4.14-stable review patch. If anyone has any objections, please let me know.
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From: Srikanth Jampala Jampala.Srikanth@cavium.com
[ Upstream commit 3d7c82060d1fe65bde4023aac41a0b1bd7718e07 ]
Earlier used to post the current command without checking queue full after backlog submissions. So, post the current command only after confirming the space in queue after backlog submissions.
Maintain host write index instead of reading device registers to get the next free slot to post the command.
Return -ENOSPC in queue full case.
Signed-off-by: Srikanth Jampala Jampala.Srikanth@cavium.com Reviewed-by: Gadam Sreerama sgadam@cavium.com Tested-by: Jha, Chandan Chandan.Jha@cavium.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/crypto/cavium/nitrox/nitrox_dev.h | 3 - drivers/crypto/cavium/nitrox/nitrox_lib.c | 1 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c | 57 +++++++++++++++------------ 3 files changed, 35 insertions(+), 26 deletions(-)
--- a/drivers/crypto/cavium/nitrox/nitrox_dev.h +++ b/drivers/crypto/cavium/nitrox/nitrox_dev.h @@ -35,6 +35,7 @@ struct nitrox_cmdq { /* requests in backlog queues */ atomic_t backlog_count;
+ int write_idx; /* command size 32B/64B */ u8 instr_size; u8 qno; @@ -87,7 +88,7 @@ struct nitrox_bh { struct bh_data *slc; };
-/* NITROX-5 driver state */ +/* NITROX-V driver state */ #define NITROX_UCODE_LOADED 0 #define NITROX_READY 1
--- a/drivers/crypto/cavium/nitrox/nitrox_lib.c +++ b/drivers/crypto/cavium/nitrox/nitrox_lib.c @@ -36,6 +36,7 @@ static int cmdq_common_init(struct nitro cmdq->head = PTR_ALIGN(cmdq->head_unaligned, PKT_IN_ALIGN); cmdq->dma = PTR_ALIGN(cmdq->dma_unaligned, PKT_IN_ALIGN); cmdq->qsize = (qsize + PKT_IN_ALIGN); + cmdq->write_idx = 0;
spin_lock_init(&cmdq->response_lock); spin_lock_init(&cmdq->cmdq_lock); --- a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c +++ b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c @@ -43,6 +43,16 @@ * Invalid flag options in AES-CCM IV. */
+static inline int incr_index(int index, int count, int max) +{ + if ((index + count) >= max) + index = index + count - max; + else + index += count; + + return index; +} + /** * dma_free_sglist - unmap and free the sg lists. * @ndev: N5 device @@ -427,30 +437,29 @@ static void post_se_instr(struct nitrox_ struct nitrox_cmdq *cmdq) { struct nitrox_device *ndev = sr->ndev; - union nps_pkt_in_instr_baoff_dbell pkt_in_baoff_dbell; - u64 offset; + int idx; u8 *ent;
spin_lock_bh(&cmdq->cmdq_lock);
- /* get the next write offset */ - offset = NPS_PKT_IN_INSTR_BAOFF_DBELLX(cmdq->qno); - pkt_in_baoff_dbell.value = nitrox_read_csr(ndev, offset); + idx = cmdq->write_idx; /* copy the instruction */ - ent = cmdq->head + pkt_in_baoff_dbell.s.aoff; + ent = cmdq->head + (idx * cmdq->instr_size); memcpy(ent, &sr->instr, cmdq->instr_size); - /* flush the command queue updates */ - dma_wmb();
- sr->tstamp = jiffies; atomic_set(&sr->status, REQ_POSTED); response_list_add(sr, cmdq); + sr->tstamp = jiffies; + /* flush the command queue updates */ + dma_wmb();
/* Ring doorbell with count 1 */ writeq(1, cmdq->dbell_csr_addr); /* orders the doorbell rings */ mmiowb();
+ cmdq->write_idx = incr_index(idx, 1, ndev->qlen); + spin_unlock_bh(&cmdq->cmdq_lock); }
@@ -460,6 +469,9 @@ static int post_backlog_cmds(struct nitr struct nitrox_softreq *sr, *tmp; int ret = 0;
+ if (!atomic_read(&cmdq->backlog_count)) + return 0; + spin_lock_bh(&cmdq->backlog_lock);
list_for_each_entry_safe(sr, tmp, &cmdq->backlog_head, backlog) { @@ -467,7 +479,7 @@ static int post_backlog_cmds(struct nitr
/* submit until space available */ if (unlikely(cmdq_full(cmdq, ndev->qlen))) { - ret = -EBUSY; + ret = -ENOSPC; break; } /* delete from backlog list */ @@ -492,23 +504,20 @@ static int nitrox_enqueue_request(struct { struct nitrox_cmdq *cmdq = sr->cmdq; struct nitrox_device *ndev = sr->ndev; - int ret = -EBUSY; + + /* try to post backlog requests */ + post_backlog_cmds(cmdq);
if (unlikely(cmdq_full(cmdq, ndev->qlen))) { if (!(sr->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) - return -EAGAIN; - + return -ENOSPC; + /* add to backlog list */ backlog_list_add(sr, cmdq); - } else { - ret = post_backlog_cmds(cmdq); - if (ret) { - backlog_list_add(sr, cmdq); - return ret; - } - post_se_instr(sr, cmdq); - ret = -EINPROGRESS; + return -EBUSY; } - return ret; + post_se_instr(sr, cmdq); + + return -EINPROGRESS; }
/** @@ -625,11 +634,9 @@ int nitrox_process_se_request(struct nit */ sr->instr.fdata[0] = *((u64 *)&req->gph); sr->instr.fdata[1] = 0; - /* flush the soft_req changes before posting the cmd */ - wmb();
ret = nitrox_enqueue_request(sr); - if (ret == -EAGAIN) + if (ret == -ENOSPC) goto send_fail;
return ret;