Date: Fri, 9 Feb 2018 03:07:13 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r329057 - stable/11/sys/dev/ntb Message-ID: <201802090307.w1937DVm040187@repo.freebsd.org>
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Author: mav Date: Fri Feb 9 03:07:12 2018 New Revision: 329057 URL: https://svnweb.freebsd.org/changeset/base/329057 Log: MFC r328611: Try to preallocate receive memory early. We may not have enough contiguous memory later, when NTB connection get established. It is quite likely that NTB windows are symmetric and this allocation remain, but even if not, we will just reallocate it later. Modified: stable/11/sys/dev/ntb/ntb_transport.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/ntb/ntb_transport.c ============================================================================== --- stable/11/sys/dev/ntb/ntb_transport.c Fri Feb 9 03:06:45 2018 (r329056) +++ stable/11/sys/dev/ntb/ntb_transport.c Fri Feb 9 03:07:12 2018 (r329057) @@ -332,7 +332,7 @@ ntb_transport_attach(device_t dev) struct ntb_transport_child **cpp = &nt->child; struct ntb_transport_child *nc; struct ntb_transport_mw *mw; - uint64_t db_bitmap; + uint64_t db_bitmap, size; int rc, i, db_count, spad_count, qp, qpu, qpo, qpt; char cfg[128] = ""; char buf[32]; @@ -383,6 +383,17 @@ ntb_transport_attach(device_t dev) rc = ntb_mw_set_wc(dev, i, VM_MEMATTR_WRITE_COMBINING); if (rc) ntb_printf(0, "Unable to set mw%d caching\n", i); + + /* + * Try to preallocate receive memory early, since there may + * be not enough contiguous memory later. It is quite likely + * that NTB windows are symmetric and this allocation remain, + * but even if not, we will just reallocate it later. + */ + size = mw->phys_size; + if (max_mw_size != 0 && size > max_mw_size) + size = max_mw_size; + ntb_set_mw(nt, i, size); } qpu = 0;
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