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Message-Id: <1437610236-12490-11-git-send-email-izumi.taku@jp.fujitsu.com>
Date: Thu, 23 Jul 2015 09:10:25 +0900
From: Taku Izumi <izumi.taku@...fujitsu.com>
To: netdev@...r.kernel.org, davem@...emloft.net
Cc: platform-driver-x86@...r.kernel.org, dvhart@...radead.org,
rkhan@...hat.com, alexander.h.duyck@...hat.com,
linux-acpi@...r.kernel.org, joe@...ches.com,
sergei.shtylyov@...entembedded.com, stephen@...workplumber.org,
yasu.isimatu@...il.com, Taku Izumi <izumi.taku@...fujitsu.com>
Subject: [PATCH v2.1 11/22] fjes: NAPI polling function
This patch adds NAPI polling function and receive related work.
Signed-off-by: Taku Izumi <izumi.taku@...fujitsu.com>
---
drivers/net/fjes/fjes_hw.c | 40 ++++++++++
drivers/net/fjes/fjes_hw.h | 5 ++
drivers/net/fjes/fjes_main.c | 172 ++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 215 insertions(+), 2 deletions(-)
diff --git a/drivers/net/fjes/fjes_hw.c b/drivers/net/fjes/fjes_hw.c
index 4965791..ae7b7cd 100644
--- a/drivers/net/fjes/fjes_hw.c
+++ b/drivers/net/fjes/fjes_hw.c
@@ -825,6 +825,46 @@ bool fjes_hw_check_vlan_id(struct epbuf_handler *epbh, u16 vlan_id)
return ret;
}
+bool fjes_hw_epbuf_rx_is_empty(struct epbuf_handler *epbh)
+{
+ union ep_buffer_info *info = epbh->info;
+
+ if (info->v1i.count_max == 0)
+ return true;
+
+ return EP_RING_EMPTY(info->v1i.head, info->v1i.tail,
+ info->v1i.count_max);
+}
+
+void *fjes_hw_epbuf_rx_curpkt_get_addr(struct epbuf_handler *epbh,
+ size_t *psize)
+{
+ union ep_buffer_info *info = epbh->info;
+ struct esmem_frame *ring_frame;
+ void *frame;
+
+ ring_frame = (struct esmem_frame *)&(epbh->ring[EP_RING_INDEX
+ (info->v1i.head,
+ info->v1i.count_max) *
+ info->v1i.frame_max]);
+
+ *psize = (size_t)ring_frame->frame_size;
+
+ frame = ring_frame->frame_data;
+
+ return frame;
+}
+
+void fjes_hw_epbuf_rx_curpkt_drop(struct epbuf_handler *epbh)
+{
+ union ep_buffer_info *info = epbh->info;
+
+ if (fjes_hw_epbuf_rx_is_empty(epbh))
+ return;
+
+ EP_RING_INDEX_INC(epbh->info->v1i.head, info->v1i.count_max);
+}
+
int fjes_hw_epbuf_tx_pkt_send(struct epbuf_handler *epbh,
void *frame, size_t size)
{
diff --git a/drivers/net/fjes/fjes_hw.h b/drivers/net/fjes/fjes_hw.h
index 2b49421..0b43bc3 100644
--- a/drivers/net/fjes/fjes_hw.h
+++ b/drivers/net/fjes/fjes_hw.h
@@ -69,6 +69,8 @@ struct fjes_hw;
((_num) = EP_RING_INDEX((_num) + 1, (_max)))
#define EP_RING_FULL(_head, _tail, _max) \
(0 == EP_RING_INDEX(((_tail) - (_head)), (_max)))
+#define EP_RING_EMPTY(_head, _tail, _max) \
+ (1 == EP_RING_INDEX(((_tail) - (_head)), (_max)))
#define FJES_MTU_TO_BUFFER_SIZE(mtu) \
(ETH_HLEN + VLAN_HLEN + (mtu) + ETH_FCS_LEN)
@@ -320,6 +322,9 @@ 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);
+bool fjes_hw_epbuf_rx_is_empty(struct epbuf_handler *);
+void *fjes_hw_epbuf_rx_curpkt_get_addr(struct epbuf_handler *, size_t *);
+void fjes_hw_epbuf_rx_curpkt_drop(struct epbuf_handler *);
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 8cc687e..186197d 100644
--- a/drivers/net/fjes/fjes_main.c
+++ b/drivers/net/fjes/fjes_main.c
@@ -66,6 +66,9 @@ static int fjes_remove(struct platform_device *);
static int fjes_sw_init(struct fjes_adapter *);
static void fjes_netdev_setup(struct net_device *);
+static void fjes_rx_irq(struct fjes_adapter *, int);
+static int fjes_poll(struct napi_struct *, int);
+
static const struct acpi_device_id fjes_acpi_ids[] = {
{"PNP0C02", 0},
{"", 0},
@@ -235,6 +238,8 @@ static int fjes_open(struct net_device *netdev)
hw->txrx_stop_req_bit = 0;
hw->epstop_req_bit = 0;
+ napi_enable(&adapter->napi);
+
fjes_hw_capture_interrupt_status(hw);
result = fjes_request_irq(adapter);
@@ -250,6 +255,7 @@ static int fjes_open(struct net_device *netdev)
err_req_irq:
fjes_free_irq(adapter);
+ napi_disable(&adapter->napi);
err_setup_res:
fjes_free_resources(adapter);
@@ -268,6 +274,8 @@ static int fjes_close(struct net_device *netdev)
fjes_hw_raise_epstop(hw);
+ napi_disable(&adapter->napi);
+
for (epidx = 0; epidx < hw->max_epid; epidx++) {
if (epidx == hw->my_epid)
continue;
@@ -703,14 +711,168 @@ static irqreturn_t fjes_intr(int irq, void *data)
icr = fjes_hw_capture_interrupt_status(hw);
- if (icr & REG_IS_MASK_IS_ASSERT)
+ if (icr & REG_IS_MASK_IS_ASSERT) {
+ if (icr & REG_ICTL_MASK_RX_DATA)
+ fjes_rx_irq(adapter, icr & REG_IS_MASK_EPID);
+
ret = IRQ_HANDLED;
- else
+ } else {
ret = IRQ_NONE;
+ }
return ret;
}
+static int fjes_rxframe_search_exist(struct fjes_adapter *adapter,
+ int start_epid)
+{
+ struct fjes_hw *hw = &adapter->hw;
+ int cur_epid;
+ int max_epid;
+ int i;
+ enum ep_partner_status pstatus;
+
+ max_epid = hw->max_epid;
+ start_epid = (start_epid + 1 + max_epid) % max_epid;
+
+ for (i = 0; i < max_epid; i++) {
+ cur_epid = (start_epid + i) % max_epid;
+ if (cur_epid == hw->my_epid)
+ continue;
+
+ pstatus = fjes_hw_get_partner_ep_status(hw, cur_epid);
+ if (pstatus == EP_PARTNER_SHARED) {
+ if (!fjes_hw_epbuf_rx_is_empty(
+ &hw->ep_shm_info[cur_epid].rx))
+ return cur_epid;
+ }
+ }
+ return -1;
+}
+
+static void *fjes_rxframe_get(struct fjes_adapter *adapter, size_t *psize,
+ int *cur_epid)
+{
+ void *frame;
+
+ *cur_epid = fjes_rxframe_search_exist(adapter, *cur_epid);
+ if (*cur_epid < 0)
+ return NULL;
+
+ frame =
+ fjes_hw_epbuf_rx_curpkt_get_addr(
+ &adapter->hw.ep_shm_info[*cur_epid].rx, psize);
+
+ return frame;
+}
+
+static void fjes_rxframe_release(struct fjes_adapter *adapter, int cur_epid)
+{
+ fjes_hw_epbuf_rx_curpkt_drop(&adapter->hw.ep_shm_info[cur_epid].rx);
+}
+
+static void fjes_rx_irq(struct fjes_adapter *adapter, int src_epid)
+{
+ struct fjes_hw *hw = &adapter->hw;
+
+ fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, true);
+
+ adapter->unset_rx_last = true;
+ napi_schedule(&adapter->napi);
+}
+
+static int fjes_poll(struct napi_struct *napi, int budget)
+{
+ struct fjes_adapter *adapter =
+ container_of(napi, struct fjes_adapter, napi);
+ struct fjes_hw *hw = &adapter->hw;
+ struct net_device *netdev = napi->dev;
+ int work_done = 0;
+ struct sk_buff *skb;
+ void *frame;
+ size_t frame_len;
+ int cur_epid = 0;
+ int epidx = 0;
+
+ for (epidx = 0; epidx < hw->max_epid; epidx++) {
+ if (epidx == hw->my_epid)
+ continue;
+
+ adapter->hw.ep_shm_info[epidx].tx.info->v1i.rx_status |=
+ FJES_RX_POLL_WORK;
+ }
+
+ while (work_done < budget) {
+ prefetch(&adapter->hw);
+ frame = fjes_rxframe_get(adapter, &frame_len, &cur_epid);
+
+ if (frame) {
+ skb = napi_alloc_skb(napi, frame_len);
+ if (!skb) {
+ adapter->stats64.rx_dropped += 1;
+ hw->ep_shm_info[cur_epid].net_stats
+ .rx_dropped += 1;
+ adapter->stats64.rx_errors += 1;
+ hw->ep_shm_info[cur_epid].net_stats
+ .rx_errors += 1;
+ } else {
+ memcpy(skb_put(skb, frame_len),
+ frame, frame_len);
+ skb->protocol = eth_type_trans(skb, netdev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ netif_receive_skb(skb);
+
+ work_done++;
+
+ adapter->stats64.rx_packets += 1;
+ hw->ep_shm_info[cur_epid].net_stats
+ .rx_packets += 1;
+ adapter->stats64.rx_bytes += frame_len;
+ hw->ep_shm_info[cur_epid].net_stats
+ .rx_bytes += frame_len;
+
+ if (is_multicast_ether_addr(
+ ((struct ethhdr *)frame)->h_dest)) {
+ adapter->stats64.multicast += 1;
+ hw->ep_shm_info[cur_epid].net_stats
+ .multicast += 1;
+ }
+ }
+
+ fjes_rxframe_release(adapter, cur_epid);
+ adapter->unset_rx_last = true;
+ } else {
+ break;
+ }
+ }
+
+ if (work_done < budget) {
+ napi_complete(napi);
+
+ if (adapter->unset_rx_last) {
+ adapter->rx_last_jiffies = jiffies;
+ adapter->unset_rx_last = false;
+ }
+
+ if (((long)jiffies - (long)adapter->rx_last_jiffies) < 3) {
+ napi_reschedule(napi);
+ } else {
+ for (epidx = 0; epidx < hw->max_epid; epidx++) {
+ if (epidx == hw->my_epid)
+ continue;
+ adapter->hw.ep_shm_info[epidx]
+ .tx.info->v1i.rx_status &=
+ ~FJES_RX_POLL_WORK;
+ }
+
+ fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, false);
+ }
+ }
+
+ return work_done;
+}
+
/* fjes_probe - Device Initialization Routine */
static int fjes_probe(struct platform_device *plat_dev)
{
@@ -800,6 +962,8 @@ static int fjes_remove(struct platform_device *plat_dev)
fjes_hw_exit(hw);
+ netif_napi_del(&adapter->napi);
+
free_netdev(netdev);
return 0;
@@ -807,6 +971,10 @@ static int fjes_remove(struct platform_device *plat_dev)
static int fjes_sw_init(struct fjes_adapter *adapter)
{
+ struct net_device *netdev = adapter->netdev;
+
+ netif_napi_add(netdev, &adapter->napi, fjes_poll, 64);
+
return 0;
}
--
1.8.3.1
--
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