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net: ipa: add support for inline checksum offload
Starting with IPA v4.5, IP payload checksum offload is implemented differently. Prior to v4.5, the IPA hardware appends an rmnet_map_dl_csum_trailer structure to each packet if checksum offload is enabled in the download direction (modem->AP). In the upload direction (AP->modem) a rmnet_map_ul_csum_header structure is prepended before each sent packet. Starting with IPA v4.5, checksum offload is implemented using a single new rmnet_map_v5_csum_header structure which sits between the QMAP header and the packet data. The same header structure is used in both directions. The new header contains a header type (CSUM_OFFLOAD); a checksum flag; and a flag indicating whether any other headers follow this one. The checksum flag indicates whether the hardware should compute (and insert) the checksum on a sent packet. On a received packet the checksum flag indicates whether the hardware confirms the checksum value in the payload is correct. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
fcd1a53064
commit
5567d4d9e7
2 changed files with 37 additions and 11 deletions
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@ -457,28 +457,34 @@ int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
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static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
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{
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u32 offset = IPA_REG_ENDP_INIT_CFG_N_OFFSET(endpoint->endpoint_id);
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enum ipa_cs_offload_en enabled;
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u32 val = 0;
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/* FRAG_OFFLOAD_EN is 0 */
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if (endpoint->data->checksum) {
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enum ipa_version version = endpoint->ipa->version;
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if (endpoint->toward_ipa) {
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u32 checksum_offset;
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val |= u32_encode_bits(IPA_CS_OFFLOAD_UL,
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CS_OFFLOAD_EN_FMASK);
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/* Checksum header offset is in 4-byte units */
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checksum_offset = sizeof(struct rmnet_map_header);
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checksum_offset /= sizeof(u32);
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val |= u32_encode_bits(checksum_offset,
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CS_METADATA_HDR_OFFSET_FMASK);
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enabled = version < IPA_VERSION_4_5
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? IPA_CS_OFFLOAD_UL
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: IPA_CS_OFFLOAD_INLINE;
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} else {
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val |= u32_encode_bits(IPA_CS_OFFLOAD_DL,
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CS_OFFLOAD_EN_FMASK);
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enabled = version < IPA_VERSION_4_5
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? IPA_CS_OFFLOAD_DL
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: IPA_CS_OFFLOAD_INLINE;
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}
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} else {
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val |= u32_encode_bits(IPA_CS_OFFLOAD_NONE,
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CS_OFFLOAD_EN_FMASK);
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enabled = IPA_CS_OFFLOAD_NONE;
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}
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val |= u32_encode_bits(enabled, CS_OFFLOAD_EN_FMASK);
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/* CS_GEN_QMB_MASTER_SEL is 0 */
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iowrite32(val, endpoint->ipa->reg_virt + offset);
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@ -498,6 +504,27 @@ static void ipa_endpoint_init_nat(struct ipa_endpoint *endpoint)
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iowrite32(val, endpoint->ipa->reg_virt + offset);
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}
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static u32
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ipa_qmap_header_size(enum ipa_version version, struct ipa_endpoint *endpoint)
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{
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u32 header_size = sizeof(struct rmnet_map_header);
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/* Without checksum offload, we just have the MAP header */
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if (!endpoint->data->checksum)
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return header_size;
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if (version < IPA_VERSION_4_5) {
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/* Checksum header inserted for AP TX endpoints only */
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if (endpoint->toward_ipa)
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header_size += sizeof(struct rmnet_map_ul_csum_header);
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} else {
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/* Checksum header is used in both directions */
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header_size += sizeof(struct rmnet_map_v5_csum_header);
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}
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return header_size;
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}
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/**
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* ipa_endpoint_init_hdr() - Initialize HDR endpoint configuration register
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* @endpoint: Endpoint pointer
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@ -526,13 +553,11 @@ static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
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u32 val = 0;
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if (endpoint->data->qmap) {
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size_t header_size = sizeof(struct rmnet_map_header);
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enum ipa_version version = ipa->version;
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size_t header_size;
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/* We might supply a checksum header after the QMAP header */
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if (endpoint->toward_ipa && endpoint->data->checksum)
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header_size += sizeof(struct rmnet_map_ul_csum_header);
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val |= ipa_header_size_encoded(version, header_size);
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header_size = ipa_qmap_header_size(version, endpoint);
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val = ipa_header_size_encoded(version, header_size);
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/* Define how to fill fields in a received QMAP header */
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if (!endpoint->toward_ipa) {
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@ -368,6 +368,7 @@ enum ipa_cs_offload_en {
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IPA_CS_OFFLOAD_NONE = 0x0,
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IPA_CS_OFFLOAD_UL = 0x1, /* Before IPA v4.5 (TX) */
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IPA_CS_OFFLOAD_DL = 0x2, /* Before IPA v4.5 (RX) */
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IPA_CS_OFFLOAD_INLINE = 0x1, /* IPA v4.5 (TX and RX) */
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};
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/* Valid only for TX (IPA consumer) endpoints */
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