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i40e: Drop dead code and flags from Tx hotpath 

Drop Tx flag and TXSW which is tested but never set.

As a result of this change we can drop a complicated check that always
resulted in the final result of i40e_tx_csum being equal to the
CHECKSUM_PARTIAL value.  As such we can replace the entire function call
with just a check for skb->summed == CHECKSUM_PARTIAL.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2013-09-28 06:00:32 +00:00 committed by Jeff Kirsher
parent a5e9c57264
commit b194130627
2 changed files with 6 additions and 28 deletions
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33
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1299,27 +1299,6 @@ static int i40e_tx_prepare_vlan_flags(struct sk_buff *skb,
return 0;
}
/**
* i40e_tx_csum - is checksum offload requested
* @tx_ring: ptr to the ring to send
* @skb: ptr to the skb we're sending
* @tx_flags: the collected send information
* @protocol: the send protocol
*
* Returns true if checksum offload is requested
**/
static bool i40e_tx_csum(struct i40e_ring *tx_ring, struct sk_buff *skb,
u32 tx_flags, __be16 protocol)
{
if ((skb->ip_summed != CHECKSUM_PARTIAL) &&
!(tx_flags & I40E_TX_FLAGS_TXSW)) {
if (!(tx_flags & I40E_TX_FLAGS_HW_VLAN))
return false;
}
return skb->ip_summed == CHECKSUM_PARTIAL;
}
/**
* i40e_tso - set up the tso context descriptor
* @tx_ring: ptr to the ring to send
@ -1785,16 +1764,16 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb,
skb_tx_timestamp(skb);
/* Always offload the checksum, since it's in the data descriptor */
if (i40e_tx_csum(tx_ring, skb, tx_flags, protocol))
tx_flags |= I40E_TX_FLAGS_CSUM;
/* always enable offload insertion */
/* always enable CRC insertion offload */
td_cmd |= I40E_TX_DESC_CMD_ICRC;
if (tx_flags & I40E_TX_FLAGS_CSUM)
/* Always offload the checksum, since it's in the data descriptor */
if (skb->ip_summed == CHECKSUM_PARTIAL) {
tx_flags |= I40E_TX_FLAGS_CSUM;
i40e_tx_enable_csum(skb, tx_flags, &td_cmd, &td_offset,
tx_ring, &cd_tunneling);
}
i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss,
cd_tunneling, cd_l2tag2);

1
drivers/net/ethernet/intel/i40e/i40e_txrx.h
View File

@ -102,7 +102,6 @@
#define I40E_TX_FLAGS_IPV6 (u32)(1 << 5)
#define I40E_TX_FLAGS_FCCRC (u32)(1 << 6)
#define I40E_TX_FLAGS_FSO (u32)(1 << 7)
#define I40E_TX_FLAGS_TXSW (u32)(1 << 8)
#define I40E_TX_FLAGS_VLAN_MASK 0xffff0000
#define I40E_TX_FLAGS_VLAN_PRIO_MASK 0xe0000000
#define I40E_TX_FLAGS_VLAN_PRIO_SHIFT 29