liquidio: fix inaccurate count of napi-processed rx packets reported to Octeon

lio_enable_irq (called by napi poll) is reporting to Octeon an inaccurate
count of processed rx packets causing Octeon to eventually stop forwarding
packets to the host.  Fix it by using this formula for an accurate count:

    processed rx packets = droq->pkt_count - droq->pkts_pending

Also increase SOFT_COMMAND_BUFFER_SIZE to match what the firmware expects.
Signed-off-by: Prasad Kanneganti <prasad.kanneganti@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/octeon_device.c

@@ -1429,13 +1429,15 @@ int lio_get_device_id(void *dev)
 void lio_enable_irq(struct octeon_droq *droq, struct octeon_instr_queue *iq)
 {
 	u64 instr_cnt;
+	u32 pkts_pend;
 	struct octeon_device *oct = NULL;
 
 	/* the whole thing needs to be atomic, ideally */
 	if (droq) {
+		pkts_pend = (u32)atomic_read(&droq->pkts_pending);
 		spin_lock_bh(&droq->lock);
-		writel(droq->pkt_count, droq->pkts_sent_reg);
-		droq->pkt_count = 0;
+		writel(droq->pkt_count - pkts_pend, droq->pkts_sent_reg);
+		droq->pkt_count = pkts_pend;
 		/* this write needs to be flushed before we release the lock */
 		mmiowb();
 		spin_unlock_bh(&droq->lock);

drivers/net/ethernet/cavium/liquidio/octeon_iq.h

@@ -251,7 +251,7 @@ union octeon_instr_64B {
 
 /** The size of each buffer in soft command buffer pool
  */
-#define  SOFT_COMMAND_BUFFER_SIZE	1536
+#define  SOFT_COMMAND_BUFFER_SIZE	2048
 
 struct octeon_soft_command {
 	/** Soft command buffer info. */