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authorSriram <srk@ti.com>2010-07-29 02:33:59 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-30 23:55:37 -0700
commit3725b1fe0b9c7e5ba3c4f6e585cd93a7174c1e07 (patch)
treed294d986150fbd08adf5ee219b714d6123c525e6 /drivers/net/davinci_emac.c
parent84da2658a619c2d96fae6741580879cc6d7a4cd1 (diff)
downloadblackbird-op-linux-3725b1fe0b9c7e5ba3c4f6e585cd93a7174c1e07.tar.gz
blackbird-op-linux-3725b1fe0b9c7e5ba3c4f6e585cd93a7174c1e07.zip
TI DaVinci EMAC: Fix asymmetric handling of packets in NAPI Poll function.
The current implementation of NAPI poll function in the driver does not service Rx packets, error condition even if a single Tx packet gets serviced in the napi poll call. This behavior severely affects performance for specific use cases. This patch modifies the poll function implementation to service tx/rx packets in an identical manner. Signed-off-by: Sriramakrishnan <srk@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/davinci_emac.c')
-rw-r--r--drivers/net/davinci_emac.c21
1 files changed, 8 insertions, 13 deletions
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 28633761be21..2ebf1a1dd1e1 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -2266,7 +2266,7 @@ static int emac_poll(struct napi_struct *napi, int budget)
struct net_device *ndev = priv->ndev;
struct device *emac_dev = &ndev->dev;
u32 status = 0;
- u32 num_pkts = 0;
+ u32 num_tx_pkts = 0, num_rx_pkts = 0;
/* Check interrupt vectors and call packet processing */
status = emac_read(EMAC_MACINVECTOR);
@@ -2277,27 +2277,19 @@ static int emac_poll(struct napi_struct *napi, int budget)
mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;
if (status & mask) {
- num_pkts = emac_tx_bdproc(priv, EMAC_DEF_TX_CH,
+ num_tx_pkts = emac_tx_bdproc(priv, EMAC_DEF_TX_CH,
EMAC_DEF_TX_MAX_SERVICE);
} /* TX processing */
- if (num_pkts)
- return budget;
-
mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
if (priv->version == EMAC_VERSION_2)
mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;
if (status & mask) {
- num_pkts = emac_rx_bdproc(priv, EMAC_DEF_RX_CH, budget);
+ num_rx_pkts = emac_rx_bdproc(priv, EMAC_DEF_RX_CH, budget);
} /* RX processing */
- if (num_pkts < budget) {
- napi_complete(napi);
- emac_int_enable(priv);
- }
-
mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
if (priv->version == EMAC_VERSION_2)
mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT;
@@ -2328,9 +2320,12 @@ static int emac_poll(struct napi_struct *napi, int budget)
dev_err(emac_dev, "RX Host error %s on ch=%d\n",
&emac_rxhost_errcodes[cause][0], ch);
}
- } /* Host error processing */
+ } else if (num_rx_pkts < budget) {
+ napi_complete(napi);
+ emac_int_enable(priv);
+ }
- return num_pkts;
+ return num_rx_pkts;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
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