aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/iscsi_tcp.c
AgeCommit message (Collapse)Author
2007-06-17[SCSI] iscsi_tcp: convert to use the data buffer accessorsFUJITA Tomonori
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. TODO: use scsi_for_each_sg(). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] iscsi class, iscsi_tcp, iser, qla4xxx: add netdevname sysfs attrMike Christie
iSCSI must support software iscsi (iscsi_tcp, iser), hardware iscsi (qla4xxx), and partial offload (broadcom). To be able to allow each stack or driver or port (virtual or physical) to be able to log into the same target portal we use the initiator tuple [[HWADDRESS | NETDEVNAME], INITIATOR_NAME] and the target tuple [TARGETNAME, CONN_ADDRESS, CONN_PORT] to id a session. This patch adds the netdev name, which is used by software iscsi when it binds a session to a netdevice using the SO_BINDTODEVICE sock opt. It cannot use HWADDRESS because if someone did vlans then the same netdevice will have the same mac and the initiator,target id will not be unique. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Cc: David C Somayajulu <david.somayajulu@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] iscsi class, qla4xxx, iscsi_tcp: export local addressMike Christie
This patch exports the local address for the session. For qla4xxx this is the ip of the hba's port. For software this is the src addr of the socket. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: David C Somayajulu <david.somayajulu@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] iscsi_tcp: fix fd leakMike Christie
This patch should fix the file descriptor leak problem. A quick look through the kernel shows that users of sockfd_lookup use sockfd_put to release their handle. We were using sock_release which from the comments and code look like it does not release the get() on the file from the lookup. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] iscsi_tcp: remove DMA alignment restrictionMike Christie
Add a slave_configure function to iSCSI TCP to remove any DMA alignment restriction. This permits the use of direct IO from arbitrary addresses. Signed-off-by: Pete Wyckoff <pw@osc.edu> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] iscsi_tcp: fix handling of data buffer paddingMike Christie
If we got the padding, data and header in different skbs, we were not handling the padding correctly because we attributed it to the data's skb. This resulted in the initiator reading from pad bytes + skb offset instead of the correct offset. If you could not connect with the open solaris target, this will fix the lock up problem you were hitting. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] libiscsi: make can_queue configurableMike Christie
This patch allows us to set can_queue and cmds_per_lun from userspace when we create the session/host. From there we can set it on a per target basis. The patch fully converts iscsi_tcp, but only hooks up ib_iser for cmd_per_lun since it currently has a lots of preallocations based on can_queue. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-02[SCSI] libiscsi: fix iscsi cmdsn allocationMike Christie
The cmdsn allocation and pdu transmit code can race, and we can end up sending a pdu with cmdsn 10 before a pdu with 5. The target will then fail the connection/session. This patch fixes the problem by delaying the cmdsn allocation until we are about to send the pdu. This also removes the xmitmutex. We were using the connection xmitmutex during error handling to handle races with mtask and ctask cleanup and completion. For ctasks we now have nice refcounting and for the mtask, if we hit the case where the mtask timesout and it is floating around somewhere in the driver, we end up dropping the session. And to handle session level cleanup, we use the xmit suspend bit along with scsi_flush_queue and the session lock to make sure that the xmit thread is not possibly transmitting a task while we are trying to kill it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] iscsi tcp: fix iscsi xmit state machineMike Christie
If iscsi_tcp partially sends a header, it would recalculate the header size and readd the size of the digest (if header digests are used).This would cause us to send sizeof(digest) extra bytes when we sent the rest of the header. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] iscsi class, iscsi_tcp, ib_iser: add sysfs chap fileMike Christie
The attached patches add sysfs files for the chap settings to the iscsi transport class, iscsi_tcp and ib_iser. This is needed for software iscsi because there are times when iscsid can die and it will need to reread the values it was using. And it is needed by qla4xxx for basic management opertaions. This patch does not hook in qla4xxx yet, because I am not sure the mbx command to use. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] iscsi: Some fixes in preparation for bidirectional support - total_lengthMike Christie
- Remove shadow of request length from struct iscsi_cmd_task. - change all users to use scsi_cmnd->request_bufflen directly (With bidi we will use scsi-ml API to retrieve in/out length) Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] iscsi: Some fixes in preparation for bidirectional support - exp_datasnMike Christie
This patch fixes handling of expected datasn/r2tsn as received from target. It is done according to: T10 rfc3720 section 3.2.2.3. Data Sequencing. . unify expected datasn/r2tsn into one counter . calculate than check expected datasn/r2tsn. On error print a message and fail the request. (TODO use iscsi retransmits) . remove the FIXME ;) . avoid zero length memset Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] iscsi class, qla4xxx, iscsi_tcp, ib_iser: export/set initiator nameMike Christie
For iscsi root boot, software iscsi needs to know what the BIOS/OF initiator used for the initiator name so this puts it in sysfs for userspace to be able to pick up. For hw iscsi, it is nice to see what the card is using. This patch adds the new param, and hooks in qla4xxx, iscsi_tcp, and ib_iser. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Cc: David C Somayajulu <david.somayajulu@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-06-01[SCSI] libiscsi, iscsi_tcp, ib_iser : add sw iscsi host get/set params helpersMike Christie
iscsid and udev need to key off the hw address being used so add some helpers for iser and iscsi tcp. Also convert them Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-03-11[SCSI] iscsi_tcp: print useful error message when iscsi crc23c allocation failsMike Christie
People do not read the README and seem to like to unselect the crc32c module even though iscsi_tcp selects it for them. This patch spits a error that tells the user that they really do need the module. Hopefully, we will get fewer people asking about this now. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-03-11[SCSI] iscsi_tcp: increase max_sectorsMike Christie
For a while now, the block layer has seperated max sectors and max hw sectors. Software iscsi has no limit so this patch increases max hw sectors, so we can support large pass through commands. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-03-11[SCSI] iscsi: rename DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTHMike Christie
This patch renames DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH to avoid confusion with the drivers default values (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH is the iscsi RFC specific default). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-02-09[PATCH] iscsi endianness annotationsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-01-06[SCSI] iscsi: simplify IPv6 and IPv4 address printingFUJITA Tomonori
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-01-06[SCSI] iscsi: fix crypto_alloc_hash() error checkAkinobu Mita
The return value of crypto_alloc_hash() should be checked by IS_ERR(). Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-01-06[SCSI] iscsi: fix 2.6.19 data digest calculation bugArne Redlich
The transition from crypto_digest_*() to the crypto_hash_*() family introduced a bug into the data digest calculation: crypto_hash_update() is called with the number of S/G elements instead of the S/G lists data size. Signed-off-by: Arne Redlich <arne.redlich@xiranet.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-11-10[SCSI] iscsi_tcp: fix xmittask oopsMike Christie
XMSTATE_SOL_HDR could be set when the xmit thread tests it, but there may not be anything on the r2tqueue yet. Move the XMSTATE_SOL_HDR set before the addition to the queue to make sure that when we pull something off it it is valid. This does not add locks around the xmstate test or make that a atmoic_t because this is a fast path and if it is set when we test it we can handle it there without the overhead. Later on we check the xmitqueue for all requests with the session lock so we will not miss it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-11-10[SCSI] iscsi: always release cryptoPete Wyckoff
Unconditionally free crypto state, as it is always allocated during TCP connection creation. Without this, crypto structures leak and crc32c module refcounts grow as connections are created and destroyed. Signed-off-by: Pete Wyckoff <pw@osc.edu> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-23Merge mulgrave-w:git/scsi-misc-2.6James Bottomley
Conflicts: drivers/scsi/iscsi_tcp.c drivers/scsi/iscsi_tcp.h Pretty horrible merge between crypto hash consolidation and crypto_digest_...->crypto_hash_... conversion Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-21[SCSI] iscsi: Use crypto_hash interface instead of crypto_digestHerbert Xu
This patch converts ISCSI to use the new crypto_hash interface instead of crypto_digest. It's a fairly straightforward substitution. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-02[SCSI] iscsi_tcp: fix partial digest recvMike Christie
When a digest is spread across two network buffers, we currently ignore this and try to check the digest with the partial buffer. Or course this fails. This patch has use iscsi_tcp_copy to copy the whole digest before testing it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] iscsi_tcp: update header size during reloginMike Christie
When we relogin to a target, we have not yet negotiated digests so we must reset the hdr_size var. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] iscsi_tcp: fix header resendMike Christie
This patch built over the last ones fixes a bug in the partial header resend code, where we add on another 4 bytes to the send length on the resend. We want just the header plus digest. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] scsi_tcp: rm data rx and tx tfmsMike Christie
We currently allocated seperate tfms for data and header digests. There is no reason for this since we can never calculate a rx header and digest at the same time. Same for sends. So this patch removes the data tfms and has the send and recv sides use the rx_tfm or tx_tfm. I also made the connection creation code preallocate the tfms because I thought I hit a bug where I changed the digests settings during a relogin but could not allocate the tfm and then we just failed. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] iscsi_tcp: fix padding, data digests, and IO at weird offsetsMike Christie
iscsi_tcp calculates padding by using the expected transfer length. This has the problem where if we have immediate data = no and initial R2T = yes, and the transfer length ended up needing padding then we send: 1. header 2. padding which should have gone after data 3. data Besides this bug, we also assume the target will always ask for nice transfer lengths and the first burst length will always be a nice value. As far as I can tell form the RFC this is not a requirement. It would be silly to do this, but if someone did it we will end doing bad things. Finally the last bug in that bit of code is in our handling of the recalculation of data digests when we do not send a whole iscsi_buf in one try. The bug here is that we call crypto_digest_final on a iscsi_sendpage error, then when we send the rest of the iscsi_buf, we doiscsi_data_digest_init and this causes the previous data digest to be lost. And to make matters worse, some of these bugs are replicated over and over and over again for immediate data, solicited data and unsolicited data. So the attached patch made over the iscsi git tree (see kernel.org/git for details) which I updated today to include the patches I said I merged, consolidates the sending of data, padding and digests and calculation of data digests and fixes the above bugs. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] attempt to complete r2t with data len greater than max burstMike Christie
A couple targets like string bean and MDS, send r2ts with a data len greater than the max burst we agreed to. We were being strict in our enforcing of the iscsi rfc in that code path, but there is no driver limitation that prevents us from fullfilling the request. To allow those targets to work we will ignore the max_burst length and send as much data as the target asks for assuming it has consciously decided to override its max burst length. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-09-02[SCSI] libiscsi, iscsi_tcp, iscsi_iser: check that burst lengths are valid.Mike Christie
iSCSI RFC states that the first burst length must be smaller than the max burst length. We currently assume targets will be good, but that may not be the case, so this patch adds a check. This patch also moves the unsol data out offset to the lib so the LLDs do not have to track it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: update and move version numberMike Christie
The version info is useful for iscsi tcp, iser and qla4xxx so move to transport class. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: pass errors from complete_pdu to callerMike Christie
Must pass ISCSI_ERR values from the recv path and propogate them upwards. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: reduce memory allocationsMike Christie
We currently try to allocate a max_recv_data_segment_length which can be very large (default is 64K), and common uses are up to 1MB. It is very very difficult to allocte this much contiguous memory and it turns out we never even use it. We really only need a couple of pages, so this patch has us allocates just what we know what we need today. Later if vendors start adding vendor specific data and we need to handle large buffers we can do this, but for the last 4 years we have not seen anyone do this or request it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: fix oops when iser is flushing ioMike Christie
When we enter recovery and flush the running commands we cannot freee the connection before flushing the commands. Some commands may have a reference to the connection that needs to be released before. iscsi_stop was forcing the term and suspend too early and was causing a oops in iser, so this patch removes those callbacks all together and allows the LLD to handle that detail. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: handle data rsp errorsMike Christie
if iscsi_data_rsp fails we must bail out. Since the pdu values like data length are invalid we cannot continue to process the data since it could over run buffers. This fixes a bug with cisco 5428s where that target is sending too much data. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: fix r2t handlingMike Christie
The iscsi tcp code can pluck multiple rt2s from the tasks's r2tqueue in the xmit code. This can result in the task being queued on the xmit queue but gettting completed at the same time. This patch fixes the above bug by making the fifo a list so we always remove the entry on the list del. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-28[SCSI] iscsi bugfixes: send correct error values to userspaceMike Christie
In the xmit patch we are sending a -EXXX value to iscsi_conn_failure which is causing userspace to get confused. We should be sending a ISCSI_ERR_* value that userspace understands. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-29[SCSI] iscsi: convert iscsi_tcp to new set/get param fnsMike Christie
Convert iscsi_tcp to new lib functions. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-05[SCSI] iscsi: update version to 1.0-595Mike Christie
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-05[SCSI] iscsi: fix writepsace raceMike Christie
We can race and misset the suspend bit if iscsi_write_space is called then iscsi_send returns with a failure indicating there is no space. To handle this this patch returns a error upwards allowing xmitworker to decide if we need to try and transmit again. For the no write space case xmitworker will not retry, and instead let iscsi_write_space queue it back up if needed (this relies on the work queue code to properly requeue us if needed). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-05[SCSI] iscsi: don't switch states when just cleaning upMike Christie
If recovery failed or we are in recovery only overwrite the state if we are going to terminate the session or if we logged back in. STOP_CONN_SUSPEND and conn_cnt are not used. We only support a single connection session ATM, so cleanup that code while we are working around it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-20[SCSI] iscsi: update versionMike Christie
update version Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-20[SCSI] iscsi: kill dtask mempoolsMike Christie
Discovered by steven@hayter.me.uk and patch by michaelc@cs.wisc.edu The dtask mempool is reserving 261120 items per session! Since we are now sending headers with sendmsg there is no reason for the mempool and that was causing us to us carzy amounts of mem. We can preallicate a header in the r2t and task struct and reuse them Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-20[SCSI] iscsi: dont use sendpage for iscsi headersMike Christie
From Zhen and ported by Mike: Don't use sendpage for the headers. sendpage for the pdu headers does not seem to have a performance impact, makes life harder for mutiple data pdus to be in flight and still trips up some network cards when it is from slab mem. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-10[SCSI] iscsi: dequeue all buffers from queueMike Christie
debugged by wrwhitehead@novell.com patch and analysis by fujita.tomonori@lab.ntt.co.jp Only tcp_read_sock and recv_actor (iscsi_tcp_data_recv for us) see desc.count. It is is used just for permitting tcp_read_sock to read the portion of data in the socket. When iscsi_tcp_data_recv sees a partial header, it sets desc.count. However, it is possible that the next skb (containing the rest of the header) still does not come. So I'm not sure that this scheme is completely correct. Ideally, we should use the exact length of the data in the socket for desc.count. However, it is not so simple (see SIOCINQ in tcp_ioctl). So I think that iscsi_tcp_data_recv can just stop playing with desc.count and tell tcp_read_sock to read the all skbs. As proposed already, if iscsi_tcp_data_ready sets desc.count to non-zero, tcp_read_sock does that. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-10[SCSI] iscsi: increment expstatsn during loginMike Christie
debugged by Ming and Rohan: The problem Ming and Rohan debugged was that during a normal session login, open-iscsi is not incrementing the exp_statsn counter. It was stuck at zero. From the RFC, it looks like if the login response PDU has a successful status then we should be incrementing that value. Also from the RFC, it looks like if when we drop a connection then reconnect, we should be using the exp_statsn from the old connection in the next relogin attempt. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-10[SCSI] iscsi: align printksOr Gerlitz
align printk output Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-10[SCSI] iscsi: add transport end point callbacksOr Gerlitz
add transport end point callbacks so iscsi drivers that cannot connect from userspace, like iscsi tcp, using sockets do not have to implement their own socket infrastructure. Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>