From: Johannes Berg <johannes@sipsolutions.net>
To: David Lin <dlin@marvell.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
Pete Hsieh <peteh@marvell.com>, Chor Teck Law <ctlaw@marvell.com>
Subject: Re: [PATCH v2] Add new mac80211 driver mwlwifi.
Date: Wed, 17 Jun 2015 09:27:39 +0200 [thread overview]
Message-ID: <1434526059.1884.7.camel@sipsolutions.net> (raw)
In-Reply-To: <2127ea28a2a74cd6a89d45b88caf06cb@SC-EXCH02.marvell.com>
On Wed, 2015-06-17 at 06:06 +0000, David Lin wrote:
(not really reading all of this right now, just two small comments)
> +struct mwl_tx_desc {
> + u8 data_rate;
> + u8 tx_priority;
> + __le16 qos_ctrl;
> + __le32 pkt_ptr;
> + __le16 pkt_len;
> + u8 dest_addr[ETH_ALEN];
> + __le32 pphys_next;
> + __le32 sap_pkt_info;
> + __le32 rate_info;
> + u8 type;
> + u8 xmit_control; /* bit 0: use rateinfo, bit 1: disable ampdu */
> + __le16 reserved;
> + __le32 tcpack_sn;
> + __le32 tcpack_src_dst;
> + struct sk_buff *psk_buff;
> + struct mwl_tx_desc *pnext;
> + u8 reserved1[2];
> + u8 packet_info;
> + u8 packet_id;
> + __le16 packet_len_and_retry;
> + __le16 packet_rate_info;
> + u8 *sta_info;
> + __le32 status;
> +} __packed;
This ... cannot be right. You can't have a pointer in a structure that's
used by firmware, and the __leXX and __packed indicates that it's used
by firmware. But pointer size is variable, so *clearly* this cannot be
correct.
> +struct mwl_rx_desc {
> + __le16 pkt_len; /* total length of received data */
> + __le16 rate; /* receive rate information */
> + __le32 pphys_buff_data; /* physical address of payload data */
> + __le32 pphys_next; /* physical address of next RX desc */
> + __le16 qos_ctrl; /* received QosCtrl field variable */
> + __le16 ht_sig2; /* like name states */
> + __le32 hw_rssi_info;
> + __le32 hw_noise_floor_info;
> + u8 noise_floor;
> + u8 reserved[3];
> + u8 rssi; /* received signal strengt indication */
> + u8 status; /* status field containing USED bit */
> + u8 channel; /* channel this pkt was received on */
> + u8 rx_control; /* the control element of the desc */
> + /* above are 32bits aligned and is same as FW, RxControl put at end
> + * for sync
> + */
> + struct sk_buff *psk_buff; /* associated sk_buff for Linux */
> + void *pbuff_data; /* virtual address of payload data */
> + struct mwl_rx_desc *pnext; /* virtual address of next RX desc */
> +} __packed;
Same here. If you really need to have a firmware and driver struct as
indicated by the comment, you should probably have
struct mwl_rx_info {
/* firmware info */
} __packed;
struct mwl_rx_desc {
struct mwl_rx_info info;
/* driver info */
};
(note the lack of __packed also, __packed often makes accesses far less
efficient)
> +struct mwl_desc_data {
> + dma_addr_t pphys_tx_ring; /* ptr to first TX desc (phys.) */
> + struct mwl_tx_desc *ptx_ring; /* ptr to first TX desc (virt.) */
> + struct mwl_tx_desc *pnext_tx_desc; /* next TX desc that can be used */
> + struct mwl_tx_desc *pstale_tx_desc;/* the staled TX descriptor */
> + dma_addr_t pphys_rx_ring; /* ptr to first RX desc (phys.) */
> + struct mwl_rx_desc *prx_ring; /* ptr to first RX desc (virt.) */
> + struct mwl_rx_desc *pnext_rx_desc; /* next RX desc that can be used */
> + unsigned int wcb_base; /* FW base offset for registers */
> + unsigned int rx_desc_write; /* FW descriptor write position */
> + unsigned int rx_desc_read; /* FW descriptor read position */
> + unsigned int rx_buf_size; /* length of the RX buffers */
> +} __packed;
ditto - don't pack driver structs
Also, you probably really should have two header files - one for the
firmware structs and one for the driver structs - especially since you
seem to be confusing the two!
> +++ b/drivers/net/wireless/mwlwifi/fwcmd.c
There are a lot of struct definitions here that you could move to the
same header file.
> +#if SYSADPT_NUM_OF_DESC_DATA > 3
how does that get set?
> +/* Description: This file implements main functions of this module.
> + */
You still have a pretty strange comment style.
> + hw->flags |= IEEE80211_HW_AMPDU_AGGREGATION;
This was really what I was looking for :)
Note that I changed this entirely in the mac80211-next tree. I don't
know how Kalle wants to handle this, but given that your driver isn't
going to make the cut for 4.2 anyway, you should probably rebase it on
mac80211-next, and then Kalle can pick it up after he merges that back
from net-next, or perhaps after the merge window closes.
[snip rest]
johannes
next prev parent reply other threads:[~2015-06-17 7:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-17 6:06 [PATCH v2] Add new mac80211 driver mwlwifi David Lin
2015-06-17 7:27 ` Johannes Berg [this message]
2015-06-17 8:07 ` David Lin
2015-06-17 8:27 ` Johannes Berg
2015-06-17 8:34 ` David Lin
2015-06-17 14:32 ` Dan Williams
2015-06-17 14:42 ` David Lin
2015-06-17 14:30 ` Dan Williams
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