redonkable/alistair23-linux
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via-velocity: move residual free rx descriptors count register update

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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>
This commit is contained in:
Francois Romieu 2008-07-11 00:05:17 +02:00 committed by Jeff Garzik
parent 8ac53afccf
commit 2813317608
1 changed files with 14 additions and 14 deletions
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28
drivers/net/via-velocity.c
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@ -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,