@@ -1984,7 +1984,8 @@ static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb)
return fcb;
}
-static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
+static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb,
+ int fcb_length)
{
u8 flags = 0;
@@ -2006,7 +2007,7 @@ static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
* frame (skb->data) and the start of the IP hdr.
* l4os is the distance between the start of the
* l3 hdr and the l4 hdr */
- fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
+ fcb->l3os = (u16)(skb_network_offset(skb) - fcb_length);
fcb->l4os = skb_network_header_len(skb);
fcb->flags = flags;
@@ -2046,7 +2047,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
int i, rq = 0, do_tstamp = 0;
u32 bufaddr;
unsigned long flags;
- unsigned int nr_frags, nr_txbds, length;
+ unsigned int nr_frags, nr_txbds, length, fcb_length = GMAC_FCB_LEN;
/*
* TOE=1 frames larger than 2500 bytes may see excess delays
@@ -2070,22 +2071,37 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* check if time stamp should be generated */
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
- priv->hwts_tx_en))
+ priv->hwts_tx_en)) {
do_tstamp = 1;
+ fcb_length = GMAC_FCB_LEN + GMAC_TXPAL_LEN;
+ }
/* make space for additional header when fcb is needed */
if (((skb->ip_summed == CHECKSUM_PARTIAL) ||
vlan_tx_tag_present(skb) ||
unlikely(do_tstamp)) &&
- (skb_headroom(skb) < GMAC_FCB_LEN)) {
+ (skb_headroom(skb) < fcb_length)) {
struct sk_buff *skb_new;
- skb_new = skb_realloc_headroom(skb, GMAC_FCB_LEN);
+ skb_new = skb_realloc_headroom(skb, fcb_length);
if (!skb_new) {
dev->stats.tx_errors++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
+
+ /* Hold sock reference for processing TX time stamps */
+ if (unlikely(do_tstamp)) {
+ struct sock *sk = skb->sk;
+ if (!atomic_inc_not_zero(&sk->sk_refcnt)) {
+ dev->stats.tx_errors++;
+ kfree_skb(skb_new);
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ skb_new->sk = skb->sk;
+ }
+
kfree_skb(skb);
skb = skb_new;
}
@@ -2154,6 +2170,12 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
lstatus = txbdp_start->lstatus;
}
+ /* Add TxPAL between FCB and frame if required */
+ if (unlikely(do_tstamp)) {
+ skb_push(skb, GMAC_TXPAL_LEN);
+ memset(skb->data, 0, GMAC_TXPAL_LEN);
+ }
+
/* Set up checksumming */
if (CHECKSUM_PARTIAL == skb->ip_summed) {
fcb = gfar_add_fcb(skb);
@@ -2164,7 +2186,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
skb_checksum_help(skb);
} else {
lstatus |= BD_LFLAG(TXBD_TOE);
- gfar_tx_checksum(skb, fcb);
+ gfar_tx_checksum(skb, fcb, fcb_length);
}
}
@@ -2196,9 +2218,9 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
* the full frame length.
*/
if (unlikely(do_tstamp)) {
- txbdp_tstamp->bufPtr = txbdp_start->bufPtr + GMAC_FCB_LEN;
+ txbdp_tstamp->bufPtr = txbdp_start->bufPtr + fcb_length;
txbdp_tstamp->lstatus |= BD_LFLAG(TXBD_READY) |
- (skb_headlen(skb) - GMAC_FCB_LEN);
+ (skb_headlen(skb) - fcb_length);
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | GMAC_FCB_LEN;
} else {
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
@@ -2490,7 +2512,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) {
next = next_txbd(bdp, base, tx_ring_size);
- buflen = next->length + GMAC_FCB_LEN;
+ buflen = next->length + GMAC_FCB_LEN + GMAC_TXPAL_LEN;
} else
buflen = bdp->length;
@@ -2502,6 +2524,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
u64 *ns = (u64*) (((u32)skb->data + 0x10) & ~0x7);
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
shhwtstamps.hwtstamp = ns_to_ktime(*ns);
+ skb_pull(skb, GMAC_FCB_LEN + GMAC_TXPAL_LEN);
skb_tstamp_tx(skb, &shhwtstamps);
bdp->lstatus &= BD_LFLAG(TXBD_WRAP);
bdp = next;
@@ -63,6 +63,9 @@ struct ethtool_rx_list {
/* Length for FCB */
#define GMAC_FCB_LEN 8
+/* Length for TxPAL */
+#define GMAC_TXPAL_LEN 16
+
/* Default padding amount */
#define DEFAULT_PADDING 2
When TX time stamping for PTP messages is enabled on a socket, a time stamp is returned on the socket error queue to the user space application after the frame was transmitted. The transmitted frame is also returned on the error queue so that an application knows to which frame the time stamp belongs. In the current implementation the TxFCB is immediately followed by the frame. Since the eTSEC inserts the TX time stamp 8 bytes after the TxFCB, parts of the frame have been overwritten and an invalid frame was returned on the socket error queue. This patch fixes the described problem by adding additional 16 padding bytes between the TxFCB and the frame for all messages sent from a time stamping enabled socket (other sockets are not affected). Signed-off-by: Manfred Rudigier <manfred.rudigier@omicron.at> --- drivers/net/ethernet/freescale/gianfar.c | 43 +++++++++++++++++++++++------- drivers/net/ethernet/freescale/gianfar.h | 3 ++ 2 files changed, 36 insertions(+), 10 deletions(-)