Date: Tue, 15 Oct 2024 17:43:14 GMT From: Osama Abboud <osamaabb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: f236e544a2ff - main - ena: Properly unmap last socket chain in netmap Message-ID: <202410151743.49FHhEMf062444@gitrepo.freebsd.org>
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The branch main has been updated by osamaabb: URL: https://cgit.FreeBSD.org/src/commit/?id=f236e544a2ff685ae151f3232e3785a6a9aab035 commit f236e544a2ff685ae151f3232e3785a6a9aab035 Author: Osama Abboud <osamaabb@amazon.com> AuthorDate: 2024-08-07 06:24:20 +0000 Commit: Osama Abboud <osamaabb@FreeBSD.org> CommitDate: 2024-10-15 17:38:32 +0000 ena: Properly unmap last socket chain in netmap In case ena_com_prepare_tx() fails within the netmap tx flow, the driver will unmap the last socket chain. Currently, the driver unmaps the wrong socket within ena_netmap_unmap_last_socket_chain(). Illustration of the flow: 1- ena_netmap_tx_frames() 2- ena_netmap_tx_frame() 3- ena_netmap_tx_map_slots() 3.1- Map slot 3.2- Advance to the next socket 4- ena_com_prepare_tx() 4.1- ena_com_prepare_tx() fails 5- ena_netmap_unmap_last_socket_chain() In step 5, where the driver unmaps the socket, the netmap index already points at the next entry, meaning we're unmapping the wrong socket in case ena_com_prepare_tx() fails. In order to fix that, the driver should first update the netmap index to point at the previous entry and only then update the socket parameters. Approved by: cperciva (mentor) MFC after: 2 weeks Sponsored by: Amazon, Inc. --- sys/dev/ena/ena_netmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/dev/ena/ena_netmap.c b/sys/dev/ena/ena_netmap.c index 0666d7deb827..f14a4a9539d1 100644 --- a/sys/dev/ena/ena_netmap.c +++ b/sys/dev/ena/ena_netmap.c @@ -783,10 +783,10 @@ ena_netmap_unmap_last_socket_chain(struct ena_netmap_ctx *ctx, /* Next, retain the sockets back to the userspace */ n = nm_info->sockets_used; while (n--) { + ctx->nm_i = nm_prev(ctx->nm_i, ctx->lim); ctx->slots[ctx->nm_i].buf_idx = nm_info->socket_buf_idx[n]; ctx->slots[ctx->nm_i].flags = NS_BUF_CHANGED; nm_info->socket_buf_idx[n] = 0; - ctx->nm_i = nm_prev(ctx->nm_i, ctx->lim); } nm_info->sockets_used = 0; }
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