nvethernet: Support of NVGRO for NVUSO segments

Algorithm:
- There is one master queue and one final queue to maintain the
packets.
- Final queue will start when a packet received with TTL=1
- TTL = 2 and 3 packets will be queued into final if those are in
sequence else those will be queued to master queue.
- When packet received with TTL = 2 then only merge process will start
- For every valid final queue merge starts by looking at the IPID
in master queue in increment order. This loop continues until
TTL = 2 found in master queue.
- Once TTL = 2 found then entire final queue will be given GRO
layer in sequential order.

Bug 3106903

Change-Id: I6cc08f3faae67a04813d32d59f7cce02f06dccbf
Signed-off-by: Bhadram Varka <vbhadram@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2554423
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: Narayan Reddy <narayanr@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/net/ethernet/nvidia/nvethernet/ether_linux.h

@@ -65,6 +65,12 @@
 #ifdef MACSEC_SUPPORT
 #include "macsec.h"
 #endif
+#ifdef ETHER_NVGRO
+#include <net/inet_common.h>
+#include <uapi/linux/ip.h>
+#include <net/udp.h>
+#endif /* ETHER_NVGRO */
+
 /**
  * @brief Max number of Ethernet IRQs supported in HW
  */
@@ -201,6 +207,14 @@
 #define ETHER_ADDRESS_MAC		1
 #define ETHER_ADDRESS_BC		0
 
+#ifdef ETHER_NVGRO
+/* NVGRO packets purge threshold in msec */
+#define NVGRO_AGE_THRESHOLD		500
+#define NVGRO_PURGE_TIMER_THRESHOLD	5000
+#define NVGRO_RX_RUNNING		OSI_BIT(0)
+#define NVGRO_PURGE_TIMER_RUNNING	OSI_BIT(1)
+#endif
+
 /**
  * @brief Check if Tx data buffer length is within bounds.
  *
@@ -525,6 +539,26 @@ struct ether_priv_data {
 	int phy_reset_post_delay;
 	/** PHY reset duration delay */
 	int phy_reset_duration;
+#ifdef ETHER_NVGRO
+	/** Master queue */
+	struct sk_buff_head mq;
+	/** Master queue */
+	struct sk_buff_head fq;
+	/** expected IP ID */
+	u16 expected_ip_id;
+	/** Timer for purginging the packets in FQ and MQ based on threshold */
+	struct timer_list nvgro_timer;
+	/** Rx processing state for NVGRO */
+	atomic_t rx_state;
+	/** Purge timer state for NVGRO */
+	atomic_t timer_state;
+	/** NVGRO packet age threshold in milseconds */
+	u32 pkt_age_msec;
+	/** NVGRO purge timer interval */
+	u32 nvgro_timer_intrvl;
+	/** NVGRO packet dropped count */
+	u64 nvgro_dropped;
+#endif
 };
 
 /**
@@ -681,4 +715,7 @@ void ether_set_rx_mode(struct net_device *dev);
 int ether_tc_setup_taprio(struct ether_priv_data *pdata,
 			  struct tc_taprio_qopt_offload *qopt);
 #endif
+#ifdef ETHER_NVGRO
+void ether_nvgro_purge_timer(struct timer_list *t);
+#endif /* ETHER_NVGRO */
 #endif /* ETHER_LINUX_H */