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authorAlexander Duyck <alexander.h.duyck@redhat.com>2015-04-08 18:49:49 -0700
committerDavid S. Miller <davem@davemloft.net>2015-04-09 14:25:26 -0400
commitc335869fb934ebcccab69315f1cbe7b34f6d9414 (patch)
tree111dcad834a71036ab1b7aca9d3f91a20197f8df
parent67317166dd6e8e78f20768e9f07fcc80846b207b (diff)
e100: Use dma_rmb/wmb where appropriate
Reduce the CPU overhead for transmit and receive by using lightweight dma_ barriers instead of full barriers where they are applicable. Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/intel/e100.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 05f88394f9a5..1a450f4b6b12 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -899,7 +899,7 @@ static int e100_exec_cb(struct nic *nic, struct sk_buff *skb,
/* Order is important otherwise we'll be in a race with h/w:
* set S-bit in current first, then clear S-bit in previous. */
cb->command |= cpu_to_le16(cb_s);
- wmb();
+ dma_wmb();
cb->prev->command &= cpu_to_le16(~cb_s);
while (nic->cb_to_send != nic->cb_to_use) {
@@ -1843,7 +1843,7 @@ static int e100_tx_clean(struct nic *nic)
for (cb = nic->cb_to_clean;
cb->status & cpu_to_le16(cb_complete);
cb = nic->cb_to_clean = cb->next) {
- rmb(); /* read skb after status */
+ dma_rmb(); /* read skb after status */
netif_printk(nic, tx_done, KERN_DEBUG, nic->netdev,
"cb[%d]->status = 0x%04X\n",
(int)(((void*)cb - (void*)nic->cbs)/sizeof(struct cb)),
@@ -1993,7 +1993,7 @@ static int e100_rx_indicate(struct nic *nic, struct rx *rx,
netif_printk(nic, rx_status, KERN_DEBUG, nic->netdev,
"status=0x%04X\n", rfd_status);
- rmb(); /* read size after status bit */
+ dma_rmb(); /* read size after status bit */
/* If data isn't ready, nothing to indicate */
if (unlikely(!(rfd_status & cb_complete))) {