forcedeth: remove duplicate structure member in rx

Since both first_rx and rx_ring are the head of rx ring, it not
necessary to use two structure members to statically indicate
the head of rx ring. So first_rx is removed.

CC: Srinivas Eeda <srinivas.eeda@oracle.com>
CC: Joe Jin <joe.jin@oracle.com>
CC: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index a79b9f8..21e15cb 100644 (file)
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -793,7 +793,7 @@ struct fe_priv {
        /* rx specific fields.
         * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
         */
-       union ring_type get_rx, put_rx, first_rx, last_rx;
+       union ring_type get_rx, put_rx, last_rx;
        struct nv_skb_map *get_rx_ctx, *put_rx_ctx;
        struct nv_skb_map *first_rx_ctx, *last_rx_ctx;
        struct nv_skb_map *rx_skb;
@@ -1812,7 +1812,7 @@ static int nv_alloc_rx(struct net_device *dev)
        struct ring_desc *less_rx;
 
        less_rx = np->get_rx.orig;
-       if (less_rx-- == np->first_rx.orig)
+       if (less_rx-- == np->rx_ring.orig)
                less_rx = np->last_rx.orig;
 
        while (np->put_rx.orig != less_rx) {
@@ -1833,7 +1833,7 @@ static int nv_alloc_rx(struct net_device *dev)
                        wmb();
                        np->put_rx.orig->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX_AVAIL);
                        if (unlikely(np->put_rx.orig++ == np->last_rx.orig))
-                               np->put_rx.orig = np->first_rx.orig;
+                               np->put_rx.orig = np->rx_ring.orig;
                        if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
                                np->put_rx_ctx = np->first_rx_ctx;
                } else {
@@ -1853,7 +1853,7 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
        struct ring_desc_ex *less_rx;
 
        less_rx = np->get_rx.ex;
-       if (less_rx-- == np->first_rx.ex)
+       if (less_rx-- == np->rx_ring.ex)
                less_rx = np->last_rx.ex;
 
        while (np->put_rx.ex != less_rx) {
@@ -1875,7 +1875,7 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
                        wmb();
                        np->put_rx.ex->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX2_AVAIL);
                        if (unlikely(np->put_rx.ex++ == np->last_rx.ex))
-                               np->put_rx.ex = np->first_rx.ex;
+                               np->put_rx.ex = np->rx_ring.ex;
                        if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
                                np->put_rx_ctx = np->first_rx_ctx;
                } else {
@@ -1903,7 +1903,8 @@ static void nv_init_rx(struct net_device *dev)
        struct fe_priv *np = netdev_priv(dev);
        int i;
 
-       np->get_rx = np->put_rx = np->first_rx = np->rx_ring;
+       np->get_rx = np->rx_ring;
+       np->put_rx = np->rx_ring;
 
        if (!nv_optimized(np))
                np->last_rx.orig = &np->rx_ring.orig[np->rx_ring_size-1];
@@ -2911,7 +2912,7 @@ static int nv_rx_process(struct net_device *dev, int limit)
                u64_stats_update_end(&np->swstats_rx_syncp);
 next_pkt:
                if (unlikely(np->get_rx.orig++ == np->last_rx.orig))
-                       np->get_rx.orig = np->first_rx.orig;
+                       np->get_rx.orig = np->rx_ring.orig;
                if (unlikely(np->get_rx_ctx++ == np->last_rx_ctx))
                        np->get_rx_ctx = np->first_rx_ctx;
 
@@ -3000,7 +3001,7 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
                }
 next_pkt:
                if (unlikely(np->get_rx.ex++ == np->last_rx.ex))
-                       np->get_rx.ex = np->first_rx.ex;
+                       np->get_rx.ex = np->rx_ring.ex;
                if (unlikely(np->get_rx_ctx++ == np->last_rx_ctx))
                        np->get_rx_ctx = np->first_rx_ctx;