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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e041f65d5f
The brcmsmac internal tx buffering is problematic. The amount of buffering is excessive (228 packets in addition to the 256 slots in each DMA ring), and frames may be dropped due to a lack of flow control. This patch reworks the transmit code path to remove the internal buffering. Frames are immediately handed off to the DMA support rather than passing through an intermediate queue. Non-aggregate frames are queued immediately into the tx rings, and aggregate frames are queued temporarily in an AMPDU session until ready for transmit. Transmit flow control is also added to avoid dropping packets when the tx rings are full. Conceptually this is a separate change, but it's included in this commit because removing the tx queue without adding flow control could cause significant problems. Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com> Reviewed-by: Arend van Spriel <arend@broadcom.com> Tested-by: Daniel Wagner <wagi@monom.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
/*
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* Copyright (c) 2010 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _BRCM_AMPDU_H_
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#define _BRCM_AMPDU_H_
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/*
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* Data structure representing an in-progress session for accumulating
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* frames for AMPDU.
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*
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* wlc: pointer to common driver data
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* skb_list: queue of skb's for AMPDU
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* max_ampdu_len: maximum length for this AMPDU
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* max_ampdu_frames: maximum number of frames for this AMPDU
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* ampdu_len: total number of bytes accumulated for this AMPDU
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* dma_len: DMA length of this AMPDU
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*/
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struct brcms_ampdu_session {
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struct brcms_c_info *wlc;
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struct sk_buff_head skb_list;
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unsigned max_ampdu_len;
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u16 max_ampdu_frames;
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u16 ampdu_len;
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u16 dma_len;
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};
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extern void brcms_c_ampdu_reset_session(struct brcms_ampdu_session *session,
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struct brcms_c_info *wlc);
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extern int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session,
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struct sk_buff *p);
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extern void brcms_c_ampdu_finalize(struct brcms_ampdu_session *session);
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extern struct ampdu_info *brcms_c_ampdu_attach(struct brcms_c_info *wlc);
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extern void brcms_c_ampdu_detach(struct ampdu_info *ampdu);
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extern void brcms_c_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb,
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struct sk_buff *p, struct tx_status *txs);
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extern void brcms_c_ampdu_macaddr_upd(struct brcms_c_info *wlc);
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extern void brcms_c_ampdu_shm_upd(struct ampdu_info *ampdu);
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#endif /* _BRCM_AMPDU_H_ */
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