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gianfar: Add hardware TX timestamping support

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If a packet has the skb_shared_tx->hardware flag set the device is
instructed to generate a TX timestamp and write it back to memory after
the frame is transmitted. During the clean_tx_ring operation the
timestamp will be extracted and copied into the skb_shared_hwtstamps
struct of the skb.

TX timestamping is enabled by setting the tx_type to something else
than HWTSTAMP_TX_OFF with the SIOCSHWTSTAMP ioctl command. It is only
supported by eTSEC devices.

Signed-off-by: Manfred Rudigier <manfred.rudigier@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Manfred Rudigier
2010-04-08 23:10:35 +00:00
committed by David S. Miller
parent cc772ab7cd
commit f0ee7acfcd
2 changed files with 101 additions and 20 deletions
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3
drivers/net/gianfar.h
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@@ -540,7 +540,7 @@ struct txbd8
struct txfcb {
u8 flags;
u8 reserved;
u8 ptp; /* Flag to enable tx timestamping */
u8 l4os; /* Level 4 Header Offset */
u8 l3os; /* Level 3 Header Offset */
u16 phcs; /* Pseudo-header Checksum */
@@ -1105,6 +1105,7 @@ struct gfar_private {
/* HW time stamping enabled flag */
int hwts_rx_en;
int hwts_tx_en;
};
extern unsigned int ftp_rqfpr[MAX_FILER_IDX + 1];