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Message-Id: <1622249601-7106-7-git-send-email-michael.chan@broadcom.com>
Date: Fri, 28 May 2021 20:53:20 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
richardcochran@...il.com, pavan.chebbi@...adcom.com,
edwin.peer@...adcom.com
Subject: [PATCH net-next 6/7] bnxt_en: Transmit and retrieve packet timestamps.
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
Setup the TXBD to enable TX timestamp if requested. At TX packet DMA
completion, if we requested TX timestamp on that packet, we defer to a
worqueue to obtain the TX timestamp from the firmware before we free
the TX SKB.
Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 38 ++++++++--
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 +
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 70 +++++++++++++++++++
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 2 +
4 files changed, 107 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 1fbfc0326dda..00dbc2d6c33b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -421,12 +421,25 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
vlan_tag_flags |= 1 << TX_BD_CFA_META_TPID_SHIFT;
}
- if (unlikely(skb->no_fcs)) {
- lflags |= cpu_to_le32(TX_BD_FLAGS_NO_CRC);
- goto normal_tx;
+ if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
+ struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+
+ if (ptp && ptp->tx_tstamp_en && !skb_is_gso(skb) &&
+ atomic_dec_if_positive(&ptp->tx_avail) >= 0) {
+ if (!bnxt_ptp_parse(skb, &ptp->tx_seqid)) {
+ lflags |= cpu_to_le32(TX_BD_FLAGS_STAMP);
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+ } else {
+ atomic_inc(&bp->ptp_cfg->tx_avail);
+ }
+ }
}
- if (free_size == bp->tx_ring_size && length <= bp->tx_push_thresh) {
+ if (unlikely(skb->no_fcs))
+ lflags |= cpu_to_le32(TX_BD_FLAGS_NO_CRC);
+
+ if (free_size == bp->tx_ring_size && length <= bp->tx_push_thresh &&
+ !lflags) {
struct tx_push_buffer *tx_push_buf = txr->tx_push;
struct tx_push_bd *tx_push = &tx_push_buf->push_bd;
struct tx_bd_ext *tx_push1 = &tx_push->txbd2;
@@ -593,6 +606,8 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
netdev_tx_sent_queue(txq, skb->len);
+ skb_tx_timestamp(skb);
+
/* Sync BD data before updating doorbell */
wmb();
@@ -622,6 +637,9 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
tx_dma_error:
+ if (BNXT_TX_PTP_IS_SET(lflags))
+ atomic_inc(&bp->ptp_cfg->tx_avail);
+
last_frag = i;
/* start back at beginning and unmap skb */
@@ -656,6 +674,7 @@ static void bnxt_tx_int(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
for (i = 0; i < nr_pkts; i++) {
struct bnxt_sw_tx_bd *tx_buf;
+ bool compl_deferred = false;
struct sk_buff *skb;
int j, last;
@@ -682,12 +701,21 @@ static void bnxt_tx_int(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
skb_frag_size(&skb_shinfo(skb)->frags[j]),
PCI_DMA_TODEVICE);
}
+ if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) {
+ if (bp->flags & BNXT_FLAG_CHIP_P5) {
+ if (!bnxt_get_tx_ts_p5(bp, skb))
+ compl_deferred = true;
+ else
+ atomic_inc(&bp->ptp_cfg->tx_avail);
+ }
+ }
next_tx_int:
cons = NEXT_TX(cons);
tx_bytes += skb->len;
- dev_kfree_skb_any(skb);
+ if (!compl_deferred)
+ dev_kfree_skb_any(skb);
}
netdev_tx_completed_queue(txq, nr_pkts, tx_bytes);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index dbefa77279ef..b6f95799a214 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -89,6 +89,8 @@ struct tx_bd_ext {
#define TX_BD_CFA_META_KEY_VLAN (1 << 28)
};
+#define BNXT_TX_PTP_IS_SET(lflags) ((lflags) & cpu_to_le32(TX_BD_FLAGS_STAMP))
+
struct rx_bd {
__le32 rx_bd_len_flags_type;
#define RX_BD_TYPE (0x3f << 0)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index 538b3c8f97f1..ccd7ed6d2296 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -15,10 +15,32 @@
#include <linux/net_tstamp.h>
#include <linux/timecounter.h>
#include <linux/timekeeping.h>
+#include <linux/ptp_classify.h>
#include "bnxt_hsi.h"
#include "bnxt.h"
#include "bnxt_ptp.h"
+int bnxt_ptp_parse(struct sk_buff *skb, u16 *seq_id)
+{
+ unsigned int ptp_class;
+ struct ptp_header *hdr;
+
+ ptp_class = ptp_classify_raw(skb);
+
+ switch (ptp_class & PTP_CLASS_VMASK) {
+ case PTP_CLASS_V1:
+ case PTP_CLASS_V2:
+ hdr = ptp_parse_header(skb, ptp_class);
+ if (!hdr)
+ return -EINVAL;
+
+ *seq_id = ntohs(hdr->sequence_id);
+ return 0;
+ default:
+ return -ERANGE;
+ }
+}
+
static int bnxt_ptp_settime(struct ptp_clock_info *ptp_info,
const struct timespec64 *ts)
{
@@ -247,6 +269,48 @@ static u64 bnxt_cc_read(const struct cyclecounter *cc)
return ns;
}
+static void bnxt_ptp_ts_task(struct work_struct *work)
+{
+ struct bnxt_ptp_cfg *ptp = container_of(work, struct bnxt_ptp_cfg,
+ ptp_ts_task);
+ u32 flags = PORT_TS_QUERY_REQ_FLAGS_PATH_TX;
+ struct skb_shared_hwtstamps timestamp;
+ struct bnxt *bp = ptp->bp;
+ u64 ts = 0, ns = 0;
+ int rc;
+
+ if (!ptp->tx_skb)
+ return;
+
+ rc = bnxt_hwrm_port_ts_query(bp, flags, &ts, NULL);
+ if (!rc) {
+ memset(×tamp, 0, sizeof(timestamp));
+ ns = timecounter_cyc2time(&ptp->tc, ts);
+ timestamp.hwtstamp = ns_to_ktime(ns);
+ skb_tstamp_tx(ptp->tx_skb, ×tamp);
+ } else {
+ netdev_err(bp->dev, "TS query for TX timer failed rc = %x\n",
+ rc);
+ }
+
+ dev_kfree_skb_any(ptp->tx_skb);
+ ptp->tx_skb = NULL;
+ atomic_inc(&bp->ptp_cfg->tx_avail);
+}
+
+int bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb)
+{
+ struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+
+ if (ptp->tx_skb) {
+ netdev_err(bp->dev, "deferring skb:one SKB is still outstanding\n");
+ return -EBUSY;
+ }
+ ptp->tx_skb = skb;
+ schedule_work(&ptp->ptp_ts_task);
+ return 0;
+}
+
int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 *ts, u32 pkt_ts)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
@@ -319,6 +383,7 @@ int bnxt_ptp_init(struct bnxt *bp)
if (IS_ERR(ptp->ptp_clock))
ptp->ptp_clock = NULL;
+ INIT_WORK(&ptp->ptp_ts_task, bnxt_ptp_ts_task);
return 0;
}
@@ -333,4 +398,9 @@ void bnxt_ptp_clear(struct bnxt *bp)
ptp_clock_unregister(ptp->ptp_clock);
ptp->ptp_clock = NULL;
+ cancel_work_sync(&ptp->ptp_ts_task);
+ if (ptp->tx_skb) {
+ dev_kfree_skb_any(ptp->tx_skb);
+ ptp->tx_skb = NULL;
+ }
}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
index 3bea71111231..ca5bd53bcf8c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
@@ -50,9 +50,11 @@ struct bnxt_ptp_cfg {
int rx_filter;
};
+int bnxt_ptp_parse(struct sk_buff *skb, u16 *seq_id);
int bnxt_ptp_get_current_time(struct bnxt *bp);
int bnxt_hwtstamp_set(struct net_device *dev, struct ifreq *ifr);
int bnxt_hwtstamp_get(struct net_device *dev, struct ifreq *ifr);
+int bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb);
int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 *ts, u32 pkt_ts);
int bnxt_ptp_start(struct bnxt *bp);
int bnxt_ptp_init(struct bnxt *bp);
--
2.18.1
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