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Tsirkin" , Andrew Melnychenko , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 1/5] hw/net: fix typo s/epbf/ebpf/ in virtio-net Date: Tue, 6 Aug 2024 15:56:49 +0100 Message-ID: <20240806145653.1632478-2-berrange@redhat.com> In-Reply-To: <20240806145653.1632478-1-berrange@redhat.com> References: <20240806145653.1632478-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1722956248983116600 Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/net/virtio-net.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 08aa0b65e3..e5ff3e4b18 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1253,7 +1253,7 @@ static void rss_data_to_rss_config(struct VirtioNetRs= sData *data, config->default_queue =3D data->default_queue; } =20 -static bool virtio_net_attach_epbf_rss(VirtIONet *n) +static bool virtio_net_attach_ebpf_rss(VirtIONet *n) { struct EBPFRSSConfig config =3D {}; =20 @@ -1275,7 +1275,7 @@ static bool virtio_net_attach_epbf_rss(VirtIONet *n) return true; } =20 -static void virtio_net_detach_epbf_rss(VirtIONet *n) +static void virtio_net_detach_ebpf_rss(VirtIONet *n) { virtio_net_attach_ebpf_to_backend(n->nic, -1); } @@ -1285,8 +1285,8 @@ static void virtio_net_commit_rss_config(VirtIONet *n) if (n->rss_data.enabled) { n->rss_data.enabled_software_rss =3D n->rss_data.populate_hash; if (n->rss_data.populate_hash) { - virtio_net_detach_epbf_rss(n); - } else if (!virtio_net_attach_epbf_rss(n)) { + virtio_net_detach_ebpf_rss(n); + } else if (!virtio_net_attach_ebpf_rss(n)) { if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { warn_report("Can't load eBPF RSS for vhost"); } else { @@ -1299,7 +1299,7 @@ static void virtio_net_commit_rss_config(VirtIONet *n) n->rss_data.indirections_len, sizeof(n->rss_data.key)); } else { - virtio_net_detach_epbf_rss(n); + virtio_net_detach_ebpf_rss(n); trace_virtio_net_rss_disable(); } } --=20 2.45.2 From nobody Sun Nov 24 11:26:19 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1722956269; cv=none; d=zohomail.com; s=zohoarc; b=b53ucrHJWhbAwr7Bp3+YXoFoeW40CFA+ZzLYhv9sqn6hzj/43+nEa3Aw3tMR8f7xh1zjoPWGzp2TcyIbTRjhZee7QFD08E1P7JXEjmxVHRwrbSFREucaT5KCBK7tznzW8YjIKM72Ym5zEUQtNfOMNnjd0mEqgpAXrdx2KChzZtY= ARC-Message-Signature: i=1; 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Tsirkin" , Andrew Melnychenko , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 2/5] ebpf: drop redundant parameter checks in static methods Date: Tue, 6 Aug 2024 15:56:50 +0100 Message-ID: <20240806145653.1632478-3-berrange@redhat.com> In-Reply-To: <20240806145653.1632478-1-berrange@redhat.com> References: <20240806145653.1632478-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1722956271044116600 Various static methods have checks on their parameters which were already checked immediately before the method was invoked. Drop these redundat checks to simplify the following commit which adds formal error reporting. Signed-off-by: Daniel P. Berrang=C3=A9 --- ebpf/ebpf_rss.c | 32 +++++--------------------------- 1 file changed, 5 insertions(+), 27 deletions(-) diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c index 87f0714910..aa7170d997 100644 --- a/ebpf/ebpf_rss.c +++ b/ebpf/ebpf_rss.c @@ -49,10 +49,6 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx) =20 static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx) { - if (!ebpf_rss_is_loaded(ctx)) { - return false; - } - ctx->mmap_configuration =3D mmap(NULL, qemu_real_host_page_size(), PROT_READ | PROT_WRITE, MAP_SHARED, ctx->map_configuration, 0); @@ -90,10 +86,6 @@ toeplitz_fail: =20 static void ebpf_rss_munmap(struct EBPFRSSContext *ctx) { - if (!ebpf_rss_is_loaded(ctx)) { - return; - } - munmap(ctx->mmap_indirections_table, qemu_real_host_page_size()); munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size()); munmap(ctx->mmap_configuration, qemu_real_host_page_size()); @@ -177,15 +169,10 @@ bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, in= t program_fd, return true; } =20 -static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx, +static void ebpf_rss_set_config(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config) { - if (!ebpf_rss_is_loaded(ctx)) { - return false; - } - memcpy(ctx->mmap_configuration, config, sizeof(*config)); - return true; } =20 static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx, @@ -194,8 +181,7 @@ static bool ebpf_rss_set_indirections_table(struct EBPF= RSSContext *ctx, { char *cursor =3D ctx->mmap_indirections_table; =20 - if (!ebpf_rss_is_loaded(ctx) || indirections_table =3D=3D NULL || - len > VIRTIO_NET_RSS_MAX_TABLE_LEN) { + if (len > VIRTIO_NET_RSS_MAX_TABLE_LEN) { return false; } =20 @@ -207,20 +193,16 @@ static bool ebpf_rss_set_indirections_table(struct EB= PFRSSContext *ctx, return true; } =20 -static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx, +static void ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx, uint8_t *toeplitz_key) { /* prepare toeplitz key */ uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] =3D {}; =20 - if (!ebpf_rss_is_loaded(ctx) || toeplitz_key =3D=3D NULL) { - return false; - } memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE); *(uint32_t *)toe =3D ntohl(*(uint32_t *)toe); =20 memcpy(ctx->mmap_toeplitz_key, toe, VIRTIO_NET_RSS_MAX_KEY_SIZE); - return true; } =20 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *co= nfig, @@ -231,18 +213,14 @@ bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, str= uct EBPFRSSConfig *config, return false; } =20 - if (!ebpf_rss_set_config(ctx, config)) { - return false; - } + ebpf_rss_set_config(ctx, config); =20 if (!ebpf_rss_set_indirections_table(ctx, indirections_table, config->indirections_len)) { return false; } =20 - if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) { - return false; - } + ebpf_rss_set_toepliz_key(ctx, toeplitz_key); =20 return true; } --=20 2.45.2 From nobody Sun Nov 24 11:26:19 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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bh=RUi9yPpVhDKJVqS1jbz+1v3fh7CZn/19xyVHONyffD4=; b=gNUOTg86ULCGnw/3iyZfAY5p5Ch07wKyc1NbyM4whPxUCUFhugh8pl1cuo+kavAYsiM6D/ IKqlgs/P1MOngo3QkvRfzFfiV6DfshVW3yCkPgKbj8/Cz4wIe+tANYc5qOvPPrLPSL84Aa YxF9uTnY7WgbBA8KJyKo10aMfWVlWmI= X-MC-Unique: 4skmm43XME2z5qyevgiNSw-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Jason Wang , Yuri Benditovich , "Michael S. Tsirkin" , Andrew Melnychenko , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 3/5] ebpf: add formal error reporting to all APIs Date: Tue, 6 Aug 2024 15:56:51 +0100 Message-ID: <20240806145653.1632478-4-berrange@redhat.com> In-Reply-To: <20240806145653.1632478-1-berrange@redhat.com> References: <20240806145653.1632478-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1722956293162116600 The eBPF code is currently reporting error messages through trace events. Trace events are fine for debugging, but they are not to be considered the primary error reporting mechanism, as their output is inaccessible to callers. This adds an "Error **errp" parameter to all methods which have important error scenarios to report to the caller. Signed-off-by: Daniel P. Berrang=C3=A9 --- ebpf/ebpf_rss.c | 59 ++++++++++++++++++++++++++++++++++++--------- ebpf/ebpf_rss.h | 10 +++++--- hw/net/virtio-net.c | 7 +++--- 3 files changed, 59 insertions(+), 17 deletions(-) diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c index aa7170d997..59854c8b51 100644 --- a/ebpf/ebpf_rss.c +++ b/ebpf/ebpf_rss.c @@ -47,13 +47,14 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx) return ctx !=3D NULL && (ctx->obj !=3D NULL || ctx->program_fd !=3D -1= ); } =20 -static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx) +static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx, Error **errp) { ctx->mmap_configuration =3D mmap(NULL, qemu_real_host_page_size(), PROT_READ | PROT_WRITE, MAP_SHARED, ctx->map_configuration, 0); if (ctx->mmap_configuration =3D=3D MAP_FAILED) { trace_ebpf_error("eBPF RSS", "can not mmap eBPF configuration arra= y"); + error_setg(errp, "Unable to map eBPF configuration array"); return false; } ctx->mmap_toeplitz_key =3D mmap(NULL, qemu_real_host_page_size(), @@ -61,6 +62,7 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx) ctx->map_toeplitz_key, 0); if (ctx->mmap_toeplitz_key =3D=3D MAP_FAILED) { trace_ebpf_error("eBPF RSS", "can not mmap eBPF toeplitz key"); + error_setg(errp, "Unable to map eBPF toeplitz array"); goto toeplitz_fail; } ctx->mmap_indirections_table =3D mmap(NULL, qemu_real_host_page_size(), @@ -68,6 +70,7 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx) ctx->map_indirections_table, 0); if (ctx->mmap_indirections_table =3D=3D MAP_FAILED) { trace_ebpf_error("eBPF RSS", "can not mmap eBPF indirection table"= ); + error_setg(errp, "Unable to map eBPF indirection array"); goto indirection_fail; } =20 @@ -95,7 +98,7 @@ static void ebpf_rss_munmap(struct EBPFRSSContext *ctx) ctx->mmap_indirections_table =3D NULL; } =20 -bool ebpf_rss_load(struct EBPFRSSContext *ctx) +bool ebpf_rss_load(struct EBPFRSSContext *ctx, Error **errp) { struct rss_bpf *rss_bpf_ctx; =20 @@ -106,6 +109,7 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx) rss_bpf_ctx =3D rss_bpf__open(); if (rss_bpf_ctx =3D=3D NULL) { trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object"); + error_setg(errp, "Unable to open eBPF RSS object"); goto error; } =20 @@ -113,6 +117,7 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx) =20 if (rss_bpf__load(rss_bpf_ctx)) { trace_ebpf_error("eBPF RSS", "can not load RSS program"); + error_setg(errp, "Unable to load eBPF program"); goto error; } =20 @@ -126,7 +131,7 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx) ctx->map_toeplitz_key =3D bpf_map__fd( rss_bpf_ctx->maps.tap_rss_map_toeplitz_key); =20 - if (!ebpf_rss_mmap(ctx)) { + if (!ebpf_rss_mmap(ctx, errp)) { goto error; } =20 @@ -143,13 +148,28 @@ error: } =20 bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd, - int config_fd, int toeplitz_fd, int table_fd) + int config_fd, int toeplitz_fd, int table_fd, + Error **errp) { if (ebpf_rss_is_loaded(ctx)) { + error_setg(errp, "eBPF program is already loaded"); return false; } =20 - if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0= ) { + if (program_fd < 0) { + error_setg(errp, "eBPF program FD is not open"); + return false; + } + if (config_fd < 0) { + error_setg(errp, "eBPF config FD is not open"); + return false; + } + if (toeplitz_fd < 0) { + error_setg(errp, "eBPF toeplitz FD is not open"); + return false; + } + if (table_fd < 0) { + error_setg(errp, "eBPF indirection FD is not open"); return false; } =20 @@ -158,7 +178,7 @@ bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int = program_fd, ctx->map_toeplitz_key =3D toeplitz_fd; ctx->map_indirections_table =3D table_fd; =20 - if (!ebpf_rss_mmap(ctx)) { + if (!ebpf_rss_mmap(ctx, errp)) { ctx->program_fd =3D -1; ctx->map_configuration =3D -1; ctx->map_toeplitz_key =3D -1; @@ -177,11 +197,14 @@ static void ebpf_rss_set_config(struct EBPFRSSContext= *ctx, =20 static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx, uint16_t *indirections_table, - size_t len) + size_t len, + Error **errp) { char *cursor =3D ctx->mmap_indirections_table; =20 if (len > VIRTIO_NET_RSS_MAX_TABLE_LEN) { + error_setg(errp, "Indirections table length %zu exceeds limit %d", + len, VIRTIO_NET_RSS_MAX_TABLE_LEN); return false; } =20 @@ -206,17 +229,31 @@ static void ebpf_rss_set_toepliz_key(struct EBPFRSSCo= ntext *ctx, } =20 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *co= nfig, - uint16_t *indirections_table, uint8_t *toeplitz_key) + uint16_t *indirections_table, uint8_t *toeplitz_key, + Error **errp) { - if (!ebpf_rss_is_loaded(ctx) || config =3D=3D NULL || - indirections_table =3D=3D NULL || toeplitz_key =3D=3D NULL) { + if (!ebpf_rss_is_loaded(ctx)) { + error_setg(errp, "eBPF program is not loaded"); + return false; + } + if (config =3D=3D NULL) { + error_setg(errp, "eBPF config table is NULL"); + return false; + } + if (indirections_table =3D=3D NULL) { + error_setg(errp, "eBPF indirections table is NULL"); + return false; + } + if (toeplitz_key =3D=3D NULL) { + error_setg(errp, "eBPF toeplitz key is NULL"); return false; } =20 ebpf_rss_set_config(ctx, config); =20 if (!ebpf_rss_set_indirections_table(ctx, indirections_table, - config->indirections_len)) { + config->indirections_len, + errp)) { return false; } =20 diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h index 239242b0d2..86a5787789 100644 --- a/ebpf/ebpf_rss.h +++ b/ebpf/ebpf_rss.h @@ -14,6 +14,8 @@ #ifndef QEMU_EBPF_RSS_H #define QEMU_EBPF_RSS_H =20 +#include "qapi/error.h" + #define EBPF_RSS_MAX_FDS 4 =20 struct EBPFRSSContext { @@ -41,13 +43,15 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx); =20 bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx); =20 -bool ebpf_rss_load(struct EBPFRSSContext *ctx); +bool ebpf_rss_load(struct EBPFRSSContext *ctx, Error **errp); =20 bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd, - int config_fd, int toeplitz_fd, int table_fd); + int config_fd, int toeplitz_fd, int table_fd, + Error **errp); =20 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *co= nfig, - uint16_t *indirections_table, uint8_t *toeplitz_key); + uint16_t *indirections_table, uint8_t *toeplitz_key, + Error **errp); =20 void ebpf_rss_unload(struct EBPFRSSContext *ctx); =20 diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index e5ff3e4b18..85323322ea 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1264,7 +1264,8 @@ static bool virtio_net_attach_ebpf_rss(VirtIONet *n) rss_data_to_rss_config(&n->rss_data, &config); =20 if (!ebpf_rss_set_all(&n->ebpf_rss, &config, - n->rss_data.indirections_table, n->rss_data.key)= ) { + n->rss_data.indirections_table, n->rss_data.key, + NULL)) { return false; } =20 @@ -1335,7 +1336,7 @@ static bool virtio_net_load_ebpf_fds(VirtIONet *n) } } =20 - ret =3D ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]= ); + ret =3D ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]= , NULL); =20 exit: if (!ret) { @@ -1353,7 +1354,7 @@ static bool virtio_net_load_ebpf(VirtIONet *n) =20 if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) { if (!(n->ebpf_rss_fds && virtio_net_load_ebpf_fds(n))) { - ret =3D ebpf_rss_load(&n->ebpf_rss); + ret =3D ebpf_rss_load(&n->ebpf_rss, NULL); } } =20 --=20 2.45.2 From nobody Sun Nov 24 11:26:19 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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bh=9ZaMrzQ/FCMzS6IV9NFuh3edTIO49KNcTeKHAheYESk=; b=c6AGoZV2iJRRDt8fo+3tlsy9PvxFlgDq0DgNWzlkV85+Dx1adIiQLlDeqoaEvjqs5dJobV qoLowwTcor/CMJjBvN6QD38mphkyTEUhCl8BW5MCMZ/8PSVEHES7zj4UcrHfZv43Sd030H CM1XWfgV8BqxKuxfYWC109fGd7jKR58= X-MC-Unique: meqAoqOuPT2-yJzBkrpjbw-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Jason Wang , Yuri Benditovich , "Michael S. Tsirkin" , Andrew Melnychenko , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 4/5] hw/net: report errors from failing to use eBPF RSS FDs Date: Tue, 6 Aug 2024 15:56:52 +0100 Message-ID: <20240806145653.1632478-5-berrange@redhat.com> In-Reply-To: <20240806145653.1632478-1-berrange@redhat.com> References: <20240806145653.1632478-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1722956255230116600 If the user/mgmt app passed in a set of pre-opened FDs for eBPF RSS, then it is expecting QEMU to use them. Any failure to do so must be considered a fatal error and propagated back up the stack, otherwise deployment mistakes will not be detectable in a prompt manner. When not using pre-opened FDs, then eBPF RSS is tried on a "best effort" basis only and thus fallback to software RSS is valid. Signed-off-by: Daniel P. Berrang=C3=A9 --- hw/net/virtio-net.c | 40 ++++++++++++++++++++++++++++------------ 1 file changed, 28 insertions(+), 12 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 85323322ea..cfcf3e1f1a 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1315,28 +1315,27 @@ static void virtio_net_disable_rss(VirtIONet *n) virtio_net_commit_rss_config(n); } =20 -static bool virtio_net_load_ebpf_fds(VirtIONet *n) +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp) { int fds[EBPF_RSS_MAX_FDS] =3D { [0 ... EBPF_RSS_MAX_FDS - 1] =3D -1}; int ret =3D true; int i =3D 0; =20 if (n->nr_ebpf_rss_fds !=3D EBPF_RSS_MAX_FDS) { - warn_report("Expected %d file descriptors but got %d", - EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds); - return false; - } + error_setg(errp, "Expected %d file descriptors but got %d", + EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds); + return false; + } =20 for (i =3D 0; i < n->nr_ebpf_rss_fds; i++) { - fds[i] =3D monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], - &error_warn); + fds[i] =3D monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], err= p); if (fds[i] < 0) { ret =3D false; goto exit; } } =20 - ret =3D ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]= , NULL); + ret =3D ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]= , errp); =20 exit: if (!ret) { @@ -1348,13 +1347,15 @@ exit: return ret; } =20 -static bool virtio_net_load_ebpf(VirtIONet *n) +static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp) { bool ret =3D false; =20 if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) { - if (!(n->ebpf_rss_fds && virtio_net_load_ebpf_fds(n))) { - ret =3D ebpf_rss_load(&n->ebpf_rss, NULL); + if (n->ebpf_rss_fds) { + ret =3D virtio_net_load_ebpf_fds(n, errp); + } else { + ret =3D ebpf_rss_load(&n->ebpf_rss, errp); } } =20 @@ -3760,7 +3761,22 @@ static void virtio_net_device_realize(DeviceState *d= ev, Error **errp) net_rx_pkt_init(&n->rx_pkt); =20 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { - virtio_net_load_ebpf(n); + Error *err =3D NULL; + if (!virtio_net_load_ebpf(n, &err)) { + /* + * If user explicitly gave QEMU RSS FDs to use, then + * failing to use them must be considered a fatal + * error. If no RSS FDs were provided, QEMU is trying + * eBPF on a "best effort" basis only, so report a + * warning and allow fallback to software RSS. + */ + if (n->ebpf_rss_fds) { + error_propagate(errp, err); + } else { + warn_report("unable to load eBPF RSS: %s", error_get_prett= y(err)); + error_free(err); + } + } } } =20 --=20 2.45.2 From nobody Sun Nov 24 11:26:19 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1722956254; cv=none; d=zohomail.com; s=zohoarc; b=PWxs6Ws06Vo85HgmL71EQmINQljkt3S03EfNrMzmuI08hYwFL+NSI5ZNyzUNS2vIME5hlni7C641DgdAp5PbvC6WXpOugf1T0lHw/g7no+BCrssA0+NUzvWnRQx/rs+8dRr0GIvJT1ezEN9fiaJ63P31OgofNWmpMTk5NPq0tdg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1722956254; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=C4dymvc2MOazeFcHCfl7ctCRCuRvQ1KhpacdSK9eASs=; b=MmQOxnecioLYTWQFA06XGsaVPS6wp1utZ+cUtGApRcg3Eqf6wimh2fPpD9gf007115+1Tx0XT97WbugOcEXtt0naEsWqGcDRO9cG0yIFm2ixB8JikqIc9wJ4RnhXVUFETa9FX+17nWKwxCxlUbK43ZpdC5re4odoMv1vMfHv50Y= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 17229562549024.875469810972504; Tue, 6 Aug 2024 07:57:34 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sbLcn-0001vo-1T; Tue, 06 Aug 2024 10:57:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sbLcl-0001nu-2H for qemu-devel@nongnu.org; Tue, 06 Aug 2024 10:57:19 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sbLci-0001xt-Ju for qemu-devel@nongnu.org; Tue, 06 Aug 2024 10:57:18 -0400 Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-15-AAV6wXJmOnCpweQBOdcjQw-1; Tue, 06 Aug 2024 10:57:13 -0400 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 30D3E1955D4E; Tue, 6 Aug 2024 14:57:12 +0000 (UTC) Received: from toolbox.redhat.com (unknown [10.42.28.106]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A9C1019560AE; Tue, 6 Aug 2024 14:57:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722956235; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C4dymvc2MOazeFcHCfl7ctCRCuRvQ1KhpacdSK9eASs=; b=Vc59GZjFgKV7tcJ12o+U03j4/DHY52vBjd5aw3h3blNz6UOJqTgDtvUnyABi9O1pfFlYI4 TtlV8GVQba/5yP3jszWf+jY2gl3rG5Q6bc7R3d9oImGRmqUQjHGpH9WZb9aQuKe/O2XYV5 xetR6DBMlLk6UO/Jq0TwIoxOoSKQcNc= X-MC-Unique: AAV6wXJmOnCpweQBOdcjQw-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Jason Wang , Yuri Benditovich , "Michael S. Tsirkin" , Andrew Melnychenko , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 5/5] ebpf: improve trace event coverage to all key operations Date: Tue, 6 Aug 2024 15:56:53 +0100 Message-ID: <20240806145653.1632478-6-berrange@redhat.com> In-Reply-To: <20240806145653.1632478-1-berrange@redhat.com> References: <20240806145653.1632478-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1722956257037116600 The existing error trace event is renamed to have a name prefix matching its source file & to remove the redundant first arg that adds no useful information. Signed-off-by: Daniel P. Berrang=C3=A9 --- ebpf/ebpf_rss.c | 29 ++++++++++++++++++++++++----- ebpf/trace-events | 6 +++++- 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c index 59854c8b51..8c42953475 100644 --- a/ebpf/ebpf_rss.c +++ b/ebpf/ebpf_rss.c @@ -53,7 +53,7 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx, Err= or **errp) PROT_READ | PROT_WRITE, MAP_SHARED, ctx->map_configuration, 0); if (ctx->mmap_configuration =3D=3D MAP_FAILED) { - trace_ebpf_error("eBPF RSS", "can not mmap eBPF configuration arra= y"); + trace_ebpf_rss_error(ctx, "can not mmap eBPF configuration array"); error_setg(errp, "Unable to map eBPF configuration array"); return false; } @@ -61,7 +61,7 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx, Err= or **errp) PROT_READ | PROT_WRITE, MAP_SHARED, ctx->map_toeplitz_key, 0); if (ctx->mmap_toeplitz_key =3D=3D MAP_FAILED) { - trace_ebpf_error("eBPF RSS", "can not mmap eBPF toeplitz key"); + trace_ebpf_rss_error(ctx, "can not mmap eBPF toeplitz key"); error_setg(errp, "Unable to map eBPF toeplitz array"); goto toeplitz_fail; } @@ -69,11 +69,15 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx, E= rror **errp) PROT_READ | PROT_WRITE, MAP_SHARED, ctx->map_indirections_table, 0); if (ctx->mmap_indirections_table =3D=3D MAP_FAILED) { - trace_ebpf_error("eBPF RSS", "can not mmap eBPF indirection table"= ); + trace_ebpf_rss_error(ctx, "can not mmap eBPF indirection table"); error_setg(errp, "Unable to map eBPF indirection array"); goto indirection_fail; } =20 + trace_ebpf_rss_mmap(ctx, + ctx->mmap_configuration, + ctx->mmap_toeplitz_key, + ctx->mmap_indirections_table); return true; =20 indirection_fail: @@ -108,7 +112,7 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx, Error **= errp) =20 rss_bpf_ctx =3D rss_bpf__open(); if (rss_bpf_ctx =3D=3D NULL) { - trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object"); + trace_ebpf_rss_error(ctx, "can not open eBPF RSS object"); error_setg(errp, "Unable to open eBPF RSS object"); goto error; } @@ -116,7 +120,7 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx, Error **= errp) bpf_program__set_type(rss_bpf_ctx->progs.tun_rss_steering_prog, BPF_PR= OG_TYPE_SOCKET_FILTER); =20 if (rss_bpf__load(rss_bpf_ctx)) { - trace_ebpf_error("eBPF RSS", "can not load RSS program"); + trace_ebpf_rss_error(ctx, "can not load RSS program"); error_setg(errp, "Unable to load eBPF program"); goto error; } @@ -131,6 +135,11 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx, Error *= *errp) ctx->map_toeplitz_key =3D bpf_map__fd( rss_bpf_ctx->maps.tap_rss_map_toeplitz_key); =20 + trace_ebpf_rss_load(ctx, + ctx->program_fd, + ctx->map_configuration, + ctx->map_indirections_table, + ctx->map_toeplitz_key); if (!ebpf_rss_mmap(ctx, errp)) { goto error; } @@ -178,6 +187,12 @@ bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int= program_fd, ctx->map_toeplitz_key =3D toeplitz_fd; ctx->map_indirections_table =3D table_fd; =20 + trace_ebpf_rss_load(ctx, + ctx->program_fd, + ctx->map_configuration, + ctx->map_indirections_table, + ctx->map_toeplitz_key); + if (!ebpf_rss_mmap(ctx, errp)) { ctx->program_fd =3D -1; ctx->map_configuration =3D -1; @@ -259,6 +274,8 @@ bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struc= t EBPFRSSConfig *config, =20 ebpf_rss_set_toepliz_key(ctx, toeplitz_key); =20 + trace_ebpf_rss_set_data(ctx, config, indirections_table, toeplitz_key); + return true; } =20 @@ -268,6 +285,8 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx) return; } =20 + trace_ebpf_rss_unload(ctx); + ebpf_rss_munmap(ctx); =20 if (ctx->obj) { diff --git a/ebpf/trace-events b/ebpf/trace-events index b3ad1a35f2..0202abd905 100644 --- a/ebpf/trace-events +++ b/ebpf/trace-events @@ -1,4 +1,8 @@ # See docs/devel/tracing.rst for syntax documentation. =20 # ebpf-rss.c -ebpf_error(const char *s1, const char *s2) "error in %s: %s" +ebpf_rss_error(void *ctx, const char *s) "ctx=3D%p error=3D%s" +ebpf_rss_load(void *ctx, int progfd, int cfgfd, int toepfd, int indirfd) "= ctx=3D%p program-fd=3D%d config-fd=3D%d toeplitz-fd=3D%d indirection-fd=3D%= d" +ebpf_rss_mmap(void *ctx, void *cfgptr, void *toepptr, void *indirptr) "ctx= =3D%p config-ptr=3D%p toeplitz-ptr=3D%p indirection-ptr=3D%p" +ebpf_rss_unload(void *ctx) "rss unload ctx=3D%p" +ebpf_rss_set_data(void *ctx, void *cfgptr, void *toepptr, void *indirptr) = "ctx=3D%p config-ptr=3D%p toeplitz-ptr=3D%p indirection-ptr=3D%p" --=20 2.45.2