IB/srp: Patches for 2.6.37

This series of five patches adds SRP_CRED_REQ and SRP_AER_REQ support in ib_srp, implements a small performance optimization and introduces the macro list_first_entry().

Changes in v7 compared to v6:
- Restored a test in __srp_get_tx_iu() that had been left out accidentally from v6.
- Renamed three constants added by this patch series to ib_srp.h.
- Removed the unary address-of operator (ampersand) from before function names because in that case it is superfluous.

Changes in v6 compared to v5:
- Changed the title of this patch series to reflect better the purpose of the patch series.
- Merged the functions __srp_post_send_iu(), __srp_post_send_req() and __srp_post_send_rsp() back into a single function called __srp_post_send().
- Split the patch that adds SRP_CRED_REQ support again in two patches: one with the new functionality and one that rearranges the function definition order.
- Response processing: avoided a double switch on the response opcode.
- Renamed some of the newly introduced constants and datatypes.
- Updated patch descriptions and source code comments.

Changes in v5 compared to v4:
- Added support for processing the SRP_AER_REQ information unit.
- Introduced a new symbolic name, SRP_NORMAL_REQ_SQ_SIZE, that represents the maximum number of requests that may be queued by the SCSI mid-layer.
- Changed transmit ring overflow check back to that of v3 (removed "- rsv" again).
- Reduced the size of the srp_target_port.req_ring array by one element such that its size again matches the maximum number of requests that can be queued by the SCSI mid-layer.
- Moved BUILD_BUG_ON_NOT_POWER_OF_2() statements to the module initialization function.
- Updated patch descriptions.

Changes in v4 compared to v3:
- Dropped the fourth patch since it has been merged.
- Introduced the symbolic constant SRP_TSK_MGMT_RSV, which represents the number of slots reserved in the tx ring for SRP task management requests.
- One slot of the transmit ring buffer is now reserved for sending SRP_TSK_MGMT requests.
- The BUILD_BUG_ON_NOT_POWER_OF_2() macro is now used to verify whether SRP_RQ_MASK and SRP_SQ_MASK really are bitmasks.
- Rearranged function order such that no new forward declarations have to be introduced in the second patch.
- Eliminated the srp_target_port.tx_req and tx_rsp variables.
- Removed the SRP_OP_RSP flag.
- Added a source code comment that explains why can_queue must be less than req_lim.

Changes in v3 compared to v2:
- Corrected completion queue size from SRP_REQ_SQ_SIZE (63) into SRP_SQ_SIZE (64).
- Merged the two functions __srp_get_tx_req_iu() and __srp_get_tx_rsp_iu() into a single function __srp_get_tx_iu().
- Removed __attribute__((packed)) from the structure definitions added in include/scsi/srp.h because it was superfluous.
- Modified descriptions of patches 1/4, 2/4 and 3/4.

Changes in v2 compared to v1:
- Split the big patch into multiple patches, which makes reviewing easier.
- Instead of defining separate queues for transmitting requests and responses, a single queue is now used.
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