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Subject[PATCH v3 net-next-2.6] cxgb3: Added private MAC address and provisioning packet handler for iSCSI
From: Karen Xie <kxie@chelsio.com>

[PATCH v3 net-next-2.6] cxgb3: Added private MAC address and provisioning packet handler for iSCSI

This patch added support of private MAC address per port and provisioning
packet handler for iSCSI traffic only.

Acked-by: Karen Xie <kxie@chelsio.com>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Rakesh Ranjan <rakesh@chelsio.com>
---

drivers/net/cxgb3/adapter.h | 16 ++++++++++++++++
drivers/net/cxgb3/cxgb3_main.c | 22 ++++++++++++++++++----
drivers/net/cxgb3/sge.c | 28 +++++++++++++++++++---------
3 files changed, 53 insertions(+), 13 deletions(-)


diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2b1aea6..463633e 100644
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -48,12 +48,27 @@
struct vlan_group;
struct adapter;
struct sge_qset;
+struct port_info;

enum { /* rx_offload flags */
T3_RX_CSUM = 1 << 0,
T3_LRO = 1 << 1,
};

+enum {
+ LAN_MAC_IDX = 0,
+ SAN_MAC_IDX,
+
+ MAX_MAC_IDX
+};
+
+struct iscsi_config {
+ __u8 mac_addr[ETH_ALEN];
+ __u32 flags;
+ int (*send)(struct port_info *pi, struct sk_buff **skb);
+ int (*recv)(struct port_info *pi, struct sk_buff *skb);
+};
+
struct port_info {
struct adapter *adapter;
struct vlan_group *vlan_grp;
@@ -68,6 +83,7 @@ struct port_info {
struct net_device_stats netstats;
int activity;
__be32 iscsi_ipv4addr;
+ struct iscsi_config iscsic;

int link_fault; /* link fault was detected */
};
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 34e776c..c9113d3 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -344,8 +344,10 @@ static void link_start(struct net_device *dev)

init_rx_mode(&rm, dev, dev->mc_list);
t3_mac_reset(mac);
+ t3_mac_set_num_ucast(mac, MAX_MAC_IDX);
t3_mac_set_mtu(mac, dev->mtu);
- t3_mac_set_address(mac, 0, dev->dev_addr);
+ t3_mac_set_address(mac, LAN_MAC_IDX, dev->dev_addr);
+ t3_mac_set_address(mac, SAN_MAC_IDX, pi->iscsic.mac_addr);
t3_mac_set_rx_mode(mac, &rm);
t3_link_start(&pi->phy, mac, &pi->link_config);
t3_mac_enable(mac, MAC_DIRECTION_RX | MAC_DIRECTION_TX);
@@ -903,6 +905,7 @@ static inline int offload_tx(struct t3cdev *tdev, struct sk_buff *skb)
static int write_smt_entry(struct adapter *adapter, int idx)
{
struct cpl_smt_write_req *req;
+ struct port_info *pi = netdev_priv(adapter->port[idx]);
struct sk_buff *skb = alloc_skb(sizeof(*req), GFP_KERNEL);

if (!skb)
@@ -913,8 +916,8 @@ static int write_smt_entry(struct adapter *adapter, int idx)
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SMT_WRITE_REQ, idx));
req->mtu_idx = NMTUS - 1; /* should be 0 but there's a T3 bug */
req->iff = idx;
- memset(req->src_mac1, 0, sizeof(req->src_mac1));
memcpy(req->src_mac0, adapter->port[idx]->dev_addr, ETH_ALEN);
+ memcpy(req->src_mac1, pi->iscsic.mac_addr, ETH_ALEN);
skb->priority = 1;
offload_tx(&adapter->tdev, skb);
return 0;
@@ -2516,7 +2519,7 @@ static int cxgb_set_mac_addr(struct net_device *dev, void *p)
return -EINVAL;

memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
- t3_mac_set_address(&pi->mac, 0, dev->dev_addr);
+ t3_mac_set_address(&pi->mac, LAN_MAC_IDX, dev->dev_addr);
if (offload_running(adapter))
write_smt_entry(adapter, pi->port_id);
return 0;
@@ -2654,7 +2657,7 @@ static void check_t3b2_mac(struct adapter *adapter)
struct cmac *mac = &p->mac;

t3_mac_set_mtu(mac, dev->mtu);
- t3_mac_set_address(mac, 0, dev->dev_addr);
+ t3_mac_set_address(mac, LAN_MAC_IDX, dev->dev_addr);
cxgb_set_rxmode(dev);
t3_link_start(&p->phy, mac, &p->link_config);
t3_mac_enable(mac, MAC_DIRECTION_RX | MAC_DIRECTION_TX);
@@ -3112,6 +3115,14 @@ static const struct net_device_ops cxgb_netdev_ops = {
#endif
};

+static void __devinit cxgb3_init_iscsi_mac(struct net_device *dev)
+{
+ struct port_info *pi = netdev_priv(dev);
+
+ memcpy(pi->iscsic.mac_addr, dev->dev_addr, ETH_ALEN);
+ pi->iscsic.mac_addr[3] |= 0x80;
+}
+
static int __devinit init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -3270,6 +3281,9 @@ static int __devinit init_one(struct pci_dev *pdev,
goto out_free_dev;
}

+ for_each_port(adapter, i)
+ cxgb3_init_iscsi_mac(adapter->port[i]);
+
/* Driver's ready. Reflect it on LEDs */
t3_led_ready(adapter);

diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index f866128..b7f4ee4 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -1946,10 +1946,9 @@ static void restart_tx(struct sge_qset *qs)
* Check if the ARP request is probing the private IP address
* dedicated to iSCSI, generate an ARP reply if so.
*/
-static void cxgb3_arp_process(struct adapter *adapter, struct sk_buff *skb)
+static void cxgb3_arp_process(struct port_info *pi, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
- struct port_info *pi;
struct arphdr *arp;
unsigned char *arp_ptr;
unsigned char *sha;
@@ -1972,12 +1971,11 @@ static void cxgb3_arp_process(struct adapter *adapter, struct sk_buff *skb)
arp_ptr += dev->addr_len;
memcpy(&tip, arp_ptr, sizeof(tip));

- pi = netdev_priv(dev);
if (tip != pi->iscsi_ipv4addr)
return;

arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
- dev->dev_addr, sha);
+ pi->iscsic.mac_addr, sha);

}

@@ -1986,6 +1984,19 @@ static inline int is_arp(struct sk_buff *skb)
return skb->protocol == htons(ETH_P_ARP);
}

+static void cxgb3_process_iscsi_prov_pack(struct port_info *pi,
+ struct sk_buff *skb)
+{
+ if (is_arp(skb)) {
+ cxgb3_arp_process(pi, skb);
+ return;
+ }
+
+ if (pi->iscsic.recv)
+ pi->iscsic.recv(pi, skb);
+
+}
+
/**
* rx_eth - process an ingress ethernet packet
* @adap: the adapter
@@ -2024,13 +2035,12 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
vlan_gro_receive(&qs->napi, grp,
ntohs(p->vlan), skb);
else {
- if (unlikely(pi->iscsi_ipv4addr &&
- is_arp(skb))) {
+ if (unlikely(pi->iscsic.flags)) {
unsigned short vtag = ntohs(p->vlan) &
VLAN_VID_MASK;
skb->dev = vlan_group_get_device(grp,
vtag);
- cxgb3_arp_process(adap, skb);
+ cxgb3_process_iscsi_prov_pack(pi, skb);
}
__vlan_hwaccel_rx(skb, grp, ntohs(p->vlan),
rq->polling);
@@ -2041,8 +2051,8 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
if (lro)
napi_gro_receive(&qs->napi, skb);
else {
- if (unlikely(pi->iscsi_ipv4addr && is_arp(skb)))
- cxgb3_arp_process(adap, skb);
+ if (unlikely(pi->iscsic.flags))
+ cxgb3_process_iscsi_prov_pack(pi, skb);
netif_receive_skb(skb);
}
} else

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