5d5fbe79c1
In order to match NetBSD-style imports of external code, the library has been restructured. The full lwIP source tree is imported, except for a few .git* files in its root directory, into dist/. The MINIX 3 Makefiles and other custom files are located in lib/. Finally, since we need to apply a number of small patches to lwIP, these patches are stored in patches/, in addition to being applied to the lwIP tree. The currently imported version of lwIP is taken from its master branch sometime after the 2.0.1 release, specifically git-7ffe5bf. Change-Id: Ie03c4fa36fa928870263c191205d6d93f652a3cc
41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From 3ec7c31a2e5fba79936ca97de3e527f851e34c6b Mon Sep 17 00:00:00 2001
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From: David van Moolenbroek <david@minix3.org>
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Date: Thu, 2 Feb 2017 18:58:11 +0000
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Subject: [PATCH 4/4] MINIX 3 only: avoid large contiguous allocations
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On MINIX 3, we implement our own pool-based memory management. The
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maximum buffer size of any one of those pool elements is small: 512
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bytes, currently. That means that any allocation for larger
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contiguous sizes will never succeed. This patch deals with one known
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practical case where this is a problem, namely duplication of incoming
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UDP packets that should be delivered to more than one UDP PCB. This
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case can be resolved by using our own pbuf chain allocator.
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The only remaining currently known case where lwIP performs large
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contiguous allocations, is in allocating the reply buffer for ICMP
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ping requests. The result is that our implementation will never
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respond to ping requests that exceed 512 bytes, which is just fine.
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---
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src/core/udp.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/src/core/udp.c b/src/core/udp.c
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index ec4b25f..f53fb66 100644
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--- a/src/core/udp.c
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+++ b/src/core/udp.c
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@@ -368,7 +368,11 @@ udp_input(struct pbuf *p, struct netif *inp)
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pbuf_header_force(p, hdrs_len);
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p_header_changed = 1;
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}
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+#if defined(__minix)
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+ q = pchain_alloc(PBUF_RAW, p->tot_len);
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+#else /* !defined(__minix) */
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q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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+#endif /* !defined(__minix) */
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if (q != NULL) {
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err_t err = pbuf_copy(q, p);
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if (err == ERR_OK) {
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--
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2.5.2
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