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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>
This commit is contained in:
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
View File

@ -2932,10 +2932,12 @@ bool __i40e_chk_linearize(struct sk_buff *skb)
* @hdr_len: size of the packet header
* @td_cmd: the command field in the descriptor
* @td_offset: offset for checksum or crc
*
* Returns 0 on success, -1 on failure to DMA
**/
static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
struct i40e_tx_buffer *first, u32 tx_flags,
const u8 hdr_len, u32 td_cmd, u32 td_offset)
static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
struct i40e_tx_buffer *first, u32 tx_flags,
const u8 hdr_len, u32 td_cmd, u32 td_offset)
{
unsigned int data_len = skb->data_len;
unsigned int size = skb_headlen(skb);
@ -3093,7 +3095,7 @@ static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
mmiowb();
}
return;
return 0;
dma_error:
dev_info(tx_ring->dev, "TX DMA map failed\n");
@ -3110,6 +3112,8 @@ static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
}
tx_ring->next_to_use = i;
return -1;
}
/**
@ -3210,8 +3214,9 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb,
*/
i40e_atr(tx_ring, skb, tx_flags);
i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
td_cmd, td_offset);
if (i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
td_cmd, td_offset))
goto cleanup_tx_tstamp;
return NETDEV_TX_OK;
@ -3219,6 +3224,15 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb,
i40e_trace(xmit_frame_ring_drop, first->skb, tx_ring);
dev_kfree_skb_any(first->skb);
first->skb = NULL;
cleanup_tx_tstamp:
if (unlikely(tx_flags & I40E_TX_FLAGS_TSYN)) {
struct i40e_pf *pf = i40e_netdev_to_pf(tx_ring->netdev);
dev_kfree_skb_any(pf->ptp_tx_skb);
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
}
return NETDEV_TX_OK;
}