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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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583e636141
We always program the maximum DMA buffer size into the receive descriptor, although the allocated size may be less. E.g. with the default MTU size we allocate only 1536 bytes. If somebody sends us a bigger frame, then memory may get corrupted. Fix by using exact buffer sizes. Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*******************************************************************************
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Header File to describe Normal/enhanced descriptor functions used for RING
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and CHAINED modes.
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Copyright(C) 2011 STMicroelectronics Ltd
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It defines all the functions used to handle the normal/enhanced
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descriptors in case of the DMA is configured to work in chained or
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in ring mode.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#ifndef __DESC_COM_H__
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#define __DESC_COM_H__
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/* Specific functions used for Ring mode */
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/* Enhanced descriptors */
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static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end,
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int bfsize)
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{
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if (bfsize == BUF_SIZE_16KiB)
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p->des1 |= cpu_to_le32((BUF_SIZE_8KiB
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<< ERDES1_BUFFER2_SIZE_SHIFT)
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& ERDES1_BUFFER2_SIZE_MASK);
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if (end)
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p->des1 |= cpu_to_le32(ERDES1_END_RING);
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}
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static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
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{
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if (end)
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p->des0 |= cpu_to_le32(ETDES0_END_RING);
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else
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p->des0 &= cpu_to_le32(~ETDES0_END_RING);
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}
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static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
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{
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if (unlikely(len > BUF_SIZE_4KiB)) {
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p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
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<< ETDES1_BUFFER2_SIZE_SHIFT)
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& ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
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& ETDES1_BUFFER1_SIZE_MASK));
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} else
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p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
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}
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/* Normal descriptors */
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static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end, int bfsize)
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{
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if (bfsize >= BUF_SIZE_2KiB) {
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int bfsize2;
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bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);
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p->des1 |= cpu_to_le32((bfsize2 << RDES1_BUFFER2_SIZE_SHIFT)
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& RDES1_BUFFER2_SIZE_MASK);
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}
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if (end)
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p->des1 |= cpu_to_le32(RDES1_END_RING);
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}
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static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
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{
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if (end)
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p->des1 |= cpu_to_le32(TDES1_END_RING);
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else
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p->des1 &= cpu_to_le32(~TDES1_END_RING);
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}
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static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
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{
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if (unlikely(len > BUF_SIZE_2KiB)) {
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unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
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& TDES1_BUFFER1_SIZE_MASK;
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p->des1 |= cpu_to_le32((((len - buffer1)
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<< TDES1_BUFFER2_SIZE_SHIFT)
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& TDES1_BUFFER2_SIZE_MASK) | buffer1);
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} else
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p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
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}
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/* Specific functions used for Chain mode */
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/* Enhanced descriptors */
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static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
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{
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p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
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{
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p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
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}
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static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
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{
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p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
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}
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/* Normal descriptors */
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static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
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{
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p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
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{
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p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
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{
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p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
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}
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#endif /* __DESC_COM_H__ */
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