fjes: net_device_ops.ndo_start_xmit

This patch adds net_device_ops.ndo_start_xmit callback,
which is called when sending packets.

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 245 insertions, 0 deletions

diff --git a/drivers/net/fjes/fjes.h b/drivers/net/fjes/fjes.h
index f182ed3a4cd1..7af4304f5425 100644
--- a/drivers/net/fjes/fjes.h
+++ b/drivers/net/fjes/fjes.h
@@ -29,6 +29,7 @@
 #define FJES_ACPI_SYMBOL        "Extended Socket"
 #define FJES_MAX_QUEUES         1
 #define FJES_TX_RETRY_INTERVAL  (20 * HZ)
+#define FJES_TX_RETRY_TIMEOUT   (100)
 #define FJES_OPEN_ZONE_UPDATE_WAIT      (300) /* msec */
 
 /* board specific private data structure */
diff --git a/drivers/net/fjes/fjes_hw.c b/drivers/net/fjes/fjes_hw.c
index 1935f48e9e43..487dbc6b7c43 100644
--- a/drivers/net/fjes/fjes_hw.c
+++ b/drivers/net/fjes/fjes_hw.c
@@ -791,3 +791,58 @@ int fjes_hw_wait_epstop(struct fjes_hw *hw)
         return (wait_time < FJES_COMMAND_EPSTOP_WAIT_TIMEOUT * 1000)
                         ? 0 : -EBUSY;
 }
+
+bool fjes_hw_check_epbuf_version(struct epbuf_handler *epbh, u32 version)
+{
+        union ep_buffer_info *info = epbh->info;
+
+        return (info->common.version == version);
+}
+
+bool fjes_hw_check_mtu(struct epbuf_handler *epbh, u32 mtu)
+{
+        union ep_buffer_info *info = epbh->info;
+
+        return (info->v1i.frame_max == FJES_MTU_TO_FRAME_SIZE(mtu));
+}
+
+bool fjes_hw_check_vlan_id(struct epbuf_handler *epbh, u16 vlan_id)
+{
+        union ep_buffer_info *info = epbh->info;
+        bool ret = false;
+        int i;
+
+        if (vlan_id == 0) {
+                ret = true;
+        } else {
+                for (i = 0; i < EP_BUFFER_SUPPORT_VLAN_MAX; i++) {
+                        if (vlan_id == info->v1i.vlan_id[i]) {
+                                ret = true;
+                                break;
+                        }
+                }
+        }
+        return ret;
+}
+
+int fjes_hw_epbuf_tx_pkt_send(struct epbuf_handler *epbh,
+                              void *frame, size_t size)
+{
+        union ep_buffer_info *info = epbh->info;
+        struct esmem_frame *ring_frame;
+
+        if (EP_RING_FULL(info->v1i.head, info->v1i.tail, info->v1i.count_max))
+                return -ENOBUFS;
+
+        ring_frame = (struct esmem_frame *)&(epbh->ring[EP_RING_INDEX
+                                             (info->v1i.tail - 1,
+                                              info->v1i.count_max) *
+                                             info->v1i.frame_max]);
+
+        ring_frame->frame_size = size;
+        memcpy((void *)(ring_frame->frame_data), (void *)frame, size);
+
+        EP_RING_INDEX_INC(epbh->info->v1i.tail, info->v1i.count_max);
+
+        return 0;
+}
diff --git a/drivers/net/fjes/fjes_hw.h b/drivers/net/fjes/fjes_hw.h
index 9b8df553f730..07e122614a76 100644
--- a/drivers/net/fjes/fjes_hw.h
+++ b/drivers/net/fjes/fjes_hw.h
@@ -50,6 +50,9 @@ struct fjes_hw;
 
 #define FJES_ZONING_ZONE_TYPE_NONE (0xFF)
 
+#define FJES_TX_DELAY_SEND_NONE         (0)
+#define FJES_TX_DELAY_SEND_PENDING      (1)
+
 #define FJES_RX_STOP_REQ_NONE           (0x0)
 #define FJES_RX_STOP_REQ_DONE           (0x1)
 #define FJES_RX_STOP_REQ_REQUEST        (0x2)
@@ -61,6 +64,11 @@ struct fjes_hw;
 
 #define EP_RING_NUM(buffer_size, frame_size) \
                 (u32)((buffer_size) / (frame_size))
+#define EP_RING_INDEX(_num, _max) (((_num) + (_max)) % (_max))
+#define EP_RING_INDEX_INC(_num, _max) \
+        ((_num) = EP_RING_INDEX((_num) + 1, (_max)))
+#define EP_RING_FULL(_head, _tail, _max)                                \
+        (0 == EP_RING_INDEX(((_tail) - (_head)), (_max)))
 
 #define FJES_MTU_TO_BUFFER_SIZE(mtu) \
         (ETH_HLEN + VLAN_HLEN + (mtu) + ETH_FCS_LEN)
@@ -309,5 +317,9 @@ enum ep_partner_status
 
 bool fjes_hw_epid_is_same_zone(struct fjes_hw *, int);
 int fjes_hw_epid_is_shared(struct fjes_device_shared_info *, int);
+bool fjes_hw_check_epbuf_version(struct epbuf_handler *, u32);
+bool fjes_hw_check_mtu(struct epbuf_handler *, u32);
+bool fjes_hw_check_vlan_id(struct epbuf_handler *, u16);
+int fjes_hw_epbuf_tx_pkt_send(struct epbuf_handler *, void *, size_t);
 
 #endif /* FJES_HW_H_ */
diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
index bd50cbd6915f..220ff3da4521 100644
--- a/drivers/net/fjes/fjes_main.c
+++ b/drivers/net/fjes/fjes_main.c
@@ -51,6 +51,7 @@ static int fjes_open(struct net_device *);
 static int fjes_close(struct net_device *);
 static int fjes_setup_resources(struct fjes_adapter *);
 static void fjes_free_resources(struct fjes_adapter *);
+static netdev_tx_t fjes_xmit_frame(struct sk_buff *, struct net_device *);
 static irqreturn_t fjes_intr(int, void*);
 
 static int fjes_acpi_add(struct acpi_device *);
@@ -212,6 +213,7 @@ static void fjes_free_irq(struct fjes_adapter *adapter)
 static const struct net_device_ops fjes_netdev_ops = {
         .ndo_open               = fjes_open,
         .ndo_stop               = fjes_close,
+        .ndo_start_xmit         = fjes_xmit_frame,
 };
 
 /* fjes_open - Called when a network interface is made active */
@@ -402,6 +404,181 @@ static void fjes_free_resources(struct fjes_adapter *adapter)
         }
 }
 
+static int fjes_tx_send(struct fjes_adapter *adapter, int dest,
+                        void *data, size_t len)
+{
+        int retval;
+
+        retval = fjes_hw_epbuf_tx_pkt_send(&adapter->hw.ep_shm_info[dest].tx,
+                                           data, len);
+        if (retval)
+                return retval;
+
+        adapter->hw.ep_shm_info[dest].tx.info->v1i.tx_status =
+                FJES_TX_DELAY_SEND_PENDING;
+
+        retval = 0;
+        return retval;
+}
+
+static netdev_tx_t
+fjes_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+        struct fjes_adapter *adapter = netdev_priv(netdev);
+        struct fjes_hw *hw = &adapter->hw;
+
+        int max_epid, my_epid, dest_epid;
+        enum ep_partner_status pstatus;
+        struct netdev_queue *cur_queue;
+        char shortpkt[VLAN_ETH_HLEN];
+        bool is_multi, vlan;
+        struct ethhdr *eth;
+        u16 queue_no = 0;
+        u16 vlan_id = 0;
+        netdev_tx_t ret;
+        char *data;
+        int len;
+
+        ret = NETDEV_TX_OK;
+        is_multi = false;
+        cur_queue = netdev_get_tx_queue(netdev, queue_no);
+
+        eth = (struct ethhdr *)skb->data;
+        my_epid = hw->my_epid;
+
+        vlan = (vlan_get_tag(skb, &vlan_id) == 0) ? true : false;
+
+        data = skb->data;
+        len = skb->len;
+
+        if (is_multicast_ether_addr(eth->h_dest)) {
+                dest_epid = 0;
+                max_epid = hw->max_epid;
+                is_multi = true;
+        } else if (is_local_ether_addr(eth->h_dest)) {
+                dest_epid = eth->h_dest[ETH_ALEN - 1];
+                max_epid = dest_epid + 1;
+
+                if ((eth->h_dest[0] == 0x02) &&
+                    (0x00 == (eth->h_dest[1] | eth->h_dest[2] |
+                              eth->h_dest[3] | eth->h_dest[4])) &&
+                    (dest_epid < hw->max_epid)) {
+                        ;
+                } else {
+                        dest_epid = 0;
+                        max_epid = 0;
+                        ret = NETDEV_TX_OK;
+
+                        adapter->stats64.tx_packets += 1;
+                        hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
+                        adapter->stats64.tx_bytes += len;
+                        hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
+                }
+        } else {
+                dest_epid = 0;
+                max_epid = 0;
+                ret = NETDEV_TX_OK;
+
+                adapter->stats64.tx_packets += 1;
+                hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
+                adapter->stats64.tx_bytes += len;
+                hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
+        }
+
+        for (; dest_epid < max_epid; dest_epid++) {
+                if (my_epid == dest_epid)
+                        continue;
+
+                pstatus = fjes_hw_get_partner_ep_status(hw, dest_epid);
+                if (pstatus != EP_PARTNER_SHARED) {
+                        ret = NETDEV_TX_OK;
+                } else if (!fjes_hw_check_epbuf_version(
+                                &adapter->hw.ep_shm_info[dest_epid].rx, 0)) {
+                        /* version is NOT 0 */
+                        adapter->stats64.tx_carrier_errors += 1;
+                        hw->ep_shm_info[my_epid].net_stats
+                                                .tx_carrier_errors += 1;
+
+                        ret = NETDEV_TX_OK;
+                } else if (!fjes_hw_check_mtu(
+                                &adapter->hw.ep_shm_info[dest_epid].rx,
+                                netdev->mtu)) {
+                        adapter->stats64.tx_dropped += 1;
+                        hw->ep_shm_info[my_epid].net_stats.tx_dropped += 1;
+                        adapter->stats64.tx_errors += 1;
+                        hw->ep_shm_info[my_epid].net_stats.tx_errors += 1;
+
+                        ret = NETDEV_TX_OK;
+                } else if (vlan &&
+                           !fjes_hw_check_vlan_id(
+                                &adapter->hw.ep_shm_info[dest_epid].rx,
+                                vlan_id)) {
+                        ret = NETDEV_TX_OK;
+                } else {
+                        if (len < VLAN_ETH_HLEN) {
+                                memset(shortpkt, 0, VLAN_ETH_HLEN);
+                                memcpy(shortpkt, skb->data, skb->len);
+                                len = VLAN_ETH_HLEN;
+                                data = shortpkt;
+                        }
+
+                        if (adapter->tx_retry_count == 0) {
+                                adapter->tx_start_jiffies = jiffies;
+                                adapter->tx_retry_count = 1;
+                        } else {
+                                adapter->tx_retry_count++;
+                        }
+
+                        if (fjes_tx_send(adapter, dest_epid, data, len)) {
+                                if (is_multi) {
+                                        ret = NETDEV_TX_OK;
+                                } else if (
+                                           ((long)jiffies -
+                                            (long)adapter->tx_start_jiffies) >=
+                                            FJES_TX_RETRY_TIMEOUT) {
+                                        adapter->stats64.tx_fifo_errors += 1;
+                                        hw->ep_shm_info[my_epid].net_stats
+                                                                .tx_fifo_errors += 1;
+                                        adapter->stats64.tx_errors += 1;
+                                        hw->ep_shm_info[my_epid].net_stats
+                                                                .tx_errors += 1;
+
+                                        ret = NETDEV_TX_OK;
+                                } else {
+                                        netdev->trans_start = jiffies;
+                                        netif_tx_stop_queue(cur_queue);
+
+                                        ret = NETDEV_TX_BUSY;
+                                }
+                        } else {
+                                if (!is_multi) {
+                                        adapter->stats64.tx_packets += 1;
+                                        hw->ep_shm_info[my_epid].net_stats
+                                                                .tx_packets += 1;
+                                        adapter->stats64.tx_bytes += len;
+                                        hw->ep_shm_info[my_epid].net_stats
+                                                                .tx_bytes += len;
+                                }
+
+                                adapter->tx_retry_count = 0;
+                                ret = NETDEV_TX_OK;
+                        }
+                }
+        }
+
+        if (ret == NETDEV_TX_OK) {
+                dev_kfree_skb(skb);
+                if (is_multi) {
+                        adapter->stats64.tx_packets += 1;
+                        hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
+                        adapter->stats64.tx_bytes += 1;
+                        hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
+                }
+        }
+
+        return ret;
+}
+
 static irqreturn_t fjes_intr(int irq, void *data)
 {
         struct fjes_adapter *adapter = data;