netdev - [PATCH net 1/4] qed: Fix corner case for chain in-between pages

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Date:	Thu, 3 Dec 2015 05:59:13 -0500
From:	Manish Chopra <manish.chopra@...gic.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <Ariel.Elior@...gic.com>,
	<Yuval.Mintz@...gic.com>, Tomer Tayar <Tomer.Tayar@...gic.com>
Subject: [PATCH net 1/4] qed: Fix corner case for chain in-between pages

From: Tomer Tayar <Tomer.Tayar@...gic.com>

The amount of chain next pointer elements between the producer
and the consumer indices depends on which pages they currently
point to. The current calculation is based only on their difference,
and it can lead to a number of free elements which is higher by 1
than the actual value.

Signed-off-by: Tomer Tayar <Tomer.Tayar@...gic.com>
Signed-off-by: Manish Chopra <manish.chopra@...gic.com>
---
 include/linux/qed/qed_chain.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/qed/qed_chain.h b/include/linux/qed/qed_chain.h
index b920c36..41b9049 100644
--- a/include/linux/qed/qed_chain.h
+++ b/include/linux/qed/qed_chain.h
@@ -111,7 +111,8 @@ static inline u16 qed_chain_get_elem_left(struct qed_chain *p_chain)
 	used = ((u32)0x10000u + (u32)(p_chain->prod_idx)) -
 		(u32)p_chain->cons_idx;
 	if (p_chain->mode == QED_CHAIN_MODE_NEXT_PTR)
-		used -= (used / p_chain->elem_per_page);
+		used -= p_chain->prod_idx / p_chain->elem_per_page -
+			p_chain->cons_idx / p_chain->elem_per_page;
 
 	return p_chain->capacity - used;
 }
-- 
1.7.1

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