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Subject[PATCH v3 net-next 6/7] net: ethernet: ti: davinci_cpdma: return handler status
Date
This change is needed to return flush status of rx handler for
flushing redirected xdp frames after processing channel packets.
Do it as separate patch for simplicity.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
drivers/net/ethernet/ti/cpsw.c | 23 +++++++++++------
drivers/net/ethernet/ti/cpsw_ethtool.c | 2 +-
drivers/net/ethernet/ti/cpsw_priv.h | 2 +-
drivers/net/ethernet/ti/davinci_cpdma.c | 34 +++++++++++++++----------
drivers/net/ethernet/ti/davinci_cpdma.h | 4 +--
drivers/net/ethernet/ti/davinci_emac.c | 18 ++++++++-----
6 files changed, 50 insertions(+), 33 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 3430503e1053..d89ad428315c 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -337,7 +337,7 @@ void cpsw_intr_disable(struct cpsw_common *cpsw)
return;
}

-void cpsw_tx_handler(void *token, int len, int status)
+int cpsw_tx_handler(void *token, int len, int status)
{
struct netdev_queue *txq;
struct sk_buff *skb = token;
@@ -355,6 +355,7 @@ void cpsw_tx_handler(void *token, int len, int status)
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += len;
dev_kfree_skb_any(skb);
+ return 0;
}

static void cpsw_rx_vlan_encap(struct sk_buff *skb)
@@ -400,7 +401,7 @@ static void cpsw_rx_vlan_encap(struct sk_buff *skb)
}
}

-static void cpsw_rx_handler(void *token, int len, int status)
+static int cpsw_rx_handler(void *token, int len, int status)
{
struct cpdma_chan *ch;
struct sk_buff *skb = token;
@@ -434,7 +435,7 @@ static void cpsw_rx_handler(void *token, int len, int status)

/* the interface is going down, skbs are purged */
dev_kfree_skb_any(skb);
- return;
+ return 0;
}

new_skb = netdev_alloc_skb_ip_align(ndev, cpsw->rx_packet_max);
@@ -459,7 +460,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
requeue:
if (netif_dormant(ndev)) {
dev_kfree_skb_any(new_skb);
- return;
+ return 0;
}

ch = cpsw->rxv[skb_get_queue_mapping(new_skb)].ch;
@@ -467,6 +468,8 @@ static void cpsw_rx_handler(void *token, int len, int status)
skb_tailroom(new_skb), 0);
if (WARN_ON(ret < 0))
dev_kfree_skb_any(new_skb);
+
+ return 0;
}

void cpsw_split_res(struct cpsw_common *cpsw)
@@ -605,7 +608,8 @@ static int cpsw_tx_mq_poll(struct napi_struct *napi_tx, int budget)
else
cur_budget = txv->budget;

- num_tx += cpdma_chan_process(txv->ch, cur_budget);
+ cpdma_chan_process(txv->ch, &cur_budget);
+ num_tx += cur_budget;
if (num_tx >= budget)
break;
}
@@ -623,7 +627,8 @@ static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget)
struct cpsw_common *cpsw = napi_to_cpsw(napi_tx);
int num_tx;

- num_tx = cpdma_chan_process(cpsw->txv[0].ch, budget);
+ num_tx = budget;
+ cpdma_chan_process(cpsw->txv[0].ch, &num_tx);
if (num_tx < budget) {
napi_complete(napi_tx);
writel(0xff, &cpsw->wr_regs->tx_en);
@@ -655,7 +660,8 @@ static int cpsw_rx_mq_poll(struct napi_struct *napi_rx, int budget)
else
cur_budget = rxv->budget;

- num_rx += cpdma_chan_process(rxv->ch, cur_budget);
+ cpdma_chan_process(rxv->ch, &cur_budget);
+ num_rx += cur_budget;
if (num_rx >= budget)
break;
}
@@ -673,7 +679,8 @@ static int cpsw_rx_poll(struct napi_struct *napi_rx, int budget)
struct cpsw_common *cpsw = napi_to_cpsw(napi_rx);
int num_rx;

- num_rx = cpdma_chan_process(cpsw->rxv[0].ch, budget);
+ num_rx = budget;
+ cpdma_chan_process(cpsw->rxv[0].ch, &num_rx);
if (num_rx < budget) {
napi_complete_done(napi_rx, num_rx);
writel(0xff, &cpsw->wr_regs->rx_en);
diff --git a/drivers/net/ethernet/ti/cpsw_ethtool.c b/drivers/net/ethernet/ti/cpsw_ethtool.c
index 3d5ae3fa5a8f..94f8f5ab46a5 100644
--- a/drivers/net/ethernet/ti/cpsw_ethtool.c
+++ b/drivers/net/ethernet/ti/cpsw_ethtool.c
@@ -538,8 +538,8 @@ static int cpsw_update_channels_res(struct cpsw_priv *priv, int ch_num, int rx,
cpdma_handler_fn rx_handler)
{
struct cpsw_common *cpsw = priv->cpsw;
- void (*handler)(void *, int, int);
struct netdev_queue *queue;
+ cpdma_handler_fn handler;
struct cpsw_vector *vec;
int ret, *ch, vch;

diff --git a/drivers/net/ethernet/ti/cpsw_priv.h b/drivers/net/ethernet/ti/cpsw_priv.h
index 04795b97ee71..2ecb3af59fe9 100644
--- a/drivers/net/ethernet/ti/cpsw_priv.h
+++ b/drivers/net/ethernet/ti/cpsw_priv.h
@@ -390,7 +390,7 @@ void cpsw_split_res(struct cpsw_common *cpsw);
int cpsw_fill_rx_channels(struct cpsw_priv *priv);
void cpsw_intr_enable(struct cpsw_common *cpsw);
void cpsw_intr_disable(struct cpsw_common *cpsw);
-void cpsw_tx_handler(void *token, int len, int status);
+int cpsw_tx_handler(void *token, int len, int status);

/* ethtool */
u32 cpsw_get_msglevel(struct net_device *ndev);
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index 7f89b2299f05..a59011d315d5 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -1137,15 +1137,16 @@ bool cpdma_check_free_tx_desc(struct cpdma_chan *chan)
return free_tx_desc;
}

-static void __cpdma_chan_free(struct cpdma_chan *chan,
- struct cpdma_desc __iomem *desc,
- int outlen, int status)
+static int __cpdma_chan_free(struct cpdma_chan *chan,
+ struct cpdma_desc __iomem *desc, int outlen,
+ int status)
{
struct cpdma_ctlr *ctlr = chan->ctlr;
struct cpdma_desc_pool *pool = ctlr->pool;
dma_addr_t buff_dma;
int origlen;
uintptr_t token;
+ int ret;

token = desc_read(desc, sw_token);
origlen = desc_read(desc, sw_len);
@@ -1160,14 +1161,16 @@ static void __cpdma_chan_free(struct cpdma_chan *chan,
}

cpdma_desc_free(pool, desc, 1);
- (*chan->handler)((void *)token, outlen, status);
+ ret = (*chan->handler)((void *)token, outlen, status);
+
+ return ret;
}

static int __cpdma_chan_process(struct cpdma_chan *chan)
{
+ int status, outlen, ret;
struct cpdma_ctlr *ctlr = chan->ctlr;
struct cpdma_desc __iomem *desc;
- int status, outlen;
int cb_status = 0;
struct cpdma_desc_pool *pool = ctlr->pool;
dma_addr_t desc_dma;
@@ -1178,7 +1181,7 @@ static int __cpdma_chan_process(struct cpdma_chan *chan)
desc = chan->head;
if (!desc) {
chan->stats.empty_dequeue++;
- status = -ENOENT;
+ ret = -ENOENT;
goto unlock_ret;
}
desc_dma = desc_phys(pool, desc);
@@ -1187,7 +1190,7 @@ static int __cpdma_chan_process(struct cpdma_chan *chan)
outlen = status & 0x7ff;
if (status & CPDMA_DESC_OWNER) {
chan->stats.busy_dequeue++;
- status = -EBUSY;
+ ret = -EBUSY;
goto unlock_ret;
}

@@ -1213,28 +1216,31 @@ static int __cpdma_chan_process(struct cpdma_chan *chan)
else
cb_status = status;

- __cpdma_chan_free(chan, desc, outlen, cb_status);
- return status;
+ ret = __cpdma_chan_free(chan, desc, outlen, cb_status);
+ return ret;

unlock_ret:
spin_unlock_irqrestore(&chan->lock, flags);
- return status;
+ return ret;
}

-int cpdma_chan_process(struct cpdma_chan *chan, int quota)
+int cpdma_chan_process(struct cpdma_chan *chan, int *quota)
{
- int used = 0, ret = 0;
+ int used = 0, ret = 0, res = 0;

if (chan->state != CPDMA_STATE_ACTIVE)
return -EINVAL;

- while (used < quota) {
+ while (used < *quota) {
ret = __cpdma_chan_process(chan);
if (ret < 0)
break;
+ res |= ret;
used++;
}
- return used;
+
+ *quota = used;
+ return res;
}

int cpdma_chan_start(struct cpdma_chan *chan)
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.h b/drivers/net/ethernet/ti/davinci_cpdma.h
index 8f6f27185c63..56543d375923 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.h
+++ b/drivers/net/ethernet/ti/davinci_cpdma.h
@@ -61,7 +61,7 @@ struct cpdma_chan_stats {
struct cpdma_ctlr;
struct cpdma_chan;

-typedef void (*cpdma_handler_fn)(void *token, int len, int status);
+typedef int (*cpdma_handler_fn)(void *token, int len, int status);

struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
@@ -81,7 +81,7 @@ int cpdma_chan_submit_mapped(struct cpdma_chan *chan, void *token,
dma_addr_t data, int len, int directed);
int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
int len, int directed);
-int cpdma_chan_process(struct cpdma_chan *chan, int quota);
+int cpdma_chan_process(struct cpdma_chan *chan, int *quota);

int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable);
void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value);
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 4bf65cab79e6..3592690b8dd8 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -860,7 +860,7 @@ static struct sk_buff *emac_rx_alloc(struct emac_priv *priv)
return skb;
}

-static void emac_rx_handler(void *token, int len, int status)
+static int emac_rx_handler(void *token, int len, int status)
{
struct sk_buff *skb = token;
struct net_device *ndev = skb->dev;
@@ -871,7 +871,7 @@ static void emac_rx_handler(void *token, int len, int status)
/* free and bail if we are shutting down */
if (unlikely(!netif_running(ndev))) {
dev_kfree_skb_any(skb);
- return;
+ return 0;
}

/* recycle on receive error */
@@ -892,7 +892,7 @@ static void emac_rx_handler(void *token, int len, int status)
if (!skb) {
if (netif_msg_rx_err(priv) && net_ratelimit())
dev_err(emac_dev, "failed rx buffer alloc\n");
- return;
+ return 0;
}

recycle:
@@ -902,9 +902,11 @@ static void emac_rx_handler(void *token, int len, int status)
WARN_ON(ret == -ENOMEM);
if (unlikely(ret < 0))
dev_kfree_skb_any(skb);
+
+ return 0;
}

-static void emac_tx_handler(void *token, int len, int status)
+static int emac_tx_handler(void *token, int len, int status)
{
struct sk_buff *skb = token;
struct net_device *ndev = skb->dev;
@@ -917,6 +919,7 @@ static void emac_tx_handler(void *token, int len, int status)
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += len;
dev_kfree_skb_any(skb);
+ return 0;
}

/**
@@ -1237,8 +1240,8 @@ static int emac_poll(struct napi_struct *napi, int budget)
mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;

if (status & mask) {
- num_tx_pkts = cpdma_chan_process(priv->txchan,
- EMAC_DEF_TX_MAX_SERVICE);
+ num_tx_pkts = EMAC_DEF_TX_MAX_SERVICE;
+ cpdma_chan_process(priv->txchan, &num_tx_pkts);
} /* TX processing */

mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
@@ -1247,7 +1250,8 @@ static int emac_poll(struct napi_struct *napi, int budget)
mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;

if (status & mask) {
- num_rx_pkts = cpdma_chan_process(priv->rxchan, budget);
+ num_rx_pkts = budget;
+ cpdma_chan_process(priv->rxchan, &num_rx_pkts);
} /* RX processing */

mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
--
2.17.1
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