2 /**************************************************************************
4 Copyright (c) 2007, Chelsio Inc.
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 1. Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
13 2. Neither the name of the Chelsio Corporation nor the names of its
14 contributors may be used to endorse or promote products derived from
15 this software without specific prior written permission.
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 POSSIBILITY OF SUCH DAMAGE.
32 ***************************************************************************/
37 /* Should be 1 or 2 indicating single or double kernel buffers. */
38 #define NUM_DDP_KBUF 2
40 /* min receive window for a connection to be considered for DDP */
41 #define MIN_DDP_RCV_WIN (48 << 10)
43 /* amount of Rx window not available to DDP to avoid window exhaustion */
44 #define DDP_RSVD_WIN (16 << 10)
46 /* # of sentinel invalid page pods at the end of a group of valid page pods */
47 #define NUM_SENTINEL_PPODS 0
49 /* # of pages a pagepod can hold without needing another pagepod */
52 /* page pods are allocated in groups of this size (must be power of 2) */
53 #define PPOD_CLUSTER_SIZE 16
55 /* for each TID we reserve this many page pods up front */
56 #define RSVD_PPODS_PER_TID 1
60 uint32_t pp_pgsz_tag_color;
61 uint32_t pp_max_offset;
62 uint32_t pp_page_offset;
67 #define PPOD_SIZE sizeof(struct pagepod)
70 #define M_PPOD_TID 0xFFFFFF
71 #define V_PPOD_TID(x) ((x) << S_PPOD_TID)
73 #define S_PPOD_VALID 24
74 #define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
75 #define F_PPOD_VALID V_PPOD_VALID(1U)
77 #define S_PPOD_COLOR 0
78 #define M_PPOD_COLOR 0x3F
79 #define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
82 #define M_PPOD_TAG 0xFFFFFF
83 #define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
85 #define S_PPOD_PGSZ 30
86 #define M_PPOD_PGSZ 0x3
87 #define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
91 #include <vm/vm_page.h>
92 #include <machine/bus.h>
94 /* DDP gather lists can specify an offset only for the first page. */
95 struct ddp_gather_list {
96 unsigned int dgl_length;
97 unsigned int dgl_offset;
98 unsigned int dgl_nelem;
100 bus_addr_t dgl_phys_addr[0];
103 struct ddp_buf_state {
104 unsigned int cur_offset; /* offset of latest DDP notification */
106 struct ddp_gather_list *gl;
110 struct pci_dev *pdev;
111 struct ddp_buf_state buf_state[2]; /* per buffer state */
113 unsigned short kbuf_noinval;
114 unsigned short kbuf_idx; /* which HW buffer is used for kbuf */
115 struct ddp_gather_list *ubuf;
116 unsigned int ubuf_nppods; /* # of page pods for buffer 1 */
117 unsigned int ubuf_tag;
118 unsigned int ubuf_ddp_ready;
120 unsigned int kbuf_posted;
122 unsigned int kbuf_nppods[NUM_DDP_KBUF];
123 unsigned int kbuf_tag[NUM_DDP_KBUF];
124 struct ddp_gather_list *kbuf[NUM_DDP_KBUF]; /* kernel buffer for DDP prefetch */
127 /* buf_state flags */
129 DDP_BF_NOINVAL = 1 << 0, /* buffer is set to NO_INVALIDATE */
130 DDP_BF_NOCOPY = 1 << 1, /* DDP to final dest, no copy needed */
131 DDP_BF_NOFLIP = 1 << 2, /* buffer flips after GET_TCB_RPL */
132 DDP_BF_PSH = 1 << 3, /* set in skb->flags if the a DDP was
133 completed with a segment having the
139 * Returns 1 if a UBUF DMA buffer might be active.
141 static inline int t3_ddp_ubuf_pending(struct sock *so)
143 struct tcp_sock *tp = tcp_sk(sk);
144 struct ddp_state *p = DDP_STATE(tp);
146 /* When the TOM_TUNABLE(ddp) is enabled, we're always in ULP_MODE DDP,
147 * but DDP_STATE() is only valid if the connection actually enabled
153 return (p->buf_state[0].flags & (DDP_BF_NOFLIP | DDP_BF_NOCOPY)) ||
154 (p->buf_state[1].flags & (DDP_BF_NOFLIP | DDP_BF_NOCOPY));
158 int t3_setup_ppods(struct socket *so, const struct ddp_gather_list *gl,
159 unsigned int nppods, unsigned int tag, unsigned int maxoff,
160 unsigned int pg_off, unsigned int color);
161 int t3_alloc_ppods(struct tom_data *td, unsigned int n);
162 void t3_free_ppods(struct tom_data *td, unsigned int tag, unsigned int n);
163 void t3_free_ddp_gl(struct pci_dev *pdev, struct ddp_gather_list *gl);
164 int t3_pin_pages(struct pci_dev *pdev, unsigned long uaddr, size_t len,
165 struct ddp_gather_list **newgl,
166 const struct ddp_gather_list *gl);
167 int t3_ddp_copy(const struct mbuf *skb, int offset, struct iovec *to,
169 //void t3_repost_kbuf(struct socket *so, int modulate, int activate);
170 void t3_post_kbuf(struct socket *so, int modulate);
171 int t3_post_ubuf(struct socket *so, const struct iovec *iov, int nonblock,
172 int rcv_flags, int modulate, int post_kbuf);
173 void t3_cancel_ubuf(struct socket *so);
174 int t3_overlay_ubuf(struct socket *so, const struct iovec *iov, int nonblock,
175 int rcv_flags, int modulate, int post_kbuf);
176 int t3_enter_ddp(struct socket *so, unsigned int kbuf_size, unsigned int waitall);
177 void t3_cleanup_ddp(struct socket *so);
178 void t3_release_ddp_resources(struct toepcb *toep);
179 void t3_cancel_ddpbuf(struct socket *so, unsigned int bufidx);
180 void t3_overlay_ddpbuf(struct socket *so, unsigned int bufidx, unsigned int tag0,
181 unsigned int tag1, unsigned int len);
182 void t3_setup_ddpbufs(struct socket *so, unsigned int len0, unsigned int offset0,
183 unsigned int len1, unsigned int offset1,
184 uint64_t ddp_flags, uint64_t flag_mask, int modulate);
185 #endif /* T3_DDP_H */