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5073842093
Currently, calls to nvmet_fc_rcv_fcp_req() always copied the FC-NVME cmd iu to a temporary buffer before returning, allowing the driver to immediately repost the buffer to the hardware. To address timing conditions on queue element structures vs async command reception, the nvmet_fc transport occasionally may need to hold on to the command iu buffer for a short period. In these cases, the nvmet_fc_rcv_fcp_req() will return a special return code (-EOVERFLOW). In these cases, the LLDD must delay until the new defer_rcv lldd callback is called before recycling the buffer back to the hw. This patch adds support for the new nvmet_fc transport defer_rcv callback and recognition of the new error code when passing commands to the transport. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <james.smart@broadcom.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*******************************************************************
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* This file is part of the Emulex Linux Device Driver for *
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* Fibre Channel Host Bus Adapters. *
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* Copyright (C) 2017 Broadcom. All Rights Reserved. The term *
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* “Broadcom” refers to Broadcom Limited and/or its subsidiaries. *
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* Copyright (C) 2004-2016 Emulex. All rights reserved. *
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* EMULEX and SLI are trademarks of Emulex. *
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* www.broadcom.com *
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* Portions Copyright (C) 2004-2005 Christoph Hellwig *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of version 2 of the GNU General *
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* Public License as published by the Free Software Foundation. *
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* This program is distributed in the hope that it will be useful. *
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* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND *
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* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE *
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* DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
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* TO BE LEGALLY INVALID. See the GNU General Public License for *
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* more details, a copy of which can be found in the file COPYING *
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* included with this package. *
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********************************************************************/
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#define LPFC_NVMET_DEFAULT_SEGS (64 + 1) /* 256K IOs */
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#define LPFC_NVMET_RQE_DEF_COUNT 512
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#define LPFC_NVMET_SUCCESS_LEN 12
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/* Used for NVME Target */
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struct lpfc_nvmet_tgtport {
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struct lpfc_hba *phba;
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struct completion tport_unreg_done;
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/* Stats counters - lpfc_nvmet_unsol_ls_buffer */
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atomic_t rcv_ls_req_in;
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atomic_t rcv_ls_req_out;
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atomic_t rcv_ls_req_drop;
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atomic_t xmt_ls_abort;
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atomic_t xmt_ls_abort_cmpl;
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/* Stats counters - lpfc_nvmet_xmt_ls_rsp */
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atomic_t xmt_ls_rsp;
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atomic_t xmt_ls_drop;
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/* Stats counters - lpfc_nvmet_xmt_ls_rsp_cmp */
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atomic_t xmt_ls_rsp_error;
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atomic_t xmt_ls_rsp_cmpl;
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/* Stats counters - lpfc_nvmet_unsol_fcp_buffer */
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atomic_t rcv_fcp_cmd_in;
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atomic_t rcv_fcp_cmd_out;
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atomic_t rcv_fcp_cmd_drop;
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atomic_t rcv_fcp_cmd_defer;
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atomic_t xmt_fcp_release;
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/* Stats counters - lpfc_nvmet_xmt_fcp_op */
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atomic_t xmt_fcp_drop;
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atomic_t xmt_fcp_read_rsp;
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atomic_t xmt_fcp_read;
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atomic_t xmt_fcp_write;
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atomic_t xmt_fcp_rsp;
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/* Stats counters - lpfc_nvmet_xmt_fcp_op_cmp */
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atomic_t xmt_fcp_rsp_cmpl;
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atomic_t xmt_fcp_rsp_error;
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atomic_t xmt_fcp_rsp_drop;
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/* Stats counters - lpfc_nvmet_xmt_fcp_abort */
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atomic_t xmt_fcp_abort;
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atomic_t xmt_fcp_abort_cmpl;
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atomic_t xmt_abort_sol;
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atomic_t xmt_abort_unsol;
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atomic_t xmt_abort_rsp;
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atomic_t xmt_abort_rsp_error;
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};
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struct lpfc_nvmet_rcv_ctx {
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union {
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struct nvmefc_tgt_ls_req ls_req;
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struct nvmefc_tgt_fcp_req fcp_req;
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} ctx;
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struct list_head list;
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struct lpfc_hba *phba;
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struct lpfc_iocbq *wqeq;
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struct lpfc_iocbq *abort_wqeq;
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dma_addr_t txrdy_phys;
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spinlock_t ctxlock; /* protect flag access */
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uint32_t *txrdy;
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uint32_t sid;
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uint32_t offset;
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uint16_t oxid;
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uint16_t size;
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uint16_t entry_cnt;
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uint16_t cpu;
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uint16_t state;
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/* States */
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#define LPFC_NVMET_STE_LS_RCV 1
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#define LPFC_NVMET_STE_LS_ABORT 2
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#define LPFC_NVMET_STE_LS_RSP 3
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#define LPFC_NVMET_STE_RCV 4
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#define LPFC_NVMET_STE_DATA 5
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#define LPFC_NVMET_STE_ABORT 6
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#define LPFC_NVMET_STE_DONE 7
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#define LPFC_NVMET_STE_FREE 0xff
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uint16_t flag;
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#define LPFC_NVMET_IO_INP 0x1 /* IO is in progress on exchange */
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#define LPFC_NVMET_ABORT_OP 0x2 /* Abort WQE issued on exchange */
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#define LPFC_NVMET_XBUSY 0x4 /* XB bit set on IO cmpl */
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#define LPFC_NVMET_CTX_RLS 0x8 /* ctx free requested */
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#define LPFC_NVMET_ABTS_RCV 0x10 /* ABTS received on exchange */
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struct rqb_dmabuf *rqb_buffer;
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struct lpfc_nvmet_ctxbuf *ctxbuf;
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#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
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uint64_t ts_isr_cmd;
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uint64_t ts_cmd_nvme;
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uint64_t ts_nvme_data;
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uint64_t ts_data_wqput;
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uint64_t ts_isr_data;
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uint64_t ts_data_nvme;
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uint64_t ts_nvme_status;
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uint64_t ts_status_wqput;
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uint64_t ts_isr_status;
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uint64_t ts_status_nvme;
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#endif
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};
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