[dpdk-dev] [PATCH v3 29/69] net/ice/base: always set prefena when configuring a Rx queue
Leyi Rong
leyi.rong at intel.com
Wed Jun 19 17:18:06 CEST 2019
Currently we are always setting prefena to 0. This is causing the
hardware to only fetch descriptors when there are none free in the cache
for a received packet instead of prefetching when it has used the last
descriptor regardless of incoming packets. Fix this by allowing the
hardware to prefetch Rx descriptors.
Signed-off-by: Brett Creeley <brett.creeley at intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr at intel.com>
Signed-off-by: Leyi Rong <leyi.rong at intel.com>
---
drivers/net/ice/base/ice_common.c | 9 ++++++++-
drivers/net/ice/base/ice_lan_tx_rx.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ice/base/ice_common.c b/drivers/net/ice/base/ice_common.c
index 7cd0832bc..5490c1dfd 100644
--- a/drivers/net/ice/base/ice_common.c
+++ b/drivers/net/ice/base/ice_common.c
@@ -1213,6 +1213,7 @@ static const struct ice_ctx_ele ice_rlan_ctx_info[] = {
ICE_CTX_STORE(ice_rlan_ctx, tphdata_ena, 1, 195),
ICE_CTX_STORE(ice_rlan_ctx, tphhead_ena, 1, 196),
ICE_CTX_STORE(ice_rlan_ctx, lrxqthresh, 3, 198),
+ ICE_CTX_STORE(ice_rlan_ctx, prefena, 1, 201),
{ 0 }
};
@@ -1223,7 +1224,8 @@ static const struct ice_ctx_ele ice_rlan_ctx_info[] = {
* @rxq_index: the index of the Rx queue
*
* Converts rxq context from sparse to dense structure and then writes
- * it to HW register space
+ * it to HW register space and enables the hardware to prefetch descriptors
+ * instead of only fetching them on demand
*/
enum ice_status
ice_write_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx,
@@ -1231,6 +1233,11 @@ ice_write_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx,
{
u8 ctx_buf[ICE_RXQ_CTX_SZ] = { 0 };
+ if (!rlan_ctx)
+ return ICE_ERR_BAD_PTR;
+
+ rlan_ctx->prefena = 1;
+
ice_set_ctx((u8 *)rlan_ctx, ctx_buf, ice_rlan_ctx_info);
return ice_copy_rxq_ctx_to_hw(hw, ctx_buf, rxq_index);
}
diff --git a/drivers/net/ice/base/ice_lan_tx_rx.h b/drivers/net/ice/base/ice_lan_tx_rx.h
index ef12b9f7c..fa2309bf1 100644
--- a/drivers/net/ice/base/ice_lan_tx_rx.h
+++ b/drivers/net/ice/base/ice_lan_tx_rx.h
@@ -807,6 +807,7 @@ struct ice_rlan_ctx {
u8 tphdata_ena;
u8 tphhead_ena;
u16 lrxqthresh; /* bigger than needed, see above for reason */
+ u8 prefena; /* NOTE: normally must be set to 1 at init */
};
struct ice_ctx_ele {
--
2.17.1
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