vio: create routines for inc,dec vio dring indexes

Both sunvdc and sunvnet implemented distinct functionality for incrementing
and decrementing dring indexes. Create common functions for use by both
from the sunvnet versions, which were chosen since they will still work
correctly in case a non power of two ring size is used.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 23 deletions

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 90c86cd3be14..45c408ef67d0 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -466,23 +466,6 @@ static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
         return err;
 }
 
-static u32 next_idx(u32 idx, struct vio_dring_state *dr)
-{
-        if (++idx == dr->num_entries)
-                idx = 0;
-        return idx;
-}
-
-static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
-{
-        if (idx == 0)
-                idx = dr->num_entries - 1;
-        else
-                idx--;
-
-        return idx;
-}
-
 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
                                         struct vio_dring_state *dr,
                                         u32 index)
@@ -556,7 +539,8 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
         int ack_start = -1, ack_end = -1;
         bool send_ack = true;
 
-        end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
+        end = (end == (u32) -1) ? vio_dring_prev(dr, start)
+                                : vio_dring_next(dr, end);
 
         viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
 
@@ -570,7 +554,7 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
                 if (ack_start == -1)
                         ack_start = start;
                 ack_end = start;
-                start = next_idx(start, dr);
+                start = vio_dring_next(dr, start);
                 if (ack && start != end) {
                         err = vnet_send_ack(port, dr, ack_start, ack_end,
                                             VIO_DRING_ACTIVE);
@@ -584,7 +568,7 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
                 }
         }
         if (unlikely(ack_start == -1))
-                ack_start = ack_end = prev_idx(start, dr);
+                ack_start = ack_end = vio_dring_prev(dr, start);
         if (send_ack) {
                 port->napi_resume = false;
                 return vnet_send_ack(port, dr, ack_start, ack_end,
@@ -633,7 +617,7 @@ static int idx_is_pending(struct vio_dring_state *dr, u32 end)
                         found = 1;
                         break;
                 }
-                idx = next_idx(idx, dr);
+                idx = vio_dring_next(dr, idx);
         }
         return found;
 }
@@ -663,7 +647,7 @@ static int vnet_ack(struct vnet_port *port, void *msgbuf)
         /* sync for race conditions with vnet_start_xmit() and tell xmit it
          * is time to send a trigger.
          */
-        dr->cons = next_idx(end, dr);
+        dr->cons = vio_dring_next(dr, end);
         desc = vio_dring_entry(dr, dr->cons);
         if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
                 /* vnet_start_xmit() just populated this dring but missed
@@ -784,7 +768,7 @@ ldc_ctrl:
                         pkt->tag.stype = VIO_SUBTYPE_INFO;
                         pkt->tag.stype_env = VIO_DRING_DATA;
                         pkt->seq = dr->rcv_nxt;
-                        pkt->start_idx = next_idx(port->napi_stop_idx, dr);
+                        pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
                         pkt->end_idx = -1;
                         goto napi_resume;
                 }