enetc: Remove Tx checksumming offload code

Tx checksumming has been defeatured and completely removed
from the h/w reference manual. Made a little cleanup for the
TSE case as this is complementary code.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Link: https://lore.kernel.org/r/20201103140213.3294-1-claudiu.manoil@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 52be6e3..01089c3 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -47,40 +47,6 @@ drop_packet_err:
        return NETDEV_TX_OK;
 }
 
-static bool enetc_tx_csum(struct sk_buff *skb, union enetc_tx_bd *txbd)
-{
-       int l3_start, l3_hsize;
-       u16 l3_flags, l4_flags;
-
-       if (skb->ip_summed != CHECKSUM_PARTIAL)
-               return false;
-
-       switch (skb->csum_offset) {
-       case offsetof(struct tcphdr, check):
-               l4_flags = ENETC_TXBD_L4_TCP;
-               break;
-       case offsetof(struct udphdr, check):
-               l4_flags = ENETC_TXBD_L4_UDP;
-               break;
-       default:
-               skb_checksum_help(skb);
-               return false;
-       }
-
-       l3_start = skb_network_offset(skb);
-       l3_hsize = skb_network_header_len(skb);
-
-       l3_flags = 0;
-       if (skb->protocol == htons(ETH_P_IPV6))
-               l3_flags = ENETC_TXBD_L3_IPV6;
-
-       /* write BD fields */
-       txbd->l3_csoff = enetc_txbd_l3_csoff(l3_start, l3_hsize, l3_flags);
-       txbd->l4_csoff = l4_flags;
-
-       return true;
-}
-
 static void enetc_unmap_tx_buff(struct enetc_bdr *tx_ring,
                                struct enetc_tx_swbd *tx_swbd)
 {
@@ -146,22 +112,16 @@ static int enetc_map_tx_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb,
        if (do_vlan || do_tstamp)
                flags |= ENETC_TXBD_FLAGS_EX;
 
-       if (enetc_tx_csum(skb, &temp_bd))
-               flags |= ENETC_TXBD_FLAGS_CSUM | ENETC_TXBD_FLAGS_L4CS;
-       else if (tx_ring->tsd_enable)
+       if (tx_ring->tsd_enable)
                flags |= ENETC_TXBD_FLAGS_TSE | ENETC_TXBD_FLAGS_TXSTART;
 
        /* first BD needs frm_len and offload flags set */
        temp_bd.frm_len = cpu_to_le16(skb->len);
        temp_bd.flags = flags;
 
-       if (flags & ENETC_TXBD_FLAGS_TSE) {
-               u32 temp;
-
-               temp = (skb->skb_mstamp_ns >> 5 & ENETC_TXBD_TXSTART_MASK)
-                       | (flags << ENETC_TXBD_FLAGS_OFFSET);
-               temp_bd.txstart = cpu_to_le32(temp);
-       }
+       if (flags & ENETC_TXBD_FLAGS_TSE)
+               temp_bd.txstart = enetc_txbd_set_tx_start(skb->skb_mstamp_ns,
+                                                         flags);
 
        if (flags & ENETC_TXBD_FLAGS_EX) {
                u8 e_flags = 0;
@@ -1897,8 +1857,7 @@ static void enetc_kfree_si(struct enetc_si *si)
 static void enetc_detect_errata(struct enetc_si *si)
 {
        if (si->pdev->revision == ENETC_REV1)
-               si->errata = ENETC_ERR_TXCSUM | ENETC_ERR_VLAN_ISOL |
-                            ENETC_ERR_UCMCSWP;
+               si->errata = ENETC_ERR_VLAN_ISOL | ENETC_ERR_UCMCSWP;
 }
 
 int enetc_pci_probe(struct pci_dev *pdev, const char *name, int sizeof_priv)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index dd0fb0c..8532d23 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -147,9 +147,8 @@ struct enetc_msg_swbd {
 
 #define ENETC_REV1     0x1
 enum enetc_errata {
-       ENETC_ERR_TXCSUM        = BIT(0),
-       ENETC_ERR_VLAN_ISOL     = BIT(1),
-       ENETC_ERR_UCMCSWP       = BIT(2),
+       ENETC_ERR_VLAN_ISOL     = BIT(0),
+       ENETC_ERR_UCMCSWP       = BIT(1),
 };
 
 #define ENETC_SI_F_QBV BIT(0)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 17cf7c9..68ef4f9 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -374,8 +374,7 @@ union enetc_tx_bd {
                __le16 frm_len;
                union {
                        struct {
-                               __le16 l3_csoff;
-                               u8 l4_csoff;
+                               u8 reserved[3];
                                u8 flags;
                        }; /* default layout */
                        __le32 txstart;
@@ -398,41 +397,37 @@ union enetc_tx_bd {
        } wb; /* writeback descriptor */
 };
 
-#define ENETC_TXBD_FLAGS_L4CS  BIT(0)
-#define ENETC_TXBD_FLAGS_TSE   BIT(1)
-#define ENETC_TXBD_FLAGS_W     BIT(2)
-#define ENETC_TXBD_FLAGS_CSUM  BIT(3)
-#define ENETC_TXBD_FLAGS_TXSTART BIT(4)
-#define ENETC_TXBD_FLAGS_EX    BIT(6)
-#define ENETC_TXBD_FLAGS_F     BIT(7)
+enum enetc_txbd_flags {
+       ENETC_TXBD_FLAGS_RES0 = BIT(0), /* reserved */
+       ENETC_TXBD_FLAGS_TSE = BIT(1),
+       ENETC_TXBD_FLAGS_W = BIT(2),
+       ENETC_TXBD_FLAGS_RES3 = BIT(3), /* reserved */
+       ENETC_TXBD_FLAGS_TXSTART = BIT(4),
+       ENETC_TXBD_FLAGS_EX = BIT(6),
+       ENETC_TXBD_FLAGS_F = BIT(7)
+};
 #define ENETC_TXBD_TXSTART_MASK GENMASK(24, 0)
 #define ENETC_TXBD_FLAGS_OFFSET 24
+
+static inline __le32 enetc_txbd_set_tx_start(u64 tx_start, u8 flags)
+{
+       u32 temp;
+
+       temp = (tx_start >> 5 & ENETC_TXBD_TXSTART_MASK) |
+              (flags << ENETC_TXBD_FLAGS_OFFSET);
+
+       return cpu_to_le32(temp);
+}
+
 static inline void enetc_clear_tx_bd(union enetc_tx_bd *txbd)
 {
        memset(txbd, 0, sizeof(*txbd));
 }
 
-/* L3 csum flags */
-#define ENETC_TXBD_L3_IPCS     BIT(7)
-#define ENETC_TXBD_L3_IPV6     BIT(15)
-
-#define ENETC_TXBD_L3_START_MASK       GENMASK(6, 0)
-#define ENETC_TXBD_L3_SET_HSIZE(val)   ((((val) >> 2) & 0x7f) << 8)
-
 /* Extension flags */
 #define ENETC_TXBD_E_FLAGS_VLAN_INS    BIT(0)
 #define ENETC_TXBD_E_FLAGS_TWO_STEP_PTP        BIT(2)
 
-static inline __le16 enetc_txbd_l3_csoff(int start, int hdr_sz, u16 l3_flags)
-{
-       return cpu_to_le16(l3_flags | ENETC_TXBD_L3_SET_HSIZE(hdr_sz) |
-                          (start & ENETC_TXBD_L3_START_MASK));
-}
-
-/* L4 csum flags */
-#define ENETC_TXBD_L4_UDP      BIT(5)
-#define ENETC_TXBD_L4_TCP      BIT(6)
-
 union enetc_rx_bd {
        struct {
                __le64 addr;

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index 4193063..ecdc2af 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -714,22 +714,16 @@ static void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
        ndev->watchdog_timeo = 5 * HZ;
        ndev->max_mtu = ENETC_MAX_MTU;
 
-       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
                            NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
                            NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK;
-       ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG |
-                        NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+       ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM |
                         NETIF_F_HW_VLAN_CTAG_TX |
                         NETIF_F_HW_VLAN_CTAG_RX;
 
        if (si->num_rss)
                ndev->hw_features |= NETIF_F_RXHASH;
 
-       if (si->errata & ENETC_ERR_TXCSUM) {
-               ndev->hw_features &= ~NETIF_F_HW_CSUM;
-               ndev->features &= ~NETIF_F_HW_CSUM;
-       }
-
        ndev->priv_flags |= IFF_UNICAST_FLT;
 
        if (si->hw_features & ENETC_SI_F_QBV)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_vf.c b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
index 7b5c82c..39c1a09 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc_vf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
@@ -120,22 +120,16 @@ static void enetc_vf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
        ndev->watchdog_timeo = 5 * HZ;
        ndev->max_mtu = ENETC_MAX_MTU;
 
-       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
                            NETIF_F_HW_VLAN_CTAG_TX |
                            NETIF_F_HW_VLAN_CTAG_RX;
-       ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG |
-                        NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+       ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM |
                         NETIF_F_HW_VLAN_CTAG_TX |
                         NETIF_F_HW_VLAN_CTAG_RX;
 
        if (si->num_rss)
                ndev->hw_features |= NETIF_F_RXHASH;
 
-       if (si->errata & ENETC_ERR_TXCSUM) {
-               ndev->hw_features &= ~NETIF_F_HW_CSUM;
-               ndev->features &= ~NETIF_F_HW_CSUM;
-       }
-
        /* pick up primary MAC address from SI */
        enetc_get_primary_mac_addr(&si->hw, ndev->dev_addr);
 }