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Subject[PATCH RFC 05/10] dpaa_eth: add driver's Tx queue selection mechanism
Date
Allow the selection of the transmission queue based on the CPU id.

Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
---
drivers/net/ethernet/freescale/dpaa/Kconfig | 11 +++++++++++
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 3 +++
drivers/net/ethernet/freescale/dpaa/dpaa_eth.h | 6 ++++++
drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c | 9 +++++++++
drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h | 4 ++++
5 files changed, 33 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa/Kconfig b/drivers/net/ethernet/freescale/dpaa/Kconfig
index 9db7d25..a124639 100644
--- a/drivers/net/ethernet/freescale/dpaa/Kconfig
+++ b/drivers/net/ethernet/freescale/dpaa/Kconfig
@@ -11,6 +11,17 @@ menuconfig FSL_DPAA_ETH

if FSL_DPAA_ETH

+config FSL_DPAA_ETH_USE_NDO_SELECT_QUEUE
+ bool "Use driver's Tx queue selection mechanism"
+ default y
+ depends on FSL_DPAA_ETH
+ ---help---
+ The DPAA-Ethernet driver defines a ndo_select_queue() callback for optimal selection
+ of the egress FQ. That will override the XPS support for this netdevice.
+ If for whatever reason you want to be in control of the egress FQ-to-CPU selection and mapping,
+ or simply don't want to use the driver's ndo_select_queue() callback, then unselect this
+ and use the standard XPS support instead.
+
config FSL_DPAA_ETH_MAX_BUF_COUNT
int "Maximum nuber of buffers in private bpool"
depends on FSL_DPAA_ETH
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 036e272..6ca637d 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -388,6 +388,9 @@ static const struct net_device_ops dpa_private_ops = {
.ndo_get_stats64 = dpa_get_stats64,
.ndo_set_mac_address = dpa_set_mac_address,
.ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_FSL_DPAA_ETH_USE_NDO_SELECT_QUEUE
+ .ndo_select_queue = dpa_select_queue,
+#endif
.ndo_change_mtu = dpa_change_mtu,
.ndo_set_rx_mode = dpa_set_rx_mode,
.ndo_init = dpa_ndo_init,
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
index 5f3157d..da2fd6b 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
@@ -431,9 +431,15 @@ static inline void _dpa_assign_wq(struct dpa_fq *fq)
}
}

+#ifdef CONFIG_FSL_DPAA_ETH_USE_NDO_SELECT_QUEUE
+/* Use in lieu of skb_get_queue_mapping() */
+#define dpa_get_queue_mapping(skb) \
+ smp_processor_id()
+#else
/* Use the queue selected by XPS */
#define dpa_get_queue_mapping(skb) \
skb_get_queue_mapping(skb)
+#endif

static inline void _dpa_bp_free_pf(void *addr)
{
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
index 1fdb35d..eb7a4a0 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
@@ -615,6 +615,15 @@ bool dpa_bpid2pool_use(int bpid)
return false;
}

+#ifdef CONFIG_FSL_DPAA_ETH_USE_NDO_SELECT_QUEUE
+u16 dpa_select_queue(struct net_device *net_dev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback)
+{
+ return dpa_get_queue_mapping(skb);
+}
+EXPORT_SYMBOL(dpa_select_queue);
+#endif
+
struct dpa_fq *dpa_fq_alloc(struct device *dev,
const struct fqid_cell *fqids,
struct list_head *list,
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
index 9b1774e..de5b68e 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
@@ -89,6 +89,10 @@ struct dpa_bp *dpa_bpid2pool(int bpid);
void dpa_bpid2pool_map(int bpid, struct dpa_bp *dpa_bp);
bool dpa_bpid2pool_use(int bpid);
void dpa_bp_drain(struct dpa_bp *bp);
+#ifdef CONFIG_FSL_DPAA_ETH_USE_NDO_SELECT_QUEUE
+u16 dpa_select_queue(struct net_device *net_dev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback);
+#endif
struct dpa_fq *dpa_fq_alloc(struct device *dev,
const struct fqid_cell *fqids,
struct list_head *list,
--
1.7.11.7


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