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Release 4.11 drivers/net/ethernet/stmicro/stmmac/ring_mode.c

/*******************************************************************************
  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.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include "stmmac.h"


static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) { struct stmmac_priv *priv = (struct stmmac_priv *)p; unsigned int entry = priv->cur_tx; struct dma_desc *desc; unsigned int nopaged_len = skb_headlen(skb); unsigned int bmax, len, des2; if (priv->extend_desc) desc = (struct dma_desc *)(priv->dma_etx + entry); else desc = priv->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; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = bmax; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_RING_MODE, 0, false); priv->tx_skbuff[entry] = NULL; entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE); if (priv->extend_desc) desc = (struct dma_desc *)(priv->dma_etx + entry); else desc = priv->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; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = len; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 0, len, csum, STMMAC_RING_MODE, 1, true); } 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; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = nopaged_len; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum, STMMAC_RING_MODE, 0, true); } priv->cur_tx = entry; return entry; }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro38175.15%763.64%
Byungho An5210.26%19.09%
Michael Weiser387.50%19.09%
Rayagond Kokatanur275.33%19.09%
damuzi00091.78%19.09%
Total507100.00%11100.00%


static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc) { unsigned int ret = 0; if (len >= BUF_SIZE_4KiB) ret = 1; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro32100.00%1100.00%
Total32100.00%1100.00%


static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; /* Fill DES3 in case of RING mode */ if (priv->dma_buf_sz >= BUF_SIZE_8KiB) p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro2853.85%133.33%
Rayagond Kokatanur1834.62%133.33%
Michael Weiser611.54%133.33%
Total52100.00%3100.00%

/* In ring mode we need to fill the desc3 because it is used as buffer */
static void stmmac_init_desc3(struct dma_desc *p) { p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro2177.78%150.00%
Michael Weiser622.22%150.00%
Total27100.00%2100.00%


static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; unsigned int entry = priv->dirty_tx; /* des3 is only used for jumbo frames tx or time stamping */ if (unlikely(priv->tx_skbuff_dma[entry].is_jumbo || (priv->tx_skbuff_dma[entry].last_segment && !priv->extend_desc && priv->hwts_tx_en))) p->des3 = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro7294.74%266.67%
Rayagond Kokatanur45.26%133.33%
Total76100.00%3100.00%


static int stmmac_set_16kib_bfsize(int mtu) { int ret = 0; if (unlikely(mtu >= BUF_SIZE_8KiB)) ret = BUF_SIZE_16KiB; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro30100.00%1100.00%
Total30100.00%1100.00%

const struct stmmac_mode_ops ring_mode_ops = { .is_jumbo_frm = stmmac_is_jumbo_frm, .jumbo_frm = stmmac_jumbo_frm, .refill_desc3 = stmmac_refill_desc3, .init_desc3 = stmmac_init_desc3, .clean_desc3 = stmmac_clean_desc3, .set_16kib_bfsize = stmmac_set_16kib_bfsize, };

Overall Contributors

PersonTokensPropCommitsCommitProp
Giuseppe Cavallaro60578.98%857.14%
Byungho An526.79%17.14%
Michael Weiser506.53%17.14%
Rayagond Kokatanur496.40%214.29%
damuzi00091.17%17.14%
Corentin Labbe10.13%17.14%
Total766100.00%14100.00%
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