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net: macb: Fix PTP one step sync support

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PTP one step sync packets cannot have CSUM padding and insertion in
SW since time stamp is inserted on the fly by HW.
In addition, ptp4l version 3.0 and above report an error when skb
timestamps are reported for packets that not processed for TX TS
after transmission.
Add a helper to identify PTP one step sync and fix the above two
errors. Add a common mask for PTP header flag field "twoStepflag".
Also reset ptp OSS bit when one step is not selected.

Fixes: ab91f0a9b5 ("net: macb: Add hardware PTP support")
Fixes: 653e92a917 ("net: macb: add support for padding and fcs computation")
Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220518170756.7752-1-harini.katakam@xilinx.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Harini Katakam 2022-05-18 22:37:56 +05:30 committed by Jakub Kicinski
parent d904c8cc03
commit 5cebb40bc9
3 changed files with 42 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/net/ethernet/cadence/macb_main.c
View File

@ -36,6 +36,7 @@
#include <linux/iopoll.h>
#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
#include <linux/ptp_classify.h>
#include <linux/reset.h>
#include "macb.h"
@ -1124,6 +1125,36 @@ static void macb_tx_error_task(struct work_struct *work)
spin_unlock_irqrestore(&bp->lock, flags);
}
static bool ptp_one_step_sync(struct sk_buff *skb)
{
struct ptp_header *hdr;
unsigned int ptp_class;
u8 msgtype;
/* No need to parse packet if PTP TS is not involved */
if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
goto not_oss;
/* Identify and return whether PTP one step sync is being processed */
ptp_class = ptp_classify_raw(skb);
if (ptp_class == PTP_CLASS_NONE)
goto not_oss;
hdr = ptp_parse_header(skb, ptp_class);
if (!hdr)
goto not_oss;
if (hdr->flag_field[0] & PTP_FLAG_TWOSTEP)
goto not_oss;
msgtype = ptp_get_msgtype(hdr, ptp_class);
if (msgtype == PTP_MSGTYPE_SYNC)
return true;
not_oss:
return false;
}
static void macb_tx_interrupt(struct macb_queue *queue)
{
unsigned int tail;
@ -1168,8 +1199,8 @@ static void macb_tx_interrupt(struct macb_queue *queue)
/* First, update TX stats if needed */
if (skb) {
if (unlikely(skb_shinfo(skb)->tx_flags &
SKBTX_HW_TSTAMP) &&
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
!ptp_one_step_sync(skb) &&
gem_ptp_do_txstamp(queue, skb, desc) == 0) {
/* skb now belongs to timestamp buffer
* and will be removed later
@ -1999,7 +2030,8 @@ static unsigned int macb_tx_map(struct macb *bp,
ctrl |= MACB_BF(TX_LSO, lso_ctrl);
ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
if ((bp->dev->features & NETIF_F_HW_CSUM) &&
skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl)
skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl &&
!ptp_one_step_sync(skb))
ctrl |= MACB_BIT(TX_NOCRC);
} else
/* Only set MSS/MFS on payload descriptors
@ -2097,7 +2129,7 @@ static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
if (!(ndev->features & NETIF_F_HW_CSUM) ||
!((*skb)->ip_summed != CHECKSUM_PARTIAL) ||
skb_shinfo(*skb)->gso_size) /* Not available for GSO */
skb_shinfo(*skb)->gso_size || ptp_one_step_sync(*skb))
return 0;
if (padlen <= 0) {

4
drivers/net/ethernet/cadence/macb_ptp.c
View File

@ -470,8 +470,10 @@ int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd)
case HWTSTAMP_TX_ONESTEP_SYNC:
if (gem_ptp_set_one_step_sync(bp, 1) != 0)
return -ERANGE;
fallthrough;
tx_bd_control = TSTAMP_ALL_FRAMES;
break;
case HWTSTAMP_TX_ON:
gem_ptp_set_one_step_sync(bp, 0);
tx_bd_control = TSTAMP_ALL_FRAMES;
break;
default:

3
include/linux/ptp_classify.h
View File

@ -43,6 +43,9 @@
#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */
#define OFF_PTP_SEQUENCE_ID 30
/* PTP header flag fields */
#define PTP_FLAG_TWOSTEP BIT(1)
/* Below defines should actually be removed at some point in time. */
#define IP6_HLEN 40
#define UDP_HLEN 8