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authorBen Hutchings <bhutchings@solarflare.com>2014-02-12 18:58:34 +0000
committerDavid S. Miller <davem@davemloft.net>2014-02-12 17:53:33 -0500
commitce320f44d677549a29ae8d6ae79e66d1c997f87a (patch)
tree6bfd78a340f0e95aab0342639a1f5342de533668 /drivers/net/ethernet/sfc
parentf9fd7ec786e41a3730916bbc1bc1d9d347f07ec5 (diff)
sfc: Cache skb->data in local variable in efx_ptp_rx()
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Shradha Shah <sshah@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc')
-rw-r--r--drivers/net/ethernet/sfc/ptp.c23
1 files changed, 13 insertions, 10 deletions
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 52be63dc68cf..7d0de5002f41 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1366,6 +1366,7 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb;
u8 *match_data_012, *match_data_345;
unsigned int version;
+ u8 *data;
match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS);
@@ -1374,7 +1375,8 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) {
return false;
}
- version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]);
+ data = skb->data;
+ version = ntohs(*(__be16 *)&data[PTP_V1_VERSION_OFFSET]);
if (version != PTP_VERSION_V1) {
return false;
}
@@ -1382,13 +1384,14 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
/* 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;
+ match_data_012 = data + PTP_V1_UUID_OFFSET;
+ match_data_345 = data + PTP_V1_UUID_OFFSET + 3;
} else {
if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) {
return false;
}
- version = skb->data[PTP_V2_VERSION_OFFSET];
+ data = skb->data;
+ version = data[PTP_V2_VERSION_OFFSET];
if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) {
return false;
}
@@ -1400,17 +1403,17 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
* 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;
+ match_data_345 = data + PTP_V2_UUID_OFFSET + 5;
if (ptp->mode == MC_CMD_PTP_MODE_V2) {
- match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 2;
+ match_data_012 = data + PTP_V2_UUID_OFFSET + 2;
} else {
- match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 0;
+ match_data_012 = data + PTP_V2_UUID_OFFSET + 0;
BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED);
}
}
/* Does this packet require timestamping? */
- if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) {
+ if (ntohs(*(__be16 *)&data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) {
match->state = PTP_PACKET_STATE_UNMATCHED;
/* We expect the sequence number to be in the same position in
@@ -1426,8 +1429,8 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
(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] <<
+ (data[PTP_V1_SEQUENCE_OFFSET +
+ PTP_V1_SEQUENCE_LENGTH - 1] <<
16));
} else {
match->state = PTP_PACKET_STATE_MATCH_UNWANTED;