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can: mcp251xfd: add BQL support 

This patch adds BQL support to the driver. Support for netdev_xmit_more() will
be added in a separate patch series.

Link: https://lore.kernel.org/r/20210114153448.1506901-7-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
master
Marc Kleine-Budde 2020-12-13 17:25:15 +01:00
parent 86f1e3b1dd
commit 4162e18e94
1 changed files with 17 additions and 4 deletions
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21
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
View File

@ -335,6 +335,8 @@ static void mcp251xfd_ring_init(struct mcp251xfd_priv *priv)
u8 len;
int i, j;
netdev_reset_queue(priv->ndev);
/* TEF */
tef_ring = priv->tef;
tef_ring->head = 0;
@ -1249,7 +1251,8 @@ mcp251xfd_handle_tefif_recover(const struct mcp251xfd_priv *priv, const u32 seq)
static int
mcp251xfd_handle_tefif_one(struct mcp251xfd_priv *priv,
const struct mcp251xfd_hw_tef_obj *hw_tef_obj)
const struct mcp251xfd_hw_tef_obj *hw_tef_obj,
unsigned int *frame_len_ptr)
{
struct net_device_stats *stats = &priv->ndev->stats;
u32 seq, seq_masked, tef_tail_masked;
@ -1271,7 +1274,8 @@ mcp251xfd_handle_tefif_one(struct mcp251xfd_priv *priv,
stats->tx_bytes +=
can_rx_offload_get_echo_skb(&priv->offload,
mcp251xfd_get_tef_tail(priv),
hw_tef_obj->ts, NULL);
hw_tef_obj->ts,
frame_len_ptr);
stats->tx_packets++;
priv->tef->tail++;
@ -1329,6 +1333,7 @@ mcp251xfd_tef_obj_read(const struct mcp251xfd_priv *priv,
static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
{
struct mcp251xfd_hw_tef_obj hw_tef_obj[MCP251XFD_TX_OBJ_NUM_MAX];
unsigned int total_frame_len = 0;
u8 tef_tail, len, l;
int err, i;
@ -1350,7 +1355,9 @@ static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
}
for (i = 0; i < len; i++) {
err = mcp251xfd_handle_tefif_one(priv, &hw_tef_obj[i]);
unsigned int frame_len;
err = mcp251xfd_handle_tefif_one(priv, &hw_tef_obj[i], &frame_len);
/* -EAGAIN means the Sequence Number in the TEF
* doesn't match our tef_tail. This can happen if we
* read the TEF objects too early. Leave loop let the
@ -1360,6 +1367,8 @@ static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
goto out_netif_wake_queue;
if (err)
return err;
total_frame_len += frame_len;
}
out_netif_wake_queue:
@ -1390,6 +1399,7 @@ static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
return err;
tx_ring->tail += len;
netdev_completed_queue(priv->ndev, len, total_frame_len);
err = mcp251xfd_check_tef_tail(priv);
if (err)
@ -2435,6 +2445,7 @@ static netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb,
struct mcp251xfd_priv *priv = netdev_priv(ndev);
struct mcp251xfd_tx_ring *tx_ring = priv->tx;
struct mcp251xfd_tx_obj *tx_obj;
unsigned int frame_len;
u8 tx_head;
int err;
@ -2453,7 +2464,9 @@ static netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb,
if (mcp251xfd_get_tx_free(tx_ring) == 0)
netif_stop_queue(ndev);
can_put_echo_skb(skb, ndev, tx_head, 0);
frame_len = can_skb_get_frame_len(skb);
can_put_echo_skb(skb, ndev, tx_head, frame_len);
netdev_sent_queue(priv->ndev, frame_len);
err = mcp251xfd_tx_obj_write(priv, tx_obj);
if (err)