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net: netcp: use hw capability to remove FCS word from rx packets 

Some of the newer Ethernet switch hw (such as that on k2e/l/g) can
strip the Etherenet FCS from packet at the port 0 egress of the switch.
So use this capability instead of doing it in software.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4.11.x+fslc
Karicheri, Muralidharan 2017-01-06 15:37:43 -05:00 committed by David S. Miller
parent 0cead3a6a1
commit 4cd85a61d2
3 changed files with 16 additions and 4 deletions
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2
drivers/net/ethernet/ti/netcp.h
View File

@ -102,6 +102,8 @@ struct netcp_intf {
void *rx_fdq[KNAV_DMA_FDQ_PER_CHAN];
struct napi_struct rx_napi;
struct napi_struct tx_napi;
#define ETH_SW_CAN_REMOVE_ETH_FCS BIT(0)
u32 hw_cap;
/* 64-bit netcp stats */
struct netcp_stats stats;

8
drivers/net/ethernet/ti/netcp_core.c
View File

@ -739,8 +739,12 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
pkt_sz, accum_sz);
/* Remove ethernet FCS from the packet */
__pskb_trim(skb, skb->len - ETH_FCS_LEN);
/* Newer version of the Ethernet switch can trim the Ethernet FCS
* from the packet and is indicated in hw_cap. So trim it only for
* older h/w
*/
if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
__pskb_trim(skb, skb->len - ETH_FCS_LEN);
/* Call each of the RX hooks */
p_info.skb = skb;

10
drivers/net/ethernet/ti/netcp_ethss.c
View File

@ -122,6 +122,7 @@
#define MACSL_FULLDUPLEX BIT(0)
#define GBE_CTL_P0_ENABLE BIT(2)
#define ETH_SW_CTL_P0_TX_CRC_REMOVE BIT(13)
#define GBE13_REG_VAL_STAT_ENABLE_ALL 0xff
#define XGBE_REG_VAL_STAT_ENABLE_ALL 0xf
#define GBE_STATS_CD_SEL BIT(28)
@ -2821,7 +2822,7 @@ static int gbe_open(void *intf_priv, struct net_device *ndev)
struct netcp_intf *netcp = netdev_priv(ndev);
struct gbe_slave *slave = gbe_intf->slave;
int port_num = slave->port_num;
u32 reg;
u32 reg, val;
int ret;
reg = readl(GBE_REG_ADDR(gbe_dev, switch_regs, id_ver));
@ -2851,7 +2852,12 @@ static int gbe_open(void *intf_priv, struct net_device *ndev)
writel(0, GBE_REG_ADDR(gbe_dev, switch_regs, ptype));
/* Control register */
writel(GBE_CTL_P0_ENABLE, GBE_REG_ADDR(gbe_dev, switch_regs, control));
val = GBE_CTL_P0_ENABLE;
if (IS_SS_ID_MU(gbe_dev)) {
val |= ETH_SW_CTL_P0_TX_CRC_REMOVE;
netcp->hw_cap = ETH_SW_CAN_REMOVE_ETH_FCS;
}
writel(val, GBE_REG_ADDR(gbe_dev, switch_regs, control));
/* All statistics enabled and STAT AB visible by default */
writel(gbe_dev->stats_en_mask, GBE_REG_ADDR(gbe_dev, switch_regs,