src/patches/suse-2.6.27.25/patches.suse/scsi-netlink-ml

   1 Subject: Netlink interface for SCSI sense codes
   2 From: Hannes Reinecke <hare@suse.de>
   3 Date: Fri Nov 21 10:08:01 2008 +0100:
   4 Git: 97746dc5543ef9113c927022dc54ccd26915563d
   5
   6 Inform the userspace about SCSI sense codes; some of them
   7 carry vital information where userspace should react to.
   8
   9 Signed-off-by: Hannes Reinecke <hare@suse.de>
  10
  11 diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
  12 index 3863617..266e5a5 100644
  13 --- a/drivers/scsi/scsi_error.c
  14 +++ b/drivers/scsi/scsi_error.c
  15 @@ -24,6 +24,8 @@
  16  #include <linux/interrupt.h>
  17  #include <linux/blkdev.h>
  18  #include <linux/delay.h>
  19 +#include <linux/netlink.h>
  20 +#include <net/netlink.h>
  21
  22  #include <scsi/scsi.h>
  23  #include <scsi/scsi_cmnd.h>
  24 @@ -33,6 +35,7 @@
  25  #include <scsi/scsi_transport.h>
  26  #include <scsi/scsi_host.h>
  27  #include <scsi/scsi_ioctl.h>
  28 +#include <scsi/scsi_netlink_ml.h>
  29
  30  #include "scsi_priv.h"
  31  #include "scsi_logging.h"
  32 @@ -224,6 +227,80 @@ static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
  33  }
  34  #endif
  35
  36 +#ifdef CONFIG_SCSI_NETLINK
  37 +/**
  38 + * scsi_post_sense_event - called to post a 'Sense Code' event
  39 + *
  40 + * @sdev:              SCSI device the sense code occured on
  41 + * @sshdr:             SCSI sense code
  42 + *
  43 + * Returns:
  44 + *   0 on succesful return
  45 + *   otherwise, failing error code
  46 + *
  47 + */
  48 +static void scsi_post_sense_event(struct scsi_device *sdev,
  49 +                       struct scsi_sense_hdr *sshdr)
  50 +{
  51 +       struct sk_buff *skb;
  52 +       struct nlmsghdr *nlh;
  53 +       struct scsi_nl_sense_msg *msg;
  54 +       u32 len, skblen;
  55 +       int err;
  56 +
  57 +       if (!scsi_nl_sock) {
  58 +               err = -ENOENT;
  59 +               goto send_fail;
  60 +       }
  61 +
  62 +       len = SCSI_NL_MSGALIGN(sizeof(*msg));
  63 +       skblen = NLMSG_SPACE(len);
  64 +
  65 +       skb = alloc_skb(skblen, GFP_ATOMIC);
  66 +       if (!skb) {
  67 +               err = -ENOBUFS;
  68 +               goto send_fail;
  69 +       }
  70 +
  71 +       nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
  72 +                               skblen - sizeof(*nlh), 0);
  73 +       if (!nlh) {
  74 +               err = -ENOBUFS;
  75 +               goto send_fail_skb;
  76 +       }
  77 +       msg = NLMSG_DATA(nlh);
  78 +
  79 +       INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT_ML,
  80 +                        ML_NL_SCSI_SENSE, len);
  81 +       msg->host_no = sdev->host->host_no;
  82 +       msg->channel = sdev->channel;
  83 +       msg->id = sdev->id;
  84 +       msg->lun = sdev->lun;
  85 +       msg->sense = (sshdr->response_code << 24) | (sshdr->sense_key << 16) |
  86 +               (sshdr->asc << 8) | sshdr->ascq;
  87 +
  88 +       err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_ML_EVENTS,
  89 +                             GFP_ATOMIC);
  90 +       if (err && (err != -ESRCH))
  91 +               /* nlmsg_multicast already kfree_skb'd */
  92 +               goto send_fail;
  93 +
  94 +       return;
  95 +
  96 +send_fail_skb:
  97 +       kfree_skb(skb);
  98 +send_fail:
  99 +       sdev_printk(KERN_WARNING, sdev,
 100 +                   "Dropped SCSI Msg %02x/%02x/%02x/%02x: err %d\n",
 101 +                   sshdr->response_code, sshdr->sense_key,
 102 +                   sshdr->asc, sshdr->ascq, err);
 103 +       return;
 104 +}
 105 +#else
 106 +static inline void scsi_post_sense_event(struct scsi_device *sdev,
 107 +                          struct scsi_sense_hdr *sshdr) {}
 108 +#endif
 109 +
 110  /**
 111   * scsi_check_sense - Examine scsi cmd sense
 112   * @scmd:      Cmd to have sense checked.
 113 @@ -246,6 +323,8 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 114         if (scsi_sense_is_deferred(&sshdr))
 115                 return NEEDS_RETRY;
 116
 117 +       scsi_post_sense_event(sdev, &sshdr);
 118 +
 119         if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh &&
 120                         sdev->scsi_dh_data->scsi_dh->check_sense) {
 121                 int rc;
 122 diff --git a/include/scsi/scsi_netlink.h b/include/scsi/scsi_netlink.h
 123 index 536752c..ac7c766 100644
 124 --- a/include/scsi/scsi_netlink.h
 125 +++ b/include/scsi/scsi_netlink.h
 126 @@ -35,7 +35,8 @@
 127  /* SCSI Transport Broadcast Groups */
 128         /* leaving groups 0 and 1 unassigned */
 129  #define SCSI_NL_GRP_FC_EVENTS          (1<<2)          /* Group 2 */
 130 -#define SCSI_NL_GRP_CNT                        3
 131 +#define SCSI_NL_GRP_ML_EVENTS          (1<<3)          /* Group 3 */
 132 +#define SCSI_NL_GRP_CNT                        4
 133
 134
 135  /* SCSI_TRANSPORT_MSG event message header */
 136 @@ -56,7 +57,8 @@ struct scsi_nl_hdr {
 137  /* scsi_nl_hdr->transport value */
 138  #define SCSI_NL_TRANSPORT                      0
 139  #define SCSI_NL_TRANSPORT_FC                   1
 140 -#define SCSI_NL_MAX_TRANSPORTS                 2
 141 +#define SCSI_NL_TRANSPORT_ML                   2
 142 +#define SCSI_NL_MAX_TRANSPORTS                 3
 143
 144  /* Transport-based scsi_nl_hdr->msgtype values are defined in each transport */
 145
 146 diff --git a/include/scsi/scsi_netlink_ml.h b/include/scsi/scsi_netlink_ml.h
 147 new file mode 100644
 148 index 0000000..c988458
 149 --- /dev/null
 150 +++ b/include/scsi/scsi_netlink_ml.h
 151 @@ -0,0 +1,64 @@
 152 +/*
 153 + *  SCSI Midlayer Netlink Interface
 154 + *
 155 + *  Copyright (C) 2008 Hannes Reinecke, SuSE Linux Products GmbH
 156 + *
 157 + *  This program is free software; you can redistribute it and/or modify
 158 + *  it under the terms of the GNU General Public License as published by
 159 + *  the Free Software Foundation; either version 2 of the License, or
 160 + *  (at your option) any later version.
 161 + *
 162 + *  This program is distributed in the hope that it will be useful,
 163 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 164 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 165 + *  GNU General Public License for more details.
 166 + *
 167 + *  You should have received a copy of the GNU General Public License
 168 + *  along with this program; if not, write to the Free Software
 169 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 170 + *
 171 + */
 172 +#ifndef SCSI_NETLINK_ML_H
 173 +#define SCSI_NETLINK_ML_H
 174 +
 175 +#include <scsi/scsi_netlink.h>
 176 +
 177 +/*
 178 + * This file intended to be included by both kernel and user space
 179 + */
 180 +
 181 +/*
 182 + * FC Transport Message Types
 183 + */
 184 +       /* kernel -> user */
 185 +#define ML_NL_SCSI_SENSE                       0x0100
 186 +       /* user -> kernel */
 187 +/* none */
 188 +
 189 +
 190 +/*
 191 + * Message Structures :
 192 + */
 193 +
 194 +/* macro to round up message lengths to 8byte boundary */
 195 +#define SCSI_NL_MSGALIGN(len)          (((len) + 7) & ~7)
 196 +
 197 +
 198 +/*
 199 + * SCSI Midlayer SCSI Sense messages :
 200 + *   SCSI_NL_SCSI_SENSE
 201 + *
 202 + */
 203 +struct scsi_nl_sense_msg {
 204 +       struct scsi_nl_hdr snlh;                /* must be 1st element ! */
 205 +       uint64_t seconds;
 206 +       u64 id;
 207 +       u64 lun;
 208 +       u16 host_no;
 209 +       u16 channel;
 210 +       u32 sense;
 211 +} __attribute__((aligned(sizeof(uint64_t))));
 212 +
 213 +
 214 +#endif /* SCSI_NETLINK_ML_H */
 215 +