net: mvneta: enable setting custom TX IP checksum limit
Since Armada 38x SoC can support IP checksum for jumbo frames only on
a single port, it means that this feature should be enabled per-port,
rather than for the whole SoC.
This patch enables setting custom TX IP checksum limit by adding new
optional property to the mvneta device tree node. If not used, by
default 1600B is set for "marvell,armada-370-neta" and 9800B for other
strings, which ensures backward compatibility. Binding documentation
is updated accordingly.
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 5a98c5d..ed622fa 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -243,6 +243,7 @@
#define MVNETA_VLAN_TAG_LEN 4
#define MVNETA_CPU_D_CACHE_LINE_SIZE 32
+#define MVNETA_TX_CSUM_DEF_SIZE 1600
#define MVNETA_TX_CSUM_MAX_SIZE 9800
#define MVNETA_ACC_MODE_EXT 1
@@ -3256,6 +3257,7 @@
char hw_mac_addr[ETH_ALEN];
const char *mac_from;
const char *managed;
+ int tx_csum_limit;
int phy_mode;
int err;
int cpu;
@@ -3356,8 +3358,21 @@
}
}
- if (of_device_is_compatible(dn, "marvell,armada-370-neta"))
- pp->tx_csum_limit = 1600;
+ if (!of_property_read_u32(dn, "tx-csum-limit", &tx_csum_limit)) {
+ if (tx_csum_limit < 0 ||
+ tx_csum_limit > MVNETA_TX_CSUM_MAX_SIZE) {
+ tx_csum_limit = MVNETA_TX_CSUM_DEF_SIZE;
+ dev_info(&pdev->dev,
+ "Wrong TX csum limit in DT, set to %dB\n",
+ MVNETA_TX_CSUM_DEF_SIZE);
+ }
+ } else if (of_device_is_compatible(dn, "marvell,armada-370-neta")) {
+ tx_csum_limit = MVNETA_TX_CSUM_DEF_SIZE;
+ } else {
+ tx_csum_limit = MVNETA_TX_CSUM_MAX_SIZE;
+ }
+
+ pp->tx_csum_limit = tx_csum_limit;
pp->tx_ring_size = MVNETA_MAX_TXD;
pp->rx_ring_size = MVNETA_MAX_RXD;