Commit 3cbc3a0f authored by Sergey Matyukevich's avatar Sergey Matyukevich Committed by Kalle Valo

qtnfmac: switch to kernel circ_buf implementation

Current code for both Rx and Tx queue management is a custom and incomplete
circular buffer implementation. It makes a lot of sense to switch to kernel
built-in circ_buf implementation.
Signed-off-by: default avatarSergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent dfb13db6
......@@ -25,6 +25,7 @@
#include <linux/completion.h>
#include <linux/crc32.h>
#include <linux/spinlock.h>
#include <linux/circ_buf.h>
#include "qtn_hw_ids.h"
#include "pcie_bus_priv.h"
......@@ -44,10 +45,6 @@ static unsigned int rx_bd_size_param = 256;
module_param(rx_bd_size_param, uint, 0644);
MODULE_PARM_DESC(rx_bd_size_param, "Rx descriptors queue size");
static unsigned int rx_bd_reserved_param = 16;
module_param(rx_bd_reserved_param, uint, 0644);
MODULE_PARM_DESC(rx_bd_reserved_param, "Reserved RX descriptors");
static u8 flashboot = 1;
module_param(flashboot, byte, 0644);
MODULE_PARM_DESC(flashboot, "set to 0 to use FW binary file on FS");
......@@ -392,9 +389,8 @@ static int alloc_bd_table(struct qtnf_pcie_bus_priv *priv)
pr_debug("TX descriptor table: vaddr=0x%p paddr=%pad\n", vaddr, &paddr);
priv->tx_bd_reclaim_start = 0;
priv->tx_bd_index = 0;
priv->tx_queue_len = 0;
priv->tx_bd_r_index = 0;
priv->tx_bd_w_index = 0;
/* rx bd */
......@@ -413,8 +409,6 @@ static int alloc_bd_table(struct qtnf_pcie_bus_priv *priv)
pr_debug("RX descriptor table: vaddr=0x%p paddr=%pad\n", vaddr, &paddr);
priv->rx_bd_index = 0;
return 0;
}
......@@ -445,6 +439,8 @@ static int skb2rbd_attach(struct qtnf_pcie_bus_priv *priv, u16 index)
rxbd->addr_h = cpu_to_le32(QTN_HOST_HI32(paddr));
rxbd->info = 0x0;
priv->rx_bd_w_index = index;
/* sync up all descriptor updates */
wmb();
......@@ -510,6 +506,8 @@ static int qtnf_pcie_init_xfer(struct qtnf_pcie_bus_priv *priv)
priv->tx_bd_num = tx_bd_size_param;
priv->rx_bd_num = rx_bd_size_param;
priv->rx_bd_w_index = 0;
priv->rx_bd_r_index = 0;
ret = alloc_skb_array(priv);
if (ret) {
......@@ -532,29 +530,29 @@ static int qtnf_pcie_init_xfer(struct qtnf_pcie_bus_priv *priv)
return ret;
}
static int qtnf_pcie_data_tx_reclaim(struct qtnf_pcie_bus_priv *priv)
static void qtnf_pcie_data_tx_reclaim(struct qtnf_pcie_bus_priv *priv)
{
struct qtnf_tx_bd *txbd;
struct sk_buff *skb;
dma_addr_t paddr;
int last_sent;
int count;
u32 tx_done_index;
int count = 0;
int i;
last_sent = readl(PCIE_HDP_RX0DMA_CNT(priv->pcie_reg_base))
% priv->tx_bd_num;
i = priv->tx_bd_reclaim_start;
count = 0;
while (i != last_sent) {
skb = priv->tx_skb[i];
if (!skb)
break;
tx_done_index = readl(PCIE_HDP_RX0DMA_CNT(priv->pcie_reg_base))
& (priv->tx_bd_num - 1);
i = priv->tx_bd_r_index;
while (CIRC_CNT(tx_done_index, i, priv->tx_bd_num)) {
skb = priv->tx_skb[i];
if (likely(skb)) {
txbd = &priv->tx_bd_vbase[i];
paddr = QTN_HOST_ADDR(le32_to_cpu(txbd->addr_h),
le32_to_cpu(txbd->addr));
pci_unmap_single(priv->pdev, paddr, skb->len, PCI_DMA_TODEVICE);
pci_unmap_single(priv->pdev, paddr, skb->len,
PCI_DMA_TODEVICE);
if (skb->dev) {
skb->dev->stats.tx_packets++;
......@@ -565,34 +563,36 @@ static int qtnf_pcie_data_tx_reclaim(struct qtnf_pcie_bus_priv *priv)
}
dev_kfree_skb_any(skb);
}
priv->tx_skb[i] = NULL;
priv->tx_queue_len--;
count++;
if (++i >= priv->tx_bd_num)
i = 0;
}
priv->tx_bd_reclaim_start = i;
priv->tx_reclaim_done += count;
priv->tx_reclaim_req++;
priv->tx_bd_r_index = i;
return count;
}
static bool qtnf_tx_queue_ready(struct qtnf_pcie_bus_priv *priv)
static int qtnf_tx_queue_ready(struct qtnf_pcie_bus_priv *priv)
{
if (priv->tx_queue_len >= priv->tx_bd_num - 1) {
if (!CIRC_SPACE(priv->tx_bd_w_index, priv->tx_bd_r_index,
priv->tx_bd_num)) {
pr_err_ratelimited("reclaim full Tx queue\n");
qtnf_pcie_data_tx_reclaim(priv);
if (priv->tx_queue_len >= priv->tx_bd_num - 1) {
if (!CIRC_SPACE(priv->tx_bd_w_index, priv->tx_bd_r_index,
priv->tx_bd_num)) {
priv->tx_full_count++;
return false;
return 0;
}
}
return true;
return 1;
}
static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb)
......@@ -617,7 +617,7 @@ static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb)
return NETDEV_TX_BUSY;
}
i = priv->tx_bd_index;
i = priv->tx_bd_w_index;
priv->tx_skb[i] = skb;
len = skb->len;
......@@ -649,8 +649,7 @@ static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb)
if (++i >= priv->tx_bd_num)
i = 0;
priv->tx_bd_index = i;
priv->tx_queue_len++;
priv->tx_bd_w_index = i;
tx_done:
if (ret && skb) {
......@@ -709,16 +708,19 @@ static irqreturn_t qtnf_interrupt(int irq, void *data)
return IRQ_HANDLED;
}
static inline void hw_txproc_wr_ptr_inc(struct qtnf_pcie_bus_priv *priv)
static int qtnf_rx_data_ready(struct qtnf_pcie_bus_priv *priv)
{
u32 index;
u16 index = priv->rx_bd_r_index;
struct qtnf_rx_bd *rxbd;
u32 descw;
index = priv->hw_txproc_wr_ptr;
rxbd = &priv->rx_bd_vbase[index];
descw = le32_to_cpu(rxbd->info);
if (++index >= priv->rx_bd_num)
index = 0;
if (descw & QTN_TXDONE_MASK)
return 1;
priv->hw_txproc_wr_ptr = index;
return 0;
}
static int qtnf_rx_poll(struct napi_struct *napi, int budget)
......@@ -730,26 +732,52 @@ static int qtnf_rx_poll(struct napi_struct *napi, int budget)
int processed = 0;
struct qtnf_rx_bd *rxbd;
dma_addr_t skb_paddr;
int consume;
u32 descw;
u16 index;
u32 psize;
u16 r_idx;
u16 w_idx;
int ret;
index = priv->rx_bd_index;
rxbd = &priv->rx_bd_vbase[index];
while (processed < budget) {
if (!qtnf_rx_data_ready(priv))
goto rx_out;
r_idx = priv->rx_bd_r_index;
rxbd = &priv->rx_bd_vbase[r_idx];
descw = le32_to_cpu(rxbd->info);
while ((descw & QTN_TXDONE_MASK) && (processed < budget)) {
skb = priv->rx_skb[index];
skb = priv->rx_skb[r_idx];
psize = QTN_GET_LEN(descw);
consume = 1;
if (likely(skb)) {
skb_put(skb, QTN_GET_LEN(descw));
if (!(descw & QTN_TXDONE_MASK)) {
pr_warn("skip invalid rxbd[%d]\n", r_idx);
consume = 0;
}
if (!skb) {
pr_warn("skip missing rx_skb[%d]\n", r_idx);
consume = 0;
}
if (skb && (skb_tailroom(skb) < psize)) {
pr_err("skip packet with invalid length: %u > %u\n",
psize, skb_tailroom(skb));
consume = 0;
}
if (skb) {
skb_paddr = QTN_HOST_ADDR(le32_to_cpu(rxbd->addr_h),
le32_to_cpu(rxbd->addr));
pci_unmap_single(priv->pdev, skb_paddr, SKB_BUF_SIZE,
PCI_DMA_FROMDEVICE);
}
if (consume) {
skb_put(skb, psize);
ndev = qtnf_classify_skb(bus, skb);
if (likely(ndev)) {
ndev->stats.rx_packets++;
......@@ -762,30 +790,38 @@ static int qtnf_rx_poll(struct napi_struct *napi, int budget)
bus->mux_dev.stats.rx_dropped++;
dev_kfree_skb_any(skb);
}
processed++;
} else {
pr_err("missing rx_skb[%d]\n", index);
if (skb) {
bus->mux_dev.stats.rx_dropped++;
dev_kfree_skb_any(skb);
}
}
/* attached rx buffer is passed upstream: map a new one */
ret = skb2rbd_attach(priv, index);
if (likely(!ret)) {
if (++index >= priv->rx_bd_num)
index = 0;
priv->rx_skb[r_idx] = NULL;
if (++r_idx >= priv->rx_bd_num)
r_idx = 0;
priv->rx_bd_index = index;
hw_txproc_wr_ptr_inc(priv);
priv->rx_bd_r_index = r_idx;
rxbd = &priv->rx_bd_vbase[index];
descw = le32_to_cpu(rxbd->info);
} else {
pr_err("failed to allocate new rx_skb[%d]\n", index);
/* repalce processed buffer by a new one */
w_idx = priv->rx_bd_w_index;
while (CIRC_SPACE(priv->rx_bd_w_index, priv->rx_bd_r_index,
priv->rx_bd_num) > 0) {
if (++w_idx >= priv->rx_bd_num)
w_idx = 0;
ret = skb2rbd_attach(priv, w_idx);
if (ret) {
pr_err("failed to allocate new rx_skb[%d]\n",
w_idx);
break;
}
}
processed++;
}
rx_out:
if (processed < budget) {
napi_complete(napi);
qtnf_en_rxdone_irq(priv);
......@@ -1056,10 +1092,18 @@ static int qtnf_dbg_irq_stats(struct seq_file *s, void *data)
{
struct qtnf_bus *bus = dev_get_drvdata(s->private);
struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
u32 reg = readl(PCIE_HDP_INT_EN(priv->pcie_reg_base));
u32 status;
seq_printf(s, "pcie_irq_count(%u)\n", priv->pcie_irq_count);
seq_printf(s, "pcie_irq_tx_count(%u)\n", priv->pcie_irq_tx_count);
status = reg & PCIE_HDP_INT_TX_BITS;
seq_printf(s, "pcie_irq_tx_status(%s)\n",
(status == PCIE_HDP_INT_TX_BITS) ? "EN" : "DIS");
seq_printf(s, "pcie_irq_rx_count(%u)\n", priv->pcie_irq_rx_count);
status = reg & PCIE_HDP_INT_RX_BITS;
seq_printf(s, "pcie_irq_rx_status(%s)\n",
(status == PCIE_HDP_INT_RX_BITS) ? "EN" : "DIS");
return 0;
}
......@@ -1073,10 +1117,24 @@ static int qtnf_dbg_hdp_stats(struct seq_file *s, void *data)
seq_printf(s, "tx_done_count(%u)\n", priv->tx_done_count);
seq_printf(s, "tx_reclaim_done(%u)\n", priv->tx_reclaim_done);
seq_printf(s, "tx_reclaim_req(%u)\n", priv->tx_reclaim_req);
seq_printf(s, "tx_bd_reclaim_start(%u)\n", priv->tx_bd_reclaim_start);
seq_printf(s, "tx_bd_index(%u)\n", priv->tx_bd_index);
seq_printf(s, "rx_bd_index(%u)\n", priv->rx_bd_index);
seq_printf(s, "tx_queue_len(%u)\n", priv->tx_queue_len);
seq_printf(s, "tx_bd_r_index(%u)\n", priv->tx_bd_r_index);
seq_printf(s, "tx_bd_p_index(%u)\n",
readl(PCIE_HDP_RX0DMA_CNT(priv->pcie_reg_base))
& (priv->tx_bd_num - 1));
seq_printf(s, "tx_bd_w_index(%u)\n", priv->tx_bd_w_index);
seq_printf(s, "tx queue len(%u)\n",
CIRC_CNT(priv->tx_bd_w_index, priv->tx_bd_r_index,
priv->tx_bd_num));
seq_printf(s, "rx_bd_r_index(%u)\n", priv->rx_bd_r_index);
seq_printf(s, "rx_bd_p_index(%u)\n",
readl(PCIE_HDP_TX0DMA_CNT(priv->pcie_reg_base))
& (priv->rx_bd_num - 1));
seq_printf(s, "rx_bd_w_index(%u)\n", priv->rx_bd_w_index);
seq_printf(s, "rx alloc queue len(%u)\n",
CIRC_SPACE(priv->rx_bd_w_index, priv->rx_bd_r_index,
priv->rx_bd_num));
return 0;
}
......
......@@ -66,13 +66,11 @@ struct qtnf_pcie_bus_priv {
void *bd_table_vaddr;
u32 bd_table_len;
u32 hw_txproc_wr_ptr;
u32 rx_bd_w_index;
u32 rx_bd_r_index;
u16 tx_bd_reclaim_start;
u16 tx_bd_index;
u32 tx_queue_len;
u16 rx_bd_index;
u32 tx_bd_w_index;
u32 tx_bd_r_index;
u32 pcie_irq_mask;
......
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