Date: Mon, 1 Feb 2016 08:43:00 +0000 From: "sepherosa_gmail.com (Sepherosa Ziehau)" <phabric-noreply@FreeBSD.org> To: freebsd-net@freebsd.org Subject: [Differential] [Request, 31 lines] D5159: hyperv/hn: Recover half of the chimney sending space Message-ID: <differential-rev-PHID-DREV-ilfipff27tzltswcpxdp-req@FreeBSD.org>
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[-- Attachment #1 --] sepherosa_gmail.com created this revision. sepherosa_gmail.com added reviewers: network, adrian, delphij, royger, decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com. sepherosa_gmail.com added a subscriber: freebsd-net-list. REVISION SUMMARY Due to the miss use of ffs, where ffsl should be used. And use system atomic operation instead. While I'm here, strigent chimney sending index assertion. REVISION DETAIL https://reviews.freebsd.org/D5159 AFFECTED FILES sys/dev/hyperv/netvsc/hv_net_vsc.c CHANGE DETAILS diff --git a/sys/dev/hyperv/netvsc/hv_net_vsc.c b/sys/dev/hyperv/netvsc/hv_net_vsc.c --- a/sys/dev/hyperv/netvsc/hv_net_vsc.c +++ b/sys/dev/hyperv/netvsc/hv_net_vsc.c @@ -136,15 +136,15 @@ int i; for (i = 0; i < bitsmap_words; i++) { - idx = ffs(~bitsmap[i]); + idx = ffsl(~bitsmap[i]); if (0 == idx) continue; idx--; - if (i * BITS_PER_LONG + idx >= net_dev->send_section_count) - return (ret); + KASSERT(i * BITS_PER_LONG + idx < net_dev->send_section_count, + ("invalid i %d and idx %lu", i, idx)); - if (synch_test_and_set_bit(idx, &bitsmap[i])) + if (atomic_testandset_long(&bitsmap[i], idx)) continue; ret = i * BITS_PER_LONG + idx; @@ -789,8 +789,27 @@ if (NULL != net_vsc_pkt) { if (net_vsc_pkt->send_buf_section_idx != NVSP_1_CHIMNEY_SEND_INVALID_SECTION_INDEX) { - synch_change_bit(net_vsc_pkt->send_buf_section_idx, - net_dev->send_section_bitsmap); + u_long mask; + int idx; + + idx = net_vsc_pkt->send_buf_section_idx / + BITS_PER_LONG; + KASSERT(idx < net_dev->bitsmap_words, + ("invalid section index %u", + net_vsc_pkt->send_buf_section_idx)); + mask = 1UL << + (net_vsc_pkt->send_buf_section_idx % + BITS_PER_LONG); + + KASSERT(net_dev->send_section_bitsmap[idx] & + mask, + ("index bitmap 0x%lx, section index %u, " + "bitmap idx %d, bitmask 0x%lx", + net_dev->send_section_bitsmap[idx], + net_vsc_pkt->send_buf_section_idx, + idx, mask)); + atomic_clear_long( + &net_dev->send_section_bitsmap[idx], mask); } /* Notify the layer above us */ EMAIL PREFERENCES https://reviews.freebsd.org/settings/panel/emailpreferences/ To: sepherosa_gmail.com, network, adrian, delphij, royger, decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com Cc: freebsd-net-list [-- Attachment #2 --] diff --git a/sys/dev/hyperv/netvsc/hv_net_vsc.c b/sys/dev/hyperv/netvsc/hv_net_vsc.c --- a/sys/dev/hyperv/netvsc/hv_net_vsc.c +++ b/sys/dev/hyperv/netvsc/hv_net_vsc.c @@ -136,15 +136,15 @@ int i; for (i = 0; i < bitsmap_words; i++) { - idx = ffs(~bitsmap[i]); + idx = ffsl(~bitsmap[i]); if (0 == idx) continue; idx--; - if (i * BITS_PER_LONG + idx >= net_dev->send_section_count) - return (ret); + KASSERT(i * BITS_PER_LONG + idx < net_dev->send_section_count, + ("invalid i %d and idx %lu", i, idx)); - if (synch_test_and_set_bit(idx, &bitsmap[i])) + if (atomic_testandset_long(&bitsmap[i], idx)) continue; ret = i * BITS_PER_LONG + idx; @@ -789,8 +789,27 @@ if (NULL != net_vsc_pkt) { if (net_vsc_pkt->send_buf_section_idx != NVSP_1_CHIMNEY_SEND_INVALID_SECTION_INDEX) { - synch_change_bit(net_vsc_pkt->send_buf_section_idx, - net_dev->send_section_bitsmap); + u_long mask; + int idx; + + idx = net_vsc_pkt->send_buf_section_idx / + BITS_PER_LONG; + KASSERT(idx < net_dev->bitsmap_words, + ("invalid section index %u", + net_vsc_pkt->send_buf_section_idx)); + mask = 1UL << + (net_vsc_pkt->send_buf_section_idx % + BITS_PER_LONG); + + KASSERT(net_dev->send_section_bitsmap[idx] & + mask, + ("index bitmap 0x%lx, section index %u, " + "bitmap idx %d, bitmask 0x%lx", + net_dev->send_section_bitsmap[idx], + net_vsc_pkt->send_buf_section_idx, + idx, mask)); + atomic_clear_long( + &net_dev->send_section_bitsmap[idx], mask); } /* Notify the layer above us */
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