856d7ba7ed
For performance reasons, this patch uses 2 VIC RQs per RQ presented to DPDK. The VIC requires that each descriptor be marked as either a start of packet (SOP) descriptor or a non-SOP descriptor. A one RQ solution requires skipping descriptors when receiving small packets and results in bad performance when receiving many small packets. The 2 RQ solution makes use of the VIC feature that allows a receive on primary queue to 'spill over' into another queue if the receive is too large to fit in the buffer assigned to the descriptor on the primary queue. This means that there is no skipping of descriptors when receiving small packets and results in much better performance. Signed-off-by: Nelson Escobar <neescoba@cisco.com> Reviewed-by: John Daley <johndale@cisco.com>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
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* Copyright 2007 Nuova Systems, Inc. All rights reserved.
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*
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* Copyright (c) 2014, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _RQ_ENET_DESC_H_
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#define _RQ_ENET_DESC_H_
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/* Ethernet receive queue descriptor: 16B */
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struct rq_enet_desc {
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__le64 address;
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__le16 length_type;
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u8 reserved[6];
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};
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enum rq_enet_type_types {
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RQ_ENET_TYPE_ONLY_SOP = 0,
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RQ_ENET_TYPE_NOT_SOP = 1,
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RQ_ENET_TYPE_RESV2 = 2,
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RQ_ENET_TYPE_RESV3 = 3,
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};
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#define RQ_ENET_ADDR_BITS 64
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#define RQ_ENET_LEN_BITS 14
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#define RQ_ENET_LEN_MASK ((1 << RQ_ENET_LEN_BITS) - 1)
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#define RQ_ENET_TYPE_BITS 2
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#define RQ_ENET_TYPE_MASK ((1 << RQ_ENET_TYPE_BITS) - 1)
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static inline void rq_enet_desc_enc(volatile struct rq_enet_desc *desc,
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u64 address, u8 type, u16 length)
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{
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desc->address = cpu_to_le64(address);
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desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
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((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
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}
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static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
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u64 *address, u8 *type, u16 *length)
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{
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*address = le64_to_cpu(desc->address);
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*length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
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*type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
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RQ_ENET_TYPE_MASK);
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}
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#endif /* _RQ_ENET_DESC_H_ */
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