amd-xgbe: Remove need for Tx path spinlock

Since the Tx ring cleanup can run at the same time that data is being
transmitted, a spin lock was used to protect the ring. This patch
eliminates the need for Tx spinlocks by updating the current ring
position only after all ownership bits for data being transmitted have
been set. This will insure that ring operations in the Tx cleanup path
do not interfere with the ring operations in the Tx transmit path.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas
2015-01-16 12:46:55 -06:00
committed by David S. Miller
parent 270894e7dc
commit a83ef427b7
2 changed files with 10 additions and 28 deletions

View File

@@ -1359,6 +1359,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
unsigned int tso_context, vlan_context;
unsigned int tx_set_ic;
int start_index = ring->cur;
int cur_index = ring->cur;
int i;
DBGPR("-->xgbe_dev_xmit\n");
@@ -1401,7 +1402,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
else
tx_set_ic = 0;
rdata = XGBE_GET_DESC_DATA(ring, ring->cur);
rdata = XGBE_GET_DESC_DATA(ring, cur_index);
rdesc = rdata->rdesc;
/* Create a context descriptor if this is a TSO packet */
@@ -1444,8 +1445,8 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
ring->tx.cur_vlan_ctag = packet->vlan_ctag;
}
ring->cur++;
rdata = XGBE_GET_DESC_DATA(ring, ring->cur);
cur_index++;
rdata = XGBE_GET_DESC_DATA(ring, cur_index);
rdesc = rdata->rdesc;
}
@@ -1473,7 +1474,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
XGMAC_SET_BITS_LE(rdesc->desc3, TX_NORMAL_DESC3, CTXT, 0);
/* Set OWN bit if not the first descriptor */
if (ring->cur != start_index)
if (cur_index != start_index)
XGMAC_SET_BITS_LE(rdesc->desc3, TX_NORMAL_DESC3, OWN, 1);
if (tso) {
@@ -1497,9 +1498,9 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
packet->length);
}
for (i = ring->cur - start_index + 1; i < packet->rdesc_count; i++) {
ring->cur++;
rdata = XGBE_GET_DESC_DATA(ring, ring->cur);
for (i = cur_index - start_index + 1; i < packet->rdesc_count; i++) {
cur_index++;
rdata = XGBE_GET_DESC_DATA(ring, cur_index);
rdesc = rdata->rdesc;
/* Update buffer address */
@@ -1551,7 +1552,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel)
/* Make sure ownership is written to the descriptor */
wmb();
ring->cur++;
ring->cur = cur_index + 1;
if (!packet->skb->xmit_more ||
netif_xmit_stopped(netdev_get_tx_queue(pdata->netdev,
channel->queue_index)))