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From: Ciara Loftus <ciara.loftus@intel.com>
To: dev@dpdk.org
Cc: Ciara Loftus <ciara.loftus@intel.com>, stable@dpdk.org
Subject: [dpdk-dev] [PATCH] net/af_xdp: fix 32-bit build for older kernels
Date: Thu, 12 Nov 2020 16:35:15 +0000
Message-ID: <20201112163515.29463-1-ciara.loftus@intel.com> (raw)

'uint64_t' is used to hold pointers in multiple locations in the
copy-mode code (used for kernels before 5.4). For a 32-bit build
this assumption is wrong and results in build errors. This commit
replaces such instances of 'uint64_t' with 'uintptr_t'.

While the copy-mode code will now compile for 32-bit, the PMD is
not expected to work and will fail at initialisation due to some
limitations in the kernel that were subsequently removed in v5.4.
Add a note to the docs to flag this limitation.

Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Cc: stable@dpdk.org

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
 doc/guides/nics/af_xdp.rst          | 1 +
 drivers/net/af_xdp/rte_eth_af_xdp.c | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/doc/guides/nics/af_xdp.rst b/doc/guides/nics/af_xdp.rst
index 052e59a3ae..5ed24374f8 100644
--- a/doc/guides/nics/af_xdp.rst
+++ b/doc/guides/nics/af_xdp.rst
@@ -50,6 +50,7 @@ This is a Linux-specific PMD, thus the following prerequisites apply:
 *  For PMD zero copy, it requires kernel version later than v5.4-rc1;
 *  For shared_umem, it requires kernel version v5.10 or later and libbpf version
    v0.2.0 or later.
+*  For 32-bit OS, a kernel with version 5.4 or later is required.
 Set up an af_xdp interface
diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 4076ff797c..75ff1c00b2 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -349,7 +349,7 @@ af_xdp_rx_cp(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	for (i = 0; i < rcvd; i++) {
 		const struct xdp_desc *desc;
-		uint64_t addr;
+		uintptr_t addr;
 		uint32_t len;
 		void *pkt;
@@ -402,7 +402,7 @@ pull_umem_cq(struct xsk_umem_info *umem, int size, struct xsk_ring_cons *cq)
 	n = xsk_ring_cons__peek(cq, size, &idx_cq);
 	for (i = 0; i < n; i++) {
-		uint64_t addr;
+		uintptr_t addr;
 		addr = *xsk_ring_cons__comp_addr(cq, idx_cq++);
 		addr = xsk_umem__extract_addr(addr);
@@ -1005,7 +1005,7 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals,
 	char ring_name[RTE_RING_NAMESIZE];
 	char mz_name[RTE_MEMZONE_NAMESIZE];
 	int ret;
-	uint64_t i;
+	uintptr_t i;
 	umem = rte_zmalloc_socket("umem", sizeof(*umem), 0, rte_socket_id());
 	if (umem == NULL) {

             reply	other threads:[~2020-11-12 17:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12 16:35 Ciara Loftus [this message]
2020-11-13 13:00 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2020-11-16 14:24   ` Loftus, Ciara
2020-11-17 11:00     ` Ferruh Yigit
2020-11-17 14:07 ` [dpdk-dev] [PATCH v2] net/af_xdp: document 32-bit OS kernel requirement Ciara Loftus
2020-11-18 13:13   ` Ferruh Yigit

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