via-velocity: move residual free rx descriptors count register update

Updates of the RBRDU have two different meanings depending on their
context:
1. the receiving process has not started - the value which is written
   into the RBRDU register is supposed to be the free rx descriptors
   count (rounded to a multiple of 4)
2. the receiving process is running - the value increments the count
   above (sic)

The update is currently issued deep inside the rx replenish chain (see
velocity_give_many_rx_descs).

Let's propagate enough information to the caller so that the rx
replenish functions do not depend on hardware any more.

It is needed to perform the Rx/Tx buffers housekeeping when MTU changes.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 86b256c..086d69c 100644 (file)
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -1155,7 +1155,7 @@ static void velocity_free_rings(struct velocity_info *vptr)
        pci_free_consistent(vptr->pdev, size, vptr->rd_ring, vptr->rd_pool_dma);
 }
 
-static inline void velocity_give_many_rx_descs(struct velocity_info *vptr)
+static void velocity_give_many_rx_descs(struct velocity_info *vptr)
 {
        struct mac_regs __iomem *regs = vptr->mac_regs;
        int avail, dirty, unusable;
@@ -1182,7 +1182,7 @@ static inline void velocity_give_many_rx_descs(struct velocity_info *vptr)
 
 static int velocity_rx_refill(struct velocity_info *vptr)
 {
-       int dirty = vptr->rd_dirty, done = 0, ret = 0;
+       int dirty = vptr->rd_dirty, done = 0;
 
        do {
                struct rx_desc *rd = vptr->rd_ring + dirty;
@@ -1192,8 +1192,7 @@ static int velocity_rx_refill(struct velocity_info *vptr)
                        break;
 
                if (!vptr->rd_info[dirty].skb) {
-                       ret = velocity_alloc_rx_buf(vptr, dirty);
-                       if (ret < 0)
+                       if (velocity_alloc_rx_buf(vptr, dirty) < 0)
                                break;
                }
                done++;
@@ -1203,10 +1202,9 @@ static int velocity_rx_refill(struct velocity_info *vptr)
        if (done) {
                vptr->rd_dirty = dirty;
                vptr->rd_filled += done;
-               velocity_give_many_rx_descs(vptr);
        }
 
-       return ret;
+       return done;
 }
 
 /**
@@ -1219,25 +1217,27 @@ static int velocity_rx_refill(struct velocity_info *vptr)
 
 static int velocity_init_rd_ring(struct velocity_info *vptr)
 {
-       int ret;
        int mtu = vptr->dev->mtu;
+       int ret = -ENOMEM;
 
        vptr->rx_buf_sz = (mtu <= ETH_DATA_LEN) ? PKT_BUF_SZ : mtu + 32;
 
        vptr->rd_info = kcalloc(vptr->options.numrx,
                                sizeof(struct velocity_rd_info), GFP_KERNEL);
        if (!vptr->rd_info)
-               return -ENOMEM;
+               goto out;
 
        vptr->rd_filled = vptr->rd_dirty = vptr->rd_curr = 0;
 
-       ret = velocity_rx_refill(vptr);
-       if (ret < 0) {
+       if (velocity_rx_refill(vptr) != vptr->options.numrx) {
                VELOCITY_PRT(MSG_LEVEL_ERR, KERN_ERR
                        "%s: failed to allocate RX buffer.\n", vptr->dev->name);
                velocity_free_rd_ring(vptr);
+               goto out;
        }
 
+       ret = 0;
+out:
        return ret;
 }
 
@@ -1412,10 +1412,8 @@ static int velocity_rx_srv(struct velocity_info *vptr, int status)
 
        vptr->rd_curr = rd_curr;
 
-       if (works > 0 && velocity_rx_refill(vptr) < 0) {
-               VELOCITY_PRT(MSG_LEVEL_ERR, KERN_ERR
-                       "%s: rx buf allocation failure\n", vptr->dev->name);
-       }
+       if ((works > 0) && (velocity_rx_refill(vptr) > 0))
+               velocity_give_many_rx_descs(vptr);
 
        VAR_USED(stats);
        return works;
@@ -1877,6 +1875,8 @@ static int velocity_open(struct net_device *dev)
        /* Ensure chip is running */
        pci_set_power_state(vptr->pdev, PCI_D0);
 
+       velocity_give_many_rx_descs(vptr);
+
        velocity_init_registers(vptr, VELOCITY_INIT_COLD);
 
        ret = request_irq(vptr->pdev->irq, &velocity_intr, IRQF_SHARED,