#define PTP_V2_VERSION_LENGTH 1
#define PTP_V2_VERSION_OFFSET 29
+#define PTP_V2_UUID_LENGTH 8
+#define PTP_V2_UUID_OFFSET 48
+
/* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2),
* the MC only captures the last six bytes of the clock identity. These values
* reflect those, not the ones used in the standard. The standard permits
unsigned number_readings = (response_length /
MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN);
unsigned i;
- unsigned min;
- unsigned min_set = 0;
unsigned total;
unsigned ngood = 0;
unsigned last_good = 0;
struct efx_ptp_data *ptp = efx->ptp_data;
- bool min_valid = false;
u32 last_sec;
u32 start_sec;
struct timespec delta;
if (number_readings == 0)
return -EAGAIN;
- /* Find minimum value in this set of results, discarding clearly
- * erroneous results.
+ /* Read the set of results and increment stats for any results that
+ * appera to be erroneous.
*/
for (i = 0; i < number_readings; i++) {
efx_ptp_read_timeset(synch_buf, &ptp->timeset[i]);
synch_buf += MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN;
- if (ptp->timeset[i].window > SYNCHRONISATION_GRANULARITY_NS) {
- if (min_valid) {
- if (ptp->timeset[i].window < min_set)
- min_set = ptp->timeset[i].window;
- } else {
- min_valid = true;
- min_set = ptp->timeset[i].window;
- }
- }
- }
-
- if (min_valid) {
- if (ptp->base_sync_valid && (min_set > ptp->base_sync_ns))
- min = ptp->base_sync_ns;
- else
- min = min_set;
- } else {
- min = SYNCHRONISATION_GRANULARITY_NS;
}
- /* Discard excessively long synchronise durations. The MC times
- * when it finishes reading the host time so the corrected window
- * time should be fairly constant for a given platform.
+ /* Find the last good host-MC synchronization result. The MC times
+ * when it finishes reading the host time so the corrected window time
+ * should be fairly constant for a given platform.
*/
total = 0;
for (i = 0; i < number_readings; i++)
if (ngood == 0) {
netif_warn(efx, drv, efx->net_dev,
- "PTP no suitable synchronisations %dns %dns\n",
- ptp->base_sync_ns, min_set);
+ "PTP no suitable synchronisations %dns\n",
+ ptp->base_sync_ns);
return -EAGAIN;
}
* the receive timestamp from the MC - this will probably occur after the
* packet arrival because of the processing in the MC.
*/
-static void efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
+static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
{
struct efx_nic *efx = channel->efx;
struct efx_ptp_data *ptp = efx->ptp_data;
struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb;
- u8 *data;
+ u8 *match_data_012, *match_data_345;
unsigned int version;
match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS);
/* Correct version? */
if (ptp->mode == MC_CMD_PTP_MODE_V1) {
- if (skb->len < PTP_V1_MIN_LENGTH) {
- netif_receive_skb(skb);
- return;
+ if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) {
+ return false;
}
version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]);
if (version != PTP_VERSION_V1) {
- netif_receive_skb(skb);
- return;
+ return false;
}
+
+ /* PTP V1 uses all six bytes of the UUID to match the packet
+ * to the timestamp
+ */
+ match_data_012 = skb->data + PTP_V1_UUID_OFFSET;
+ match_data_345 = skb->data + PTP_V1_UUID_OFFSET + 3;
} else {
- if (skb->len < PTP_V2_MIN_LENGTH) {
- netif_receive_skb(skb);
- return;
+ if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) {
+ return false;
}
version = skb->data[PTP_V2_VERSION_OFFSET];
-
- BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2);
- BUILD_BUG_ON(PTP_V1_UUID_OFFSET != PTP_V2_MC_UUID_OFFSET);
- BUILD_BUG_ON(PTP_V1_UUID_LENGTH != PTP_V2_MC_UUID_LENGTH);
- BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET);
- BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH);
-
if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) {
- netif_receive_skb(skb);
- return;
+ return false;
+ }
+
+ /* The original V2 implementation uses bytes 2-7 of
+ * the UUID to match the packet to the timestamp. This
+ * discards two of the bytes of the MAC address used
+ * to create the UUID (SF bug 33070). The PTP V2
+ * enhanced mode fixes this issue and uses bytes 0-2
+ * and byte 5-7 of the UUID.
+ */
+ match_data_345 = skb->data + PTP_V2_UUID_OFFSET + 5;
+ if (ptp->mode == MC_CMD_PTP_MODE_V2) {
+ match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 2;
+ } else {
+ match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 0;
+ BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED);
}
}
timestamps = skb_hwtstamps(skb);
memset(timestamps, 0, sizeof(*timestamps));
+ /* We expect the sequence number to be in the same position in
+ * the packet for PTP V1 and V2
+ */
+ BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET);
+ BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH);
+
/* Extract UUID/Sequence information */
- data = skb->data + PTP_V1_UUID_OFFSET;
- match->words[0] = (data[0] |
- (data[1] << 8) |
- (data[2] << 16) |
- (data[3] << 24));
- match->words[1] = (data[4] |
- (data[5] << 8) |
+ match->words[0] = (match_data_012[0] |
+ (match_data_012[1] << 8) |
+ (match_data_012[2] << 16) |
+ (match_data_345[0] << 24));
+ match->words[1] = (match_data_345[1] |
+ (match_data_345[2] << 8) |
(skb->data[PTP_V1_SEQUENCE_OFFSET +
PTP_V1_SEQUENCE_LENGTH - 1] <<
16));
skb_queue_tail(&ptp->rxq, skb);
queue_work(ptp->workwq, &ptp->work);
+
+ return true;
}
/* Transmit a PTP packet. This has to be transmitted by the MC
* timestamped
*/
init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
- new_mode = MC_CMD_PTP_MODE_V2;
+ new_mode = MC_CMD_PTP_MODE_V2_ENHANCED;
enable_wanted = true;
break;
case HWTSTAMP_FILTER_PTP_V2_EVENT:
if (init->tx_type != HWTSTAMP_TX_OFF)
enable_wanted = true;
+ /* Old versions of the firmware do not support the improved
+ * UUID filtering option (SF bug 33070). If the firmware does
+ * not accept the enhanced mode, fall back to the standard PTP
+ * v2 UUID filtering.
+ */
rc = efx_ptp_change_mode(efx, enable_wanted, new_mode);
+ if ((rc != 0) && (new_mode == MC_CMD_PTP_MODE_V2_ENHANCED))
+ rc = efx_ptp_change_mode(efx, enable_wanted, MC_CMD_PTP_MODE_V2);
if (rc != 0)
return rc;
projects / firefly-linux-kernel-4.4.55.git / blobdiff