netdev - [RFC 02/19] staging: qlge: change LARGE_BUFFER_MAX

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Message-Id: <20210621134902.83587-3-coiby.xu@gmail.com>
Date:   Mon, 21 Jun 2021 21:48:45 +0800
From:   Coiby Xu <coiby.xu@...il.com>
To:     linux-staging@...ts.linux.dev
Cc:     netdev@...r.kernel.org,
        Benjamin Poirier <benjamin.poirier@...il.com>,
        Shung-Hsi Yu <shung-hsi.yu@...e.com>,
        Manish Chopra <manishc@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com (supporter:QLOGIC QLGE 10Gb ETHERNET
        DRIVER), Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC 02/19] staging: qlge: change LARGE_BUFFER_MAX_SIZE to 4096

LARGE_BUFFER_MAX_SIZE=4096 could make better use of memory. This choice
is consist with ixgbe and e1000 ,
   - ixgbe sets the rx buffer's page order to 0 unless FCoE is enabled
   - e1000 allocs a page for a jumbo receive buffer

Signed-off-by: Coiby Xu <coiby.xu@...il.com>
---
 drivers/staging/qlge/TODO   | 2 --
 drivers/staging/qlge/qlge.h | 2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/staging/qlge/TODO b/drivers/staging/qlge/TODO
index 449d7dca478b..0e26fac1ddc5 100644
--- a/drivers/staging/qlge/TODO
+++ b/drivers/staging/qlge/TODO
@@ -4,8 +4,6 @@
   ql_build_rx_skb(). That function is now used exclusively to handle packets
   that underwent header splitting but it still contains code to handle non
   split cases.
-* while in that area, using two 8k buffers to store one 9k frame is a poor
-  choice of buffer size.
 * in the "chain of large buffers" case, the driver uses an skb allocated with
   head room but only puts data in the frags.
 * rename "rx" queues to "completion" queues. Calling tx completion queues "rx
diff --git a/drivers/staging/qlge/qlge.h b/drivers/staging/qlge/qlge.h
index 55e0ad759250..f54d38606b78 100644
--- a/drivers/staging/qlge/qlge.h
+++ b/drivers/staging/qlge/qlge.h
@@ -52,7 +52,7 @@
 #define RX_RING_SHADOW_SPACE	(sizeof(u64) + \
 		MAX_DB_PAGES_PER_BQ(QLGE_BQ_LEN) * sizeof(u64) + \
 		MAX_DB_PAGES_PER_BQ(QLGE_BQ_LEN) * sizeof(u64))
-#define LARGE_BUFFER_MAX_SIZE 8192
+#define LARGE_BUFFER_MAX_SIZE 4096
 #define LARGE_BUFFER_MIN_SIZE 2048
 
 #define MAX_CQ 128
-- 
2.32.0