From: Ishai Rabinovitz Date: Thu, 3 Aug 2006 17:35:43 +0000 (-0700) Subject: IB/srp: Work around data corruption bug on Mellanox targets X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=559ce8f150d7d031c79c4d79173860f1bdfe3ce4;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git IB/srp: Work around data corruption bug on Mellanox targets Data corruption has been seen with Mellanox SRP targets when FMRs create a memory region with I/O virtual address != 0. Add a workaround that disables FMR merging for Mellanox targets (OUI 0002c9). Signed-off-by: Ishai Rabinovitz Signed-off-by: Michael S. Tsirkin Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index ff94e4e32691..8257d5a2c8f8 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -77,6 +77,14 @@ MODULE_PARM_DESC(topspin_workarounds, static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; +static int mellanox_workarounds = 1; + +module_param(mellanox_workarounds, int, 0444); +MODULE_PARM_DESC(mellanox_workarounds, + "Enable workarounds for Mellanox SRP target bugs if != 0"); + +static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 }; + static void srp_add_one(struct ib_device *device); static void srp_remove_one(struct ib_device *device); static void srp_completion(struct ib_cq *cq, void *target_ptr); @@ -569,7 +577,7 @@ err: return ret; } -static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat, +static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, int sg_cnt, struct srp_request *req, struct srp_direct_buf *buf) { @@ -579,10 +587,15 @@ static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat, int page_cnt; int i, j; int ret; + struct srp_device *dev = target->srp_host->dev; if (!dev->fmr_pool) return -ENODEV; + if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) && + mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3)) + return -EINVAL; + len = page_cnt = 0; for (i = 0; i < sg_cnt; ++i) { if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) { @@ -685,7 +698,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, buf->va = cpu_to_be64(sg_dma_address(scat)); buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey); buf->len = cpu_to_be32(sg_dma_len(scat)); - } else if (srp_map_fmr(target->srp_host->dev, scat, count, req, + } else if (srp_map_fmr(target, scat, count, req, (void *) cmd->add_data)) { /* * FMR mapping failed, and the scatterlist has more