diff options
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/ring_mode.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c new file mode 100644 index 000000000..2b5b17d8b --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-only +/******************************************************************************* + Specialised functions for managing Ring mode + + Copyright(C) 2011 STMicroelectronics Ltd + + It defines all the functions used to handle the normal/enhanced + descriptors in case of the DMA is configured to work in chained or + in ring mode. + + + Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> +*******************************************************************************/ + +#include "stmmac.h" + +static int jumbo_frm(void *p, struct sk_buff *skb, int csum) +{ + struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)p; + unsigned int nopaged_len = skb_headlen(skb); + struct stmmac_priv *priv = tx_q->priv_data; + unsigned int entry = tx_q->cur_tx; + unsigned int bmax, len, des2; + struct dma_desc *desc; + + if (priv->extend_desc) + desc = (struct dma_desc *)(tx_q->dma_etx + entry); + else + desc = tx_q->dma_tx + entry; + + if (priv->plat->enh_desc) + bmax = BUF_SIZE_8KiB; + else + bmax = BUF_SIZE_2KiB; + + len = nopaged_len - bmax; + + if (nopaged_len > BUF_SIZE_8KiB) { + + des2 = dma_map_single(priv->device, skb->data, bmax, + DMA_TO_DEVICE); + desc->des2 = cpu_to_le32(des2); + if (dma_mapping_error(priv->device, des2)) + return -1; + + tx_q->tx_skbuff_dma[entry].buf = des2; + tx_q->tx_skbuff_dma[entry].len = bmax; + tx_q->tx_skbuff_dma[entry].is_jumbo = true; + + desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); + stmmac_prepare_tx_desc(priv, desc, 1, bmax, csum, + STMMAC_RING_MODE, 0, false, skb->len); + tx_q->tx_skbuff[entry] = NULL; + entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size); + + if (priv->extend_desc) + desc = (struct dma_desc *)(tx_q->dma_etx + entry); + else + desc = tx_q->dma_tx + entry; + + des2 = dma_map_single(priv->device, skb->data + bmax, len, + DMA_TO_DEVICE); + desc->des2 = cpu_to_le32(des2); + if (dma_mapping_error(priv->device, des2)) + return -1; + tx_q->tx_skbuff_dma[entry].buf = des2; + tx_q->tx_skbuff_dma[entry].len = len; + tx_q->tx_skbuff_dma[entry].is_jumbo = true; + + desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); + stmmac_prepare_tx_desc(priv, desc, 0, len, csum, + STMMAC_RING_MODE, 1, !skb_is_nonlinear(skb), + skb->len); + } else { + des2 = dma_map_single(priv->device, skb->data, + nopaged_len, DMA_TO_DEVICE); + desc->des2 = cpu_to_le32(des2); + if (dma_mapping_error(priv->device, des2)) + return -1; + tx_q->tx_skbuff_dma[entry].buf = des2; + tx_q->tx_skbuff_dma[entry].len = nopaged_len; + tx_q->tx_skbuff_dma[entry].is_jumbo = true; + desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); + stmmac_prepare_tx_desc(priv, desc, 1, nopaged_len, csum, + STMMAC_RING_MODE, 0, !skb_is_nonlinear(skb), + skb->len); + } + + tx_q->cur_tx = entry; + + return entry; +} + +static unsigned int is_jumbo_frm(int len, int enh_desc) +{ + unsigned int ret = 0; + + if (len >= BUF_SIZE_4KiB) + ret = 1; + + return ret; +} + +static void refill_desc3(void *priv_ptr, struct dma_desc *p) +{ + struct stmmac_rx_queue *rx_q = priv_ptr; + struct stmmac_priv *priv = rx_q->priv_data; + + /* Fill DES3 in case of RING mode */ + if (priv->dma_conf.dma_buf_sz == BUF_SIZE_16KiB) + p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); +} + +/* In ring mode we need to fill the desc3 because it is used as buffer */ +static void init_desc3(struct dma_desc *p) +{ + p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); +} + +static void clean_desc3(void *priv_ptr, struct dma_desc *p) +{ + struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)priv_ptr; + struct stmmac_priv *priv = tx_q->priv_data; + unsigned int entry = tx_q->dirty_tx; + + /* des3 is only used for jumbo frames tx or time stamping */ + if (unlikely(tx_q->tx_skbuff_dma[entry].is_jumbo || + (tx_q->tx_skbuff_dma[entry].last_segment && + !priv->extend_desc && priv->hwts_tx_en))) + p->des3 = 0; +} + +static int set_16kib_bfsize(int mtu) +{ + int ret = 0; + if (unlikely(mtu > BUF_SIZE_8KiB)) + ret = BUF_SIZE_16KiB; + return ret; +} + +const struct stmmac_mode_ops ring_mode_ops = { + .is_jumbo_frm = is_jumbo_frm, + .jumbo_frm = jumbo_frm, + .refill_desc3 = refill_desc3, + .init_desc3 = init_desc3, + .clean_desc3 = clean_desc3, + .set_16kib_bfsize = set_16kib_bfsize, +}; |