diff options
author | Scott Feldman <scofeldm@cisco.com> | 2008-09-15 12:17:11 -0400 |
---|---|---|
committer | Jeff Garzik <jgarzik@redhat.com> | 2008-09-18 11:34:53 -0400 |
commit | 01f2e4ead2c51226ed1283ef6a8388ca6f4cff8f (patch) | |
tree | b1cc2ef1a191a3bf00f371d5dbc2028e1fee01c5 /drivers/net/enic/vnic_rq.c | |
parent | 452c1ce218a68b5dbd626397ecfc65ca89dd3cbb (diff) |
enic: add Cisco 10G Ethernet NIC driver
Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/enic/vnic_rq.c')
-rw-r--r-- | drivers/net/enic/vnic_rq.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/net/enic/vnic_rq.c b/drivers/net/enic/vnic_rq.c new file mode 100644 index 000000000000..9365e63e821a --- /dev/null +++ b/drivers/net/enic/vnic_rq.c | |||
@@ -0,0 +1,199 @@ | |||
1 | /* | ||
2 | * Copyright 2008 Cisco Systems, Inc. All rights reserved. | ||
3 | * Copyright 2007 Nuova Systems, Inc. All rights reserved. | ||
4 | * | ||
5 | * This program is free software; you may redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; version 2 of the License. | ||
8 | * | ||
9 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
10 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
11 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
12 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | ||
13 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | ||
14 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
15 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
16 | * SOFTWARE. | ||
17 | * | ||
18 | */ | ||
19 | |||
20 | #include <linux/kernel.h> | ||
21 | #include <linux/errno.h> | ||
22 | #include <linux/types.h> | ||
23 | #include <linux/pci.h> | ||
24 | #include <linux/delay.h> | ||
25 | |||
26 | #include "vnic_dev.h" | ||
27 | #include "vnic_rq.h" | ||
28 | |||
29 | static int vnic_rq_alloc_bufs(struct vnic_rq *rq) | ||
30 | { | ||
31 | struct vnic_rq_buf *buf; | ||
32 | struct vnic_dev *vdev; | ||
33 | unsigned int i, j, count = rq->ring.desc_count; | ||
34 | unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); | ||
35 | |||
36 | vdev = rq->vdev; | ||
37 | |||
38 | for (i = 0; i < blks; i++) { | ||
39 | rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); | ||
40 | if (!rq->bufs[i]) { | ||
41 | printk(KERN_ERR "Failed to alloc rq_bufs\n"); | ||
42 | return -ENOMEM; | ||
43 | } | ||
44 | } | ||
45 | |||
46 | for (i = 0; i < blks; i++) { | ||
47 | buf = rq->bufs[i]; | ||
48 | for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { | ||
49 | buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; | ||
50 | buf->desc = (u8 *)rq->ring.descs + | ||
51 | rq->ring.desc_size * buf->index; | ||
52 | if (buf->index + 1 == count) { | ||
53 | buf->next = rq->bufs[0]; | ||
54 | break; | ||
55 | } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { | ||
56 | buf->next = rq->bufs[i + 1]; | ||
57 | } else { | ||
58 | buf->next = buf + 1; | ||
59 | buf++; | ||
60 | } | ||
61 | } | ||
62 | } | ||
63 | |||
64 | rq->to_use = rq->to_clean = rq->bufs[0]; | ||
65 | rq->buf_index = 0; | ||
66 | |||
67 | return 0; | ||
68 | } | ||
69 | |||
70 | void vnic_rq_free(struct vnic_rq *rq) | ||
71 | { | ||
72 | struct vnic_dev *vdev; | ||
73 | unsigned int i; | ||
74 | |||
75 | vdev = rq->vdev; | ||
76 | |||
77 | vnic_dev_free_desc_ring(vdev, &rq->ring); | ||
78 | |||
79 | for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { | ||
80 | kfree(rq->bufs[i]); | ||
81 | rq->bufs[i] = NULL; | ||
82 | } | ||
83 | |||
84 | rq->ctrl = NULL; | ||
85 | } | ||
86 | |||
87 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, | ||
88 | unsigned int desc_count, unsigned int desc_size) | ||
89 | { | ||
90 | int err; | ||
91 | |||
92 | rq->index = index; | ||
93 | rq->vdev = vdev; | ||
94 | |||
95 | rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); | ||
96 | if (!rq->ctrl) { | ||
97 | printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); | ||
98 | return -EINVAL; | ||
99 | } | ||
100 | |||
101 | vnic_rq_disable(rq); | ||
102 | |||
103 | err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); | ||
104 | if (err) | ||
105 | return err; | ||
106 | |||
107 | err = vnic_rq_alloc_bufs(rq); | ||
108 | if (err) { | ||
109 | vnic_rq_free(rq); | ||
110 | return err; | ||
111 | } | ||
112 | |||
113 | return 0; | ||
114 | } | ||
115 | |||
116 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, | ||
117 | unsigned int error_interrupt_enable, | ||
118 | unsigned int error_interrupt_offset) | ||
119 | { | ||
120 | u64 paddr; | ||
121 | u32 fetch_index; | ||
122 | |||
123 | paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; | ||
124 | writeq(paddr, &rq->ctrl->ring_base); | ||
125 | iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); | ||
126 | iowrite32(cq_index, &rq->ctrl->cq_index); | ||
127 | iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); | ||
128 | iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); | ||
129 | iowrite32(0, &rq->ctrl->dropped_packet_count); | ||
130 | iowrite32(0, &rq->ctrl->error_status); | ||
131 | |||
132 | /* Use current fetch_index as the ring starting point */ | ||
133 | fetch_index = ioread32(&rq->ctrl->fetch_index); | ||
134 | rq->to_use = rq->to_clean = | ||
135 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | ||
136 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | ||
137 | iowrite32(fetch_index, &rq->ctrl->posted_index); | ||
138 | |||
139 | rq->buf_index = 0; | ||
140 | } | ||
141 | |||
142 | unsigned int vnic_rq_error_status(struct vnic_rq *rq) | ||
143 | { | ||
144 | return ioread32(&rq->ctrl->error_status); | ||
145 | } | ||
146 | |||
147 | void vnic_rq_enable(struct vnic_rq *rq) | ||
148 | { | ||
149 | iowrite32(1, &rq->ctrl->enable); | ||
150 | } | ||
151 | |||
152 | int vnic_rq_disable(struct vnic_rq *rq) | ||
153 | { | ||
154 | unsigned int wait; | ||
155 | |||
156 | iowrite32(0, &rq->ctrl->enable); | ||
157 | |||
158 | /* Wait for HW to ACK disable request */ | ||
159 | for (wait = 0; wait < 100; wait++) { | ||
160 | if (!(ioread32(&rq->ctrl->running))) | ||
161 | return 0; | ||
162 | udelay(1); | ||
163 | } | ||
164 | |||
165 | printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); | ||
166 | |||
167 | return -ETIMEDOUT; | ||
168 | } | ||
169 | |||
170 | void vnic_rq_clean(struct vnic_rq *rq, | ||
171 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) | ||
172 | { | ||
173 | struct vnic_rq_buf *buf; | ||
174 | u32 fetch_index; | ||
175 | |||
176 | BUG_ON(ioread32(&rq->ctrl->enable)); | ||
177 | |||
178 | buf = rq->to_clean; | ||
179 | |||
180 | while (vnic_rq_desc_used(rq) > 0) { | ||
181 | |||
182 | (*buf_clean)(rq, buf); | ||
183 | |||
184 | buf = rq->to_clean = buf->next; | ||
185 | rq->ring.desc_avail++; | ||
186 | } | ||
187 | |||
188 | /* Use current fetch_index as the ring starting point */ | ||
189 | fetch_index = ioread32(&rq->ctrl->fetch_index); | ||
190 | rq->to_use = rq->to_clean = | ||
191 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | ||
192 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | ||
193 | iowrite32(fetch_index, &rq->ctrl->posted_index); | ||
194 | |||
195 | rq->buf_index = 0; | ||
196 | |||
197 | vnic_dev_clear_desc_ring(&rq->ring); | ||
198 | } | ||
199 | |||