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ixgbe: Modify setup of descriptor flags to avoid conditional jumps

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This change makes it more likely that the descriptor flags setup will use
cmov instructions instead of conditional jumps when setting up the flags.
The advantage to this is that the code should just flow a bit more
smoothly.

To do this it is necessary to set the TX_FLAGS_CSUM bit in tx_flags when
doing TSO so that we also do the checksum in addition to the segmentation
offload.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2012-02-08 07:50:45 +00:00 committed by Jeff Kirsher
parent a50c29dd09
commit 93f5b3c1f1
1 changed files with 17 additions and 17 deletions
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34
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -6689,7 +6689,7 @@ static __le32 ixgbe_tx_cmd_type(u32 tx_flags)
/* set segmentation enable bits for TSO/FSO */
#ifdef IXGBE_FCOE
if ((tx_flags & IXGBE_TX_FLAGS_TSO) || (tx_flags & IXGBE_TX_FLAGS_FSO))
if (tx_flags & (IXGBE_TX_FLAGS_TSO | IXGBE_TX_FLAGS_FSO))
#else
if (tx_flags & IXGBE_TX_FLAGS_TSO)
#endif
@ -6700,33 +6700,33 @@ static __le32 ixgbe_tx_cmd_type(u32 tx_flags)
static __le32 ixgbe_tx_olinfo_status(u32 tx_flags, unsigned int paylen)
{
__le32 olinfo_status =
cpu_to_le32(paylen << IXGBE_ADVTXD_PAYLEN_SHIFT);
if (tx_flags & IXGBE_TX_FLAGS_TSO) {
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_TXSM |
(1 << IXGBE_ADVTXD_IDX_SHIFT));
/* enble IPv4 checksum for TSO */
if (tx_flags & IXGBE_TX_FLAGS_IPV4)
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_IXSM);
}
__le32 olinfo_status = cpu_to_le32(paylen << IXGBE_ADVTXD_PAYLEN_SHIFT);
/* enable L4 checksum for TSO and TX checksum offload */
if (tx_flags & IXGBE_TX_FLAGS_CSUM)
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_TXSM);
#ifdef IXGBE_FCOE
/* use index 1 context for FCOE/FSO */
if (tx_flags & IXGBE_TX_FLAGS_FCOE)
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_CC |
(1 << IXGBE_ADVTXD_IDX_SHIFT));
/* enble IPv4 checksum for TSO */
if (tx_flags & IXGBE_TX_FLAGS_IPV4)
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_IXSM);
/* use index 1 context for TSO/FSO/FCOE */
#ifdef IXGBE_FCOE
if (tx_flags & (IXGBE_TX_FLAGS_TSO | IXGBE_TX_FLAGS_FCOE))
#else
if (tx_flags & IXGBE_TX_FLAGS_TSO)
#endif
olinfo_status |= cpu_to_le32(1 << IXGBE_ADVTXD_IDX_SHIFT);
/*
* Check Context must be set if Tx switch is enabled, which it
* always is for case where virtual functions are running
*/
#ifdef IXGBE_FCOE
if (tx_flags & (IXGBE_TX_FLAGS_TXSW | IXGBE_TX_FLAGS_FCOE))
#else
if (tx_flags & IXGBE_TX_FLAGS_TXSW)
#endif
olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_CC);
return olinfo_status;
@ -7140,7 +7140,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
if (tso < 0)
goto out_drop;
else if (tso)
tx_flags |= IXGBE_TX_FLAGS_TSO;
tx_flags |= IXGBE_TX_FLAGS_TSO | IXGBE_TX_FLAGS_CSUM;
else if (ixgbe_tx_csum(tx_ring, skb, tx_flags, protocol))
tx_flags |= IXGBE_TX_FLAGS_CSUM;