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staging: octeon: Add a workaround for the issue of GCC8

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In function cvm_oct_xmit(), the packet length is set with code like
this:
  pko_command.s.total_bytes = skb->len;

But when building with gcc8, the pko_command.s.total_bytes doesn't
emit the right value when it is used in the following codes:
        /* Send the packet to the output queue */
        if (unlikely(cvmx_pko_send_packet_finish(priv->port,
                                                 priv->queue + qos,
                                                 pko_command, hw_buffer,
                                                 CVMX_PKO_LOCK_NONE))) {

Adding a barrier after the assignment would generate the right codes.

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
This commit is contained in:
Kevin Hao 2018-06-20 18:41:55 +08:00 committed by Bruce Ashfield
parent e25dbfe953
commit 3373c0cf71
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/octeon/ethernet-tx.c
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@ -264,6 +264,9 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
pko_command.s.segs = 1;
pko_command.s.total_bytes = skb->len;
#if GCC_VERSION >= 80000
barrier();
#endif
pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
pko_command.s.subone0 = 1;