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Message-ID: <1403782266-25362-3-git-send-email-Yuval.Mintz@qlogic.com>
Date: Thu, 26 Jun 2014 14:31:05 +0300
From: Yuval Mintz <Yuval.Mintz@...gic.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <Ariel.Elior@...gic.com>,
Dmitry Kravkov <Dmitry.Kravkov@...gic.com>,
Yuval Mintz <Yuval.Mintz@...gic.com>
Subject: [PATCH net-next 2/3] bnx2x: enlarge minimal alignemnt of data offset
From: Dmitry Kravkov <Dmitry.Kravkov@...gic.com>
This improves the performance of driver on machine with L1_CACHE_SHIFT of at
most 32 bytes [HW was planned for 64-byte aligned fastpath data].
Signed-off-by: Dmitry Kravkov <Dmitry.Kravkov@...gic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@...gic.com>
---
drivers/net/ethernet/broadcom/bnx2x/bnx2x.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
index faf262a..ce8f869 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
@@ -1508,8 +1508,10 @@ struct bnx2x {
/* TCP with Timestamp Option (32) + IPv6 (40) */
#define ETH_MAX_TPA_HEADER_SIZE 72
- /* Max supported alignment is 256 (8 shift) */
-#define BNX2X_RX_ALIGN_SHIFT min(8, L1_CACHE_SHIFT)
+ /* Max supported alignment is 256 (8 shift)
+ * minimal alignment shift 6 is optimal for 57xxx HW performance
+ */
+#define BNX2X_RX_ALIGN_SHIFT max(6, min(8, L1_CACHE_SHIFT))
/* FW uses 2 Cache lines Alignment for start packet and size
*
--
1.8.3.1
--
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