#include <linux/vmalloc.h>
#include <linux/ptp_classify.h>
#include <net/pkt_sched.h>
+#include <net/tso.h>
static int enetc_num_stack_tx_queues(struct enetc_ndev_priv *priv)
{
return 0;
}
+static void enetc_map_tx_tso_hdr(struct enetc_bdr *tx_ring, struct sk_buff *skb,
+ struct enetc_tx_swbd *tx_swbd,
+ union enetc_tx_bd *txbd, int *i, int hdr_len,
+ int data_len)
+{
+ union enetc_tx_bd txbd_tmp;
+ u8 flags = 0, e_flags = 0;
+ dma_addr_t addr;
+
+ enetc_clear_tx_bd(&txbd_tmp);
+ addr = tx_ring->tso_headers_dma + *i * TSO_HEADER_SIZE;
+
+ if (skb_vlan_tag_present(skb))
+ flags |= ENETC_TXBD_FLAGS_EX;
+
+ txbd_tmp.addr = cpu_to_le64(addr);
+ txbd_tmp.buf_len = cpu_to_le16(hdr_len);
+
+ /* first BD needs frm_len and offload flags set */
+ txbd_tmp.frm_len = cpu_to_le16(hdr_len + data_len);
+ txbd_tmp.flags = flags;
+
+ /* For the TSO header we do not set the dma address since we do not
+ * want it unmapped when we do cleanup. We still set len so that we
+ * count the bytes sent.
+ */
+ tx_swbd->len = hdr_len;
+ tx_swbd->do_twostep_tstamp = false;
+ tx_swbd->check_wb = false;
+
+ /* Actually write the header in the BD */
+ *txbd = txbd_tmp;
+
+ /* Add extension BD for VLAN */
+ if (flags & ENETC_TXBD_FLAGS_EX) {
+ /* Get the next BD */
+ enetc_bdr_idx_inc(tx_ring, i);
+ txbd = ENETC_TXBD(*tx_ring, *i);
+ tx_swbd = &tx_ring->tx_swbd[*i];
+ prefetchw(txbd);
+
+ /* Setup the VLAN fields */
+ enetc_clear_tx_bd(&txbd_tmp);
+ txbd_tmp.ext.vid = cpu_to_le16(skb_vlan_tag_get(skb));
+ txbd_tmp.ext.tpid = 0; /* < C-TAG */
+ e_flags |= ENETC_TXBD_E_FLAGS_VLAN_INS;
+
+ /* Write the BD */
+ txbd_tmp.ext.e_flags = e_flags;
+ *txbd = txbd_tmp;
+ }
+}
+
+static int enetc_map_tx_tso_data(struct enetc_bdr *tx_ring, struct sk_buff *skb,
+ struct enetc_tx_swbd *tx_swbd,
+ union enetc_tx_bd *txbd, char *data,
+ int size, bool last_bd)
+{
+ union enetc_tx_bd txbd_tmp;
+ dma_addr_t addr;
+ u8 flags = 0;
+
+ enetc_clear_tx_bd(&txbd_tmp);
+
+ addr = dma_map_single(tx_ring->dev, data, size, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(tx_ring->dev, addr))) {
+ netdev_err(tx_ring->ndev, "DMA map error\n");
+ return -ENOMEM;
+ }
+
+ if (last_bd) {
+ flags |= ENETC_TXBD_FLAGS_F;
+ tx_swbd->is_eof = 1;
+ }
+
+ txbd_tmp.addr = cpu_to_le64(addr);
+ txbd_tmp.buf_len = cpu_to_le16(size);
+ txbd_tmp.flags = flags;
+
+ tx_swbd->dma = addr;
+ tx_swbd->len = size;
+ tx_swbd->dir = DMA_TO_DEVICE;
+
+ *txbd = txbd_tmp;
+
+ return 0;
+}
+
+static __wsum enetc_tso_hdr_csum(struct tso_t *tso, struct sk_buff *skb,
+ char *hdr, int hdr_len, int *l4_hdr_len)
+{
+ char *l4_hdr = hdr + skb_transport_offset(skb);
+ int mac_hdr_len = skb_network_offset(skb);
+
+ if (tso->tlen != sizeof(struct udphdr)) {
+ struct tcphdr *tcph = (struct tcphdr *)(l4_hdr);
+
+ tcph->check = 0;
+ } else {
+ struct udphdr *udph = (struct udphdr *)(l4_hdr);
+
+ udph->check = 0;
+ }
+
+ /* Compute the IP checksum. This is necessary since tso_build_hdr()
+ * already incremented the IP ID field.
+ */
+ if (!tso->ipv6) {
+ struct iphdr *iph = (void *)(hdr + mac_hdr_len);
+
+ iph->check = 0;
+ iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
+ }
+
+ /* Compute the checksum over the L4 header. */
+ *l4_hdr_len = hdr_len - skb_transport_offset(skb);
+ return csum_partial(l4_hdr, *l4_hdr_len, 0);
+}
+
+static void enetc_tso_complete_csum(struct enetc_bdr *tx_ring, struct tso_t *tso,
+ struct sk_buff *skb, char *hdr, int len,
+ __wsum sum)
+{
+ char *l4_hdr = hdr + skb_transport_offset(skb);
+ __sum16 csum_final;
+
+ /* Complete the L4 checksum by appending the pseudo-header to the
+ * already computed checksum.
+ */
+ if (!tso->ipv6)
+ csum_final = csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ len, ip_hdr(skb)->protocol, sum);
+ else
+ csum_final = csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ len, ipv6_hdr(skb)->nexthdr, sum);
+
+ if (tso->tlen != sizeof(struct udphdr)) {
+ struct tcphdr *tcph = (struct tcphdr *)(l4_hdr);
+
+ tcph->check = csum_final;
+ } else {
+ struct udphdr *udph = (struct udphdr *)(l4_hdr);
+
+ udph->check = csum_final;
+ }
+}
+
+static int enetc_map_tx_tso_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb)
+{
+ int hdr_len, total_len, data_len;
+ struct enetc_tx_swbd *tx_swbd;
+ union enetc_tx_bd *txbd;
+ struct tso_t tso;
+ __wsum csum, csum2;
+ int count = 0, pos;
+ int err, i, bd_data_num;
+
+ /* Initialize the TSO handler, and prepare the first payload */
+ hdr_len = tso_start(skb, &tso);
+ total_len = skb->len - hdr_len;
+ i = tx_ring->next_to_use;
+
+ while (total_len > 0) {
+ char *hdr;
+
+ /* Get the BD */
+ txbd = ENETC_TXBD(*tx_ring, i);
+ tx_swbd = &tx_ring->tx_swbd[i];
+ prefetchw(txbd);
+
+ /* Determine the length of this packet */
+ data_len = min_t(int, skb_shinfo(skb)->gso_size, total_len);
+ total_len -= data_len;
+
+ /* prepare packet headers: MAC + IP + TCP */
+ hdr = tx_ring->tso_headers + i * TSO_HEADER_SIZE;
+ tso_build_hdr(skb, hdr, &tso, data_len, total_len == 0);
+
+ /* compute the csum over the L4 header */
+ csum = enetc_tso_hdr_csum(&tso, skb, hdr, hdr_len, &pos);
+ enetc_map_tx_tso_hdr(tx_ring, skb, tx_swbd, txbd, &i, hdr_len, data_len);
+ bd_data_num = 0;
+ count++;
+
+ while (data_len > 0) {
+ int size;
+
+ size = min_t(int, tso.size, data_len);
+
+ /* Advance the index in the BDR */
+ enetc_bdr_idx_inc(tx_ring, &i);
+ txbd = ENETC_TXBD(*tx_ring, i);
+ tx_swbd = &tx_ring->tx_swbd[i];
+ prefetchw(txbd);
+
+ /* Compute the checksum over this segment of data and
+ * add it to the csum already computed (over the L4
+ * header and possible other data segments).
+ */
+ csum2 = csum_partial(tso.data, size, 0);
+ csum = csum_block_add(csum, csum2, pos);
+ pos += size;
+
+ err = enetc_map_tx_tso_data(tx_ring, skb, tx_swbd, txbd,
+ tso.data, size,
+ size == data_len);
+ if (err)
+ goto err_map_data;
+
+ data_len -= size;
+ count++;
+ bd_data_num++;
+ tso_build_data(skb, &tso, size);
+
+ if (unlikely(bd_data_num >= ENETC_MAX_SKB_FRAGS && data_len))
+ goto err_chained_bd;
+ }
+
+ enetc_tso_complete_csum(tx_ring, &tso, skb, hdr, pos, csum);
+
+ if (total_len == 0)
+ tx_swbd->skb = skb;
+
+ /* Go to the next BD */
+ enetc_bdr_idx_inc(tx_ring, &i);
+ }
+
+ tx_ring->next_to_use = i;
+ enetc_update_tx_ring_tail(tx_ring);
+
+ return count;
+
+err_map_data:
+ dev_err(tx_ring->dev, "DMA map error");
+
+err_chained_bd:
+ do {
+ tx_swbd = &tx_ring->tx_swbd[i];
+ enetc_free_tx_frame(tx_ring, tx_swbd);
+ if (i == 0)
+ i = tx_ring->bd_count;
+ i--;
+ } while (count--);
+
+ return 0;
+}
+
static netdev_tx_t enetc_start_xmit(struct sk_buff *skb,
struct net_device *ndev)
{
tx_ring = priv->tx_ring[skb->queue_mapping];
- if (unlikely(skb_shinfo(skb)->nr_frags > ENETC_MAX_SKB_FRAGS))
- if (unlikely(skb_linearize(skb)))
- goto drop_packet_err;
+ if (skb_is_gso(skb)) {
+ if (enetc_bd_unused(tx_ring) < tso_count_descs(skb)) {
+ netif_stop_subqueue(ndev, tx_ring->index);
+ return NETDEV_TX_BUSY;
+ }
- count = skb_shinfo(skb)->nr_frags + 1; /* fragments + head */
- if (enetc_bd_unused(tx_ring) < ENETC_TXBDS_NEEDED(count)) {
- netif_stop_subqueue(ndev, tx_ring->index);
- return NETDEV_TX_BUSY;
- }
+ enetc_lock_mdio();
+ count = enetc_map_tx_tso_buffs(tx_ring, skb);
+ enetc_unlock_mdio();
+ } else {
+ if (unlikely(skb_shinfo(skb)->nr_frags > ENETC_MAX_SKB_FRAGS))
+ if (unlikely(skb_linearize(skb)))
+ goto drop_packet_err;
+
+ count = skb_shinfo(skb)->nr_frags + 1; /* fragments + head */
+ if (enetc_bd_unused(tx_ring) < ENETC_TXBDS_NEEDED(count)) {
+ netif_stop_subqueue(ndev, tx_ring->index);
+ return NETDEV_TX_BUSY;
+ }
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
- err = skb_checksum_help(skb);
- if (err)
- goto drop_packet_err;
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ err = skb_checksum_help(skb);
+ if (err)
+ goto drop_packet_err;
+ }
+ enetc_lock_mdio();
+ count = enetc_map_tx_buffs(tx_ring, skb);
+ enetc_unlock_mdio();
}
- enetc_lock_mdio();
- count = enetc_map_tx_buffs(tx_ring, skb);
- enetc_unlock_mdio();
-
if (unlikely(!count))
goto drop_packet_err;
return -ENOMEM;
err = enetc_dma_alloc_bdr(txr, sizeof(union enetc_tx_bd));
- if (err) {
- vfree(txr->tx_swbd);
- return err;
- }
+ if (err)
+ goto err_alloc_bdr;
+
+ txr->tso_headers = dma_alloc_coherent(txr->dev,
+ txr->bd_count * TSO_HEADER_SIZE,
+ &txr->tso_headers_dma,
+ GFP_KERNEL);
+ if (err)
+ goto err_alloc_tso;
txr->next_to_clean = 0;
txr->next_to_use = 0;
return 0;
+
+err_alloc_tso:
+ dma_free_coherent(txr->dev, txr->bd_count * sizeof(union enetc_tx_bd),
+ txr->bd_base, txr->bd_dma_base);
+ txr->bd_base = NULL;
+err_alloc_bdr:
+ vfree(txr->tx_swbd);
+ txr->tx_swbd = NULL;
+
+ return err;
}
static void enetc_free_txbdr(struct enetc_bdr *txr)
size = txr->bd_count * sizeof(union enetc_tx_bd);
+ dma_free_coherent(txr->dev, txr->bd_count * TSO_HEADER_SIZE,
+ txr->tso_headers, txr->tso_headers_dma);
+ txr->tso_headers = NULL;
+
dma_free_coherent(txr->dev, size, txr->bd_base, txr->bd_dma_base);
txr->bd_base = NULL;
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