1 /*
2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/etherdevice.h>
18 
19 #include "wil6210.h"
20 
21 static int wil_open(struct net_device *ndev)
22 {
23 	struct wil6210_priv *wil = ndev_to_wil(ndev);
24 
25 	return wil_up(wil);
26 }
27 
28 static int wil_stop(struct net_device *ndev)
29 {
30 	struct wil6210_priv *wil = ndev_to_wil(ndev);
31 
32 	return wil_down(wil);
33 }
34 
35 static int wil_change_mtu(struct net_device *ndev, int new_mtu)
36 {
37 	struct wil6210_priv *wil = ndev_to_wil(ndev);
38 
39 	if (new_mtu < 68 || new_mtu > IEEE80211_MAX_DATA_LEN_DMG)
40 		return -EINVAL;
41 
42 	wil_dbg_misc(wil, "change MTU %d -> %d\n", ndev->mtu, new_mtu);
43 	ndev->mtu = new_mtu;
44 
45 	return 0;
46 }
47 
48 static const struct net_device_ops wil_netdev_ops = {
49 	.ndo_open		= wil_open,
50 	.ndo_stop		= wil_stop,
51 	.ndo_start_xmit		= wil_start_xmit,
52 	.ndo_set_mac_address	= eth_mac_addr,
53 	.ndo_validate_addr	= eth_validate_addr,
54 	.ndo_change_mtu		= wil_change_mtu,
55 };
56 
57 static int wil6210_netdev_poll_rx(struct napi_struct *napi, int budget)
58 {
59 	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
60 						napi_rx);
61 	int quota = budget;
62 	int done;
63 
64 	wil_rx_handle(wil, &quota);
65 	done = budget - quota;
66 
67 	if (done <= 1) { /* burst ends - only one packet processed */
68 		napi_complete(napi);
69 		wil6210_unmask_irq_rx(wil);
70 		wil_dbg_txrx(wil, "NAPI RX complete\n");
71 	}
72 
73 	wil_dbg_txrx(wil, "NAPI RX poll(%d) done %d\n", budget, done);
74 
75 	return done;
76 }
77 
78 static int wil6210_netdev_poll_tx(struct napi_struct *napi, int budget)
79 {
80 	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
81 						napi_tx);
82 	int tx_done = 0;
83 	uint i;
84 
85 	/* always process ALL Tx complete, regardless budget - it is fast */
86 	for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
87 		struct vring *vring = &wil->vring_tx[i];
88 
89 		if (!vring->va)
90 			continue;
91 
92 		tx_done += wil_tx_complete(wil, i);
93 	}
94 
95 	if (tx_done <= 1) { /* burst ends - only one packet processed */
96 		napi_complete(napi);
97 		wil6210_unmask_irq_tx(wil);
98 		wil_dbg_txrx(wil, "NAPI TX complete\n");
99 	}
100 
101 	wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
102 
103 	return min(tx_done, budget);
104 }
105 
106 void *wil_if_alloc(struct device *dev, void __iomem *csr)
107 {
108 	struct net_device *ndev;
109 	struct wireless_dev *wdev;
110 	struct wil6210_priv *wil;
111 	struct ieee80211_channel *ch;
112 	int rc = 0;
113 
114 	wdev = wil_cfg80211_init(dev);
115 	if (IS_ERR(wdev)) {
116 		dev_err(dev, "wil_cfg80211_init failed\n");
117 		return wdev;
118 	}
119 
120 	wil = wdev_to_wil(wdev);
121 	wil->csr = csr;
122 	wil->wdev = wdev;
123 
124 	rc = wil_priv_init(wil);
125 	if (rc) {
126 		dev_err(dev, "wil_priv_init failed\n");
127 		goto out_wdev;
128 	}
129 
130 	wdev->iftype = NL80211_IFTYPE_STATION; /* TODO */
131 	/* default monitor channel */
132 	ch = wdev->wiphy->bands[IEEE80211_BAND_60GHZ]->channels;
133 	cfg80211_chandef_create(&wdev->preset_chandef, ch, NL80211_CHAN_NO_HT);
134 
135 	ndev = alloc_netdev(0, "wlan%d", ether_setup);
136 	if (!ndev) {
137 		dev_err(dev, "alloc_netdev_mqs failed\n");
138 		rc = -ENOMEM;
139 		goto out_priv;
140 	}
141 
142 	ndev->netdev_ops = &wil_netdev_ops;
143 	ndev->ieee80211_ptr = wdev;
144 	ndev->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
145 			    NETIF_F_SG | NETIF_F_GRO;
146 	ndev->features |= ndev->hw_features;
147 	SET_NETDEV_DEV(ndev, wiphy_dev(wdev->wiphy));
148 	wdev->netdev = ndev;
149 
150 	netif_napi_add(ndev, &wil->napi_rx, wil6210_netdev_poll_rx,
151 		       WIL6210_NAPI_BUDGET);
152 	netif_napi_add(ndev, &wil->napi_tx, wil6210_netdev_poll_tx,
153 		       WIL6210_NAPI_BUDGET);
154 
155 	wil_link_off(wil);
156 
157 	return wil;
158 
159  out_priv:
160 	wil_priv_deinit(wil);
161 
162  out_wdev:
163 	wil_wdev_free(wil);
164 
165 	return ERR_PTR(rc);
166 }
167 
168 void wil_if_free(struct wil6210_priv *wil)
169 {
170 	struct net_device *ndev = wil_to_ndev(wil);
171 	if (!ndev)
172 		return;
173 
174 	free_netdev(ndev);
175 	wil_priv_deinit(wil);
176 	wil_wdev_free(wil);
177 }
178 
179 int wil_if_add(struct wil6210_priv *wil)
180 {
181 	struct net_device *ndev = wil_to_ndev(wil);
182 	int rc;
183 
184 	rc = register_netdev(ndev);
185 	if (rc < 0) {
186 		dev_err(&ndev->dev, "Failed to register netdev: %d\n", rc);
187 		return rc;
188 	}
189 
190 	wil_link_off(wil);
191 
192 	return 0;
193 }
194 
195 void wil_if_remove(struct wil6210_priv *wil)
196 {
197 	struct net_device *ndev = wil_to_ndev(wil);
198 
199 	unregister_netdev(ndev);
200 }
201