[PATCH 2/2] net/i40e: fix blocking link wait on device start

[Bruce Richardson]

On Wed, Jun 03, 2026 at 02:34:07PM +0000, Ciara Loftus wrote:
> Currently, device start performs a synchronous link status update,
> blocking for up to one second if the link is not yet up. This causes
> unnecessary startup delay in scenarios where the link partner is slow to
> come up or unavailable.
> 
> The wait was introduced alongside the maximum frame size MAC config
> command. Some devices require the link to be up before issuing that
> command, so the solution was to block at device start until link was
> established.
> 
> To address the issue, remove the unconditional blocking wait. Take note
> if the link was down at the time of the MAC config command during device
> start and if it was, re-issue the command upon notification of the first
> link-up event.
> 
> In the case where all interrupt vectors are consumed by Rx queues, no
> interrupt or alarm handler is available to process link-up events. The
> blocking wait is retained for this narrow case to preserve correctness.
> 
> Fixes: 82fcf20d039c ("net/i40e: fix maximum frame size configuration")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>