lkml.org 
[lkml]   [2023]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH net-next v5 2/2] net: stmmac: Tx coe sw fallback
Date
Add sw fallback of tx checksum calculation for those tx queues that
don't support tx checksum offloading. Because, some DWMAC IPs support
tx checksum offloading only for a few initial tx queues, starting
from tx queue 0.

Signed-off-by: Rohan G Thomas <rohan.g.thomas@intel.com>
---
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 18 ++++++++++++++++++
.../ethernet/stmicro/stmmac/stmmac_platform.c | 4 ++++
include/linux/stmmac.h | 1 +
3 files changed, 23 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 733b5e900817..3ffef45a2861 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4409,6 +4409,16 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
WARN_ON(tx_q->tx_skbuff[first_entry]);

csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
+ /* Some DWMAC IPs support tx coe only for a few initial tx queues,
+ * starting from tx queue 0. So checksum offloading for those queues
+ * that don't support tx coe needs to fallback to software checksum
+ * calculation.
+ */
+ if (csum_insertion && queue >= priv->plat->tx_queues_with_coe) {
+ if (unlikely(skb_checksum_help(skb)))
+ goto dma_map_err;
+ csum_insertion = !csum_insertion;
+ }

if (likely(priv->extend_desc))
desc = (struct dma_desc *)(tx_q->dma_etx + entry);
@@ -7401,6 +7411,14 @@ int stmmac_dvr_probe(struct device *device,
dev_info(priv->device, "SPH feature enabled\n");
}

+ if (priv->plat->tx_coe && !priv->plat->tx_queues_with_coe)
+ priv->plat->tx_queues_with_coe = priv->plat->tx_queues_to_use;
+ else if (!priv->plat->tx_coe)
+ priv->plat->tx_queues_with_coe = 0;
+ else if (priv->plat->tx_queues_with_coe < priv->plat->tx_queues_to_use)
+ dev_info(priv->device, "TX COE only available for %u queues\n",
+ priv->plat->tx_queues_with_coe);
+
/* Ideally our host DMA address width is the same as for the
* device. However, it may differ and then we have to use our
* host DMA width for allocation and the device DMA width for
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index be8e79c7aa34..0138b7c9c7ab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -225,6 +225,10 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
&plat->tx_queues_to_use))
plat->tx_queues_to_use = 1;

+ if (of_property_read_u32(tx_node, "snps,tx-queues-with-coe",
+ &plat->tx_queues_with_coe))
+ plat->tx_queues_with_coe = plat->tx_queues_to_use;
+
if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
else if (of_property_read_bool(tx_node, "snps,tx-sched-wfq"))
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 784277d666eb..cb508164eaea 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -252,6 +252,7 @@ struct plat_stmmacenet_data {
u32 host_dma_width;
u32 rx_queues_to_use;
u32 tx_queues_to_use;
+ u32 tx_queues_with_coe;
u8 rx_sched_algorithm;
u8 tx_sched_algorithm;
struct stmmac_rxq_cfg rx_queues_cfg[MTL_MAX_RX_QUEUES];
--
2.19.0
\
 
 \ /
  Last update: 2023-08-19 04:34    [W:0.383 / U:0.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site