net: qed: fix left elements count calculation

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qed_chain_get_element_left{,_u32} returned 0 when the difference
between producer and consumer page count was equal to the total
page count.
Fix this by conditional expanding of producer value (vs
unconditional). This allowed to eliminate normalizaton against
total page count, which was the cause of this bug.

Misc: replace open-coded constants with common defines.

Fixes: a91eb52abb ("qed: Revisit chain implementation")
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 16:51:29 +03:00 • committed by David S. Miller

parent b4730ae6a4

commit 97dd1abd02

1 changed files with 16 additions and 10 deletions

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include/linux/qed/qed_chain.h

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