i40e: avoid permanent lock of *_PTP_TX_IN_PROGRESS

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The i40e driver uses a bit lock to indicate when a Tx timestamp is in
progress to avoid attempting to timestamp multiple packets at once. This
is required because hardware only has registers to handle one request at
a time.

There is a corner case where we failed to cleanup the bit lock after
a failed transmit. This can potentially result in a state bit being
locked forever.

Add some cleanup code to i40e_xmit_frame_ring to check and make sure we
cleanup incase of these failures. We also modify i40e_tx_map to return
an error code indication DMA failure.

Reported-by: Reported-by: David Mirabito <davidm@metamako.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Jacob Keller 2017-05-03 10:28:54 -07:00 • committed by Jeff Kirsher

parent bbc4e7d273

commit 69077577af

1 changed files with 20 additions and 6 deletions

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26

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

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