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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>
This commit is contained in:
Sriram 2010-07-29 02:33:59 +00:00 committed by David S. Miller
parent 84da2658a6
commit 3725b1fe0b
1 changed files with 8 additions and 13 deletions
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21
drivers/net/davinci_emac.c
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@ -2266,7 +2266,7 @@ static int emac_poll(struct napi_struct *napi, int budget)
struct net_device *ndev = priv->ndev; struct net_device *ndev = priv->ndev;
struct device *emac_dev = &ndev->dev; struct device *emac_dev = &ndev->dev;
u32 status = 0; u32 status = 0;
u32 num_pkts = 0; u32 num_tx_pkts = 0, num_rx_pkts = 0;
/* Check interrupt vectors and call packet processing */ /* Check interrupt vectors and call packet processing */
status = emac_read(EMAC_MACINVECTOR); 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; mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;
if (status & mask) { 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); EMAC_DEF_TX_MAX_SERVICE);
} /* TX processing */ } /* TX processing */
if (num_pkts)
return budget;
mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC; mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
if (priv->version == EMAC_VERSION_2) if (priv->version == EMAC_VERSION_2)
mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC; mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;
if (status & mask) { 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 */ } /* RX processing */
if (num_pkts < budget) {
napi_complete(napi);
emac_int_enable(priv);
}
mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT; mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
if (priv->version == EMAC_VERSION_2) if (priv->version == EMAC_VERSION_2)
mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT; 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", dev_err(emac_dev, "RX Host error %s on ch=%d\n",
&emac_rxhost_errcodes[cause][0], ch); &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 #ifdef CONFIG_NET_POLL_CONTROLLER