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i40e/i40evf: Faster RX via avoiding FCoE 

As it turns out, calling into other files from hot path hurts
performance a lot.  In this case the majority of the time we
call "check FCoE" and the packet is *not* FCoE, but this call
was taking 5% of our total cycles spent on receive.

Change-ID: I080552c26e7060bc7b78504dc2763f6f0b3d8c76
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jesse Brandeburg 2016-04-01 03:56:06 -07:00 committed by Jeff Kirsher
parent 84b079928a
commit 1f15d66712
5 changed files with 30 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/ethernet/intel/i40e/i40e_fcoe.c
View File

@ -1,7 +1,7 @@
/*******************************************************************************
*
* Intel Ethernet Controller XL710 Family Linux Driver
* Copyright(c) 2013 - 2015 Intel Corporation.
* Copyright(c) 2013 - 2016 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -37,16 +37,6 @@
#include "i40e.h"
#include "i40e_fcoe.h"
/**
* i40e_rx_is_fcoe - returns true if the rx packet type is FCoE
* @ptype: the packet type field from rx descriptor write-back
**/
static inline bool i40e_rx_is_fcoe(u16 ptype)
{
return (ptype >= I40E_RX_PTYPE_L2_FCOE_PAY3) &&
(ptype <= I40E_RX_PTYPE_L2_FCOE_VFT_FCOTHER);
}
/**
* i40e_fcoe_sof_is_class2 - returns true if this is a FC Class 2 SOF
* @sof: the FCoE start of frame delimiter

8
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1703,7 +1703,9 @@ static int i40e_clean_rx_irq_ps(struct i40e_ring *rx_ring, const int budget)
? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1)
: 0;
#ifdef I40E_FCOE
if (!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb)) {
if (unlikely(
i40e_rx_is_fcoe(rx_ptype) &&
!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb))) {
dev_kfree_skb_any(skb);
continue;
}
@ -1834,7 +1836,9 @@ static int i40e_clean_rx_irq_1buf(struct i40e_ring *rx_ring, int budget)
? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1)
: 0;
#ifdef I40E_FCOE
if (!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb)) {
if (unlikely(
i40e_rx_is_fcoe(rx_ptype) &&
!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb))) {
dev_kfree_skb_any(skb);
continue;
}

10
drivers/net/ethernet/intel/i40e/i40e_txrx.h
View File

@ -448,4 +448,14 @@ static inline bool i40e_chk_linearize(struct sk_buff *skb, int count)
return __i40e_chk_linearize(skb);
}
/**
* i40e_rx_is_fcoe - returns true if the Rx packet type is FCoE
* @ptype: the packet type field from Rx descriptor write-back
**/
static inline bool i40e_rx_is_fcoe(u16 ptype)
{
return (ptype >= I40E_RX_PTYPE_L2_FCOE_PAY3) &&
(ptype <= I40E_RX_PTYPE_L2_FCOE_VFT_FCOTHER);
}
#endif /* _I40E_TXRX_H_ */

4
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
View File

@ -1160,7 +1160,9 @@ static int i40e_clean_rx_irq_ps(struct i40e_ring *rx_ring, const int budget)
? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1)
: 0;
#ifdef I40E_FCOE
if (!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb)) {
if (unlikely(
i40e_rx_is_fcoe(rx_ptype) &&
!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb))) {
dev_kfree_skb_any(skb);
continue;
}

10
drivers/net/ethernet/intel/i40evf/i40e_txrx.h
View File

@ -430,4 +430,14 @@ static inline bool i40e_chk_linearize(struct sk_buff *skb, int count)
return __i40evf_chk_linearize(skb);
}
/**
* i40e_rx_is_fcoe - returns true if the Rx packet type is FCoE
* @ptype: the packet type field from Rx descriptor write-back
**/
static inline bool i40e_rx_is_fcoe(u16 ptype)
{
return (ptype >= I40E_RX_PTYPE_L2_FCOE_PAY3) &&
(ptype <= I40E_RX_PTYPE_L2_FCOE_VFT_FCOTHER);
}
#endif /* _I40E_TXRX_H_ */