From: David Marchand <david.marchand@6wind.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH 3/5] ethdev: add mtu accessors
Date: Mon, 26 May 2014 13:31:30 +0200 [thread overview]
Message-ID: <1401103892-17225-4-git-send-email-david.marchand@6wind.com> (raw)
In-Reply-To: <1401103892-17225-1-git-send-email-david.marchand@6wind.com>
From: Samuel Gauthier <samuel.gauthier@6wind.com>
This patch adds two new functions in ethdev api to retrieve current MTU and
change MTU of a port.
These operations have been implemented for rte_em_pmd, rte_igb_pmd and
rte_ixgbe_pmd.
Signed-off-by: Samuel Gauthier <samuel.gauthier@6wind.com>
Signed-off-by: Ivan Boule <ivan.boule@6wind.com>
Signed-off-by: David Marchand <david.marchand@6wind.com>
---
lib/librte_ether/rte_ethdev.c | 31 +++++++++++++++++
lib/librte_ether/rte_ethdev.h | 37 ++++++++++++++++++++
lib/librte_pmd_e1000/e1000_ethdev.h | 4 +++
lib/librte_pmd_e1000/em_ethdev.c | 64 +++++++++++++++++++++++++++++++++++
lib/librte_pmd_e1000/em_rxtx.c | 11 ++++++
lib/librte_pmd_e1000/igb_ethdev.c | 64 +++++++++++++++++++++++++++++++++++
lib/librte_pmd_e1000/igb_rxtx.c | 10 ++++++
lib/librte_pmd_ixgbe/ixgbe_ethdev.c | 62 +++++++++++++++++++++++++++++++++
lib/librte_pmd_ixgbe/ixgbe_ethdev.h | 2 ++
lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 10 ++++++
10 files changed, 295 insertions(+)
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 31c18ef..ece2a68 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1058,6 +1058,37 @@ rte_eth_macaddr_get(uint8_t port_id, struct ether_addr *mac_addr)
ether_addr_copy(&dev->data->mac_addrs[0], mac_addr);
}
+
+int
+rte_eth_dev_get_mtu(uint8_t port_id, uint16_t *mtu)
+{
+ struct rte_eth_dev *dev;
+
+ if (port_id >= nb_ports) {
+ PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+ return (-ENODEV);
+ }
+
+ dev = &rte_eth_devices[port_id];
+ FUNC_PTR_OR_ERR_RET(*dev->dev_ops->mtu_get, -ENOTSUP);
+ return (*dev->dev_ops->mtu_get)(dev, mtu);
+}
+
+int
+rte_eth_dev_set_mtu(uint8_t port_id, uint16_t *mtu)
+{
+ struct rte_eth_dev *dev;
+
+ if (port_id >= nb_ports) {
+ PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
+ return (-ENODEV);
+ }
+
+ dev = &rte_eth_devices[port_id];
+ FUNC_PTR_OR_ERR_RET(*dev->dev_ops->mtu_set, -ENOTSUP);
+ return (*dev->dev_ops->mtu_set)(dev, mtu);
+}
+
int
rte_eth_dev_vlan_filter(uint8_t port_id, uint16_t vlan_id, int on)
{
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 39351ea..177a6ec 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -890,6 +890,12 @@ typedef uint32_t (*eth_rx_queue_count_t)(struct rte_eth_dev *dev,
typedef int (*eth_rx_descriptor_done_t)(void *rxq, uint16_t offset);
/**< @Check DD bit of specific RX descriptor */
+typedef int (*mtu_get_t)(struct rte_eth_dev *dev, uint16_t *mtu);
+/**< @internal Get MTU. */
+
+typedef int (*mtu_set_t)(struct rte_eth_dev *dev, uint16_t *mtu);
+/**< @internal Set MTU. */
+
typedef int (*vlan_filter_set_t)(struct rte_eth_dev *dev,
uint16_t vlan_id,
int on);
@@ -1113,6 +1119,8 @@ struct eth_dev_ops {
eth_queue_stats_mapping_set_t queue_stats_mapping_set;
/**< Configure per queue stat counter mapping. */
eth_dev_infos_get_t dev_infos_get; /**< Get device info. */
+ mtu_get_t mtu_get; /**< Get MTU. */
+ mtu_set_t mtu_set; /**< Set MTU. */
vlan_filter_set_t vlan_filter_set; /**< Filter VLAN Setup. */
vlan_tpid_set_t vlan_tpid_set; /**< Outer VLAN TPID Setup. */
vlan_strip_queue_set_t vlan_strip_queue_set; /**< VLAN Stripping on queue. */
@@ -1680,6 +1688,35 @@ extern void rte_eth_dev_info_get(uint8_t port_id,
struct rte_eth_dev_info *dev_info);
/**
+ * Retrieve the MTU of an Ethernet device.
+ *
+ * @param port_id
+ * The port identifier of the Ethernet device.
+ * @param mtu
+ * A pointer to a uint16_t where the retrieved MTU is to be stored.
+ * @return
+ * - (0) if successful.
+ * - (-ENOSUP) if operation is not supported.
+ * - (-ENODEV) if *port_id* invalid.
+ */
+extern int rte_eth_dev_get_mtu(uint8_t port_id, uint16_t *mtu);
+
+/**
+ * Change the MTU of an Ethernet device.
+ *
+ * @param port_id
+ * The port identifier of the Ethernet device.
+ * @param mtu
+ * A pointer to a uint16_t where the MTU to be applied is stored.
+ * @return
+ * - (0) if successful.
+ * - (-ENOSUP) if operation is not supported.
+ * - (-ENODEV) if *port_id* invalid.
+ * - (-EINVAL) if *mtu* invalid.
+ */
+extern int rte_eth_dev_set_mtu(uint8_t port_id, uint16_t *mtu);
+
+/**
* Enable/Disable hardware filtering by an Ethernet device of received
* VLAN packets tagged with a given VLAN Tag Identifier.
*
diff --git a/lib/librte_pmd_e1000/e1000_ethdev.h b/lib/librte_pmd_e1000/e1000_ethdev.h
index 8790601..5cbf436 100644
--- a/lib/librte_pmd_e1000/e1000_ethdev.h
+++ b/lib/librte_pmd_e1000/e1000_ethdev.h
@@ -138,6 +138,8 @@ uint16_t eth_igb_recv_pkts(void *rxq, struct rte_mbuf **rx_pkts,
uint16_t eth_igb_recv_scattered_pkts(void *rxq,
struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
+void eth_igb_dev_set_rx_scatter_mode(struct rte_eth_dev *dev);
+
int eth_igb_rss_hash_update(struct rte_eth_dev *dev,
struct rte_eth_rss_conf *rss_conf);
@@ -192,4 +194,6 @@ uint16_t eth_em_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t eth_em_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts);
+void eth_em_set_rx_scatter_mode(struct rte_eth_dev *dev);
+
#endif /* _E1000_ETHDEV_H_ */
diff --git a/lib/librte_pmd_e1000/em_ethdev.c b/lib/librte_pmd_e1000/em_ethdev.c
index c148cbc..044d73f 100644
--- a/lib/librte_pmd_e1000/em_ethdev.c
+++ b/lib/librte_pmd_e1000/em_ethdev.c
@@ -94,6 +94,9 @@ static void em_hw_control_release(struct e1000_hw *hw);
static void em_init_manageability(struct e1000_hw *hw);
static void em_release_manageability(struct e1000_hw *hw);
+static int eth_em_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+static int eth_em_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+
static int eth_em_vlan_filter_set(struct rte_eth_dev *dev,
uint16_t vlan_id, int on);
static void eth_em_vlan_offload_set(struct rte_eth_dev *dev, int mask);
@@ -145,6 +148,8 @@ static struct eth_dev_ops eth_em_ops = {
.stats_get = eth_em_stats_get,
.stats_reset = eth_em_stats_reset,
.dev_infos_get = eth_em_infos_get,
+ .mtu_get = eth_em_get_mtu,
+ .mtu_set = eth_em_set_mtu,
.vlan_filter_set = eth_em_vlan_filter_set,
.vlan_offload_set = eth_em_vlan_offload_set,
.rx_queue_setup = eth_em_rx_queue_setup,
@@ -1487,6 +1492,65 @@ eth_em_rar_clear(struct rte_eth_dev *dev, uint32_t index)
e1000_rar_set(hw, addr, index);
}
+static int
+eth_em_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ *mtu = (uint16_t) dev->data->dev_conf.rxmode.max_rx_pkt_len;
+ return 0;
+}
+
+static uint32_t
+em_get_rctl_buffer_size(uint32_t rctl)
+{
+ uint32_t rctl_buf_size;
+
+ static uint16_t std_buf_sizes[4] = {
+ 2048, 1024, 512, 256,
+ };
+ static uint16_t ext_buf_sizes[4] = {
+ 0 /* invalid */, 16384, 8192, 4096,
+ };
+
+ rctl_buf_size = ((rctl & 0x00030000) >> 16);
+ if (rctl & E1000_RCTL_BSEX)
+ return (uint32_t) ext_buf_sizes[rctl_buf_size];
+ else
+ return (uint32_t) std_buf_sizes[rctl_buf_size];
+}
+
+static int
+eth_em_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ struct e1000_hw *hw;
+ uint32_t frame_size;
+ uint32_t rx_buf_size;
+ uint32_t rctl;
+
+ frame_size = *mtu + ETHER_HDR_LEN + ETHER_CRC_LEN + VLAN_TAG_SIZE;
+ hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ /* check that mtu is within the allowed range */
+ if ((*mtu < 68) || (frame_size > em_get_max_pktlen(hw)))
+ return -EINVAL;
+
+ rctl = E1000_READ_REG(hw, E1000_RCTL);
+ rx_buf_size = em_get_rctl_buffer_size(rctl); /* set at init time. */
+ /* switch to jumbo mode if needed */
+ if (frame_size > rx_buf_size) {
+ eth_em_set_rx_scatter_mode(dev);
+ dev->data->dev_conf.rxmode.jumbo_frame = 1;
+ rctl |= E1000_RCTL_LPE;
+ } else {
+ dev->data->dev_conf.rxmode.jumbo_frame = 0;
+ rctl &= ~E1000_RCTL_LPE;
+ }
+ E1000_WRITE_REG(hw, E1000_RCTL, rctl);
+
+ /* update max frame size */
+ dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+ return 0;
+}
+
struct rte_driver em_pmd_drv = {
.type = PMD_PDEV,
.init = rte_em_pmd_init,
diff --git a/lib/librte_pmd_e1000/em_rxtx.c b/lib/librte_pmd_e1000/em_rxtx.c
index 4f98a3f..5e7f74d 100644
--- a/lib/librte_pmd_e1000/em_rxtx.c
+++ b/lib/librte_pmd_e1000/em_rxtx.c
@@ -1063,6 +1063,17 @@ eth_em_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
return (nb_rx);
}
+void
+eth_em_set_rx_scatter_mode(struct rte_eth_dev *dev)
+{
+ if (dev->rx_pkt_burst != eth_em_recv_scattered_pkts) {
+ dev->rx_pkt_burst = (eth_rx_burst_t)eth_em_recv_scattered_pkts;
+ dev->data->scattered_rx = 1;
+ /* make sure this setting is viewed by all cores */
+ rte_wmb();
+ }
+}
+
/*
* Rings setup and release.
*
diff --git a/lib/librte_pmd_e1000/igb_ethdev.c b/lib/librte_pmd_e1000/igb_ethdev.c
index e15fe5a..8f46963 100644
--- a/lib/librte_pmd_e1000/igb_ethdev.c
+++ b/lib/librte_pmd_e1000/igb_ethdev.c
@@ -87,6 +87,9 @@ static void igb_hw_control_release(struct e1000_hw *hw);
static void igb_init_manageability(struct e1000_hw *hw);
static void igb_release_manageability(struct e1000_hw *hw);
+static int eth_igb_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+static int eth_igb_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+
static int eth_igb_vlan_filter_set(struct rte_eth_dev *dev,
uint16_t vlan_id, int on);
static void eth_igb_vlan_tpid_set(struct rte_eth_dev *dev, uint16_t tpid_id);
@@ -180,6 +183,8 @@ static struct eth_dev_ops eth_igb_ops = {
.stats_get = eth_igb_stats_get,
.stats_reset = eth_igb_stats_reset,
.dev_infos_get = eth_igb_infos_get,
+ .mtu_get = eth_igb_get_mtu,
+ .mtu_set = eth_igb_set_mtu,
.vlan_filter_set = eth_igb_vlan_filter_set,
.vlan_tpid_set = eth_igb_vlan_tpid_set,
.vlan_offload_set = eth_igb_vlan_offload_set,
@@ -2238,6 +2243,65 @@ eth_igb_rss_reta_query(struct rte_eth_dev *dev,
return 0;
}
+static int
+eth_igb_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ uint32_t rlpml;
+ struct e1000_hw *hw;
+
+ hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ rlpml = E1000_READ_REG(hw, E1000_RLPML);
+
+ *mtu = (uint16_t) rlpml;
+ return 0;
+}
+
+static int
+eth_igb_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ uint32_t rctl;
+ struct e1000_hw *hw;
+ struct rte_eth_dev_info dev_info;
+ uint32_t frame_size = *mtu + ETHER_HDR_LEN +
+ ETHER_CRC_LEN + VLAN_TAG_SIZE;
+
+ hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+#ifdef RTE_LIBRTE_82571_SUPPORT
+ /* XXX: not bigger than max_rx_pktlen */
+ if (hw->mac.type == e1000_82571)
+ return -ENOTSUP;
+#endif
+ eth_igb_infos_get(dev, &dev_info);
+
+ /* check that mtu is within the allowed range */
+ if ((*mtu < 68) ||
+ (frame_size > dev_info.max_rx_pktlen))
+ return -EINVAL;
+
+ rctl = E1000_READ_REG(hw, E1000_RCTL);
+
+ /* switch to jumbo mode if needed */
+ if (frame_size > ETHER_MAX_LEN) {
+ eth_igb_dev_set_rx_scatter_mode(dev);
+ dev->data->dev_conf.rxmode.jumbo_frame = 1;
+ rctl |= E1000_RCTL_LPE;
+ } else {
+ dev->data->dev_conf.rxmode.jumbo_frame = 0;
+ rctl &= ~E1000_RCTL_LPE;
+ }
+ E1000_WRITE_REG(hw, E1000_RCTL, rctl);
+
+ /* update max frame size */
+ dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+
+ E1000_WRITE_REG(hw, E1000_RLPML,
+ dev->data->dev_conf.rxmode.max_rx_pkt_len);
+
+ return 0;
+}
+
static struct rte_driver pmd_igb_drv = {
.type = PMD_PDEV,
.init = rte_igb_pmd_init,
diff --git a/lib/librte_pmd_e1000/igb_rxtx.c b/lib/librte_pmd_e1000/igb_rxtx.c
index 6b48df5..61ec0ff 100644
--- a/lib/librte_pmd_e1000/igb_rxtx.c
+++ b/lib/librte_pmd_e1000/igb_rxtx.c
@@ -2155,6 +2155,16 @@ eth_igb_tx_init(struct rte_eth_dev *dev)
E1000_WRITE_REG(hw, E1000_TCTL, tctl);
}
+void eth_igb_dev_set_rx_scatter_mode(struct rte_eth_dev *dev)
+{
+ if (dev->rx_pkt_burst != eth_igb_recv_scattered_pkts) {
+ dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
+ /* we must ensure that this is done when we leave the
+ function */
+ rte_wmb();
+ }
+}
+
/*********************************************************************
*
* Enable VF receive unit.
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index c876c3e..b9db1f4 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -114,6 +114,10 @@ static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
uint8_t is_rx);
static void ixgbe_dev_info_get(struct rte_eth_dev *dev,
struct rte_eth_dev_info *dev_info);
+
+static int ixgbe_dev_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+static int ixgbe_dev_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
+
static int ixgbe_vlan_filter_set(struct rte_eth_dev *dev,
uint16_t vlan_id, int on);
static void ixgbe_vlan_tpid_set(struct rte_eth_dev *dev, uint16_t tpid_id);
@@ -264,6 +268,8 @@ static struct eth_dev_ops ixgbe_eth_dev_ops = {
.stats_reset = ixgbe_dev_stats_reset,
.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
.dev_infos_get = ixgbe_dev_info_get,
+ .mtu_get = ixgbe_dev_get_mtu,
+ .mtu_set = ixgbe_dev_set_mtu,
.vlan_filter_set = ixgbe_vlan_filter_set,
.vlan_tpid_set = ixgbe_vlan_tpid_set,
.vlan_offload_set = ixgbe_vlan_offload_set,
@@ -2590,6 +2596,62 @@ ixgbe_remove_rar(struct rte_eth_dev *dev, uint32_t index)
ixgbe_clear_rar(hw, index);
}
+static int
+ixgbe_dev_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ uint32_t maxfrs;
+ struct ixgbe_hw *hw;
+
+ hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
+ *mtu = (uint16_t) (((0xFFFF0000 & maxfrs) >> 16) -
+ ETHER_HDR_LEN - ETHER_CRC_LEN);
+ return 0;
+}
+
+static int
+ixgbe_dev_set_mtu(struct rte_eth_dev *dev, uint16_t *mtu)
+{
+ uint32_t hlreg0;
+ uint32_t maxfrs;
+ struct ixgbe_hw *hw;
+ struct rte_eth_dev_info dev_info;
+ uint32_t frame_size = *mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
+
+ ixgbe_dev_info_get(dev, &dev_info);
+
+ /* check that mtu is within the allowed range */
+ if ((*mtu < 68) ||
+ (frame_size > dev_info.max_rx_pktlen))
+ return -EINVAL;
+
+ hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
+
+ /* switch to jumbo mode if needed */
+ if (frame_size > ETHER_MAX_LEN) {
+ ixgbe_dev_set_rx_scatter_mode(dev);
+ dev->data->dev_conf.rxmode.jumbo_frame = 1;
+ hlreg0 |= IXGBE_HLREG0_JUMBOEN;
+ } else {
+ dev->data->dev_conf.rxmode.jumbo_frame = 0;
+ hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
+ }
+ IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);
+
+ /* update max frame size */
+ dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+
+ maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
+ maxfrs &= 0x0000FFFF;
+ maxfrs |= (dev->data->dev_conf.rxmode.max_rx_pkt_len << 16);
+ IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);
+
+ return 0;
+}
+
/*
* Virtual Function operations
*/
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
index 846db0a..a667ec2 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
@@ -235,6 +235,8 @@ uint16_t ixgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t ixgbe_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts);
+void ixgbe_dev_set_rx_scatter_mode(struct rte_eth_dev *dev);
+
int ixgbe_dev_rss_hash_update(struct rte_eth_dev *dev,
struct rte_eth_rss_conf *rss_conf);
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index 2d2c1a0..b05c1ba 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -3892,3 +3892,13 @@ ixgbevf_dev_rxtx_start(struct rte_eth_dev *dev)
}
}
+
+void ixgbe_dev_set_rx_scatter_mode(struct rte_eth_dev *dev)
+{
+ if (dev->rx_pkt_burst != ixgbe_recv_scattered_pkts) {
+ dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
+ /* we must ensure that this is done when we leave the
+ function */
+ rte_wmb();
+ }
+}
--
1.7.10.4
next prev parent reply other threads:[~2014-05-26 11:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-26 11:31 [dpdk-dev] [PATCH 0/5] add mtu and flow control handlers David Marchand
2014-05-26 11:31 ` [dpdk-dev] [PATCH 1/5] ethdev: retrieve flow control configuration David Marchand
2014-05-26 11:31 ` [dpdk-dev] [PATCH 2/5] ethdev: add autoneg parameter in flow ctrl accessors David Marchand
2014-05-26 11:31 ` David Marchand [this message]
2014-06-10 17:23 ` [dpdk-dev] [PATCH 3/5] ethdev: add mtu accessors Ananyev, Konstantin
2014-06-12 14:20 ` David Marchand
2014-05-26 11:31 ` [dpdk-dev] [PATCH 4/5] ixgbe: add get/set_mtu to ixgbevf David Marchand
2014-05-26 11:31 ` [dpdk-dev] [PATCH 5/5] app/testpmd: allow to configure mtu David Marchand
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