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How intel 82599 using link flow control

jsung7
Beginner
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How intel 82599 using link flow control?Is it Auto-Negotiation? But I seems that will not Auto-Negotiation in the intel drive.

How can I using it ?

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jsung7
Beginner
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If speed of the link 10G,it will not auto-negtiation.Driver code:

if (speed == IXGBE_LINK_SPEED_1GB_FULL) //only 1Gb will negtiation.

ret_val = ixgbe_fc_autoneg_fiber(hw);

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