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// SPDX-License-Identifier: GPL-2.0+
/* Microchip Sparx5 Switch driver
*
* Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
*/
#include "sparx5_main_regs.h"
#include "sparx5_main.h"
#define XTR_EOF_0 ntohl((__force __be32)0x80000000u)
#define XTR_EOF_1 ntohl((__force __be32)0x80000001u)
#define XTR_EOF_2 ntohl((__force __be32)0x80000002u)
#define XTR_EOF_3 ntohl((__force __be32)0x80000003u)
#define XTR_PRUNED ntohl((__force __be32)0x80000004u)
#define XTR_ABORT ntohl((__force __be32)0x80000005u)
#define XTR_ESCAPE ntohl((__force __be32)0x80000006u)
#define XTR_NOT_READY ntohl((__force __be32)0x80000007u)
#define XTR_VALID_BYTES(x) (4 - ((x) & 3))
#define INJ_TIMEOUT_NS 50000
struct frame_info {
int src_port;
};
static void sparx5_xtr_flush(struct sparx5 *sparx5, u8 grp)
{
/* Start flush */
spx5_wr(QS_XTR_FLUSH_FLUSH_SET(BIT(grp)), sparx5, QS_XTR_FLUSH);
/* Allow to drain */
mdelay(1);
/* All Queues normal */
spx5_wr(0, sparx5, QS_XTR_FLUSH);
}
static void sparx5_ifh_parse(u32 *ifh, struct frame_info *info)
{
u8 *xtr_hdr = (u8 *)ifh;
/* FWD is bit 45-72 (28 bits), but we only read the 27 LSB for now */
u32 fwd =
((u32)xtr_hdr[27] << 24) |
((u32)xtr_hdr[28] << 16) |
((u32)xtr_hdr[29] << 8) |
((u32)xtr_hdr[30] << 0);
fwd = (fwd >> 5);
info->src_port = FIELD_GET(GENMASK(7, 1), fwd);
}
static void sparx5_xtr_grp(struct sparx5 *sparx5, u8 grp, bool byte_swap)
{
bool eof_flag = false, pruned_flag = false, abort_flag = false;
struct net_device *netdev;
struct sparx5_port *port;
struct frame_info fi;
int i, byte_cnt = 0;
struct sk_buff *skb;
u32 ifh[IFH_LEN];
u32 *rxbuf;
/* Get IFH */
for (i = 0; i < IFH_LEN; i++)
ifh[i] = spx5_rd(sparx5, QS_XTR_RD(grp));
/* Decode IFH (whats needed) */
sparx5_ifh_parse(ifh, &fi);
/* Map to port netdev */
port = fi.src_port < SPX5_PORTS ?
sparx5->ports[fi.src_port] : NULL;
if (!port || !port->ndev) {
dev_err(sparx5->dev, "Data on inactive port %d\n", fi.src_port);
sparx5_xtr_flush(sparx5, grp);
return;
}
/* Have netdev, get skb */
netdev = port->ndev;
skb = netdev_alloc_skb(netdev, netdev->mtu + ETH_HLEN);
if (!skb) {
sparx5_xtr_flush(sparx5, grp);
dev_err(sparx5->dev, "No skb allocated\n");
netdev->stats.rx_dropped++;
return;
}
rxbuf = (u32 *)skb->data;
/* Now, pull frame data */
while (!eof_flag) {
u32 val = spx5_rd(sparx5, QS_XTR_RD(grp));
u32 cmp = val;
if (byte_swap)
cmp = ntohl((__force __be32)val);
switch (cmp) {
case XTR_NOT_READY:
break;
case XTR_ABORT:
/* No accompanying data */
abort_flag = true;
eof_flag = true;
break;
case XTR_EOF_0:
case XTR_EOF_1:
case XTR_EOF_2:
case XTR_EOF_3:
/* This assumes STATUS_WORD_POS == 1, Status
* just after last data
*/
byte_cnt -= (4 - XTR_VALID_BYTES(val));
eof_flag = true;
break;
case XTR_PRUNED:
/* But get the last 4 bytes as well */
eof_flag = true;
pruned_flag = true;
fallthrough;
case XTR_ESCAPE:
*rxbuf = spx5_rd(sparx5, QS_XTR_RD(grp));
byte_cnt += 4;
rxbuf++;
break;
default:
*rxbuf = val;
byte_cnt += 4;
rxbuf++;
}
}
if (abort_flag || pruned_flag || !eof_flag) {
netdev_err(netdev, "Discarded frame: abort:%d pruned:%d eof:%d\n",
abort_flag, pruned_flag, eof_flag);
kfree_skb(skb);
netdev->stats.rx_dropped++;
return;
}
/* Everything we see on an interface that is in the HW bridge
* has already been forwarded
*/
if (test_bit(port->portno, sparx5->bridge_mask))
skb->offload_fwd_mark = 1;
/* Finish up skb */
skb_put(skb, byte_cnt - ETH_FCS_LEN);
eth_skb_pad(skb);
skb->protocol = eth_type_trans(skb, netdev);
netif_rx(skb);
netdev->stats.rx_bytes += skb->len;
netdev->stats.rx_packets++;
}
static int sparx5_inject(struct sparx5 *sparx5,
u32 *ifh,
struct sk_buff *skb,
struct net_device *ndev)
{
int grp = INJ_QUEUE;
u32 val, w, count;
u8 *buf;
val = spx5_rd(sparx5, QS_INJ_STATUS);
if (!(QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp))) {
pr_err_ratelimited("Injection: Queue not ready: 0x%lx\n",
QS_INJ_STATUS_FIFO_RDY_GET(val));
return -EBUSY;
}
/* Indicate SOF */
spx5_wr(QS_INJ_CTRL_SOF_SET(1) |
QS_INJ_CTRL_GAP_SIZE_SET(1),
sparx5, QS_INJ_CTRL(grp));
/* Write the IFH to the chip. */
for (w = 0; w < IFH_LEN; w++)
spx5_wr(ifh[w], sparx5, QS_INJ_WR(grp));
/* Write words, round up */
count = DIV_ROUND_UP(skb->len, 4);
buf = skb->data;
for (w = 0; w < count; w++, buf += 4) {
val = get_unaligned((const u32 *)buf);
spx5_wr(val, sparx5, QS_INJ_WR(grp));
}
/* Add padding */
while (w < (60 / 4)) {
spx5_wr(0, sparx5, QS_INJ_WR(grp));
w++;
}
/* Indicate EOF and valid bytes in last word */
spx5_wr(QS_INJ_CTRL_GAP_SIZE_SET(1) |
QS_INJ_CTRL_VLD_BYTES_SET(skb->len < 60 ? 0 : skb->len % 4) |
QS_INJ_CTRL_EOF_SET(1),
sparx5, QS_INJ_CTRL(grp));
/* Add dummy CRC */
spx5_wr(0, sparx5, QS_INJ_WR(grp));
w++;
val = spx5_rd(sparx5, QS_INJ_STATUS);
if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
struct sparx5_port *port = netdev_priv(ndev);
pr_err_ratelimited("Injection: Watermark reached: 0x%lx\n",
QS_INJ_STATUS_WMARK_REACHED_GET(val));
netif_stop_queue(ndev);
hrtimer_start(&port->inj_timer, INJ_TIMEOUT_NS,
HRTIMER_MODE_REL);
}
return NETDEV_TX_OK;
}
int sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = &dev->stats;
struct sparx5_port *port = netdev_priv(dev);
struct sparx5 *sparx5 = port->sparx5;
int ret;
ret = sparx5_inject(sparx5, port->ifh, skb, dev);
if (ret == NETDEV_TX_OK) {
stats->tx_bytes += skb->len;
stats->tx_packets++;
skb_tx_timestamp(skb);
dev_kfree_skb_any(skb);
} else {
stats->tx_dropped++;
}
return ret;
}
static enum hrtimer_restart sparx5_injection_timeout(struct hrtimer *tmr)
{
struct sparx5_port *port = container_of(tmr, struct sparx5_port,
inj_timer);
int grp = INJ_QUEUE;
u32 val;
val = spx5_rd(port->sparx5, QS_INJ_STATUS);
if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
pr_err_ratelimited("Injection: Reset watermark count\n");
/* Reset Watermark count to restart */
spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
port->sparx5,
DSM_DEV_TX_STOP_WM_CFG(port->portno));
}
netif_wake_queue(port->ndev);
return HRTIMER_NORESTART;
}
int sparx5_manual_injection_mode(struct sparx5 *sparx5)
{
const int byte_swap = 1;
int portno;
/* Change mode to manual extraction and injection */
spx5_wr(QS_XTR_GRP_CFG_MODE_SET(1) |
QS_XTR_GRP_CFG_STATUS_WORD_POS_SET(1) |
QS_XTR_GRP_CFG_BYTE_SWAP_SET(byte_swap),
sparx5, QS_XTR_GRP_CFG(XTR_QUEUE));
spx5_wr(QS_INJ_GRP_CFG_MODE_SET(1) |
QS_INJ_GRP_CFG_BYTE_SWAP_SET(byte_swap),
sparx5, QS_INJ_GRP_CFG(INJ_QUEUE));
/* CPU ports capture setup */
for (portno = SPX5_PORT_CPU_0; portno <= SPX5_PORT_CPU_1; portno++) {
/* ASM CPU port: No preamble, IFH, enable padding */
spx5_wr(ASM_PORT_CFG_PAD_ENA_SET(1) |
ASM_PORT_CFG_NO_PREAMBLE_ENA_SET(1) |
ASM_PORT_CFG_INJ_FORMAT_CFG_SET(1), /* 1 = IFH */
sparx5, ASM_PORT_CFG(portno));
/* Reset WM cnt to unclog queued frames */
spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
sparx5,
DSM_DEV_TX_STOP_WM_CFG(portno));
/* Set Disassembler Stop Watermark level */
spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM_SET(0),
DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM,
sparx5,
DSM_DEV_TX_STOP_WM_CFG(portno));
/* Enable Disassembler buffer underrun watchdog
*/
spx5_rmw(DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS_SET(0),
DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS,
sparx5,
DSM_BUF_CFG(portno));
}
return 0;
}
irqreturn_t sparx5_xtr_handler(int irq, void *_sparx5)
{
struct sparx5 *s5 = _sparx5;
int poll = 64;
/* Check data in queue */
while (spx5_rd(s5, QS_XTR_DATA_PRESENT) & BIT(XTR_QUEUE) && poll-- > 0)
sparx5_xtr_grp(s5, XTR_QUEUE, false);
return IRQ_HANDLED;
}
void sparx5_port_inj_timer_setup(struct sparx5_port *port)
{
hrtimer_init(&port->inj_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
port->inj_timer.function = sparx5_injection_timeout;
}
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