netdev - [PATCH net-next v2 1/4] ibmveth: change rx buffer default allocation for CMO

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Date:	Mon, 27 Apr 2015 17:10:52 -0500
From:	Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
To:	netdev@...r.kernel.org
Cc:	linuxppc-dev@...ts.ozlabs.org, nfont@...ux.vnet.ibm.com,
	eric.dumazet@...il.com, Brian King <brking@...ux.vnet.ibm.com>
Subject: [PATCH net-next v2 1/4] ibmveth: change rx buffer default allocation for CMO

This patch enables 64k rx buffer pools by default.  If Cooperative
Memory Overcommitment (CMO) is enabled, the number of 64k buffers
is reduced to save memory.

Cc: Brian King <brking@...ux.vnet.ibm.com>
Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmveth.c | 3 +++
 drivers/net/ethernet/ibm/ibmveth.h | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index cd7675a..0210622 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1424,6 +1424,9 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 
 	memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
 
+	if (firmware_has_feature(FW_FEATURE_CMO))
+		memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
+
 	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 		struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
 		int error;
diff --git a/drivers/net/ethernet/ibm/ibmveth.h b/drivers/net/ethernet/ibm/ibmveth.h
index 1f37499..0dc664b 100644
--- a/drivers/net/ethernet/ibm/ibmveth.h
+++ b/drivers/net/ethernet/ibm/ibmveth.h
@@ -104,7 +104,8 @@ static inline long h_illan_attributes(unsigned long unit_address,
 
 static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
 static int pool_count[] = { 256, 512, 256, 256, 256 };
-static int pool_active[] = { 1, 1, 0, 0, 0};
+static int pool_count_cmo[] = { 256, 512, 256, 256, 64 };
+static int pool_active[] = { 1, 1, 0, 0, 1};
 
 #define IBM_VETH_INVALID_MAP ((u16)0xffff)
 
-- 
1.9.3

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