From be8b981453a4904399cb090c1660618e250092d8 Mon Sep 17 00:00:00 2001 From: David Dillow Date: Tue, 18 Jan 2011 21:58:09 -0500 Subject: [PATCH] IB/srp: try to use larger FMR sizes to cover our mappings Now that we can get larger SG lists, we can take advantage of HCAs that allow us to use larger FMR sizes. In many cases, we can use up to 512 entries, so start there and work our way down. Signed-off-by: David Dillow --- drivers/infiniband/ulp/srp/ib_srp.c | 31 ++++++++++++++++++----------- drivers/infiniband/ulp/srp/ib_srp.h | 3 ++- 2 files changed, 21 insertions(+), 13 deletions(-) diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 4ec7dddbbf49..376d640487d2 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -2300,7 +2300,7 @@ static void srp_add_one(struct ib_device *device) struct ib_device_attr *dev_attr; struct ib_fmr_pool_param fmr_param; struct srp_host *host; - int fmr_page_shift, s, e, p; + int max_pages_per_fmr, fmr_page_shift, s, e, p; dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); if (!dev_attr) @@ -2340,17 +2340,24 @@ static void srp_add_one(struct ib_device *device) if (IS_ERR(srp_dev->mr)) goto err_pd; - memset(&fmr_param, 0, sizeof fmr_param); - fmr_param.pool_size = SRP_FMR_POOL_SIZE; - fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; - fmr_param.cache = 1; - fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; - fmr_param.page_shift = fmr_page_shift; - fmr_param.access = (IB_ACCESS_LOCAL_WRITE | - IB_ACCESS_REMOTE_WRITE | - IB_ACCESS_REMOTE_READ); - - srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); + for (max_pages_per_fmr = SRP_FMR_SIZE; + max_pages_per_fmr >= SRP_FMR_MIN_SIZE; + max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) { + memset(&fmr_param, 0, sizeof fmr_param); + fmr_param.pool_size = SRP_FMR_POOL_SIZE; + fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; + fmr_param.cache = 1; + fmr_param.max_pages_per_fmr = max_pages_per_fmr; + fmr_param.page_shift = fmr_page_shift; + fmr_param.access = (IB_ACCESS_LOCAL_WRITE | + IB_ACCESS_REMOTE_WRITE | + IB_ACCESS_REMOTE_READ); + + srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); + if (!IS_ERR(srp_dev->fmr_pool)) + break; + } + if (IS_ERR(srp_dev->fmr_pool)) srp_dev->fmr_pool = NULL; diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index cf696218eeeb..020caf0c3789 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -69,7 +69,8 @@ enum { SRP_TAG_NO_REQ = ~0U, SRP_TAG_TSK_MGMT = 1U << 31, - SRP_FMR_SIZE = 256, + SRP_FMR_SIZE = 512, + SRP_FMR_MIN_SIZE = 128, SRP_FMR_POOL_SIZE = 1024, SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4, -- 2.34.1