open(struct net_device *netdev)
{
struct ionic_lif *lif = netdev_priv(netdev);
int err;
netif_carrier_off(netdev);
err = ionic_txrx_alloc(lif);
if (err)
return err;
err = ionic_txrx_init(lif);
if (err)
goto err_txrx_free;
err = ionic_txrx_enable(lif);
if (err)
goto err_txrx_deinit;
netif_set_real_num_tx_queues(netdev, lif->nxqs);
netif_set_real_num_rx_queues(netdev, lif->nxqs);
set_bit(IONIC_LIF_UP, lif->state);
ionic_link_status_check_request(lif);
if (netif_carrier_ok(netdev))
netif_tx_wake_all_queues(netdev);
return 0;
err_txrx_deinit:
ionic_txrx_deinit(lif);
err_txrx_free:
ionic_txrx_free(lif);
return err;
}
int ionic_stop(struct net_device *netdev)
@ -1103,6 +1506,12 @@ int ionic_stop(struct net_device *netdev)
/* carrier off before disabling queues to avoid watchdog timeout */
netif_carrier_off(netdev);
netif_tx_stop_all_queues(netdev);
netif_tx_disable(netdev);
ionic_txrx_disable(lif);
ionic_txrx_deinit(lif);
ionic_txrx_free(lif);
return err;
}
@ -1110,6 +1519,7 @@ int ionic_stop(struct net_device *netdev)
static const struct net_device_ops ionic_netdev_ops = {
.ndo_open = ionic_open,
.ndo_stop = ionic_stop,
.ndo_start_xmit = ionic_start_xmit,
.ndo_get_stats64 = ionic_get_stats64,
.ndo_set_rx_mode = ionic_set_rx_mode,
.ndo_set_features = ionic_set_features,
@ -1174,6 +1584,8 @@ static struct ionic_lif *ionic_lif_alloc(struct ionic *ionic, unsigned int index
lif->ionic = ionic;
lif->index = index;
lif->ntxq_descs = IONIC_DEF_TXRX_DESC;
lif->nrxq_descs = IONIC_DEF_TXRX_DESC;
snprintf(lif->name, sizeof(lif->name), "lif%u", index);
@ -1507,6 +1919,8 @@ static int ionic_lif_init(struct ionic_lif *lif)
if (err)
goto err_out_notifyq_deinit;
lif->rx_copybreak = IONIC_RX_COPYBREAK_DEFAULT;
set_bit(IONIC_LIF_INITED, lif->state);
return 0;

50
drivers/net/ethernet/pensando/ionic/ionic_lif.h
View File

@ -12,20 +12,38 @@
#define IONIC_MAX_NUM_NAPI_CNTR (NAPI_POLL_WEIGHT + 1)
#define IONIC_MAX_NUM_SG_CNTR (IONIC_TX_MAX_SG_ELEMS + 1)
#define IONIC_RX_COPYBREAK_DEFAULT 256
struct ionic_tx_stats {
u64 dma_map_err;
u64 pkts;
u64 bytes;
u64 clean;
u64 linearize;
u64 no_csum;
u64 csum;
u64 crc32_csum;
u64 tso;
u64 frags;
u64 sg_cntr[IONIC_MAX_NUM_SG_CNTR];
};
struct ionic_rx_stats {
u64 dma_map_err;
u64 alloc_err;
u64 pkts;
u64 bytes;
u64 csum_none;
u64 csum_complete;
u64 csum_error;
u64 buffers_posted;
};
#define IONIC_QCQ_F_INITED BIT(0)
#define IONIC_QCQ_F_SG BIT(1)
#define IONIC_QCQ_F_INTR BIT(2)
#define IONIC_QCQ_F_TX_STATS BIT(3)
#define IONIC_QCQ_F_RX_STATS BIT(4)
#define IONIC_QCQ_F_NOTIFYQ BIT(5)
struct ionic_napi_stats {
@ -54,7 +72,14 @@ struct ionic_qcq {
struct dentry *dentry;
};
struct ionic_qcqst {
struct ionic_qcq *qcq;
struct ionic_q_stats *stats;
};
#define q_to_qcq(q) container_of(q, struct ionic_qcq, q)
#define q_to_tx_stats(q) (&q_to_qcq(q)->stats->tx)
#define q_to_rx_stats(q) (&q_to_qcq(q)->stats->rx)
#define napi_to_qcq(napi) container_of(napi, struct ionic_qcq, napi)
#define napi_to_cq(napi) (&napi_to_qcq(napi)->cq)
@ -106,11 +131,14 @@ struct ionic_lif {
spinlock_t adminq_lock; /* lock for AdminQ operations */
struct ionic_qcq *adminqcq;
struct ionic_qcq *notifyqcq;
struct ionic_qcqst *txqcqs;
struct ionic_qcqst *rxqcqs;
u64 last_eid;
unsigned int neqs;
unsigned int nxqs;
unsigned int ntxq_descs;
unsigned int nrxq_descs;
u32 rx_copybreak;
unsigned int rx_mode;
u64 hw_features;
bool mc_overflow;
@ -131,6 +159,11 @@ struct ionic_lif {
u32 flags;
};
#define lif_to_txqcq(lif, i) ((lif)->txqcqs[i].qcq)
#define lif_to_rxqcq(lif, i) ((lif)->rxqcqs[i].qcq)
#define lif_to_txq(lif, i) (&lif_to_txqcq((lif), i)->q)
#define lif_to_rxq(lif, i) (&lif_to_txqcq((lif), i)->q)
static inline int ionic_wait_for_bit(struct ionic_lif *lif, int bitname)
{
unsigned long tlimit = jiffies + HZ;
@ -156,6 +189,20 @@ int ionic_open(struct net_device *netdev);
int ionic_stop(struct net_device *netdev);
int ionic_reset_queues(struct ionic_lif *lif);
static inline void debug_stats_txq_post(struct ionic_qcq *qcq,
struct ionic_txq_desc *desc, bool dbell)
{
u8 num_sg_elems = ((le64_to_cpu(desc->cmd) >> IONIC_TXQ_DESC_NSGE_SHIFT)
& IONIC_TXQ_DESC_NSGE_MASK);
qcq->q.dbell_count += dbell;
if (num_sg_elems > (IONIC_MAX_NUM_SG_CNTR - 1))
num_sg_elems = IONIC_MAX_NUM_SG_CNTR - 1;
qcq->stats->tx.sg_cntr[num_sg_elems]++;
}
static inline void debug_stats_napi_poll(struct ionic_qcq *qcq,
unsigned int work_done)
{
@ -168,7 +215,10 @@ static inline void debug_stats_napi_poll(struct ionic_qcq *qcq,
}
#define DEBUG_STATS_CQE_CNT(cq) ((cq)->compl_count++)
#define DEBUG_STATS_RX_BUFF_CNT(qcq) ((qcq)->stats->rx.buffers_posted++)
#define DEBUG_STATS_INTR_REARM(intr) ((intr)->rearm_count++)
#define DEBUG_STATS_TXQ_POST(qcq, txdesc, dbell) \
debug_stats_txq_post(qcq, txdesc, dbell)
#define DEBUG_STATS_NAPI_POLL(qcq, work_done) \
debug_stats_napi_poll(qcq, work_done)

927
drivers/net/ethernet/pensando/ionic/ionic_txrx.c Normal file
View File

@ -0,0 +1,927 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_vlan.h>
#include <net/ip6_checksum.h>
#include "ionic.h"
#include "ionic_lif.h"
#include "ionic_txrx.h"
static void ionic_rx_clean(struct ionic_queue *q, struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info, void *cb_arg);
static inline void ionic_txq_post(struct ionic_queue *q, bool ring_dbell,
ionic_desc_cb cb_func, void *cb_arg)
{
DEBUG_STATS_TXQ_POST(q_to_qcq(q), q->head->desc, ring_dbell);
ionic_q_post(q, ring_dbell, cb_func, cb_arg);
}
static inline void ionic_rxq_post(struct ionic_queue *q, bool ring_dbell,
ionic_desc_cb cb_func, void *cb_arg)
{
ionic_q_post(q, ring_dbell, cb_func, cb_arg);
DEBUG_STATS_RX_BUFF_CNT(q_to_qcq(q));
}
static inline struct netdev_queue *q_to_ndq(struct ionic_queue *q)
{
return netdev_get_tx_queue(q->lif->netdev, q->index);
}
static void ionic_rx_recycle(struct ionic_queue *q, struct ionic_desc_info *desc_info,
struct sk_buff *skb)
{
struct ionic_rxq_desc *old = desc_info->desc;
struct ionic_rxq_desc *new = q->head->desc;
new->addr = old->addr;
new->len = old->len;
ionic_rxq_post(q, true, ionic_rx_clean, skb);
}
static bool ionic_rx_copybreak(struct ionic_queue *q, struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info, struct sk_buff **skb)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct ionic_rxq_desc *desc = desc_info->desc;
struct net_device *netdev = q->lif->netdev;
struct device *dev = q->lif->ionic->dev;
struct sk_buff *new_skb;
u16 clen, dlen;
clen = le16_to_cpu(comp->len);
dlen = le16_to_cpu(desc->len);
if (clen > q->lif->rx_copybreak) {
dma_unmap_single(dev, (dma_addr_t)le64_to_cpu(desc->addr),
dlen, DMA_FROM_DEVICE);
return false;
}
new_skb = netdev_alloc_skb_ip_align(netdev, clen);
if (!new_skb) {
dma_unmap_single(dev, (dma_addr_t)le64_to_cpu(desc->addr),
dlen, DMA_FROM_DEVICE);
return false;
}
dma_sync_single_for_cpu(dev, (dma_addr_t)le64_to_cpu(desc->addr),
clen, DMA_FROM_DEVICE);
memcpy(new_skb->data, (*skb)->data, clen);
ionic_rx_recycle(q, desc_info, *skb);
*skb = new_skb;
return true;
}
static void ionic_rx_clean(struct ionic_queue *q, struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info, void *cb_arg)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct ionic_qcq *qcq = q_to_qcq(q);
struct sk_buff *skb = cb_arg;
struct ionic_rx_stats *stats;
struct net_device *netdev;
stats = q_to_rx_stats(q);
netdev = q->lif->netdev;
if (comp->status) {
ionic_rx_recycle(q, desc_info, skb);
return;
}
if (unlikely(test_bit(IONIC_LIF_QUEUE_RESET, q->lif->state))) {
/* no packet processing while resetting */
ionic_rx_recycle(q, desc_info, skb);
return;
}
stats->pkts++;
stats->bytes += le16_to_cpu(comp->len);
ionic_rx_copybreak(q, desc_info, cq_info, &skb);
skb_put(skb, le16_to_cpu(comp->len));
skb->protocol = eth_type_trans(skb, netdev);
skb_record_rx_queue(skb, q->index);
if (netdev->features & NETIF_F_RXHASH) {
switch (comp->pkt_type_color & IONIC_RXQ_COMP_PKT_TYPE_MASK) {
case IONIC_PKT_TYPE_IPV4:
case IONIC_PKT_TYPE_IPV6:
skb_set_hash(skb, le32_to_cpu(comp->rss_hash),
PKT_HASH_TYPE_L3);
break;
case IONIC_PKT_TYPE_IPV4_TCP:
case IONIC_PKT_TYPE_IPV6_TCP:
case IONIC_PKT_TYPE_IPV4_UDP:
case IONIC_PKT_TYPE_IPV6_UDP:
skb_set_hash(skb, le32_to_cpu(comp->rss_hash),
PKT_HASH_TYPE_L4);
break;
}
}
if (netdev->features & NETIF_F_RXCSUM) {
if (comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_CALC) {
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = (__wsum)le16_to_cpu(comp->csum);
stats->csum_complete++;
}
} else {
stats->csum_none++;
}
if ((comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_TCP_BAD) ||
(comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_UDP_BAD) ||
(comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_IP_BAD))
stats->csum_error++;
if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
if (comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_VLAN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
le16_to_cpu(comp->vlan_tci));
}
napi_gro_receive(&qcq->napi, skb);
}
static bool ionic_rx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct ionic_queue *q = cq->bound_q;
struct ionic_desc_info *desc_info;
if (!color_match(comp->pkt_type_color, cq->done_color))
return false;
/* check for empty queue */
if (q->tail->index == q->head->index)
return false;
desc_info = q->tail;
if (desc_info->index != le16_to_cpu(comp->comp_index))
return false;
q->tail = desc_info->next;
/* clean the related q entry, only one per qc completion */
ionic_rx_clean(q, desc_info, cq_info, desc_info->cb_arg);
desc_info->cb = NULL;
desc_info->cb_arg = NULL;
return true;
}
static u32 ionic_rx_walk_cq(struct ionic_cq *rxcq, u32 limit)
{
u32 work_done = 0;
while (ionic_rx_service(rxcq, rxcq->tail)) {
if (rxcq->tail->last)
rxcq->done_color = !rxcq->done_color;
rxcq->tail = rxcq->tail->next;
DEBUG_STATS_CQE_CNT(rxcq);
if (++work_done >= limit)
break;
}
return work_done;
}
void ionic_rx_flush(struct ionic_cq *cq)
{
struct ionic_dev *idev = &cq->lif->ionic->idev;
u32 work_done;
work_done = ionic_rx_walk_cq(cq, cq->num_descs);
if (work_done)
ionic_intr_credits(idev->intr_ctrl, cq->bound_intr->index,
work_done, IONIC_INTR_CRED_RESET_COALESCE);
}
static struct sk_buff *ionic_rx_skb_alloc(struct ionic_queue *q, unsigned int len,
dma_addr_t *dma_addr)
{
struct ionic_lif *lif = q->lif;
struct ionic_rx_stats *stats;
struct net_device *netdev;
struct sk_buff *skb;
struct device *dev;
netdev = lif->netdev;
dev = lif->ionic->dev;
stats = q_to_rx_stats(q);
skb = netdev_alloc_skb_ip_align(netdev, len);
if (!skb) {
net_warn_ratelimited("%s: SKB alloc failed on %s!\n",
netdev->name, q->name);
stats->alloc_err++;
return NULL;
}
*dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, *dma_addr)) {
dev_kfree_skb(skb);
net_warn_ratelimited("%s: DMA single map failed on %s!\n",
netdev->name, q->name);
stats->dma_map_err++;
return NULL;
}
return skb;
}
#define IONIC_RX_RING_DOORBELL_STRIDE ((1 << 2) - 1)
void ionic_rx_fill(struct ionic_queue *q)
{
struct net_device *netdev = q->lif->netdev;
struct ionic_rxq_desc *desc;
struct sk_buff *skb;
dma_addr_t dma_addr;
bool ring_doorbell;
unsigned int len;
unsigned int i;
len = netdev->mtu + ETH_HLEN;
for (i = ionic_q_space_avail(q); i; i--) {
skb = ionic_rx_skb_alloc(q, len, &dma_addr);
if (!skb)
return;
desc = q->head->desc;
desc->addr = cpu_to_le64(dma_addr);
desc->len = cpu_to_le16(len);
desc->opcode = IONIC_RXQ_DESC_OPCODE_SIMPLE;
ring_doorbell = ((q->head->index + 1) &
IONIC_RX_RING_DOORBELL_STRIDE) == 0;
ionic_rxq_post(q, ring_doorbell, ionic_rx_clean, skb);
}
}
static void ionic_rx_fill_cb(void *arg)
{
ionic_rx_fill(arg);
}
void ionic_rx_empty(struct ionic_queue *q)
{
struct device *dev = q->lif->ionic->dev;
struct ionic_desc_info *cur;
struct ionic_rxq_desc *desc;
for (cur = q->tail; cur != q->head; cur = cur->next) {
desc = cur->desc;
dma_unmap_single(dev, le64_to_cpu(desc->addr),
le16_to_cpu(desc->len), DMA_FROM_DEVICE);
dev_kfree_skb(cur->cb_arg);
cur->cb_arg = NULL;
}
}
int ionic_rx_napi(struct napi_struct *napi, int budget)
{
struct ionic_qcq *qcq = napi_to_qcq(napi);
struct ionic_cq *rxcq = napi_to_cq(napi);
unsigned int qi = rxcq->bound_q->index;
struct ionic_dev *idev;
struct ionic_lif *lif;
struct ionic_cq *txcq;
u32 work_done = 0;
u32 flags = 0;
lif = rxcq->bound_q->lif;
idev = &lif->ionic->idev;
txcq = &lif->txqcqs[qi].qcq->cq;
ionic_tx_flush(txcq);
work_done = ionic_rx_walk_cq(rxcq, budget);
if (work_done)
ionic_rx_fill_cb(rxcq->bound_q);
if (work_done < budget && napi_complete_done(napi, work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
DEBUG_STATS_INTR_REARM(rxcq->bound_intr);
}
if (work_done || flags) {
flags |= IONIC_INTR_CRED_RESET_COALESCE;
ionic_intr_credits(idev->intr_ctrl, rxcq->bound_intr->index,
work_done, flags);
}
DEBUG_STATS_NAPI_POLL(qcq, work_done);
return work_done;
}
static dma_addr_t ionic_tx_map_single(struct ionic_queue *q, void *data, size_t len)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
dma_addr = dma_map_single(dev, data, len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
net_warn_ratelimited("%s: DMA single map failed on %s!\n",
q->lif->netdev->name, q->name);
stats->dma_map_err++;
return 0;
}
return dma_addr;
}
static dma_addr_t ionic_tx_map_frag(struct ionic_queue *q, const skb_frag_t *frag,
size_t offset, size_t len)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
dma_addr = skb_frag_dma_map(dev, frag, offset, len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
net_warn_ratelimited("%s: DMA frag map failed on %s!\n",
q->lif->netdev->name, q->name);
stats->dma_map_err++;
}
return dma_addr;
}
static void ionic_tx_clean(struct ionic_queue *q, struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info, void *cb_arg)
{
struct ionic_txq_sg_desc *sg_desc = desc_info->sg_desc;
struct ionic_txq_sg_elem *elem = sg_desc->elems;
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = desc_info->desc;
struct device *dev = q->lif->ionic->dev;
u8 opcode, flags, nsge;
u16 queue_index;
unsigned int i;
u64 addr;
decode_txq_desc_cmd(le64_to_cpu(desc->cmd),
&opcode, &flags, &nsge, &addr);
/* use unmap_single only if either this is not TSO,
* or this is first descriptor of a TSO
*/
if (opcode != IONIC_TXQ_DESC_OPCODE_TSO ||
flags & IONIC_TXQ_DESC_FLAG_TSO_SOT)
dma_unmap_single(dev, (dma_addr_t)addr,
le16_to_cpu(desc->len), DMA_TO_DEVICE);
else
dma_unmap_page(dev, (dma_addr_t)addr,
le16_to_cpu(desc->len), DMA_TO_DEVICE);
for (i = 0; i < nsge; i++, elem++)
dma_unmap_page(dev, (dma_addr_t)le64_to_cpu(elem->addr),
le16_to_cpu(elem->len), DMA_TO_DEVICE);
if (cb_arg) {
struct sk_buff *skb = cb_arg;
u32 len = skb->len;
queue_index = skb_get_queue_mapping(skb);
if (unlikely(__netif_subqueue_stopped(q->lif->netdev,
queue_index))) {
netif_wake_subqueue(q->lif->netdev, queue_index);
q->wake++;
}
dev_kfree_skb_any(skb);
stats->clean++;
netdev_tx_completed_queue(q_to_ndq(q), 1, len);
}
}
void ionic_tx_flush(struct ionic_cq *cq)
{
struct ionic_txq_comp *comp = cq->tail->cq_desc;
struct ionic_dev *idev = &cq->lif->ionic->idev;
struct ionic_queue *q = cq->bound_q;
struct ionic_desc_info *desc_info;
unsigned int work_done = 0;
/* walk the completed cq entries */
while (work_done < cq->num_descs &&
color_match(comp->color, cq->done_color)) {
/* clean the related q entries, there could be
* several q entries completed for each cq completion
*/
do {
desc_info = q->tail;
q->tail = desc_info->next;
ionic_tx_clean(q, desc_info, cq->tail,
desc_info->cb_arg);
desc_info->cb = NULL;
desc_info->cb_arg = NULL;
} while (desc_info->index != le16_to_cpu(comp->comp_index));
if (cq->tail->last)
cq->done_color = !cq->done_color;
cq->tail = cq->tail->next;
comp = cq->tail->cq_desc;
DEBUG_STATS_CQE_CNT(cq);
work_done++;
}
if (work_done)
ionic_intr_credits(idev->intr_ctrl, cq->bound_intr->index,
work_done, 0);
}
static int ionic_tx_tcp_inner_pseudo_csum(struct sk_buff *skb)
{
int err;
err = skb_cow_head(skb, 0);
if (err)
return err;
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
inner_ip_hdr(skb)->check = 0;
inner_tcp_hdr(skb)->check =
~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
inner_ip_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
inner_tcp_hdr(skb)->check =
~csum_ipv6_magic(&inner_ipv6_hdr(skb)->saddr,
&inner_ipv6_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
}
return 0;
}
static int ionic_tx_tcp_pseudo_csum(struct sk_buff *skb)
{
int err;
err = skb_cow_head(skb, 0);
if (err)
return err;
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
ip_hdr(skb)->check = 0;
tcp_hdr(skb)->check =
~csum_tcpudp_magic(ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
tcp_hdr(skb)->check =
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
}
return 0;
}
static void ionic_tx_tso_post(struct ionic_queue *q, struct ionic_txq_desc *desc,
struct sk_buff *skb,
dma_addr_t addr, u8 nsge, u16 len,
unsigned int hdrlen, unsigned int mss,
bool outer_csum,
u16 vlan_tci, bool has_vlan,
bool start, bool done)
{
u8 flags = 0;
u64 cmd;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= outer_csum ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
flags |= start ? IONIC_TXQ_DESC_FLAG_TSO_SOT : 0;
flags |= done ? IONIC_TXQ_DESC_FLAG_TSO_EOT : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_TSO, flags, nsge, addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(len);
desc->vlan_tci = cpu_to_le16(vlan_tci);
desc->hdr_len = cpu_to_le16(hdrlen);
desc->mss = cpu_to_le16(mss);
if (done) {
skb_tx_timestamp(skb);
netdev_tx_sent_queue(q_to_ndq(q), skb->len);
ionic_txq_post(q, !netdev_xmit_more(), ionic_tx_clean, skb);
} else {
ionic_txq_post(q, false, ionic_tx_clean, NULL);
}
}
static struct ionic_txq_desc *ionic_tx_tso_next(struct ionic_queue *q,
struct ionic_txq_sg_elem **elem)
{
struct ionic_txq_sg_desc *sg_desc = q->head->sg_desc;
struct ionic_txq_desc *desc = q->head->desc;
*elem = sg_desc->elems;
return desc;
}
static int ionic_tx_tso(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_desc_info *abort = q->head;
struct device *dev = q->lif->ionic->dev;
struct ionic_desc_info *rewind = abort;
struct ionic_txq_sg_elem *elem;
struct ionic_txq_desc *desc;
unsigned int frag_left = 0;
unsigned int offset = 0;
unsigned int len_left;
dma_addr_t desc_addr;
unsigned int hdrlen;
unsigned int nfrags;
unsigned int seglen;
u64 total_bytes = 0;
u64 total_pkts = 0;
unsigned int left;
unsigned int len;
unsigned int mss;
skb_frag_t *frag;
bool start, done;
bool outer_csum;
bool has_vlan;
u16 desc_len;
u8 desc_nsge;
u16 vlan_tci;
bool encap;
int err;
mss = skb_shinfo(skb)->gso_size;
nfrags = skb_shinfo(skb)->nr_frags;
len_left = skb->len - skb_headlen(skb);
outer_csum = (skb_shinfo(skb)->gso_type & SKB_GSO_GRE_CSUM) ||
(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
has_vlan = !!skb_vlan_tag_present(skb);
vlan_tci = skb_vlan_tag_get(skb);
encap = skb->encapsulation;
/* Preload inner-most TCP csum field with IP pseudo hdr
* calculated with IP length set to zero. HW will later
* add in length to each TCP segment resulting from the TSO.
*/
if (encap)
err = ionic_tx_tcp_inner_pseudo_csum(skb);
else
err = ionic_tx_tcp_pseudo_csum(skb);
if (err)
return err;
if (encap)
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
else
hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
seglen = hdrlen + mss;
left = skb_headlen(skb);
desc = ionic_tx_tso_next(q, &elem);
start = true;
/* Chop skb->data up into desc segments */
while (left > 0) {
len = min(seglen, left);
frag_left = seglen - len;
desc_addr = ionic_tx_map_single(q, skb->data + offset, len);
if (dma_mapping_error(dev, desc_addr))
goto err_out_abort;
desc_len = len;
desc_nsge = 0;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb,
desc_addr, desc_nsge, desc_len,
hdrlen, mss,
outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
seglen = mss;
}
/* Chop skb frags into desc segments */
for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
offset = 0;
left = skb_frag_size(frag);
len_left -= left;
nfrags--;
stats->frags++;
while (left > 0) {
if (frag_left > 0) {
len = min(frag_left, left);
frag_left -= len;
elem->addr =
cpu_to_le64(ionic_tx_map_frag(q, frag,
offset, len));
if (dma_mapping_error(dev, elem->addr))
goto err_out_abort;
elem->len = cpu_to_le16(len);
elem++;
desc_nsge++;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb, desc_addr,
desc_nsge, desc_len,
hdrlen, mss, outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
} else {
len = min(mss, left);
frag_left = mss - len;
desc_addr = ionic_tx_map_frag(q, frag,
offset, len);
if (dma_mapping_error(dev, desc_addr))
goto err_out_abort;
desc_len = len;
desc_nsge = 0;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb, desc_addr,
desc_nsge, desc_len,
hdrlen, mss, outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
}
}
}
stats->pkts += total_pkts;
stats->bytes += total_bytes;
stats->tso++;
return 0;
err_out_abort:
while (rewind->desc != q->head->desc) {
ionic_tx_clean(q, rewind, NULL, NULL);
rewind = rewind->next;
}
q->head = abort;
return -ENOMEM;
}
static int ionic_tx_calc_csum(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = q->head->desc;
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
bool has_vlan;
u8 flags = 0;
bool encap;
u64 cmd;
has_vlan = !!skb_vlan_tag_present(skb);
encap = skb->encapsulation;
dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= encap ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_CSUM_PARTIAL,
flags, skb_shinfo(skb)->nr_frags, dma_addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(skb_headlen(skb));
desc->vlan_tci = cpu_to_le16(skb_vlan_tag_get(skb));
desc->csum_start = cpu_to_le16(skb_checksum_start_offset(skb));
desc->csum_offset = cpu_to_le16(skb->csum_offset);
if (skb->csum_not_inet)
stats->crc32_csum++;
else
stats->csum++;
return 0;
}
static int ionic_tx_calc_no_csum(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = q->head->desc;
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
bool has_vlan;
u8 flags = 0;
bool encap;
u64 cmd;
has_vlan = !!skb_vlan_tag_present(skb);
encap = skb->encapsulation;
dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= encap ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_CSUM_NONE,
flags, skb_shinfo(skb)->nr_frags, dma_addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(skb_headlen(skb));
desc->vlan_tci = cpu_to_le16(skb_vlan_tag_get(skb));
stats->no_csum++;
return 0;
}
static int ionic_tx_skb_frags(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_txq_sg_desc *sg_desc = q->head->sg_desc;
unsigned int len_left = skb->len - skb_headlen(skb);
struct ionic_txq_sg_elem *elem = sg_desc->elems;
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
skb_frag_t *frag;
u16 len;
for (frag = skb_shinfo(skb)->frags; len_left; frag++, elem++) {
len = skb_frag_size(frag);
elem->len = cpu_to_le16(len);
dma_addr = ionic_tx_map_frag(q, frag, 0, len);
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
elem->addr = cpu_to_le64(dma_addr);
len_left -= len;
stats->frags++;
}
return 0;
}
static int ionic_tx(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
int err;
/* set up the initial descriptor */
if (skb->ip_summed == CHECKSUM_PARTIAL)
err = ionic_tx_calc_csum(q, skb);
else
err = ionic_tx_calc_no_csum(q, skb);
if (err)
return err;
/* add frags */
err = ionic_tx_skb_frags(q, skb);
if (err)
return err;
skb_tx_timestamp(skb);
stats->pkts++;
stats->bytes += skb->len;
netdev_tx_sent_queue(q_to_ndq(q), skb->len);
ionic_txq_post(q, !netdev_xmit_more(), ionic_tx_clean, skb);
return 0;
}
static int ionic_tx_descs_needed(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
int err;
/* If TSO, need roundup(skb->len/mss) descs */
if (skb_is_gso(skb))
return (skb->len / skb_shinfo(skb)->gso_size) + 1;
/* If non-TSO, just need 1 desc and nr_frags sg elems */
if (skb_shinfo(skb)->nr_frags <= IONIC_TX_MAX_SG_ELEMS)
return 1;
/* Too many frags, so linearize */
err = skb_linearize(skb);
if (err)
return err;
stats->linearize++;
/* Need 1 desc and zero sg elems */
return 1;
}
static int ionic_maybe_stop_tx(struct ionic_queue *q, int ndescs)
{
int stopped = 0;
if (unlikely(!ionic_q_has_space(q, ndescs))) {
netif_stop_subqueue(q->lif->netdev, q->index);
q->stop++;
stopped = 1;
/* Might race with ionic_tx_clean, check again */
smp_rmb();
if (ionic_q_has_space(q, ndescs)) {
netif_wake_subqueue(q->lif->netdev, q->index);
stopped = 0;
}
}
return stopped;
}
netdev_tx_t ionic_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
u16 queue_index = skb_get_queue_mapping(skb);
struct ionic_lif *lif = netdev_priv(netdev);
struct ionic_queue *q;
int ndescs;
int err;
if (unlikely(!test_bit(IONIC_LIF_UP, lif->state))) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
if (unlikely(!lif_to_txqcq(lif, queue_index)))
queue_index = 0;
q = lif_to_txq(lif, queue_index);
ndescs = ionic_tx_descs_needed(q, skb);
if (ndescs < 0)
goto err_out_drop;
if (unlikely(ionic_maybe_stop_tx(q, ndescs)))
return NETDEV_TX_BUSY;
if (skb_is_gso(skb))
err = ionic_tx_tso(q, skb);
else
err = ionic_tx(q, skb);
if (err)
goto err_out_drop;
/* Stop the queue if there aren't descriptors for the next packet.
* Since our SG lists per descriptor take care of most of the possible
* fragmentation, we don't need to have many descriptors available.
*/
ionic_maybe_stop_tx(q, 4);
return NETDEV_TX_OK;
err_out_drop:
q->stop++;
q->drop++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}

15
drivers/net/ethernet/pensando/ionic/ionic_txrx.h Normal file
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@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
#ifndef _IONIC_TXRX_H_
#define _IONIC_TXRX_H_
void ionic_rx_flush(struct ionic_cq *cq);
void ionic_tx_flush(struct ionic_cq *cq);
void ionic_rx_fill(struct ionic_queue *q);
void ionic_rx_empty(struct ionic_queue *q);
int ionic_rx_napi(struct napi_struct *napi, int budget);
netdev_tx_t ionic_start_xmit(struct sk_buff *skb, struct net_device *netdev);
#endif /* _IONIC_TXRX_H_ */