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authorLendacky, Thomas <Thomas.Lendacky@amd.com>2015-01-16 21:46:50 +0300
committerDavid S. Miller <davem@davemloft.net>2015-01-17 06:24:20 +0300
commit270894e7dc7afad8fb79592fe02aa05e604ddfc8 (patch)
treea78dafeccd2e57f9734088afea99145b61874c58 /drivers
parent916102c6664dcfc11f76ab1da27882aee1d01d8c (diff)
downloadlinux-270894e7dc7afad8fb79592fe02aa05e604ddfc8.tar.xz
amd-xgbe: Simplify the Rx desciptor ring tracking
Make the Rx descriptor ring processing similar to the Tx descriptor ring processing. Remove the realloc_index and realloc_threshold variables and base everything on the current index counter and the dirty index counter. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/amd/xgbe/xgbe-desc.c32
-rw-r--r--drivers/net/ethernet/amd/xgbe/xgbe-drv.c25
-rw-r--r--drivers/net/ethernet/amd/xgbe/xgbe.h11
3 files changed, 25 insertions, 43 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-desc.c b/drivers/net/ethernet/amd/xgbe/xgbe-desc.c
index a50891f52197..d81fc6bd4759 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-desc.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-desc.c
@@ -422,7 +422,6 @@ static void xgbe_wrapper_rx_descriptor_init(struct xgbe_prv_data *pdata)
ring->cur = 0;
ring->dirty = 0;
- memset(&ring->rx, 0, sizeof(ring->rx));
hw_if->rx_desc_init(channel);
}
@@ -621,35 +620,6 @@ err_out:
return 0;
}
-static void xgbe_realloc_rx_buffer(struct xgbe_channel *channel)
-{
- struct xgbe_prv_data *pdata = channel->pdata;
- struct xgbe_hw_if *hw_if = &pdata->hw_if;
- struct xgbe_ring *ring = channel->rx_ring;
- struct xgbe_ring_data *rdata;
- int i;
-
- DBGPR("-->xgbe_realloc_rx_buffer: rx_ring->rx.realloc_index = %u\n",
- ring->rx.realloc_index);
-
- for (i = 0; i < ring->dirty; i++) {
- rdata = XGBE_GET_DESC_DATA(ring, ring->rx.realloc_index);
-
- /* Reset rdata values */
- xgbe_unmap_rdata(pdata, rdata);
-
- if (xgbe_map_rx_buffer(pdata, ring, rdata))
- break;
-
- hw_if->rx_desc_reset(rdata);
-
- ring->rx.realloc_index++;
- }
- ring->dirty = 0;
-
- DBGPR("<--xgbe_realloc_rx_buffer\n");
-}
-
void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if)
{
DBGPR("-->xgbe_init_function_ptrs_desc\n");
@@ -657,7 +627,7 @@ void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if)
desc_if->alloc_ring_resources = xgbe_alloc_ring_resources;
desc_if->free_ring_resources = xgbe_free_ring_resources;
desc_if->map_tx_skb = xgbe_map_tx_skb;
- desc_if->realloc_rx_buffer = xgbe_realloc_rx_buffer;
+ desc_if->map_rx_buffer = xgbe_map_rx_buffer;
desc_if->unmap_rdata = xgbe_unmap_rdata;
desc_if->wrapper_tx_desc_init = xgbe_wrapper_tx_descriptor_init;
desc_if->wrapper_rx_desc_init = xgbe_wrapper_rx_descriptor_init;
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
index bdb373c87050..e2f560ff5104 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
@@ -225,6 +225,11 @@ static inline unsigned int xgbe_tx_avail_desc(struct xgbe_ring *ring)
return (ring->rdesc_count - (ring->cur - ring->dirty));
}
+static inline unsigned int xgbe_rx_dirty_desc(struct xgbe_ring *ring)
+{
+ return (ring->cur - ring->dirty);
+}
+
static int xgbe_maybe_stop_tx_queue(struct xgbe_channel *channel,
struct xgbe_ring *ring, unsigned int count)
{
@@ -1775,15 +1780,28 @@ struct net_device_ops *xgbe_get_netdev_ops(void)
static void xgbe_rx_refresh(struct xgbe_channel *channel)
{
struct xgbe_prv_data *pdata = channel->pdata;
+ struct xgbe_hw_if *hw_if = &pdata->hw_if;
struct xgbe_desc_if *desc_if = &pdata->desc_if;
struct xgbe_ring *ring = channel->rx_ring;
struct xgbe_ring_data *rdata;
- desc_if->realloc_rx_buffer(channel);
+ while (ring->dirty != ring->cur) {
+ rdata = XGBE_GET_DESC_DATA(ring, ring->dirty);
+
+ /* Reset rdata values */
+ desc_if->unmap_rdata(pdata, rdata);
+
+ if (desc_if->map_rx_buffer(pdata, ring, rdata))
+ break;
+
+ hw_if->rx_desc_reset(rdata);
+
+ ring->dirty++;
+ }
/* Update the Rx Tail Pointer Register with address of
* the last cleaned entry */
- rdata = XGBE_GET_DESC_DATA(ring, ring->rx.realloc_index - 1);
+ rdata = XGBE_GET_DESC_DATA(ring, ring->dirty - 1);
XGMAC_DMA_IOWRITE(channel, DMA_CH_RDTR_LO,
lower_32_bits(rdata->rdesc_dma));
}
@@ -1933,7 +1951,7 @@ static int xgbe_rx_poll(struct xgbe_channel *channel, int budget)
read_again:
rdata = XGBE_GET_DESC_DATA(ring, ring->cur);
- if (ring->dirty > (XGBE_RX_DESC_CNT >> 3))
+ if (xgbe_rx_dirty_desc(ring) > (XGBE_RX_DESC_CNT >> 3))
xgbe_rx_refresh(channel);
if (hw_if->dev_read(channel))
@@ -1941,7 +1959,6 @@ read_again:
received++;
ring->cur++;
- ring->dirty++;
incomplete = XGMAC_GET_BITS(packet->attributes,
RX_PACKET_ATTRIBUTES,
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
index 2af6affc35a7..e6ee64e1d6ec 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -361,8 +361,7 @@ struct xgbe_ring {
* cur - Tx: index of descriptor to be used for current transfer
* Rx: index of descriptor to check for packet availability
* dirty - Tx: index of descriptor to check for transfer complete
- * Rx: count of descriptors in which a packet has been received
- * (used with skb_realloc_index to refresh the ring)
+ * Rx: index of descriptor to check for buffer reallocation
*/
unsigned int cur;
unsigned int dirty;
@@ -377,11 +376,6 @@ struct xgbe_ring {
unsigned short cur_mss;
unsigned short cur_vlan_ctag;
} tx;
-
- struct {
- unsigned int realloc_index;
- unsigned int realloc_threshold;
- } rx;
};
} ____cacheline_aligned;
@@ -596,7 +590,8 @@ struct xgbe_desc_if {
int (*alloc_ring_resources)(struct xgbe_prv_data *);
void (*free_ring_resources)(struct xgbe_prv_data *);
int (*map_tx_skb)(struct xgbe_channel *, struct sk_buff *);
- void (*realloc_rx_buffer)(struct xgbe_channel *);
+ int (*map_rx_buffer)(struct xgbe_prv_data *, struct xgbe_ring *,
+ struct xgbe_ring_data *);
void (*unmap_rdata)(struct xgbe_prv_data *, struct xgbe_ring_data *);
void (*wrapper_tx_desc_init)(struct xgbe_prv_data *);
void (*wrapper_rx_desc_init)(struct xgbe_prv_data *);