In my patch series for splitting out the serial code from ioc3-eth
by using a MFD device there was one big patch for ioc3-eth.c,
which wasn't really usefull for reviews. This series contains the
ioc3-eth changes splitted in smaller steps and few more cleanups.
Only the conversion to MFD will be done later in a different series.
Thomas Bogendoerfer (15):
MIPS: SGI-IP27: remove ioc3 ethernet init
MIPS: SGI-IP27: restructure ioc3 register access
net: sgi: ioc3-eth: remove checkpatch errors/warning
net: sgi: ioc3-eth: use defines for constants dealing with desc rings
net: sgi: ioc3-eth: allocate space for desc rings only once
net: sgi: ioc3-eth: get rid of ioc3_clean_rx_ring()
net: sgi: ioc3-eth: separate tx and rx ring handling
net: sgi: ioc3-eth: introduce chip start function
net: sgi: ioc3-eth: split ring cleaning/freeing and allocation
net: sgi: ioc3-eth: refactor rx buffer allocation
net: sgi: ioc3-eth: use dma-direct for dma allocations
net: sgi: ioc3-eth: use csum_fold
net: sgi: ioc3-eth: Fix IPG settings
net: sgi: ioc3-eth: protect emcr in all cases
net: sgi: ioc3-eth: no need to stop queue set_multicast_list
arch/mips/include/asm/sn/ioc3.h | 357 +++++-------
arch/mips/sgi-ip27/ip27-console.c | 5 +-
arch/mips/sgi-ip27/ip27-init.c | 13 -
drivers/net/ethernet/sgi/ioc3-eth.c | 1038 ++++++++++++++++++-----------------
4 files changed, 666 insertions(+), 747 deletions(-)
--
2.13.7
Descriptor ring sizes of the IOC3 are more or less fixed size. To
make clearer where there is a relation to ring sizes use defines.
Reviewed-by: Jakub Kicinski <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>
---
drivers/net/ethernet/sgi/ioc3-eth.c | 42 +++++++++++++++++++++----------------
1 file changed, 24 insertions(+), 18 deletions(-)
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index e81e5bb37ac6..c875640926d6 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -61,10 +61,16 @@
#include <asm/sn/ioc3.h>
#include <asm/pci/bridge.h>
-/* 64 RX buffers. This is tunable in the range of 16 <= x < 512. The
- * value must be a power of two.
+/* Number of RX buffers. This is tunable in the range of 16 <= x < 512.
+ * The value must be a power of two.
*/
-#define RX_BUFFS 64
+#define RX_BUFFS 64
+#define RX_RING_ENTRIES 512 /* fixed in hardware */
+#define RX_RING_MASK (RX_RING_ENTRIES - 1)
+
+/* 128 TX buffers (not tunable) */
+#define TX_RING_ENTRIES 128
+#define TX_RING_MASK (TX_RING_ENTRIES - 1)
#define ETCSR_FD ((17 << ETCSR_IPGR2_SHIFT) | (11 << ETCSR_IPGR1_SHIFT) | 21)
#define ETCSR_HD ((21 << ETCSR_IPGR2_SHIFT) | (21 << ETCSR_IPGR1_SHIFT) | 21)
@@ -76,8 +82,8 @@ struct ioc3_private {
u32 *ssram;
unsigned long *rxr; /* pointer to receiver ring */
struct ioc3_etxd *txr;
- struct sk_buff *rx_skbs[512];
- struct sk_buff *tx_skbs[128];
+ struct sk_buff *rx_skbs[RX_RING_ENTRIES];
+ struct sk_buff *tx_skbs[TX_RING_ENTRIES];
int rx_ci; /* RX consumer index */
int rx_pi; /* RX producer index */
int tx_ci; /* TX consumer index */
@@ -573,10 +579,10 @@ static inline void ioc3_rx(struct net_device *dev)
ip->rx_skbs[n_entry] = new_skb;
rxr[n_entry] = cpu_to_be64(ioc3_map(rxb, 1));
rxb->w0 = 0; /* Clear valid flag */
- n_entry = (n_entry + 1) & 511; /* Update erpir */
+ n_entry = (n_entry + 1) & RX_RING_MASK; /* Update erpir */
/* Now go on to the next ring entry. */
- rx_entry = (rx_entry + 1) & 511;
+ rx_entry = (rx_entry + 1) & RX_RING_MASK;
skb = ip->rx_skbs[rx_entry];
rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
w0 = be32_to_cpu(rxb->w0);
@@ -598,7 +604,7 @@ static inline void ioc3_tx(struct net_device *dev)
spin_lock(&ip->ioc3_lock);
etcir = readl(®s->etcir);
- tx_entry = (etcir >> 7) & 127;
+ tx_entry = (etcir >> 7) & TX_RING_MASK;
o_entry = ip->tx_ci;
packets = 0;
bytes = 0;
@@ -610,17 +616,17 @@ static inline void ioc3_tx(struct net_device *dev)
dev_consume_skb_irq(skb);
ip->tx_skbs[o_entry] = NULL;
- o_entry = (o_entry + 1) & 127; /* Next */
+ o_entry = (o_entry + 1) & TX_RING_MASK; /* Next */
etcir = readl(®s->etcir); /* More pkts sent? */
- tx_entry = (etcir >> 7) & 127;
+ tx_entry = (etcir >> 7) & TX_RING_MASK;
}
dev->stats.tx_packets += packets;
dev->stats.tx_bytes += bytes;
ip->txqlen -= packets;
- if (ip->txqlen < 128)
+ if (netif_queue_stopped(dev) && ip->txqlen < TX_RING_ENTRIES)
netif_wake_queue(dev);
ip->tx_ci = o_entry;
@@ -765,10 +771,10 @@ static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
}
- ip->rx_pi &= 511;
- ip->rx_ci &= 511;
+ ip->rx_pi &= RX_RING_MASK;
+ ip->rx_ci &= RX_RING_MASK;
- for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & 511) {
+ for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & RX_RING_MASK) {
skb = ip->rx_skbs[i];
rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
rxb->w0 = 0;
@@ -780,7 +786,7 @@ static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
struct sk_buff *skb;
int i;
- for (i = 0; i < 128; i++) {
+ for (i = 0; i < TX_RING_ENTRIES; i++) {
skb = ip->tx_skbs[i];
if (skb) {
ip->tx_skbs[i] = NULL;
@@ -812,7 +818,7 @@ static void ioc3_free_rings(struct ioc3_private *ip)
if (skb)
dev_kfree_skb_any(skb);
- n_entry = (n_entry + 1) & 511;
+ n_entry = (n_entry + 1) & RX_RING_MASK;
}
free_page((unsigned long)ip->rxr);
ip->rxr = NULL;
@@ -1425,13 +1431,13 @@ static netdev_tx_t ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev)
mb(); /* make sure all descriptor changes are visible */
ip->tx_skbs[produce] = skb; /* Remember skb */
- produce = (produce + 1) & 127;
+ produce = (produce + 1) & TX_RING_MASK;
ip->tx_pi = produce;
writel(produce << 7, &ip->regs->etpir); /* Fire ... */
ip->txqlen++;
- if (ip->txqlen >= 127)
+ if (ip->txqlen >= (TX_RING_ENTRIES - 1))
netif_stop_queue(dev);
spin_unlock_irq(&ip->ioc3_lock);
--
2.13.7
Clean rx ring is just called once after a new ring is allocated, which
is per definition clean. So there is not need for this function.
Signed-off-by: Thomas Bogendoerfer <[email protected]>
---
drivers/net/ethernet/sgi/ioc3-eth.c | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 6ca560d4ab79..39631e067b71 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -761,26 +761,6 @@ static void ioc3_mii_start(struct ioc3_private *ip)
add_timer(&ip->ioc3_timer);
}
-static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
-{
- struct ioc3_erxbuf *rxb;
- struct sk_buff *skb;
- int i;
-
- for (i = ip->rx_ci; i & 15; i++) {
- ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
- ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
- }
- ip->rx_pi &= RX_RING_MASK;
- ip->rx_ci &= RX_RING_MASK;
-
- for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & RX_RING_MASK) {
- skb = ip->rx_skbs[i];
- rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
- rxb->w0 = 0;
- }
-}
-
static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
{
struct sk_buff *skb;
@@ -860,7 +840,6 @@ static void ioc3_init_rings(struct net_device *dev)
ioc3_free_rings(ip);
ioc3_alloc_rings(dev);
- ioc3_clean_rx_ring(ip);
ioc3_clean_tx_ring(ip);
/* Now the rx ring base, consume & produce registers. */
--
2.13.7
After allocation of descriptor memory is now done once in probe
handling of tx ring is completely done by ioc3_clean_tx_ring. So
we remove the remaining tx ring actions out of ioc3_alloc_rings
and ioc3_free_rings and rename it to ioc3_[alloc|free]_rx_bufs
to better describe what they are doing.
Signed-off-by: Thomas Bogendoerfer <[email protected]>
---
drivers/net/ethernet/sgi/ioc3-eth.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 39631e067b71..6c79be3098c3 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -778,13 +778,11 @@ static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
ip->tx_ci = 0;
}
-static void ioc3_free_rings(struct ioc3_private *ip)
+static void ioc3_free_rx_bufs(struct ioc3_private *ip)
{
struct sk_buff *skb;
int rx_entry, n_entry;
- ioc3_clean_tx_ring(ip);
-
n_entry = ip->rx_ci;
rx_entry = ip->rx_pi;
@@ -797,7 +795,7 @@ static void ioc3_free_rings(struct ioc3_private *ip)
}
}
-static void ioc3_alloc_rings(struct net_device *dev)
+static void ioc3_alloc_rx_bufs(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3_erxbuf *rxb;
@@ -826,9 +824,6 @@ static void ioc3_alloc_rings(struct net_device *dev)
}
ip->rx_ci = 0;
ip->rx_pi = RX_BUFFS;
-
- ip->tx_pi = 0;
- ip->tx_ci = 0;
}
static void ioc3_init_rings(struct net_device *dev)
@@ -837,8 +832,8 @@ static void ioc3_init_rings(struct net_device *dev)
struct ioc3_ethregs *regs = ip->regs;
unsigned long ring;
- ioc3_free_rings(ip);
- ioc3_alloc_rings(dev);
+ ioc3_free_rx_bufs(ip);
+ ioc3_alloc_rx_bufs(dev);
ioc3_clean_tx_ring(ip);
@@ -964,7 +959,9 @@ static int ioc3_close(struct net_device *dev)
ioc3_stop(ip);
free_irq(dev->irq, dev);
- ioc3_free_rings(ip);
+ ioc3_free_rx_bufs(ip);
+ ioc3_clean_tx_ring(ip);
+
return 0;
}
@@ -1265,7 +1262,7 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
out_stop:
ioc3_stop(ip);
del_timer_sync(&ip->ioc3_timer);
- ioc3_free_rings(ip);
+ ioc3_free_rx_bufs(ip);
kfree(ip->rxr);
kfree(ip->txr);
out_res:
--
2.13.7
On Wed, 28 Aug 2019 16:03:05 +0200, Thomas Bogendoerfer wrote:
> Clean rx ring is just called once after a new ring is allocated, which
> is per definition clean. So there is not need for this function.
>
> Signed-off-by: Thomas Bogendoerfer <[email protected]>
> ---
> drivers/net/ethernet/sgi/ioc3-eth.c | 21 ---------------------
> 1 file changed, 21 deletions(-)
>
> diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
> index 6ca560d4ab79..39631e067b71 100644
> --- a/drivers/net/ethernet/sgi/ioc3-eth.c
> +++ b/drivers/net/ethernet/sgi/ioc3-eth.c
> @@ -761,26 +761,6 @@ static void ioc3_mii_start(struct ioc3_private *ip)
> add_timer(&ip->ioc3_timer);
> }
>
> -static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
> -{
> - struct ioc3_erxbuf *rxb;
> - struct sk_buff *skb;
> - int i;
> -
> - for (i = ip->rx_ci; i & 15; i++) {
> - ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
> - ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
> - }
> - ip->rx_pi &= RX_RING_MASK;
> - ip->rx_ci &= RX_RING_MASK;
> -
> - for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & RX_RING_MASK) {
> - skb = ip->rx_skbs[i];
> - rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
> - rxb->w0 = 0;
There's gotta be some purpose to setting this w0 word to zero no?
ioc3_rx() uses that to see if the descriptor is done, and dutifully
clears it after..
> - }
> -}
> -
> static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
> {
> struct sk_buff *skb;
> @@ -860,7 +840,6 @@ static void ioc3_init_rings(struct net_device *dev)
> ioc3_free_rings(ip);
> ioc3_alloc_rings(dev);
>
> - ioc3_clean_rx_ring(ip);
> ioc3_clean_tx_ring(ip);
>
> /* Now the rx ring base, consume & produce registers. */
On Wed, 28 Aug 2019 16:02:46 -0700
Jakub Kicinski <[email protected]> wrote:
> On Wed, 28 Aug 2019 16:03:05 +0200, Thomas Bogendoerfer wrote:
> > Clean rx ring is just called once after a new ring is allocated, which
> > is per definition clean. So there is not need for this function.
> >
> > Signed-off-by: Thomas Bogendoerfer <[email protected]>
> > ---
> > drivers/net/ethernet/sgi/ioc3-eth.c | 21 ---------------------
> > 1 file changed, 21 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
> > index 6ca560d4ab79..39631e067b71 100644
> > --- a/drivers/net/ethernet/sgi/ioc3-eth.c
> > +++ b/drivers/net/ethernet/sgi/ioc3-eth.c
> > @@ -761,26 +761,6 @@ static void ioc3_mii_start(struct ioc3_private *ip)
> > add_timer(&ip->ioc3_timer);
> > }
> >
> > -static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
> > -{
> > - struct ioc3_erxbuf *rxb;
> > - struct sk_buff *skb;
> > - int i;
> > -
> > - for (i = ip->rx_ci; i & 15; i++) {
> > - ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
> > - ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
> > - }
> > - ip->rx_pi &= RX_RING_MASK;
> > - ip->rx_ci &= RX_RING_MASK;
> > -
> > - for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & RX_RING_MASK) {
> > - skb = ip->rx_skbs[i];
> > - rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
> > - rxb->w0 = 0;
>
> There's gotta be some purpose to setting this w0 word to zero no?
> ioc3_rx() uses that to see if the descriptor is done, and dutifully
> clears it after..
you are right. I thought this is already done in alloc_rx_bufs, but it isn't.
I'll add it there and put it into this patch. /me wonders why testing
didn't show this...
Thomas.
--
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