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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8137b6ef0c
Ping problems with packets > 8191 as shown:
PING 192.168.1.99 (192.168.1.99) 8150(8178) bytes of data.
8158 bytes from 192.168.1.99: icmp_seq=1 ttl=64 time=0.669 ms
wrong data byte 8144 should be 0xd0 but was 0x0
16 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
%< ---------------snip--------------------------------------
8112 b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf
c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf
8144 0 0 0 0 d0 d1
^^^^^^^
Notice the 4 bytes of 0 before the expected byte of d0.
Databook notes that the RX buffer must be a multiple of 4/8/16
bytes [1].
Update the DMA Buffer size define to 8188 instead of 8192. Remove
the -1 from the RX buffer size allocations and use the new
DMA Buffer size directly.
[1] Synopsys DesignWare Cores Ethernet MAC Universal v3.70a
[section 8.4.2 - Table 8-24]
Tested on SoCFPGA Stratix10 with ping sweep from 100 to 8300 byte packets.
Fixes: 286a837217 ("stmmac: add CHAINED descriptor mode support (V4)")
Suggested-by: Jose Abreu <jose.abreu@synopsys.com>
Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
126 lines
3.6 KiB
C
126 lines
3.6 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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{
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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)
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{
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p->des1 |= cpu_to_le32(((BUF_SIZE_2KiB - 1)
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<< RDES1_BUFFER2_SIZE_SHIFT)
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& RDES1_BUFFER2_SIZE_MASK);
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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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