}
}
+static int enetc_lso_count_descs(const struct sk_buff *skb)
+{
+ /* 4 BDs: 1 BD for LSO header + 1 BD for extended BD + 1 BD
+ * for linear area data but not include LSO header, namely
+ * skb_headlen(skb) - lso_hdr_len (it may be 0, but that's
+ * okay, we only need to consider the worst case). And 1 BD
+ * for gap.
+ */
+ return skb_shinfo(skb)->nr_frags + 4;
+}
+
+static int enetc_lso_get_hdr_len(const struct sk_buff *skb)
+{
+ int hdr_len, tlen;
+
+ tlen = skb_is_gso_tcp(skb) ? tcp_hdrlen(skb) : sizeof(struct udphdr);
+ hdr_len = skb_transport_offset(skb) + tlen;
+
+ return hdr_len;
+}
+
+static void enetc_lso_start(struct sk_buff *skb, struct enetc_lso_t *lso)
+{
+ lso->lso_seg_size = skb_shinfo(skb)->gso_size;
+ lso->ipv6 = enetc_skb_is_ipv6(skb);
+ lso->tcp = skb_is_gso_tcp(skb);
+ lso->l3_hdr_len = skb_network_header_len(skb);
+ lso->l3_start = skb_network_offset(skb);
+ lso->hdr_len = enetc_lso_get_hdr_len(skb);
+ lso->total_len = skb->len - lso->hdr_len;
+}
+
+static void enetc_lso_map_hdr(struct enetc_bdr *tx_ring, struct sk_buff *skb,
+ int *i, struct enetc_lso_t *lso)
+{
+ union enetc_tx_bd txbd_tmp, *txbd;
+ struct enetc_tx_swbd *tx_swbd;
+ u16 frm_len, frm_len_ext;
+ u8 flags, e_flags = 0;
+ dma_addr_t addr;
+ char *hdr;
+
+ /* Get the first BD of the LSO BDs chain */
+ txbd = ENETC_TXBD(*tx_ring, *i);
+ tx_swbd = &tx_ring->tx_swbd[*i];
+ prefetchw(txbd);
+
+ /* Prepare LSO header: MAC + IP + TCP/UDP */
+ hdr = tx_ring->tso_headers + *i * TSO_HEADER_SIZE;
+ memcpy(hdr, skb->data, lso->hdr_len);
+ addr = tx_ring->tso_headers_dma + *i * TSO_HEADER_SIZE;
+
+ /* {frm_len_ext, frm_len} indicates the total length of
+ * large transmit data unit. frm_len contains the 16 least
+ * significant bits and frm_len_ext contains the 4 most
+ * significant bits.
+ */
+ frm_len = lso->total_len & 0xffff;
+ frm_len_ext = (lso->total_len >> 16) & 0xf;
+
+ /* Set the flags of the first BD */
+ flags = ENETC_TXBD_FLAGS_EX | ENETC_TXBD_FLAGS_CSUM_LSO |
+ ENETC_TXBD_FLAGS_LSO | ENETC_TXBD_FLAGS_L4CS;
+
+ enetc_clear_tx_bd(&txbd_tmp);
+ txbd_tmp.addr = cpu_to_le64(addr);
+ txbd_tmp.hdr_len = cpu_to_le16(lso->hdr_len);
+
+ /* first BD needs frm_len and offload flags set */
+ txbd_tmp.frm_len = cpu_to_le16(frm_len);
+ txbd_tmp.flags = flags;
+
+ txbd_tmp.l3_aux0 = FIELD_PREP(ENETC_TX_BD_L3_START, lso->l3_start);
+ /* l3_hdr_size in 32-bits (4 bytes) */
+ txbd_tmp.l3_aux1 = FIELD_PREP(ENETC_TX_BD_L3_HDR_LEN,
+ lso->l3_hdr_len / 4);
+ if (lso->ipv6)
+ txbd_tmp.l3_aux1 |= ENETC_TX_BD_L3T;
+ else
+ txbd_tmp.l3_aux0 |= ENETC_TX_BD_IPCS;
+
+ txbd_tmp.l4_aux = FIELD_PREP(ENETC_TX_BD_L4T, lso->tcp ?
+ ENETC_TXBD_L4T_TCP : ENETC_TXBD_L4T_UDP);
+
+ /* For the LSO 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 = lso->hdr_len;
+ tx_swbd->do_twostep_tstamp = false;
+ tx_swbd->check_wb = false;
+
+ /* Actually write the header in the BD */
+ *txbd = txbd_tmp;
+
+ /* Get the next BD, and the next BD is extended BD */
+ enetc_bdr_idx_inc(tx_ring, i);
+ txbd = ENETC_TXBD(*tx_ring, *i);
+ tx_swbd = &tx_ring->tx_swbd[*i];
+ prefetchw(txbd);
+
+ enetc_clear_tx_bd(&txbd_tmp);
+ if (skb_vlan_tag_present(skb)) {
+ /* Setup the VLAN fields */
+ txbd_tmp.ext.vid = cpu_to_le16(skb_vlan_tag_get(skb));
+ txbd_tmp.ext.tpid = ENETC_TPID_8021Q;
+ e_flags = ENETC_TXBD_E_FLAGS_VLAN_INS;
+ }
+
+ /* Write the BD */
+ txbd_tmp.ext.e_flags = e_flags;
+ txbd_tmp.ext.lso_sg_size = cpu_to_le16(lso->lso_seg_size);
+ txbd_tmp.ext.frm_len_ext = cpu_to_le16(frm_len_ext);
+ *txbd = txbd_tmp;
+}
+
+static int enetc_lso_map_data(struct enetc_bdr *tx_ring, struct sk_buff *skb,
+ int *i, struct enetc_lso_t *lso, int *count)
+{
+ union enetc_tx_bd txbd_tmp, *txbd = NULL;
+ struct enetc_tx_swbd *tx_swbd;
+ skb_frag_t *frag;
+ dma_addr_t dma;
+ u8 flags = 0;
+ int len, f;
+
+ len = skb_headlen(skb) - lso->hdr_len;
+ if (len > 0) {
+ dma = dma_map_single(tx_ring->dev, skb->data + lso->hdr_len,
+ len, DMA_TO_DEVICE);
+ if (dma_mapping_error(tx_ring->dev, dma))
+ return -ENOMEM;
+
+ enetc_bdr_idx_inc(tx_ring, i);
+ txbd = ENETC_TXBD(*tx_ring, *i);
+ tx_swbd = &tx_ring->tx_swbd[*i];
+ prefetchw(txbd);
+ *count += 1;
+
+ enetc_clear_tx_bd(&txbd_tmp);
+ txbd_tmp.addr = cpu_to_le64(dma);
+ txbd_tmp.buf_len = cpu_to_le16(len);
+
+ tx_swbd->dma = dma;
+ tx_swbd->len = len;
+ tx_swbd->is_dma_page = 0;
+ tx_swbd->dir = DMA_TO_DEVICE;
+ }
+
+ frag = &skb_shinfo(skb)->frags[0];
+ for (f = 0; f < skb_shinfo(skb)->nr_frags; f++, frag++) {
+ if (txbd)
+ *txbd = txbd_tmp;
+
+ len = skb_frag_size(frag);
+ dma = skb_frag_dma_map(tx_ring->dev, frag);
+ if (dma_mapping_error(tx_ring->dev, dma))
+ return -ENOMEM;
+
+ /* 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);
+ *count += 1;
+
+ enetc_clear_tx_bd(&txbd_tmp);
+ txbd_tmp.addr = cpu_to_le64(dma);
+ txbd_tmp.buf_len = cpu_to_le16(len);
+
+ tx_swbd->dma = dma;
+ tx_swbd->len = len;
+ tx_swbd->is_dma_page = 1;
+ tx_swbd->dir = DMA_TO_DEVICE;
+ }
+
+ /* Last BD needs 'F' bit set */
+ flags |= ENETC_TXBD_FLAGS_F;
+ txbd_tmp.flags = flags;
+ *txbd = txbd_tmp;
+
+ tx_swbd->is_eof = 1;
+ tx_swbd->skb = skb;
+
+ return 0;
+}
+
+static int enetc_lso_hw_offload(struct enetc_bdr *tx_ring, struct sk_buff *skb)
+{
+ struct enetc_tx_swbd *tx_swbd;
+ struct enetc_lso_t lso = {0};
+ int err, i, count = 0;
+
+ /* Initialize the LSO handler */
+ enetc_lso_start(skb, &lso);
+ i = tx_ring->next_to_use;
+
+ enetc_lso_map_hdr(tx_ring, skb, &i, &lso);
+ /* First BD and an extend BD */
+ count += 2;
+
+ err = enetc_lso_map_data(tx_ring, skb, &i, &lso, &count);
+ if (err)
+ goto dma_err;
+
+ /* 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;
+
+dma_err:
+ 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 int enetc_map_tx_tso_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb)
{
struct enetc_ndev_priv *priv = netdev_priv(tx_ring->ndev);
tx_ring = priv->tx_ring[skb->queue_mapping];
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;
- }
+ /* LSO data unit lengths of up to 256KB are supported */
+ if (priv->active_offloads & ENETC_F_LSO &&
+ (skb->len - enetc_lso_get_hdr_len(skb)) <=
+ ENETC_LSO_MAX_DATA_LEN) {
+ if (enetc_bd_unused(tx_ring) < enetc_lso_count_descs(skb)) {
+ 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();
+ count = enetc_lso_hw_offload(tx_ring, skb);
+ } else {
+ if (enetc_bd_unused(tx_ring) < tso_count_descs(skb)) {
+ 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 > priv->max_frags))
if (unlikely(skb_linearize(skb)))
rss = enetc_rd(hw, ENETC_SIRSSCAPR);
si->num_rss = ENETC_SIRSSCAPR_GET_NUM_RSS(rss);
}
+
+ if (val & ENETC_SIPCAPR0_LSO)
+ si->hw_features |= ENETC_SI_F_LSO;
}
EXPORT_SYMBOL_GPL(enetc_get_si_caps);
return 0;
}
+static void enetc_set_lso_flags_mask(struct enetc_hw *hw)
+{
+ enetc_wr(hw, ENETC4_SILSOSFMR0,
+ SILSOSFMR0_VAL_SET(ENETC4_TCP_NL_SEG_FLAGS_DMASK,
+ ENETC4_TCP_NL_SEG_FLAGS_DMASK));
+ enetc_wr(hw, ENETC4_SILSOSFMR1, 0);
+}
+
int enetc_configure_si(struct enetc_ndev_priv *priv)
{
struct enetc_si *si = priv->si;
/* enable SI */
enetc_wr(hw, ENETC_SIMR, ENETC_SIMR_EN);
+ if (si->hw_features & ENETC_SI_F_LSO)
+ enetc_set_lso_flags_mask(hw);
+
/* TODO: RSS support for i.MX95 will be supported later, and the
* is_enetc_rev1() condition will be removed
*/
projects / thirdparty / kernel / linux.git / commitdiff
