linux/drivers/net/ethernet/stmicro/stmmac/ring_mode.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 291 Based on 2 normalized pattern(s): 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 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 [that] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 57 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.515993066@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-29 22:18:05 +08:00
// 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, 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_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,
};