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| author | Sriram <srk@ti.com> | 2010-07-29 02:33:59 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-30 23:55:37 -0700 |
| commit | 3725b1fe0b9c7e5ba3c4f6e585cd93a7174c1e07 (patch) | |
| tree | d294d986150fbd08adf5ee219b714d6123c525e6 | |
| parent | 84da2658a619c2d96fae6741580879cc6d7a4cd1 (diff) | |
| download | blackbird-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>
| -rw-r--r-- | drivers/net/davinci_emac.c | 21 |
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 |
