net: qed: fix NVMe login fails over VFs

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25ms sleep cycles in waiting for PF response are excessive and may lead
to different timeout failures.

Start to wait with short udelays, and in most cases polling will end
here. If the time was not sufficient, switch to msleeps.
usleep_range() may go far beyond 100us depending on platform and tick
configuration, hence atomic udelays for consistency.

Also add explicit DMA barriers since 'done' always comes from a shared
request-response DMA pool, and note that in the comment nearby.

Fixes: 1408cc1fa4 ("qed: Introduce VFs")
Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Alexander Lobakin 2020-06-23 16:51:32 +03:00 • committed by David S. Miller

parent 4079c7f7a2

commit ccd7c7ce16

1 changed files with 18 additions and 5 deletions

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23

drivers/net/ethernet/qlogic/qed/qed_vf.c

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