drivers/net/ethernet/chelsio/cxgb4/srq.c

   1 /*
   2  * This file is part of the Chelsio T6 Ethernet driver for Linux.
   3  *
   4  * Copyright (c) 2017-2018 Chelsio Communications, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "cxgb4.h"
  36 #include "t4_msg.h"
  37 #include "srq.h"
  38
  39 struct srq_data *t4_init_srq(int srq_size)
  40 {
  41         struct srq_data *s;
  42
  43         s = kvzalloc(sizeof(*s), GFP_KERNEL);
  44         if (!s)
  45                 return NULL;
  46
  47         s->srq_size = srq_size;
  48         init_completion(&s->comp);
  49         mutex_init(&s->lock);
  50
  51         return s;
  52 }
  53
  54 /* cxgb4_get_srq_entry: read the SRQ table entry
  55  * @dev: Pointer to the net_device
  56  * @idx: Index to the srq
  57  * @entryp: pointer to the srq entry
  58  *
  59  * Sends CPL_SRQ_TABLE_REQ message for the given index.
  60  * Contents will be returned in CPL_SRQ_TABLE_RPL message.
  61  *
  62  * Returns zero if the read is successful, else a error
  63  * number will be returned. Caller should not use the srq
  64  * entry if the return value is non-zero.
  65  *
  66  *
  67  */
  68 int cxgb4_get_srq_entry(struct net_device *dev,
  69                         int srq_idx, struct srq_entry *entryp)
  70 {
  71         struct cpl_srq_table_req *req;
  72         struct adapter *adap;
  73         struct sk_buff *skb;
  74         struct srq_data *s;
  75         int rc = -ENODEV;
  76
  77         adap = netdev2adap(dev);
  78         s = adap->srq;
  79
  80         if (!(adap->flags & CXGB4_FULL_INIT_DONE) || !s)
  81                 goto out;
  82
  83         skb = alloc_skb(sizeof(*req), GFP_KERNEL);
  84         if (!skb)
  85                 return -ENOMEM;
  86         req = (struct cpl_srq_table_req *)
  87                 __skb_put_zero(skb, sizeof(*req));
  88         INIT_TP_WR(req, 0);
  89         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SRQ_TABLE_REQ,
  90                                               TID_TID_V(srq_idx) |
  91                                 TID_QID_V(adap->sge.fw_evtq.abs_id)));
  92         req->idx = srq_idx;
  93
  94         mutex_lock(&s->lock);
  95
  96         s->entryp = entryp;
  97         t4_mgmt_tx(adap, skb);
  98
  99         rc = wait_for_completion_timeout(&s->comp, SRQ_WAIT_TO);
 100         if (rc)
 101                 rc = 0;
 102         else /* !rc means we timed out */
 103                 rc = -ETIMEDOUT;
 104
 105         WARN_ON_ONCE(entryp->idx != srq_idx);
 106         mutex_unlock(&s->lock);
 107 out:
 108         return rc;
 109 }
 110 EXPORT_SYMBOL(cxgb4_get_srq_entry);
 111
 112 void do_srq_table_rpl(struct adapter *adap,
 113                       const struct cpl_srq_table_rpl *rpl)
 114 {
 115         unsigned int idx = TID_TID_G(GET_TID(rpl));
 116         struct srq_data *s = adap->srq;
 117         struct srq_entry *e;
 118
 119         if (unlikely(rpl->status != CPL_CONTAINS_READ_RPL)) {
 120                 dev_err(adap->pdev_dev,
 121                         "Unexpected SRQ_TABLE_RPL status %u for entry %u\n",
 122                                 rpl->status, idx);
 123                 goto out;
 124         }
 125
 126         /* Store the read entry */
 127         e = s->entryp;
 128         e->valid = 1;
 129         e->idx = idx;
 130         e->pdid = SRQT_PDID_G(be64_to_cpu(rpl->rsvd_pdid));
 131         e->qlen = SRQT_QLEN_G(be32_to_cpu(rpl->qlen_qbase));
 132         e->qbase = SRQT_QBASE_G(be32_to_cpu(rpl->qlen_qbase));
 133         e->cur_msn = be16_to_cpu(rpl->cur_msn);
 134         e->max_msn = be16_to_cpu(rpl->max_msn);
 135 out:
 136         complete(&s->comp);
 137 }