i40e: Reorder logic for coalescing RS bits

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This patch reorders the logic at the end of i40e_tx_map to address the
fact that the logic was rather convoluted and much larger than it needed
to be.

In order to try and coalesce the code paths I have updated some of the
comments and repurposed some of the variables in order to reduce
unnecessary overhead.

This patch does the following:
1.  Quit tracking skb->xmit_more with a flag, just max out packet_stride
2.  Drop tail_bump and do_rs and instead just use desc_count and td_cmd
3.  Pull comments from ixgbe that make need for wmb() more explicit.

Change-ID: Ic7da85ec75043c634e87fef958109789bcc6317c
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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This commit is contained in:

Alexander Duyck 2016-10-11 15:26:54 -07:00 • committed by Jeff Kirsher

parent 4b8164467b

commit 1dc8b53879

4 changed files with 108 additions and 104 deletions

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105

drivers/net/ethernet/intel/i40e/i40e_txrx.c

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1

drivers/net/ethernet/intel/i40e/i40e_txrx.h

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105

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

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1

drivers/net/ethernet/intel/i40evf/i40e_txrx.h

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